CN211460899U - Standing auxiliary wheelchair - Google Patents

Abstract

The utility model discloses an auxiliary wheelchair stands belongs to wheelchair technical field. The utility model discloses an auxiliary wheelchair stands, including frame, wheel, chair cushion and the back of the chair, the frame include back of the chair dead lever, dead lever connecting rod, chair cushion dead lever, handrail frame, wheel mounting bracket and drive mechanism, wherein back of the chair dead lever fixed mounting is in the both ends of dead lever connecting rod, handrail frame fixed mounting is on chair cushion dead lever, and chair cushion dead lever and wheel mounting bracket are fixed to link to each other, drive mechanism includes gear and driving rack, the gear is installed on the dead lever connecting rod, and the both ends of dead lever connecting rod are rotatable to be installed on the rear wheel installation pole of wheel mounting bracket, driving rack links to each other with the fixed phase of chair cushion rear end and meshes with the gear mutually. Adopt the technical scheme of the utility model convenient to use person stands from the wheelchair, and easy operation, it only need simple back to move make the chair cushion slope certain angle can.

Description

A standing assist wheelchair

technical field

The utility model belongs to the technical field of wheelchairs, and more particularly relates to a standing assist wheelchair.

Background technique

Now the world has gradually entered an aging society. Due to the deterioration of physical functions, the elderly are gradually inferior to others in action and physical strength; and the incidence of cardiovascular and cerebrovascular diseases in my country is increasing year by year, and stroke and hemiplegia due to cardiovascular and cerebrovascular diseases are also increasing. and many physical disabilities due to accidents or congenital reasons, and the demand for wheelchairs for this group of people is increasing day by day. People with leg disabilities, stroke patients or the elderly often need to use wheelchairs to walk because of their inability to use their feet to stand on their own.

However, people with leg disabilities, stroke patients or the elderly are extremely likely to feel uncomfortable when they stay in a wheelchair for a long time after sitting in a wheelchair. Although the wheelchairs on the market are versatile and practical, most of them only consider the diversity of functions and not other issues. Therefore, when people who are inconvenient to walk stand up from the wheelchair, in most cases, they need the help of others to stand up again. Walking with crutches can cause great inconvenience and distress to those who are inconvenient to stand and their caregivers. At the same time, it is difficult to sit up directly from the wheelchair due to the obstruction of the wheelchair armrest or other places when being supported by others.

After searching, relevant patents have been published on wheelchairs that are convenient for users to stand up. For example, the Chinese patent application No. 201510189562.X discloses a standing seat for the elderly. The seat cushion and the base of the seat form a rotating pair, and a lifting rod is connected under the seat cushion. The thrust of the lifting rod Under the action, the seat cushion rotates around the base, thereby realizing the function of assisting standing. The application does not specify the number and installation positions of the lift rods. If the lift rods are installed on one side of the seat cushion, the uneven force will cause the seat cushion to deform, and the seat cushion will rise first on one side and then rise on the other side. If the lift rods are installed on both sides of the seat cushion, it is difficult to keep the two lift rods in sync.

For another example, the Chinese patent application No. 201720038893.8 discloses a fully automatic wheelchair, which can realize electric control and stand at the same time. However, these assisted standing devices are all electric, and the cost is relatively high, and there are few on the market that can assist themselves to stand up through simple and capable actions for the physically inconvenient.

Utility model content

1. The problem to be solved

Aiming at the problem that the existing wheelchair is inconvenient for the user to stand up, the present utility model provides a standing assist wheelchair. The technical solution of the present utility model is used to facilitate the user to stand up from the wheelchair, and the operation is simple, and it only needs to lean back. The action can make the seat cushion tilt at a certain angle.

2. Technical solutions

In order to solve the above-mentioned problems, the technical scheme adopted by the present utility model is as follows:

A standing assist wheelchair of the utility model comprises a frame, a wheel, a seat cushion and a seat back. The frame includes a seat back fixing rod, a fixing rod connecting rod, a seat cushion fixing rod, an armrest frame, a wheel mounting frame and A transmission mechanism, wherein the seat back fixing rod is fixedly installed on both ends of the connecting rod of the fixing rod, the armrest frame is fixedly installed on the seat cushion fixing rod, and the seat cushion fixing rod is fixedly connected with the wheel mounting frame, and the transmission mechanism includes a gear and a transmission Rack, the gear is installed on the connecting rod of the fixed rod, the two ends of the connecting rod of the fixed rod can be rotatably installed on the rear wheel mounting rod of the wheel mounting frame, the transmission rack is fixedly connected with the rear end of the seat cushion and is connected with the gear meshed.

Furthermore, both sides of the seat cushion are supported and mounted on the seat cushion fixing rod through a row of support hinges, and the length of the support hinges is gradually shortened along the direction away from the seat back.

Further, it also includes a locking reset mechanism, the locking reset mechanism includes a control rod, two different sides of the control rod are respectively provided with movable ratchet teeth and fixed ratchet teeth, the fixed ratchet teeth are fixedly installed on the control rod, and the movable ratchet teeth are installed on the control rod. The teeth can be rotatably mounted on the control rod up and down, and the transmission rack is correspondingly provided with fixed teeth matched with the movable ratchet teeth and the fixed ratchet teeth. To limit, through the cooperation of the fixed ratchet and the fixed teeth, the up and down movement of the transmission rack is limited.

Further, the lower surfaces of the movable ratchet teeth and the fixed ratchet teeth are both arc-shaped structures, and the upper surfaces thereof are both planar structures, and a return spring is provided between the upper surface of the movable ratchet teeth and the control rod.

Further, the top of the transmission rack is connected with an annular cylinder through a connecting rod, the annular cylinder is located in the armrest fixing cylinder close to the seat back, and the side wall of the armrest fixing cylinder is processed with a connecting rod for passing through and moving up and down. A chute; the control rod is rotatably installed in the above-mentioned handrail fixing cylinder and passes through an annular cylinder, and the fixing teeth are arranged on the inner wall of the annular cylinder.

Furthermore, the fixing rod connecting rod is installed in the angle adjustment sleeve, the angle adjustment sleeve is processed with a limit groove for the seat back fixing rod to pass through, and a seat back fixing rod and the angle adjustment sleeve are arranged between the seat back fixing rod and the angle adjustment sleeve. There is a first return spring.

Furthermore, a first fixing cylinder and a second fixing cylinder concentrically arranged are fixed on the rear wheel mounting rod, the two ends of the connecting rod of the fixing rod are rotatably installed in the second fixing cylinder, and the angle adjustment sleeve is rotatable. The two ends are correspondingly installed between the first fixing cylinder and the second fixing cylinder; the gear is installed outside the first fixing cylinder, and the fixing rod connecting rod is provided with a first stopper on the outer sides of the two seatback fixing rods. The inner wall of the gear is provided with a second stopper matched with the first stopper, and a circular arc groove for the second stopper to pass through and rotate is processed on the first fixing cylinder.

Further, the first fixed cylinder is processed into a stepped structure composed of a first cylinder section and a second cylinder section, and the outer diameter of the first cylinder section is larger than the outer diameter of the second cylinder section and the inner diameter of the gear, so The gear is sleeved on the outside of the second cylinder section, and the second cylinder section is provided with a screw hole, and a limit bolt is installed in the screw hole.

Furthermore, both ends of the angle adjustment sleeve are machined with card grooves distributed along its circumferential direction, and the rear wheel mounting rod is installed with a locking piece matched with the locking groove. Cooperate with the locking and positioning of the angle adjustment sleeve.

Further, the locking member includes a limit ball, a spring, a spring stopper and a limit pin, the rear wheel mounting rod is machined with perforations distributed in the lateral direction, and one end of the limit pin passes through the hole and the limit pin. The position ball is fixedly connected, the diameter of the limit ball is larger than the inner diameter of the hole, the other end of the limit pin can be snapped and matched with the card slot, and the middle of the limit pin is provided with a spring stopper. There are springs, and both the spring and the spring retainer are located inside the perforations in the rear wheel mounting rod.

3. Beneficial effects

Compared with the prior art, the beneficial effects of the present utility model are:

(1) A standing assist wheelchair of the present utility model, the frame of which includes a seat back fixing rod, a fixing rod connecting rod, a seat cushion fixing rod, an armrest frame, a wheel mounting frame and a transmission mechanism, and the transmission mechanism includes a gear and a transmission mechanism. The rack and gear are installed on the fixing rod connecting rod. When the wheelchair user needs to stand up and leaning back on the seat back, the fixing rod connecting rod and the seat back fixing rod rotate relative to the rear wheel mounting rod, thereby driving the gear to rotate. , the rotation of the gear drives the transmission rack to move upward, thereby driving the rear end of the seat cushion to move upward, that is, the seat cushion tilts, and the wheelchair user can stand up with the help of the armrest or crutches, which solves the problem that the existing wheelchair is inconvenient to use. the question of standing up.

(2) In a standing assist wheelchair of the present invention, both sides of the seat cushion are supported and mounted on the seat cushion fixing rod through a row of support hinges, and the length of the support hinges is gradually shortened along the direction away from the seat back. The arrangement of the hinge can ensure that the seat cushion tilts forward when the driving rack moves upward, so it is convenient for the user to stand up, and at the same time, the firmness of the support during the lifting process of the seat cushion can be improved.

(3) A standing assist wheelchair of the present invention further includes a locking and resetting mechanism, and the transmission rack can be locked by the cooperation of the movable ratchet teeth and the fixed ratchet teeth on the locking and resetting mechanism and the fixed teeth on the transmission rack. Prevents the seat cushion from lowering during normal use, when the seat cushion is raised, and when the user is standing. When the wheelchair user stands up and sits down again, the locking of the drive rack by the locking and reset mechanism is released, and under the action of the user's gravity, the drive rack and the seat cushion can move downward to restore. In the utility model, the top of the transmission rack is connected with an annular cylinder through a connecting rod, and the annular cylinder is located in the armrest fixing cylinder close to the seat back. Therefore, the up and down movement of the transmission rack can be guided by the armrest fixing cylinder to ensure its movement. stability.

(4) In a standing assist wheelchair of the present invention, the fixing rod connecting rod is installed in the angle adjusting sleeve, and the rotation angle of the fixing rod connecting rod can be controlled through the setting of the angle adjusting sleeve. A first restoring spring is also arranged between the angle adjusting sleeve and the user, when the user stands up, the seat back can be automatically restored under the elastic force of the first restoring spring.

(5) In a standing assist wheelchair of the present invention, both ends of the angle adjustment sleeve are machined with card grooves distributed along the circumferential direction thereof, and the rear wheel mounting rod is installed with a locking piece matched with the card grooves , Since different users have different requirements for the inclination angle of the seatback, the rotation angle of the seatback fixing rod can be adjusted by adjusting the position of the angle adjustment sleeve, and then the angle adjustment sleeve can be adjusted through the cooperation of the locking piece and the slot. Locked and positioned, so it can meet the needs of different users.

Description of drawings

Fig. 1 is the structural schematic diagram of the wheelchair of the present invention;

Fig. 2 is the installation structure schematic diagram of the transmission mechanism of the utility model;

3 is a schematic diagram (1) of the installation structure of the fixing rod connecting rod of the present invention;

Fig. 4 is the installation structure schematic diagram (2) of the fixing rod connecting rod of the present utility model;

5 is a schematic structural diagram of a rear wheel mounting rod of the present invention;

6 is a schematic diagram of the installation structure of the fixing rod connecting rod and the angle adjusting sleeve of the present invention;

7 is a schematic diagram of the installation structure of the chair cushion of the present invention;

8 is a schematic diagram of the installation structure of the locking member of the present invention;

9 is a schematic structural diagram of a locking member of the present invention;

10 is an enlarged schematic view of a partial installation structure of the transmission mechanism of the present invention;

11 is a schematic diagram of the installation structure of the transmission mechanism and the locking and reset mechanism of the present invention;

12 is a schematic diagram of the installation structure of the control rod of the present invention;

13 is a schematic diagram of the assembly structure of the locking and reset mechanism of the present invention;

Fig. 14 is a partial enlarged structural schematic diagram of the control rod of the present invention;

15 is a schematic structural diagram of the transmission rack of the present invention.

In the figure: 100, seat cushion; 101, fixed pin; 102, support hinge; 103, buffer spring; 200, angle adjustment sleeve; 201, card slot; 202, locking piece; 2021, limit ball; 2022, Spring; 2023, spring stop; 2024, limit pin; 301, seat back fixing rod; 302, fixing rod connecting rod; 303, first stopper; 304, first restoring spring; 401, gear; 402, transmission tooth bar; 403, second stop; 404, annular cylinder; 405, fixed teeth; 406, connecting rod; 500, wheel mounting bracket; 501, rear wheel mounting rod; 502, first fixed cylinder; 5021, first cylinder section 5022, the second cylinder section; 503, the second fixed cylinder; 504, the rotating fixed column; 505, the screw hole; 506, the perforation; 600, the seat back; 700, the armrest frame; 7021, chute; 7022, top cover; 800, seat cushion fixing rod; 900, locking reset mechanism; 901, control rod; 902, movable ratchet; 903, fixed ratchet; 904, rotating cylindrical segment; 905, free surface; 906, return spring.

Detailed ways

The present utility model will be further described below with reference to specific embodiments.

Example 1

1-15 , the standing assist wheelchair of this embodiment includes a frame, wheels (including rear wheels and front wheels), a seat cushion 100 , a seat back 600 , footrests, a transmission mechanism and a locking and reset mechanism. The frame includes a seat back fixing rod 301 , a fixing rod connecting rod 302 , a seat cushion fixing rod 800 , an armrest frame 700 and a wheel mounting frame 500 , wherein the seat back fixing rod 301 is vertically installed on both ends of the fixing rod connecting rod 302 , the seat back 600 is installed between the seat back fixing rods 301 , the seat cushion fixing rod 800 is installed on both sides of the fixing rod connecting rod 302 in the horizontal direction, and the seat cushion 100 is installed between the two seat cushion fixing rods 800 ; The wheel mounting frame 500 and the armrest frame 700 are fixedly connected to the seat cushion fixing rod 800, and the armrest 701 and the wheel are respectively mounted on the armrest frame 700 and the wheel mounting frame 500 correspondingly.

Specifically, as shown in FIG. 1 , the wheel mounting frame 500 includes a rear wheel mounting rod 501, a front wheel mounting rod and a connecting cross rod, and the two ends of the connecting cross rod are respectively connected to the rear wheel mounting rod 501 and the front wheel mounting rod. The bottoms are fixedly connected, the rear wheel is correspondingly mounted on the rear wheel mounting rod 501, and the front wheel is correspondingly mounted on the front wheel mounting rod. The armrest frame 700 includes two armrest fixing cylinders 702 vertically mounted on the seat cushion fixing rod 800 and an armrest support rod laterally connected between the two armrest fixing cylinders 702. The armrest 701 is supported and installed on the armrest support rod. .

2-6, the transmission mechanism includes a gear 401 and a transmission rack 402. In this embodiment, both ends of the fixing rod connecting rod 302 are rotatably mounted on the rear wheel mounting rod 501, and the gear 401 is sleeved on the fixed rod On the rod connecting rod 302 , the transmission rack 402 is correspondingly mounted on the rear end of the seat cushion 100 and meshes with the gear 401 . Specifically, the rear end of the seat cushion 100 is provided with a fixed pin shaft 101 , and the transmission rack 402 is fixedly connected to the seat cushion 100 through the fixed pin shaft 101 . In this embodiment, the outside of the fixing rod connecting rod 302 is provided with an angle adjustment sleeve 200, and the angle adjustment sleeve 200 is processed with a limit groove for the seat back fixing rod 301 to pass through. The rotation of the fixed rod 301 is limited and controlled.

As shown in FIG. 7 , both sides of the seat cushion 100 are supported and mounted on the seat cushion fixing rod 800 through a row of supporting hinges 102 , and the length of the supporting hinges 102 is from the back to the front (ie, along the distance away from the seat back 600 ). direction) is gradually shortened, the rear end of the seat cushion 100 is bent downward to form a certain arc, and a buffer spring 103 is provided between the bottom of the front end and the seat cushion fixing rod 800. When the wheelchair is in a normal state, the buffer spring 103 is in a compressed state.

When the user needs to stand, his body leans back, pushes the fixing rod connecting rod 302 to rotate counterclockwise relative to the rear wheel mounting rod 501 through the seat back fixing rod 301, thereby driving the gear 401 to rotate, and the rotation of the gear 401 drives the transmission rack 402 moves upward, thereby driving the rear side of the seat cushion 100 to rise, that is, the seat cushion 100 is inclined forward by a certain angle, and when the seat back fixing rod 301 rotates to the edge of the limit groove of the angle adjustment sleeve 200, the rotation stops, and the seat The mat 100 stops rising, and the user can stand up from the wheelchair. When the rear side of the seat cushion 100 gradually rises and tilts, the support hinge 102 rotates with the seat cushion 100 , thereby supporting the suspended seat cushion 100 and ensuring the stability of the seat cushion structure. A first restoring spring 304 is arranged between the seat back fixing rod 301 and the angle adjusting sleeve 200. When the first restoring spring 304 is located on the side close to the seat cushion 100, it is in the original length or stretched state under normal conditions. When the first restoring spring 304 is located on the side away from the seat cushion 100, it is in the original length or compressed state under normal conditions. Therefore, when the user leans forward and the seat back 600 loses its reclining force, the first restoring spring Under the action of 304, the seat back 600 gradually recovers, that is, returns to the vertical state.

As shown in FIGS. 10-15 , the locking and reset mechanism 900 of this embodiment includes a control rod 901 , the control rod 901 is rotatably installed in the armrest fixing cylinder 702 near the seat back 600 , and one side of the control rod 901 is processed There is a movable ratchet 902, the other side is processed with a fixed ratchet 903, the fixed ratchet 903 is fixedly installed on the control rod 901, the movable ratchet 902 can be rotated up and down and installed on the control rod 901 (such as hinged connection), the movable ratchet 902 and the lower surfaces of the fixed ratchet teeth 903 are arc-shaped structures, and the upper surfaces thereof are all planar structures (horizontal arrangement), and a return spring 906 is provided between the upper surface of the movable ratchet teeth 902 and the control rod 901; the transmission The top of the rack 402 is connected with an annular cylinder 404 through a connecting rod 406, the annular cylinder 404 is located in the armrest fixing cylinder 702, and the side wall of the armrest fixing cylinder 702 is processed with a chute 7021 for the connecting rod 406 to pass through and move up and down, The trunk of the control rod 901 is sleeved inside the annular cylinder 404 , and the inner wall of the annular cylinder 404 is machined with fixed teeth 405 that cooperate with the movable ratchet teeth 902 and the fixed ratchet teeth 903 .

The transmission rack 402 can be locked by the cooperation of the movable ratchet teeth 902 and the fixed ratchet teeth 903 on the locking and reset mechanism 900 and the fixed teeth 405 on the transmission rack, preventing the seat cushion in the normal state and during the lifting process of the seat cushion and when the user is standing. Pad 100 drops. Specifically, when the wheelchair user normally uses the wheelchair, the transmission rack 402 is locked by the cooperation of the fixed ratchet teeth 903 and the fixed teeth 405. At this time, the transmission rack 402 can neither move up nor down; When it needs to stand, the downward movement of the transmission rack 402 is restricted by the cooperation of the movable ratchet teeth 902 and the fixed teeth 405. At this time, the transmission rack 402 can only move upward to ensure that it can stand up smoothly. When the wheelchair user stands up and then sits down again, the locking of the drive rack 402 by the locking and reset mechanism 900 is released. Under the action of the user's gravity, the drive rack 402 and the seat cushion 100 can move downward to restore. . In this embodiment, the annular cylinder on the top of the transmission rack is located in the armrest fixing cylinder near the seat back, so the up and down movement of the transmission rack 402 can also be guided by the armrest fixing cylinder 702 to ensure the stability of its movement.

Example 2

The structure of the standing assist wheelchair of this embodiment is basically the same as that of Embodiment 1. Further, as shown in FIG. 14 , the trunk of the control rod 901 in this embodiment is a quadrangular prism, and the surface where the movable ratchet teeth 902 are located (the ascending control surface) ) and the surface (static control surface) where the fixed ratchet 903 is located, the other two surfaces of the control rod 901 are free surfaces 905, namely smooth surfaces, and a return spring 906 is correspondingly provided between the middle of the movable ratchet 902 and the ascending control surface, And the top of the trunk of the control rod 901 is provided with a direction adjustment handle perpendicular to the trunk, and the direction adjustment handle is outside the top cover 7022 of the armrest fixing cylinder 702 . The bottom of the trunk of the control rod 901 extends downward to form a rotating cylindrical section 904 . The bottom of the armrest fixing cylinder 702 is correspondingly provided with a rotating fixed column 504 , and the rotating cylindrical section 904 can rotate in the rotating fixed column 504 .

When the wheelchair user needs to stand, rotate the direction adjustment handle of the control rod 901 to make the movable ratchet teeth 902 of the ascending control surface correspond to the fixed teeth 405 (at this time, the transmission rack 402 can only perform one-way movement relative to the rotation control rod 901 ). upward movement), and then the user leans back against the seat back 600, when the seat cushion 100 is lifted up and the seat back 600 is in a tilted state, turn the direction adjustment handle of the control lever 901 again to make the fixed ratchet teeth 903 on the control surface and the fixed The teeth 802 cooperate with each other (the drive rack 402 remains stationary at this time), and the user slowly returns to the upright state. At this time, under the action of the restoring spring 304, the seat back 600 returns to the upright state and the seat cushion 100 remains inclined, and the wheelchair is in the upright state. A state in which the user is convenient to stand. When the user sits down again, the user first sits on the inclined seat cushion 100, rotates the direction adjustment handle of the control rod 901 to make the free surface 905 fit with the fixed teeth 405, at this time the transmission rack 402 loses the locking effect While descending, the inclined seat cushion 100 gradually becomes horizontal under the action of the human body's gravity. During the process of the seat cushion 100 from being inclined to being horizontal (the buffer spring 103 is in a compressed state), the buffer spring 103 has a buffering effect on the restoration of the seat cushion 100, that is, the restoration speed of the seat cushion 100 is slowed down by the elastic force of the buffer spring 103, This prevents the seat cushion 100 from being restored quickly and inconvenient to the user. When the wheelchair user needs to do simple movements, the direction adjustment handle of the control rod 901 can be rotated to make the free surface fit with the fixed teeth 405. At this time, the wheelchair user can also do simple sit-ups by leaning back and up. , exercise to stretch the waist.

The steps of assisting standing wheelchair from standing to sitting are: turn the direction adjustment handle of the control rod 901 until its ascending control surface cooperates with the fixed teeth 405, the person with physical inconvenience leans back, the seat back 600 is inclined, the seat cushion 100 rises, and rises to After a certain height, the human body moves upward slowly, the seat back 600 gradually returns to the vertical state, and the user stands up; when returning to the seat, turn the direction adjustment handle of the control rod 901 until its free surface corresponds to the fixed tooth 802, and when the user returns Under the action of its own gravity, the seat cushion 100 slowly returns to its original state.

Example 3

The structure of the standing assist wheelchair of this embodiment is basically the same as that of Embodiment 2. Further, as shown in FIGS. 4 and 5 , in this embodiment, a first fixing cylinder 502 and a concentrically arranged first fixing cylinder 502 are fixed on the rear wheel mounting rod 501 in this embodiment. The second fixing cylinder 503, the two ends of the fixing rod connecting rod 302 are rotatably installed in the second fixing cylinder 503, and the two ends of the angle adjusting sleeve 200 are correspondingly installed between the first fixing cylinder 502 and the second fixing cylinder 503 between. Specifically, the fixing rod connecting rod 302 is provided with a first stopper 303 on the outer sides of the two seatback fixing rods 301 , and the inner wall of the gear 401 is provided with a second stopper 403 matched with the first stopper 303 . The gear 401 is mounted on the outside of the first fixing cylinder 502 , and the first fixing cylinder 502 is machined with a circular arc groove for the second block 403 to pass through and rotate. When the wheelchair user leans back, pushes the seatback fixing rod 301 and the fixing rod connecting rod 302 to rotate, and pushes the second block 403 through the first block 303 on the fixing rod connecting rod 302, thereby driving the gear 401 to rotate , thereby driving the transmission rack 402 to move upward.

Further, the first fixed cylinder 502 is processed into a stepped structure composed of a first cylinder section 5021 and a second cylinder section 5022, and the outer diameter of the first cylinder section 5021 is larger than the outer diameter of the second cylinder section 5022 and The inner diameter of the gear 401, the gear 401 is sleeved on the outside of the second cylinder section 5022, and the second cylinder section 5022 is provided with a screw hole 505, and the gear 401 is pivoted through the bolt in the screw hole 505 and the first cylinder section 5021. to the limit.

8 and 9 , both ends of the angle adjusting sleeve 200 are provided with locking members 202 , which can rotate with the second fixing cylinder 503 as the central axis, and are then locked and fixed by the locking members 202 , thereby It is convenient to adjust the rotation range of the seat back fixing rod 301 to meet the standing requirements of different users. Specifically, both ends of the angle adjustment sleeve 200 are machined with card slots 201 distributed along the circumferential direction thereof, and the rear wheel mounting rod 501 is installed with a locking piece 202 matched with the locking slot 201. The locking piece 202 includes a limit ball 2021, a spring 2022, a spring stopper 2023 and a limit pin 2024. The rear wheel mounting rod 501 is machined with transversely distributed through holes 506. The limiting ball 2021 is fixedly connected (threaded connection), the diameter of the limiting ball 2021 is larger than the inner diameter of the through hole 506 , and the other end of the limiting pin 2024 passes through the other side of the through hole 506 to engage with the slot 201 . A spring stopper 2023 is arranged in the middle of the limiting pin 2024, a spring 2022 is arranged between the limiting ball 2021 and the spring stopper 2023, and one end of the spring 2022 is fixedly connected with the spring stopper 2023. The spring 2022 and the spring stopper 2023 They are all located inside the through hole 506 of the rear wheel mounting rod 501 (the diameter of the edges on both sides of the through hole is equal to the diameter of the limit pin 2024, and the diameter of the spring stop 2023 is equal to the diameter of the through hole, can move in it, and cannot pass through the through hole 506). In a normal working state, one end of the limiting pin 2024 is engaged with the clamping slot 201 .

Since different wheelchair users have different optimal rotation angles for the seatback fixing rod 301, before the user uses it, the limiting ball 2021 can be pulled outward to disengage the limiting pin 2024 from the clamping slot 201, and the angle adjusting sleeve can be rotated. 200, so that the rotation angle of the seatback fixing rod 301 can be adjusted. After adjustment, the locking member 202 is restored, and the limiting pin 2024 is re-engaged with the slot 201 to fix the angle adjusting sleeve 200. When the limiting pin 2024 and the slot 201 are in the engaged state, the spring 2022 is in the original length or in the compressed state (the original length of the spring 2022 is equal to or greater than the perforation length), and the spring is further compressed when the limiting ball 2021 is pulled outward, and when the angle After adjusting the angle of the adjusting sleeve, release the limiting ball 2021, and under the elastic force of the spring 2022, the limiting pin 2024 can be automatically reset and re-engaged with the slot 201.

Claims (10)

1. A standing assist wheelchair, comprising a frame, a wheel, a seat cushion (100) and a seat back (600), the frame comprising a seat back fixing rod (301), a fixing rod connecting rod (302), a seat cushion A fixing rod (800), an armrest frame (700) and a wheel mounting frame (500), wherein the seat back fixing rod (301) is fixedly installed on both ends of the fixing rod connecting rod (302), and the armrest frame (700) is fixedly installed on the chair The seat cushion fixing rod (800) is fixedly connected to the wheel mounting frame (500), and it is characterized in that it further comprises a transmission mechanism, and the transmission mechanism comprises a gear (401) and a transmission rack (402) , the gear (401) is mounted on the fixing rod connecting rod (302), and the two ends of the fixing rod connecting rod (302) are rotatably mounted on the rear wheel mounting rod (501) of the wheel mounting frame (500). The transmission rack (402) is fixedly connected with the rear end of the seat cushion (100) and meshes with the gear (401). 2. A standing assist wheelchair according to claim 1, characterized in that: both sides of the seat cushion (100) are supported and installed on the seat cushion fixing rod (800) through a row of support hinges (102), And the length of the support hinge (102) is gradually shortened along the direction away from the seat back (600). 3. A standing assist wheelchair according to claim 1, characterized in that: further comprising a locking and resetting mechanism, the locking and resetting mechanism comprising a control rod (901), and two different sides of the control rod (901) are respectively provided with There are movable ratchet teeth (902) and fixed ratchet teeth (903), the fixed ratchet teeth (903) are fixedly installed on the control rod (901), and the movable ratchet teeth (902) can be rotated up and down and installed on the control rod (901), so The drive rack (402) is correspondingly provided with a fixed tooth (405) matched with the movable ratchet (902) and the fixed ratchet (903). The downward movement of the transmission rack (402) is restricted, and the up and down movement of the transmission rack (402) is restricted by the cooperation of the fixed ratchet (903) and the fixed tooth (405). The standing assist wheelchair according to claim 3, characterized in that: the lower surfaces of the movable ratchet teeth (902) and the fixed ratchet teeth (903) are both arc-shaped structures, and the upper surfaces thereof are both planar structures , and a return spring (906) is arranged between the upper surface of the movable ratchet (902) and the control rod (901). The standing assist wheelchair according to claim 3, characterized in that: an annular cylinder (404) is connected to the top of the transmission rack (402) through a connecting rod (406), and the annular cylinder (404) Located in the armrest fixing cylinder (702) near the seat back (600), the side wall of the armrest fixing cylinder (702) is processed with a chute (7021) for the connecting rod (406) to pass through and move up and down; the control rod ( 901) is rotatably installed in the above-mentioned armrest fixing cylinder (702) and passes through the annular cylinder (404), and the fixing teeth (405) are arranged on the inner wall of the annular cylinder (404). 6. A standing assist wheelchair according to any one of claims 1-5, characterized in that: the fixing rod connecting rod (302) is installed in an angle adjustment sleeve (200), and the angle adjustment sleeve ( 200) is processed with a limit groove for the seat back fixing rod (301) to pass through, and a first restoring spring (304) is arranged between the seat back fixing rod (301) and the angle adjusting sleeve (200). 7. A standing assist wheelchair according to claim 6, characterized in that: a first fixing cylinder (502) and a second fixing cylinder (503) concentrically arranged on the rear wheel mounting rod (501) are fixed, Both ends of the fixing rod connecting rod (302) are rotatably installed in the second fixing cylinder (503), and the two ends of the angle adjusting sleeve (200) are correspondingly installed in the first fixing cylinder (502) and the second fixing cylinder between (503); the gear (401) is mounted on the outside of the first fixing cylinder (502), and the fixing rod connecting rod (302) is provided with a first stopper on the outer sides of the two seatback fixing rods (301). (303), the inner wall of the gear (401) is provided with a second stopper (403) matched with the first stopper (303), and the first fixing cylinder (502) is machined with a second stopper (403) to pass through Circular grooves for passing and turning. 8. A standing assist wheelchair according to claim 7, characterized in that: the first fixing cylinder (502) is processed into a ladder composed of a first cylinder segment (5021) and a second cylinder segment (5022) type structure, the outer diameter of the first cylinder section (5021) is larger than the outer diameter of the second cylinder section (5022) and the inner diameter of the gear (401), the gear (401) is sleeved on the outside of the second cylinder section (5022), And the second cylinder section (5022) is provided with a screw hole (505), and a limit bolt is installed in the screw hole (505). 9 . The standing assist wheelchair according to claim 6 , wherein both ends of the angle adjusting sleeve ( 200 ) are machined with clamping grooves ( 201 ) distributed along the circumferential direction thereof, and the rear wheel mounting rod A locking member (202) matched with the card slot (201) is installed on the (501), and the angle adjustment sleeve (200) is locked and positioned by the cooperation of the locking member (202) and the card slot (201). The standing assist wheelchair according to claim 9, characterized in that: the locking member (202) comprises a limit ball (2021), a spring (2022), a spring stopper (2023) and a limiter A pin (2024), the rear wheel mounting rod (501) is machined with perforations (506) distributed along the lateral direction, and one end of the limit pin (2024) is fixedly connected to the limit ball (2021) through the through hole (506), The other end of the limiting pin (2024) can be snap-fitted with the clamping groove (201), and a spring stopper (2023) is arranged in the middle of the limiting pin (2024), the limiting ball (2021) and the spring stopper (2023) A spring (2022) is arranged between ), and both the spring (2022) and the spring stopper (2023) are located inside the through hole (506) of the rear wheel mounting rod (501).

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