阅读说明：本技术 一种可折叠轮椅 (Foldable wheelchair ) 是由 吴焘 陈向阳 于 2021-01-22 设计创作，主要内容包括：本发明提供的可折叠轮椅,包括轮椅架等部件,轮椅架包括前部沿水平方向延伸后部向后下方倾斜延伸的座位支架、上端部与座位支架前端部相转动连接的前轮支架、中部与座位支架后端部相转动连接的后轮支架、连接杆、下端部与后轮支架上端部相转动连接的靠背支架、扶手支架,通过使连接杆的两端部分别与前轮支架和后轮支架相转动连接,使扶手支架的两端部分别与座位支架和靠背支架相转动连接,使得座位支架、前轮支架、后轮支架和连接杆构成第一四连杆机构,使得座位支架、后轮支架、靠背支架和扶手支架构成第二四连杆机构,这两个四连杆机构共用后轮支架和座位支架,只需控制其中一个即可实现轮椅架的锁定和解锁,构思巧妙、结构简单、操作方便。(The invention provides a foldable wheelchair, which comprises a wheelchair frame and other parts, wherein the wheelchair frame comprises a seat support, a front wheel support, a rear wheel support, a connecting rod, a backrest support and an armrest support, the front part of the seat support extends along the horizontal direction, the rear part of the seat support extends backwards and downwards in an inclined manner, the upper end part of the front wheel support is rotatably connected with the front end part of the seat support, the middle part of the rear wheel support is rotatably connected with the rear end part of the seat support, the connecting rod is rotatably connected with the upper end part of the rear wheel support, the lower end part of the armrest support is rotatably connected with the seat support and the backrest support respectively, the seat support, the front wheel support, the rear wheel support and the connecting rod form a first four-bar mechanism, the seat support, the rear wheel support, the backrest support and the armrest support form a second four-bar mechanism, the two four-bar mechanisms share the rear wheel support and the seat support, the locking and unlocking of the wheelchair frame can be realized by controlling one of the two parts, and the wheelchair frame has the advantages of ingenious design, simple structure and convenient operation.)

1. A foldable wheelchair including a wheelchair frame having unfolded and folded positions, a wheel assembly located at the bottom of the wheelchair frame, a drive assembly for driving the wheel assembly to rotate, and a wheelchair frame locking mechanism for locking the wheelchair frame in the unfolded position, the wheelchair frame comprising:

a seat support, the front part of which extends along the horizontal direction, and the rear part of which extends obliquely backwards and downwards;

the upper end part of the front wheel bracket is rotationally connected with the front end part of the seat bracket;

the middle part of the rear wheel bracket is rotationally connected with the rear end part of the seat bracket;

a connecting rod extending obliquely from a front lower direction to a rear upper direction, a front end portion of the connecting rod being rotatably connected to a lower end portion of the front wheel bracket, and a rear end portion of the connecting rod being rotatably connected to an upper end portion of the rear wheel bracket, so that the seat bracket, the front wheel bracket, the rear wheel bracket, and the connecting rod constitute a first four-bar linkage;

the lower end part of the backrest bracket is rotatably connected with the upper end part of the rear wheel bracket;

the front part of the armrest support extends obliquely towards the front lower part, the rear part of the armrest support extends along the horizontal direction, the front end part of the armrest support is rotatably connected with the front end part of the seat support, and the rear end part of the armrest support is rotatably connected with the middle part of the backrest support, so that the seat support, the rear wheel support, the backrest support and the armrest support form a second four-bar linkage mechanism.

2. The foldable wheelchair as recited in claim 1, wherein: the front end of the armrest support, the upper end of the front wheel support and the front end of the seat support share a first rotating shaft, and the lower end of the backrest support, the upper end of the rear wheel support and the rear end of the connecting rod share a second rotating shaft.

3. The foldable wheelchair as recited in claim 2, wherein: the wheelchair frame locking mechanism enables the wheelchair frame to be locked in the unfolded state by locking the relative positions of the connecting rod and the rear wheel support, and comprises an unlocking handle which is rotatably connected to the upper end part of the rear wheel support through the second rotating shaft.

4. The foldable wheelchair as recited in claim 1, wherein: the handrail support is provided with a height-adjustable handrail, the handrail comprises a handrail plate and a supporting plate, the handrail plate is parallel to the rear portion of the handrail support, the upper end portion of the supporting plate is connected to the bottom of the handrail plate, the lower end portion of the supporting plate is slidably arranged in a mounting hole in the front portion of the handrail support in a penetrating mode, and the extending direction of the supporting plate coincides with the extending direction of the front portion of the handrail support.

5. The foldable wheelchair as recited in claim 4, wherein: the armrest support is also provided with an armrest locking mechanism for locking the height of the armrest, the armrest locking mechanism is a one-way locking mechanism, and when the armrest locking mechanism is in a locking state, the support plate can slide forwards and downwards and cannot slide backwards and upwards, or the support plate can slide backwards and upwards and cannot slide forwards and downwards; when the armrest locking mechanism is in the unlocked state, the support plate can slide both forward and downward and rearward and upward.

6. The foldable wheelchair as recited in claim 4, wherein: the armrest locking mechanism comprises a locking piece, locking grooves and a spring, wherein the locking piece is horizontally and slidably arranged at the rear part of the armrest support, one part of the locking piece protrudes downwards from the bottom surface of the armrest support to form a handle part, the locking grooves are formed in the rear surface of the support plate and are at least two, the two locking grooves are arranged at intervals along the extending direction of the support plate, the locking piece is provided with a first working position and a second working position, when the locking piece is arranged at the first working position, the front end part of the locking piece extends into the mounting hole and is inserted into the locking grooves, so that the armrest locking mechanism is locked, when the locking piece is arranged at the second working position, the locking piece is separated from the locking grooves, so that the armrest locking mechanism is unlocked, and the spring is arranged at the rear part of the armrest support, the spring has a tendency to urge the locking member to slide towards the first operating position.

7. The foldable wheelchair as recited in claim 6, wherein: the front end portion of locking piece has first inclined plane, contained angle between first inclined plane and the horizontal plane is the acute angle, be provided with on the inner wall of locking groove with first inclined plane assorted second inclined plane when the locking piece is in first operating position, first inclined plane with the second inclined plane is laminated mutually.

8. The foldable wheelchair as recited in claim 7, wherein: the drive assembly comprises a motor, a battery and a controller, the motor is arranged on the wheel assembly and used for driving the wheel assembly to rotate, the battery is arranged under a seat plate arranged at the front part of the seat support, the battery is used for providing power for the motor, the controller is used for controlling the rotation of the motor, and the controller is arranged at the front end part of the armrest plate.

9. The foldable wheelchair as recited in claim 8, wherein: the first inclined plane and the second inclined plane are both provided with electrodes, the electrodes are connected in series on a control circuit of the controller, when the first inclined plane and the second inclined plane are attached to each other, the electrodes are conducted on the control circuit, and the controller can control the motor to rotate.

10. The foldable wheelchair as recited in any one of claims 1-9, wherein: the included angle between the extending direction of the front part of the handrail support and the horizontal direction is 50-70 degrees.

Technical Field

The invention belongs to the field of medical instruments, and particularly relates to a foldable wheelchair.

Background

In the process of treating and recovering patients, particularly for patients who cannot walk independently, the wheelchair mode is usually adopted to replace walking, so that the patients can be treated and recovered well, and the daily life of the patients is facilitated.

Most of the existing wheelchairs are not foldable and inconvenient to store, and although some wheelchairs are also partially foldable, most of the wheelchairs are complex in structure, so that the control mode of a locking mechanism is also complex, and the wheelchairs are inconvenient to fold and unfold.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a foldable wheelchair which is ingenious in conception, simple in structure and convenient to operate.

In order to achieve the above object, the present invention adopts a technical solution that a foldable wheelchair includes a wheelchair frame having an unfolded and folded state, a wheel assembly located at a bottom of the wheelchair frame, a driving assembly for driving the wheel assembly to rotate, and a wheelchair frame locking mechanism for locking the wheelchair frame in the unfolded state, the wheelchair frame including:

a seat support, the front part of which extends along the horizontal direction, and the rear part of which extends obliquely backwards and downwards;

the upper end part of the front wheel bracket is rotationally connected with the front end part of the seat bracket;

the middle part of the rear wheel bracket is rotationally connected with the rear end part of the seat bracket;

a connecting rod extending obliquely from a front lower direction to a rear upper direction, a front end portion of the connecting rod being rotatably connected to a lower end portion of the front wheel bracket, and a rear end portion of the connecting rod being rotatably connected to an upper end portion of the rear wheel bracket, so that the seat bracket, the front wheel bracket, the rear wheel bracket, and the connecting rod constitute a first four-bar linkage;

the lower end part of the backrest bracket is rotatably connected with the upper end part of the rear wheel bracket;

the front part of the armrest support extends obliquely towards the front lower part, the rear part of the armrest support extends along the horizontal direction, the front end part of the armrest support is rotatably connected with the front end part of the seat support, and the rear end part of the armrest support is rotatably connected with the middle part of the backrest support, so that the seat support, the rear wheel support, the backrest support and the armrest support form a second four-bar linkage mechanism.

Preferably, the front end portion of the armrest support, the upper end portion of the front wheel support, and the front end portion of the seat support share a first rotation axis, and the lower end portion of the backrest support, the upper end portion of the rear wheel support, and the rear end portion of the connecting rod share a second rotation axis, so that the wheelchair frame is more compact in structure and more highly-appreciated.

Further preferably, wheelchair frame locking mechanical system is through the locking the connecting rod with the relative position of rear wheel support makes the wheelchair frame locking is in the state of expanding, wheelchair frame locking mechanical system is including the unblock handle, the unblock handle passes through the second axis of rotation is rotationally connected the upper end of rear wheel support, sets up like this and makes wheelchair frame locking mechanical system's unblock handle be located the intermediate position at this collapsible wheelchair rear portion, and unblock handle adopts the mode of rotatory unblock, and difficult spurious triggering, and the security is better.

Preferably, be provided with height-adjustable's handrail on the handrail support, the handrail includes handrail board and backup pad, handrail board with the rear portion of handrail support parallels, the upper end of backup pad is connected the bottom of handrail board, wear to establish to be located under the lower tip slidable of backup pad in the mounting hole of the front portion of handrail support, the extending direction of backup pad with the extending direction of the front portion of handrail support coincides mutually, sets up the hand elbow that can bear the user like this to adapt to the user of different heights, thereby promote this collapsible wheelchair's commonality and riding comfort.

Further preferably, the armrest support is further provided with an armrest locking mechanism for locking the height of the armrest, the armrest locking mechanism is a one-way locking mechanism, and when the armrest locking mechanism is in a locked state, the support plate can slide forward and downward and cannot slide backward and upward, or the support plate can slide backward and upward and cannot slide forward and downward; when handrail locking mechanical system is in the unblock state, the backup pad can slide to the front below and can slide to the back top again, sets up like this and can make things convenient for user's operation, and has very strong senior sense.

Further preferably, the armrest locking mechanism includes a locking member horizontally slidably disposed at a rear portion of the armrest support, a portion of the locking member protruding downward from a bottom surface of the armrest support to form a grip portion, a locking groove opened at a rear surface of the support plate, at least two locking grooves disposed at intervals in an extending direction of the support plate, the locking member having a first operating position and a second operating position, a front end portion of the locking member extending into the mounting hole and being inserted into the locking groove to lock the armrest locking mechanism, and a spring disposed at the rear portion of the armrest support, the locking member being disengaged from the locking groove to unlock the armrest locking mechanism when the locking member is in the second operating position, the spring has and orders about the locking piece to the gliding trend of first operating position, the benefit that sets up like this lies in for the adjusting part of all handrail board heights all sets up in the mounting hole, and the reliability is high, long service life, and difficult the clamp injures the user, and the security is better.

Further preferably, the front end portion of the locking piece has a first inclined plane, an included angle between the first inclined plane and the horizontal plane is an acute angle, the inner wall of the locking groove is provided with a second inclined plane matched with the first inclined plane, when the locking piece is located at the first working position, the first inclined plane and the second inclined plane are attached to each other.

Further preferably, the drive assembly includes a motor, a battery and a controller, the motor is arranged on the wheel assembly for driving the wheel assembly to rotate, the battery is arranged under a seat plate erected at the front part of the seat support, the battery is used for providing power for the motor, the controller is used for controlling the rotation of the motor, and the controller is arranged at the front end part of the armrest plate.

Further preferably, first inclined plane with all be provided with the electrode on the second inclined plane, the electrode is established ties on the control circuit of controller first inclined plane with when the second inclined plane was laminated mutually, the electrode switches on control circuit, the controller can be controlled the motor rotates, sets up like this and can avoid the user to bump the potential safety hazard that the controller caused by the mistake when adjusting handrail board height, and has very strong senior sense.

Further preferably, the angle between the extending direction of the front part of the armrest support and the horizontal direction is 50-70 °.

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 comprising: the wheelchair frame that has expansion and folded state, be located the wheel subassembly of wheelchair frame bottom, be used for driving the rotatory drive assembly of wheel subassembly, be used for with the wheelchair frame locking mechanical system of wheelchair frame locking in the expansion state, the wheelchair frame includes: the front part of the wheelchair frame extends along the horizontal direction, the rear part of the wheelchair frame extends obliquely towards the rear lower part, the front wheel bracket, the middle part of the wheelchair frame is rotatably connected with the front end part of the seat bracket, the rear wheel bracket, the middle part of the wheelchair frame is rotatably connected with the rear end part of the seat bracket, the connecting rod, the backrest bracket, the lower end part of the wheelchair frame is rotatably connected with the upper end part of the rear wheel bracket, the armrest bracket and the seat bracket, the front wheel bracket, the rear wheel bracket and the connecting rod form a first four-bar mechanism, the seat bracket, the rear wheel bracket, the backrest bracket and the armrest bracket form a second four-bar mechanism, the two four-bar mechanisms share the rear wheel bracket and the seat bracket, and the locking and unlocking of the wheelchair frame can be realized only by controlling one of the two four-bar mechanisms, ingenious design, simple structure and convenient operation.

Drawings

Fig. 1 is a schematic perspective view of a preferred embodiment of the present invention.

Figure 2 is a side view of figure 1 with the wheelchair frame in a deployed condition.

Fig. 3 and 4 are side views of fig. 1, in which the wheelchair frame is in the process of being transformed from the unfolded state to the folded state.

Figure 5 is a side view of figure 1 with the wheelchair frame in a folded condition.

Fig. 6 is an enlarged schematic view, partially in section, of the armrest assembly of fig. 2.

Wherein: 10. a wheelchair frame; 11. a seat support; 111. a seat; 12. a front wheel bracket; 13. a rear wheel support; 14. a connecting rod; 15. a backrest support; 16. a handrail support; 161. a handrail plate; 162. a support plate; 163. mounting holes; 164. an armrest locking mechanism; 1641. a locking member; 1641a. handle part; 1641b. a first inclined plane; 1642. a locking groove; 1642a, connecting groove; 1642b. a second inclined plane; 1643. a spring; 17. a foot pedal; 18. a first rotating shaft; 19. a second rotating shaft; 21. a front wheel assembly; 22. a rear wheel assembly; 31. a motor; 32. a battery; 33. a controller; 40. a wheelchair frame locking mechanism; 41. the handle is unlocked.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.

The front-rear direction, the left-right direction, and the up-down direction described in the present invention are based on the front-rear direction, the left-right direction, and the up-down direction as viewed by an occupant when riding the foldable wheelchair provided by the present invention, and specifically, the up-down direction described in the present invention refers to the up-down direction in fig. 2, the front-rear direction described in the present invention refers to the left-right direction in fig. 2, and the left-right direction described in the present invention refers to the inside-outside direction in fig. 2.

The invention will be further described with reference to examples of embodiments shown in the drawings to which the invention is attached.

As shown in fig. 1 to 6, the present invention provides a foldable wheelchair including a wheelchair frame 10 having an unfolded and folded state, a wheel assembly at the bottom of the wheelchair frame 10, a driving assembly for driving the wheel assembly to rotate, and a wheelchair frame locking mechanism 40 for locking the wheelchair frame 10 in the unfolded state, the wheelchair frame 10 including: a seat support 11, a front wheel support 12, a rear wheel support 13, a connecting rod 14, a backrest support 15, an armrest support 16 and a footrest 17, wherein the front of the seat support 11 extends in the horizontal direction, and the rear of the seat support 11 extends obliquely downward and rearward; the upper end part of the front wheel bracket 12 is rotationally connected with the front end part of the seat bracket 11; the middle part of the rear wheel bracket 13 is rotationally connected with the rear end part of the seat bracket 11; the connecting rod 14 extends obliquely from the front lower part to the rear upper part, the front end part of the connecting rod 14 is rotatably connected with the lower end part of the front wheel bracket 12, and the rear end part of the connecting rod 14 is rotatably connected with the upper end part of the rear wheel bracket 13, so that the seat bracket 11, the front wheel bracket 12, the rear wheel bracket 13 and the connecting rod 14 form a first four-bar linkage; the lower end part of the backrest bracket 15 is rotationally connected with the upper end part of the rear wheel bracket 13; the front part of the armrest support 16 extends obliquely forwards and downwards, the rear part of the armrest support 16 extends along the horizontal direction, the front end part of the armrest support 16 is rotatably connected with the front end part of the seat support 11, and the rear end part of the armrest support 16 is rotatably connected with the middle part of the backrest support 15, so that the seat support 11, the rear wheel support 13, the backrest support 15 and the armrest support 16 form a second four-bar linkage; the two four-bar linkage mechanisms share the rear wheel bracket 13 and the seat bracket 11, and the locking and unlocking of the wheel chair frame 10 can be realized by only controlling one of the four-bar linkage mechanisms, so that the design is ingenious, the structure is simple, and the operation is convenient.

The front end of the armrest support 16, the upper end of the front wheel support 12, and the front end of the seat support 11 share the first pivot shaft 18, and the lower end of the backrest support 15, the upper end of the rear wheel support 13, and the rear end of the connecting rod 14 share the second pivot shaft 19, so that the wheelchair frame 10 is more compact in structure and more highly-sophisticated.

In this embodiment, the wheelchair frame locking mechanism 40 locks the wheelchair frame 10 in the unfolded state by locking the relative positions of the connecting rod 14 and the rear wheel bracket 13, the wheelchair frame locking mechanism 40 includes an unlocking handle 41, the unlocking handle 41 is rotatably connected to the upper end portion of the rear wheel bracket 13 through the second rotating shaft 19, when the unlocking handle 41 rotates relative to the rear wheel bracket 13, the wheelchair frame locking mechanism 40 can be changed to the unlocked state, so that the wheelchair frame 10 can be folded, the unlocking handle 41 of the wheelchair frame locking mechanism 40 is located at the middle position of the rear portion of the foldable wheelchair, and the unlocking handle 41 adopts a rotary unlocking mode, so that the wheelchair frame is not easy to be triggered by mistake, and the safety is better.

The armrest support 16 is provided with an armrest with adjustable height, the armrest comprises an armrest plate 161 and a support plate 162, the armrest plate 161 is parallel to the rear part of the armrest support 16, the upper end part of the support plate 162 is connected to the bottom of the armrest plate 161, the lower end part of the support plate 162 is slidably arranged in a mounting hole 163 arranged in the front part of the armrest support 16 in a penetrating manner, the extending direction of the support plate 162 is coincident with the extending direction of the front part of the armrest support 16, and the armrest support is arranged to support the elbow of a user and adapt to users with different heights, so that the universality and the riding comfort of the foldable wheelchair are improved.

The armrest support 16 is further provided with an armrest locking mechanism 164 for locking the height of the armrest, and the armrest locking mechanism 164 is a one-way locking mechanism, in which when the armrest locking mechanism 164 is in a locked state, the support plate 162 can slide back up and cannot slide back down; when the armrest locking mechanism 164 is in the unlocked state, the support plate 162 can slide both forward and downward and rearward and upward, which facilitates the operation of the user and provides a strong sense of sophistication.

Specifically, as shown in fig. 6, the armrest locking mechanism 164 includes a locking member 1641, two locking grooves 1642 and a spring 1643, the locking member 1641 is horizontally slidably disposed at the rear portion of the armrest support 16, a portion of the locking member 1641 protrudes downward from the bottom surface of the armrest support 16 to form a pull portion 1641a, the locking groove 1642 is open to the rear surface of the support plate 162, the two locking grooves 1642 are disposed at intervals along the extending direction of the support plate 162, the locking member 1641 has a first operating position and a second operating position, when the locking member 1641 is at the first operating position, the front end portion of the locking member 1641 extends into the mounting hole 163 and is inserted into the locking groove 1642 to lock the armrest locking mechanism 164, when the locking member 1641 is at the second operating position, the locking member 1641 is disengaged from the locking groove 1642 to unlock the armrest locking mechanism 164, the spring 1643 is disposed at the rear portion of the armrest support 16, the spring 1643 has a tendency to urge the locking member 1641 to slide toward the first operating position, the advantage that sets up like this for all handrail board height's adjusting part all sets up in mounting hole 163, does not expose, and the reliability is high, long service life, and difficult pressing from both sides hinder the user, and the security is better.

In this embodiment, a connecting groove 1642a is further provided between the two locking grooves 1642, and when the locking member 1641 is in the second operating position and moves the support plate 162 up and down, the front end portion of the locking member 1641 slides in the connecting groove without being separated from the mounting hole 163, so that the limit position of the support plate 162 can be defined, and the support plate 162 can be prevented from being separated from the mounting hole 163.

The front end portion of the locking piece 1641 is provided with a first inclined surface 1641b, an included angle between the first inclined surface 1641b and a horizontal plane is an acute angle, a second inclined surface 1642b matched with the first inclined surface 1641b is arranged on the inner wall of the locking piece 1642, when the locking piece 1641 is located at the first working position, the first inclined surface 1641b and the second inclined surface 1642b are attached to each other, at this time, the armrest plate 161 is pulled upwards to provide an upward moving force for the support plate 162, and the force, under the matching of the first inclined surface 1641b and the second inclined surface 1642b, decomposes the force pushing the locking piece 1641 to slide towards the second working position and the force pulling the support plate 162 upwards along the axial direction of the support plate 162, so that the locking piece 1641 is moved to the second working position, the armrest locking mechanism 164 is unlocked, and the armrest locking mechanism 164 has a function of unidirectional locking.

The wheel subassembly is including being located the front wheel subassembly 21 of front wheel support 12 bottom and the rear wheel subassembly 22 that is located rear wheel support 13 bottom, drive assembly includes motor 31, battery 32 and controller 33, motor 31 sets up and is used for driving rear wheel subassembly 22 to rotate on rear wheel subassembly 22, battery 32 is located and erects under the seat board 111 of seat support 11 front portion, battery 32 is used for providing electric power to motor 31, controller 33 is used for controlling the rotation of motor 31, controller 33 sets up the front end at handrail board 161, the benefit that sets up like this lies in, can reduce the focus of collapsible wheelchair, it is more stable when making it remove, it is more convenient when user's operation wheelchair removes that electric drive's mode can make.

In this embodiment, the first inclined plane 1641b and the second inclined plane 1642b are both provided with electrodes (not shown in the figure), the electrodes can be embedded by sheet or block metal, the electrodes are connected in series to the control circuit of the controller 33, when the first inclined plane 1641b and the second inclined plane 1642b are attached to each other, the electrodes turn on the control circuit, the controller 33 can control the motor 31 to rotate, so that the potential safety hazard caused by the fact that a user mistakenly touches the controller when the height of the armrest plate 161 is adjusted can be avoided, and the high-grade feeling is achieved.

The front part of the armrest support 16 and the support plate 162 extend obliquely forward and downward to drive the armrest plate 161 to move forward and backward to adapt to users with different sizes and different arm lengths when the height of the armrest plate 161 is adjusted, and the angle between the extending direction of the front part of the armrest support 16 and the support plate 162 and the horizontal direction is preferably 50-70 degrees, and in the embodiment, the angle is 63 degrees.

The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the invention, and not to limit the scope of the invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.