CN112722049B

CN112722049B - Foldable joint and foldable frame

Info

Publication number: CN112722049B
Application number: CN202110174452.1A
Authority: CN
Inventors: 陈贯一
Original assignee: Fujian Rongzhong Renfa Children Products Co ltd
Current assignee: Fujian Rongzhong Renfa Children Products Co ltd
Priority date: 2021-02-07
Filing date: 2021-02-07
Publication date: 2024-08-06
Anticipated expiration: 2041-02-07
Also published as: CN112722049A

Abstract

The application relates to a foldable joint and a foldable frame. Each connecting pipe of the foldable joint can be coaxially hinged through the corresponding control connecting part, the first connecting part or the second connecting part, the hinge structure is simple, an external linkage structure is not needed, and the production efficiency can be effectively improved; when the device is operated, the second rotating piece and the first rotating piece can be sequentially rotated to realize folding or unfolding by controlling the control mechanism and even the control connecting part, and the operation process is simple and rapid; the second pin shaft can improve the rotation stability between the second rotation mechanism and the control mechanism; meanwhile, the foldable joints are adopted, so that the front foot pipe, the rear foot pipe and the handle connecting pipe of the foldable frame can be folded or unfolded rapidly, the structure is simple, the potential safety hazard is small, and the folding and unfolding of the foldable bicycle frame can be realized through the handle connecting rod.

Description

Foldable joint and foldable frame

Technical Field

The application relates to a foldable joint and a foldable frame.

Background

The support structure is often formed by connecting a plurality of connecting pipes, such as a frame, a storage basket frame, a table and chair support, a storage rack and the like. In order to facilitate storage and reduce occupied space, the connecting pipes of the bracket structure are connected in a hinged mode, so that the bracket structure can be folded and folded. When the connecting pipes are folded, the user rotates the connecting pipes, so that the connecting pipes are close to each other as much as possible and are folded; when the support is unfolded, the user manually and sequentially operates the connecting pipes, so that the connecting pipes are relatively rotated and separated, and the support structure is in a use state. At present, a linkage structure is often installed between each connecting pipe of the support structure, and is used for improving the folding or unfolding efficiency of the support structure.

With respect to the related art, the inventor considers that the linkage structure is connected with each connecting pipe, and the formed bracket structure is complex and tedious, and the production process is troublesome and time-consuming.

Disclosure of Invention

In order to simplify the linkage structure of each connecting pipe and improve the production efficiency, the application provides a foldable joint and a foldable frame.

In a first aspect, the present application provides a foldable joint, which adopts the following technical scheme:

A foldable joint comprises a joint pin shaft, an operating mechanism, a first rotating mechanism and a second rotating mechanism; the joint pin shaft is arranged in the control mechanism, the first rotating mechanism and the second rotating mechanism in a penetrating mode, and the first rotating mechanism and the second rotating mechanism can rotate around the joint pin shaft;

The control mechanism is provided with a control groove staggered with the joint pin shaft, the control groove is provided with a first pin shaft parallel to the joint pin shaft, and the control mechanism is used for driving the first pin shaft to rotate around the joint pin shaft; the control mechanism is provided with a control connecting part;

The first rotating mechanism is provided with a first track groove for the first pin shaft to slide around the joint pin shaft; the motion track of the first pin roll, which slides from one end to the other end of the first track groove around the joint pin roll, is an arc, and the arc is a first arc; the first rotating mechanism is provided with a first connecting part;

The second rotating mechanism is provided with a second track groove for the first pin shaft to slide around the joint pin shaft; the motion track of the first pin roll, which slides from one end to the other end of the second track groove around the joint pin roll, is an arc, and the arc is a second arc; the second rotating mechanism is provided with a second connecting part;

the first arc is greater than the second arc.

By adopting the technical scheme; when the connecting device is used, the control connecting part, the first connecting part and the second connecting part can be used for connecting different connecting pipes. Because the first track groove and the second track groove are coaxially arranged, and the first radian is larger than the second radian, when the control mechanism drives the first pin shaft to rotate around the joint pin shaft along one end of the first track groove and one end of the second track groove towards the other end, the first pin shaft is propped against the other end of the second track groove; then the first pin shaft pushes the other end of the second track groove to drive the second rotating mechanism to continue rotating along with the control mechanism until the first pin shaft abuts against the other end of the first track groove; therefore, the control mechanism drives the control mechanism, the first rotating mechanism and the second rotating mechanism to rotate in the same direction, so that the control connecting part, the first connecting part and the second connecting part mutually form at least two different position relations, and the control of the position change of the connecting part, the first connecting part and the second connecting part, such as relative folding or relative unfolding, is realized.

And the control connecting part can independently rotate a second radian relative to the second connecting part along with the control mechanism at least, and the position of the first connecting part relative to the second connecting part is not influenced.

The foldable joint has the advantages that the whole structure is simple, different connecting pipes can be hinged coaxially through corresponding control connecting parts, first connecting parts or second connecting parts, the hinge structure is simple, an external linkage structure is not needed, and the production efficiency is effectively improved. And when in use and operation, the second rotating piece and the first rotating piece can be sequentially rotated by controlling the control mechanism and even the control connecting part, so that the control mechanism, the first rotating mechanism and the second rotating mechanism can be folded or unfolded, and the operation process is simple and rapid.

Optionally, the second rotating mechanism is provided with a second pin shaft which is staggered with the second track groove, and the second pin shaft is parallel to the joint pin shaft;

the first rotating mechanism is provided with a first extending track groove for the second pin shaft to slide around the joint pin shaft; the second pin roll slides to the movement track of the other end from one end of the first extending track groove around the joint pin roll to form an arc, and the arc is a first extending arc; the first extension radian is not greater than the radian difference between the first radian and the second radian.

By adopting the technical scheme, the first rotating mechanism and the second rotating mechanism rotate around the joint pin shaft through the second pin shaft and the second extending track groove, and the rotating angle of the first connecting part and the second connecting part which are relatively unfolded or relatively folded is limited. If the second connecting part is unfolded relative to the first connecting part, the second pin shaft is propped against one end of the first extending track groove; when the second connecting part is folded relative to the first connecting part, the second pin shaft is propped against the other end of the first extending track groove. And when the first connecting part and the second connecting part are unfolded relatively, the second pin shaft can also prop against one side of the first extending track groove far away from the first folding end, so that the first rotating mechanism is limited to rotate, and the unfolded support structure can be stabilized.

Optionally, the control groove extends along the radial direction of the joint pin shaft to form a strip-shaped groove; the control connecting part is close to the control groove;

The first extending track groove and the first track groove are staggered along the radial direction of the shutdown pin shaft; the first extending track groove is communicated, one end of the first extending track groove is propped against one end of the first track groove, and the other end of the first extending track groove extends towards the other end of the first track groove; the first connecting part is close to one end of the first track groove, which is propped against the first extending track groove;

One end of the second track groove extends along the radial direction of the joint pin shaft to form a clamping groove matched with the outer diameter of the first pin shaft, and the clamping groove is used for limiting the first pin shaft to slide along the second track groove; when the second rotating mechanism moves to the position that the first pin shaft abuts against the clamping groove, the first pin shaft just moves from the first track groove to the first extending track groove, and the control groove moves from one end to the other end; the second connecting part is close to the clamping groove.

By adopting the technical scheme, the control mechanism can drive the first pin shaft to move along the control groove, control the first pin shaft to move between the first track groove and the first extending track groove, or drive the first pin shaft to move between the second track groove and the clamping groove, thereby improving the control mechanism to drive the first pin shaft, so that the second rotating mechanism, the second pin shaft and the first rotating mechanism move or rotate along with the first pin shaft, the relative positions of the control connecting part, the first connecting part and the second connecting part are changed, and the control connecting part, the first connecting part and the second connecting part are unfolded or folded relatively.

Further, the unfolding operation of the control mechanism, the first rotating mechanism and the second rotating mechanism can be performed as follows: the first pin shaft is controlled by the control mechanism to penetrate through the first extending track groove or the clamping groove, the first pin shaft slides from one end of the first track groove, which is close to the first connecting part, to the other end of the first track groove, and the second connecting part rotates along with the first pin shaft, so that the first connecting part and the second connecting part can be relatively unfolded, and at the moment, one end of the first track groove, which is far away from the first connecting part, and one end of the second track groove, which is far away from the second connecting part, coaxially correspond to each other; and then the control mechanism drives the first pin shaft to be separated from the clamping groove and the first extending track groove, enter the first track groove and the second track groove, slide along the first track groove and the second track groove until the second pin shaft abuts against one end of the first track groove far away from the first connecting part and one end of the second track groove far away from the second connecting part, namely the control connecting part, the first connecting part and the second connecting part are respectively and relatively unfolded.

Optionally, a guide surface for the first pin to move from the first extending track groove to the first track groove is provided at one end of the first extending track groove away from the first connecting portion.

By adopting the technical scheme, the first pin shaft can automatically move from the first extending track groove to the first track groove along the sliding inertia of the first extending track groove through the guide surface, and the first pin shaft slides from one end of the control groove to the other end, and the external force controls the first pin shaft to apply force and drive along the length direction of the control groove; and simultaneously, the first pin shaft is separated from the clamping groove and enters the second track groove.

Optionally, a first limiting hole corresponding to and matched with the control slot extends from one end of the first track slot away from the first connecting part; one end of the second track groove far away from the clamping groove extends to form a second limiting hole correspondingly matched with the control groove

By adopting the technical scheme, when the first rotating mechanism, the second rotating mechanism and the control mechanism rotate to the unfolding state, the first pin shaft is positioned at the control groove, the first limiting hole and the second limiting hole at the same time; the structure of the unfolding state of the foldable joint is stable.

Optionally, the width of the control groove gradually decreases from one end of the first pin shaft, which is driven to slide around the first track groove, to the other end of the first pin shaft.

Through adopting above-mentioned technical scheme, the slot width of controlling the groove can improve the steadiness that first round pin axle is connected with controlling the groove, reduces to receive and close the joint under the expansion state and use rocking, improves the steadiness.

Optionally, the control mechanism includes a moving member and a rotating member; the control connecting part is fixed on the rotating piece; the control groove is positioned on the rotating piece; one end of the first pin shaft penetrates through the control groove and is connected to the moving piece; the movable piece is provided with a movable waist hole for the joint pin shaft to move along the length direction of the control groove; the length of the movable waist hole is matched with the length of the control groove.

By adopting the technical scheme, the telescopic piece between the moving piece and the rotating piece can drive the first pin shaft to normally prop against one end of the control groove, so that the step of controlling the first pin shaft to move along the control groove in the folding or unfolding process is reduced, and an operator can conveniently confirm that the rotating piece or the moving piece drives the first pin shaft to move in place.

Optionally, the control mechanism is provided with a control track groove for the second pin shaft to slide around the joint pin shaft; the control track groove is staggered with the control groove; the first track groove and the first extending track groove are through grooves, the control track groove and the control groove are through grooves or the second track groove is a through groove.

By adopting the technical scheme, the control track groove is connected with the second pin shaft, so that the connection stability of the control mechanism and the first rotating mechanism or the second rotating mechanism can be improved, and the control mechanism can drive the second rotating mechanism to rotate around the joint pin shaft more stably. And according to the use requirement, the sequence that the control mechanism, the first rotating mechanism and the second rotating mechanism penetrate through the joint pin shafts can be controlled, and the parts of the mechanism in the middle penetrating through the first pin shafts and the second pin shafts are through grooves.

Optionally, the device also comprises a plug mechanism penetrating through the joint pin shaft; the plug is positioned at one side of the control mechanism; and at least one of the control mechanism, the first rotating mechanism or the second rotating mechanism is provided with a limiting component for limiting the rotation of the plug mechanism.

By adopting the technical scheme, the plug mechanism can be connected with other connecting pipes, and the rotation range of the plug mechanism is controlled by utilizing the limiting component and the reversing rotation hole.

Optionally, the plug mechanism is provided with a reversing rotation hole for the limiting assembly to rotate around the joint pin shaft; the limiting assembly comprises a first limiting piece and a second limiting piece, and the first limiting piece and the second limiting piece are respectively arranged in the reversing rotating hole in a penetrating mode; the maximum radian formed by the rotation of the first limiting piece and the second limiting piece around the joint pin shaft is not greater than the reversing rotation hole.

Through adopting above-mentioned technical scheme, spacing subassembly can restrict the rotation scope of plug mechanism relative joint round pin axle, makes it both can adjust rotation angle as required, can keep the stability of angle after rotating again, improves safety in utilization. After the plug mechanism rotates and adjusts, at least one of the first limiting piece and the second limiting piece is propped against one end of the reversing rotating hole, so that the reversing rotating hole is limited to rotate, and the use safety is influenced.

In a second aspect, the present application provides a foldable frame, which adopts the following technical scheme:

A foldable frame comprises two groups of side frames; each side frame comprises a front foot pipe, a rear foot pipe, a handle connecting pipe and the foldable joint; the foldable joint is used for hinging the front foot tube, the rear foot tube and the handle connecting tube; the front foot tube and the rear foot tube are connected with the first connecting part and the second connecting part; the handle connecting pipe is connected with the control connecting part.

Through adopting above-mentioned technical scheme, adopt collapsible joint, make preceding foot pipe, back foot pipe and the handle connecting tube of collapsible frame can realize folding or expansion fast, simple structure moreover, the potential safety hazard is less. The folding and unfolding of the application can be realized through the handle connecting rod.

Optionally, the first rotating mechanism is located between the control mechanism and the second rotating mechanism; the rear foot tube is connected to the first connecting part, and the front foot tube is connected to the second connecting part; the distance between the two front foot tubes, the distance between the two rear foot tubes and the distance between the two handle connecting tubes are sequentially increased.

By adopting the technical scheme, when the bicycle frame is folded, the two front foot pipes are positioned between the two rear foot pipes, the two handle connecting pipes are positioned at the outer sides of the two rear foot pipes, and the front foot pipes, the rear foot pipes and the handle connecting pipes can be close to each other as much as possible, so that the occupied space of the bicycle frame is reduced.

Optionally, an arm lock mechanism for limiting the expansion of the front foot tube relative to the rear foot tube is arranged between the front foot tube and the rear foot tube.

Through adopting above-mentioned technical scheme, when preceding foot pipe rotates to the receipts and closes the state towards the foot pipe, preceding foot pipe can support and paste in the foot pipe, can utilize arm lock mechanism to restrict the removal of preceding foot pipe and foot pipe at this moment, makes both keep the relative receipts and closes the state, reduces when appearing needing to keep receipts, and the relative foot pipe of preceding foot is expanded, influences receipts and closes the use.

In summary, the present application includes at least one of the following beneficial technical effects:

1. Each connecting pipe can be coaxially hinged through the corresponding control connecting part, the first connecting part or the second connecting part, the hinge structure is simple, an external linkage structure is not needed, and the production efficiency can be effectively improved;

2. When the device is operated, the second rotating piece and the first rotating piece can be sequentially rotated to realize folding or unfolding by controlling the control mechanism and even the control connecting part, and the operation process is simple and rapid;

3. the second pin shaft can improve the rotation stability between the second rotation mechanism and the control mechanism;

4. the foldable joint is adopted, so that the front foot tube, the rear foot tube and the handle connecting tube of the foldable frame can be folded or unfolded rapidly, and the foldable bicycle frame has a simple structure and small potential safety hazard. The folding and unfolding of the application can be realized through the handle connecting rod.

Drawings

FIG. 1 is a schematic view of a foldable frame of the present application in a collapsed condition;

FIG. 2 is an exploded view of the collapsible joint of the present application from a first perspective;

FIG. 3 is an exploded view of the collapsible joint of the present application from a second perspective;

FIG. 4 is an exploded view of the steering mechanism from a first perspective in accordance with an embodiment of the present application;

FIG. 5 is a schematic view of a connection structure of a control mechanism and a handle connecting tube according to an embodiment of the present application;

FIG. 6 is an exploded view of a second view of the steering mechanism in accordance with an embodiment of the present application;

FIG. 7 is an exploded view of a first rotary mechanism in accordance with an embodiment of the present application;

FIG. 8 is an exploded view of a second rotary mechanism from a first perspective in accordance with an embodiment of the present application;

FIG. 9 is an exploded view of a second rotary mechanism according to an embodiment of the present application;

FIG. 10 is a push-pull use state diagram of a foldable frame according to an embodiment of the present application;

FIG. 11 is a schematic view illustrating the positions of the operating mechanism, the first rotating mechanism, and the second rotating mechanism in the retracted state according to the embodiment of the present application;

FIG. 12 is a schematic view showing the positions of the operating mechanism, the first rotating mechanism and the second rotating mechanism in the unfolded state according to the embodiment of the present application;

FIG. 13 is a schematic view of a plug mechanism according to an embodiment of the present application;

FIG. 14 is a schematic view of the foldable frame of the present application in an unfolded state;

FIG. 15 is a schematic view of an exploded view of the handle attachment and steering mechanism of the present application;

FIG. 16 is a schematic view of the positions of the manipulation track groove, the first track groove, the second track groove, the first pin, etc. in FIG. 10;

FIG. 17 is a schematic view of the arm lock mechanism in an embodiment of the application;

FIG. 18 is a schematic view showing the positions of the manipulation track groove, the first track groove, the second track groove, the first pin, etc. in the unfolded state of the foldable joint according to the embodiment of the present application;

Fig. 19 is a schematic view showing the positions of the manipulation track groove, the first track groove, the second track groove, the first pin, etc. in the foldable joint process according to the embodiment of the application.

Reference numerals illustrate: 1. a front foot tube; 11. a wheel; 2. a rear foot tube;

3. A handle connecting tube; 31. pushing and pulling the tube; 32. a handle waist hole; 33. a handle pin hole; 34. a sliding member; 341. a through hole; 342. slipping waist holes; 35. a lock hole; 36. a lock body; 361. inclined strip holes; 37. a locking piece; 371. a guide conical surface; 372. a pin rod; 38. a pressure spring;

4. A collapsible joint; 41. a first pin; 42. a second pin; 421. a second limiting piece; 5. a joint pin shaft; 51. a cap portion;

6. A control mechanism; 61. a moving member; 611. a groove; 612. moving the waist hole; 613. a moving pin hole; 62. a rotating member; 621. a joint cover; 622. intra-articular reinforcing sheets; 623. a limiting piece; 6231. an outer limit part; 6232. an inner ring portion; 6233. a limit connecting part; 624. a joint side groove; 625. a joint center hole; 626. a joint central tube; 627. a control groove; 628. a manipulation track groove; 6281. controlling the folding end; 6282. controlling the unfolding end; 629. an outer convex groove; 63. a control connection part; 631. a moving groove; 632. a convex column; 64. a telescoping member; 65. an outer joint reinforcement sheet; 651. an outer strip hole; 66. an outer cover;

7. a first rotation mechanism; 71. a first rotary cover; 711. a first central bore; 712. a first central tube; 72. a first reinforcing sheet; 73. a first track groove; 731. a first folding end; 732. a first open end; 74. a first connection portion; 75. a first extended trace groove; 76. a first limiting hole; 77. a guide surface; 78. a first limiting member;

8. a second rotation mechanism; 81. a second rotary cover; 811. a second central bore; 812. a second center tube; 82. a second reinforcing sheet; 821. a second track groove; 8211. a second folding end; 8212. a second open end; 822. a second pin hole; 83. a second connecting portion; 84. a clamping groove; 85. a second limiting hole; 86. limiting the rotation hole;

9. A plug mechanism; 91. a plug cover; 92. a plug reinforcing sheet; 93. a plug connection portion; 94. a reversing rotation hole;

10. An arm lock mechanism; 101. fixing the lock base; 1011. the first arc chute; 1012. the second arc chute; 1013. a lock seat central hole; 102. a movable lock; 1021. a lock central hole; 1022. a first clamping block; 1023. a second clamping block; 1024. a lock fixing groove; 1025. a locking plate; 1026. a locking groove; 103. a fastener; 104. a locking pin; 105. and (3) a torsion spring.

Detailed Description

The application is described in further detail below with reference to fig. 1-19.

A foldable baby carriage or a frame which is common in daily life such as a foldable handcart or a wheelchair, and belongs to a bracket structure which is connected by a plurality of connecting pipes. In the actual production process, in order to be convenient for receive and close or expand, often add the linkage structure between each connecting pipe, the linkage structure of adding is located the connecting pipe outside generally, and overall structure is complicated relatively, and the linkage structure is the same to have connecting rod or connection piece articulated constitution simultaneously, therefore the spare part that needs to be connected in the production process is more, and production efficiency is lower, and is consuming time more. When in use, an operator needs to confirm that no other irrelevant objects are clamped in the linkage structure so as not to influence the unfolding or folding operation.

Furthermore, if the bracket structure is a connection structure of the front foot, the rear foot and the handle of the stroller frame, such as a joint structure. When the front foot and the rear foot are folded at present, the front foot and the rear foot are rotated relatively to be folded to drive the corresponding wheel 11 to be positioned at the rear side of the rear foot; then the handle is turned downwards and backwards until the handle is positioned at the rear side of the rear foot and is propped against the rear side of the front foot. Obviously, the space of the lower part of the frame is larger after folding, and the occupied space is not small. Therefore, how to simplify the joint structure and make the foldable frame occupy less space in the folded state is a problem to be solved.

The embodiment of the application discloses a foldable frame.

Referring to FIG. 1, a foldable frame includes two sets of side frames; each side frame comprises a front foot pipe 1, a rear foot pipe 2, a handle connecting pipe 3 and a foldable joint 4. The foldable joint 4 is arranged at one end of the front foot tube 1, the rear foot tube 2 and the handle connecting tube 3, and the foldable joint 4 is used for hinging the front foot tube 1, the rear foot tube 2 and the handle connecting tube 3.

A push-pull tube 31 is connected between the ends of the two handle connecting tubes 3 far away from the foldable joint 4, and wheels 11 are arranged at the ends of the front foot tube 1 and the rear foot tube 2 far away from the foldable joint 4. The distance between the two front foot tubes 1, the distance between the two rear foot tubes 2 and the distance between the two handle connecting tubes 3 are sequentially increased. When the folding device is folded, the two handle connecting pipes 3 are positioned at the outer sides of the rear foot pipes 2, the two front foot pipes 1 are positioned between the two rear foot pipes 2, and the handle connecting pipes 3 and the front foot pipes 1 are folded towards the rear foot pipes 2 in a turnover mode.

Referring to fig. 2 and 3, the foldable joint 4 includes a joint pin 5, a control mechanism 6, a first rotation mechanism 7, a second rotation mechanism 8, and a plug mechanism 9; one end of the joint pin shaft 5 is connected with the control mechanism 6, and the other end sequentially passes through the first rotating mechanism 7 and the second rotating mechanism 8 to be hinged with the plug mechanism 9; the first rotating mechanism 7, the second rotating mechanism 8 and the plug mechanism 9 can rotate around the joint pin shaft 5.

Referring to fig. 4, the steering mechanism 6 includes a moving member 61 and a rotating member 62. The rotation piece 62 includes a joint cover 621, an intra-joint reinforcing piece 622, and a stopper piece 623; a joint side groove 624 for installing the intra-joint reinforcing piece 622 and the limiting piece 623 is formed on one side of the joint cover 621, which is close to the first rotating mechanism 7; a joint center hole 625 matched with the joint pin shaft 5 is arranged in the middle of the joint cover 621, a joint center pipe 626 sleeved on the joint pin shaft 5 extends towards the notch of the joint side groove 624 from the joint center hole 625, and the axial length of the joint center pipe 626 is not greater than that of the joint side groove 624. Both the intra-articular reinforcing piece 622 and the limiting piece 623 are sleeved on the joint center tube 626. The joint cover 621 and the intra-joint reinforcing piece 622 are provided with matched control grooves 627, and the control grooves 627 extend along the aperture of the joint center hole 625 to form strip-shaped holes. The intra-articular reinforcing sheet 622 is further provided with a control track groove 628, the control track groove 628 is an arc-shaped hole, and the arc-shaped circle center is concentric with the joint center hole 625; the manipulation groove 627 is offset at one side of the manipulation track groove 628.

Referring to fig. 4, the manipulation track groove 628 is perforated with a second pin shaft 42, and the second pin shaft 42 rotates around the joint center hole 625 along the manipulation track groove 628. One end of the second pin 42 abuts against the joint side groove 624, and the other end extends toward the plug mechanism 9. The joint side groove 624 is formed with an outer convex groove 629 protruding radially outward along the joint center hole 625, and the outer convex groove 629 communicates with the joint side groove 624. The limiting piece 623 comprises an outer limiting portion 6231 embedded in the outer convex groove 629, an inner ring portion 6232 sleeved on the joint center tube 626, and a limiting connecting portion 6233 connected to the outer limiting portion 6231 and the inner ring portion 6232. The outer wall of the inner ring portion 6232 and one side of the limit connecting portion 6233 are tangent to one side of the control groove 627 close to the joint central tube 626, and the axial length of one side of the control inner hole is quite prolonged. The limit connection portion 6233 and the outer limit portion 6231 are located at a side of the manipulation slot 627 away from the manipulation track slot 628.

Referring to fig. 4, a manipulation coupling portion 63 for coupling with the handle coupling tube 3 is provided at the circumferential side of the joint cover 621. When the second pin shaft 42 rotates to abut against a side of the manipulation track groove 628 near the manipulation groove 627, the manipulation connecting portion 63 drives the handle connecting tube 3 to be in a folded state, one end of the manipulation track groove 628 abutting against the second pin shaft 42 in the folded state is set as a manipulation folding end 6281, and the other end is set as a manipulation unfolding end 6282.

Referring to fig. 5, the manipulation connection portion 63 is concavely provided with a moving groove 631 along a direction parallel to a length direction of the manipulation groove 627, and both the manipulation groove 627 and the joint center hole 625 are communicated with the moving groove 631. The bottom of the moving slot 631 is provided with two posts 632, and the two posts 632 in this embodiment are located at one side of the joint center hole 625 away from the notch of the moving slot 631. The end surface of one end of the moving member 61 is provided with a groove 611 matching with the convex column 632, and a telescopic member 64 for moving the moving member 61 towards the notch of the moving groove 631 is installed between the groove 611 and the convex column 632, and the telescopic member 64 is a spring in this embodiment.

Referring to fig. 5, the moving member 61 is provided with a moving waist hole 612 adjacent to the groove 611 for moving the joint pin 5 along the length direction of the manipulating groove 627; the length of the moving waist hole 612 is equal to the length of the manipulating slot 627. The moving member 61 is provided with a moving pin hole 613 at a side of the moving waist hole 612 away from the groove 611, and the moving pin hole 613 is provided with a first pin 41.

Referring to fig. 3, one end of the first pin 41 passes through the manipulation groove 627 near the side of the first rotation mechanism 7 and extends toward the plug mechanism 9.

Referring to fig. 6, the joint cover 621 is provided with an outer joint reinforcement piece 65 and an outer cover 66 at a side thereof remote from the first rotating mechanism 7, and the outer joint reinforcement piece 65 is embedded in the joint cover 621 by a loop. The joint outer reinforcement piece 65 is provided with an outer center hole corresponding to the joint center hole 625 and an outer bar hole 651 corresponding to the manipulation groove 627.

Referring to fig. 6, a cap 51 having an outer diameter larger than an inner diameter of the joint center hole 625 is fixed to one end of the joint pin 5 connected to the manipulation mechanism 6; the outer cover 66 is detachably clamped to the joint cover 621, and is used for shielding the joint cap 51 and limiting the joint pin 5 and the first pin 41 from moving away from the first rotating mechanism 7 along the axial direction, so that risks of pin removal of the joint pin 5 or the first pin 41 are reduced.

Referring to fig. 7, the first rotating mechanism 7 includes a first rotating cover 71 and a first reinforcing sheet 72. The first rotary cover 71 is provided with a first center hole 711 concentric with the joint center hole 625, and a first center tube 712 is provided on one side of the first center hole 711. The first reinforcing sheet 72 is sleeved on the first central tube 712 and is embedded on one side surface of the first rotating cover 71; in this embodiment, the first reinforcing piece 72 is located on a side of the first rotating cover 71 close to the control mechanism 6, and abuts against the limiting piece 623.

The first rotating cover 71 and the first reinforcing sheet 72 are provided with the same first track groove 73, and the first track groove 73 is an arc-shaped hole for the first pin 41 to rotate around the first central hole 711 and is a through groove.

The first reinforcing piece 72 extends radially outward along the first central hole 711 to form a first connecting portion 74, the first connecting portion 74 is connected to an end of the first reinforcing piece 72 near to an end of the first track groove 73, and when the first pin 41 rotates to abut against the end of the first track groove 73, the first connecting portion 74 is folded relative to the operating mechanism 6, so that the end of the first track groove 73 is set as a first folding end 731, and the other end is set as a first unfolding end 732. The first connecting portion 74 is used for connecting the rear leg 2, so that the rear leg 2 is connected to the foldable machine 4, and the first connecting portion 74 can be bent towards the first extending end 732 or towards another direction in order to limit the rotation and expansion range of the rear leg 2. In this embodiment, the first connecting portion 74 is bent away from the first extending end 732, so as to reduce the arc-shaped distance between the first connecting portion 74 and other components hinged to the joint pin 5.

Referring to fig. 7, the first track groove 73 is radially extended with a first extended track groove 75, the first extended track groove 75 being close to the first folding end 731 of the first track groove 73; the first extended trace groove 75 is an arc-shaped hole, and the center of the arc is concentric with the first central hole 711. The first flared end 732 of the first trajectory slot 73 extends radially with a first limiting aperture 76, the first limiting aperture 76 corresponding, preferably identical, in shape to the steering slot 627. In this embodiment, the first extended track groove 75 and the first limiting hole 76 are located on the radially outward side of the first track groove 73. The second pin shaft 42 is inserted into the first extending track groove 75.

Referring to fig. 7, a side of the first extended trace groove 75 remote from the first folding end 731 is provided with a guide surface 77 for facilitating movement of the first pin 41 from the first extended trace groove 75 to the first trace groove 73.

Referring to fig. 8 and 9, the second rotation mechanism 8 includes a second rotation cover 81 and a second reinforcing piece 82. The second rotary cover 81 has a second center hole 811 coaxial with the joint center hole 625, and a second center pipe 812 is provided on one side of the second center hole 811. The second reinforcing sheet 82 is sleeved on the second central tube 812 and is embedded on one side surface of the second rotating cover 81; in this embodiment, the second reinforcing piece 82 is located on a side of the second rotating cover 81 close to the handling mechanism 6, and abuts against the first rotating cover 71.

The second reinforcing piece 82 has a second connecting portion 83 extending radially outwardly along the second center hole 811, the second connecting portion 83 being for connecting with the forefoot tube 1. The second reinforcing piece 82 is provided with a second track groove 821 and a second pin hole 822, and the second track groove 821 is an arc-shaped hole for the first pin 41 to rotate around the second center hole 811. The second pin hole 822 is matched with one end of the second pin shaft 42 away from the control mechanism 6, and is used for penetrating the second pin shaft 42. The second pin hole 822 is located at one end of the second track groove 821. The second connecting portion 83 is located outside an end of the second track groove 821 near the second pin hole 822 in this embodiment.

Referring to fig. 8, when the first pin 41 rotates to abut against one side of the second track groove 821 near the second pin hole 822, the second connecting portion 83 drives the front foot tube 1 to rotate to be in a retracted state relative to the control mechanism 6, and one end of the second track groove 821 abutting against the first pin 41 in this state is set as a second retraction end 8211, whereas the other end is set as a second extension end 8212.

The second track groove 821 is provided with a clamping groove 84 and a second limiting hole 85 along the radial direction. The clamping groove 84 is close to the second folding end 8211, and is separated from the second folding end 8211 by the diameter distance of the first pin 41, i.e., the first pin 41 is not contacted with the clamping groove 84 when being abutted against the second folding end 8211; the first pin 41 needs to move from the second folding end 8211 to the second unfolding end 8212 by a certain distance, so as to be able to enter the slot 84. Therefore, when the foldable frame is folded, the arm lock mechanism is often arranged between the front foot tube 1 and the rear foot tube 2, and the arm lock mechanism is required to be unlocked before the foldable frame is unfolded, and the unlocked front foot tube 1 and rear foot tube 2 are separated by a certain distance. Therefore, the clamping groove 84 is arranged at the second folding end 8211, so that when the unfolding operation can be conveniently performed, the first pin 41 is controlled to move and rapidly move to the clamping groove 84, and the front foot tube 1 does not need to be manually moved towards the rear foot tube 2 to enable the first pin 41 to be aligned to the clamping groove 84, so that the unfolding operation efficiency can be improved.

The second limiting hole 85 is close to the second unfolding end 8212, the second limiting hole 85 is matched and corresponding to the control slot 627, and the second limiting hole 85 is preferably identical to the control slot 627. The aperture of the clamping groove 84 and the groove width of the second limiting hole 85 are matched with the first pin shaft 41. When the first pin 41 passes through the second track groove 821, one end of the first pin 41 abuts against the second rotating cover 81. The second rotating cover 81 can limit the first pin 41 to move along the axial direction, so that the occurrence of the out-of-pin of the second pin 42 is reduced.

Referring to fig. 10 and 11, when the handle bar connecting tube 3 is turned over the foldable joint 4, the manipulation track groove 628 is located on the side of the joint spool away from the rear foot tube 2; namely, in the embodiment, when the foldable frame is folded from the unfolded state, the handle connecting tube 3 is turned over towards the front foot direction and folded towards the front. The front foot tube 1 and the corresponding wheel 11 of the foldable frame which are folded in this way rotate towards the rear side of the rear foot tube 2 until the wheel 11 of the front foot tube 1 is positioned locally at the rear side of the rear foot tube 2; at the moment, the wheels 11 of the front foot pipe 1 and the wheels 11 of the rear foot pipe 2 are propped against the ground, so that the foldable frame can be simultaneously supported, and the foldable frame is convenient to store; and the front foot tube 1 is relatively attached to the rear foot tube 2, the push-pull tube 31 after overturning can be propped against the front side of the rear foot tube 2, and the occupied space of the front foot tube 1, the rear foot tube 2 and the handle connecting tube 3 after folding is relatively reduced.

Referring to fig. 11, the movement track of the second pin 42 sliding from one end to the other end of the manipulation track groove 628 around the joint pin 5 is an arc, and the arc is a manipulation arc; the motion track of the first pin 41 sliding from one end to the other end of the first track groove 73 around the joint pin 5 is an arc, and the arc is a first arc; the movement track of the second pin shaft 42 sliding from one end to the other end of the first extending track groove 75 around the joint pin shaft 5 is an arc, and the arc is a first extending arc; the movement track of the first pin 41 sliding from one end to the other end of the second track groove 821 around the joint pin 5 is an arc, and the arc is a second arc.

In this embodiment, the manipulation radian is equal to the second radian. The first radian is larger than the second radian; the first extension radian is not greater than the difference between the first radian and the second radian, and in this embodiment, the first extension radian is equal to the difference between the first radian and the second radian, that is, the radian of the first connection portion 74 and the radian of the second connection portion 83 are matched.

Referring to fig. 2 and 3, the intra-articular reinforcing sheet 622, the limiting sheet 623, the extra-articular reinforcing sheet 65, the first reinforcing sheet 72 and the second reinforcing sheet 82 are made of a harder material than the joint cover 621, so as to improve the use strength of the foldable joint 4 and prolong the service life. In this embodiment, the joint cover 621, the ring, the outer cover 66, the first rotating cover, and the second rotating cover are injection molded plastic members, and the intra-joint reinforcing piece 622, the limiting piece 623, the extra-joint reinforcing piece 65, the first reinforcing piece 72, and the second reinforcing piece 82 are iron pieces. The slot widths of the control slot 627, the first limiting hole 76 and the second limiting hole 85 along the length direction gradually decrease from one section to the other end, and in this embodiment, the control slot 627, the first limiting hole 76 and the second limiting hole 85 gradually decrease from one end near the axis of the joint pin 5 to the other end.

Referring to fig. 12, when the control slot 627, the first limiting hole 76 and the second limiting hole 85 are coaxially disposed, the handle connecting tube 3, the front foot tube 1 and the rear foot tube 2 are all in the unfolded state, and at this time, the first pin 41 is driven by the moving member 61 to move from one end close to the joint pin 5 to the other end along the control slot 627 by the action of the telescopic member 64. In addition, in the moving process, the first pin shaft 41 is gradually attached to the inner wall of the control groove 627, the inner wall of the first limiting hole 76 and the inner wall of the second limiting hole 85, so that the shaking condition of the control connecting part 63, the first connecting part 74 and the second connecting part 83 relative to the joint pin shaft 5 is reduced, and the unfolding state of the handle connecting pipe 3, the front foot pipe 1 and the rear foot pipe 2 is improved, and the structure is stable.

Referring to fig. 12, at least one of the operating mechanism 6, the first rotating mechanism 7 or the second rotating mechanism 8 extends toward the plug mechanism 9 and is provided with a limiting assembly for limiting the rotation of the plug mechanism 9. The limiting assembly comprises a first limiting piece 78 and a second limiting piece 421, and the first limiting piece 78 and the second limiting piece 421 are respectively arranged in the reversing rotation hole 94 in a penetrating manner; the first limiting member 78 and the second limiting member 421 rotate around the joint pin 5 to form a maximum arc which is not greater than the reversing rotation hole 94. In this embodiment, the first limiting member 78 is a limiting member fixed to the first reinforcing plate 72, and the second limiting member 421 is an end portion of the second pin shaft 42 passing through the second pin hole 822. The second limiting member 421 is located at a side of the first reinforcing sheet 72 adjacent to the first limiting hole 76. The second reinforcing piece 82 and the second rotating cover 81 are provided with a limiting rotating hole 86 through which the second limiting piece 421 passes through the second rotating mechanism 8.

The limiting component can limit the rotation range of the plug mechanism 9 relative to the joint pin shaft 5, so that the rotation angle can be adjusted according to requirements, the stability of the angle after rotation can be maintained, and the use safety is improved. After the plug mechanism 9 is rotationally adjusted, at least one of the first limiting piece 78 and the second limiting piece 421 is propped against one end of the reversing rotation hole 94, so that the reversing rotation hole 94 is limited to rotate, and the use safety is improved.

Referring to fig. 12 and 13, the plug mechanism 9 includes a plug cover 91 hinged to the joint pin 5 and a plug reinforcing piece 92, the plug reinforcing piece 92 is embedded in the plug cover 91, and the plug cover 91 extends outward in an axial direction perpendicular to the joint pin 5 to form a plug connection portion 93. For example, the plug reinforcement 92 may be an iron sheet, the plug cover 91 may be injection molded, and the plug reinforcement 92 may be embedded therein during injection molding of the plug cover. In this embodiment, through plug mechanism 9, but collapsible frame quick assembly disassembly basket, seat pocket etc. connect functional mechanism outward, improve collapsible frame's availability factor.

Referring to fig. 12 and 13, the plug cover 91 and the plug reinforcing piece 92 are provided with a reversing rotation hole 94 through which the limit assembly rotates about the joint pin 5. The reversing rotation hole 94 is an arc-shaped hole, and the hole width of the reversing rotation hole 94 is consistent with the length of the control groove 627. The radian of the running track of the reversing rotary hole 94, which rotates from one end to the other end around the joint pin 5, is a reversing radian, and the reversing radian is equal to the maximum arc distance between the first limiting piece 78 and the second limiting piece 421 around the joint pin 5. Therefore, when the plug mechanism 9 needs to perform reversing rotation, the first limiting member 78 needs to be close to the second limiting member 421 in a rotating way until the arc distance between the first limiting member and the second limiting member is smaller than the reversing radian.

Referring to fig. 13 and 14, when the front foot pipe 1 and the rear foot pipe 2 are unfolded relatively, the plug mechanism 9 can only be in the same state, and is kept relatively fixed, so that the stability of the insertion of the externally connected functional mechanisms such as the basket or the seat pocket is improved, and the use safety is improved. The limiting rotating hole 86 is an arc-shaped hole, and the radian of the moving track of the limiting rotating hole 86 rotating around the joint pin 5 from one end to the other end is limiting radian; the limiting radian is smaller than the reversing radian, that is, the sliding range of the second limiting member 421 along the limiting rotation hole 86 is smaller than the maximum radian distance between the first limiting member 78 and the second limiting member 421.

Referring to fig. 10 and 11, when the front foot tube and the rear foot tube are opposite to each other, the plug mechanism 9 can be rotated around the joint pin 5 when the foldable frame of the present application is used in a push-pull manner or in a storage manner, so that the plug connection portion 93 faces different directions relative to the handle connecting tube 3, and the external functional mechanism can be located at the rear side or the front side of the foldable frame accordingly, thereby improving the storage efficiency, and eliminating the need to separately store the external functional mechanism or the foldable frame. The external functional mechanism can be, for example, a seat pocket, when the plug connection part 93 rotates to be close to the handle connecting pipe 3, the seat pocket can be rotated and stored towards the rear side of the foldable frame, and when the foldable frame is suitable for an unfolding state, the seat pocket faces a cart operator; when the plug connection portion 93 rotates to deviate from the handle connecting tube 3, the seat pocket can be rotated and stored towards the front side of the foldable frame, and the seat pocket is suitable for people facing away from the cart in an unfolding state.

Referring to fig. 15, the handle connecting tube 3 is provided at an end portion remote from the push-pull tube 31 with a handle pin hole 32 corresponding to the movement pin hole 612 and a handle waist hole 33 corresponding to the movement pin hole 613. During assembly, the handle connecting pipe 3 is inserted into the moving piece 61, so that the handle pin hole 32, the moving waist hole 612 and the joint center hole 625 are matched and correspond to each other, and the joint pin shaft 5 is penetrated; simultaneously, the handle waist hole 33, the movable pin hole 613 and the control groove 627 are matched and correspond to each other, so that the first pin shaft 41 can be penetrated.

Referring to fig. 5 and 15, a slider 34 that can push the moving member 61 to move is provided in an end portion of the handle connecting tube 3 near the moving member 61, and one end of the slider 34 abuts against the moving member 61. The sliding piece 34 is provided with a through hole 341 in a clamping manner at one side close to the moving piece 61, and the through hole 341 axially intersects with the axial direction of the handle connecting tube 3; in this embodiment, the through hole 341 is perpendicular to the handle connecting tube 3; the handle connecting tube 3 is provided with a lock hole 35 corresponding to the through hole 341. A lock body 36 and a lock block 37 are provided in the through hole 341; a compression spring 38 for moving the lock piece 37 toward the lock hole 35 along the axial direction of the through hole 341 with respect to the lock body 36 is provided between the lock piece 37 and the lock body 36, so that one side of the lock piece 37 is engaged with the lock hole 35.

One side of the locking piece 37 close to the locking hole 35 is provided with a guide conical surface 371; the length of the guide cone 371 is smaller than the length of the lock hole 35 in a direction parallel to the axial direction of the handle bar attachment tube 3. The sliding member 34 has a sliding waist hole 342 on the side wall, which is connected to the through hole 341, and the length direction of the sliding waist hole 342 is parallel to the axial direction of the through hole 341. The lock body 36 is provided with an inclined bar hole 361 communicating with the through hole 341, and the inclined bar hole 361 is provided so as to be inclined with respect to the slide waist hole 342 in the longitudinal direction, and one end is close to the moving member 61 and the other end is far from the moving member 61. A pin 372 penetrating the inclined bar hole 361 and the sliding waist hole 342 is installed on one side of the locking block 37 away from the locking hole 35. The pin 372 has a diameter that matches the inclined bar hole 361 and is smaller than the slip waist hole 342. When the locking piece 37 is locked to the locking hole 35 under the action of the compression spring 38, the pin 372 abuts against one end of the inclined bar hole 361 away from the moving member 61.

When the folding operation is performed from the unfolded state, an operator presses the lock hole 35, so that the lock block 37 is separated from the lock hole 35; under the guiding action of the pin 372, the locking piece 37, the locking piece and the sliding piece 34 simultaneously move continuously along the inclined strip hole 361, so that the sliding piece 34 applies force to the moving piece 61, and the moving piece 61 drives the first pin 41 to move towards the bottom of the moving groove 631, the first pin 41 is separated from the control groove 627, the first limiting hole 76 and the second limiting hole 85, and the first pin 41 can rotate along the control track groove 628.

Referring to fig. 1 and 10, an arm lock mechanism 10 capable of being unlocked and connected to the front foot tube 1 and the rear foot tube 2 can be additionally arranged between the front foot tube 1 and the rear foot tube 2, so that the front foot tube 1 and the rear foot tube 2 can be kept connected in a relatively folded state, and the unfolding is reduced, and the folding use requirement is affected.

Referring to fig. 16, the arm lock mechanism 10 of the present embodiment includes a fixed lock base 101, a movable lock 102, and a fastener 103. The fixed lock seat 101 is fixedly arranged on the rear foot pipe 2, and the movable lock piece 102 is hinged to the outer side surface of the fixed lock seat 101 through a lock pin 104; a torsion spring 105 for keeping the movable lock 102 driven in one direction around the lock pin 104 is provided between the movable lock 102 and the fixed lock base 101. The movable lock 102 is provided with a lock center hole 1021 for the lock pin 104 to pass through; a lock fixing groove 1024 for sleeving the torsion spring 105 and a first clamping block 1022 and a second clamping block 1023 for limiting the rotation range of the torsion spring 105 are arranged on one side of the movable lock 102 close to the fixed lock seat 101; the first clamping block 1022 and the second clamping block 1023 are symmetrical with the locking piece center hole 1021 as an axis; the locking member fixing slot 1024 is close to the second locking block 1023. The fixed lock base 101 is provided with a lock base center hole 1013 through which the lock pin 104 passes. The fixed lock base 101 is provided with a first arc-shaped chute 1011 matching with the first clamping block 1022 and a second arc-shaped chute 1012 matching with the second clamping block 1023 on one side close to the movable lock piece 102, and the first arc-shaped chute 1011 and the second arc-shaped chute 1012 are coaxial with the lock base center hole 1013. The first arc chute 1011 and the second arc chute 1012 have the same rotation range around the lock base center hole 1013. The outer side of the torsion spring 105 is clamped in the locking piece fixing groove 1024, and one end of the inner side is fixedly connected to one side of the fixed locking seat 101, which is close to the first arc-shaped sliding groove 1011.

The movable locking piece 102 is provided with a locking piece 1025 on the side of the central hole of the fastener 103 far away from the second clamping block 1023 towards the front foot tube 1, and a locking groove 1026 concavely arranged downwards is arranged on the upper part of the locking piece 1025. The locking groove 1026 mates with the catch 103.

Referring to fig. 16 and 17, when the front foot pipe 1 rotates around the joint pin 5 to close to the rear foot pipe 2, the control handle connecting pipe 3 can be positioned above the foldable mechanism. If the handle connecting pipe 3 can serve as a push-pull handle, the whole foldable frame is pushed and pulled like a trunk, so that mobile carrying is realized, the mobile efficiency is improved, and the mobile carrying difficulty of the foldable frame is reduced. In this use state, the first folding end 731 and the second folding end 8211 are coaxial; the manipulating slot 627 is coaxial with the second limiting slot and is limited to the first track slot 73, so that when the handle connecting tube 3 is rotated to the upper surface of the foldable joint 4 in the locked state of the second reinforcing sheet 82 relative to the first reinforcing sheet 72 by the arm lock mechanism 10, the first pin 41 just abuts against the second unfolding end 8212 and the manipulating track slot 628, and is limited by the first track slot 73 and cannot move away from the second track slot 821 toward the second limiting hole 85; meanwhile, the second pin shaft 42 abuts against the control folding end 6281 and the second reinforcing sheet 82, so that the handle connecting tube 3 is limited to continue to turn backwards towards the rear foot tube 2, and the handle connecting tube 3 can be enabled to stably drive the foldable frame to move.

The implementation principle of the foldable frame provided by the embodiment of the application is as follows:

Referring to fig. 18 and 19, when the foldable frame is folded from the unfolded state, the locking piece 37 is pressed and the handle connecting tube 3 is pushed to the moving slot 631, so that the first pin 41 is separated from the manipulating slot 627 and enters the manipulating track slot 628, the first pin 41 is separated from the first limiting hole 76 and enters the first track slot 73, the second pin 42 is positioned in the first extending track slot 75, and the first pin 41 is separated from the second limiting hole 85 and enters the second track slot 821.

Then, the handle connecting tube 3 is turned towards the front leg tube 1, the first pin 41 rotates towards the first folding end 731 along the first unfolding end 732 of the first track groove 73, the first pin 41 rotates towards the second folding end 8211 along the second unfolding end 8212 of the second track groove 821 until the first pin 41 abuts against the second folding end 8211, and the second pin 42 rotates towards the manipulation unfolding end 6282 of the manipulation track groove 628 until the second pin 42 abuts against the manipulation folding end 6281.

Then, the handle connecting tube 3 is continuously controlled to drive the front foot tube 1, the control mechanism 6, the first pin shaft 41 and the second pin shaft 42 to approach the rear foot tube 2, and simultaneously the first pin shaft 41 is continuously rotated towards the first folding end 731 along the first unfolding end 732 of the first track groove 73, the first pin shaft 41 drives the second rotating mechanism 8 and the front foot tube 1 to rotate until the first pin shaft 41 abuts against the first folding end 731, that is, the front foot tube 1 abuts against the rear foot tube 2, and folding is completed.

Referring to fig. 16 and 17, when the foldable frame is unfolded from the folded state, the handle bar 3 is first pulled away from the moving slot 631, and the handle bar 3 is rotated to coaxially set the locking slot 84 and the control slot 627, the first pin 41 slides from one end of the control slot 627 near the joint center tube 626 to the other end, the first pin 41 moves from the first track slot 73 to the first extended track slot 75, and the first pin 41 moves from the second track slot 821 to the locking slot 84.

Then, the handle connecting tube 3 is continuously rotated, so that the front foot tube 1 and the second rotating mechanism 8 rotate away from the rear foot tube 2, and the second pin shaft 42 simultaneously rotates from the control folding end 6281 to the control unfolding end 6282 along the control track groove 628 until the first pin shaft 41 abuts against one side of the first extending track groove 75 away from the first folding end 731; the first pin 41 moves from the first extending track groove 75 to the first track groove 73 along the guide surface 77, meanwhile, the first pin 41 is separated from the clamping groove 84, and the first pin 41 slides from one end of the control groove 627 away from the joint central tube 626 to the other end; at this time, the first deployment end 732 is disposed coaxially with the second deployment end 8212, and the first restriction hole 76 is disposed coaxially with the second restriction hole 85. At this time, the wheels 11 of the front foot pipe 1 are separated from the vehicle of the rear foot pipe 2 to support the foldable frame, so that the foldable frame of the application can be stably placed on the ground.

Then, continuing to rotate the handle connecting tube 3, so that the second pin shaft 42 continues to rotate towards the operation unfolding end 6282 along the operation track groove 628, and meanwhile, the handle connecting tube 3 turns towards the direction away from the front foot tube 1; until the second pin shaft 42 abuts against the control expansion end 6282, the control groove 627 and the second limiting hole 85 are coaxially arranged, and the handle connecting tube 3 rotates to the position above the foldable joint 4.

Finally, under the action of the telescopic piece 64, the moving piece 61 drives the first pin 41 to move towards the notch direction of the moving groove 631, so that the first pin 41 is limited at one end of the control groove 627 away from the joint central tube 626, the first pin 41 is positioned in the first limiting hole 76 and the second limiting hole 85, and meanwhile, the locking piece 37 is correspondingly clamped in the locking hole 35, and the unfolding is completed.

The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims

1. A collapsible joint, characterized in that: comprises a joint pin shaft (5), a control mechanism (6), a first rotating mechanism (7) and a second rotating mechanism (8); the joint pin shaft (5) is arranged in a penetrating manner on the control mechanism (6), the first rotating mechanism (7) and the second rotating mechanism, and the first rotating mechanism (7) and the second rotating mechanism (8) can rotate around the joint pin shaft (5);

the control mechanism (6) is provided with a control groove (627) staggered with the joint pin shaft (5), the control groove (627) is provided with a first pin shaft (41) parallel to the joint pin shaft (5), and the control mechanism (6) is used for driving the first pin shaft (41) to rotate around the joint pin shaft (5); the control mechanism (6) is provided with a control connecting part (63);

The first rotating mechanism (7) is provided with a first track groove (73) for the first pin shaft (41) to slide around the joint pin shaft (5); the motion track of the first pin shaft (41) sliding from one end to the other end of the first track groove (73) around the joint pin shaft (5) is an arc, and the radian is a first radian; the first rotating mechanism (7) is provided with a first connecting part (74);

The second rotating mechanism (8) is provided with a second track groove (821) for the first pin shaft (41) to slide around the joint pin shaft (5); the motion track of the first pin shaft (41) sliding from one end to the other end of the second track groove (821) around the joint pin shaft (5) is an arc, and the radian is a second radian; the second rotating mechanism (8) is provided with a second connecting part (83);

The first radian is larger than the second radian;

The second rotating mechanism (8) is provided with a second pin shaft (42) which is staggered with the second track groove (821), and the second pin shaft (42) is parallel to the joint pin shaft (5);

The first rotating mechanism (7) is provided with a first extending track groove (75) for the second pin shaft (42) to slide around the joint pin shaft (5); the motion track of the second pin shaft (42) sliding from one end to the other end of the first extending track groove (75) around the joint pin shaft (5) is an arc, and the arc is a first extending arc; the first extension radian is not greater than the radian difference between the first radian and the second radian;

The plug mechanism (9) is penetrated through the joint pin shaft (5); the plug is positioned at one side of the control mechanism (6); the control mechanism (6), the first rotating mechanism (7) or the second rotating mechanism (8) is at least provided with a limiting component for limiting the rotation of the plug mechanism (9).

2. The collapsible joint of claim 1, wherein: the control groove (627) radially extends along the joint pin shaft (5) to form a strip-shaped groove; the control connecting part (63) is close to the control groove (627);

The first extending track groove (75) is staggered with the first track groove (73) along the radial direction of the joint pin shaft; the first extending track groove (75) is communicated, one end of the first extending track groove (75) is propped against one end of the first track groove (73), and the other end of the first extending track groove (75) extends towards the other end of the first track groove (73); the first connecting part (74) is close to one end of the first track groove (73) propped against the first extending track groove (75);

One end of the second track groove (821) radially extends along the joint pin shaft (5) to form a clamping groove (84) matched with the outer diameter of the first pin shaft (41), and the clamping groove (84) is used for limiting the first pin shaft (41) to slide along the second track groove (821); when the second rotating mechanism (8) moves to the position that the first pin shaft (41) abuts against the clamping groove (84), the first pin shaft (41) just moves from the first track groove (73) to the first extending track groove (75), and the control groove (627) moves from one end to the other end; the second connecting part (83) is close to the clamping groove (84).

3. The collapsible joint of claim 2, wherein: one end of the first extending track groove (75) far away from the first connecting part (74) is provided with a guide surface (77) for the first pin shaft (41) to move from the first extending track groove (75) to the first track groove (73).

4. The collapsible joint of claim 2, wherein: one end of the first track groove (73) far away from the first connecting part (74) is extended with a first limiting hole (76) correspondingly matched with the control groove (627); and a second limiting hole (85) correspondingly matched with the control groove (627) is formed in the end, far away from the clamping groove (84), of the second track groove (821).

5. The collapsible joint of claim 2, wherein: the control groove (627) gradually reduces the groove width from one end of the first pin shaft (41) which is driven to slide around the first track groove (73) to the other end.

6. The collapsible joint of claim 2, wherein: the control mechanism (6) comprises a moving part (61) and a rotating part (62); the control connecting part (63) is fixed on the rotating piece (62); the control groove (627) is positioned on the rotating piece (62); a telescopic piece (64) for driving the moving piece (61) to be far away from the rotating piece (62) is arranged between the moving piece (61) and the control connecting part (63);

one end of the first pin shaft (41) penetrates through the control groove (627) and is connected to the moving piece (61);

The moving part (61) is provided with a moving waist hole (612) for the joint pin shaft (5) to move along the length direction of the control groove (627); the length of the movable waist hole (612) is matched with the length of the control groove (627).

7. The collapsible joint of claim 1, wherein: the control mechanism (6) is provided with a control track groove (628) for the second pin shaft (42) to slide around the joint pin shaft (5); the control track groove (628) is staggered with the control groove (627);

The first track groove (73) and the first extending track groove (75) are through grooves, the control track groove (628) and the control groove (627) are through grooves or the second track groove (821) is a through groove.

8. The collapsible joint (4) according to claim 1, wherein: the plug mechanism (9) is provided with a reversing rotation hole (94) for the limiting assembly to rotate around the joint pin shaft (5); the limiting assembly comprises a first limiting piece (78) and a second limiting piece (421), and the first limiting piece (78) and the second limiting piece (421) are respectively arranged in the reversing rotating hole (94) in a penetrating mode; the first limiting piece (78) and the second limiting piece (421) rotate around the joint pin shaft (5) to form a maximum radian which is not larger than the reversing rotating hole (94).

9. A foldable frame, characterized in that: comprises two groups of side frames; each side frame comprises a front foot tube (1), a rear foot tube (2), a handle connecting tube (3) and a foldable joint (4) according to any one of claims 1-7; the foldable joint (4) is used for hinging the front foot tube (1), the rear foot tube (2) and the handle connecting tube (3);

The front foot tube (1) and the rear foot tube (2), one is connected with the first connecting part (74) and the other is connected with the second connecting part (83); the handle connecting tube (3) is connected with the control connecting part (63).

10. The foldable frame of claim 9, wherein: the first rotating mechanism (7) is positioned between the control mechanism (6) and the second rotating mechanism (8); the rear foot tube (2) is connected to the first connecting part (74), and the front foot tube (1) is connected to the second connecting part (83);

The distance between the two front foot tubes (1), the distance between the two rear foot tubes (2) and the distance between the two handle connecting tubes (3) are sequentially increased.

11. The foldable frame of claim 9, wherein: an arm lock mechanism (10) for limiting the front foot tube (1) to be unfolded relative to the rear foot tube (2) is arranged between the front foot tube (1) and the rear foot tube (2).