CN210903714U - Retractable aging-assistant shifting vehicle chassis - Google Patents

Abstract

The utility model provides a helping old people that can open and shut shifts vehicle chassis, including the chassis, locate the rear wheel subassembly on the chassis, locate the chassis both sides can open relatively or fold first pendulum leg and second pendulum leg, locate respectively first pendulum leg and second pendulum front wheel subassembly on the leg, locate the drive assembly that is used for on the chassis that first pendulum leg of drive and second pendulum leg swing open or fold, drive assembly includes: the driving assembly further comprises a third connecting rod fixedly connected with the second swing leg, one end of the third connecting rod, far away from the turntable, is provided with an electric push rod, and the first swing leg and the second swing leg are respectively installed at the end part, far away from the rear wheel assembly, of the chassis. The utility model discloses can avoid pendulum leg clamp foot in the leg division operation process, and can realize electronic leg division operation, improve the efficiency that the aversion vehicle chassis divides the leg to control.

Description

Retractable aging-assistant shifting vehicle chassis

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a help old aversion vehicle chassis that can open and shut.

Background

The multipurpose shifting vehicle in the medical field transfers and bears patients, the existing shifting vehicle mostly adopts a mechanical control mode to realize the opening and closing operation of a chassis of the shifting vehicle, and the operation is relatively troublesome.

Chinese patent authorization document (authorization publication number: CN208598668U) discloses a chassis leg separating device, which comprises a chassis, a first swing leg and a second swing leg which are arranged on two sides of the chassis in a swinging way and can be opened or closed relatively, and a driving mechanism for driving the first swing leg and the second swing leg to swing and open or close. The driving structure comprises a turntable which is rotationally arranged on the chassis; the two ends of the first transverse connecting rod are respectively and rotatably connected with the rotary disc and the first swing leg; the two ends of the second transverse connecting rod are respectively and rotatably connected with the rotary table and the second swing leg; a first driving rod with one end rotatably connected with the turntable and a second driving rod with one end rotatably connected with the turntable. Although this patent can make first pendulum leg and second pendulum leg separate certain angle as required to separate the angle and can adjust wantonly at the certain limit, but when controlling aversion vehicle chassis pendulum leg angle of opening and shutting, when the contained angle between pendulum leg and the chassis diminishes, the clearance between pendulum leg and the chassis presss from both sides the foot easily this moment, influences the normal use of aversion car, and the security also greatly reduced.

Disclosure of Invention

An object of the utility model is to provide a help old people's aversion vehicle chassis that can open and shut.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a helping old aversion vehicle chassis that can open and shut, includes chassis, rear wheel subassembly, can open or the second pendulum leg that folds relatively the chassis, locates the front wheel subassembly on first pendulum leg and second pendulum leg respectively, helping old aversion vehicle chassis still includes the drive assembly that drives first pendulum leg and second pendulum leg and open or fold, drive assembly includes: set up through pivot ground carousel on the chassis, both ends respectively with carousel and first pendulum leg rotate the first connecting rod of being connected, both ends respectively with carousel and second pendulum leg rotate the second connecting rod of being connected, drive assembly still include with second pendulum leg fixed connection's third connecting rod, the one end that the carousel was kept away from to the third connecting rod is installed electric putter, first pendulum leg and second pendulum leg are installed in one side and the symmetry setting on the chassis.

Furthermore, a fifth connecting rod is rotatably connected between the first connecting rod and the second swing leg, a fourth connecting rod is rotatably connected between the second connecting rod and the first swing leg, and the third connecting rod is fixedly installed on the fifth connecting rod; or, the third connecting rod is fixedly arranged on the fourth connecting rod.

Furthermore, a stop block for limiting the rotation angle of the turntable is arranged on the chassis.

Furthermore, the turntable is provided with a protruding part which is positioned between the stop blocks.

Further, the carousel is a rhombus-like structure, the upper end and the lower extreme of carousel are equipped with respectively and rotate the first connecting axle of being connected and rotate the second connecting axle of being connected with the second connecting rod with first connecting rod, the left end and the right-hand member of carousel are equipped with third connecting axle and fourth connecting axle respectively, it is connected with first actuating lever to rotate on the third connecting axle, it is connected with the second actuating lever to rotate on the fourth connecting axle, the one end that the carousel was kept away from to first actuating lever is connected with first pedal, the one end that the carousel was kept away from to the second actuating lever is connected with pedal of second, works as the drive first pedal or pedal drive of second the carousel rotates, first pendulum leg, second pendulum leg fold or open.

Furthermore, a fifth connecting shaft which is rotatably connected with the first pedal and the second pedal is arranged on the chassis, and a supporting shaft is connected between the first pedal and the second pedal.

Furthermore, the first connecting shaft and the second connecting shaft are symmetrically arranged on the front side and the rear side of the pivot, and the third connecting shaft and the fourth connecting shaft are symmetrically arranged on the left side and the right side of the pivot.

Furthermore, the chassis is movably provided with a locking pin, the locking pin comprises a knob, a mounting sleeve, a movable shaft, a spring and a limiting shaft, the mounting sleeve is fixed on the chassis, the mounting sleeve is internally provided with a movable through hole, the movable shaft is movably inserted in the movable through hole, the knob is mounted at one end of the movable shaft far away from the chassis, the limiting shaft is mounted at one end of the movable shaft far away from the knob, a first boss is arranged at one end of the limiting shaft close to the movable shaft, a second boss is arranged at one end of the mounting sleeve close to the movable shaft, the spring is mounted between the first boss and the second boss and sleeved on the periphery of the movable shaft, a sleeve is arranged at one end of the knob close to the mounting sleeve, the sleeve is sleeved on the periphery of the mounting sleeve, a mounting cavity is arranged in the sleeve, the inner wall of the mounting cavity is provided with limiting ribs, a movable, and the rear wheel component is provided with a positioning hole for moving the limiting shaft.

Furthermore, spacing muscle is equipped with a plurality ofly and sets up along installation cavity inner wall circumference interval, the number of movable groove sets up with the number one-to-one of spacing muscle.

Furthermore, the inner diameter of the limiting rib is d1, the inner diameter of the mounting sleeve is d2, and d2 is not less than d 1.

After the technical scheme is adopted, the utility model has the advantages of as follows:

1. when the electric push rod pushes the third connecting rod, the third connecting rod drives the first connecting rod to drive the rotary table to rotate anticlockwise, the first connecting rod drives the second swing leg to swing towards the direction far away from the first swing leg, and the rotary table rotates anticlockwise, so that the second connecting rod drives the first swing leg to swing towards the direction far away from the second swing leg in the opposite direction, and further the included angle between the first swing leg and the second swing leg is increased, so that the shifting vehicle can obtain higher stability under the condition that the shifting vehicle does not need to pass through a narrow channel, and the use safety of the shifting vehicle is improved; when the third connecting rod is pulled by the electric push rod, the third connecting rod drives the first connecting rod to drive the rotary table to rotate clockwise, the first connecting rod drives the second swing leg to swing towards the direction close to the first swing leg, and the rotary table rotates clockwise, so that the second connecting rod drives the first swing leg to swing towards the direction close to the second swing leg, the included angle between the first swing leg and the second swing leg is reduced, the shift car can conveniently pass through a narrow passageway, the motor can be controlled to work through a remote switch due to the fact that the mode for driving the swing legs is motor driving, the opening and closing angle of the swing legs of the chassis can be controlled remotely by the shift car, the control of the shift car to move in the narrow passageway is facilitated, and due to the fact that the first swing leg and the second swing leg are installed on one side of the chassis and are symmetrically arranged, and the setting is carried out, the danger that the included angle between the swing legs and the chassis can not cause foot.

2. Through rotating between first connecting rod and second pendulum leg and being connected the fifth connecting rod to rotate between second connecting rod and first pendulum leg and be connected the fourth connecting rod, with third connecting rod fixed mounting on the fifth connecting rod, so set up, reduced first connecting rod and the wobbling range of second connecting rod, can guarantee to carry out drive assembly's overall arrangement in the chassis of less area, guarantee that this chassis inner space is compacter.

3. The stopper can restrict the carousel pivoted angle effectively, and then control the swing range of leg swing to make the shifting vehicle chassis convenient removal.

4. The bulge on the turntable swings between the stop blocks, and the rotation angle of the turntable is limited under the limiting action of the stop blocks, so that the swing leg swinging amplitude is controlled, and the chassis of the shifting vehicle can move conveniently.

5. The left end and the right end of carousel are equipped with third connecting axle and fourth connecting axle respectively, the first actuating lever has been connected in the rotation on the third connecting axle, the second actuating lever has been connected in the rotation on the fourth connecting axle, the first actuating lever swing of first pedal drive, the second actuating lever swing of second pedal drive, thereby control first pendulum leg and second pendulum leg fold or open, realized that the opening and shutting of first pendulum leg and second pendulum leg is by first pedal and the pedal control of second, realized under the motor damages or the circumstances of not having the electricity, can be by the first pedal and the pedal size of the contained angle between first pendulum leg and the second pendulum leg of second of control of second.

6. Connect the back shaft between first pedal and second are pedal, and it is more stable when can realizing that first pedal and second are pedal tramples, guarantee the stability when aversion car uses.

7. When first actuating lever or second actuating lever drive carousel rotated, the carousel can drive first connecting rod and the synchronous rotation of second connecting rod of connecting on first connecting axle and second connecting axle, and is flexible in step for the chassis.

8. When using, make the loose axle flexible removal in the activity through-hole through the pulling knob, and rotate the knob and make spacing muscle contradict with the installation sleeve pipe up end, spacing axle leaves the locating hole on the rear wheel subassembly this moment, the spring is compressed by first boss and second boss, the stop pin is in the unblock state this moment, when needing for the spacing orientation of universal wheel, rotatory knob makes spacing muscle enter into the activity inslot this moment, make the direction of activity axial locating hole launch under the elastic restoring force effect of spring, thereby realize that spacing axle enters into in the locating hole, make the universal wheel realize the orientation in the cooperation of spacing axle and locating hole, make the chassis keep fixed direction to remove, the direction is changeed when the aversion car of being convenient for removes at long distance and is controlled, it is more stable when the aversion car removes.

9. Spacing muscle establish a plurality ofly and set up along installation cavity inner wall axial interval, realize when the stop pin locking state, guarantee that the knob is stable contradicted at the installation sleeve pipe up end, stability when having guaranteed the stop pin locking state.

10. The internal diameter less than or equal to installation sleeve pipe's internal diameter of spacing muscle sets up the lower terminal surface that can realize spacing muscle from this and can contradict completely on installation sleeve pipe up end, has effectively increased the lifting surface area of terminal surface under the spacing muscle, guarantees when the stop pin is in the unblock state, and the knob is stabilized to be contradicted at installation sleeve pipe's up end, guarantees the stability of stop pin locking state.

Drawings

The present invention will be further explained with reference to the accompanying drawings:

fig. 1 is a bottom view structure schematic diagram of a first embodiment of the chassis of the utility model.

Fig. 2 is a schematic structural view of a turntable in an embodiment of a chassis of the shift car of the present invention.

Fig. 3 is a schematic structural view of a second embodiment of the chassis of the present invention.

Fig. 4 is a bottom view structure diagram of the second embodiment of the chassis of the utility model.

Fig. 5 is a schematic structural view of a rear wheel assembly in the second embodiment of the chassis of the utility model.

Fig. 6 is an explosion diagram of the locking pin in the second embodiment of the chassis of the utility model.

Fig. 7 is an explosion diagram of the knob and the mounting sleeve in the second embodiment of the chassis of the utility model.

Fig. 8 is a cross-sectional view of a locking pin in the second embodiment of the chassis of the present invention.

Fig. 9 is a partially enlarged schematic view of a portion a of fig. 8.

The names of the components marked in the figures are as follows:

c1, a chassis; c2, rear wheel assembly; c201, universal wheels; c202, an orientation plate; c203, positioning holes; c3, a first swing leg; c4, a second swing leg; c5, a driving assembly; c501, a pivot; c502, a turntable; c5021 and a boss; c503, a first connecting rod; c504, a second connecting rod; c505, a third connecting rod; c506, an electric push rod; c507, a fourth connecting rod; c508, a fifth connecting rod; c509, a first connecting shaft; c510, a second connecting shaft; c511 and a third connecting shaft; c512, a fourth connecting shaft; c513, a first driving rod; c514, a second driving rod; c515, a first pedal; c516, second treading; c517 and a fifth connecting shaft; c518, supporting a shaft; c6, front wheel assembly; c7, a stop block; c8, locking pin, C801, knob; c802, installing a sleeve; c803, a movable groove; c804, a second boss; c805, a movable shaft; c806, a spring; c807, a first boss; c808, limiting a shaft; c809, a sleeve; c810, limiting ribs; c811, mounting a cavity; c812, a movable through hole.

Detailed Description

The invention will be further explained with reference to the drawings and the specific embodiments. It is to be understood that the following terms "upper," "lower," "left," "right," "longitudinal," "lateral," "inner," "outer," "vertical," "horizontal," "top," "bottom," and the like are used in an orientation or positional relationship relative to one another only as illustrated in the accompanying drawings and are used merely for convenience in describing and simplifying the invention, and do not indicate or imply that the device/component so referred to must have a particular orientation or be constructed and operated in a particular orientation and therefore should not be considered as limiting the invention.

The first embodiment is as follows:

as shown in fig. 1 and 2, the utility model provides a retractable assistant vehicle chassis, including chassis C1, locate rear wheel subassembly C2 on chassis C1, locate first pendulum leg C3 and second pendulum leg C4 that chassis C1 both sides can be opened relatively or be closed up, locate front wheel subassembly C6 on first pendulum leg C3 and second pendulum leg C4 respectively, locate the drive assembly C5 that is used for driving first pendulum leg C3 and second pendulum leg C4 swing on chassis C1 and open or close up, drive assembly C5 includes: the driving assembly further comprises a third connecting rod C505 fixedly connected with the second swing leg C4, an electric push rod C506 is mounted at one end, far away from the rotary disc C502, of the third connecting rod C505, and the first swing leg C3 and the second swing leg C4 are respectively mounted on one side of the chassis C1 and are symmetrically arranged. When the electric push rod C506 pushes the third link C505, the third link C505 drives the first link C503 to drive the turntable C502 to rotate counterclockwise, the first link C503 drives the second swing leg C4 to swing in a direction away from the first swing leg C3, and the turntable C502 rotates counterclockwise, so that the second link C504 drives the first swing leg C3 to swing in a reverse direction away from the second swing leg C4, and thus an included angle between the first swing leg C3 and the second swing leg C4 is increased, so that the shift cart can obtain higher stability without passing through a narrow passage, and the safety of the shift cart is improved; when the electric push rod C506 pulls the third link C505, the third link C505 drives the first link C503 to drive the rotating disc C502 to rotate clockwise, the first link C503 drives the second swing leg C4 to swing in a direction close to the first swing leg C3, and the rotating disc C502 rotates clockwise, so that the second connecting rod C504 drives the first swing leg C3 to swing towards the direction close to the second swing leg C4, thereby realizing the reduction of the included angle between the first swing leg C3 and the second swing leg C4, facilitating the passage of the shift car through narrow passages, and because the mode of driving the swing legs is motor driving, the work of the motor can be controlled through the remote switch, the remote control of the opening and closing angle of the swing legs of the chassis C1 of the shift car can be realized, the control of the shift car moving in a narrow passageway is convenient, and since the first swing leg C3 and the second swing leg C4 are installed at one side of the chassis C1 and are symmetrically arranged, so that, it is ensured that the angle between the swing leg and the chassis C1 does not pose a risk of pinching the foot of the user.

In this embodiment, a fifth link C508 is rotatably connected between the first link C503 and the second swing leg C4, a fourth link C507 is rotatably connected between the second link C504 and the first swing leg C3, the third link C505 is fixedly mounted on the fifth link C508, and the fifth link C508 is rotatably connected between the first link C503 and the second swing leg C4, and the fourth link C507 is rotatably connected between the second link C504 and the first swing leg C3, and the third link C505 is fixedly mounted on the fifth link C508.

In this embodiment, a stopper C7 for limiting the rotation angle of the turntable C502 is provided on the chassis C1. The stop C7 can effectively limit the rotation angle of the turntable C502, and further control the swing amplitude of the swing leg, so that the chassis of the shift vehicle can move conveniently.

In this embodiment, the turntable C502 is provided with a boss 5021, and the boss C5021 is located between the stoppers C7. The boss C5021 on the turntable C502 swings between the stoppers C7, and the rotation angle of the turntable C502 is limited under the limiting action of the stoppers C7, so that the swing amplitude of the swing legs is controlled, and the chassis of the shift car can move conveniently.

It is understood that the third link C505 may also be fixedly mounted on the fourth link C507. With the arrangement, the swing amplitude of the first connecting rod C503 and the second connecting rod C504 is reduced, the layout of the driving assembly C5 in the chassis C1 with smaller area can be ensured, and the internal space of the chassis C1 is ensured to be more compact.

Example two:

as shown in fig. 3 to 9, the difference between the second embodiment and the first embodiment is that the rotary plate C502 is of a rhomboid structure, the upper end and the lower end of the rotary plate C502 are respectively provided with a first connecting shaft C509 rotatably connected to the first connecting rod C503 and a second connecting shaft C510 rotatably connected to the second connecting rod C504, the left end and the right end of the rotary plate C502 are respectively provided with a third connecting shaft C511 and a fourth connecting shaft C512, the third connecting shaft C511 is rotatably connected to a first driving rod C513, the fourth connecting shaft C512 is rotatably connected to a second driving rod C514, one end of the first driving rod C513, which is far away from the rotary plate C502, is connected to a first pedal C515, one end of the second driving rod C514, which is far away from the rotary plate C502, is connected to a second pedal C516, and when the first pedal C515 or the second pedal C516 is driven to drive the rotary plate C502 to rotate, the first swing leg C3 and the second swing leg. The left end and the right end of the rotating disc C502 are respectively provided with a third connecting shaft C511 and a fourth connecting shaft C512, the third connecting shaft C511 is rotatably connected with a first driving rod C513, the fourth connecting shaft C512 is rotatably connected with a second driving rod C514, the first pedal C515 drives the first driving rod C513 to swing, and the second pedal C516 drives the second driving rod C514 to swing, so that the first swing leg C3 and the second swing leg C4 are controlled to be folded or unfolded, the first swing leg C3 and the second swing leg C4 are controlled by the first pedal C515 and the second pedal C516, and the size of an included angle between the first swing leg C3 and the second swing leg C4 can be controlled by the first pedal C515 and the second pedal C516 under the condition that a motor is damaged or the motor is not powered.

In this embodiment, the chassis C1 is provided with a fifth connecting shaft C517 rotatably connected to the first pedal C515 and the second pedal C516, and a supporting shaft C518 is further connected between the first pedal C515 and the second pedal C516. The supporting shaft C518 is connected between the first pedal C515 and the second pedal C516, so that the first pedal C515 and the second pedal C516 are more stable when being pedaled, and the stability of the shifting vehicle in use is ensured.

In this embodiment, the first connecting shaft C509 and the second connecting shaft C510 are symmetrically disposed at the front and rear sides of the pivot C501, and the third connecting shaft C511 and the fourth connecting shaft C512 are symmetrically disposed at the left and right sides of the pivot C501. When the first driving rod C513 or the second driving rod C514 drives the rotating disc C502 to rotate, the rotating disc C502 can drive the first connecting rod C506 and the second connecting rod C504 connected to the first connecting shaft C509 and the second connecting shaft C510 to synchronously rotate, and synchronously extend and retract relative to the chassis C5022.

In this embodiment, the rear wheel assembly C2 includes a positioning plate C202 and a universal wheel C201, the universal wheel is disposed on the positioning plate, a bottom plate C1 is movably mounted with a locking pin C8, the locking pin C8 includes a knob C801, a mounting sleeve C802, a movable shaft C805, a spring C806 and a limiting shaft C808, the mounting sleeve C802 is fixed on the bottom plate C1, a movable through hole C812 is disposed in the mounting sleeve C802, the movable shaft C805 is movably inserted in the movable through hole C812, the knob C801 is mounted at an end of the movable shaft C805 away from the bottom plate C1, the limiting shaft C808 is mounted at an end of the movable shaft C805 away from the knob C801, a first boss C807 is disposed at an end of the limiting shaft C808 close to the movable shaft C805, a second boss C804 is disposed at an end of the mounting sleeve C802 close to the movable shaft C805, the spring C806 is mounted between the first boss C807 and the second boss C804 and at an outer periphery of the movable shaft C805, a sleeve 809 is disposed, sleeve C809 cup joints in installation sleeve C802 periphery, is equipped with installation cavity C811 in the sleeve C809, and the inner wall of installation cavity C811 is equipped with spacing muscle C810, and installation sleeve C802 is equipped with the activity groove C803 that supplies spacing muscle C810 to move about from top to bottom in the circumference, is equipped with the locating hole C203 that supplies spacing axle C808 activity on the directional board C202. In use, by pulling the knob C801, the movable shaft C805 moves in a telescopic way in the movable through hole C812, and the knob C801 is rotated to enable the limiting rib C810 to abut against the upper end face of the mounting sleeve C802, at the moment, the limiting shaft C808 leaves the positioning hole C203 on the directional plate C202, the spring is compressed by the first boss C807 and the second boss C804, at the moment, the locking pin C8 is in an unlocking state, when the universal wheel C201 needs to be limited and oriented, the knob C801 is rotated at the moment, so that the limiting rib C810 enters the movable groove C803, the movable shaft C805 is ejected in the direction of the positioning hole C203 by the elastic restoring force of the spring C806, thereby realizing that the limiting shaft C808 enters the positioning hole C203, leading the universal wheel C201 to realize orientation in the matching of the limiting shaft C808 and the positioning hole C203, make chassis C1 keep fixed direction to remove, the direction is more easily controlled when being convenient for the aversion car moves long distance, and is more stable when the aversion car moves.

In this embodiment, the limiting ribs C810 are provided in a plurality and arranged along the circumferential direction of the inner wall of the mounting cavity C811 at intervals, and the number of the movable grooves C803 and the number of the limiting ribs C810 are arranged in a one-to-one correspondence manner. In this embodiment, spacing muscle C810 is equipped with two, and spacing muscle C810 sets up along installation cavity C811 inner wall axial interval, realizes when the locking pin C8 locking state, guarantees that the knob is stabilized to be contradicted at installation sleeve pipe C802 up end, has guaranteed the stability when locking pin C802 locking state.

In the embodiment, the inner diameter of the limiting rib C810 is d1, the inner diameter of the mounting sleeve C802 is d2, and d2 is not less than d 1. The internal diameter less than or equal to installation sleeve C802 of spacing muscle C810, set up from this and can realize that the lower terminal surface of spacing muscle C810 can conflict completely on installation sleeve C802 up end, effectively increased the lifting surface area of terminal surface under the spacing muscle C810, guarantee when stop pin C8 is in the unblock state, knob C801 stably contradicts at the up end of installation sleeve C802, guarantee the stability of stop pin C8 locking state.

Other structures and advantages of the parts not described are the same as those of the first embodiment, and are not described in detail here.

It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions, and the terms "comprise", "include", or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the spirit and scope of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. The utility model provides a helping old aversion vehicle chassis that can open and shut, includes chassis, rear wheel subassembly, can open or the second pendulum leg that folds relatively the chassis, locates the front wheel subassembly on first pendulum leg and second pendulum leg respectively, helping old aversion vehicle chassis still includes the drive assembly that drives first pendulum leg and second pendulum leg and open or fold, drive assembly includes: set up through pivot ground carousel on the chassis, both ends respectively with carousel and first pendulum leg rotate the first connecting rod of being connected, both ends respectively with carousel and second pendulum leg rotate the second connecting rod of being connected, its characterized in that, drive assembly still include with second pendulum leg fixed connection's third connecting rod, the one end that the carousel was kept away from to the third connecting rod is installed electric putter, first pendulum leg and second pendulum leg are installed in one side and the symmetry setting on the chassis.

2. The chassis for the aged people shift according to claim 1, wherein a fifth connecting rod is rotatably connected between the first connecting rod and the second swing leg, a fourth connecting rod is rotatably connected between the second connecting rod and the first swing leg, and the third connecting rod is fixedly installed on the fifth connecting rod; or, the third connecting rod is fixedly arranged on the fourth connecting rod.

3. The aging shift vehicle chassis according to claim 1, wherein the chassis is provided with a stopper for limiting the rotation angle of the turntable.

4. The aging shift vehicle chassis according to claim 3, wherein the turntable is provided with a convex part, and the convex part is positioned between the stop blocks.

5. The chassis of the assistant shifting vehicle as claimed in claim 1, wherein the turntable is of a rhomboid structure, the upper end and the lower end of the turntable are respectively provided with a first connecting shaft rotatably connected with the first connecting rod and a second connecting shaft rotatably connected with the second connecting rod, the left end and the right end of the turntable are respectively provided with a third connecting shaft and a fourth connecting shaft, the third connecting shaft is rotatably connected with a first driving rod, the fourth connecting shaft is rotatably connected with a second driving rod, one end of the first driving rod, which is far away from the turntable, is connected with a first pedal, one end of the second driving rod, which is far away from the turntable, is connected with a second pedal, when the first pedal or the second pedal is driven to drive the turntable to rotate, the first swing leg and the second swing leg are folded or unfolded.

6. The assistant shifting vehicle chassis according to claim 5, wherein a fifth connecting shaft is provided on the chassis for rotatably connecting the first and second pedals, and a supporting shaft is further connected between the first and second pedals.

7. The aging-assistant shifting vehicle chassis according to claim 5, wherein the first connecting shaft and the second connecting shaft are symmetrically arranged at the front side and the rear side of the pivot, and the third connecting shaft and the fourth connecting shaft are symmetrically arranged at the left side and the right side of the pivot.

8. The chassis for the aged people shift vehicle according to claim 1, wherein the chassis is movably mounted with a locking pin, the locking pin comprises a knob, a mounting sleeve, a movable shaft, a spring and a limiting shaft, the mounting sleeve is fixed on the chassis, the mounting sleeve is provided with a movable through hole, the movable shaft is movably inserted into the movable through hole, the knob is mounted at one end of the movable shaft away from the chassis, the limiting shaft is mounted at one end of the movable shaft away from the knob, the limiting shaft is provided with a first boss at one end close to the movable shaft, the mounting sleeve is provided with a second boss at one end close to the movable shaft, the spring is mounted between the first boss and the second boss and is sleeved at the periphery of the movable shaft, the knob is provided with a sleeve at one end close to the mounting sleeve, the sleeve is sleeved at the periphery of the mounting sleeve, a mounting cavity is provided in the sleeve, and the inner, the mounting sleeve is circumferentially provided with a movable groove for the limiting rib to move up and down, and the rear wheel assembly is provided with a positioning hole for the limiting shaft to move.

9. The aging-assistant shifting vehicle chassis according to claim 8, wherein a plurality of limiting ribs are arranged at intervals along the circumferential direction of the inner wall of the mounting cavity, and the number of the movable grooves and the number of the limiting ribs are arranged in a one-to-one correspondence manner.

10. The aging-assistant shifting vehicle chassis of claim 8, wherein the inner diameter of the limiting rib is d1, the inner diameter of the mounting sleeve is d2, and d1 is not more than d 2.

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