WO2020034915A1

WO2020034915A1 - Trolley

Info

Publication number: WO2020034915A1
Application number: PCT/CN2019/100167
Authority: WO
Inventors: 朱华斌; 吴凡祥
Original assignee: 东莞金旺儿童用品有限公司
Priority date: 2018-08-14
Filing date: 2019-08-12
Publication date: 2020-02-20
Also published as: CN110271594A; CN110271594B

Abstract

A trolley (100), comprising a trolley frame, a front wheel assembly (9), and a rear wheel assembly (10). The trolley frame comprises: a frame front rod (1); a frame rear rod (2); a push rod (3); a first extension rod (4); a support rod (5), wherein the front end of the support rod (5) is rotatably connected to an upper rear rod (21), and the rear end is rotatably connected to an upper push rod (31); a first linkage mechanism (7) provided between the front end of the support rod (5) and a lower rear rod (22); a transmission rod (6), wherein one end of the transmission rod (6) is rotatably connected to a lower push rod (32); and a second linkage mechanism (8), wherein the front end of the second linkage mechanism (8) is rotatably connected to the frame front rod (1), and the rear end is rotatably connected to the other end of the transmission rod (6) and the upper rear rod (21), respectively.

Description

trolley

Technical field

The invention relates to the technical field of hand trucks, in particular to a hand truck.

Background technique

In the prior art, the handcart has a large size and a high height after being folded, and is not convenient to store and carry after being folded. It does not have portability and cannot take into account the folding driving force and the folding height.

Summary of the Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, an object of the present invention is to provide a trolley, which has sufficient driving force and has a low overall height after being folded.

A cart according to an embodiment of the present invention includes a cart frame having an unfolded state and a folded state, a front wheel assembly, and a rear wheel assembly. The cart frame includes: a frame front rod, the frame front rod extending from front to The rear rod extends obliquely upward; the rear rod of the frame extends obliquely downwards from front to back, and the rear rod of the frame includes a lower rear rod and an upper rear rod that can slide and retract relatively; Can be switched between extended and shortened states; putter, the putter includes a lower putter and an upper putter, both the upper putter and the lower putter are inclined to extend upward from front to back, and the lower The front end of the push rod is rotatably connected to the front end of the upper rear rod, and the rear end of the lower push rod is rotatably connected to the front end of the upper push rod; a first extension rod, the first extension rod is inclined upward from front to back Extended, the front end of the first extension rod is rotatably connected to the rear end of the front rod of the frame, the rear end of the first extension rod is fixedly connected to the front end of the upper rear rod, and in the expanded state, the first extension The rod is substantially in a straight line with the front rod of the frame; The end is rotatably connected to the upper rear rod, and the rear end of the stay is rotationally connected to the upper push rod; a first linkage mechanism is provided between the front end of the stay and the lower rear rod. Drive the first linkage mechanism to rotate to drive the relative sliding expansion between the upper rear rod and the lower rear rod; a transmission rod, one end of the transmission rod is rotationally connected to the lower push rod; a second linkage mechanism A front end of the second linkage mechanism is rotatably connected with the front rod of the frame, a rear end of the second linkage mechanism is rotatably connected with the other end of the transmission rod and the upper rear rod, and the cart When the frame is folded, the transmission rod rotates to drive the second linkage mechanism to rotate to drive the front rod of the frame toward the rear rod of the frame.

According to the cart of the embodiment of the present invention, not only the folding and unfolding operation of the cart is convenient and simple, but also it is connected to the upper and rear rods through the rotation of the strut. The connection position is relatively high. When folded, the driving force is sufficient and the length of the strut is moderate. , There will not be the problem of the length of the post after folding is too long, and the length of the lower rear rod does not need to be very long, so that the length of the upper rear rod can be contracted is longer, in addition, by setting the first extension rod, it can be reduced The length of the front rod of the frame can be significantly reduced after the trolley is folded, and the overall structure of the trolley is more compact, which is convenient to carry and store.

In addition, when the relative telescopic distance of the upper and lower rear rods needs to be different, only the length of the lower rear rod can be adjusted to obtain the contraction distance of different lengths, while the adjustment of the length of the lower rear rod does not achieve the entire structural function of the hand cart. Other effects.

In addition, the trolley according to the embodiment of the present invention may also have the following additional technical features:

According to an embodiment of the present invention, the first linkage mechanism includes: a connecting rod whose lower end is rotationally connected to the lower rear rod; and a crank, whose lower end is rotationally connected to the upper end of the link. , The upper end of the crank is fixedly connected with the strut to be driven to rotate by the strut, and when the strut is moved, the rear lever of the frame is switched between the extended state and the shortened state .

According to an embodiment of the present invention, the second linkage mechanism includes: a first link, a front end of the first link is rotatably connected to the front rod of the frame; a second link, the second link The front end of the second connecting rod is rotatably connected to the rear end of the first connecting rod, and the rear end of the second connecting rod is rotatably connected to the other end of the upper rear rod and the transmission rod, respectively. The relative rotation axis between the two links does not overlap with the relative rotation axis between the second link and the upper rear rod.

According to an embodiment of the present invention, the trolley further includes a connecting member, the connecting member is provided at a front end of the lower rear rod and is detachably connected to the lower rear rod, and the lower rear rod passes through the connecting member. It is rotatably connected with the connecting rod.

According to an embodiment of the present invention, the upper rear rod passes through the connecting member and is telescopically embedded in the lower rear rod. The connecting member includes a first connecting section and a second connecting section connected to each other. The first connecting section is exposed on the outside of the lower rear rod and is rotatably connected to the connecting rod; the second connecting section is embedded in the lower rear rod and is detachably connected to the lower rear rod .

According to an embodiment of the present invention, an end of the upper rear rod embedded in the lower rear rod is provided with an abutment block, and the abutment block may abut against an end of the second connecting section to limit the The length of the upper rear rod extending beyond the lower rear rod.

According to an embodiment of the present invention, a lateral width of the front wheel assembly is smaller than a lateral width of the rear wheel assembly. When the cart frame is in a folded state, the front wheel assembly is located at the rear in the lateral direction. Between wheel assemblies.

According to an embodiment of the present invention, the trolley further includes a seat rod, and the seat rod is rotatably connected to the lower push rod and the support rod, respectively, and as the trolley frame is unfolded and folded, the trolley The seat bar has a switchable expanded state and a folded state.

According to an embodiment of the present invention, the trolley further includes a handrail bar, and the handrail bar is rotatably connected to the lower push rod and the stay rod, respectively, and as the cart frame is unfolded and folded, The armrest has a switchable expanded state and a folded state.

According to an embodiment of the present invention, a lock member is provided on the lower rear lever, and a lock member is provided on the upper push rod. When in the folded state, the lock member can cooperate with the lock member to lock the The trolley is locked in the folded state.

Additional aspects and advantages of the present invention will be given in part in the following description, and part of them will become apparent from the following description, or be learned through the practice of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

1 is a schematic structural diagram of a hand cart in an unfolded state according to an embodiment of the present invention;

FIG. 2 is a partial structural diagram of the trolley shown in FIG. 1; FIG.

3 is a schematic structural view of a part of the trolley shown in FIG. 2;

FIG. 4 is a partial structural diagram of the trolley shown in FIG. 3; FIG.

5 is a schematic diagram of an assembly structure between an upper rear rod and a lower rear rod of a trolley according to an embodiment of the present invention;

6 is an exploded view of the structure shown in FIG. 5;

7 is a schematic structural diagram of an upper rear lever of a trolley according to an embodiment of the present invention;

8 is a schematic structural diagram of a connecting member of a trolley according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a trolley in a folding or unfolding process according to an embodiment of the present invention; FIG.

10 is a schematic structural diagram of a hand cart in a folded state according to an embodiment of the present invention;

FIG. 11 is a schematic view of the trolley shown in FIG. 10 from another angle.

Reference signs:

Trolley 100

Frame front rod 1;

Rear frame 2; upper rear 21; stop block 211;

Lower rear lever 22; locking member 221; snap-in position 222;

Pusher 3; Pusher 31; Locking member 311; Handle 312; Car button 3121;

Down putter 32;

First extension rod 4; stay rod 5; transmission rod 6;

First linkage mechanism 7; connecting rod 71; crank 72;

Second linkage mechanism 8; first link 81; second link 82;

Front wheel assembly 9; left front wheel 91; right front wheel 92

Rear wheel assembly 10; left rear wheel 101; right rear wheel 102;

Connecting piece 20; first connecting section 201; second connecting section 202; elastic buckle 2021;

Seat bar 30; armrest bar 40.

detailed description

Hereinafter, embodiments of the present invention will be described in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

A cart 100 according to an embodiment of the present invention is described below with reference to FIGS. 1 to 11.

As shown in FIG. 1 to FIG. 11, a cart 100 according to an embodiment of the present invention includes a cart frame, a front wheel assembly 9, and a rear wheel assembly 10, wherein the cart frame includes: a frame front rod 1, and a frame rear rod. 2. Push rod 3, first extension rod 4, support rod 5, transmission rod 6, first linkage mechanism 7 and second linkage mechanism 8. The cart frame has an unfolded state (refer to FIG. 1) and a folded state (refer to FIGS. 10 to 11).

Referring to FIGS. 1-4, the front frame rod 1 extends obliquely from front to back, and the front end of the front frame rod 1 is provided with a front wheel assembly 9. The rear frame rod 2 extends downwards from front to back. The rear frame rod 2 includes a lower rear rod 22 and an upper rear rod 21 which can be relatively slidably retracted. The rear frame rod 2 can be switched between an extended state and a shortened state. Specifically, when the lower rear lever 22 and the upper rear lever 21 are relatively slide-extended, the frame rear lever 2 may be switched to an extended state (refer to FIG. 1 to FIG. 4). When the relative sliding is shortened, the rear frame rod 2 can be switched to the shortened state (refer to FIGS. 10 to 11). A rear wheel assembly 10 is provided at the rear end of the lower rear lever 22. The putter 3 includes a lower putter 32 and an upper putter 31. Both the upper putter 31 and the lower putter 32 are inclined to extend upward from front to back. The front end of the lower putter 32 is rotatably connected to the front end of the upper rear lever 21. The rear end of 32 is rotatably connected to the front end of the upper push rod 31. The first extension rod 4 extends obliquely from front to back. The front end of the first extension rod 4 is rotatably connected to the rear end of the frame front rod 1. The rear end of the first extension rod 4 is fixedly connected to the front end of the upper rear rod 21. In the unfolded state, the first extension rod 4 and the frame front rod 1 are substantially in a straight line.

The front end of the stay 5 is rotatably connected to the upper rear bar 21, the rear end of the stay 5 is rotatably connected to the upper push rod 31, and a first linkage mechanism 7 is provided between the front end of the stay 5 and the lower rear 22. When the stay 5 moves, the first linkage mechanism 7 is driven to rotate to drive the relative sliding expansion between the upper rear lever 21 and the lower rear lever 22. One end of the transmission rod 6 is rotatably connected to the lower push rod 32, the front end of the second linkage mechanism 8 is rotatably connected to the front frame rod 1, and the rear end of the second linkage mechanism 8 is connected to the other end of the transmission rod 6 and the upper rear rod 21, respectively. When the trolley frame is folded, the transmission rod 6 rotates to drive the second linkage mechanism 8 to rotate to drive the front frame 1 of the frame toward the rear frame 2 of the frame.

Specifically, the upper push rod 31, the stay 5, the upper rear rod 21, and the lower push rod 32 constitute a first four-link mechanism, and the first four-link mechanism is moved to drive the cart frame in an unfolded state (see FIG. 1). (Shown in Fig. 10) and folded state (see Figs. 10-11). When the cart frame is folded, the rear end of the upper push rod 31 and the front end of the lower push rod 32 are close to each other, and the rear end of the lower push rod 32 and the rear end of the lower rear rod 22 are close to each other.

When the first four-link mechanism is moved and the cart frame is switched from the unfolded state (shown in FIG. 1) to the folded state (see FIGS. 10-11), the stay 5 drives the first linkage mechanism 7 The rear frame 2 of the driving frame is switched from the extended state to the shortened position, and at the same time, the transmission rod 6 drives the second linkage mechanism 8 to drive the front frame 1 of the frame to rotate backward so that the front end of the front frame 1 is directed toward the rear frame 2 The rear ends are closed to collapse; on the contrary, when the first four-link mechanism is moved and the cart frame is switched from the folded state (refer to FIG. 10 to FIG. 11) to the unfolded state (refer to FIG. 1) The support rod 5 drives the first linkage mechanism 7 to drive the rear frame 2 of the frame from the shortened state to the extended state, while the transmission rod 6 drives the second linkage mechanism 8 to drive the front frame 1 of the frame to rotate forward to make the front frame of the frame. The front end of 1 is far from the rear end of the rear frame rod 2 to open. The telescoping of the rear frame 2 and the folding and unfolding of the front frame 1 are synchronized with the folding and unfolding of the cart frame, thereby making the folding and unfolding operation of the cart 100 convenient and simple.

In the related art, the support bar of the trolley is rotationally connected to the lower rear bar. It can be understood that if the length of the lower rear bar is short, the connection point between the support bar and the lower rear bar is low. Insufficient force makes it difficult to achieve collapse; at the same time, the length of the brace will increase due to the lower connection point of the brace and the lower rear pole, so that after folding, the length of the brace will be higher than other parts, resulting in The overall height of the folded trolley is high.

In order to ensure that the trolley has sufficient driving force when it is collapsed, the length of the lower rear rod needs to be increased so that the connection position of the support rod and the lower rear rod is located at the middle or upper position of the rear rod of the entire frame. Although it can ensure that the trolley has sufficient driving force when it is collapsed, it can also prevent the length of the stay bar from being too long, but at this time, because the length of the lower rear bar is longer, the relative distance between the upper rear bar and the lower rear bar is caused. The telescopic amount is small, so the height of the folded trolley can only be reduced in a small range, and the effect is not obvious.

From the above, obviously, according to the cart 100 according to the embodiment of the present invention, not only the folding and unfolding operation of the cart 100 is convenient and concise, but also it is connected to the upper rear rod 21 through the support rod 5, and the connection point is relatively high. The driving force is sufficient, and the length of the stay 5 is moderate, so that the length of the folded back 5 is not too long. At the same time, the length of the lower rear rod 22 does not need to be long, so that the length of the upper rear rod 21 can be shortened. It is long, so that the overall height of the trolley 100 can be significantly reduced after being folded, and the overall structure of the trolley 100 is more compact, which is convenient to carry and store. That is, the trolley 100 of the present invention can take into account both the folding driving force and the folding height.

In addition, by providing the first extension rod 4, the length of the front rod 1 of the frame can be reduced. After the trolley 100 is folded, its overall height can be further reduced, and the overall structure of the trolley 100 is more compact, which is convenient to carry and store.

Understandably, when the stroller frame is folded, when the length of the front frame 1 and the rear frame 2 of the stroller are substantially equal, the overall height of the stroller 100 after folding is lower, and the overall structure of the stroller 100 is more compact. Therefore, on the premise of ensuring that the overall structure of the trolley 100 is reasonable and coordinated, when the length of the first extension rod 4 is different, the required relative telescopic distance between the upper rear rod 21 and the lower rear rod 22 is also different. The longer the length of the rod 4, the shorter the length of the front rod 1 of the frame, and the longer the relative telescopic distance between the upper rear rod 21 and the lower rear rod 22 is longer; when the length of the first extension rod 4 is shorter, The longer the length of the front rod 1 of the frame, the shorter the relative telescopic distance between the upper rear rod 21 and the lower rear rod 22 at this time.

That is, on the premise of ensuring that the overall structure of the trolley 100 is reasonable and coordinated, in order to make the overall height of the trolley 100 folded lower and the structure more compact, according to the length of the first extension rod 4, the upper rear rod 21 is opposite to the lower rear rod 22. The telescopic distance needs to be different, and when the relative telescopic distance of the upper rear rod 21 and the lower rear rod 22 needs to be different, by adjusting the length of the lower rear rod 22, different lengths of contraction distance can be obtained. 5 The rotation is connected to the upper rear rod 21, and the adjustment of the length of the lower rear rod 22 has no other effect on the realization of the entire structural function of the hand cart 100, thereby making the hand cart 100 of the present invention more versatile.

It should be noted that, as shown in FIG. 1, the orientations used by the components of the hand cart 100 when describing the structure are described in the unfolded state of the hand cart 100, and the direction of travel of the hand cart 100 is used herein as the hand cart. The front side of 100 uses the backward direction of the trolley 100 as the rear side of the trolley 100, the gravity direction received by the trolley 100 as the lower side, and the direction opposite to the gravity direction as the upper side, and the left and right sides are in the above directions. Based on the foundation, the left-right direction is a direction perpendicular to the up-down direction and the front-back direction.

Understandably, the folding and unfolding of the cart frame is achieved by the above-mentioned first four-link mechanism. To lock the state of the cart frame, for example, to lock the cart frame in the unfolded state, The relative positions of any two members of the first four-link mechanism are locked, so that the first four-link mechanism will constitute a triangular support structure, and the first four-link mechanism will not be movable, thereby realizing the state of the cart frame. Lock, when you need to switch the state, you can unlock the two components.

For example, in the specific examples shown in FIG. 1 to FIG. 11, the push rod 3 has a locked state and a released state. In the locked state, the push rod 32 and the upper push rod 31 cannot rotate relative to each other, and in the released state, the push rod 32 and push upward The lever 31 is relatively rotatable. When the push rod 3 is in the released state, the first four-link mechanism can be moved to drive the cart frame to switch between the unfolded state and the folded state. When the push rod 3 is in the locked state, the first four-link mechanism constitutes a triangular support. The structure locks the cart frame.

Further, as shown in FIG. 1, the trolley 100 further includes a retract button 3121. The retract button 3121 is used to control the push rod 3 to switch from the locked state to the released state. 3 Switch from the locked state to the released state, so that the first four-link mechanism is movable, and the upper push rod 31 is pushed upward, and the first four-link mechanism moves accordingly to switch the cart frame to the folded state.

Optionally, as shown in FIG. 1, the rear end of the push rod 3 forms a handle portion 312, and the retract button 3121 is disposed on the handle portion 312, thereby facilitating manipulation.

In an embodiment of the present invention, referring to FIGS. 1-4, the first linkage mechanism 7 includes a link 71 and a crank 72. The lower end of the link 71 is rotatably connected to the lower rear rod 22, and the lower end of the crank 72 and The upper end of the connecting rod 71 is rotatably connected, and the upper end of the crank 72 is fixedly connected with the stay 5 to be driven to rotate by the stay 5. When the stay 5 moves, the rear rod 2 of the frame is switched between the extended state and the shortened state. Specifically, the connecting rod 71, the crank 72, the upper rear lever 21 and the lower rear lever 22 constitute a crank slider mechanism. When the stay 5 is moved, the stay 5 drives the crank 72 to rotate, thereby driving the crank slider mechanism to move, thereby The frame rear lever 2 is switched between an extended state and a shortened state. The first linkage mechanism 7 has a simple structure and a stable and reliable driving process.

Advantageously, the crank 72 and the stay 5 are integrally formed, and the crank 72 is formed by bending and extending the front end of the stay 5, thereby not only simplifying the production and assembly processes of the crank 72 and the stay 5, but also making the crank 72 and The connection strength between the stays 5 is high and it is not easy to break.

Of course, the present invention is not limited to this. The crank 72 and the stay 5 can also be separately formed, and then the crank 72 and the stay 5 are connected. For example, the crank 72 and the stay 5 can be connected by welding or bolting. The connection makes the manufacturing process of the crank 72 and the stay 5 more diversified.

In an alternative embodiment of the present invention, referring to FIGS. 4-8, the trolley 100 further includes a connecting member 20, which is provided at the front end of the lower rear rod 22 and is detachably connected to the lower rear rod 22. The lower rear lever 22 is rotatably connected with the connecting rod 71 through the connecting member 20. By providing the connecting member 20, the connection between the lower rear rod 22 and the connecting rod 71 is more flexible and convenient.

Further, referring to FIG. 4 to FIG. 8, the upper rear rod 21 passes through the connecting member 20 and is telescopically embedded in the lower rear rod 22. The connecting member 20 includes a first connecting section 201 and a second connecting section connected to each other. In the connecting section 202, the first connecting section 201 is exposed on the outside of the lower rear rod 22 and is rotatably connected with the link 71. The second connecting section 202 is embedded in the lower rear rod 22 and is detachably connected to the lower rear rod 22. As a result, the connection between the connecting member 20 and the connecting rod 71 and the connecting member 20 and the lower rear lever 22 is more convenient.

In an alternative embodiment of the present invention, referring to FIGS. 5-6 and 8, one of the lower rear lever 22 and the connecting member 20 is provided with an elastic buckle 2021, and the lower rear lever 22 and the connecting member 20 are provided. The other of them is provided with a latching position 222 (such as a latching hole or a latching slot) adapted to the elastic latching 2021.

In this embodiment, the following specific examples are included: an elastic buckle 2021 is provided on the lower rear rod 22, and a connecting position 222 adapted to the elastic buckle 2021 is provided on the connecting member 20. Alternatively, the connecting member 20 is provided with an elastic buckle 2021, and the lower rear rod 22 is provided with a latching position 222 adapted to the elastic buckle 2021. Through the cooperation between the elastic buckle 2021 and the latching position 222, the connection between the lower rear rod 22 and the connecting member 20 is realized, the connection structure is simple, and the disassembly and assembly are convenient.

Advantageously, referring to FIG. 6 to FIG. 7, an end of the upper rear lever 21 embedded in the lower rear lever 22 is provided with a stop block 211, and the stop block 211 may abut against the end of the second connection section 202 to The length of the upper rear rod 21 protruding out of the lower rear rod 22 is restricted, so that the upper rear rod 21 can be prevented from sliding out of the upper rear rod 21.

In an embodiment of the present invention, referring to FIGS. 1-4, the second linkage mechanism 8 includes a first link 81 and a second link 82. The front end of the first link 81 is connected to the frame front rod 1. The front end of the second link 82 is rotatably connected to the rear end of the first link 81, and the rear end of the second link 82 is rotatably connected to the other ends of the upper rear lever 21 and the transmission lever 6, respectively. The rear end of the two links 82 is rotatably connected to the upper rear rod 21, while the rear end of the second link 82 is rotatably connected to the other end of the transmission rod 6, and the relative rotation axis between the transmission rod 6 and the second link 82 is The relative rotation axes between the second link 82 and the upper rear lever 21 do not overlap. The first link 81, the second link 82, the upper rear lever 21 and the frame front lever 1 constitute a second four-link mechanism, and the second four-link mechanism and the first four-link mechanism are linked through a transmission rod 6, When the first four-link mechanism is moved so that the cart frame is in the unfolded state shown in FIG. 1, the second four-link mechanism is moved to move the front end of the frame front rod 1 away from the frame rear rod 2. Rear end, when the first four-link mechanism moves to make the cart frame in the folded state shown in Figs. 10-11, the second four-link mechanism moves to move the front of the front rod 1 of the frame toward The rear end of the frame rear lever 2 is closed. The second linkage mechanism 8 has a simple structure and a stable and reliable driving process.

Understandably, when the first four-link mechanism constitutes a triangular support structure, the relative positions of the second link 82 and the upper rear lever 21 are locked, so that the second four-link mechanism also constitutes a triangular support structure, so that The position of the frame front rod 1 is locked.

In an embodiment of the present invention, referring to FIG. 10 to FIG. 11, the lateral width of the front wheel assembly 9 is smaller than the lateral width of the rear wheel assembly 10. When the cart frame is in a folded state, the front wheel assembly 9 is along the The lateral direction is located between the rear wheel assemblies 10. Specifically, referring to FIG. 1, the front frame 1 and the rear frame 2 of the trolley 100 are arranged in pairs in the left and right directions. Correspondingly, the front wheel assembly 9 includes left front wheels 91 that are oppositely disposed in the left and right directions. And right front wheel 92, the left front wheel 91 is provided at the bottom of the left frame front rod 1, the right front wheel 92 is provided at the bottom of the right frame front rod 1, and the rear wheel assembly 10 includes left The rear wheel 101 and the right rear wheel 102, the left rear wheel 101 is provided at the bottom of the left frame rear rod 2 and the right rear wheel 102 is provided at the bottom of the right frame rear rod 2.

It should be noted that the “lateral” described here is the left-right direction shown in FIG. 1. The lateral width of the front wheel assembly 9 is the distance between the left front wheel 91 and the right front wheel 92, and the lateral width of the rear wheel assembly 10 is the distance between the left rear wheel 101 and the right rear wheel 102. The left front wheel 91 and the right The distance between the front wheels 92 is smaller than the distance between the left rear wheel 101 and the right rear wheel 102. When the cart frame is folded, the left front wheel 91 and the right front wheel 92 are located on the left rear wheel 101 and the right rear wheel. Between 102. In this way, the structure of the trolley 100 in the folded state can be made more compact and the overall volume smaller, thereby further facilitating the carrying and storage of the trolley 100.

In one embodiment of the present invention, the trolley 100 further includes a seat bar 30, which is rotatably connected to the lower push rod 32 and the stay 5 respectively. With the deployment and folding of the cart frame, the seat bar 30 has a switchable The unfolded state (as shown in FIG. 1 of the seat post 30 is in a substantially horizontal state) and the folded state (as shown in FIG. 10 to FIG. 11 of the seat post 30 is in a substantially vertical state). Specifically, the upper push rod 31, the support rod 5, the seat rod 30, and the lower push rod 32 may constitute a third four-link mechanism, and the third four-link mechanism and the first four-link mechanism share the upper push rod 31, the support rod 5 and the lower push rod 32, whereby the third four-link mechanism is linked with the first four-link mechanism, and when the first four-link mechanism is moved, the cart frame is in the unfolded state as shown in FIG. The third four-link mechanism moves accordingly to make the seat bar 30 in the unfolded state as shown in FIG. 1, and when the first four-link mechanism moves to make the cart frame as shown in FIGS. 10-11 In the folded state, the third four-bar linkage mechanism moves accordingly so that the seat bar 30 is in the folded state as shown in FIGS. 1 to 11. As a result, the seat bar 30 is unfolded and folded in synchronization with the unfolding and folding of the cart frame, and the folding and unfolding operation of the cart 100 is convenient and simple.

Understandably, when the first four-link mechanism constitutes a triangular support structure, the third four-link mechanism also constitutes a triangular support structure, so that the position of the seat rod 30 is locked.

In one embodiment of the present invention, the trolley 100 further includes an armrest bar 40, which is rotatably connected to the lower push rod 32 and the stay 5 respectively. With the deployment and folding of the cart frame, the armrest bar 40 has a switchable The unfolded state (as shown in the armrest lever 40 in FIG. 1 is in a substantially horizontal state) and the folded state (as shown in the armrest lever 40 in FIG. 10 to FIG. 11 is in a substantially vertical state). Specifically, the upper push rod 31, the stay 5, the armrest 40, and the lower push 32 may constitute a fourth four-link mechanism, and the fourth four-link mechanism and the first four-link mechanism share the upper push rod 31, the stay 5 and the lower push rod 32, so that the fourth four-link mechanism is linked with the first four-link mechanism, and when the first four-link mechanism is moved, the cart frame is in the unfolded state as shown in FIG. The fourth four-link mechanism moves accordingly to make the handrail 40 in the unfolded state as shown in FIG. 1, and when the first four-link mechanism moves to make the cart frame as shown in FIGS. 10-11 In the folded state, the fourth four-link mechanism moves accordingly, so that the armrest bar 40 is in the folded state as shown in FIGS. 10-11. As a result, the handrail bar 40 is unfolded and folded in synchronization with the unfolding and folding of the cart frame, and the folding and unfolding operation of the cart 100 is convenient and simple.

Understandably, when the first four-link mechanism constitutes a triangular support structure, the fourth four-link mechanism also constitutes a triangular support structure, so that the position of the armrest lever 40 is locked.

In an embodiment of the present invention, referring to FIG. 1 and FIGS. 10 to 11, a locking member 221 is provided on the lower rear lever 22, and a locking member 311 is provided on the upper push rod 31. In the folded state, The locking member 221 can cooperate with the locking member 311 to lock the trolley 100 in a folded state. As a result, the structure of the cart 100 in the folded state is more stable, and the cart 100 will not be unfolded because a part of the cart 100 is pulled. When the cart 100 needs to be unfolded, the unlocking member 221 may cooperate with the locking member 311.

In an optional embodiment of the present invention, the trolley 100 further includes a second extension rod (not shown), the second extension rod extends obliquely from front to back, and the front end of the second extension rod is opposite to the front end of the upper rear rod 21 Fixedly connected, the rear end of the second extension rod is rotationally connected to the front end of the lower push rod 32. In the unfolded state, the second extension rod and the lower push rod 32 are substantially on a straight line. By providing the second extension rod, the length of the push rod 3 can be reduced, thereby further reducing the height of the trolley 100 in the folded state.

In the description of the present invention, it should be noted that the terms "installation", "connected", and "connected" should be understood in a broad sense unless otherwise specified and limited. For example, they may be fixed connections or removable. Connected or integrated; it can be mechanical or electrical; it can be directly connected or indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the description of the present invention, unless explicitly stated and defined otherwise, the "first" or "under" of the second feature may include direct contact between the first and second features, and may also include the first and second features. The second feature is not a direct contact but a contact through another feature between them. Moreover, the first feature is "above", "above", and "above" the second feature, including that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature is higher in level than the second feature. The first feature is “below”, “below”, and “below” of the second feature, including the fact that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature is less horizontal than the second feature.

In the description of this specification, the description with reference to the terms “one embodiment”, “some embodiments”, “exemplary embodiments”, “examples”, “specific examples”, or “some examples”, etc., means in combination with the implementation The specific features, structures, materials, or characteristics described in the examples or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirit of the present invention, The scope of the invention is defined by the claims and their equivalents.

Claims

A trolley includes a trolley frame with an unfolded state and a folded state, a front wheel assembly and a rear wheel assembly, characterized in that the trolley frame includes:

A front rod of a frame, the front rod of the frame extending obliquely upward from front to rear;

A rear rod of the frame, the rear rod of the frame extending downward from the front to the rear, the rear rod of the frame includes a lower rear rod and an upper rear rod that can slide and retract relatively, and the rear rod of the frame can be in an extended state And shortened state;

A putter, the putter includes a lower putter and an upper putter, and both the upper putter and the lower putter extend obliquely from front to back, and the front end of the lower putter and the front end of the upper rear stick Rotationally connected, the rear end of the lower push rod is rotationally connected with the front end of the upper push rod;

A first extension rod that extends obliquely upwards from front to back, a front end of the first extension rod is rotatably connected to a rear end of a frame front rod, and a rear end of the first extension rod is connected to an upper rear rod The front end of the frame is fixedly connected, and in the expanded state, the first extension rod and the front frame rod are generally in a straight line;

A strut, the front end of the strut is rotatably connected to the upper rear rod, the rear end of the strut is rotatably connected to the upper push rod; a first linkage is provided between the front end of the strut and the lower rear rod A mechanism that drives the first linkage mechanism to rotate to drive the relative sliding telescopic movement between the upper rear lever and the lower rear lever when the brace is moved;

A transmission rod, one end of which is rotatably connected with the lower push rod;

A second linkage mechanism, a front end of the second linkage mechanism is rotatably connected to the front frame rod, and a rear end of the second linkage mechanism is rotatably connected to the other end of the transmission rod and the upper rear rod, When the cart frame is folded, the transmission rod rotates to drive the second linkage mechanism to rotate to drive the front rod of the frame toward the rear rod of the frame.
The trolley according to claim 1, wherein the first linkage mechanism comprises:

A connecting rod whose lower end is rotatably connected to the lower rear rod;

A crank, the lower end of the crank is rotatably connected with the upper end of the connecting rod, the upper end of the crank is fixedly connected with the stay bar to be driven to rotate by the stay bar, and the frame is driven when the stay bar moves The rear lever is switched between the extended state and the shortened state.
The trolley according to claim 1, wherein the second linkage mechanism comprises:

A first link, wherein a front end of the first link is rotatably connected to a front rod of the frame;

A second link, wherein the front end of the second link is rotatably connected to the rear end of the first link, and the rear end of the second link is respectively connected to the other end of the upper rear rod and the transmission rod; In a rotational connection, the relative rotation axis between the transmission lever and the second link does not overlap with the relative rotation axis between the second link and the upper rear lever.
The trolley according to claim 2, further comprising a connecting member provided at a front end of the lower rear rod and detachably connected to the lower rear rod, the lower rear rod passing through the lower rear rod The connecting member is rotatably connected with the connecting rod.
The trolley according to claim 4, wherein the upper rear rod passes through the connecting member and is telescopically embedded in the lower rear rod, and the connecting member includes first connecting sections connected to each other And a second connection section, the first connection section is exposed outside the lower rear rod and is rotatably connected to the connecting rod, and the second connection section is embedded in the lower rear rod and connected to the lower rod. The rear rod is detachably connected.
The trolley according to claim 5, wherein an end of the upper rear rod embedded in the lower rear rod is provided with a stop block, and the stop block can be connected to an end of the second connection section. Abutting to limit the length of the upper rear rod protruding from the lower rear rod.
The trolley according to claim 1, wherein the lateral width of the front wheel assembly is smaller than the lateral width of the rear wheel assembly, and when the cart frame is in a folded state, the front wheel assembly The direction is between the rear wheel assemblies.
The trolley according to claim 1, further comprising a seat rod, the seat rod being rotatably connected to the lower push rod and the stay rod, respectively, as the trolley frame is unfolded and folded, The seat bar has a switchable expanded state and a folded state.
The trolley according to claim 1, further comprising a handrail bar, the handrail bar being rotatably connected to the lower push rod and the stay bar, respectively, as the cart frame is unfolded and folded, The handrail has a switchable expanded state and a folded state.
The trolley according to any one of claims 1-9, wherein a lock member is provided on the lower rear rod, and a lock member is provided on the upper push rod, and the lock is in a folded state. A piece can cooperate with the locking piece to lock the trolley in a folded state.