CN114954611B

CN114954611B - Foldable trolley

Info

Publication number: CN114954611B
Application number: CN202110220481.7A
Authority: CN
Inventors: 范建华; 马聪泉; 赵国松
Original assignee: Bulanxin International Trading Co; Ch Baby Co ltd
Current assignee: Bulanxin International Trading Co; Ch Baby Co ltd
Priority date: 2021-02-26
Filing date: 2021-02-26
Publication date: 2025-06-03
Anticipated expiration: 2041-02-26
Also published as: CN114954611A

Abstract

The present invention discloses a foldable trolley, comprising a foldable frame and wheels installed at the bottom of the frame, the frame having a relative transverse and longitudinal direction, and the frame comprising two side frames arranged oppositely and a transverse connecting member connected between the two side frames, the two side frames and the transverse connecting member as a whole form a cage-shaped structure with an open top, the interior of the cage-shaped structure is a load-bearing area; the side frame adopts a foldable four-bar linkage, in the unfolded state, four rods are hinged in sequence, two of which are horizontally placed and at the bottom edge of the side frame, and the other two rods extend upward, intersect and are hinged to each other; in the folded state, the rods in the four-bar linkage are gathered together. Compared with the existing trolleys, the cage-shaped structure for carrying children or loading articles is modified below the original seat position to improve the storage capacity, and only one four-bar linkage is provided, which has a simple structure and is stable and reliable.

Description

Foldable handcart

Technical Field

The application relates to the technical field of child carriers, in particular to a high-capacity foldable trolley.

Background

The child cart is a carrier for carrying children and accessories indoors or outdoors, and is generally only provided with a seat in a matched manner to carry one child or increase the length or width of the child cart, and two seats are configured to realize double carrying, wherein the seats can be arranged front and back along the length direction or left and right along the width direction, most of the child carts cannot be folded, and the partially foldable child carts are required to be folded and stored after being disassembled.

Or for example, the chinese patent document with publication number CN 105857379A discloses a double-person cart, in which two seats are arranged in parallel along the width direction, and a plurality of link mechanisms are configured to realize folding of the frame, so that the structure is complex, the folding is not smooth, and folding jamming occurs seriously.

Disclosure of Invention

The application provides a foldable large-capacity handcart, which solves the problems of complex folding structure and small article loading capacity of the conventional handcart.

The foldable trolley comprises a foldable trolley frame and wheels arranged at the bottom of the trolley frame, wherein the trolley frame is provided with opposite transverse and longitudinal directions, the trolley frame comprises two side frames which are arranged oppositely and transverse connecting pieces connected between the two side frames, the two side frames and the transverse connecting pieces integrally enclose a cage-shaped structure with an open top, and the interior of the cage-shaped structure is a bearing area;

The side frame adopts a foldable four-bar mechanism, in an unfolding state, four bars are hinged in sequence, two bars are horizontally arranged and positioned at the bottom edge of the side frame, the other two bars extend upwards to intersect and are hinged with each other, and in a folding state, each bar in the four-bar mechanism is gathered with each other.

The following provides several alternatives, but not as additional limitations to the above-described overall scheme, and only further additions or preferences, each of which may be individually combined for the above-described overall scheme, or may be combined among multiple alternatives, without technical or logical contradictions.

Optionally, an inner bag with an open top for loading children or articles is arranged in the cage-shaped structure.

Optionally, the transverse connection piece includes the articulated side fender that is in the longitudinal both sides of frame and arranges in many cross braces of side bearer bottom, interior pocket is hung or is overlapped establish on the side fender and collet in on the cross brace.

Optionally, the bottom of frame is dodged the space in the middle part region of longitudinal, interior pocket is provided with dodge the corresponding subsidence district in space position.

Optionally, the side frame includes a front diagonal brace, a rear diagonal brace, a front vertical brace, and a rear vertical brace, wherein the tops of the front diagonal brace and the rear diagonal brace are hinged to a first rotating joint, one ends of the front vertical brace and the rear vertical brace are hinged to a second rotating joint, the other end of the front vertical brace is hinged to the bottom of the front diagonal brace, and the other end of the rear vertical brace is hinged to the bottom of the rear diagonal brace;

in the unfolding state, the front longitudinal supporting rod and the rear longitudinal supporting rod are horizontally arranged;

in the folded state, the first rotating joint and the second rotating joint are close to each other.

Optionally, the first rotating joint swings and installs the handle pole, the handle pole is scalable or fold up.

Optionally, the front vertical supporting rod and the rear vertical supporting rod are coplanar, the front inclined supporting rod and the rear inclined supporting rod are coplanar, the front vertical supporting rod is positioned on the inner side opposite to the front inclined supporting rod, and the four rod pieces form a triangular frame.

Optionally, a locking device for keeping the four-bar mechanism in an unfolding state is arranged at the second rotary joint, and an unlocking device for releasing the lock is arranged on the transverse connecting piece.

Optionally, the locking device includes a locking groove provided on one of the front and rear vertical support rods, a locking pin slidably mounted on the other of the front and rear vertical support rods, and a first elastic member for urging the locking pin to extend into the locking groove.

Optionally, the unlocking device comprises an unlocking piece which is slidably mounted on the transverse connecting piece, a second elastic piece for promoting the unlocking piece to reset, and a stay wire with one end fixed on the unlocking piece and the other end fixed on the locking pin, wherein the stay wire is used for promoting the locking pin to slide along with the unlocking piece to exit the locking groove.

Compared with the traditional handcart, the foldable handcart provided by the application has the cage-shaped structure for carrying a plurality of children or loading a large amount of articles under the condition of the same volume, so that the storage capacity is improved, the volume after folding is kept unchanged basically, and the foldable handcart has a simple structure for folding and is smooth in folding.

Drawings

FIG. 1 is a perspective view of a collapsible cart in accordance with an embodiment of the application;

FIG. 2 is an exploded view of the structure at a second revolute joint in a foldable wagon according to one embodiment of the present application;

FIG. 3 is a schematic view of a portion of a rear vertical trunk of a foldable wheelbarrow according to one embodiment of the present application;

FIG. 4 is a locked state view of the locking device in the foldable wagon according to an embodiment of the present application;

FIG. 5 is an unlocked view of the locking device in the foldable wagon according to an embodiment of the present application;

FIG. 6 is a view showing the folding of the front and rear longitudinal rails of a foldable wheelbarrow according to one embodiment of the present application;

FIG. 7 is a structural view of an unlocking device in a foldable wagon according to an embodiment of the present application;

FIG. 8 is an unlocking operation view of FIG. 7;

FIG. 9 is a transverse perspective expanded view of a collapsible cart according to an embodiment of the application;

FIG. 10 is a collapsed view of a basket in a collapsible cart in accordance with an embodiment of the present application;

FIG. 11 is a side view of a collapsible cart in accordance with an embodiment of the present application;

FIG. 12 is a collapsed view of a handlebar of a collapsible cart in accordance with an embodiment of the present application;

FIG. 13 is a collapsed view of a four bar linkage in a collapsible cart according to an embodiment of the application;

FIG. 14 is a view of a collapsed condition of a collapsible cart according to an embodiment of the application;

fig. 15 is a view of the structure of an adapter in a collapsible cart in accordance with an embodiment of the application.

Reference numerals in the drawings are described as follows:

1. The device comprises a side frame, an inner pocket, a transverse connecting piece, expanding equipment, a handle bar and a handle bar, wherein the side frame is provided with a transverse connecting piece;

11. A carrying area; 12 parts of sinking area, 13 parts of front diagonal brace, 14 parts of rear diagonal brace, 15 parts of front longitudinal brace;

16. a rear vertical supporting rod; 17, a first rotary joint, 18, a second rotary joint, 31, a side block, 32 and a transverse supporting rod;

33. The basket 41, the front wheel 42, the rear wheel 61, the lower handle bar 62, the upper handle bar;

171. the device comprises an adapter seat, 181, a locking groove, 182, a locking pin, 183, a first elastic piece, 321 and an unlocking piece;

322. The second elastic piece 323, a stay wire 331, a supporting frame 332 and a basket body.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In the present disclosure, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or as implicitly indicating the number, order of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

The application provides a foldable handcart, which comprises a foldable frame and wheels arranged at the bottom, wherein the whole handcart is provided with an unfolding state for bearing movement of children and a folding state folded into a plate shape, the wheels comprise front wheels and rear wheels for the movement of the handcart, the front wheels are universal wheels for steering operation, and the rear wheels are directional wheels. The frame has opposite transverse and longitudinal directions, which are defined as directions in which the front and rear wheels are connected, and transverse directions are perpendicular to the longitudinal directions, unless otherwise specified.

Referring to fig. 1, 9-14, in one embodiment, the frame includes two side frames 1 disposed opposite to each other and a transverse connecting member 3 connecting the two side frames 1, and the two side frames 1 and the transverse connecting member 3 integrally enclose an open-top cage structure, and a carrying area 11 for carrying children or articles is formed inside the cage structure. Wherein the cross-connect 3 generally comprises a reinforcing bar as a cage structure and other bars surrounding the cage structure with the side frames 1.

The side frame 1 adopts a foldable four-bar mechanism, in an unfolding state, four bars are hinged with each other in sequence, two bars are horizontally arranged and positioned at the edge of the bottom of the frame, and are connected with part of bars in the transverse connecting piece 3 to be used as a bottom frame for supporting the cage-shaped structure. The other two rods in the four-bar mechanism extend upwards obliquely and are mutually hinged, and are connected with part of the rods in the transverse connecting piece 3 to form a round of frame around the cage-shaped structure.

The whole cage-shaped structure is in a cuboid shape, the top of the cage-shaped structure is open, at least two children can be placed in the bearing area 11, and the four rod pieces are in a triangular structure, so that the strength of the whole frame is improved. In the folded state, the two horizontally arranged rods relatively rotate and draw close to each other, the rods which are obliquely arranged are driven to rotate and draw close, and the four-bar mechanism is finally folded, so that the folding is convenient.

Compared with the existing handcart with a seat, the foldable handcart has the advantages that the area for bearing children is arranged at the bottom of the original seat position, the longest distance of a frame is fully utilized, a cage-shaped structure with larger capacity is formed by matching with transverse connecting pieces, at least two children can be born or a large amount of articles can be loaded, the energy storage capacity of the handcart is improved, the four-bar mechanism of the side frame can be folded, the frame is driven to be integrally folded, and the handcart is convenient to carry when going out. Compared with the existing double trolley which is transversely folded, the folding trolley is simple in structure and smooth in folding.

Referring again to fig. 9, in one embodiment, an open-top inner pocket 2 for carrying a child or article is provided within the cage structure to protect the child and article within the cage structure from falling out of the frame and to make the child more comfortable within the cage structure. The inner pocket 2 can deform and fold synchronously with the frame, and is convenient for folding and storing compared with the traditional large-capacity handcart with the seat to be disassembled.

Referring again to fig. 1 and 9, in one embodiment, the cross member 3 includes side rails 31 hinged to both sides of the longitudinal direction of the frame, and a plurality of cross rods 32 arranged at the bottom of the side frames, wherein the side rails 31 and the side frames 1 form a frame with a cage-like structure and the cross rods 32 and the side frames 1 form a supporting frame with a cage-like structure. The inner bag 2 is hung or sleeved on the side baffle 31 and is supported on the transverse supporting rod 32, so that the supporting strength of the inner bag 2 is ensured, children can conveniently move inside the inner bag, and the structural strength of high-capacity loaded articles is ensured. In one embodiment, the bottom of the frame is in a longitudinal middle area for avoiding space, the inner bag 2 is provided with a sinking area 12 corresponding to the avoiding space, the sinking area 12 is used for placing feet of children, comfort of the children is guaranteed when the children bear the weight of the inner bag, if the flatness of the bottom of the bearing area 11 is required to be kept, the structure of the inner bag 2 can be adjusted, for example, a whole pad (not shown) is additionally arranged, and the inner bag is convenient for the children to move.

As shown in fig. 9 to 14, in one embodiment, the side frame 1 includes a front diagonal brace 13, a rear diagonal brace 14, a front vertical brace 15, and a rear vertical brace 16, wherein the tops of the front diagonal brace 13 and the rear diagonal brace 14 are hinged to a first pivot joint 17, one ends of the front vertical brace 15 and the rear vertical brace 16 are hinged to a second pivot joint 18, the other ends of the front vertical brace 15 are hinged to the bottom of the front diagonal brace 13, and the other ends of the rear vertical brace 16 are hinged to the bottom of the rear diagonal brace 14. The revolute joint described in this embodiment has two parts rotatably connected to each other, each of which may be independent of the rod member or may be part of the rod member, and is not limited to the form shown in the drawings.

In the unfolded state, the front vertical supporting rod 15 and the rear vertical supporting rod 16 are horizontally arranged to form a flat rectangular supporting frame with the transverse supporting rod 32, and in the folded state, the first rotating joint 17 and the second rotating joint 18 are adjacent to each other, specifically, the front vertical supporting rod 15 and the rear vertical supporting rod 16 relatively rotate, the second rotating joint 18 moves upwards, the front inclined supporting rod and the rear inclined supporting rod are pulled to rotate around the first rotating joint 17 and are close, and finally the folding is realized.

Referring to fig. 9 to 14 again, in one embodiment, the front vertical supporting rod 15 and the rear vertical supporting rod 16 are coplanar, the front diagonal supporting rod 13 and the rear diagonal supporting rod 14 are coplanar, the front vertical supporting rod 15 is located at the opposite inner sides of the front diagonal supporting rod 13, and in the unfolded state, four rods form a triangular frame, so that the structural strength of the frame is improved. At least one longitudinal supporting rod is overlapped with the corresponding diagonal supporting rod under the transverse view angle of the folded state, so that the front diagonal supporting rod and the rear diagonal supporting rod can be further closed, and the folded volume is reduced. In the preferred embodiment, the bottom of the frame is provided with a front wheel 41 and a rear wheel 42 for moving the frame, the front wheel 41 and the rear wheel 42 are transversely staggered, and the front wheel 41 and the rear wheel 42 are partially or completely overlapped when being folded under the transverse view angle, so that the volume of the folded frame is further reduced.

Referring to fig. 2 to 9, in one embodiment, a locking device for maintaining the four-bar mechanism in an unfolded state is disposed at the second rotation joint 18, and an unlocking device for unlocking is disposed on the transverse connector 3. The locking device comprises a locking groove 181, a locking pin 182 and a first elastic member 183, wherein the locking groove 181 is formed on one or both of the front vertical supporting rod 15 and the rear vertical supporting rod 16, the locking pin 182 is slidably mounted on the other of the front vertical supporting rod 15 and the rear vertical supporting rod 16, and in this embodiment, the front vertical supporting rod and the rear vertical supporting rod are respectively formed with the locking groove 181 and are mutually overlapped in the unfolded state. The first elastic member 183 urges the lock pin 182 to extend into the lock groove 181 and has:

In the locked state, the locking pin 182 extends into the locking groove 181 by means of the first elastic piece 183, and the relative rotation of the front and rear longitudinal support rods is limited;

In the unlocking state, the locking pin 182 is withdrawn from the locking groove 181, and the front and rear longitudinal support rods can rotate relatively.

The unlocking device comprises an unlocking piece 321, a second elastic piece 322 and a pull wire 323, wherein the unlocking piece 321 is arranged on the transverse supporting rod 32, and two ends of the pull wire 323 are respectively connected with the unlocking piece 321 and the locking pin 182 and are not extensible. The specific unlocking operation is that the unlocking piece 321 is moved in a sliding way, the locking pin 182 is pulled by the pull wire 323 to withdraw from the locking groove 181, after the front and rear longitudinal pulling rods relatively rotate, the pressing of the unlocking piece 321 is released, and the second elastic piece 322 and the first elastic piece 183 respectively drive the corresponding unlocking piece 321 and the locking pin 182 to reset, so that unlocking is completed.

Referring to fig. 15, in one embodiment, the first rotary joint 17 is provided with an adapter 171, and the adapter 171 is detachably inserted and matched with an expansion device 5, where the expansion device 5 may be any accessory capable of interacting with children, such as a seat, a dinner plate or a drawing board, or may be a retractable plate, so as to cover the top of the cage structure, protect privacy or play a role in preventing rain and sun. The detachably connected expansion device of the handcart is matched with the cage-shaped structure to realize the switching of multiple functions.

Referring to fig. 1 and 11, in order to reduce the volume of the whole vehicle as much as possible, in one embodiment, the side rail 31 is a U-shaped frame formed by bending pipe or assembling a plurality of pipe, the two open ends are hinged on the side frame 1, and the closed end faces upwards for the inner bag 2 to hoist and loop. The side rail 31 is positioned at the opposite inner side of the side frame 1, and in a folded state of the lateral view, the side rail 31 is overlapped with the side frame 1, so that the volume of the folded frame is reduced.

Referring to fig. 1, 9 and 10 again, in one embodiment, at least one side rail 31 is provided with a basket 33 for loading articles, and in a preferred embodiment, the basket 33 and the side rail 31 are movably mounted, which is beneficial to reducing the folding volume. The basket 33 comprises in detail a rigid support frame 331 hinged to the side rail 31, and a deformable basket body 332. The supporting frames 331 are located at opposite inner sides of the side rails 31, and overlap each other in a folded state of the lateral view angle, so that the corresponding basket 332 can be deformed and folded synchronously, and the carrying capacity of the article is improved, and meanwhile, the volume of the folded whole vehicle is kept unchanged.

Referring back to fig. 1, 9 and 10, in one embodiment, the first rotating joint 17 is disposed in the middle and is provided with the handle bar 6 in a swinging manner, and in the folded state, each rod piece in the four-bar mechanism and the handle bar 6 are gathered together, and the handle bar 6 can be synchronously folded by linking with one rod piece in the four-bar mechanism through the connecting rod, or can be independently folded. The handle bar 6 is obliquely arranged with the horizontal plane in the unfolded state, so that the force can be effectively transmitted to the bottom of the frame, and the cart is convenient to operate and control. And the handle bar and the side frame have only one connecting part, so that the height of the side frame is allowed to be reduced compared with that of the side frame in the traditional structure, and the frame is more exquisite and concise.

In one embodiment, the handle bar 6 is a straight bar under the transverse view angle, and the handle bar 6 forms an included angle alpha with the longitudinal direction of the frame, the included angle alpha satisfies 45 degrees < alpha <60 degrees, the pushing is convenient, and the inclined bar is inclined in the same direction with one of the inclined bars, so that the appearance is simple. In the preferred embodiment, the handlebar 6 is collinear with an inclined strut, which provides a more compact appearance and efficient transfer of forces to the wheels for steering operations.

In one embodiment, the handle bar 6 includes a lower handle bar 61 and an upper handle bar 62 slidably mounted on the lower handle bar 61, wherein the upper handle bar 62 is slidably sleeved inside the lower handle bar 61 or slidably sleeved outside the lower handle bar 61, so as to facilitate child caregivers of different heights.

According to the large-capacity handcart disclosed by the application, the function of a child bearing seat is transferred to the bottom of the frame, and the side stops, the side frames and the transverse supporting rods are arranged to form a cage-shaped structure for bearing or loading children, so that the longest distance of the frame is effectively utilized, the utilization rate in the height direction is improved, and under the condition of the same frame, the large capacity is obtained, and at least two children can be borne.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description. When technical features of different embodiments are embodied in the same drawing, the drawing can be regarded as a combination of the embodiments concerned also being disclosed at the same time.

The foregoing examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application.

Claims

1. The foldable handcart comprises a foldable frame and wheels arranged at the bottom of the frame, and is characterized in that the frame is provided with opposite transverse and longitudinal directions, the frame comprises two side frames which are arranged oppositely and transverse connecting pieces connected between the two side frames, the transverse connecting pieces comprise side stops hinged at two longitudinal sides of the frame and a plurality of transverse supporting rods arranged at the bottom of the side frames, the two side frames and the transverse connecting pieces integrally enclose a cage-shaped structure with an open top, the interior of the cage-shaped structure is a bearing area, and an inner pocket with the open top and used for loading children or articles is arranged in the cage-shaped structure;

The side frame adopts a foldable four-bar mechanism, in an unfolding state, four bars are hinged in sequence, wherein two bars are horizontally arranged and positioned at the bottom edge of the side frame, and the other two bars extend upwards to intersect and are hinged with each other; in a folding state, rods in the four-bar mechanism are gathered together, wherein the side frame comprises a front inclined strut, a rear inclined strut, a front longitudinal strut and a rear longitudinal strut, the tops of the front inclined strut and the rear inclined strut are hinged to a first rotating joint, one ends of the front longitudinal strut and the rear longitudinal strut are hinged to a second rotating joint, the other ends of the front longitudinal strut are hinged to the bottom of the front inclined strut, and the other ends of the rear longitudinal strut are hinged to the bottom of the rear inclined strut;

In the unfolding state, the front longitudinal supporting rods and the rear longitudinal supporting rods are horizontally arranged, and the four rod pieces form a triangular frame;

2. The collapsible cart of claim 1, wherein said inner pocket is hung or sleeved on said side stops and is supported on said cross bar.

3. The foldable wagon of claim 1, wherein the bottom of the wagon frame is provided with an avoidance space in a longitudinal middle region, and the inner pocket is provided with a sinking region corresponding to the position of the avoidance space.

4. The foldable wagon of claim 1, wherein the first swivel joint is pivotally mounted with a handle bar, the handle bar being telescopic or collapsible.

5. The collapsible cart of claim 1 wherein said front and rear longitudinal struts are coplanar, said front diagonal strut and said rear diagonal strut are coplanar, said front longitudinal strut being on opposite inner sides of said front diagonal strut.

6. The foldable wagon of claim 1, wherein the second pivot joint is provided with a locking device for holding the four bar linkage in an unfolded state, and wherein the transverse connector is provided with an unlocking device for releasing the lock.

7. The collapsible cart of claim 6, wherein the locking means comprises a locking slot provided in one of the front and rear longitudinal rails, a locking pin slidably mounted on the other of the front and rear longitudinal rails, and a first resilient member urging the locking pin into the locking slot.

8. The foldable wagon of claim 7, wherein the unlocking means comprises an unlocking member slidably mounted on the transverse connector, a second elastic member urging the unlocking member to return, and a wire having one end fixed to the unlocking member and the other end fixed to the locking pin, the wire being adapted to urge the locking pin to slide with the unlocking member out of the locking groove.