CN222728021U

CN222728021U - A flat folding cart

Info

Publication number: CN222728021U
Application number: CN202421652158.2U
Authority: CN
Inventors: 郑雪峰
Original assignee: Hangzhou Zhengchuang Industrial Design Co ltd
Current assignee: Hangzhou Zhengchuang Industrial Design Co ltd
Priority date: 2024-07-12
Filing date: 2024-07-12
Publication date: 2025-04-08
Anticipated expiration: 2034-07-12

Abstract

The utility model relates to the technical field of carts, and specifically to a flat-folding cart, comprising two vertical frames arranged opposite to each other and two side frames arranged opposite to each other, the two vertical frames and the two side frames together form a frame, and a bottom frame is provided at the bottom of the frame; the side frames include two folding frames, and the folding frames include connecting rods, struts and pull rods; one end of the connecting rod is hinged to the vertical frame and forms a first hinge point; the connecting rod is provided with a sliding member that can slide along the length direction of the connecting rod, and a positioning member that limits the maximum downward sliding position of the sliding member; one end of the strut is hinged to the sliding sleeve, and the other end is hinged to the vertical frame to form a second hinge point; one end of the pull rod is hinged to the sliding sleeve, and the other end is hinged to the bottom frame; in the same side frame, the ends of the two connecting rods away from the vertical frame are hinged; in this scheme, the height of the cart in the folded state will not increase compared with the height in the unfolded state, which is conducive to packaging or storing the folded cart.

Description

Flat-folding trolley

Technical Field

The utility model relates to the technical field of carts, in particular to a flat-folding cart.

Background

Carts, also known as carts or hand trucks, are mainly used for short distance transport of objects, which have a wide range of applications in everyday life.

In order to facilitate storage or packaging of the cart, some carts in the related art are designed to be foldable, such as flat-folded carts, and for the cart frame which is formed by a folding mechanism with multiple connecting rods, when the cart frame needs to be folded, the cart frame can be folded in a flat manner along the length direction so as to realize folding, and related art refers to patent documents such as CN207481955U, CN 115107841A.

For the existing flat folding cart, although flat folding can be realized, the flat folding cart still has defects in practical application, for example, the height of the flat folding cart in a folded state is increased compared with that in an unfolded state, so that the folded cart is higher, and is not beneficial to storage or packaging. Thus, there is a need for improvement.

Disclosure of utility model

In order to solve at least one technical problem mentioned in the background art, an object of the present utility model is to provide a flat folding cart.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

The flat folding trolley comprises two vertical frames and two side frames, wherein the vertical frames are oppositely arranged along the two edges, the two vertical frames and the two side frames are encircled to form a frame body, an underframe capable of being folded upwards is arranged at the bottom of the frame body, rollers are arranged at the bottom of the vertical frames, the side frames comprise two folding frames, each folding frame comprises a connecting rod, a supporting rod and a pull rod, one end of each connecting rod is hinged with the corresponding vertical frame to form a first hinge point, a sliding piece capable of sliding along the length direction of each connecting rod and a positioning piece for limiting the maximum sliding position of the corresponding sliding piece are arranged on each connecting rod, one end of each supporting rod is hinged with a sliding sleeve, the other end of each supporting rod is hinged to the corresponding vertical frame to form a second hinge point, the first hinge point is located below the second hinge point, one end of each pull rod is hinged with the corresponding sliding sleeve, the other end of each pull rod is hinged with the corresponding underframe, and one ends of the two connecting rods, which are far away from the corresponding vertical frames, are hinged.

As an alternative embodiment of the utility model, the hinge point of the slider and the stay and the hinge point of the slider and the stay coincide.

As an alternative embodiment of the present utility model, the sliding member includes a sliding sleeve that slides through the connecting rod, and/or the positioning member includes a positioning sleeve that fixedly extends through the connecting rod, and when the sliding sleeve slides down the connecting rod to a positioning sleeve position, the positioning sleeve abuts against the sliding sleeve to limit the sliding sleeve from sliding further.

As an alternative embodiment of the utility model, the underframe comprises two underframes, one ends of the two underframes are hinged, and the other ends of the two underframes are respectively hinged on the two uprights.

As an alternative embodiment of the utility model, the chassis is horizontally deployed at the bottom of the frame when the carriage is slid to the maximum slide-down position.

As an alternative embodiment of the present utility model, one of the two uprights constitutes a front upright and the other constitutes a rear upright, and the front upright and/or the rear upright are/is of inverted U-shaped structure.

As an alternative embodiment of the present utility model, the flat folding cart further includes a pull rod assembly that can be extended and contracted along its length direction.

As an alternative implementation mode of the utility model, two rollers are arranged at the bottom of each stand, the rollers on the two stands are arranged in a staggered way, and the flat folding cart is in a folded state, wherein the two rollers at the bottom of one stand can be accommodated between the two rollers at the bottom of the other stand.

Compared with the prior art, the scheme has the advantages that:

Firstly, the structure of side bearer in this scheme for the shallow can flat folding, and the shallow is in flat folding back moreover, and its height is than the shallow can not be increased by the height of the shallow under the expansion state, thereby is favorable to packing or accomodating the shallow after folding.

Secondly, in the unfolding state of the trolley, the supporting rod, the connecting rod and the vertical frame can be encircled to form a triangular supporting structure, and meanwhile, the connecting rod, the underframe and the pulling rod are also converged to form the triangular supporting structure; in addition, the two connecting rods and the underframe are surrounded to form an A-shaped supporting structure, so that stability of the cart in an unfolding state is guaranteed.

Finally, in this scheme, the setting of slider and setting element for the shallow is after expanding, under the effect of shallow bearing and dead weight, and the slider has along the trend of connecting rod gliding and then contradict on the setting element, makes the slider by the location need not to continue the gliding, thereby restriction sliding sleeve gliding degree of freedom downwards realizes the auto-lock function, makes the shallow can keep expanding the state.

Drawings

FIG. 1 is a schematic view of the structure of the present utility model in an unfolded state;

FIG. 2 is a front view of the present utility model in an expanded state;

FIG. 3 is a schematic view of the present utility model in a folded configuration;

FIG. 4 is a front view of the present utility model in a folded state;

Fig. 5 is a schematic view of the structure of the present utility model in a folded state.

Detailed Description

The technical solutions of the embodiments of the present utility model will be explained and illustrated below with reference to the drawings of the embodiments of the present utility model, but the following embodiments are only preferred embodiments of the present utility model, and not all embodiments. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making creative efforts fall within the protection scope of the present utility model.

In the following description, directional or positional relationships such as the terms "inner", "outer", "upper", "lower", "left", "right", etc., are presented for convenience in describing the embodiments and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model.

Referring to fig. 1-5, the present embodiment provides a flat-folding cart, which includes two upright frames 100 and two side frames 200 disposed opposite to each other, and the two upright frames 100 and the two side frames 200 are surrounded to form a frame body.

Specifically, as shown in fig. 1, in the unfolded state, the two uprights 100 are disposed opposite to each other along the length direction of the cart, and the two side frames 200 are disposed opposite to each other along the width direction of the cart, so that the two uprights 100 and the two side frames 200 surround to form an approximately rectangular frame body. The bottom of the frame body is provided with a bottom frame 300 which can be turned upwards and folded.

At this time, one of the two uprights 100 forms a front upright of the cart (as shown in part a of fig. 1), the other forms a rear upright of the cart (as shown in part b of fig. 1), and the two side frames 200 form side walls of both sides of the cart, respectively. It will be appreciated that in actual use, the cart further comprises a cart bag (not shown) sleeved on the frame, and the cart bag is used as a carrier for accommodating articles.

In this embodiment, the two uprights 100 are of inverted U-shaped structures, and two rollers 10 are disposed at the bottom of each upright 100, so that the cart can be pushed or pulled for transportation.

In this embodiment, the two side frames 200 have substantially the same structure, so in this embodiment, one of the side frames 200 is taken as an example for specific description below:

Referring to fig. 2, the side frame 200 includes two folding frames 20, the two folding frames 20 are sequentially connected along the length direction of the cart, and two ends of the side frame 200 are respectively hinged to the two uprights 100.

The two folding frames 20 are substantially identical in structure, and one of them will be described in detail as follows:

As shown in fig. 2, the folding frame 20 includes a connecting rod 21, a supporting rod 22 and a pulling rod 23, one end of the connecting rod 21 is hinged with the stand 100 and forms a first hinge point J1, and the connecting rod 21 and the stand 100 can relatively rotate based on the first hinge point J1, where the first hinge point J1 is located at the bottom of the stand 100.

The connecting rod 21 is provided with a sliding part capable of sliding along the length direction of the connecting rod 21 and a positioning part for limiting the maximum sliding position of the sliding part.

The maximum slide-down position is understood to mean that the slide member can slide along the length direction of the link 21, that is, slide down, that is, slide along the link 21 in the direction near the first hinge point J1, and vice versa, that is, slide up, so that the maximum slide-down position is understood to mean that the slide member can slide down to the maximum position, and when the slide member slides to this position, the slide member cannot continue to slide down under the restriction of the positioning member, and the cart is in the fully unfolded state as shown in fig. 1.

One end of the supporting rod 22 is hinged with the sliding part, the other end of the supporting rod 22 is hinged on the vertical frame 100 to form a second hinge point J2, the supporting rod 22 and the vertical frame 100 can relatively rotate based on the second hinge point J2, and the first hinge point J1 is located below the second hinge point J2.

One end of the pull rod 23 is hinged with the sliding part, the other end of the pull rod is hinged with the underframe 300 to form a fourth hinge point J4, and the pull rod 23 and the underframe 300 can relatively rotate based on the fourth hinge point J4.

It is preferred that the hinge points of the slider and the stay 22 and the hinge point of the slider and the stay 23 coincide, which is denoted as a third hinge point J3, such that both the stay 23 and the stay 22 can be rotated with respect to the slider based on the third hinge point J3.

The aforementioned hinge point coincidence is understood to mean that the relative rotation axes of the slider and the stay 22 coincide with the rotation axes of the slider and the pull rod 23, for example, the stay 22 and the pull rod 23 are rotatably connected to the slider by the same rivet.

Of course, in other alternative embodiments, the hinge point of the sliding element and the supporting rod 22 and the hinge point of the sliding element and the pulling rod 23 may not coincide, for example, the two hinge points may be staggered up and down, or one may be in the center, one may be on the upper side or the lower side, etc.

In the same side frame 200, the two links 21 are hinged at the end remote from the upright frame 100.

Through the above arrangement, as shown in fig. 3, when the chassis 300 is turned upwards to fold, the chassis 300 pulls the pull rod 23 to move upwards, the pull rod 23 pushes the sliding members to slide upwards along the connecting rod 21, and then drives the supporting rod 22 and the connecting rod 21 to turn towards the position close to the vertical frame 100 until the two sliding members on the two connecting rods 21 are in contact with each other, at this time, the sliding members interfere with each other to stop sliding, and at this time, folding of the cart is realized, as shown in fig. 4, the two vertical frames 100 are in approximately parallel states in the folded state of the cart.

The side frame 200 structure is adopted to realize the flat folding of the cart, and has the advantages that after the flat folding of the cart, the height of the cart is not increased compared with the height of the cart in the unfolded state, in other words, the height of the cart can be regarded as the height of the stand 100 in the unfolded state, and the height of the cart cannot exceed the height of the stand 100 in the folded state, so that the height of the cart is not increased, and the height of the cart is still the height of the stand 100, thereby being beneficial to packaging or containing the folded cart.

Further, as shown in fig. 1 and 2, in the fully unfolded state of the stroller, the stay 22, the link 21 and the stand 100 meet to form a triangular support structure, and the triangular support structure has a first hinge point J1, a second hinge point J2 and a third hinge point J3 as vertexes of a triangle.

Meanwhile, the connecting rod 21, the underframe 300 and the pull rod 23 also meet to form a triangular supporting structure, and the triangular supporting structure takes the first hinge point J1, the third hinge point J3 and the fourth hinge point J4 as vertexes of a triangle.

In addition, the two links 21 and the chassis 300 enclose an a-type support structure.

Based on triangle-shaped bearing structure and A type bearing structure makes the shallow comparatively stable under the expansion state.

Finally, the sliding part and the positioning part are arranged, so that after the trolley is unfolded, under the action of the load bearing and/or dead weight of the trolley, the sliding part has a trend of sliding downwards along the connecting rod 21 and then is abutted against the positioning part, so that the sliding part is positioned without continuing to slide downwards, the degree of freedom of sliding downwards of the sliding sleeve 24 is limited, the self-locking function is realized, and the trolley can be kept in an unfolded state.

In this embodiment, the sliding member includes a sliding sleeve 24 slidably sleeved on the connecting rod 21, and the sliding sleeve 24 can slide along the length direction of the connecting rod 21.

The positioning member comprises a positioning sleeve 25 fixedly sleeved on the connecting rod 21, wherein the positioning sleeve 25 can be fixed with the connecting rod 21 by adopting rivet fixing, screw fixing or welding and the like.

The position of the positioning sleeve 25 on the connecting rod 21 determines the maximum sliding position of the sliding sleeve 24, when the sliding sleeve 24 slides down along the connecting rod 21 to the position of the positioning sleeve 25, as shown in fig. 2, the positioning sleeve 25 abuts against the sliding sleeve 24 to limit the sliding sleeve 24 to slide down, and the cart is in a fully-unfolded state, in which the underframe 300 is preferably unfolded substantially horizontally at the bottom of the frame body.

In this embodiment, as shown in fig. 1, the underframe 300 is configured such that the underframe 300 includes two underframes 30, the two underframes 30 are sequentially connected along the length direction of the cart, specifically, one ends of the two underframes 30 are hinged, and the other ends of the two underframes 30 are respectively hinged on the two uprights 100. The two tie rods 23 in the same side frame 200 are respectively hinged with the two bottom frames 30.

In addition, in order to facilitate pushing/pulling of the cart, as shown in fig. 1, the flat folding cart further includes a pull rod assembly 400 that can be extended and contracted along its length direction, and the lower end of the pull rod assembly 400 may be hinged or fixed to the bottom of the front vertical frame. There are many applications for such a telescopic drawbar assembly 400 in existing folding carts and will not be described in detail herein.

In this embodiment, two rollers 10 are disposed at the bottom of each stand 100, the rollers 10 on the two stands 100 are staggered, for example, as shown in fig. 1, the distance between the two rollers 10 of the front stand b is smaller than the distance between the two rollers 10 of the rear stand a, and on the projection of the cart in the length direction, the two rollers 10 of the front stand a are located between the two rollers 10 of the rear stand b, so that in the folded state of the flat folding cart, the two rollers 10 at the bottom of one stand 100 can be partially accommodated between the two rollers 10 at the bottom of the other stand 100, i.e. a portion of the two rollers 10 of the front stand a are accommodated between the two rollers 10 of the rear stand b, thereby being beneficial for reducing the thickness of the cart in the folded state.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. The flat folding trolley comprises two vertical frames and two side frames, wherein the vertical frames and the side frames are oppositely arranged, the two vertical frames and the two side frames are encircled to form a frame body, an underframe capable of being folded upwards is arranged at the bottom of the frame body, rollers are arranged at the bottom of the vertical frames, the flat folding trolley is characterized in that the side frames comprise two folding frames, each folding frame comprises a connecting rod, a supporting rod and a pull rod, one end of each connecting rod is hinged with the corresponding vertical frame and forms a first hinge point, a sliding part capable of sliding along the length direction of each connecting rod and a positioning part for limiting the maximum sliding position of the corresponding sliding part are arranged on each connecting rod, one end of each supporting rod is hinged with the corresponding sliding sleeve, the other end of each supporting rod is hinged with the corresponding vertical frame to form a second hinge point, one end of each pull rod is hinged with the corresponding sliding sleeve, the other end of each supporting rod is hinged with the underframe, and one ends of the two connecting rods, which are far away from the corresponding vertical frames, are hinged with each other.

2. The flat-fold cart of claim 1, wherein the hinge point of the slider and the brace and the hinge point of the slider and the brace coincide.

3. A flat-fold cart according to claim 1, wherein the slide comprises a sleeve slidably mounted over the link and/or the positioning member comprises a sleeve fixedly mounted over the link, the sleeve being arranged to abut the sleeve to limit further sliding of the sleeve as the sleeve slides down the link to the sleeve position.

4. The flat folding cart of claim 1, wherein the chassis comprises two bottom frames, one ends of the two bottom frames are hinged, and the other ends of the two bottom frames are respectively hinged on the two vertical frames.

5. The flat fold cart of claim 1, wherein the chassis is horizontally deployed at the bottom of the frame when the carriage is slid to the maximum slide down position.

6. A flat folding cart according to claim 1, wherein one of the two uprights constitutes a front upright and the other constitutes a rear upright, the front and/or rear uprights being of inverted U-shaped configuration.

7. The flat-fold cart of claim 1, further comprising a pull rod assembly that is retractable along its length.

8. The flat-folding cart according to claim 1, wherein two rollers are arranged at the bottom of each stand, the rollers on the two stands are arranged in a staggered manner, and in a folded state, the two rollers at the bottom of one stand can be accommodated between the two rollers at the bottom of the other stand.