CN116919736A - Foldable wheelchair - Google Patents

Abstract

The invention provides a foldable wheelchair, which comprises a wheelchair frame and a wheel assembly, wherein the wheelchair frame comprises a front wheel support, a rear wheel support, an adapter plate, a back support, a seat support and a bottom connecting rod, wherein the upper end part of the front wheel support is rotationally connected with the bottom of the seat support through a first rotating shaft, the upper end part of the rear wheel support is rotationally connected with the bottom of the seat support through a second rotating shaft, the upper end part of the rear wheel support is rotationally connected with the middle part of the back support through a second rotating shaft, the adapter plate is rotationally connected with the middle part of the back support, the lower end part of the back support is rotationally connected with the back support, the seat support and the bottom connecting rod are rotationally connected with the back end part of the bottom connecting rod, the front wheel support and the front end part of the front wheel support are rotationally connected with the middle part of the front wheel support, the seat support, the back support and the bottom connecting rod form a first four-bar mechanism, and the back support and the adapter plate form a second four-bar mechanism, and when the back support rotates relative to the seat support, the seat support rotates relative to the seat support, the first four-bar mechanism and the second four-bar mechanism can be driven to act, so that the wheelchair frame can be converted between an unfolded and folded state, and has convenient operation, good riding comfort and small occupied space after folding.

Description

Foldable wheelchair

Technical Field

The invention relates to the field of medical appliances, in particular to a foldable wheelchair.

Background

The wheelchair is provided with wheels and can help to replace a walking chair, is an important moving tool for the home rehabilitation, turnover transportation, treatment and outgoing activities of wounded persons, patients and disabled persons, and generally consists of a foldable frame, left and right side plates (skirt guard plates), front and rear wheels, left and right knee pads, foot pedals, left and right handrails, a handle brake device, a seat and the like.

In order to solve the problem, a foldable wheelchair capable of being folded back and forth appears in the market, and when the wheelchair is folded, the seat is in a back and forth overturning state, and the wheelchair can be rigidly supported by adopting the seat with the transverse framework, so that the supporting effect is good; however, due to the existence of the seat, when the wheelchair is folded, the wheel brackets are folded or are staggered up and down, or are flush but cannot be mutually close, so that the occupied space is large after folding, and meanwhile, the foldable wheelchair has the advantages of more complicated bracket structural design, more folding actions, complex operation and unfriendly to older users.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the foldable wheelchair which is convenient to operate, good in riding comfort and small in occupied space after being folded.

In order to achieve the above purpose, the technical scheme provided by the invention is that the foldable wheelchair comprises a foldable wheelchair frame and a wheel assembly arranged at the bottom of the wheelchair frame, wherein the wheelchair frame comprises a front wheel bracket, a rear wheel bracket, an adapter plate, a backrest bracket, a seat bracket and a bottom connecting rod, the upper end part of the front wheel bracket is rotationally connected with the bottom of the seat bracket through a first rotating shaft, and the middle part of the front wheel bracket is rotationally connected with the front end part of the bottom connecting rod; the upper end part of the rear wheel bracket is rotationally connected with the bottom of the seat bracket through a second rotating shaft positioned behind the first rotating shaft; the adapter plate is positioned between the rear wheel bracket and the backrest bracket, the upper end part of the adapter plate is rotationally connected with the middle part of the backrest bracket, and the lower end part of the adapter plate is rotationally connected with the middle part of the rear wheel bracket; the lower end part of the backrest bracket is rotationally connected with the rear end part of the bottom connecting rod; the front wheel support, the seat support, the backrest support and the bottom connecting rod form a first four-bar linkage mechanism, the rear wheel support, the seat support, the backrest support and the adapter plate form a second four-bar linkage mechanism, and when the backrest support rotates relative to the seat support, the wheelchair frame can be changed between an unfolding state and a folding state by driving the first four-bar linkage mechanism and the second four-bar linkage mechanism to act.

Preferably, the foldable wheelchair further comprises a wheelchair frame locking mechanism for locking the wheelchair frame in an unfolded state, the wheelchair frame locking mechanism comprises a locking hook plate rotatably connected to the rear end of the seat support and a locking rod connected to the backrest support, and when the locking hook plate hooks the locking rod, the relative positions of the backrest support and the seat support are kept locked.

Further preferably, the locking hook plate has at least one hook tooth, and the hook tooth is located at the rear of the locking rod when the locking hook plate hooks the locking rod.

Further preferably, the wheelchair frame locking mechanism further includes a torsion spring, the torsion spring is sleeved on the rotation shaft of the locking hook plate, two ends of the torsion spring respectively support against the seat support and the locking hook plate, and the torsion spring has a tendency of driving the locking hook plate to rotate in a direction of hooking the locking rod.

Preferably, the middle part of the adapter plate is bent, so that an included angle is formed between the upper end part of the adapter plate and the lower end part of the adapter plate, the included angle is an obtuse angle, when the wheelchair frame is in an unfolding state, the projection of the upper end part of the connecting plate in the left-right direction is positioned in the projection area of the backrest bracket in the left-right direction, and the projection of the lower end part of the connecting plate in the left-right direction is positioned in the projection area of the rear wheel bracket in the left-right direction.

Preferably, the wheelchair frame further comprises a backrest surrounding frame and an armrest support, wherein the backrest surrounding frame is shaped like a Chinese character 'kou' and is connected to the upper end part of the backrest support, and the armrest support is rotatably connected to the outer side surface of the backrest surrounding frame.

Further preferably, the armrest support comprises an elbow support plate arranged above the seat support in parallel and a connecting support plate connected to the rear end of the elbow support plate and extending obliquely backward and downward, and the rear end of the connecting support plate is rotatably connected with the bottom of the outer side surface of the backrest frame.

Still preferably, the foldable wheelchair further includes a handrail support locking mechanism for locking the relative position of the handrail support and the backrest enclosure frame, the handrail support locking mechanism includes a first lock hole provided on the outer side surface of the backrest enclosure frame, a second lock hole provided on the inner side of the connection support plate, a lock ring, and lock teeth connected to the outer wall of the lock ring, a first lock groove is provided on the inner wall of the first lock hole, a second lock groove is provided on the inner wall of the second lock hole, the first lock hole, the second lock hole and the rotation shaft of the connection support plate are coaxially arranged, the first lock hole and the second lock hole are aligned and enclose a lock cavity, and the lock ring is axially slidably provided in the lock cavity;

when the lock ring is positioned in the first lock hole and the second lock hole, the lock teeth are meshed with the first lock groove and the second lock groove, and the handrail bracket locking mechanism is locked; when the lock ring is positioned in the first lock hole or the second lock hole, the lock teeth are meshed with the first lock groove or the second lock groove, and the handrail support locking mechanism is unlocked.

Further preferably, the armrest support locking mechanism further comprises a spring and an unlocking button, the spring is arranged in the first lock hole, two ends of the spring respectively abut against the bottom wall of the first lock hole and the inner side surface of the lock ring, and the spring has a tendency of driving the lock ring to slide outwards into the first lock hole and the second lock hole;

the unlocking button comprises a round cover and pushing teeth, the round cover is arranged on the outer side face of the connecting support plate, the pushing teeth are connected to the end face of the annular flange on the inner side of the round cover, the pushing teeth can axially slide to penetrate through the connecting support plate, the end portions of the pushing teeth extend into the second lock holes and are in contact with the outer side face of the lock ring, and when the round cover is pressed down, the lock ring can be pushed to be separated from the second lock holes.

Further preferably, the inner side of the locking ring is provided with an annular groove for receiving the outer end of the spring.

Further preferably, the first locking groove and the second locking groove are both multiple and uniformly distributed around the rotation shaft of the connection support plate, the locking teeth are correspondingly arranged with the first locking groove and the second locking groove, and the pushing teeth are correspondingly arranged with the locking teeth.

Further preferably, the foldable wheelchair further comprises a power supply for supplying power to the driving motor on the wheel assembly and a controller for controlling the driving motor to rotate, wherein the power supply is arranged on a U-shaped power supply support plate which is arranged on the bottom connecting rod, and the controller is arranged at the front end part of the armrest support.

Preferably, the seat support comprises a seat support outer frame, a middle cross beam and a rear cross beam which are connected in the seat support outer frame, and an arc-shaped base which is clamped at the bottom of the middle cross beam and extends towards two sides in an arc shape, the front end of the arc-shaped base is rotatably connected with the upper end of the front wheel support through a first rotating shaft, and the rear end of the arc-shaped base is rotatably connected with the upper end of the rear wheel support through a second rotating shaft.

Still preferably, the front wheel support comprises a front wheel support frame and front ear plates connected to the top of the front wheel support frame, the front ear plates are arranged in two and left-right direction at intervals, the front ear plates are rotatably connected with the arc-shaped base through the first rotating shaft, and the part of the arc-shaped base between the front ear plates extends forwards and downwards and is attached to the front side surface of the front wheel support frame.

Further preferably, the front wheel support further comprises a front cross beam connected in the outer frame of the front wheel support, and the middle part of the front cross beam is rotatably connected with the upper end part of the pedal support.

Still preferably, the rear wheel support comprises a rear wheel support frame and rear ear plates connected to the top of the rear wheel support frame, the number of the rear ear plates is two, the rear ear plates are arranged at intervals along the left-right direction, and the rear ear plates are rotatably connected with the arc-shaped base through the second rotating shaft.

Further preferably, the first rotation axis is parallel to the second rotation axis and forms a virtual plane, and the virtual plane is parallel to the plane of the seat support frame.

Further preferably, the distance between the axis of the first rotating shaft and the axis of the second rotating shaft is 30% -35% of the length of the bottom connecting rod, and the distance between the virtual plane and the plane of the seat support frame is 50% -70% of the thickness of the seat support frame in the up-down direction.

Further preferably, a clamping groove for clamping the middle cross beam is formed in the top of the arc-shaped base, and a notch of the clamping groove is welded with the side wall of the middle cross beam.

Further preferably, the arc-shaped base is provided with a plurality of weight-reducing grooves penetrating through the arc-shaped base along the left-right direction.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

the invention provides a foldable wheelchair, which comprises a foldable wheelchair frame and a wheel assembly arranged at the bottom of the wheelchair frame, wherein the wheelchair frame comprises a front wheel bracket, a rear wheel bracket, an adapter plate, a backrest bracket, a seat bracket and a bottom connecting rod, the upper end part of the front wheel bracket is rotationally connected with the bottom of the seat bracket through a first rotating shaft, and the middle part of the front wheel bracket is rotationally connected with the front end part of the bottom connecting rod; the upper end part of the rear wheel bracket is rotationally connected with the bottom of the seat bracket through a second rotating shaft positioned behind the first rotating shaft; the adapter plate is positioned between the rear wheel bracket and the backrest bracket, the upper end part of the adapter plate is rotationally connected with the middle part of the backrest bracket, and the lower end part of the adapter plate is rotationally connected with the middle part of the rear wheel bracket; the lower end of the backrest bracket is rotationally connected with the rear end of the bottom connecting rod; the front wheel support, the seat support, the backrest support and the bottom connecting rod form a first four-bar mechanism, the rear wheel support, the seat support, the backrest support and the adapter plate form a second four-bar mechanism, when the backrest support rotates relative to the seat support, the first four-bar mechanism and the second four-bar mechanism can be driven to act, so that the wheelchair frame can be changed between an unfolding state and a folding state, the operation is convenient, a front-back folding mode is adopted, rigid support can be realized by utilizing the seat support, riding comfort is good, the front wheel support and the rear wheel support can be mutually closed without upper and lower dislocation during folding, and occupied space after folding is small.

Drawings

Fig. 1 and 2 are perspective views of a preferred embodiment of the present invention, in which the wheelchair frame is in an unfolded state.

Fig. 3, 4 and 5 are schematic left views showing a process of changing the wheelchair frame from the unfolded state to the folded state according to the preferred embodiment of the present invention, wherein the wheelchair frame in fig. 3 is in the unfolded state, the wheelchair frame in fig. 4 is in an intermediate state of changing from the unfolded state to the folded state, and the wheelchair frame in fig. 5 is in the folded state.

Fig. 6 is a schematic top view of fig. 3.

FIG. 7 is a schematic cross-sectional view taken in the direction A-A of FIG. 6.

Fig. 8 is a schematic perspective view of the armrest support, the back enclosure, the back support, and the adapter plate of fig. 3, wherein the armrest locking mechanism is further shown assembled and disassembled.

Fig. 9 is a partially enlarged schematic view at B in fig. 8.

Fig. 10 is a perspective view of the armrest support, the back enclosure, the back support and the adapter plate of fig. 5, with view angles adjusted for ease of viewing.

Fig. 11 is a left side schematic view of fig. 8.

Fig. 12 is a schematic cross-sectional view in the direction C-C of fig. 11.

Fig. 13 is a partially enlarged schematic view of fig. 12 at D.

Wherein: 10. a wheelchair frame; 11. a front wheel bracket; 111. a first rotation shaft; 112. the front wheel bracket outer frame; 113. a front ear plate; 114. a front cross member; 12. a rear wheel bracket; 121. a second rotation shaft; 122. a rear wheel bracket outer frame; 123. a rear ear panel; 124. a bottom cross beam; 13. an adapter plate; 14. a backrest bracket; 141. a backrest cross beam; 15. a seat support; 151. a seat support frame; 152. a middle cross beam; 153. a rear cross member; 154. an arc-shaped base; 155. a clamping groove; 156. a weight reduction groove; 157. a pressing part; 16. a bottom link; 17. a backrest surrounding frame; 18. a handrail support; 181. an elbow support plate; 182. a connecting support plate; 183. a receiving hole; 21. a front wheel assembly; 211. a buffer mechanism; 22. a rear wheel assembly; 221. a driving motor; 30. a wheelchair frame locking mechanism; 31. locking the hook plate; 32. a locking lever; 33. hooking teeth; 34. a torsion spring; 40. a handrail support locking mechanism; 41. a first lock hole; 42. a second lock hole; 43. a locking ring; 431. an annular groove; 44. locking teeth; 45. a first locking groove; 46. a second locking groove; 47. a lock cavity; 48. a spring; 49. an unlock button; 491. a dome; 492. pushing teeth; 50. a power supply; u-shaped power support plate; 60. a controller; 70. a foot pedal bracket.

Detailed Description

The present invention describes the left-right, front-rear, up-down directions as viewed when a user takes the foldable wheelchair provided by the present invention.

As shown in fig. 1 to 13, the foldable wheelchair provided by the invention comprises a foldable wheelchair frame 10 and a wheel assembly arranged at the bottom of the wheelchair frame 10, wherein the wheelchair frame 10 comprises a front wheel bracket 11, a rear wheel bracket 12, an adapter plate 13, a backrest bracket 14, a seat bracket 15 and a bottom connecting rod 16, when the wheelchair frame 10 is in an unfolding state, the front wheel bracket 11 obliquely extends from front lower side to rear upper side, the upper end part of the front wheel bracket 11 is rotationally connected with the bottom of the seat bracket 15 through a first rotating shaft 111, and the middle part of the front wheel bracket 11 is rotationally connected with the front end part of the bottom connecting rod 16; the rear wheel bracket 12 extends obliquely from the rear lower direction to the front upper direction, and the upper end part of the rear wheel bracket 12 is rotationally connected with the bottom of the seat bracket 15 through a second rotating shaft 121 positioned behind the first rotating shaft 111, so that the rear wheel bracket 12 and the front wheel bracket 11 can form a splayed supporting mechanism with a larger supporting span at the bottom of the seat bracket 15, and the stability of the wheelchair frame 10 in a unfolded state is improved; the adapter plate 13 is a vertical plate extending along the front-rear direction, the adapter plate 13 is positioned between the rear wheel bracket 15 and the backrest bracket 14, the upper end part of the adapter plate 13 is rotationally connected with the middle part of the backrest bracket 14, and the lower end part of the adapter plate 13 is rotationally connected with the middle part of the rear wheel bracket 12; the lower end of the backrest bracket 14 is rotatably connected with the rear end of the bottom link 16; the seat bracket 15 is high at the front and low at the rear, and the included angle between the seat bracket and the horizontal plane is about 5 degrees, so that riding comfort is improved; the front wheel support 11, the seat support 15, the backrest support 14 and the bottom link 16 are configured as a first four-bar linkage, and the rear wheel support 12, the seat support 15, the backrest support 14 and the adapter plate 13 are configured as a second four-bar linkage, so that the wheelchair frame 10 can be converted between an unfolded state and a folded state by driving the first four-bar linkage and the second four-bar linkage to operate when the backrest support 14 rotates relative to the seat support 15.

The advantage that sets up like this lies in, expands folding convenient operation, can utilize the seat support to realize rigid support, takes the travelling comfort good, and when folding, front wheel support and rear wheel support need not dislocation from top to bottom also can draw close each other, and occupation space is little after folding.

In this embodiment, the seat support 15 includes a seat support frame 151 having a door frame shape, a middle beam 152 and a rear beam 153 connected in the seat support frame 151, and an arc-shaped base 154 clamped at the bottom of the middle beam 152 and extending downward in an arc shape toward both sides, the projection of the arc-shaped base 154 in the left-right direction is in an arch bridge shape, the front end of the arc-shaped base 154 is rotatably connected with the upper end of the front wheel support 11 through a first rotation shaft 111, and the rear end of the arc-shaped base 154 is rotatably connected with the upper end of the rear wheel support 12 through a second rotation shaft 121.

In this embodiment, the foldable wheelchair further includes a wheelchair frame locking mechanism 30 for locking the wheelchair frame 10 in an unfolded state, the wheelchair frame locking mechanism 30 includes a locking hook plate 31 rotatably connected to the rear end portion of the seat frame 15 and a locking lever 32 connected to the back frame 14, specifically, the locking hook plate 31 is rotatably connected to the middle portion of the rear cross member 153, the rotation axis of the locking hook plate 31 extends horizontally in the left-right direction, the locking lever 32 is connected to the back cross member 141 provided between the back frames 14 and extends horizontally in the left-right direction, and the relative positions of the back frame 14 and the seat frame 15 remain locked when the locking hook plate 31 hooks the locking lever 32.

The locking hook plate 31 has a hook tooth 33, and when the locking hook plate 31 hooks the locking rod 32, the hook tooth 33 is attached to the surface of the locking rod 32 and located behind the locking rod 32, so as to prevent the back support 14 from rotating backwards relative to the seat support 15, and ensure that the wheelchair frame 10 can be stabilized in the unfolded state.

Further, the wheelchair frame locking mechanism 30 further includes a torsion spring 34, the torsion spring 34 is sleeved on the rotation shaft of the locking hook plate 31, two ends of the torsion spring 34 respectively abut against the rear cross beam 153 of the seat support 15 and the locking hook plate 31, and the torsion spring 34 has a tendency to drive the locking hook plate 31 to rotate in a direction of hooking the locking rod 32, so as to avoid the locking hook plate 31 from loosening.

In this embodiment, the middle part of the adapter plate 13 is bent, so that an included angle is formed between the upper end part of the adapter plate 13 and the lower end part of the adapter plate 13, the included angle is an obtuse angle, when the wheelchair frame 10 is in an unfolded state, the projection of the upper end part of the connecting plate 13 in the left-right direction is located in the projection area of the backrest support 14 in the left-right direction, and the projection of the lower end part of the connecting plate 13 in the left-right direction is located in the projection area of the rear wheel support 12 in the left-right direction.

In this embodiment, the wheelchair frame 10 further includes a backrest surrounding frame 17 and an armrest support 18, where the backrest surrounding frame 17 is shaped like a Chinese character 'kou' and is connected to the upper end of the backrest support 14, the backrest surrounding frame 17 and the backrest support 14 are welded into a whole, and the whole is located on the same plane as the backrest support 14 outside the top transverse push rod area at the backrest surrounding frame 17; the armrest support 18 is rotatably coupled to the outer side surface of the back frame 17, and in particular, the armrest support 18 includes an elbow support plate 181 disposed in parallel above the seat support 15 and a coupling support plate 182 coupled to the rear end portion of the elbow support plate 181 and extending obliquely rearward and downward, the rear end portion of the coupling support plate 182 being rotatably coupled to the bottom of the outer side surface of the back frame 17.

Further, the foldable wheelchair further comprises a handrail support locking mechanism 40 for locking the opposite position of the handrail support 18 and the backrest surrounding frame 17, the handrail support locking mechanism 40 comprises a first locking hole 41 arranged on the outer side surface of the backrest surrounding frame 17, a second locking hole 42 arranged on the inner side surface of the connecting support plate 182, a locking ring 43 and locking teeth 44 connected to the outer wall of the locking ring 43, a first locking groove 45 is formed in the inner wall of the first locking hole 41, a second locking groove 46 is formed in the inner wall of the second locking hole 42, the first locking hole 41 and the second locking hole 42 are coaxially arranged with the rotating shaft of the connecting support plate 182, the first locking hole 41 and the second locking hole 42 are aligned and form a locking cavity 47, and the locking ring 43 can be axially and slidably arranged in the locking cavity 47; when the lock ring 43 is positioned in the first lock hole 41 and the second lock hole 42, the lock teeth 44 are engaged with the first lock groove 45 and the second lock groove 46, and the handrail bracket locking mechanism 40 is locked; when the locking ring 43 is positioned in the first locking hole 41 or the second locking hole 42, the locking teeth 43 are engaged with the first locking groove 45 or the second locking groove 46, and the armrest support locking mechanism 40 is unlocked.

To lock and unlock the armrest support locking mechanism 40, the armrest support locking mechanism 40 further includes a spring 48 and an unlocking button 49, the spring 48 is disposed in the first lock hole 41, two ends of the spring 48 respectively abut against the bottom wall of the first lock hole 41 and the inner side surface of the lock ring 43, and the spring 48 has a tendency to drive the lock ring 43 to slide outwards into the first lock hole 41 and the second lock hole 42, so that the armrest support locking mechanism 40 is locked; the unlocking button 49 comprises a round cover 491 and a pushing tooth 492, the round cover 491 is axially and slidably arranged in a containing hole 183 formed on the outer side surface of the connecting support plate 182, the containing hole 183 is coaxial with the second lock hole 42, the aperture of the containing hole 183 is smaller than that of the second lock hole 42, a penetrating groove which is used for communicating the containing hole 183 and the second lock hole 42 is formed in the connecting support plate 182, the pushing tooth 492 is connected to the end surface of an annular flange on the inner side of the round cover 491, the pushing tooth 492 is axially and slidably arranged on the connecting support plate 182 in a penetrating manner, the end part of the pushing tooth 492 stretches into the second lock hole 42 and contacts with the outer side surface of the lock ring 43, when the round cover 491 is pressed down, the lock ring 43 can be pushed to be separated from the second lock hole 42, after the external force is removed, the round cover 491 is reset under the action of the spring 48, and in this state, the outer end surface of the round cover 491 is flush with the outer side surface of the connecting support plate 182; to avoid rattling, further, the inner side of the locking ring 43 is provided with an annular groove 431 for receiving the outer end of the spring 48.

Further, the first locking groove 45 and the second locking groove 46 are three and uniformly distributed around the rotation axis of the connection support plate 182, the locking teeth 44 are arranged corresponding to the first locking groove 45 and the second locking groove 46, and the pushing teeth 492 are arranged corresponding to the locking teeth 44.

In the present embodiment, the wheel assembly includes a front wheel assembly 21 provided at the bottom of the front wheel bracket 11 and a rear wheel assembly 22 provided at the bottom of the rear wheel bracket 12 through a buffer mechanism 211, the foldable wheelchair further includes a power source 50 for supplying power to a driving motor 221 on the rear wheel assembly 22 and a controller 60 for controlling the driving motor 221 to rotate, the driving motor 221 is used for driving the rear wheel in the rear wheel assembly 22 to rotate, the power source 50 is provided on a U-shaped power source support plate 51 provided on the bottom link 16, and the controller 60 is provided at the front end portion of an elbow support plate 181 of the armrest bracket 18 to achieve electric driving.

In this embodiment, the front wheel support 11 includes a front wheel support frame 112 and front ear plates 113 connected to the top of the front wheel support frame 112, the front ear plates 113 are two and are disposed at intervals in the left-right direction, the front ear plates 113 are rotatably connected to the front end portion of the arc-shaped base 154 by the first rotation shaft 111, and the portion of the arc-shaped base 154 between the two front ear plates 113 extends forward and downward and is attached to the front side surface of the front wheel support frame 112, so as to form an abutting portion 157.

The advantage of this arrangement is that if the locking hook plate 31 is accidentally disengaged from the locking lever 32 after the user sits, the front wheel support 11 and the rear wheel support 12 are kept in the outwardly opened state due to the gravity of the user, and the wheelchair frame 10 is not folded, and at the same time, the degree of the outwardly opening of the front wheel support 11 and the rear wheel support 12 can be controlled due to the abutting portion 157 abutting against the front wheel support outer frame 112, so that the sitting collapse is avoided, and the safety is better.

In this embodiment, the first rotation axis 111 and the second rotation axis 121 are parallel to each other and form a virtual plane, the virtual plane is parallel to the plane of the seat support frame 151, the distance between the virtual plane and the plane of the seat support frame 151 is very important, if the distance is too large, the arm of force exerted on the abutting portion 157 by the gravity of the user will be lengthened, so that the torque applied to the abutting portion 157 will be increased, the abutting portion 157 will need to be thicker to achieve the same effect, and if the distance is too small, the front wheel support 11 and the rear wheel support 12 will be longer, and the space occupied after folding will be increased; meanwhile, the distance between the axis of the first rotating shaft 111 and the axis of the second rotating shaft 121 is also very important, if the distance is too large, the supporting span of the front wheel bracket 11 and the rear wheel bracket 12 is larger, the front wheel bracket 11 and the rear wheel bracket 12 which are thicker are required to have the same supporting force, and if the distance is too small, the front wheel bracket 11 and the rear wheel bracket 12 are longer, so that the occupied space after folding is increased; thus, in the present embodiment, the distance between the virtual plane and the plane of the seat frame 151 is 60% of the thickness of the seat frame 151 in the up-down direction, and the distance between the axis of the first rotation shaft 111 and the axis of the second rotation shaft 121 is 32% of the length of the bottom link 16.

In this embodiment, the front wheel bracket 11 further includes a front cross member 114 connected within the front wheel bracket outer frame 112, and a middle portion of the front cross member 114 is rotatably connected to an upper end portion of the pedal bracket 70.

In this embodiment, the rear wheel support 12 includes a rear wheel support frame 122 and a rear ear plate 123 connected to the top of the rear wheel support frame 122, the rear ear plates 123 are two and are disposed at intervals in the left-right direction, the rear ear plate 123 is rotatably connected to the rear end of the arc-shaped base 154 through a second rotation shaft 121, and the rear wheel support 12 further includes a bottom cross member 124 connected to the rear wheel support frame 122.

In this embodiment, a clamping groove 155 for clamping the middle beam is formed in the top of the arc-shaped base 154, a notch of the clamping groove 155 is welded to the side wall of the middle beam 152, and further, a plurality of weight reducing grooves 156 penetrating the arc-shaped base 154 in the left-right direction are further formed in the arc-shaped base 154.

The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the present invention and to implement the same, but are not intended to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention. .

Claims (20)

1. The utility model provides a collapsible wheelchair, includes collapsible wheelchair frame, sets up the wheel subassembly of wheelchair frame bottom, the wheelchair frame includes front wheel support, rear wheel support, keysets, back support, seat support and bottom connecting rod, its characterized in that:

the upper end part of the front wheel bracket is rotationally connected with the bottom of the seat bracket through a first rotating shaft, and the middle part of the front wheel bracket is rotationally connected with the front end part of the bottom connecting rod;

the upper end part of the rear wheel bracket is rotationally connected with the bottom of the seat bracket through a second rotating shaft positioned behind the first rotating shaft;

the adapter plate is positioned between the rear wheel bracket and the backrest bracket, the upper end part of the adapter plate is rotationally connected with the middle part of the backrest bracket, and the lower end part of the adapter plate is rotationally connected with the middle part of the rear wheel bracket;

the lower end part of the backrest bracket is rotationally connected with the rear end part of the bottom connecting rod;

the front wheel support, the seat support, the backrest support and the bottom connecting rod form a first four-bar linkage mechanism, the rear wheel support, the seat support, the backrest support and the adapter plate form a second four-bar linkage mechanism, and when the backrest support rotates relative to the seat support, the wheelchair frame can be changed between an unfolding state and a folding state by driving the first four-bar linkage mechanism and the second four-bar linkage mechanism to act.

2. The collapsible wheelchair of claim 1 wherein: the foldable wheelchair further comprises a wheelchair frame locking mechanism for locking the wheelchair frame in an unfolded state, wherein the wheelchair frame locking mechanism comprises a locking hook plate rotatably connected to the rear end part of the seat support and a locking rod connected to the backrest support, and when the locking hook plate hooks the locking rod, the relative positions of the backrest support and the seat support are kept locked.

3. The collapsible wheelchair of claim 2 wherein: the locking hook plate is provided with at least one hook tooth, and the hook tooth is positioned behind the locking rod when the locking hook plate hooks the locking rod.

4. The collapsible wheelchair of claim 2 wherein: the wheelchair frame locking mechanism further comprises a torsion spring, the torsion spring is sleeved on the rotating shaft of the locking hook plate, two ends of the torsion spring respectively abut against the seat support and the locking hook plate, and the torsion spring has a tendency of driving the locking hook plate to rotate in the direction of hooking the locking rod.

5. The collapsible wheelchair of claim 1 wherein: the middle part of the adapter plate is bent, so that an included angle is formed between the upper end part of the adapter plate and the lower end part of the adapter plate, the included angle is an obtuse angle, when the wheelchair frame is in an unfolding state, the projection of the upper end part of the connecting plate in the left-right direction is positioned in the projection area of the backrest bracket in the left-right direction, and the projection of the lower end part of the connecting plate in the left-right direction is positioned in the projection area of the rear wheel bracket in the left-right direction.

6. The collapsible wheelchair of claim 1 wherein: the wheelchair frame also comprises a backrest surrounding frame and an armrest support, wherein the backrest surrounding frame is shaped like a Chinese character 'kou' and is connected with the upper end part of the backrest support, and the armrest support is rotatably connected with the outer side surface of the backrest surrounding frame.

7. The collapsible wheelchair of claim 6 wherein: the armrest support comprises elbow support plates which are arranged above the seat support in parallel and connecting support plates which are connected with the rear end parts of the elbow support plates and extend in a backward and downward inclined mode, and the rear end parts of the connecting support plates are rotatably connected with the bottom of the outer side face of the backrest surrounding frame.

8. The collapsible wheelchair of claim 7 wherein: the foldable wheelchair further comprises a handrail support locking mechanism for locking the opposite positions of the handrail support and the backrest surrounding frame, the handrail support locking mechanism comprises a first lock hole arranged on the outer side surface of the backrest surrounding frame, a second lock hole arranged on the inner side of the connecting support plate, a lock ring and lock teeth connected with the outer wall of the lock ring, a first lock groove is formed in the inner wall of the first lock hole, a second lock groove is formed in the inner wall of the second lock hole, the first lock hole, the second lock hole and a rotating shaft of the connecting support plate are coaxially arranged, the first lock hole and the second lock hole are aligned and form a lock cavity, and the lock ring can be axially and slidably arranged in the lock cavity;

when the lock ring is positioned in the first lock hole and the second lock hole, the lock teeth are meshed with the first lock groove and the second lock groove, and the handrail bracket locking mechanism is locked; when the lock ring is positioned in the first lock hole or the second lock hole, the lock teeth are meshed with the first lock groove or the second lock groove, and the handrail support locking mechanism is unlocked.

9. The collapsible wheelchair of claim 8 wherein: the handrail support locking mechanism further comprises a spring and an unlocking button, the spring is arranged in the first lock hole, two ends of the spring respectively abut against the bottom wall of the first lock hole and the inner side face of the lock ring, and the spring has a trend of driving the lock ring to slide outwards into the first lock hole and the second lock hole;

the unlocking button comprises a round cover and pushing teeth, the round cover is arranged on the outer side face of the connecting support plate, the pushing teeth are connected to the end face of the annular flange on the inner side of the round cover, the pushing teeth can axially slide to penetrate through the connecting support plate, the end portions of the pushing teeth extend into the second lock holes and are in contact with the outer side face of the lock ring, and when the round cover is pressed down, the lock ring can be pushed to be separated from the second lock holes.

10. The collapsible wheelchair of claim 9 wherein: the inner side of the locking ring is provided with an annular groove for accommodating the outer end of the spring.

11. The collapsible wheelchair of claim 9 wherein: the first locking grooves and the second locking grooves are all multiple and uniformly distributed around the rotating shaft of the connecting support plate, the locking teeth are correspondingly arranged with the first locking grooves and the second locking grooves, and the pushing teeth are correspondingly arranged with the locking teeth.

12. The collapsible wheelchair of claim 6 wherein: the foldable wheelchair further comprises a power supply for supplying power to the driving motor on the wheel assembly and a controller for controlling the driving motor to rotate, wherein the power supply is arranged on a U-shaped power supply support plate arranged on the bottom connecting rod, and the controller is arranged at the front end part of the handrail support.

13. The collapsible wheelchair of claim 1 wherein: the seat support comprises a seat support outer frame, a middle cross beam and a rear cross beam which are connected in the seat support outer frame, and an arc-shaped base which is clamped at the bottom of the middle cross beam and extends towards two sides in an arc mode, the front end of the arc-shaped base is rotatably connected with the upper end of the front wheel support through a first rotating shaft, and the rear end of the arc-shaped base is rotatably connected with the upper end of the rear wheel support through a second rotating shaft.

14. The collapsible wheelchair of claim 13 wherein: the front wheel support comprises a front wheel support outer frame and front lug plates connected to the top of the front wheel support outer frame, the front lug plates are arranged in two and left and right directions at intervals, the front lug plates are rotationally connected with the arc-shaped base through first rotating shafts, and the portions, located between the front lug plates, of the arc-shaped base extend forwards and downwards and are attached to the front side face of the front wheel support outer frame.

15. The collapsible wheelchair of claim 14 wherein: the front wheel support further comprises a front cross beam connected in the outer frame of the front wheel support, and the middle of the front cross beam is rotationally connected with the upper end of the pedal support.

16. The collapsible wheelchair of claim 13 wherein: the rear wheel support comprises a rear wheel support outer frame and rear lug plates connected to the top of the rear wheel support outer frame, two rear lug plates are arranged at intervals along the left-right direction, and the rear lug plates are connected with the arc-shaped base in a rotating mode through a second rotating shaft.

17. The collapsible wheelchair of claim 12 wherein: the first rotating shaft is parallel to the second rotating shaft and forms a virtual plane, and the virtual plane is parallel to the plane where the outer frame of the seat support is located.

18. The collapsible wheelchair of claim 17 wherein: the distance between the axis of the first rotating shaft and the axis of the second rotating shaft is 30% -35% of the length of the bottom connecting rod, and the distance between the virtual plane and the plane of the outer frame of the seat support is 50% -70% of the thickness of the outer frame of the seat support in the up-down direction.

19. The collapsible wheelchair of claim 13 wherein: the top of arc base is equipped with and is used for the joint groove of middle part crossbeam, the notch in joint groove with the lateral wall welded connection of middle part crossbeam.

20. The collapsible wheelchair of claim 13 wherein: the arc-shaped base is provided with a plurality of weight reducing grooves penetrating through the arc-shaped base along the left-right direction.