CN111361626A - Linkage folding cart - Google Patents

Abstract

The invention discloses a linkage folding cart which comprises a frame front rod, a frame rear rod, a push rod and a support rod, wherein the frame rear rod comprises a lower rear rod and an upper rear rod arranged above the lower rear rod; the lower end of the connecting rod is rotatably connected with the lower rear rod; 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 support rod to be driven by the support rod to rotate, and the connecting rod, the crank, the upper rear rod and the lower rear rod form a crank slider mechanism to drive the frame rear rod to be switched between an extension state and a contraction state when the support rod moves. The linked folding cart has enough driving force and lower overall height after being folded.

Description

Linkage folding cart

Technical Field

The invention relates to the technical field of trolleys, in particular to a linkage folding trolley.

Background

The size is great after the handcart among the prior art is folding, and is highly higher moreover, conveniently deposits and carries after folding, does not have the portability, can't compromise folding drive power and folding height.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a linked folding stroller, which has sufficient driving force and low overall height after folding.

The linked folding cart comprises a frame front rod, wherein the frame front rod extends upwards in an inclined mode from front to back; the rear end of the front frame rod and the rear end of the lower rear rod are far away from each other to be unfolded at the first position, and the front end of the front frame rod and the rear end of the lower rear rod are close to each other to be stored at the second position; the push rod comprises a lower push rod and an upper push rod, the upper push rod and the lower push rod both extend obliquely upwards from front to back, the front end of the lower push rod is rotatably connected with the front end of the upper rear rod, the rear end of the lower push rod is rotatably connected with the front end of the upper push rod, the push rod has a locking state and a releasing state, the lower push rod and the upper push rod cannot relatively rotate in the locking state, and the lower push rod and the upper push rod can relatively rotate in the releasing state; the front end of the support rod is rotatably connected with the upper rear rod, and the rear end of the support rod is rotatably connected with the upper push rod; the upper push rod, the support rod, the upper rear rod and the lower push rod form a first four-bar linkage mechanism, the trolley has an unfolding state and a storage state, when the push rod is in the releasing state, the first four-bar linkage mechanism can move to drive the trolley to be switched between the unfolding state and the storage state, when the trolley is stored, the rear end of the upper push rod and the front end of the lower push rod are close to each other to be folded, the rear end of the lower push rod and the rear end of the lower rear rod are close to each other to be folded, and when the push rod is in the locking state, the first four-bar linkage mechanism forms a triangular support structure to lock the trolley in the unfolding state or the storage state; the first four-bar linkage mechanism is respectively linked with the front frame rod and the rear frame rod so as to drive the front frame rod to switch between the first position and the second position and drive the rear frame rod to switch between the extended state and the shortened state;

the lower end of the connecting rod is rotatably connected with the lower rear rod; 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 so as to be driven by the stay bar to rotate, and the connecting rod, the crank, the upper rear rod and the lower rear rod form a crank slider mechanism so as to drive the frame rear rod to be switched between the extension state and the contraction state when the stay bar moves; the front end of the first connecting rod is rotationally connected with the frame front rod; the front end of the second connecting rod is rotationally connected with the rear end of the first connecting rod, the rear end of the second connecting rod is rotationally connected with the upper rear rod, and the first connecting rod, the second connecting rod, the upper rear rod and the frame front rod form a second four-bar linkage; one end of the transmission rod is rotatably connected with the lower push rod, the other end of the transmission rod is rotatably connected with the second connecting rod, a relative rotation axis between the transmission rod and the second connecting rod is not overlapped with a relative rotation axis between the second connecting rod and the upper rear rod, the first four-bar linkage mechanism drives the transmission rod to drive the second four-bar linkage mechanism to move when moving, so that the frame front rod is switched between the first position and the second position, when the first four-bar linkage mechanism forms a triangular support structure, the second four-bar linkage mechanism also forms a triangular support structure, and the frame front rod is locked at the first position or the second position.

According to the trolley provided by the embodiment of the invention, the trolley which is folded and unfolded in a linkage manner is convenient and concise to operate, and is connected to the upper rear rod through the rotation of the support rod, the connecting point is higher, the driving force is sufficient during folding, the length of the support rod is moderate, the problem of overlong length of the folded support rod can be avoided, and meanwhile, the length of the lower rear rod is not required to be very long, so that the length of the upper rear rod which can be contracted is longer, in addition, the length of the front rod of the trolley frame can be reduced through the arrangement of the first extension rod, the overall height of the trolley can be obviously reduced after the trolley is folded, the integral structure of the trolley is more compact.

In addition, when the distance that last back pole and back pole are flexible relatively needs to be different down, only can obtain the shrink distance of different length through the length of adjusting back pole down, and the regulation of back pole length down has no other influence to the realization of the whole structural function of handcart.

In addition, the linked folding cart according to the embodiment of the present invention may further have the following additional technical features:

according to one embodiment of the invention, the device further comprises a connecting piece, wherein the connecting piece is detachably connected with the lower rear rod, and the lower rear rod is rotatably connected with the connecting rod through the connecting piece.

According to an embodiment of the present invention, the upper rear rod is telescopically embedded in the lower rear rod, the connector is externally fitted on the outer peripheral wall of the upper rear rod, the connector includes a first connecting section and a second connecting section connected to each other, the first connecting section is exposed to the outside of the lower rear rod and rotatably connected to the connecting rod, and the second connecting section is embedded in the lower rear rod and detachably connected to the lower rear rod.

According to one embodiment of the invention, one end of the upper rear rod, which is embedded into the lower rear rod, is provided with a stop block, and the stop block can be abutted against the end of the second connecting section to limit the length of the upper rear rod extending out of the lower rear rod.

According to one embodiment of the invention, the bicycle frame further comprises a first extension rod, the first extension rod extends upwards in an inclined manner from front to back, the front end of the first extension rod is rotatably connected with the rear end of the bicycle frame front rod, the rear end of the first extension rod is fixedly connected with the front end of the upper rear rod, and in the unfolded state, the first extension rod and the bicycle frame front rod are substantially in the same line.

According to an embodiment of the invention, the extension rod further comprises a second extension rod, the second extension rod extends upwards in an inclined manner from front to back, the front end of the second extension rod is fixedly connected with the front end of the upper rear rod, the rear end of the second extension rod is rotatably connected with the front end of the lower push rod, and in the unfolded state, the second extension rod and the lower push rod are substantially in the same line.

According to an embodiment of the invention, the seat device further comprises a seat rod, the seat rod has a horizontal state and a vertical state, the seat rod is respectively rotatably connected with the lower push rod and the support rod, the upper push rod, the support rod, the seat rod and the lower push rod can form a third four-bar linkage mechanism, when the push rod is in the release state, the third four-bar linkage mechanism can be moved to drive the seat rod to switch between the horizontal state and the vertical state, and when the push rod is in the locking state, the third four-bar linkage mechanism forms a triangular support structure to lock the seat rod in the horizontal state or the vertical state.

According to an embodiment of the present invention, the foldable handrail further includes a handrail rod, the handrail rod has a horizontal state and a vertical state, the handrail rod is respectively rotatably connected to the lower push rod and the support rod, the upper push rod, the support rod, the handrail rod and the lower push rod can form a fourth four-bar linkage mechanism, when the push rod is in the release state, the fourth four-bar linkage mechanism can move to drive the handrail rod to switch between the horizontal state and the vertical state, and when the push rod is in the locking state, the fourth four-bar linkage mechanism forms a triangular support structure to lock the handrail rod in the horizontal state or the vertical state.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

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

fig. 1 is a schematic structural view of a linked folding stroller in an unfolded state according to an embodiment of the present invention.

Fig. 2 is a partial structural schematic view of the linked folding cart shown in fig. 1.

Fig. 3 is a partial structural schematic view of the linked folding cart shown in fig. 2.

Fig. 4 is a partial structural schematic view of the linked folding cart shown in fig. 3.

Fig. 5 is a schematic view of an assembly structure between the upper rear rod and the lower rear rod of the linked folding cart according to the embodiment of the present invention.

Fig. 6 is an exploded view of the structure shown in fig. 5.

Fig. 7 is a schematic structural view of an upper rear rod of the linked folding cart according to the embodiment of the present invention.

Fig. 8 is a schematic structural diagram of a connecting member of a linked folding cart according to an embodiment of the present invention.

Fig. 9 is a schematic structural diagram of the linked foldable stroller in the folding or unfolding process according to the embodiment of the invention.

Fig. 10 is a schematic structural view of the linked foldable stroller in a folded state according to the embodiment of the invention.

Fig. 11 is a schematic view of another angle of the linkage collapsed stroller shown in fig. 10.

Reference numerals:

a cart 100;

a frame front bar 1;

a frame rear rod 2; an upper rear bar 21; a stop block 211;

a lower rear bar 22; a locking member 221; a card location 222;

a push rod 3; an upper push rod 31; a locking piece 311; a handle portion 312; a vehicle-receiving button 3121;

a lower push rod 32;

a first extension rod 4; a stay bar 5; a transmission rod 6;

a first link mechanism 7; a connecting rod 71; a crank 72;

a second linkage mechanism 8; the first link 81; a second link 82;

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

A rear wheel assembly 10; a left rear wheel 101; a right rear wheel 102;

a connecting member 20; a first connection section 201; a second connection section 202; an elastic buckle 2021;

a seat post 30; a grab bar 40.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

A linked folding cart 100 according to an embodiment of the present invention is described below with reference to fig. 1-11.

Referring to fig. 1 to 11, the linked folding cart 100 according to the 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: the 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, a transmission rod 6, a first linkage mechanism 7 and a second linkage mechanism 8. The stroller frame has an unfolded state (shown with reference to fig. 1) and a folded state (shown with reference to fig. 10-11).

Referring to fig. 1 to 4, a frame front bar 1 extends obliquely upward from front to rear, and a front end of the frame front bar 1 is provided with a front wheel assembly 9. The frame rear rod 2 extends downward from front to rear, the frame rear rod 2 includes a lower rear rod 22 and an upper rear rod 21 which are relatively slidable and retractable, and the frame rear rod 2 is switchable between an extended state and a shortened state, specifically, when the lower rear rod 22 and the upper rear rod 21 are relatively slidably extended, the frame rear rod 2 is switchable to the extended state (shown in fig. 1 to 4), and when the lower rear rod 22 and the upper rear rod 21 are relatively slidably shortened, the frame rear rod 2 is switchable to the shortened state (shown in fig. 10 to 11). The rear end of the lower rear lever 22 is provided with the rear wheel assembly 10. The push rod 3 comprises a lower push rod 32 and an upper push rod 31, the upper push rod 31 and the lower push rod 32 both extend obliquely upwards from front to back, the front end of the lower push rod 32 is rotatably connected with the front end of the upper rear rod 21, and the rear end of the lower push rod 32 is rotatably connected with the front end of the upper push rod 31. The first extension rod 4 extends obliquely upwards from front to back, the front end of the first extension rod 4 is rotatably connected with the rear end of the frame front rod 1, the rear end of the first extension rod 4 is fixedly connected with the front end of the upper rear rod 21, and the first extension rod 4 and the frame front rod 1 are substantially in a straight line in an unfolded state.

The front end of the stay bar 5 is rotatably connected with the upper rear bar 21, the rear end of the stay bar 5 is rotatably connected with the upper push rod 31, and a first linkage mechanism 7 is arranged between the front end of the stay bar 5 and the lower rear bar 22. When the support rod 5 moves, the first linkage mechanism 7 is driven to rotate so as to drive the relative sliding and stretching between the upper rear rod 21 and the lower rear rod 22. One end of the transmission rod 6 is rotatably connected with the lower push rod 32, the front end of the second linkage mechanism 8 is rotatably connected with the frame front rod 1, the rear end of the second linkage mechanism 8 is rotatably connected with the other end of the transmission rod 6 and the upper rear rod 21 respectively, and when the stroller frame is folded, the transmission rod 6 rotates to drive the second linkage mechanism 8 to rotate so as to drive the frame front rod 1 to approach the frame rear rod 2.

Specifically, the upper push rod 31, the stay 5, the upper rear rod 21, and the lower push rod 32 constitute a first four-bar linkage mechanism that is movable to switch the stroller frame between the unfolded state (see fig. 1) and the folded state (see fig. 10 to 11). When the stroller 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-bar linkage mechanism moves to switch the stroller frame from the unfolding state (shown in fig. 1) to the folding state (shown in fig. 10-11), the stay rod 5 drives the first linkage mechanism 7 to drive the frame rear rod 2 to switch from the stretching state to the shortening state, and simultaneously the transmission rod 6 drives the second linkage mechanism 8 to drive the frame front rod 1 to rotate backwards so that the front end of the frame front rod 1 is drawn close to the rear end of the frame rear rod 2 to be folded; conversely, when the first four-bar linkage is activated to switch the stroller frame from the folded state (see fig. 10-11) to the unfolded state (see fig. 1), the strut 5 drives the first linkage 7 to drive the rear frame rod 2 to switch from the shortened state to the extended state, and the transmission rod 6 drives the second linkage 8 to drive the front frame rod 1 to rotate forward so that the front end of the front frame rod 1 is far away from the rear end of the rear frame rod 2 to be unfolded. The expansion and contraction of the frame rear rod 2 and the folding and unfolding of the frame front rod 1 are synchronously carried out along with the folding and unfolding of the frame of the cart, so that the cart 100 is convenient and simple to fold and unfold.

In the related art, the stay bar of the handcart is rotatably connected to the lower rear bar, so that the connection point between the stay bar and the lower rear bar is low if the lower rear bar is short, and the handcart is difficult to fold due to insufficient driving force when being folded; simultaneously because the stay bar is lower with the hookup site of back bar down, the length of stay bar will increase, and after folding like this, the length of stay bar will exceed other parts to it is higher to cause the whole height after the handcart is folded.

And if in order to guarantee that the handcart has sufficient drive power when closing, then need increase down the length of back pole, make the hookup point of vaulting pole and back pole down be located whole frame back pole in the middle of or the position on the upper side in the middle of, although can guarantee that the handcart has sufficient drive power when closing this moment, also can avoid vaulting pole length overlength simultaneously, but this moment because the length of back pole down is longer, thereby it is less to cause the relative flexible volume between back pole and the back pole down, consequently also can only reduce the height after the handcart is folded in the minizone, the effect is not obvious.

From the above, it is obvious that, according to the cart 100 of the embodiment of the present invention, not only the folding and unfolding operations of the cart 100 are convenient and simple, but also the brace 5 is rotatably connected to the upper rear rod 21, the connection point is relatively high, the driving force is sufficient during folding, and the length of the brace 5 is moderate, so that the problem of too long length of the folded brace 5 does not occur, and meanwhile, the length of the lower rear rod 22 does not need to be very long, so that the length of the upper rear rod 21 which can be contracted is relatively long, and further, the overall height of the cart 100 after folding can be significantly reduced, and the cart 100 has a more compact overall structure, and is convenient to carry and store. That is, the cart 100 of the present invention can achieve both the folding driving force and the folding height.

In addition, through setting up first extension rod 4, can reduce the length of frame front rod 1, after shallow 100 is folding, its whole height can further reduce, and shallow 100 overall structure is compacter, conveniently carries and stores.

It can be understood that when the length of the frame front rod 1 and the frame rear rod 2 is substantially equal when the stroller frame is folded, the overall height of the stroller 100 after being folded is lower, and the overall structure of the stroller 100 is more compact. Therefore, on the premise of ensuring the reasonable and coordinated overall structure of the cart 100, when the lengths of the first extension rods 4 are different, the required relative telescopic distance between the upper rear rod 21 and the lower rear rod 22 is also different, for example, when the length of the first extension rod 4 is longer, the length of the frame front rod 1 is shorter, and the required relative telescopic distance between the upper rear rod 21 and the lower rear rod 22 is longer; the shorter the length of the first extension rod 4, the longer the length of the frame front rod 1, and the shorter the required relative telescopic distance between the upper rear rod 21 and the lower rear rod 22.

That is, on the premise of ensuring the reasonable and coordinated overall structure of the cart 100, in order to make the overall height of the cart 100 after being folded lower and the structure more compact, the relative telescopic distances between the upper rear rod 21 and the lower rear rod 22 are different according to the different lengths of the first extension rod 4, and when the relative telescopic distances between the upper rear rod 21 and the lower rear rod 22 are different, the telescopic distances with different lengths can be obtained by adjusting the length of the lower rear rod 22, and since the stay 5 in the present invention is rotatably connected to the upper rear rod 21, the adjustment of the length of the lower rear rod 22 has no other influence on the realization of the overall structural function of the cart 100, thereby making the cart 100 of the present invention have better versatility.

It should be noted that, as shown in fig. 1, the directions referred to in describing the structure of the components of the cart 100 are all described in the unfolded state of the cart 100, and the traveling direction of the cart 100 is taken as the front side of the cart 100, the reverse direction of the cart 100 is taken as the rear side of the cart 100, the direction of the gravity applied to the cart 100 is taken as the lower side, the direction opposite to the direction of the gravity is taken as the upper side, and the left side and the right side are established on the basis of the above directions, and the left-right direction is a direction perpendicular to the up-down direction and the front-back direction.

It will be appreciated that folding and unfolding of the stroller frame is achieved by movement of the first four bar linkage as described above, and that if the state of the stroller frame is to be locked, for example, the stroller frame is to be locked in the unfolded state, by locking the relative positions of any two members in the first four bar linkage, such that the first four bar linkage will form a triangular support structure, the first four bar linkage will not be movable, thereby achieving locking of the stroller frame state, and unlocking of the two members when switching of the state is required.

For example, in the specific example shown in fig. 1 to 11, the push rod 3 has a locked state in which the push rod 32 and the upper push rod 31 are not relatively rotatable, and a released state in which the push rod 32 and the upper push rod 31 are relatively rotatable. When the push rod 3 is in a releasing state, the first four-bar linkage mechanism can move to drive the stroller frame to switch between an unfolding state and a folding state, and when the push rod 3 is in a locking state, the first four-bar linkage mechanism forms a triangular support structure to lock the state of the stroller frame.

Further, referring to fig. 1, the cart 100 further includes a folding button 3121, the folding button 3121 is configured to control the push rod 3 to switch from the locking state to the releasing state, that is, when the cart is folded, the folding button 3121 is manipulated to switch the push rod 3 from the locking state to the releasing state, so that the first four-bar linkage is movable, the upper push rod 31 is pushed upward, and the first four-bar linkage moves accordingly to switch the cart frame to the folding state.

Alternatively, referring to fig. 1, the rear end of the push rod 3 forms a handle portion 312, and a fold-away button 3121 is provided on the handle portion 312, thereby facilitating manipulation.

In one embodiment of the present invention, referring to fig. 1-4, the first linkage 7 includes a connecting rod 71 and a crank 72, a lower end of the connecting rod 71 is rotatably connected to the lower rear rod 22, a lower end of the crank 72 is rotatably connected to an upper end of the connecting rod 71, an upper end of the crank 72 is fixedly connected to the stay 5 to be driven by the stay 5 to rotate, and the stay 5 moves to switch the frame rear rod 2 between the extended state and the shortened state. Specifically, the connecting rod 71, the crank 72, the upper rear rod 21 and the lower rear rod 22 constitute a slider-crank mechanism, and when the stay 5 moves, the stay 5 drives the crank 72 to rotate, so as to drive the slider-crank mechanism to move, thereby switching the frame rear rod 2 between the extended state and the shortened state. The first linkage mechanism 7 is simple in structure and stable and reliable in driving process.

Advantageously, the crank 72 and the stay bar 5 are integrally formed, and the crank 72 is formed by bending and extending the front end of the stay bar 5, so that the production and assembly processes of the crank 72 and the stay bar 5 can be simplified, and the connection strength between the crank 72 and the stay bar 5 is high and is not easy to break.

Of course, the present invention is not limited thereto, and the crank 72 and the stay 5 may be separately formed and then the crank 72 and the stay 5 may be connected, for example, the crank 72 and the stay 5 may be connected by welding or bolting, thereby diversifying the manufacturing process of the crank 72 and the stay 5.

In an alternative embodiment of the present invention, referring to fig. 4-8, the cart 100 further includes a connecting member 20, the connecting member 20 is disposed at a front end of the lower rear rod 22 and detachably connected to the lower rear rod 22, and the lower rear rod 22 is rotatably connected to the connecting rod 71 through the connecting member 20. The connection between the lower rear rod 22 and the connecting rod 71 is more flexible and convenient by arranging the connecting piece 20.

Further, as shown in fig. 4 to 8, the upper rear rod 21 passes through the connection member 20 and is telescopically embedded in the lower rear rod 22, the connection member 20 includes a first connection section 201 and a second connection section 202 connected to each other, the first connection section 201 is exposed to the outside of the lower rear rod 22 and rotatably connected to the connection rod 71, and the second connection section 202 is embedded in the lower rear rod 22 and detachably connected to the lower rear rod 22. Thereby facilitating the connection between the link 20 and the link 71 and between the link 20 and the lower rear link 22.

In an alternative embodiment of the present invention, as shown in fig. 5-6 and 8, one of the lower rear rod 22 and the connecting member 20 is provided with an elastic buckle 2021, and the other of the lower rear rod 22 and the connecting member 20 is provided with a clamping position 222 (e.g., a clamping hole or a clamping groove) adapted to the elastic buckle 2021.

In the present embodiment, the following specific examples are included: the lower rear rod 22 is provided with an elastic buckle 2021, and the connecting piece 20 is provided with a clamping position 222 matched with the elastic buckle 2021. Or optionally, an elastic buckle 2021 is arranged on the connecting piece 20, and a clamping position 222 adapted to the elastic buckle 2021 is arranged on the lower rear rod 22. Through the cooperation between the elastic buckle 2021 and the clamping position 222, the connection between the lower rear rod 22 and the connecting piece 20 is realized, and the connecting structure is simple and is convenient to disassemble and assemble.

Advantageously, as shown in fig. 6 to 7, the end of the upper rear rod 21 embedded in the lower rear rod 22 is provided with a stop block 211, and the stop block 211 can abut against the end of the second connecting section 202 to limit the length of the upper rear rod 21 extending out of the lower rear rod 22, so that the upper rear rod 21 can be prevented from sliding out of the upper rear rod 21.

In one embodiment of the present invention, referring to fig. 1 to 4, the second linkage 8 includes a first link 81 and a second link 82, a front end of the first link 81 is rotatably connected to the frame front bar 1, a front end of the second link 82 is rotatably connected to a rear end of the first link 81, a rear end of the second link 82 is rotatably connected to the other ends of the upper rear bar 21 and the transmission bar 6, respectively, specifically, a rear end of the second link 82 is rotatably connected to the upper rear bar 21, while a rear end of the second link 82 is rotatably connected to the other end of the transmission bar 6, and a relative rotation axis between the transmission bar 6 and the second link 82 does not overlap with a relative rotation axis between the second link 82 and the upper rear bar 21. The first link 81, the second link 82, the upper rear bar 21 and the frame front bar 1 constitute a second four-link mechanism, which is linked with the first four-link mechanism through the transmission rod 6, and when the first four-link mechanism moves to bring the stroller frame into the unfolded state shown in fig. 1, the second four-link mechanism moves therewith to bring the front end of the frame front bar 1 away from the rear end of the frame rear bar 2, and when the first four-link mechanism moves to bring the stroller frame into the folded state shown in fig. 10-11, the second four-link mechanism moves therewith to bring the front end of the frame front bar 1 toward the rear end of the frame rear bar 2. The second linkage mechanism 8 has a simple structure and a stable and reliable driving process.

It will be appreciated that when the first four-bar linkage constitutes a triangular support structure, the relative positions of the second link 82 and the upper rear link 21 are locked, thereby allowing the second four-bar linkage to also constitute a triangular support structure, and thus the position of the frame front link 1 to be locked.

In one embodiment of the present invention, shown with reference to fig. 10-11, the front wheel assembly 9 has a transverse width less than the transverse width of the rear wheel assembly 10, with the front wheel assembly 9 being located between the rear wheel assembly 10 in the transverse direction when the stroller frame is in the collapsed condition. Specifically, referring to fig. 1, the frame front rod 1 and the frame rear rod 2 of the cart 100 are each provided in pair in the left-right direction, and correspondingly, the front wheel assembly 9 includes a left front wheel 91 and a right front wheel 92 which are oppositely provided in the left-right direction, 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, the rear wheel assembly 10 includes a left rear wheel 101 and a right rear wheel 102 which are oppositely provided in the left-right direction, 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.

Here, the "lateral direction" is a left-right direction shown in fig. 1. The front wheel assembly 9 has a lateral width defined by the distance between the left front wheel 91 and the right front wheel 92, the rear wheel assembly 10 has a lateral width defined by the distance between the left rear wheel 101 and the right rear wheel 102, the distance between the left front wheel 91 and the right front wheel 92 is smaller than the distance between the left rear wheel 101 and the right rear wheel 102, and the left front wheel 91 and the right front wheel 92 are located between the left rear wheel 101 and the right rear wheel 102 when the stroller frame is in the collapsed state. This may allow the cart 100 to be more compact when folded and have a smaller overall volume, thereby further facilitating carrying and storage of the cart 100.

In one embodiment of the present invention, the stroller 100 further comprises a seat bar 30, the seat bar 30 is rotatably connected to the lower push bar 32 and the stay 5, respectively, and the seat bar 30 has a switchable unfolded state (the seat bar 30 is in a substantially horizontal state as shown in fig. 1) and a folded state (the seat bar 30 is in a substantially vertical state as shown in fig. 10-11) with the unfolding and folding of the stroller frame. Specifically, the upper push rod 31, the stay 5, the seat bar 30, and the lower push rod 32 may constitute a third four-bar linkage mechanism, which shares the upper push rod 31, the stay 5, and the lower push rod 32 with the first four-bar linkage mechanism, whereby the third four-bar linkage mechanism is linked with the first four-bar linkage mechanism, and when the first four-bar linkage mechanism is moved so that the stroller frame is in the unfolded state as shown in fig. 1, the third four-bar linkage mechanism is moved so that the seat bar 30 is in the unfolded state as shown in fig. 1, and when the first four-bar linkage mechanism is moved so that the stroller frame is in the folded state as shown in fig. 10 to 11, the third four-bar linkage mechanism is moved so that the seat bar 30 is in the folded state as shown in fig. 1 to 11. Thereby enabling the seat post 30 to be unfolded and folded synchronously with the unfolding and folding of the cart frame, and the folding and unfolding operations of the cart 100 are convenient and simple.

It will be appreciated that when the first four-bar linkage constitutes a triangular support structure, the third four-bar linkage also constitutes a triangular support structure, thereby enabling the position of the seat post 30 to be locked.

In one embodiment of the present invention, the stroller 100 further comprises a grab rail 40, the grab rail 40 is rotatably connected with the lower push rod 32 and the support rod 5 respectively, and the grab rail 40 has switchable unfolded state (the grab rail 40 is in a substantially horizontal state as shown in fig. 1) and folded state (the grab rail 40 is in a substantially vertical state as shown in fig. 10-11) along with the unfolding and folding of the stroller frame. Specifically, the upper push rod 31, the support rod 5, the grab bar 40, and the lower push rod 32 may constitute a fourth four-bar linkage, which shares the upper push rod 31, the support rod 5, and the lower push rod 32, whereby the fourth four-bar linkage and the first four-bar linkage are linked, and when the first four-bar linkage is moved to place the stroller frame in the unfolded state as shown in fig. 1, the fourth four-bar linkage is moved to place the grab bar 40 in the unfolded state as shown in fig. 1, and when the first four-bar linkage is moved to place the stroller frame in the folded state as shown in fig. 10 to 11, the fourth four-bar linkage is moved to place the grab bar 40 in the folded state as shown in fig. 10 to 11. Thereby enabling the grab bar 40 to be unfolded and folded synchronously with the unfolding and folding of the cart frame, and the folding and unfolding operations of the cart 100 are convenient and simple.

It will be appreciated that when the first four-bar linkage constitutes the triangular support structure, the fourth four-bar linkage also constitutes the triangular support structure, thereby causing the position of the grab bar 40 to be locked.

In one embodiment of the present invention, referring to fig. 1 and fig. 10-11, the locking member 221 is disposed on the lower rear rod 22, and the locking member 311 is disposed on the upper push rod 31, so that the locking member 221 can cooperate with the locking member 311 to lock the stroller 100 in the folded state. This makes the structure of the cart 100 in the folded state more stable, and does not allow the cart 100 to be unfolded by pulling a certain part of the cart 100. When it is necessary to unfold the cart 100, the engagement between the lock piece 221 and the lock piece 311 may be released.

In an alternative embodiment of the present invention, the cart 100 further comprises a second extension rod (not shown), the second extension rod extends obliquely upward from front to back, a front end of the second extension rod is fixedly connected to the front end of the upper rear rod 21, a rear end of the second extension rod is rotatably connected to the front end of the lower push rod 32, and in the unfolded state, the second extension rod is substantially aligned with the lower push rod 32. The length of the push rod 3 can be reduced by providing the second extension rod, thereby further reducing the height of the cart 100 in the folded state.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or may comprise the first and second features being in contact, not directly, but via another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (8)

1. A linkage collapsed stroller, comprising:

the frame front rod extends upwards in an inclined mode from front to back;

the rear end of the front frame rod and the rear end of the lower rear rod are far away from each other to be unfolded at the first position, and the front end of the front frame rod and the rear end of the lower rear rod are close to each other to be stored at the second position;

the push rod comprises a lower push rod and an upper push rod, the upper push rod and the lower push rod both extend obliquely upwards from front to back, the front end of the lower push rod is rotatably connected with the front end of the upper rear rod, the rear end of the lower push rod is rotatably connected with the front end of the upper push rod, the push rod has a locking state and a releasing state, the lower push rod and the upper push rod cannot relatively rotate in the locking state, and the lower push rod and the upper push rod can relatively rotate in the releasing state;

the front end of the support rod is rotatably connected with the upper rear rod, and the rear end of the support rod is rotatably connected with the upper push rod;

the upper push rod, the support rod, the upper rear rod and the lower push rod form a first four-bar linkage mechanism, the trolley has an unfolding state and a storage state, when the push rod is in the releasing state, the first four-bar linkage mechanism can move to drive the trolley to be switched between the unfolding state and the storage state, when the trolley is stored, the rear end of the upper push rod and the front end of the lower push rod are close to each other to be folded, the rear end of the lower push rod and the rear end of the lower rear rod are close to each other to be folded, and when the push rod is in the locking state, the first four-bar linkage mechanism forms a triangular support structure to lock the trolley in the unfolding state or the storage state; and is

The first four-bar linkage is respectively linked with the front frame rod and the rear frame rod so as to drive the front frame rod to switch between the first position and the second position and drive the rear frame rod to switch between the extended state and the shortened state;

the lower end of the connecting rod is rotatably connected with the lower rear rod;

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 so as to be driven by the stay bar to rotate, and the connecting rod, the crank, the upper rear rod and the lower rear rod form a crank slider mechanism so as to drive the frame rear rod to be switched between the extension state and the contraction state when the stay bar moves;

the front end of the first connecting rod is rotationally connected with the frame front rod;

the front end of the second connecting rod is rotationally connected with the rear end of the first connecting rod, the rear end of the second connecting rod is rotationally connected with the upper rear rod, and the first connecting rod, the second connecting rod, the upper rear rod and the frame front rod form a second four-bar linkage;

one end of the transmission rod is rotatably connected with the lower push rod, the other end of the transmission rod is rotatably connected with the second connecting rod, a relative rotation axis between the transmission rod and the second connecting rod is not overlapped with a relative rotation axis between the second connecting rod and the upper rear rod, the first four-bar linkage mechanism drives the transmission rod to drive the second four-bar linkage mechanism to move when moving, so that the frame front rod is switched between the first position and the second position, when the first four-bar linkage mechanism forms a triangular support structure, the second four-bar linkage mechanism also forms a triangular support structure, and the frame front rod is locked at the first position or the second position.

2. The linked folding cart according to claim 1, further comprising a connecting member, wherein the connecting member is detachably connected to the lower rear rod, and the lower rear rod is rotatably connected to the connecting rod through the connecting member.

3. The linked folding cart according to claim 2, wherein the upper rear rod is telescopically embedded in the lower rear rod, the connecting member is sleeved on the outer peripheral wall of the upper rear rod, the connecting member includes a first connecting section and a second connecting section connected with each other, the first connecting section is exposed outside the lower rear rod and is rotatably connected with the connecting rod, and the second connecting section is embedded in the lower rear rod and is detachably connected with the lower rear rod.

4. The linked folding cart according to claim 3, wherein a stop block is provided at an end of the upper rear rod embedded in the lower rear rod, and the stop block can abut against an end of the second connecting section to limit the length of the upper rear rod extending out of the lower rear rod.

5. The linked folding cart according to claim 1, further comprising a first extension rod, wherein the first extension rod extends obliquely upward from front to back, the front end of the first extension rod is rotatably connected to the rear end of the frame front rod, the rear end of the first extension rod is fixedly connected to the front end of the upper rear rod, and in the unfolded state, the first extension rod and the frame front rod are substantially aligned.

6. The linked folding cart according to claim 1, further comprising a second extension rod, wherein the second extension rod extends obliquely upward from front to back, the front end of the second extension rod is fixedly connected to the front end of the upper rear rod, the rear end of the second extension rod is rotatably connected to the front end of the lower push rod, and in the unfolded state, the second extension rod and the lower push rod are substantially aligned.

7. The linked folding cart according to claim 1, further comprising a seat rod, wherein the seat rod has a horizontal state and a vertical state, the seat rod is rotatably connected to the lower push rod and the support rod, the upper push rod, the support rod, the seat rod and the lower push rod can form a third four-bar linkage mechanism, when the push rod is in the release state, the third four-bar linkage mechanism is movable to drive the seat rod to switch between the horizontal state and the vertical state, and when the push rod is in the lock state, the third four-bar linkage mechanism forms a triangular support structure to lock the seat rod in the horizontal state or the vertical state.

8. The linked folding cart according to claim 1, further comprising a handle bar, wherein the handle bar has a horizontal state and a vertical state, the handle bar is rotatably connected to the lower push rod and the support rod, the upper push rod, the support rod, the handle bar and the lower push rod can form a fourth four-bar linkage mechanism, when the push rod is in the release state, the fourth four-bar linkage mechanism is movable to drive the handle bar to switch between the horizontal state and the vertical state, and when the push rod is in the locking state, the fourth four-bar linkage mechanism forms a triangular support structure to lock the handle bar in the horizontal state or the vertical state.

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