CN209956049U

CN209956049U - Cart frame

Info

Publication number: CN209956049U
Application number: CN201920385764.5U
Authority: CN
Inventors: 刘顶山
Original assignee: Zhongshan Rich Daily Products Co Ltd
Current assignee: Zhongshan Rich Daily Products Co Ltd
Priority date: 2019-03-25
Filing date: 2019-03-25
Publication date: 2020-01-17
Anticipated expiration: 2029-03-25

Abstract

The utility model discloses a cart frame, which adopts a novel linkage structure and comprises a front linkage rod hinged with a front foot rod and a rear linkage rod hinged with a rear foot rod, wherein the rear end of the front linkage rod is hinged with the front end of the rear linkage rod, and a locking mechanism can be arranged between any two of the lower end of a push rod, the upper end of the front foot rod and the upper end of the rear foot rod as required; because the upper end of the folding stay cord is eccentrically connected with the lower end of the push rod, when the push rod is turned downwards, the lower end of the folding stay cord upwards lifts the rear end of the front linkage rod and the front end of the rear linkage rod, so that the front foot rod and the rear foot rod are relatively closed and folded; when the cart frame is unfolded, the lower end of the ejector rod positioned on the front foot rod pushes against the front part of the front linkage rod to limit the rotation of the front linkage rod; through the matching use of the flexible folding pull rope and the ejector rod, the stroller frame can be conveniently, quickly and smoothly folded, and the stability and reliability of the stroller frame during unfolding use are ensured.

Description

Cart frame

[ technical field ] A method for producing a semiconductor device

The utility model relates to an infant's frame, especially a shallow frame.

[ background of the invention ]

The frame of the existing infant stroller has a plurality of structures, so that the frame is convenient to fold, place and store or carry, and the frame of the infant stroller is required to have a corresponding folding function. In order to realize folding, a linkage folding structure is correspondingly arranged between the front foot rod and the rear foot rod. Different customers and standards have different requirements for the structure of the linkage folding.

In order to meet the requirements of customers and overcome the defects in the prior art, a novel linkage structure for a frame of a baby stroller is researched and provided.

[ Utility model ] content

The to-be-solved technical problem of the utility model is to provide a cart frame adopts neotype linkage structure, include with preceding linkage of foot bar articulated, with back foot bar articulated back linkage, preceding linkage rear end is articulated with back linkage front end, and locking mechanical system can set up as required between arbitrary two of push rod lower extreme, preceding foot bar upper end, back foot bar upper end. Because the upper end of the folding stay cord is eccentrically connected with the lower end of the push rod, when the push rod is turned downwards, the lower end of the folding stay cord upwards lifts the rear end of the front linkage piece and the front end of the rear linkage piece, so that the front foot bar and the rear foot bar are relatively closed and folded; when the stroller frame is unfolded, the lower end of the ejector rod positioned on the front foot rod pushes against the front part of the front linkage part to limit the rotation of the front linkage part; through the matching use of the flexible folding pull rope and the ejector rod, the stroller frame can be conveniently, quickly and smoothly folded, and the stability and reliability of the stroller frame during unfolding use are ensured.

In order to solve the technical problem, the utility model relates to a cart frame, including preceding foot bar 1, back foot bar 2, push rod 3, preceding linkage 4, back linkage 5 and the stay cord 6 of folding up.

The lower end of the front foot rod 1 is provided with a front wheel assembly 11, and the lower end of the rear foot rod 2 is provided with a rear wheel assembly 21.

The upper end of the rear foot rod 2 is rotatably connected with the upper end of the front foot rod 1, the lower end of the push rod 3 is rotatably connected with the upper end of the rear foot rod 2, the front end of the front linkage piece 4 is hinged with the front foot rod 1, the rear end of the front linkage piece 4 is hinged with the front end of the rear linkage piece 5, and the rear end of the rear linkage piece 5 is hinged with the rear foot rod 2.

The upper end of the folding stay cord 6 is connected to the lower end of the push rod 3 and is eccentric to a rotating shaft connected with the push rod 3 and the rear foot bar 2, the lower end of the folding stay cord 6 is connected to the rear end of the front linkage piece 4 or the front end of the rear linkage piece 5 or the hinged shaft connected with the front linkage piece 4 and the rear linkage piece 5, so that when the push rod 3 is turned downwards, the folding stay cord 6 pulls the front linkage piece 4 and the rear linkage piece 5 to enable the front foot bar 1 and the rear foot bar 2 to be relatively drawn together.

The front foot rod 1 is connected with a mandril 7 in a sliding mode, when the frame of the cart is unfolded, the upper end of the mandril 7 is limited and propped against the lower end of the push rod 3, and the lower end of the mandril 7 is propped against the front portion of the front linkage part 4 to limit the front end of the front linkage part 4 to rotate around a hinged shaft of the front foot rod 1.

A locking mechanism 8 is arranged between any two of the lower end of the push rod 3, the upper end of the front foot rod 1 and the upper end of the rear foot rod 2 to lock the state of the cart frame when the cart frame is unfolded.

As mentioned above, the front leg bar 1 is provided with the guide sliding sleeve 71, and the top bar 7 is slidably connected to the guide sliding sleeve 71.

According to the cart frame, the lower end of the ejector rod 7 is hinged to the front part of the front linkage piece 4.

According to the cart frame, the lower end of the push rod 3 is relatively and fixedly connected with the turnover seat 31, the turnover seat 31 is provided with the seat frame connecting seat 32 which moves with the turnover seat 31, the turnover seat 31 is hinged with the upper end of the rear foot rod 2, and the turnover seat 31 is provided with the jacking surface 311 which is used for jacking the upper end of the jacking rod 7.

The stroller frame further comprises a handle rod 33, and the lower end of the handle rod 33 is telescopically and slidably connected with the push rod 3.

In the stroller frame, the locking mechanism 8 is disposed between the lower end of the push rod 3 and the upper end of the front foot bar 1, and when the handle bar 33 slides downward relative to the push rod 3, the lower end of the handle bar 33 triggers the locking mechanism 8 to unlock the push rod 3, so that the push rod 3 can be folded downward relative to the rear foot bar 2.

As described above, the locking mechanism 8 includes the locking hole 81 directly or indirectly disposed at the lower end of the push rod 3 and the locking tongue 82 disposed at the upper end of the front leg bar 1 and capable of elastically stretching, and when the stroller frame is unfolded, the locking tongue 82 is elastically inserted into the locking hole 81 to limit the push rod 3 from being turned over downward relative to the rear leg bar 2; when the handle rod 33 slides downward and retracts into the push rod 3, the lower end of the handle rod 33 directly or indirectly pushes the latch 82 out of the latch hole 81 to release the locked state of the push rod 3, so that the push rod 3 can be folded downward.

The stroller frame further comprises an elastic element 10, the elastic element 10 is a compression spring and is arranged on the front foot rod 1, and the upper end and the lower end of the elastic element 10 respectively elastically press the top rod 7 and the front foot rod 4; or the elastic piece 10 is a torsion spring and is arranged at the hinged part of the front foot rod 1 and the front linkage piece 4; or the elastic part 10 is a torsion spring and is arranged at the hinged part of the rear foot rod 2 and the rear linkage part 5; or the elastic part 10 is a torsion spring and is arranged at the hinged part of the front linkage part 4 and the rear linkage part 5.

The utility model also provides a cart frame, including preceding foot bar 1, back foot bar 2, push rod 3, preceding linkage 4, back linkage 5, ejector pin 7 and elastic component 10.

The ejector rod 7 is connected to the front foot rod 1 in a sliding mode, when the frame of the cart is unfolded, the upper end of the ejector rod 7 is limited and propped against by the lower end of the push rod 3, and the lower end of the ejector rod 7 is propped against the front portion of the front linkage piece 4 to limit the front end of the front linkage piece 4 to rotate around a hinged shaft of the front linkage piece 4 and the front foot rod 1.

The elastic piece 10 is a compression spring and is arranged on the front foot rod 1, and the upper end and the lower end of the elastic piece 10 are respectively elastically pressed on the ejector rod 7 and the front foot rod 1; or the elastic piece 10 is a torsion spring and is arranged at the hinged part of the front foot rod 1 and the front linkage piece 4; or the elastic part 10 is a torsion spring and is arranged at the hinged part of the rear foot rod 2 and the rear linkage part 5; or the elastic part 10 is a torsion spring and is arranged at the hinged part of the front linkage part 4 and the rear linkage part 5.

Compared with the prior art, the utility model relates to a shallow frame has as follows a bit:

1. the front linkage piece and the rear linkage piece are lifted by adopting a flexible folding pull rope, so that the front foot rod and the rear foot rod of the cart frame are relatively closed and folded.

2. The push rod is arranged on the front foot rod in a sliding mode, and when the cart frame is in an unfolded state, the upper end and the lower end of the push rod respectively press against the lower end of the push rod and the front portion of the front linkage piece, so that the front linkage piece is effectively limited from rotating relative to the front foot rod, and the cart frame is further ensured to be unfolded stably and reliably.

3. The foldable stroller frame has the advantages that the foldable pull rope and the ejector rod are matched for use, the foldable stroller frame is simple and ingenious in design, the foldable pull rope is convenient, rapid and smooth to fold, and the ejector rod ensures that the foldable stroller frame is stable and reliable when being unfolded for use.

4. The utility model discloses an adopt the elastic component, utilize the elasticity of elastic component can make the automatic expansion of shallow frame or fold up, further improve the convenience of using.

[ description of the drawings ]

The following detailed description of embodiments of the present invention is provided with reference to the accompanying drawings, in which:

fig. 1 is one of the three-dimensional structural diagrams of a cart frame of the present invention.

Fig. 2 is a second schematic perspective view of a stroller frame according to the present invention.

Fig. 3 is a side view of the cart frame of the present invention.

Fig. 4 is a perspective view of the stroller frame in a folded state according to the present invention.

Fig. 5 is a second perspective view of the foldable frame of the stroller of the present invention.

Fig. 6 is a front view of the connection of the rear foot bar, the front foot bar and the push rod in the frame of the cart.

Fig. 7 is a sectional view taken along a-a of fig. 6.

Fig. 8 is an enlarged view of mark B of fig. 3.

Fig. 9 is a front view of a front linkage of a stroller frame according to the present invention.

Fig. 10 is a schematic structural view of the stroller frame of the present invention using a torsion spring and a folding stay.

Fig. 11 is a schematic structural view of the stroller frame of the present invention using a compression spring and a folding pull rope.

Fig. 12 is a schematic structural view of the stroller frame of the present invention, which does not employ a folding rope and only employs an elastic member.

Fig. 13 is a second schematic structural view of the stroller frame of the present invention, which does not employ a folding rope and only employs an elastic member.

[ detailed description ] embodiments

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As a first embodiment of the present invention, as shown in fig. 1-11, the present invention relates to a stroller frame, which comprises a front leg bar 1, a rear leg bar 2, a push rod 3, a front linkage 4, a rear linkage 5 and a folding stay cord 6; in this embodiment, the front leg member 1 has one leg, the rear leg member 2 has two legs, the flexible rope of the folding pulling rope 6 can only provide pulling force but not pressing force, and can be an adhesive tape, a steel rope or other rope, and the seat frame can be relatively fixedly connected to the lower portion of the pushing rod.

The lower end of the front foot rod 1 is provided with a support, two ends of the support are connected with two front wheel assemblies 11, and in order to provide support for the feet of a seated infant, a pedal plate is relatively fixedly arranged on the front foot rod. The lower end of each rear foot rod 2 is provided with a rear wheel component 21, and a brake lever is connected between the two rear wheel components 21.

As shown in figure 1, the upper parts of the two rear foot rods are connected in a U-shaped structure, the upper ends of the two rear foot rods 2 are rotatably connected with the upper end of the front foot rod 1, the lower end of the push rod 3 is rotatably connected with the upper end of the rear foot rod 2, as shown in fig. 2-3, the front end of the front linkage piece 4 is hinged with the front foot bar 1, the rear end of the front linkage piece 4 is hinged with the front end of the rear linkage piece 5, the rear end of the rear linkage part 5 is hinged with the rear foot bar 2, the upper end of the folding pull rope 6 is connected with the lower end of the push rod 3 and is eccentric to the rotating shaft of the push rod 3 connected with the rear foot bar 2, the lower end of the folding pull rope 6 is connected with the rear end of the front linkage part 4, or connected to the front end of the rear linkage 5, or connected to the hinge axis of the front linkage 4 and the rear linkage 5, when the push rod 3 is turned downwards, the folding pull rope 6 pulls the front linkage piece 4 and the rear linkage piece 5 to enable the front foot rod 1 and the rear foot rod 2 to be relatively closed and folded; when the stroller frame is folded, the upper end of the folding stay cord is eccentrically connected with the lower end of the push rod, when the push rod is folded downwards, the lower end of the folding stay cord upwards lifts the rear end of the front linkage piece and the front end of the rear linkage piece, so that the front foot bar and the rear foot bar are relatively close to each other to be folded, and the stroller frame can be conveniently, quickly and smoothly folded through the flexible folding stay cord.

As shown in fig. 2, 4, 5 and 7, a top rod 7 is slidably connected to the front foot rod 1, when the stroller frame is unfolded, the upper end of the top rod 7 is limited and propped against the lower end of the push rod 3, and the lower end of the top rod 7 is propped against the front part of the front linkage member 4 to limit the front end of the front linkage member 4 to rotate around a hinge shaft of the front foot rod 1; when the cart frame is unfolded for use, the lower end of the ejector rod on the front foot rod is pressed against the front part of the front linkage part to limit the rotation of the front linkage part, so that the front foot rod, the ejector rod, the front linkage part, the rear linkage part and the rear foot rod form a stable triangular structure, and the cart frame is stable and reliable when being unfolded for use.

A locking mechanism 8 is arranged between any two of the lower end of the push rod 3, the upper end of the front foot rod 1 and the upper end of the rear foot rod 2 to lock the state of the stroller frame when the stroller frame is unfolded, and when the locking mechanism 8 is unlocked, the stroller frame can be folded.

In order to improve the reliability and stability of the ejector rod, a guide sliding sleeve 71 is arranged on the inner side of the upper part of the front foot rod 1, and the ejector rod 7 is connected with the guide sliding sleeve 71 in a sliding manner.

Further, in order that the lower end of the ejector rod can reliably and always press the front part of the front linkage piece when the frame of the cart is unfolded, the lower end of the ejector rod 7 is hinged to the front part of the front linkage piece 4. In this embodiment, as shown in fig. 9, the front linkage is a J-shaped structure, and includes a position-limiting protrusion 41 and a bending section 42 disposed on the bottom side of the front portion. The free end of the bending section is hinged with the front foot rod, the lower end of the ejector rod 7 is hinged with the bending part of the front linkage piece 4, as shown in fig. 8, when the frame of the cart is unfolded, the limiting bulge 41 can be abutted against the side wall of the front foot rod to limit the front linkage piece to downwards rotate around the hinging shaft of the front linkage piece and the front foot rod, and the use reliability and stability of the frame of the cart are further ensured when the frame of the cart is unfolded.

As shown in fig. 2 and 7, the lower end of the push rod 3 is relatively and fixedly connected with a turning seat 31, the turning seat 31 is provided with a seat frame connecting seat 32 moving with the turning seat 31, the turning seat 31 is hinged with the upper end of the rear foot rod 2, and the turning seat 31 is provided with a pressing surface 311 for pressing the upper end of the push rod 7.

The utility model relates to a shallow frame still includes handle bar 33, handle bar 33 lower extreme is connected with push rod 3 with scalable slip, and handle bar 33 accessible plays beans and 3 adjustable connections of push rod to improve comfort level and the adjustability of using.

In this embodiment, as shown in fig. 4-7, the locking mechanism 8 is disposed between the lower end of the push rod 3 and the upper end of the front leg bar 1, and when the handle bar 33 slides downward relative to the push rod 3, the lower end of the handle bar 33 triggers the locking mechanism 8 to unlock the push rod 3, so that the push rod 3 can be folded downward relative to the rear leg bar 2.

The locking mechanism 8 comprises a locking hole 81 directly or indirectly arranged at the lower end of the push rod 3 and a bolt 82 which is arranged at the upper end of the front foot rod 1 and can elastically stretch, when the frame of the trolley is unfolded, the bolt 82 is elastically inserted into the locking hole 81 to limit the push rod 3 to be turned downwards relative to the rear foot rod 2; when the handle rod 33 slides downward and retracts into the push rod 3, the lower end of the handle rod 33 directly or indirectly pushes the latch 82 out of the latch hole 81 to release the locked state of the push rod 3, so that the push rod 3 can be folded downward.

In this embodiment, the lower end of the push rod 3 is fixedly connected to the tilting seat 31, two sides of the tilting seat 31 are rotatably connected to the upper ends of the two rear foot bars through a rotating shaft, and the lock hole is arranged at the front of the tilting seat 31.

As shown in fig. 7, a locking elastic member 84 elastically pressing the latch is disposed in the upper portion of the front leg, the upper end of the locking elastic member 84 elastically presses the latch and the lower end elastically presses a limit boss inside the front leg, so that the latch can elastically extend out of the upper end of the front leg. In order to unlock smoothly, a top pressing block 83 is slidably arranged at the lower end of the push rod, when the handle rod 33 retracts downwards into the push rod, the lower end of the handle rod 33 indirectly ejects the lock tongue in the lock hole through the top pressing block 83, and then the unlocking action is completed. In addition, the top pressing block 83 and the bolt 82 are respectively provided with a guide sliding chute, and the top pressing block 83 and the bolt 82 are correspondingly connected to the lower end of the push rod and the upper end of the front foot rod in a sliding manner through a pin shaft.

As shown in fig. 10-11, in order to improve the convenience of the present invention in the using process, the embodiment further includes an elastic member 10. The elastic member 10 may be disposed at different positions as needed:

when the elastic member 10 is a compression spring and is arranged on the front foot rod 1, the upper end and the lower end of the elastic member 10 respectively elastically press against the top rod 7 and the front foot rod 1, and the lower end of the compression spring presses against the guide sliding sleeve 71 on the front foot rod in the utility model; the elastic member 10 can assist the stroller frame to fold, that is, when the lower end of the push rod does not press the upper end of the ejector rod any more, the elastic member 10 presses the ejector rod 7 upwards to slide, the lower end of the ejector rod 7 lifts upwards to pull the front linkage member 4, and the front linkage member 4 acts correspondingly on the rear linkage member, so that the front foot rod and the rear foot rod are relatively drawn together to fold.

When the elastic member 10 is a torsion spring and is arranged at the hinged position of the front foot rod 1 and the front linkage member 4, two ends of the torsion spring are respectively abutted against the front foot rod 1 and the front linkage member 4, so that the front linkage member 4 is subjected to a torsion force, the rear end of the front linkage member 4 always has a downward rotating trend around the hinged shaft of the front linkage member and the front foot rod 1, and therefore when the stroller frame is unfolded, the stroller frame is automatically unfolded by the torsion force of the torsion spring and the lower end of the pull-down push rod of the folding pull rope.

When the elastic member 10 is a torsion spring and is arranged at the hinged position of the rear foot rod 2 and the rear linkage member 5, two ends of the torsion spring respectively lean against the rear foot rod 2 and the rear linkage member 5, so that the rear linkage member 5 is subjected to a torsion force, the front end of the rear linkage member always has a downward rotating trend around the hinged shaft of the rear linkage member and the hinged shaft of the rear foot rod 1, and when a stroller frame is unfolded, the torsion force of the torsion spring and the lower end of the folding pull-down push rod can automatically unfold the stroller frame.

When the elastic member 10 is a torsion spring and is arranged at the hinged position of the front linkage member 4 and the rear linkage member 5, the two ends of the torsion spring respectively abut against the front linkage member 4 and the rear linkage member 5, so that the front linkage member 4 and the rear linkage member 5 both receive a torsion force, the rear end of the front linkage member 4 and the front end of the rear linkage member always have a downward rotating trend around the hinged shaft thereof, and therefore when the stroller frame is unfolded, the stroller frame can be automatically unfolded by the torsion force of the torsion spring and the lower end of the pull-down push rod of the folding pull rope.

As another embodiment of the present invention, compared with the above embodiments, the present embodiment does not use a folding rope, as shown in fig. 12-13, and the specific solution of the present embodiment is as follows: comprises a front foot rod 1, a rear foot rod 2, a push rod 3, a front linkage piece 4, a rear linkage piece 5, a push rod 7 and an elastic piece 10. The lower end of the front foot rod 1 is provided with a front wheel assembly 11, and the lower end of the rear foot rod 2 is provided with a rear wheel assembly 21. The upper end of the rear foot rod 2 is rotatably connected with the upper end of the front foot rod 1, the lower end of the push rod 3 is rotatably connected with the upper end of the rear foot rod 2, the front end of the front linkage piece 4 is hinged with the front foot rod 1, the rear end of the front linkage piece 4 is hinged with the front end of the rear linkage piece 5, and the rear end of the rear linkage piece 5 is hinged with the rear foot rod 2. The push rod 7 is connected to the front foot rod 1 in a sliding mode, when the stroller frame is unfolded, the upper end of the push rod 7 is limited and propped against by the lower end of the push rod 3, the lower end of the push rod 7 is propped against the front portion of the front linkage piece 4 to limit the front end of the front linkage piece 4 to rotate around a hinge shaft of the front linkage piece and the front foot rod 1, and a locking mechanism 8 is arranged between any two of the lower end of the push rod 3, the upper end of the front foot rod 1 and the upper end of the rear foot rod 2 to lock the unfolded state of the stroller frame.

When the elastic piece 10 is a compression spring and is arranged on the front foot rod 1, the upper end and the lower end of the elastic piece 10 respectively elastically press the top rod 7 and the front foot rod 1; when the lower end of the push rod does not press the upper end of the ejector rod any more, the elastic part 10 presses the ejector rod 7 upwards to slide, the lower end of the ejector rod 7 lifts the front linkage part 4 upwards, the front linkage part 4 acts correspondingly on the rear linkage part, and then the front foot rod and the rear foot rod are relatively closed and folded.

When the elastic member 10 is a torsion spring and is arranged at the hinged position of the front foot rod 1 and the front linkage member 4, two ends of the torsion spring are respectively abutted against the front foot rod 1 and the front linkage member 4, so that the front linkage member 4 is subjected to a torsion force, the rear end of the front linkage member 4 always has a tendency of upwards rotating around the hinged shaft of the front linkage member and the front foot rod 1, and after the locking of the stroller frame is released, the rear end of the front linkage member 4 can be automatically upwards turned over by the torsion force of the torsion spring, the front end of the rear linkage member is also upwards turned over, the front foot rod and the rear foot rod are correspondingly pulled to be relatively close, and the stroller frame is automatically folded.

When the elastic member 10 is a torsion spring and is arranged at the hinged position of the rear foot rod 2 and the rear linkage member 5, two ends of the torsion spring are respectively abutted against the rear foot rod 2 and the rear linkage member 5, so that the rear linkage member 4 is subjected to a torsion force, the front end of the rear linkage member always has an upward rotating trend around the hinged shaft of the rear linkage member and the hinged shaft of the rear foot rod, and therefore after the stroller frame is unlocked, the front end of the rear linkage member can be automatically turned upwards by the torsion force of the torsion spring, the rear end of the front linkage member is also turned upwards, the front foot rod and the rear foot rod are correspondingly pulled to be relatively close, and the stroller frame is automatically folded.

When the elastic member 10 is a torsion spring and is disposed at the hinged position of the front linkage member 4 and the rear linkage member 5, two ends of the torsion spring respectively act on the rear end of the front linkage member 4 and the front end of the rear linkage member 5, so that the front linkage member 4 and the rear linkage member 5 are both subjected to torsion, and the front end of the rear linkage member and the rear end of the front linkage member 4 always have a tendency of turning upwards, so that after the stroller frame is unlocked, the front end of the rear linkage member and the rear end of the front linkage member 4 can be automatically turned upwards by the torsion of the torsion spring, and the front foot bar and the rear foot bar are correspondingly pulled to be relatively close to each other, thereby realizing automatic folding of the stroller frame.

Claims

1. A cart frame is characterized by comprising a front foot rod (1), a rear foot rod (2), a push rod (3), a front linkage piece (4), a rear linkage piece (5), a folding pull rope (6) and a push rod (7);

the lower end of the front foot rod (1) is provided with a front wheel assembly (11), and the lower end of the rear foot rod (2) is provided with a rear wheel assembly (21);

the upper end of the rear foot rod (2) is rotatably connected with the upper end of the front foot rod (1), the lower end of the push rod (3) is rotatably connected with the upper end of the rear foot rod (2), the front end of the front linkage piece (4) is hinged with the front foot rod (1), the rear end of the front linkage piece (4) is hinged with the front end of the rear linkage piece (5), and the rear end of the rear linkage piece (5) is hinged with the rear foot rod (2);

the upper end of the folding stay cord (6) is connected to the lower end of the push rod (3) and is eccentric to a rotating shaft connected with the push rod (3) and the rear foot bar (2), the lower end of the folding stay cord (6) is connected to the rear end of the front linkage piece (4), or connected to the front end of the rear linkage piece (5), or connected to a hinged shaft of the front linkage piece (4) and the rear linkage piece (5), so that when the push rod (3) is turned over downwards, the folding stay cord (6) pulls the front linkage piece (4) and the rear linkage piece (5) to enable the front foot bar (1) and the rear foot bar (2) to be relatively drawn together for folding;

the ejector rod (7) is connected to the front foot rod (1) in a sliding mode, when the frame of the cart is unfolded, the upper end of the ejector rod (7) is limited and abutted by the lower end of the push rod (3), and the lower end of the ejector rod (7) is abutted against the front portion of the front linkage piece (4) to limit the front end of the front linkage piece (4) to rotate around a hinge shaft of the front linkage piece and the front foot rod (1);

a locking mechanism (8) is arranged between any two of the lower end of the push rod (3), the upper end of the front foot rod (1) and the upper end of the rear foot rod (2) to lock the state of the cart frame when the cart frame is unfolded.

2. A stroller frame according to claim 1, wherein said front leg bar (1) is provided with a guide sliding sleeve (71), and said top bar (7) is slidably connected to said guide sliding sleeve (71).

3. A stroller frame according to claim 1 or 2, characterized in that the lower end of the push rod (7) is hinged to the front part of the front linkage member (4).

4. The cart frame according to claim 1, wherein the lower end of the push rod (3) is relatively and fixedly connected with a turning seat (31), the turning seat (31) is provided with a seat frame connecting seat (32) which moves along with the turning seat, the turning seat (31) is hinged with the upper end of the rear foot rod (2), and the turning seat (31) is provided with a pressing surface (311) for pressing the upper end of the push rod (7).

5. A stroller frame according to claim 1 or 4, further comprising a handle bar (33), wherein the lower end of the handle bar (33) is telescopically slidably connected to the push rod (3).

6. A stroller frame according to claim 5, wherein the locking mechanism (8) is disposed between the lower end of the push rod (3) and the upper end of the front leg (1), and when the handle bar (33) slides downward relative to the push rod (3), the lower end of the handle bar (33) triggers the locking mechanism (8) to unlock the push rod (3), so that the push rod (3) can be folded downward relative to the rear leg (2).

7. A stroller frame according to claim 6, wherein the locking mechanism (8) comprises a locking hole (81) directly or indirectly formed at the lower end of the push rod (3) and a locking tongue (82) disposed at the upper end of the front leg bar (1) and elastically stretchable, and when the stroller frame is unfolded, the locking tongue (82) is elastically inserted into the locking hole (81) to limit the push rod (3) from being folded downward relative to the rear leg bar (2); when the handle rod (33) slides downwards and retracts into the push rod (3), the lower end of the handle rod (33) directly or indirectly pushes the bolt (82) out of the lock hole (81) to release the locking state of the push rod (3), so that the push rod (3) can be turned downwards.

8. The stroller frame according to claim 1, 2, 4, 6 or 7, further comprising an elastic member (10), wherein the elastic member (10) is a compression spring and is disposed on the front leg rod (1), and the upper end and the lower end of the elastic member (10) are respectively elastically pressed against the top rod (7) and the front leg rod (1);

or the elastic part (10) is a torsion spring and is arranged at the hinged part of the front foot rod (1) and the front linkage part (4);

or the elastic part (10) is a torsion spring and is arranged at the hinged part of the rear foot rod (2) and the rear linkage part (5);

or the elastic part (10) is a torsion spring and is arranged at the hinged part of the front linkage part (4) and the rear linkage part (5).

9. A cart frame is characterized by comprising a front foot rod (1), a rear foot rod (2), a push rod (3), a front linkage piece (4), a rear linkage piece (5), a push rod (7) and an elastic piece (10);

the elastic piece (10) is a compression spring and is arranged on the front foot rod (1), and the upper end and the lower end of the elastic piece (10) are respectively and elastically pressed against the ejector rod (7) and the front linkage piece (4); or the elastic part (10) is a torsion spring and is arranged at the hinged part of the front foot rod (1) and the front linkage part (4); or the elastic part (10) is a torsion spring and is arranged at the hinged part of the rear foot rod (2) and the rear linkage part (5); or the elastic part (10) is a torsion spring and is arranged at the hinged part of the front linkage part (4) and the rear linkage part (5);