CN114954611A - Foldable trolley - Google Patents

Abstract

The invention discloses a foldable trolley, which comprises a foldable trolley frame and wheels arranged at the bottom of the trolley frame, wherein the trolley frame is provided with a transverse direction and a longitudinal direction which are opposite, the trolley frame comprises two side frames which are oppositely arranged and a transverse connecting piece connected between the two side frames, the two side frames and the transverse connecting piece are integrally enclosed to form a cage-shaped structure with an open top, and a bearing area is arranged inside the cage-shaped structure; the side frame adopts a foldable four-bar linkage mechanism, and in an unfolded state, four rod pieces are sequentially hinged, wherein two rod pieces are horizontally arranged and positioned at the bottom edge of the side frame, and the other two rod pieces extend upwards to intersect and are hinged with each other; under the folding state, all the rod pieces in the four-bar mechanism are gathered together. Compared with the existing handcart, the handcart has the advantages that a cage-shaped structure for bearing children or loading articles is modified below the original seat position so as to improve the storage capacity, and only one four-bar mechanism is arranged, so that the handcart is simple in structure, stable and reliable.

Description

foldable trolley

technical field

The present application relates to the technical field of children's vehicles, in particular to a large-capacity foldable trolley.

Background technique

A child stroller is a vehicle used to carry children and accessories indoors or outdoors. Generally, only a seat is installed to carry a child or to increase the length or width of the stroller, and two seats are configured to achieve double The seat can be arranged forward and backward along the length direction or left and right along the width direction, and most of these strollers cannot be folded, and some of the foldable strollers need to be disassembled and then folded for storage.

Or for example, the existing Chinese patent document with the publication number of CN 105857379 A discloses a double stroller, in which two seats are arranged in parallel along the width direction, and a plurality of link mechanisms are arranged to realize the folding of the frame, and the structure is complex. , the folding is not smooth, and the folding jam occurs seriously.

SUMMARY OF THE INVENTION

The present application provides a foldable large-capacity trolley, which solves the problems of the existing trolley having a complicated folding structure and a small loading capacity of articles.

A foldable trolley includes a foldable frame and wheels mounted on the bottom of the frame, the frame has opposite lateral and longitudinal directions, and the frame includes two side frames arranged oppositely and connected on the two sides The transverse connecting piece between the frames, the two side frames and the transverse connecting piece as a whole enclose a cage-shaped structure with an open top, and the inside of the cage-shaped structure is a bearing area;

The side frame adopts a foldable four-bar linkage mechanism. In the unfolded state, the four rods are hinged in sequence, two of which are flat and located at the bottom edge of the side frame, and the other two rods extend upward and intersect and are hinged to each other. ; In the folded state, the rods in the four-bar linkage mechanism are gathered together.

Several optional methods are also provided below, which are not intended to be additional limitations on the above-mentioned overall solution, but are merely further additions or optimizations. On the premise of no technical or logical contradiction, each optional method can be independently implemented for the above-mentioned overall solution. The combination can also be a combination between multiple optional ways.

Optionally, an inner pocket with an open top for carrying children or objects is provided in the cage structure.

Optionally, the transverse connecting piece includes side blocks hinged on both longitudinal sides of the frame and a plurality of transverse brace bars arranged at the bottom of the side frames, and the inner pocket is hung or sleeved on the side blocks. and the bottom is supported on the horizontal support rod.

Optionally, the bottom of the frame is an avoidance space in the longitudinal middle region, and the inner pocket is provided with a sinking area corresponding to the position of the avoidance space.

Optionally, the side frame includes a front diagonal brace, a rear diagonal brace, a front vertical brace, and a rear vertical brace, and the tops of the front brace and the rear brace are hinged to the first pivot joint, One end of the front vertical support rod and the rear vertical support rod is hinged to the second rotation joint, the other end of the front vertical support rod is hinged to the bottom of the front diagonal support rod, and the other end of the rear vertical support rod is hinged at the bottom of the rear diagonal strut;

In the unfolded state, the front longitudinal support rod and the rear longitudinal support rod are flat;

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

Optionally, a handle bar is oscillatingly installed on the first rotating joint, and the handle bar is retractable or retractable.

Optionally, the front vertical support rod and the rear vertical support rod are coplanar, the front diagonal support rod and the rear diagonal support rod are coplanar, and the front vertical support rod is located on the opposite inner side of the front diagonal support rod , the four rods form a triangular frame.

Optionally, a locking device for keeping the four-bar linkage mechanism in a deployed state is provided at the second rotating joint; an unlocking device for releasing the locking is provided on the transverse connecting member.

Optionally, the locking device includes a locking groove provided on one of the front vertical support rod and the rear vertical support rod, and a locking pin slidably installed on the other of the front vertical support rod and the rear vertical support rod. , and a first elastic member that urges the locking pin to extend into the locking groove.

Optionally, the unlocking device comprises an unlocking member slidably mounted on the transverse connecting member, a second elastic member for urging the unlocking member to reset, and a pulling wire fixed on the unlocking member at one end and on the locking pin at the other end, The pulling wire is used for urging the locking pin to slide out of the locking groove along with the unlocking member.

Compared with the traditional trolley, the foldable trolley of the present application has a cage structure for carrying a plurality of children or a large number of items under the condition of the same volume, which improves the storage capacity and can keep the folded volume basically. Remaining unchanged, the structure for folding is simple and the folding is smooth.

Description of drawings

FIG. 1 is a perspective view of a foldable trolley according to an embodiment of the application;

FIG. 2 is an exploded view of the structure at the second pivot joint in the foldable trolley according to an embodiment of the application;

FIG. 3 is a partial structural schematic diagram of a rear vertical support trunk in a foldable trolley according to an embodiment of the application;

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

FIG. 5 is an unlocked state view of a locking device in a foldable trolley according to an embodiment of the application;

6 is a folded view of the front vertical support rod and the rear vertical support rod in the foldable handcart according to an embodiment of the application;

7 is a structural view of an unlocking device in a foldable trolley according to an embodiment of the application;

Fig. 8 is the unlocking operation view of Fig. 7;

FIG. 9 is an expanded view of a foldable trolley from a lateral perspective according to an embodiment of the application;

10 is a folded view of a foldable trolley middle storage basket according to an embodiment of the application;

FIG. 11 is a folded view of the middle side shield of the foldable trolley according to an embodiment of the application;

FIG. 12 is a folded view of a handle bar in a foldable trolley according to an embodiment of the application;

FIG. 13 is a collapsed view of the four-bar linkage mechanism in the foldable trolley according to an embodiment of the application;

FIG. 14 is a folded state view of the foldable trolley according to an embodiment of the application;

FIG. 15 is a structural view of an adapter in a foldable cart according to an embodiment of the application.

The reference numerals in the figure are explained as follows:

1. Side frame; 2. Inner pocket; 3. Transverse connector; 5. Expansion equipment; 6. Handlebar;

11. Bearing area; 12. Sinking area; 13. Front diagonal strut; 14. Rear diagonal strut; 15. Front longitudinal brace;

16. Rear vertical support rod; 17. First rotating joint; 18. Second rotating joint; 31. Side stop; 32. Horizontal support rod;

33, storage basket; 41, front wheel; 42, rear wheel; 61, lower handle bar; 62, upper handle bar;

171, adapter seat; 181, locking groove; 182, locking pin; 183, first elastic piece; 321, unlocking piece;

322, the second elastic member; 323, the pull wire; 331, the support frame; 332, the basket body.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

It should be noted that when a component is referred to as being "connected" to another component, it can be directly connected to the other component or an intervening component may also exist. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a co-existing centered component.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the present application are for the purpose of describing specific embodiments only, and are not intended to limit the present application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In this application, the terms "first", "second", etc. are only used for descriptive purposes, and should not be understood as indicating or implying relative importance or implying the number and order of the indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

The present application provides a foldable trolley, which includes a foldable frame and wheels mounted on the bottom. The whole vehicle has an unfolded state for carrying children to move and a folded state that is folded into a plate shape. The wheels include front wheels and rear wheels. , for the trolley to move, among which, the front wheel is generally a universal wheel, which is used for steering operation, and the rear wheel is a directional wheel. The frame has relative transverse and longitudinal directions. The longitudinal and transverse directions mentioned in the following embodiments are defined as the direction of the connection line between the front and rear wheels, and the transverse direction is perpendicular to the longitudinal direction unless otherwise specified.

Please refer to FIG. 1, FIG. 9 to FIG. 14, in one embodiment, the vehicle frame includes two side frames 1 arranged opposite to each other and a transverse connecting member 3 connecting the two side frames 1, the two side frames 1 and The transverse connecting member 3 as a whole encloses a cage-shaped structure with an open top, and the interior of the cage-shaped structure is a carrying area 11 for carrying children or articles. The transverse connecting member 3 generally includes a reinforcing rod as a cage-shaped structure and other rod members that are enclosed with the side frame 1 to form a cage-shaped structure.

The side frame 1 adopts a foldable four-bar linkage mechanism. In the unfolded state, the four rods are hinged to each other in sequence, and two of the rods are flat and located at the edge of the bottom of the frame, and are connected with the horizontal connecting member 3. Parts of the rods are connected as the bottom frame supporting the cage structure. The other two rods in the four-bar linkage mechanism extend upwards and are hinged with each other, and are connected with part of the rods in the transverse connecting member 3 as a frame around the cage structure.

The whole cage structure is in the shape of a cuboid, and the top is open, so that at least two young children can be placed in the bearing area 11 , and the four rods are in a triangular structure, which improves the strength of the overall frame. In the folded state, the two horizontal rods rotate relative to each other and move closer to each other, drive the inclined rods to rotate and move closer, and the four-bar linkage is finally folded, which is convenient for storage.

The foldable trolley of the present application has a shape and volume close to the existing single-person trolley. Compared with the existing trolley with a seat, the area for carrying children is arranged at the bottom of the original seat position, and the frame is fully utilized. The longest distance of the trolley can be combined with the transverse connection to form a large-capacity cage structure, which can carry at least two young children or load a large number of items, which improves the storage capacity of the trolley, and the four-bar linkage mechanism of the side frame can be folded to drive the trolley. The stand is folded as a whole for easy carrying. Compared with the existing horizontally folded double trolley, the structure is simple and the folding is smooth.

Please refer to FIG. 9 again, in one embodiment, an inner pocket 2 with an open top for carrying children or objects is provided in the cage structure, so as to protect the children and objects in the cage structure from falling out of the frame, and Make the child more comfortable in the cage structure. The inner pocket 2 can be deformed and folded synchronously with the frame. Compared with the traditional large-capacity trolley that needs to remove the seat, it is easy to fold and store.

Please refer to FIG. 1 and FIG. 9 again. In one embodiment, the transverse connecting member 3 includes side blocks 31 hinged on both sides of the frame in the longitudinal direction and a plurality of transverse brace bars 32 arranged at the bottom of the side frame. The side blocks 31 The side frame 1 and the side frame 1 form a frame with a circle around the cage structure, and the transverse struts 32 and the side frame 1 form a support frame of the cage structure. The inner pocket 2 is hung or sleeved on the side block 31 and the bottom is supported on the horizontal support rod 32, which ensures the support strength of the inner pocket 2, facilitates the movement of children inside, and ensures the structural strength of large-capacity loaded items. In one embodiment, the bottom of the frame in the longitudinal middle area is an avoidance space, and the inner pocket 2 is provided with a sunken area 12 corresponding to the position of the avoidance space, and the sunken area 12 is used for placing children's feet, ensuring more In order to ensure the comfort when carrying children, if the bottom of the carrying area 11 is to be kept flat, the structure of the inner pocket 2 can be adjusted, for example, a whole pad (not shown in the figure) is added to facilitate the movement of young children.

As shown in FIGS. 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 , and the front diagonal brace 13 and the top of the rear diagonal strut 14 are hinged to the first pivot joint 17, one end of the front vertical brace 15 and the rear vertical brace 16 is hinged to the second pivot joint 18, and the other end of the front vertical brace 15 is hinged to the front diagonal brace The bottom of the rod 13 and the other end of the rear vertical support rod 16 are hinged to the bottom of the rear diagonal strut 14 . The rotary joint described in this embodiment has two parts that are rotatably connected to each other, and each part may be independent of the rod member or a part of the rod member, and is not limited to the form in the drawings.

In the unfolded state, the front vertical support rod 15 and the rear vertical support rod 16 are flat, forming a flat rectangular support frame with the horizontal support rod 32; in the folded state, the first rotating joint 17 and the second rotating joint 18 are adjacent to each other Specifically, the front vertical support rod 15 and the rear vertical support rod 16 rotate relative to each other and the second rotating joint 18 moves upward, pulling the front and rear diagonal struts to rotate around the first rotating joint 17 and move closer, and finally fold.

Please refer to FIGS. 9 to 14 again, in one embodiment, the front vertical support rod 15 and the rear vertical support rod 16 are coplanar, the front diagonal support rod 13 and the rear diagonal support rod 14 are coplanar, and the front vertical support rod 15 is located in the On the opposite inner side of the front diagonal strut 13, in the unfolded state, the four rods form a triangular frame, which improves the structural strength of the frame. In the horizontal viewing angle of the folded state, at least one vertical support rod overlaps with the corresponding diagonal strut, so that the front and rear diagonal struts can be further moved closer together, thereby reducing the folded volume. In a preferred embodiment, the bottom of the frame is provided with a front wheel 41 and a rear wheel 42 for the frame to move, and the front wheel 41 and the rear wheel 42 are laterally dislocated. All overlap, further reducing the volume of the folded frame.

Referring to FIGS. 2 to 9 , in one embodiment, the second rotating joint 18 is provided with a locking device for keeping the four-bar linkage in an unfolded state; and an unlocking device on the transverse connecting member 3 for releasing the lock. Wherein, the locking device includes a locking groove 181, a locking pin 182 and a first elastic member 183 in detail. The locking groove 181 is opened on one or both of the front vertical support rod 15 and the rear vertical support rod 16 to lock the The pin 182 is slidably installed on the other of the front vertical support rod 15 and the rear vertical support rod 16 . In this embodiment, the front and rear vertical support rods are provided with locking grooves 181 , which overlap each other in the unfolded state. The first elastic member 183 urges the locking pin 182 to extend into the locking groove 181 and has:

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

In the unlocked state, the locking pin 182 exits the locking groove 181, and the front and rear vertical support rods can rotate relative to each other.

The unlocking device includes an unlocking member 321, a second elastic member 322 and a pulling wire 323 in detail. The unlocking member 321 is mounted on the horizontal bracket 32, and the two ends of the pulling wire 323 are respectively connected to the unlocking member 321 and the locking pin 182, and have no extension. sex. The specific unlocking operation is as follows: sliding and moving the unlocking member 321, pulling the locking pin 182 through the pull wire 323 to exit the locking groove 181, and after the front and rear longitudinal towbars rotate relative to each other, the pressing on the unlocking member 321 is released, and the second elastic member 322 and the first elastic member 183 respectively drive the corresponding unlocking member 321 and the locking pin 182 to reset to complete the unlocking.

Referring to FIG. 15 , in one embodiment, the first rotating joint 17 is provided with an adapter seat 171 , and the adapter seat 171 is detachably plugged and fitted with an expansion device 5 , and the expansion device 5 can be a seat, a plate Or any accessory that can interact with children, such as a drawing board, or a retractable panel that covers the top of the cage for privacy or protection from rain and sun. The detachably connected expansion device of the trolley of the present application cooperates with the cage structure to realize the switching of various functions.

Please refer to FIG. 1 and FIG. 11 , in order to reduce the volume of the whole vehicle as much as possible, in one embodiment, the side guard 31 is a U-shaped skeleton formed by bending a pipe, or a U-shaped skeleton assembled with pipes. It is hinged on the side frame 1, and the closed end faces upwards for the inner pocket 2 to be hoisted and looped. In addition, the side guard 31 is located at the opposite inner side of the side frame 1 . In the folded state of the lateral viewing angle, the side guard 31 overlaps with the side frame 1 , reducing the volume of the folded frame.

Please refer to FIG. 1 , FIG. 9 and FIG. 10 again. In one embodiment, at least one side block 31 is provided with a storage basket 33 for loading articles. In a preferred embodiment, the storage basket 33 and the side block 31 are movably installed , which is beneficial to reduce the folded volume. The storage basket 33 includes a rigid support frame 331 hinged on the side block 31 in detail, and a deformable basket body 332 . Among them, the support frame 331 is located on the opposite inner side of the side stop 31. In the folded state of the lateral viewing angle, the two overlap each other, and the corresponding basket body 332 can be deformed and folded synchronously, so as to improve the carrying capacity of the article, while maintaining the folded shape. The volume of the vehicle remains unchanged.

Please refer to FIG. 1 , FIG. 9 and FIG. 10 again. In one embodiment, the first rotating joint 17 is arranged in the middle and the handle bar 6 is oscillatingly installed. In the folded state, each bar in the four-bar linkage mechanism And the handlebars 6 are gathered together, and the handlebar 6 can be folded synchronously through the linkage with one of the rods of the four-bar linkage mechanism, or can be folded independently. In the unfolded state, the handle bar 6 is inclined to the horizontal plane, which can effectively transmit the force to the bottom of the frame, so as to facilitate the control of the cart. In addition, there is only one connection between the handlebar and the side frame, which allows the height of the side frame to be lower than that of the traditional structure, and the frame is more compact and concise.

In one embodiment, the handle bar 6 is a straight bar in the lateral view, and the handle bar 6 forms an included angle α with the longitudinal direction of the frame, and the included angle α satisfies 45°<α<60°, which is convenient for moving , and inclined in the same direction as one of the diagonal struts, with a simple appearance. In a preferred embodiment, the handle bar 6 is collinear with a diagonal strut, which makes the appearance more concise, and can effectively transmit the force to the wheel, which is convenient for steering operation.

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. The upper handle bar 62 can be slidably embedded in the lower handle bar 61, or a sliding sleeve It is arranged on the outside of the lower handle bar 61, which is convenient for child escorts of different heights.

In the large-capacity trolley of the present application, the function of the seat for carrying children is transferred to the bottom of the frame, and side rails, side frames and cross braces are arranged to form a cage-shaped structure for carrying children or carrying children, effectively utilizing the longest length of the frame. distance, and improve the utilization rate in the height direction. Under the same frame, it has obtained a larger capacity and can carry at least two young children.

The technical features of the above embodiments can be combined arbitrarily. In order to simplify the description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, all It is considered to be the range described in this specification. When the technical features of different embodiments are embodied in the same drawing, it can be considered that the drawing also discloses the combination examples of the various embodiments involved.

The above examples only represent several embodiments of the present application, and the descriptions thereof are relatively specific and detailed, but should not be construed as a limitation on the scope of the patent application. It should be pointed out that for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application.

Claims (10)

1. The foldable trolley comprises a foldable trolley frame and wheels mounted at the bottom of the trolley frame, and is characterized in that the trolley frame is provided with opposite transverse and longitudinal directions, the trolley frame comprises two side frames which are arranged oppositely and a transverse connecting piece connected between the two side frames, the two side frames and the transverse connecting piece are integrally enclosed to form a cage-shaped structure with an open top, and a bearing area is arranged inside the cage-shaped structure;

the side frame adopts a foldable four-bar linkage mechanism, and in an unfolded state, four rod pieces are sequentially hinged, wherein two rod pieces are horizontally arranged and positioned at the bottom edge of the side frame, and the other two rod pieces extend upwards to intersect and are hinged with each other; under the folding state, all the rod pieces in the four-bar mechanism are gathered together.

2. A collapsible pushchair according to claim 1, wherein an open-topped inner pocket is provided within said cage structure for carrying a child or an item.

3. The foldable stroller of claim 2, wherein the lateral connecting member comprises side stops hinged to both longitudinal sides of the frame and a plurality of cross-support rods arranged at the bottom of the side frames, and the inner pocket is hung or sleeved on the side stops and is supported on the cross-support rods.

4. The foldable stroller of claim 2, wherein the bottom of the frame is an escape space at a longitudinally intermediate region, and the inner pocket is provided with a subsidence area corresponding to the position of the escape space.

5. The collapsible cart of claim 1, wherein said side frame includes a front diagonal brace, a rear diagonal brace, a front longitudinal brace, and a rear longitudinal brace, wherein tops of said front and rear diagonal braces are hinged to a first swivel joint, one ends of said front and rear longitudinal braces are hinged to a second swivel joint, another end of said front longitudinal brace is hinged to a bottom of said front diagonal brace, and another end of said rear longitudinal brace is hinged to a bottom of said rear diagonal brace;

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

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

6. A foldable trolley according to claim 5, characterized in that the first swivel joint is pivotally mounted with a handlebar stem, which can be extended or retracted.

7. A foldable trolley according to claim 5, wherein said front and rear longitudinal struts are coplanar, said front and rear diagonal struts are coplanar, said front longitudinal strut is on the opposite inner side of said front diagonal strut, and four members form a triangular frame.

8. A foldable trolley according to claim 5, characterized in that a locking device is provided at the second revolute joint to keep the four-bar linkage in the unfolded state; and an unlocking device for unlocking the lock is arranged on the transverse connecting piece.

9. The foldable stroller of claim 8, wherein said locking means comprises a locking slot provided in one of said front and rear longitudinal brackets, a locking pin slidably mounted on the other of said front and rear longitudinal brackets, and a first resilient member urging said locking pin into said locking slot.

10. A foldable trolley according to claim 9, wherein the unlocking means comprises an unlocking member slidably mounted on the transverse link, a second resilient member urging the unlocking member to return, and a pull wire secured at one end to the unlocking member and at the other end to the locking pin for urging the locking pin to slide with the unlocking member out of the locking slot.

Images