CN215398867U - Folding bicycle with backrest linked and retracted - Google Patents

Abstract

The utility model discloses a folding vehicle with a backrest linked and folded, which comprises: the folding vehicle comprises a front wheel rod group, a rear wheel rod group, a surrounding frame rod group, a seat surface rod group and a backrest rod group, wherein the backrest linkage folding vehicle can automatically withdraw from the positioning concave position along with the folding and folding of the surrounding frame rod group and the rear wheel rod group for folding and folding in the folding and folding process of the folding vehicle, and does not need to be manually operated alone to withdraw from the positioning concave position, so that the use convenience is improved, and the practicability is high.

Description

Folding bicycle with backrest linked and retracted

Technical Field

The utility model relates to an infant article, in particular to a folding bicycle with a backrest linked and folded.

Background

The baby carriage is a handcart convenient for transporting babies and carrying children to go out, and the baby carriage on the market can be folded when not used, so the baby carriage is also called as a folding carriage. The folding vehicle mainly comprises a front wheel rod, a rear wheel rod, a surrounding frame rod and a seat surface rod, wherein the surrounding frame rod and the seat surface rod are mounted and supported on a seat surface of the folding vehicle together, a handrail is generally fixed with the surrounding frame rod, and the folding of the front wheel rod, the rear wheel rod and the seat surface rod can be automatically completed when the surrounding frame rod is controlled to be folded. The part folding car rotates on the seat pole and is provided with the back-up plate and supports the back-up, sets up bearing structure through enclosing hack lever or seat pole and supports the back-up plate, in traditional structure, when folding receipts are closed, need manually remove bearing structure to just can accomplish folding receipts smoothly to the supporting role of back-up plate, convenient, laborsaving inadequately.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the backrest of the folding vehicle provided by the utility model can be folded in a linkage manner in the folding and folding process of the folding vehicle without being independently unlocked manually, so that the convenience in use is improved.

According to the embodiment of the utility model, the folding vehicle with the backrest linked and folded comprises: the front wheel rod group, the rear wheel rod group, the surrounding frame rod group, the seat surface rod group and the backrest rod group; wherein,

the upper end of the front wheel rod group is rotatably connected with the upper section of the rear wheel rod group;

the lower end of the surrounding frame rod group is rotatably connected with the upper end of the rear wheel rod group, a second rotation adjusting mechanism is arranged between the surrounding frame rod group and the rear wheel rod group, the second rotation adjusting mechanism is used for locking when the surrounding frame rod group is completely unfolded relative to the rear wheel rod group, and a second unlocking part used for controlling the second rotation adjusting mechanism to unlock is arranged on the surrounding frame rod group;

the seat surface bar group is a multi-link mechanism, is arranged among the front wheel bar group, the rear wheel bar group and the enclosing frame bar group, and is used for linkage unfolding or folding when the rear wheel bar group and the enclosing frame bar group are unfolded or folded, and simultaneously drives the front wheel bar group to be unfolded or folded relative to the rear wheel bar group, and a positioning structure is arranged on the seat surface bar group;

the backrest rod group is rotatably arranged on the seat surface rod group, the angle of the backrest rod group is fixed through the action of the positioning structure when the surrounding frame rod group is completely unfolded relative to the rear wheel rod group, and the backrest rod group can be automatically separated from the positioning structure when the surrounding frame rod group and the rear wheel rod group are folded.

According to the embodiment of the utility model, at least the following technical effects are achieved:

according to the utility model adopting the structure, the second rotation adjusting mechanism is arranged between the enclosing frame rod group and the rear wheel rod group, when the enclosing frame rod group is controlled to be unfolded to a working state (namely, the enclosing frame rod group is completely unfolded) relative to the rear wheel rod group, the enclosing frame rod group can be locked through the second rotation adjusting mechanism, the seat surface rod group can be further linked to be unfolded and locked, meanwhile, the front wheel rod group is unfolded and locked through the locking of the seat surface rod group, and meanwhile, the backrest rod group is angularly fixed through the positioning structure, so that the front wheel rod group, the rear wheel rod group, the enclosing frame rod group, the seat surface rod group and the backrest rod group are stably kept in the working state. When the locking state of the second rotation adjusting mechanism is released through the second unlocking part to fold, the included angle between the surrounding frame rod group and the rear wheel rod group is reduced, the seat surface rod group is linked to fold the front wheel rod group and changes with the relative position relation of the back rest rod group, so that the back rest rod group can be automatically separated from the positioning structure, and the folding is completed. Therefore, in the folding vehicle with the backrest linkage folding function, the backrest rod group can be automatically separated from the positioning structure along with the folding and the folding of the surrounding frame rod group and the rear wheel rod group to be folded and folded in the folding and the folding processes of the backrest linkage folding vehicle, the backrest rod group does not need to be separated from the positioning structure through independent manual operation, the use convenience is improved, and the practicability is high.

According to some embodiments of the present invention, the seat surface bar group is provided with a seat surface support bar, a first connection bar, a second connection bar, a third connection bar, a fourth connection bar and a fifth connection bar, the upper end of the first connection bar is rotatably connected to the lower section position of the surrounding frame bar group, the lower end of the first connection bar is rotatably connected to the upper end of the second connection bar, the middle section position of the second connection bar is rotatably connected to the rear wheel bar group, the lower end of the second connection bar is rotatably connected to the connecting head, one end of the third connection bar is rotatably connected to the front wheel bar group, the other end of the third connection bar is rotatably connected to the fourth connection bar, one end of the fourth connection bar, which is far away from the third connection bar, is rotatably connected to the rear wheel bar group, the fourth connection bar is slidably inserted into the connecting head, the lower end of the fifth connection bar is rotatably connected to the upper section position of the rear wheel bar group, and one end of the seat surface support bar is rotatably connected to the first connection bar, The middle section position is rotatably connected with the upper end of the fifth connecting rod.

According to some embodiments of the present invention, the positioning structure includes a positioning concave portion recessed downward on the first connecting rod, the lower end of the backrest rod set is rotatably connected to a region between a connection portion of the seat surface support rod with the first connecting rod and a connection portion of the backrest rod set with the fifth connecting rod, the backrest rod set is provided with a backrest positioning rod corresponding to the positioning concave portion, the backrest positioning rod falls into the positioning concave portion when the enclosure rod set is completely unfolded with respect to the rear wheel rod set, and automatically exits from the positioning concave portion when the enclosure rod set is folded with respect to the rear wheel rod set.

According to the embodiment of the utility model, at least the following technical effects are achieved:

according to the utility model adopting the structure, the second rotation adjusting mechanism is arranged between the enclosing frame rod group and the rear wheel rod group, and the enclosing frame rod group can be locked through the second rotation adjusting mechanism when being controlled to be unfolded to a working state (namely, the enclosing frame rod group is completely unfolded) relative to the rear wheel rod group, so that the angles of the first connecting rod and the second connecting rod can be fixed, the seat surface supporting rod can be fixed at the same time, the angles of the third connecting rod and the fourth connecting rod can be fixed through the connecting head at the lower end of the second connecting rod, the angle between the front wheel rod group and the rear wheel rod group can be further fixed, and meanwhile, the backrest positioning rod of the backrest rod group falls into the positioning concave position to be angularly fixed, so that the front wheel rod group, the rear wheel rod group, the enclosing frame rod group, the seat surface rod group and the backrest rod group are stably kept in the working state. When the locking state of the second rotation adjusting mechanism is released through the second unlocking part to fold, the included angle between the surrounding frame rod group and the rear wheel rod group is reduced, the joint of the first connecting rod and the second connecting rod is driven to rotate and fold towards the direction far away from the fifth connecting rod, at the moment, the first connecting rod can drive the seat surface supporting rod to synchronously move, the front end of the seat surface supporting rod rotates upwards under the action of the fifth connecting rod, meanwhile, the upper end of the first connecting rod rotates downwards relative to the lower end of the first connecting rod, so that the backrest positioning rod can automatically exit from the positioning concave position, meanwhile, the lower end of the second connecting rod can rotate upwards when the first connecting rod and the second connecting rod rotate and fold, so that the joint of the fourth connecting rod and the third connecting rod can be driven to rotate upwards, thereby driving the front wheel rod set and the rear wheel rod set to be folded.

According to some embodiments of the present invention, the backrest positioning rod is movably and adjustably disposed on the backrest rod set toward the upper end of the backrest rod set, and a positioning spring is disposed between the backrest positioning rod and the backrest rod set, and the positioning spring is used for keeping the backrest positioning rod at the lowest end within the adjustment stroke range in a normal state.

According to some embodiments of the utility model, the first connecting rod is provided with a plurality of positioning concave positions, and the backrest positioning rod sets have different inclination angles relative to the vertical direction when falling into different positioning concave positions.

According to some embodiments of the utility model, the middle region of the backrest positioning bar has an upwardly arched structure.

According to some embodiments of the present invention, the backrest rod set is provided with a backrest plate, and the backrest plate is provided with a abdicating structure corresponding to the backrest positioning rod for the movement adjustment of the backrest positioning rod.

According to some embodiments of the utility model, a handle is provided at an upper end of the backrest plate and on a side of the front wheel bar set adjacent to the rear wheel bar set.

According to some embodiments of the utility model, the fifth connecting rod is a knee lever structure.

According to some embodiments of the present invention, the foldable vehicle with the backrest linked and folded further includes an armrest rod set, a lower end of the armrest rod set is rotatably connected to the rear wheel rod set, a first rotation adjusting mechanism is disposed between the armrest rod set and the rear wheel rod set, the first rotation adjusting mechanism has at least two locking states, in one locking state, the armrest rod set is located above the front wheel rod set relative to the rear wheel rod set, in the other locking state, the armrest rod set is located above the rear wheel rod set relative to the front wheel rod set, and a first unlocking portion for controlling the first rotation adjusting mechanism to unlock is disposed on the armrest rod set.

According to some embodiments of the present invention, the first rotation adjusting mechanism includes a first joint seat, a second joint seat, a first adjusting wheel, a first unlocking wheel, a first return spring and a first unlocking pull rope, the first joint seat is disposed at a lower end of the armrest lever set, the second joint seat is disposed at an upper end of the rear wheel lever set and located inside the first joint seat, the first joint seat and the second joint seat are pivotally connected together, one end of the first joint seat close to the second joint seat is provided with a first mounting cavity, the second joint seat is provided with a second mounting cavity corresponding to the first mounting cavity, the first adjusting wheel is coaxially and rotatably disposed in a cavity formed by the first mounting cavity and the second mounting cavity, and the first unlocking wheel is disposed in a cavity formed by the first mounting cavity and the second mounting cavity and located in a position where the first adjusting wheel is close to the first adjusting wheel One end of a joint seat, the first reset spring is arranged in a cavity formed by the first installation cavity and the second installation cavity and is positioned at one end of the first unlocking wheel, which is far away from the first adjusting wheel, a first guide structure is arranged between the first adjusting wheel and the first unlocking wheel, a first rotation limiting structure is arranged between the first unlocking wheel and the first installation cavity and between the first unlocking wheel and the second installation cavity, one end of the first unlocking pull rope is connected with the first adjusting wheel, the other end of the first unlocking pull rope extends onto the handrail bar group and is connected with the first unlocking part, the first unlocking wheel is simultaneously positioned in the first installation cavity and the second installation cavity under the action of the first reset spring and locks the first joint seat and the second joint seat through the first rotation limiting structure in a normal state, and the first adjusting wheel can rotate and pushes the first unlocking pull rope through the first guide structure And the first unlocking wheel is enabled to exit from the second mounting cavity along the axial direction of the first adjusting wheel under the action of the first rotation limiting structure.

According to some embodiments of the utility model, the first unlocking portion is slidably disposed on the armrest lever group for pulling the first adjustment wheel to rotate by sliding of the first unlocking portion.

According to some embodiments of the present invention, the second rotation adjusting mechanism includes a third joint seat, a second adjusting wheel, a second unlocking wheel, a second return spring and a second unlocking pull rope, the third joint seat is disposed at the lower end of the surrounding frame rod set, the third joint seat is rotatably pivoted to the inner side of the second joint seat, the inner side of the second joint seat is provided with a third mounting cavity, the third joint seat is provided with a fourth mounting cavity corresponding to the third mounting cavity, the second adjusting wheel and the second joint seat and the third joint seat are coaxially and rotatably disposed in a cavity formed by the third mounting cavity and the fourth mounting cavity, a second guiding structure is disposed between the second adjusting wheel and the third joint seat, the second unlocking wheel is disposed in a cavity formed by the third mounting cavity and the fourth mounting cavity and is located at an end of the second adjusting wheel far from the third joint seat, a second rotation limiting structure is arranged between the second unlocking wheel and the third mounting cavity and between the second unlocking wheel and the fourth mounting cavity, the second reset spring is arranged in a cavity formed by the third mounting cavity and the fourth mounting cavity and is positioned at one end of the second unlocking wheel far away from the second adjusting wheel, one end of the second unlocking pull rope is connected with the second adjusting wheel, the other end of the second unlocking pull rope is connected with the second unlocking part, the second unlocking wheel is simultaneously positioned in the third mounting cavity and the fourth mounting cavity under the action of the second reset spring and locks the second joint seat and the third joint seat through the second rotation limiting structure in a normal state, the second adjusting wheel can push the second unlocking wheel through the second guide structure when being dragged to rotate by the second unlocking pull rope, so that the second unlocking wheel exits from the fourth mounting cavity under the action of the second rotation limiting structure.

According to some embodiments of the utility model, the second unlocking part is slidably disposed on the rail bar group for pulling the second adjusting wheel to rotate by sliding of the second unlocking part.

Additional aspects and advantages of the utility model 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 utility model.

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 view of the overall structure of the present invention in a deployed state;

FIG. 2 is a schematic view of one position of the pole sets in the deployed condition of the present invention;

FIG. 3 is a schematic view of a state where the positioning rod of the backrest exits the positioning recess;

FIG. 4 is a schematic view of one configuration of the first and second rotary adjustment mechanisms;

FIG. 5 is a schematic view of an installed position of the first release liner and the second release liner;

fig. 6 is a schematic view of one position arrangement of the first unlocking core and the second unlocking core;

fig. 7 is a schematic view of a structure of the fourth rotation adjusting mechanism.

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.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

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; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 7, the present invention is a foldable vehicle with a backrest foldable in a linked manner, including: a front wheel bar group 200, a rear wheel bar group 100, a surrounding frame bar group 400, a seat surface bar group and a back rest bar group 500; wherein,

the upper end of the front wheel rod group 200 is rotatably connected with the upper section of the rear wheel rod group 100;

the lower end of the surrounding frame rod group 400 is rotatably connected with the upper end of the rear wheel rod group 100, a second rotation adjusting mechanism is arranged between the surrounding frame rod group 400 and the rear wheel rod group 100, the second rotation adjusting mechanism is used for locking when the surrounding frame rod group 400 is completely unfolded relative to the rear wheel rod group 100, and a second unlocking part used for controlling the second rotation adjusting mechanism to unlock is arranged on the surrounding frame rod group 400;

the seat cushion bar group is a multi-link mechanism and is arranged among the front wheel bar group 200, the rear wheel bar group 100 and the frame enclosing bar group 400, and is used for linkage unfolding or folding when the rear wheel bar group 100 and the frame enclosing bar group 400 are unfolded or folded, and simultaneously drives the front wheel bar group 200 to be unfolded or folded relative to the rear wheel bar group 100, and a positioning structure is arranged on the seat cushion bar group;

the backrest rod set 500 is rotatably installed on the seat surface rod set, and is fixed in angle through the positioning structure when the enclosure rod set 400 is completely unfolded relative to the rear wheel rod set 100, and the backrest rod set 500 can be automatically separated from the positioning structure when the enclosure rod set 400 and the rear wheel rod set 100 are folded.

In the utility model adopting the above structure arrangement, since the second rotation adjusting mechanism is arranged between the frame enclosing rod set 400 and the rear wheel rod set 100, when the frame enclosing rod set 400 is controlled to be unfolded to a working state (i.e. the fully unfolded state) relative to the rear wheel rod set 100, the frame enclosing rod set 400 can be locked by the second rotation adjusting mechanism, and further can be linked with the unfolding and locking of the seat surface rod set, meanwhile, the unfolding and locking of the front wheel rod set 200 are realized by the locking of the seat surface rod set, and meanwhile, the back rest rod set 500 is angularly fixed by the positioning structure, so that the front wheel rod set 200, the rear wheel rod set 100, the frame enclosing rod set 400, the seat surface rod set and the back rest rod set 500 are stably kept in the working state. When the second unlocking part releases the locking state of the second rotation adjusting mechanism for folding, the included angle between the surrounding frame rod set 400 and the rear wheel rod set 100 is reduced, the linked seat surface rod set is folded, the seat surface rod set is linked with the front wheel rod set 200 for folding, and the relative position relation between the seat surface rod set and the back rod set 500 is changed, so that the back rod set 500 can be automatically separated from the positioning structure, and the folding is completed. Therefore, in the folding process of the folding vehicle with the backrest linked for folding, the backrest rod set 500 can be automatically separated from the positioning structure along with the folding of the surrounding frame rod set 400 and the rear wheel rod set 100 for folding and folding, and the backrest rod set does not need to be separated from the positioning structure by independent manual operation, thereby being beneficial to improving the use convenience and having strong practicability.

In some embodiments of the present invention, the seat cushion bar set is provided with a seat cushion support bar 509, a first connecting bar 503, a second connecting bar 504, a third connecting bar 505, a fourth connecting bar 507 and a fifth connecting bar 508, the upper end of the first connecting bar 503 is rotatably connected to the lower section of the frame enclosing bar set 400, the lower end of the first connecting bar is rotatably connected to the upper end of the second connecting bar 504, the middle section of the second connecting bar 504 is rotatably connected to the rear wheel bar set 100, the lower end of the second connecting bar 504 is rotatably connected to the connecting head 506, one end of the third connecting bar 505 is rotatably connected to the front wheel bar set 200, the other end of the third connecting bar 505 is rotatably connected to the fourth connecting bar 507, one end of the fourth connecting bar 507 far from the third connecting bar 505 is rotatably connected to the rear wheel bar set 100, and the fourth connecting rod 507 is slidably disposed on the connecting head 506, the lower end of the fifth connecting rod 508 is rotatably connected to the upper end of the rear wheel set 100, one end of the seat surface supporting rod 509 is rotatably connected to the first connecting rod 503, and the middle end of the seat surface supporting rod 509 is rotatably connected to the upper end of the fifth connecting rod 508.

In some embodiments of the present invention, the positioning structure includes a positioning concave 510 recessed downward on the first connecting rod 503, the lower end of the back rod set 500 is rotatably connected to a region between a connection point of the seat support rod 509 and the first connecting rod 503 and a connection point of the back rod set 500 and the fifth connecting rod 508, the back rod set 500 is provided with a back positioning rod 501 corresponding to the positioning concave 510, the back positioning rod 501 falls into the positioning concave 510 when the frame surrounding rod set 400 is completely unfolded with respect to the rear wheel rod set 100, and automatically exits the positioning concave 510 when the frame surrounding rod set 400 is folded with respect to the rear wheel rod set 100.

In the utility model adopting the above structure, since the second rotation adjusting mechanism is arranged between the frame enclosing rod set 400 and the rear wheel rod set 100, the control frame bar set 400 can be locked by the second rotation adjusting mechanism when being unfolded to the working state (i.e. the above-mentioned fully unfolded) relative to the rear wheel bar set 100, therefore, the angles of the first connecting rod 503 and the second connecting rod 504 are fixed, and at the same time, the seat support rod 509 can be fixed, and the angles of the third connecting rod 505 and the fourth connecting rod 507 can be fixed by the connection head 506 of the lower end of the second connecting rod 504, thereby fixing the angle between the front wheel bar set 200 and the rear wheel bar set 100, and simultaneously the backrest positioning bar 501 of the backrest bar set 500 falls into the positioning concave 510 for angle fixing, so that the front wheel bar set 200, the rear wheel bar set 100, the frame bar set 400, the seat face bar set, and the back bar set 500 are stably maintained in the working state. When the locking state of the second rotation adjusting mechanism is released by the second unlocking portion to fold and unfold, the included angle between the frame surrounding rod set 400 and the rear wheel rod set 100 is reduced, and the joint of the first connecting rod 503 and the second connecting rod 504 is driven to rotate and fold in the direction away from the fifth connecting rod 508, at this time, the first connecting rod 503 drives the seat surface supporting rod 509 to move synchronously, so that the front end of the seat surface supporting rod 509 rotates upwards under the action of the fifth connecting rod 508, and simultaneously, because the upper end of the first connecting rod 503 rotates downwards relative to the lower end thereof, in combination with the rotation of the seat surface supporting rod 509, the backrest positioning rod 501 automatically exits from the positioning concave 510, so that the upper end of the backrest rod set 500 can rotate downwards around the lower end to fold and fold, meanwhile, because the connecting head 506 of the lower end of the second connecting rod 504 is slidably sleeved on the fourth connecting rod 507, when the first connecting rod 503 and the second connecting rod 504 are rotated and folded, the lower end of the second connecting rod 504 rotates upward, so that the connecting portion of the fourth connecting rod 507 and the third connecting rod 505 can be driven to rotate upward, and further the front wheel bar set 200 and the rear wheel bar set 100 can be driven to fold. Therefore, in the folding process of the folding vehicle with the backrest linked for folding, the backrest rod set 500 can automatically withdraw from the positioning concave 510 along with the folding of the surrounding frame rod set 400 and the rear wheel rod set 100 for folding, and the backrest rod set does not need to be manually operated alone to withdraw from the positioning concave 510, which is beneficial to improving the use convenience and has strong practicability.

In actual use, the backrest rod set 500 is used for mounting a backrest structure, the seat surface rod set is used for mounting a seat surface structure, and a shed structure is mounted between the surrounding frame rod set 400 and the backrest rod set 500. The backrest positioning rod 501 can be manually controlled when entering the positioning concave 510 in the working state, or a connecting structure can be arranged between the backrest rod set 500 and other rod sets of the folding vehicle folded in the backrest linkage manner, so that the folding vehicle folded in the backrest linkage manner drives the backrest rod set 500 to upwards rotate to correspond to the positioning concave 510 in the unfolding process, and the backrest rod set automatically falls into the positioning concave 510 when being completely unfolded, and the connecting structure can be realized through a shed structure, or can be connected through structures such as an elastic rope to realize linkage, which is not listed one by one.

Considering that if the backrest positioning rod 501 is fixedly disposed on the backrest rod set 500, it is necessary to ensure that the backrest rod set 500 corresponds to the positioning concave 510 when the backrest positioning rod is unfolded to the working state, otherwise, the backrest positioning rod 501 cannot fall into the positioning concave 510 after the backrest positioning rod is unfolded to the working state. Can increase the operation degree of difficulty when adopting manual control's mode, be not conform to the convenience design requirement, and when backing rod group 500 through setting up connection structure and coming the linkage, higher to connection structure's the design degree of difficulty, can improve manufacturing cost. In view of this, in some embodiments of the present invention, the backrest positioning rod 501 is movably and adjustably disposed on the backrest rod set 500 toward the upper end of the backrest rod set 500, and a positioning spring 511 is disposed between the backrest positioning rod 501 and the backrest rod set 500, and the positioning spring 511 is used to keep the backrest positioning rod 501 at the lowest end of the adjustment stroke range in the normal state.

Adopt the structure setting of above-mentioned embodiment, no matter back to the form that rod group 500 adopted manual control or adopt the form of linkage, because back locating lever 501 can move the regulation, consequently finally all can successfully fall into location concave position 510 in, the condition that the structure interferes and leads to unable location concave position 510 that falls into can not appear. The specific mounting structure of the backrest positioning lever 501 is not specifically limited, and may be flexibly set as needed in actual installation.

In some embodiments of the present invention, the first connecting rod 503 is provided with a plurality of stages of slots, the plurality of stages of slots are provided with a plurality of positioning recesses 510, and the backrest positioning rods 501 have different inclination angles with respect to the vertical direction when falling into different positioning recesses 510. The structure of this embodiment is adopted to set up, can adjust the inclination of backing the pole group 500 through multistage draw-in groove, and then change the angle of back structure to this satisfies user's different user demands. When the backrest positioning rod 501 is adjusted, the backrest positioning rod 501 only needs to be lifted upwards to be out of the original positioning concave position 510, then the backrest positioning rod 501 is rotated to the target positioning concave position 510, the backrest positioning rod 501 is loosened, and the backrest positioning rod 501 can automatically fall into the target positioning concave position 510 under the action of the positioning spring 511.

In some embodiments of the utility model, the middle region of the back positioning bar 501 has an upwardly arched configuration. Since the height of the foldable cart folded by linking the backrest is inevitably lower than the height of the user, the user needs to bend down when operating the backrest positioning lever 501. This embodiment forms handle 502 through the structure that sets up the arch up in the middle zone at back locating lever 501, can avoid the user to bow or reduce user's the degree of bowing, is favorable to improving the simple operation nature. The upwardly arched structure may be formed directly on the backrest positioning rod 501 as shown in fig. 1, or may be formed by mounting or welding a similar structure on the backrest positioning rod 501.

In some embodiments of the present invention, the backrest rod set 500 is provided with a backrest plate 512, and the backrest plate 512 is provided with a yielding structure corresponding to the backrest positioning rod 501 for the backrest positioning rod 501 to move and adjust. In actual operation, the backrest panel 512 is used to carry a backrest structure.

In some embodiments of the present invention, a handle 513 is disposed at an upper end of the backrest panel 512 and on a side of the front wheel bar set 200 adjacent to the rear wheel bar set 100. The handle 513 may be provided to provide a point of application for the user when rotating the backrest panel 512, or to provide a point of application for the user to carry after folding.

Referring to fig. 2 and 3, in some embodiments of the present invention, the fifth connecting rod 508 is a bent rod structure. The curved bar structure shown in fig. 2 is advantageous in ensuring the supporting strength of the fifth connecting bar 508 to the seat support bar 509, and at the same time, helps to improve the smoothness of the seat bar set during the folding and unfolding processes.

Considering the conventional foldable vehicle, the armrests are fixed to the frame rail set 400, so that the user can push forward only when using the foldable vehicle, and the situation that the user wants to push backward or the child in the foldable vehicle faces himself on a certain occasion cannot be satisfied. In view of this, in some embodiments of the present invention, the foldable vehicle with linked folding backrest further includes an armrest rod set 300, a lower end of the armrest rod set 300 is rotatably connected to the rear wheel rod set 100, a first rotation adjusting mechanism is disposed between the armrest rod set 300 and the rear wheel rod set 100, the first rotation adjusting mechanism has at least two locking states, one locking state is that the armrest rod set 300 is located above the front wheel rod set 200 relative to the rear wheel rod set 100, and the other locking state is that the armrest rod set 300 is located above the rear wheel rod set 100 relative to the front wheel rod set 200, and the armrest rod set 300 is provided with a first unlocking portion for controlling the first rotation adjusting mechanism to unlock.

By adopting the structure arrangement in the embodiment, the armrest rod set 300 can be fixed above the rear wheel rod set 100 or above the front wheel rod set 200 under the action of the first rotation adjusting mechanism, when the foldable vehicle is normally pushed, the armrest rod set 300 only needs to be controlled to be located above the rear wheel rod set 100 relative to the front wheel rod set 200, and when the space is not enough to complete the turning operation of the foldable vehicle and the foldable vehicle needs to be pushed reversely, or when a child in the foldable vehicle needs to push the foldable vehicle towards himself, the locking state of the first rotation adjusting mechanism only needs to be released through the first unlocking part, the armrest rod set 300 is rotated to be located above the front wheel rod set 200 relative to the rear wheel rod set 100 to be locked, so that the use requirement can be achieved, and the practicability is strong.

Other rod set structures in the utility model can be set according to the related prior art, and only the realization and installation of the functions can be realized.

Referring to fig. 1 and 2, in some embodiments of the present invention, an end of the seat support bar 509, which is away from the first connection bar 503, is provided with an adjustment bar 514, and a third rotation adjustment mechanism is provided between the adjustment bar 514 and the seat support bar 509, and is configured to limit the downward rotation of the adjustment bar 514 when the adjustment bar 514 rotates upward to a set angle, so as to ensure the load-bearing performance of the adjustment bar 514. The adjustment rod 514 may be used to assist in the installation of the sleep basket, or may be used to provide other structural attachments that improve the comfort and safety of the ride. The third rotation adjusting mechanism may adopt a corresponding structure in the prior art, and will not be described herein too much.

Referring to fig. 4, in some embodiments of the present invention, the first rotation adjusting mechanism includes a first joint seat 301, a second joint seat 101, a first adjusting wheel 304, a first unlocking wheel 303, a first return spring 302 and a first unlocking pull rope 307, the first joint seat 301 is disposed at a lower end of the armrest lever set 300, the second joint seat 101 is disposed at an upper end of the rear wheel lever set 100 and is located inside the first joint seat 301, the first joint seat 301 and the second joint seat 101 are pivotally connected together, a first mounting cavity is disposed at an end of the first joint seat 301 close to the second joint seat 101, a second mounting cavity is disposed at the second joint seat 101 corresponding to the first mounting cavity, the first adjusting wheel 304 is coaxially and rotatably disposed in a cavity formed by the first mounting cavity and the second mounting cavity with the first joint seat 301 and the second joint seat 101, the first unlocking wheel 303 is disposed in a cavity formed by the first mounting cavity and the second mounting cavity and is located at an end of the first adjusting wheel 304 close to the first joint seat 301, first reset spring 302 sets up in the cavity that first installation cavity and second installation cavity formed and is located the one end that first unlocking wheel 303 deviates from first regulating wheel 304, be provided with first guide structure between first regulating wheel 304 and the first unlocking wheel 303, first unlocking wheel 303 and first installation cavity, be provided with first rotation limit structure between the second installation cavity, first regulating wheel 304 is connected to first unblock stay cord 307 one end, the other end extends on handrail group 300 and is connected first unlocking portion. Under the normal state, the first unlocking wheel 303 is located in the first installation cavity and the second installation cavity simultaneously under the action of the first return spring 302, the first joint seat 301 and the second joint seat 101 are locked through the first rotation limiting structure, the first adjusting wheel 304 can rotate when being pulled by the first unlocking pull rope 307, and the first unlocking wheel 303 is pushed through the first guide structure, so that the first unlocking wheel 303 exits from the second installation cavity along the axial direction of the first adjusting wheel 304 under the action of the first rotation limiting structure.

Since the armrest lever set 300 needs to be switched between a forward pushing state and a backward pushing state, a corresponding specific structure needs to be set corresponding to a rotation switching angle of the armrest lever set 300, so that when the armrest lever set 300 is rotated to be located above the rear wheel lever set 100 and to be in the forward pushing state and when the armrest lever set 300 is rotated to be located above the front wheel lever set 200 and to be in the backward pushing state, the first guide structure does not function, so that the first unlocking wheel 303 can lock the first joint seat 301 and the second joint seat 101.

Referring to fig. 4 to 6, since the first joint seat 301 is connected to the armrest lever set 300, and the first unlocking pulling rope 307 passes through the armrest lever set 300 and is connected to the first adjusting wheel 304, in order to facilitate connection between the first unlocking pulling rope 307 and the first adjusting wheel 304, an arc-shaped groove 306 is formed in the first unlocking wheel 303, a connecting column 305 penetrating through the arc-shaped groove 306 is disposed at one end of the first adjusting wheel 304 close to the first unlocking wheel 303, the first unlocking pulling rope 307 is connected to the connecting column 305, a distance is reserved between the connecting point of the first unlocking pulling rope 307 and the connecting column 305 and the first unlocking wheel 303, and the distance is adapted to a moving distance when the first unlocking wheel 303 moves out of the second installation cavity, so as to avoid interference between the first unlocking wheel 303 and the first unlocking pulling rope 307. While the range of rotation of the first adjustment wheel 304 may also be limited by the cooperation of the arcuate slot 306 and the attachment post 305.

In some embodiments of the present invention, a first unlocking portion is slidably disposed on the armrest lever assembly 300 for drawing the first adjustment wheel 304 to rotate by the sliding of the first unlocking portion.

Referring to fig. 5 and 6, the first unlocking portion includes a first unlocking core 309 slidably disposed inside the armrest lever set 300 and a first unlocking bushing 308 sleeved on the armrest lever set 300, the first unlocking core 309 is provided with a pin structure or a bolt structure penetrating through the armrest lever set 300 and connecting the first unlocking bushing 308, a first unlocking return spring is disposed in the armrest lever set 300 corresponding to the first unlocking core 309, and the first unlocking pull rope 307 is connected to the first unlocking core 309.

When the first unlocking bush 308 is pulled upwards, the first unlocking core 309 can be controlled to slide upwards, so that the first unlocking pull rope 307 is pulled to control the first rotation adjusting mechanism to unlock, and the first joint seat 301 and the second joint seat 101 can rotate freely relatively. After being released, the first unlocking core 309 is reset under the action of the first unlocking return spring, and simultaneously drives the first unlocking bushing 308 to reset, and the first adjusting wheel 304 and the first unlocking wheel 303 in the first rotation adjusting mechanism are reset under the action of the first return spring 302 and the first guiding structure, so that the locking of the first joint seat 301 and the second joint seat 101 can be completed again.

As described above, since the armrest lever assembly 300 needs to be switched between the forward pushing state and the backward pushing state, when the armrest lever assembly 300 is switched to the forward pushing state or the backward pushing state, the first guiding structure needs to be kept inactive, and the first rotation limiting structure is sufficient for the first unlocking wheel 303 after rotation to smoothly enter the second installation cavity again. On the basis of the action principle, the actual structures of the first guide structure and the first rotation limiting structure can be flexibly arranged, and are not particularly limited.

Referring to fig. 4, in some embodiments of the present invention, the second rotation adjustment mechanism includes a third joint seat 401, a second adjustment wheel 402, a second unlocking wheel 403, a second return spring 404 and a second unlocking pull rope 405, the third joint seat 401 is disposed at a lower end of the surrounding frame rod set 400, the third joint seat 401 is pivotally connected to an inner side of the second joint seat 101, an inner side of the second joint seat 101 is provided with a third mounting cavity, the third joint seat 401 is provided with a fourth mounting cavity corresponding to the third mounting cavity, the second adjustment wheel 402 is coaxially and rotatably disposed in a cavity formed by the third mounting cavity and the fourth mounting cavity with the second joint seat 101 and the third joint seat 401, a second guiding structure is disposed between the second adjustment wheel 402 and the third joint seat 401, the second unlocking wheel 403 is disposed in a cavity formed by the third mounting cavity and the fourth mounting cavity and is located at an end of the second adjustment wheel 402 far from the third joint seat 401, a second rotation limiting structure is arranged between the second unlocking wheel 403 and the third mounting cavity and the fourth mounting cavity, a second reset spring 404 is arranged in a cavity formed by the third mounting cavity and the fourth mounting cavity and is positioned at one end, far away from the second adjusting wheel 402, of the second unlocking wheel 403, one end of a second unlocking pull rope 405 is connected with the second adjusting wheel 402, the other end of the second unlocking pull rope is connected with the second unlocking part, in a normal state, the second unlocking wheel 403 is simultaneously positioned in the third mounting cavity and the fourth mounting cavity under the action of the second reset spring 404 and locks the second joint seat 101 and the third joint seat 401 through the second rotation limiting structure, and the second unlocking wheel 403 can push the second unlocking wheel 403 through a second guide structure when being pulled and rotated by the second unlocking pull rope 405, so that the second unlocking wheel 403 exits the fourth mounting cavity under the action of the second rotation limiting structure.

In this embodiment, since the second adjusting wheel 402 is located in the fourth installation cavity and the second unlocking portion is disposed on the frame enclosing bar set 400, the second unlocking rope 405 can be directly connected to the second adjusting wheel 402 without providing the connecting column 305 and the like included in the first rotation adjusting mechanism in the foregoing embodiment.

In some embodiments of the present invention, a second unlocking portion is slidably disposed on the frame bar set 400 for drawing the second adjusting wheel 402 to rotate by the sliding of the second unlocking portion.

Referring to fig. 5 and 6, the second unlocking portion includes a second unlocking core 407 slidably disposed in the surrounding rod group 400 and a second unlocking bushing 406 sleeved on the surrounding rod group 400, the second unlocking core 407 is provided with a pin structure or a bolt structure passing through the surrounding rod group 400 and connected to the second unlocking bushing 406, a second unlocking return spring is disposed in the surrounding rod group 400 corresponding to the second unlocking core 407, and the second unlocking pull rope 405 is connected to the second unlocking core 407.

When the second unlocking bushing 406 is slid in a direction away from the third joint seat 401, the second unlocking core 407 is driven to pull the second unlocking cord 405, so as to control the second rotation adjustment mechanism to unlock, and the second joint seat 101 and the third joint seat 401 can rotate relatively. After the second unlocking bush 406 is released, the second unlocking core 407 and the second unlocking bush 406 are reset by the second unlocking return spring, and the second unlocking wheel 403 and the second adjusting wheel 402 are reset by the second return spring 404 and the second guide structure, so that the second joint seat 101 and the third joint seat 401 can be locked again.

In some embodiments of the present invention, the frame enclosing bar set 400 is located above the rear wheel bar set 100 relative to the front wheel bar set 200, a first separation preventing structure is disposed between the frame enclosing bar set 400 and the first unlocking portion, and the first separation preventing structure can limit the sliding of the first unlocking portion when the armrest bar set 300 rotates to the set position. This can improve the stability in the partial position state.

Referring to fig. 1, 2 and 5, the position of the surrounding frame rod set 400 is set such that when the armrest rod set 300 rotates to be engaged with the first anti-disengaging structure, the armrest rod set is in a forward-pushing position state, which is a normal state of the stroller, and at this time, the first anti-disengaging structure limits the sliding of the first unlocking part, so as to play a role of safety. Specifically, the first anti-separation structure includes a limit pin disposed outside the surrounding rod set 400 and a U-shaped notch disposed inside the first unlocking bushing 308. When the armrest lever assembly 300 is rotated to a position aligned with the position of the stop pin on the surrounding lever assembly 400, the first unlocking bushing 308 can control the stop pin to move in and out of the U-shaped notch during the sliding process. Obviously, this state is also a locked position state of the first rotation adjustment mechanism. When the user needs to switch to push backwards or fold, the first unlocking bushing 308 needs to be pulled upwards to separate the limiting pin, so that the safety is higher. Moreover, the first anti-dropping structure can also be used for realizing the relative fixation of the related rod groups when the rod groups are folded.

In some embodiments of the present invention, the handle 600 is rotatably disposed at the upper end of the armrest rod set 300 through the fourth rotation adjusting mechanism, the handle 600 is provided with a third unlocking portion for controlling the fourth rotation adjusting mechanism to unlock, and the fourth rotation adjusting mechanism is slidably disposed at a lower section of the armrest rod set 300 with a link 608, the link 608 can slide during rotation of the handle 600, the second unlocking portion is provided with a second anti-falling structure corresponding to the link 608, the second anti-falling structure can be separated from the link 608 during sliding of the second unlocking portion, and the armrest rod set 300 can limit the link 608 from sliding through the second anti-falling structure when rotating to a set position, so as to lock the unlocking action of the third unlocking portion.

The handle 600 of this embodiment can be further reduced in size when folded. And can further improve structural stability through the setting of second anti-disengaging structure, have the insurance effect to third unblock portion.

Referring to fig. 7, in some embodiments of the present invention, the fourth rotation adjustment mechanism includes a fourth joint base 601, a fifth joint base 607, a third adjustment wheel 602, a third unlocking wheel 604, a third return spring, a third unlocking rope 603, a linkage wheel 606 and a linkage rope 605, wherein the fourth joint seat 601 is arranged at the lower end of the handle 600, the fifth joint seat 607 is arranged at the upper end of the armrest rod set 300 and is pivoted with the fourth joint seat 601, one end of the fourth joint seat 601 close to the fifth joint seat 607 is provided with a fifth installation cavity, the fifth joint seat 607 is provided with a sixth installation cavity corresponding to the fifth installation cavity, the third regulating wheel 602, the fourth joint seat 601 and the fifth joint seat 607 are coaxially and rotatably arranged in a cavity formed by the fifth installation cavity and the sixth installation cavity, and a third guiding structure is arranged between the third adjusting wheel 602 and the fourth joint seat 601, for controlling the axial movement of the third adjustment wheel 602 as the third adjustment wheel 602 rotates. The third unlocking wheel 604 is arranged in a cavity formed by the fifth mounting cavity and the sixth mounting cavity and is positioned at one end, close to the fifth joint seat 607, of the third adjusting wheel 602, the linkage wheel 606 is arranged in a cavity formed by the fifth mounting cavity and the sixth mounting cavity and is positioned at one end, close to the fifth joint seat 607, of the third unlocking wheel 604, the third reset spring abuts between the third unlocking wheel 604 and the linkage wheel 606, two ends of the third reset spring are fixed relative to the third unlocking wheel 604 and the linkage wheel 606, and the other end of the linkage wheel 606 abuts against the bottom of the sixth mounting cavity. And a third rotation limiting structure is arranged between the third unlocking wheel 604 and the fifth mounting cavity and between the third unlocking wheel and the sixth mounting cavity. A mandrel passing through the third adjusting wheel 602, the third unlocking wheel 604 and the linkage wheel 606 is arranged on the fourth joint seat 601 along the rotation shaft thereof, and a fourth rotation limiting structure is arranged between the mandrel and the linkage wheel 606. One end of a third unlocking pull rope 603 is connected with the third adjusting wheel 602, the other end of the third unlocking pull rope is connected with the third unlocking part, one end of a linkage pull rope 605 is connected with a linkage wheel 606, and the other end of the linkage pull rope is connected with a linkage piece 608.

Under normal conditions, the third unlocking wheel 604 is located in the fifth and sixth installation cavities simultaneously under the action of the third return spring to lock the angular positions of the fourth and fifth joint seats 601, 607.

When the third unlocking part is controlled to pull the third unlocking pulling rope 603, the third unlocking pulling rope 603 drives the third adjusting wheel 602 to rotate and push the third unlocking wheel 604 to exit the fifth installation cavity, so that the fourth joint seat 601 and the fifth joint seat 607 can rotate relatively, and when the fourth joint seat 601 rotates, the fourth joint seat 601 synchronously drives the linkage wheel 606 to rotate through the mandrel, and then the linkage pulling rope 605 is pulled to pull the linkage piece 608 to slide. Because the two ends of the third return spring are respectively and fixedly connected with the linkage wheel 606 and the third unlocking wheel 604, and the third unlocking wheel 604 cannot rotate under the action of the third rotation limiting structure, the third return spring can reset the linkage wheel 606. When the third unlocking part is released, the third unlocking wheel 604 reenters the fifth mounting cavity under the action of the third return spring, and the linkage wheel 606 rotates and returns under the action of the third return spring. In this process, the third unlocking part can also be reset by the third return spring, and the linkage 608 can be provided with a corresponding reset structure.

In the above embodiment, the second anti-disengaging structure is arranged to limit the sliding of the linkage 608, so as to lock the fourth rotation adjusting mechanism, thereby preventing the rotation of the handle 600 caused by the user mistakenly touching the third unlocking part, and having stronger structural stability and higher safety.

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 utility model. 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 utility model 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 utility model, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. The utility model provides a folding car that back linkage was closed which characterized in that includes: the front wheel rod group, the rear wheel rod group, the surrounding frame rod group, the seat surface rod group and the backrest rod group; wherein,

the upper end of the front wheel rod group is rotatably connected with the upper section of the rear wheel rod group;

the lower end of the surrounding frame rod group is rotatably connected with the upper end of the rear wheel rod group, a second rotation adjusting mechanism is arranged between the surrounding frame rod group and the rear wheel rod group, the second rotation adjusting mechanism is used for locking when the surrounding frame rod group is completely unfolded relative to the rear wheel rod group, and a second unlocking part used for controlling the second rotation adjusting mechanism to unlock is arranged on the surrounding frame rod group;

the seat surface bar group is a multi-link mechanism, is arranged among the front wheel bar group, the rear wheel bar group and the enclosing frame bar group, and is used for linkage unfolding or folding when the rear wheel bar group and the enclosing frame bar group are unfolded or folded, and simultaneously drives the front wheel bar group to be unfolded or folded relative to the rear wheel bar group, and a positioning structure is arranged on the seat surface bar group;

the backrest rod group is rotatably arranged on the seat surface rod group, the angle of the backrest rod group is fixed through the action of the positioning structure when the surrounding frame rod group is completely unfolded relative to the rear wheel rod group, and the backrest rod group can be automatically separated from the positioning structure when the surrounding frame rod group and the rear wheel rod group are folded.

2. The backrest linkage folding vehicle according to claim 1, characterized in that: the seat surface rod group is provided with a seat surface support rod, a first connecting rod, a second connecting rod, a third connecting rod, a fourth connecting rod and a fifth connecting rod, the upper end of the first connecting rod is rotationally connected with the lower section of the surrounding frame rod group, the lower end of the first connecting rod is rotationally connected with the upper end of the second connecting rod, the middle section of the second connecting rod is rotationally connected with the rear wheel rod group, the lower end of the second connecting rod is rotationally connected with a connector, one end of the third connecting rod is rotationally connected with the front wheel rod group, the other end of the third connecting rod is rotationally connected with the fourth connecting rod, one end of the fourth connecting rod far away from the third connecting rod is rotationally connected with the rear wheel rod group, the fourth connecting rod is slidably arranged on the connecting head in a penetrating way, the lower end of the fifth connecting rod is rotatably connected with the upper section of the rear wheel rod group, one end of the seat surface support rod is rotatably connected with the first connecting rod, and the middle section of the seat surface support rod is rotatably connected with the upper end of the fifth connecting rod.

3. The backrest linkage folding vehicle according to claim 2, characterized in that: the positioning structure comprises a positioning concave position which is arranged on the first connecting rod in a downward concave manner, the lower end of the back rod group is rotatably connected with a region between the joint of the seat surface supporting rod and the first connecting rod and the joint of the back rod group and the fifth connecting rod, a back positioning rod is arranged on the back rod group corresponding to the positioning concave position, the back positioning rod falls into the positioning concave position when the enclosure rod group is completely unfolded relative to the rear wheel rod group, and the enclosure rod group automatically exits from the positioning concave position when the enclosure rod group is folded relative to the rear wheel rod group.

4. The backrest linkage folding vehicle according to claim 3, characterized in that: the backrest positioning rod can be movably and adjustably arranged on the backrest rod group towards the upper end of the backrest rod group, a positioning spring is arranged between the backrest positioning rod and the backrest rod group, and the positioning spring is used for keeping the backrest positioning rod at the lowest end in an adjusting stroke range in a normal state.

5. The backrest linkage folding vehicle according to claim 4, characterized in that: the backrest positioning rod comprises a first connecting rod and a backrest rod group, and is characterized in that a plurality of multistage clamping grooves are formed in the first connecting rod, a plurality of positioning concave positions are formed in the multistage clamping grooves, and the inclination angles of the backrest rod group relative to the vertical direction are different when the backrest positioning rod falls into different positioning concave positions.

6. The backrest linkage folding vehicle according to claim 4, characterized in that: the middle area of the backrest positioning rod has an upward arched structure.

7. The backrest linkage folding vehicle according to claim 4, characterized in that: the backrest rod group is provided with a backrest plate, and the backrest plate is provided with a yielding structure corresponding to the backrest positioning rod so as to allow the backrest positioning rod to move and adjust.

8. The backrest-linked folding cart according to claim 7, wherein: and a handle is arranged at the upper end of the back plate and on one side, close to the rear wheel rod group, of the front wheel rod group.

9. The backrest linkage folding vehicle according to claim 2, characterized in that: the fifth connecting rod is of a curved rod structure.

10. The backrest linkage folding vehicle according to claim 1, characterized in that: the folding bicycle with the backrest linked and folded further comprises an armrest rod group, the lower end of the armrest rod group is rotatably connected with the rear wheel rod group, a first rotation adjusting mechanism is arranged between the armrest rod group and the rear wheel rod group, the first rotation adjusting mechanism has at least two locking states, the armrest rod group is located above the front wheel rod group relative to the rear wheel rod group in one locking state, the armrest rod group is located above the rear wheel rod group relative to the front wheel rod group in the other locking state, and a first unlocking part for controlling the first rotation adjusting mechanism to unlock is arranged on the armrest rod group.

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