CN220076460U

CN220076460U - Portable folding handcart

Info

Publication number: CN220076460U
Application number: CN202320888797.8U
Authority: CN
Inventors: 张发辉
Original assignee: Zhongshan Tongxin Daily Products Co ltd
Current assignee: Zhongshan Tongxin Daily Products Co ltd
Priority date: 2023-04-19
Filing date: 2023-04-19
Publication date: 2023-11-24
Anticipated expiration: 2033-04-19

Abstract

The utility model discloses a portable folding handcart, which comprises a rear wheel frame, a front wheel frame, a seat frame and a handle, wherein the front wheel frame, the seat frame and the handle are connected with the rear wheel frame, the rear wheel frame is provided with a connecting part, the front wheel frame is provided with a first connecting head, the handle is provided with a second connecting head, a connecting rod mechanism is arranged in the connecting part, the first connecting head, the second connecting head and the seat frame are connected with each other through the connecting rod mechanism, and when the folding handcart is folded, the seat frame and the front wheel frame can be folded together only by rotating the handle in the direction of the rear wheel frame, the operation process is simple and convenient, the design of the connecting rod mechanism is centralized, and the folding structure is simplified structurally; after folding, the handcart is folded in the front-back direction, and the rear wheel, the front wheel and the handle are used for keeping a standing posture, so that the handcart is convenient to move and saves space.

Description

Portable folding handcart

Technical Field

The utility model relates to the technical field of trolleys, in particular to a portable folding trolley.

Background

The trolley is generally applied to traveling, shopping, children bearing and the like, and is structurally provided with four wheels, a hand push handle, a seat or a storage rack, so that the trolley on the market is designed to be foldable in order to meet the requirements of storage and transportation, but on one hand, in order to realize the folding function, a plurality of folding mechanisms are designed on a vehicle body, and folding operations such as shrinkage, sliding, rotation and the like in the aspects of wheels, handles, frames and the like on the vehicle body are required to be dispersed, so that the friction force is large, the structure is unstable, and the labor and the complexity are high in the folding process after long-time use; on the other hand, the folding trolley on the market mainly has a compression space, so that in order to achieve the maximum folding effect, most existing folding trolleys cannot be balanced after folding and can only lie flat, if the folding trolleys are balanced after folding, four wheels cannot be folded, as in the product disclosed in patent No. CN104002851B, and the effect of folding the compression space is general.

Disclosure of Invention

In view of the above, the present utility model aims to provide a portable folding cart with a simple folding mechanism and a convenient folding process.

The utility model adopts the technical proposal for solving the technical problems that:

the utility model provides a portable folding handcart, includes back wheel carrier and front wheel carrier, seat frame and the handle of being connected with back wheel carrier, be provided with connecting portion on the back wheel carrier, be provided with first connector on the front wheel carrier, be provided with the second connector on the handle, be provided with link mechanism in the connecting portion, first connector, second connector, seat frame pass through link mechanism interconnect in connecting portion, when the handle is received to back wheel carrier direction, front wheel carrier and seat frame also can receive to back wheel carrier direction through link mechanism.

The link mechanism comprises a first link rod arranged below the seat frame, a second link rod connected with the first link rod and the first connector, and a third link rod connected with the first connector and the second connector, wherein the first link rod is connected with the second link rod and the second connector.

A first revolute pair is formed at the joint of one end of the first connecting rod and one end of the second connecting rod, a second revolute pair is formed at the joint of the other end of the first connecting rod and the second connecting head,

a third revolute pair is formed at the joint of the other end of the second connecting rod and the first connecting head,

and a fourth revolute pair is formed at the joint of one end of the third connecting rod and the second connector, and a fifth revolute pair is formed at the joint of the other end of the third connecting rod and the first connector.

The first connector is provided with a convex edge part, and the second connector is provided with a concave edge part which can be clamped with the convex edge part when the handle and the front wheel frame are folded in the rear wheel frame direction.

The handle comprises a hollow rod connected with the first connecting head, a telescopic rod capable of moving in the hollow rod, and a holding part arranged at one end of the telescopic rod, wherein a switch capable of controlling the telescopic rod to move or be fixed in the hollow rod is arranged on the holding part.

The second revolute pair is internally provided with a rotating pin, the first connector is internally provided with a rotation limiting piece and a spring, the rotation limiting piece comprises a tail part and a limiting part, and the spring acts on the tail part and enables the limiting part to be abutted on the rotating pin so as to limit the second revolute pair to rotate.

The end of the other end of the telescopic rod is provided with a jacking block, and when the telescopic rod moves to a position close to the second connector in the hollow rod and is fixed, the jacking block can be abutted to the tail part and compress the spring so that the limiting part is separated from the rotating pin to enable the second revolute pair to rotate.

The beneficial effects of the utility model are as follows:

the front wheel frame, the rear wheel frame, the seat frame and the handle of the portable folding handcart are movably connected mainly through a connecting rod mechanism. When the folding and folding are carried out, under the unlocking of a switch on the holding part, the top block at the end part of the telescopic rod moves to the second connector along with the telescopic rod in the hollow rod and pushes the rotation limiting piece, so that the second revolute pair can rotate, the handle starts to rotate in the rear wheel frame direction by taking the fourth revolute pair as a rotation point, and under the action of the first connecting rod, the seat frame starts to rotate in the front wheel frame direction; under the effect of the first revolute pair, the second connecting rod is pressed and is arranged on the first connector through the third revolute pair, when the handle rotates to a certain position, the third connecting rod is pulled under the effect of the fourth revolute pair and the fifth revolute pair, the front wheel frame rotates and is folded in the backward wheel frame direction through the third revolute pair and the fifth revolute pair, and finally the convex edge part at the first connector and the concave edge part at the second connector are mutually clamped under slight elastic deformation, so that the stability of a folding state is ensured.

By utilizing the movement characteristic of the link mechanism, the seat frame and the front wheel frame can be folded together only by rotating the handle to fold in the direction of the rear wheel frame during folding, the operation process is simple and convenient, the design of the link mechanism is centralized, and the folding structure is simplified structurally; after folding, the handcart is folded in the front-back direction, and the rear wheel, the front wheel and the handle are used for keeping a standing posture, so that the handcart is convenient to move and saves space.

Drawings

FIG. 1 is a schematic view of the unfolded external structure of a portable folding cart;

FIG. 2 is a schematic view of the external appearance of a folding portable folding cart;

FIG. 3 is a schematic view of a portion of an exploded view of a folding cart;

FIG. 4 is a schematic view of the linkage mechanism in the unfolded condition of the cart;

FIG. 5 is an exploded view of the linkage position in the deployed condition of the cart;

FIG. 6 is a schematic view of the linkage mechanism in a collapsed condition of the cart;

FIG. 7 is an exploded view of the linkage mechanism in position in the collapsed condition of the cart;

FIG. 8 is a cross-sectional view of the first connector in the unfolded condition of the cart;

FIG. 9 is a cross-sectional view of the first connector in the collapsed condition of the cart;

FIG. 10 is a schematic view of the first connector in the unfolded condition of the cart;

FIG. 11 is a schematic view of the first connector in a collapsed condition of the cart;

fig. 12 is a schematic view of the structure of the handle in the folded state of the cart.

Detailed Description

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the utility model more clear, the technical scheme of the utility model is further described below by a specific embodiment in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present utility model are shown.

Referring to fig. 1, 2 and 3, the utility model provides a portable folding handcart, which comprises a rear wheel frame 1, a front wheel frame 2, a seat frame 4 and a handle 3, wherein the front wheel frame 2, the seat frame 4 and the handle 3 are connected with the rear wheel frame 1, a connecting part 10 is arranged on the rear wheel frame 1, a first connecting head 20 is arranged on the front wheel frame 2, a second connecting head 30 is arranged on the handle 3, a connecting rod mechanism 5 is arranged in the connecting part, the first connecting head 20, the second connecting head 30 and the seat frame 4 are mutually connected in the connecting part 10 through the connecting rod mechanism 5, and when the handle 3 is folded towards the rear wheel frame 1, the front wheel frame 2 and the seat frame 4 can be folded towards the rear wheel frame 1 through the connecting rod mechanism 5.

Referring to fig. 4 and 5, the link mechanism 5 includes a first link 51 provided below the seat frame 4, a second link 52 connected to the first link 51 and the first connector 20, and a third link 53 connected to the first connector 20 and the second connector 30, and the first link 51 is connected to the second link 52 and the second connector 30.

A first revolute pair 61 is formed at the connection position between one end of the first connecting rod 51 and one end of the second connecting rod 52, a second revolute pair 62 is formed at the connection position between the other end of the first connecting rod 51 and the second connecting head 30,

a third revolute pair 63 is formed at the connection position between the other end of the second connecting rod 52 and the first connecting head 20,

the connection between one end of the third connecting rod 53 and the second connector 30 forms a fourth revolute pair 64, and the connection between the other end of the third connecting rod 53 and the first connector 20 forms a fifth revolute pair 65.

Further, the front wheel frame 2, the rear wheel frame 1, the seat frame 4 and the handle 3 of the portable folding handcart are movably connected mainly through a link mechanism 5. When folding and folding are carried out, under the unlocking of the switch 330 on the holding part 33, the top block 320 at the end part of the telescopic rod 32 moves to the second connector 30 along with the telescopic rod 32 in the hollow rod 31 and pushes the rotation limiting piece 301, so that the second revolute pair 62 can rotate, the handle 3 starts to rotate towards the rear wheel frame 1 by taking the fourth revolute pair 64 as a rotation point, and under the action of the first connecting rod 51, the seat frame 4 starts to rotate towards the front wheel frame 2; under the action of the first revolute pair 61, the second connecting rod 52 is pressed, the third revolute pair 63 acts on the first connecting head 20, when the handle 3 rotates to a certain position, the third connecting rod 53 is pulled under the action of the fourth revolute pair 64 and the fifth revolute pair 65, and the front wheel frame 2 rotates and closes in the direction of the rear wheel frame 1 through the third revolute pair 63 and the fifth revolute pair 65, so that the switching from the unfolded state to the folded state is completed.

Referring to fig. 7, the first connector 20 is provided with a protruding edge portion 200, and the second connector 30 is provided with a recessed edge portion 303 that can engage with the protruding edge portion 200 when the handle 3 and the front wheel frame 2 are retracted in the rear wheel frame 1 direction. When the connector is folded, the convex edge part 200 at the first connector 20 and the concave edge part 303 at the second connector 30 are mutually clamped under slight elastic deformation, so that the stability of the folded state is ensured.

Referring to fig. 12, the handle 3 includes a hollow rod 31 connected to the second connector 30, a telescopic rod 32 movable within the hollow rod 31, and a grip 33 provided at one end of the telescopic rod 32, and a switch 330 for controlling the telescopic rod 32 to move or fix within the hollow rod 31 is provided on the grip 33. Further, the telescopic rod 32 is provided with a fixing pin, and the switch 330 can control the telescopic action of the fixing pin. Holes for fixing the fixing pins are formed in positions near two ends of the hollow rod 31, when the telescopic rod 31 needs to move, the switch 330 controls the fixing pins to retract, and when the telescopic rod 32 is fixed in an unfolding state or a folding state, the fixing pins keep a state of extending out of the holes on the wall of the hollow rod 31, so that the fixing is completed.

Referring to fig. 8 and 9, the second revolute pair 62 has a rotation pin 620, the second connector 30 has a rotation limiter 301 and a spring 302, the rotation limiter 301 includes a tail 3011 and a limiter 3010, and the spring 302 acts on the tail 3011 and makes the limiter 3010 abut against the rotation pin 620 to limit rotation of the second revolute pair 62. Further, the limiting portion 3010 is in a curved hook shape, and abuts against the outer wall of the cylinder of the rotation pin 620 through the hook, so that the rotation of the second revolute pair 62 can be limited due to the limited movable space of the rotation limiting member 301 in the second connector 30, and the pressure of the hook to the rotation pin 620 is further increased through the tail portion 3011 under the action of the spring 302 to increase friction.

Referring to fig. 10, 11 and 12, the end of the other end of the telescopic rod 32 is provided with a top block 320, and when the telescopic rod 32 moves in the hollow rod 31 to a position close to the second joint 30 and is fixed, the top block 320 can abut against the tail 3011 and compress the spring 302 to disengage the restricting portion 3010 from the rotation pin 620, and at this time, the hook abutting against the rotation pin 620 is disengaged, so that the second revolute pair 62 can rotate, the handle 3 can rotate in the direction of the rear wheel frame 1, and at this time, the switching from the unfolded state to the folded state can be performed.

The portable folding handcart utilizes the motion characteristic of the link mechanism 5, when the folding handcart is folded, the seat frame 4 and the front wheel frame 2 can be folded together only by folding the rear wheel frame 1 by rotating the handle 3, the operation process is simple and convenient, the design of the link mechanism 5 is centralized, and the folding structure is simplified structurally; after folding, the handcart is folded in the front-back direction, and the rear wheel, the front wheel and the handle are used for keeping a standing posture, so that the handcart is convenient to move and saves space.

Claims

1. The utility model provides a portable folding handcart, includes back wheel carrier (1), and preceding wheel carrier (2), seat frame (4) and handle (3) of being connected with back wheel carrier (1), a serial communication port, be provided with connecting portion (10) on back wheel carrier (1), be provided with first connector (20) on preceding wheel carrier (2), be provided with second connector (30) on handle (3), be provided with link mechanism (5) in connecting portion (10), first connector (20), second connector (30), seat frame (4) are through link mechanism (5) interconnect in connecting portion (10), when handle (3) are to back wheel carrier (1) direction receipts, preceding wheel carrier (2) and seat frame (4) also can be to back wheel carrier (1) direction receipts through link mechanism (5).

2. A portable folding cart according to claim 1, characterized in that the linkage (5) comprises a first link (51) arranged below the seat frame (4), a second link (52) connected to the first link (51) and the first connector (20), a third link (53) connected to the first connector (20) and the second connector (30), the first link (51) being connected to the second link (52) and the second connector (30).

3. A portable folding cart according to claim 2, wherein a first revolute pair (61) is formed at the junction of one end of the first link (51) and one end of the second link (52), a second revolute pair (62) is formed at the junction of the other end of the first link (51) and the second connector (30),

a third revolute pair (63) is formed at the joint of the other end of the second connecting rod (52) and the first connecting head (20),

a fourth revolute pair (64) is formed at the joint of one end of the third connecting rod (53) and the second connector (30), and a fifth revolute pair (65) is formed at the joint of the other end of the third connecting rod (53) and the first connector (20).

4. Portable folding trolley according to claim 1, characterized in that the first connector (20) is provided with a protruding edge portion (200), and the second connector (30) is provided with a recessed edge portion (303) which can be engaged with the protruding edge portion (200) when the handle (3) and the front wheel frame (2) are folded in the direction of the rear wheel frame (1).

5. A portable folding cart according to claim 3, characterized in that the handle (3) comprises a hollow bar (31) connected to the second connector (30), a telescopic bar (32) movable in the hollow bar (31), a holding part (33) arranged at one end of the telescopic bar (32), and a switch (330) arranged on the holding part (33) for controlling the telescopic bar (32) to move or fix in the hollow bar (31).

6. The portable folding cart according to claim 5, wherein the second revolute pair (62) has a rotation pin (620) therein, the second connector (30) has a rotation limiter (301) and a spring (302) disposed therein, the rotation limiter (301) includes a tail portion (3011) and a limiter (3010), and the spring (302) acts on the tail portion (3011) and causes the limiter (3010) to abut against the rotation pin (620) to limit rotation of the second revolute pair (62).

7. A portable folding cart according to claim 6, characterized in that the end of the other end of the telescopic rod (32) is provided with a top block (320), and when the telescopic rod (32) moves in the hollow rod (31) to a position close to the second connector (30) and is fixed, the top block (320) can abut against the tail part (3011) and compress the spring (302) to disengage the limiting part (3010) from the rotating pin (620) to enable the second rotating pair (62) to rotate.