阅读说明：本技术 背部转向机械轮椅 (Back steering mechanical wheelchair ) 是由 陈劲松 公禹豪 庞宇帆 韩英杰 于 2019-11-05 设计创作，主要内容包括：本发明涉及医疗器械技术领域,具体公开了一种背部转向机械轮椅,包括座位、车轮、扶手、轮椅支架、踏板、转向靠背、转向架和导向轮,转向靠背的中部通过靠背转向轴与轮椅支架转动连接且转向靠背位于座位上方与人体后背对应的位置,转向架通过竖直方向的转轴与轮椅支架的前部转动连接,导向轮设在转向架上,转向靠背的左右两侧分别通过闸线与转向架的左右两侧连接,当转向靠背相对于轮椅支架转动时,转向架也能够同时相对于轮椅支架转动,从而带动导向轮改变方向。本发明改善了现有技术中的问题,整体结构简单,功能丰富,使用便利,不仅满足了特殊使用者对轮椅的功能要求,而且制造成本较低,便于普及化,对老年人和残疾人的生活具有极大的意义。(The invention relates to the technical field of medical instruments, and particularly discloses a back steering mechanical wheelchair which comprises a seat, wheels, armrests, a wheelchair support, pedals, a steering backrest, a steering frame and guide wheels, wherein the middle part of the steering backrest is rotationally connected with the wheelchair support through a backrest steering shaft, the steering backrest is positioned above the seat and corresponds to the back of a human body, the steering frame is rotationally connected with the front part of the wheelchair support through a vertical rotating shaft, the guide wheels are arranged on the steering frame, the left side and the right side of the steering backrest are respectively connected with the left side and the right side of the steering frame through brake cables, and when the steering backrest rotates relative to the wheelchair support, the steering frame can also simultaneously rotate relative to the wheelchair support, so that the guide wheels are driven to change directions. The wheelchair solves the problems in the prior art, has simple integral structure, rich functions and convenient use, not only meets the functional requirements of special users on the wheelchair, but also has lower manufacturing cost and convenient popularization and has great significance for the life of the old and the disabled.)

1. A back steering mechanical wheelchair comprises a seat (33), wheels (20), armrests (21), a wheelchair support (13) and pedals (43), wherein the seat (33) is arranged on the wheelchair support (13), the two wheels (20) are respectively arranged on the left side and the right side of the wheelchair support (13), the armrests (21) are arranged on the upper portion of the wheelchair support (13), and the pedals (43) are arranged on the front portion of the wheelchair support (13), and the back steering mechanical wheelchair is characterized by further comprising a steering backrest (29), a steering frame (7) and guide wheels (6), wherein the middle portion of the steering backrest (29) is rotatably connected with the wheelchair support (13) through a backrest steering shaft (52), the steering backrest (29) is positioned above the seat (33) and corresponds to the back of a human body, and the steering frame (7) is rotatably connected with the front portion of the wheelchair support (13) through a rotating shaft in the vertical direction, the steering wheel (6) is arranged on the bogie (7), the left side and the right side of the steering backrest (29) are respectively connected with the left side and the right side of the bogie (7) through brake cables, and when the steering backrest (29) rotates relative to the wheelchair support (13), the bogie (7) can also rotate relative to the wheelchair support (13) at the same time, so that the steering wheel (6) is driven to change the direction.

2. The back-steering mechanical wheelchair according to claim 1, further comprising a steering shaft buckle (51) and a telescopic shaft (31), wherein the steering shaft buckle (51) is connected with the wheelchair support (13) through the telescopic shaft (31), the telescopic shaft (31) can be vertically stretched relative to the wheelchair support (13), the steering shaft buckle (51) is provided with a through hole in the front-back direction corresponding to the backrest steering shaft (52), the backrest steering shaft (52) is arranged in the middle of the rear side of the steering backrest (29), and the backrest steering shaft (52) is rotatably connected with the wheelchair support (13) through the steering shaft buckle (51).

3. The back-steering mechanical wheelchair as claimed in claim 1, wherein the guide wheels (6) are two and are respectively arranged at the left side and the right side of the bogie (7), the guide wheels (6) are connected with the bogie (7) through wheel forks (1), and the upper ends of the wheel forks (1) are rotatably connected with the bogie (7).

4. Back-steered mechanical wheelchair according to claim 1, characterized in that the steering backrest (29) is provided with a lap belt (28).

5. The back-steering mechanical wheelchair as claimed in claim 1, further comprising a hand wheel (23), a driving upper single-row chain wheel (53), a driving lower single-row chain wheel, a driving chain (54), a transmission shaft (16), a driven upper single-row chain wheel, a driven lower single-row hurdle wheel (49), a driven chain (12) and a hand wheel support, wherein the hand wheel (23) and the driving upper single-row chain wheel (53) are both mounted above one side of the wheelchair support (13) through the hand wheel support, the hand wheel (23) is coaxially and fixedly connected with the driving upper single-row chain wheel (53) and can drive the driving upper single-row chain wheel (53) to rotate, the driving lower single-row chain wheel is coaxially and fixedly connected with the driven upper single-row chain wheel through the transmission shaft (16), and the driving upper single-row chain wheel (53) and the driving lower single-row chain are used for transmitting power through the driving chain (54), the driven lower single-row column wheel (49) is coaxially and fixedly connected with the wheel (20), and the driven upper single-row chain wheel and the driven lower single-row column wheel (49) transmit power through the driven chain (12).

6. The back-steered mechanical wheelchair as claimed in claim 5, wherein the outer portions of the driving upper single sprocket (53), the driving lower single sprocket and the driving chain (54) are provided at both sides with a first driving upper sprocket housing (25) and a second driving upper sprocket housing (22), respectively, and the outer portions of the driven upper single sprocket, the driven lower single sprocket (49) and the driven chain (12) are provided at one side with a driven lower sprocket housing (11).

7. The back-steering mechanical wheelchair as claimed in claim 5, further comprising a safety pressing plate (46) and a brake pad (19), wherein the safety pressing plate (46) is arranged on the hand wheel (23), the brake pad (19) is arranged on the wheelchair support (13) and corresponds to the wheel (20), the safety pressing plate (46) is connected with the brake pad (19) through a brake cable, when the safety pressing plate (46) is tightly held with the hand wheel (23), the brake pad (19) does not brake the wheel (20), and when the safety pressing plate (46) is released with the hand wheel (23), the brake pad (19) brakes the wheel (20).

8. The back-steered mechanical wheelchair as claimed in claim 1, wherein the ends of the armrests are provided with non-slip mats (44).

9. Back-steering mechanical wheelchair according to claim 1, characterized in that the rear part of the wheelchair frame (13) is provided with a storage basket (50).

10. Back-steered mechanical wheelchair according to any of claims 1 to 9, characterized in that the two wheels (20) of the left and right side are not coaxial.

Technical Field

The invention relates to the technical field of medical instruments, in particular to a back steering mechanical wheelchair with steering controlled by the back.

Background

Currently, wheelchair products on the market are mainly classified into two categories: firstly, the electric wheelchair is electric, generally adopts full electric type, is simple to operate, but is high in price, is difficult to bear by common salary families, and has a plurality of functional structure designs which do not accord with the national conditions, so that the electric wheelchair is an important factor for hindering the popularization of the electric wheelchair; secondly, mechanical type, although this kind of wheelchair is not high, but the function is simple, and is higher to user's physical quality requirement, and is weaker to user's adaptability. And when the wheelchair product is not used for distinguishing different users, such as hemiplegic patients or old people, the mechanical wheelchair is very laborious to use.

Although the prior art has a plurality of electric wheelchairs with different functions, the functions of the product are limited, the functionality is single, the safety and the comfort are still considered, the special physical requirements of the old cannot be well met, and the labor cost of the product is high, so that the product is high in selling price and difficult to popularize and use in a large range. The existing purely mechanical wheelchair has simple functions, operability, functionality, safety and comfort are difficult to meet the requirements of users, and the requirements of wheelchair users can not be well met due to the fact that no clear market target and product positioning exist. Although the manual wheelchair is low in price, the structure and the function are simple, and the manual wheelchair gradually exits from the historical stage. In addition, special wheelchairs such as special wheelchairs and electric wheelchairs are still not popularized, the development of the special wheelchairs is greatly hindered due to the high operation difficulty and the generally higher price, and the design of a plurality of functions and structures is not practical.

Disclosure of Invention

The invention aims to provide a back steering mechanical wheelchair, which solves the problems that the wheelchair in the prior art is complex in integral structure, single in function, not used, high in manufacturing cost, incapable of meeting the functional requirements of special users on the wheelchair and the like.

In order to solve the technical problems, the invention provides a back steering mechanical wheelchair, which comprises a seat, two wheels, armrests, a wheelchair support and pedals, wherein the seat is arranged on the wheelchair support, the two wheels are respectively arranged at the left side and the right side of the wheelchair support, the armrests are arranged at the upper part of the wheelchair support, the pedals are arranged at the front part of the wheelchair support, the back steering mechanical wheelchair further comprises a steering backrest, a steering frame and guide wheels, the middle part of the steering backrest is rotationally connected with the wheelchair support through a backrest steering shaft, the steering backrest is positioned above the seat and corresponds to the back of a human body, the steering frame is rotationally connected with the front part of the wheelchair support through a vertical rotating shaft, the guide wheels are arranged on the steering frame, the left side and the right side of the steering backrest are respectively connected with the left side and the right side of the steering frame through brake lines, when the steering backrest rotates relative to the wheelchair bracket, the steering frame can also rotate relative to the wheelchair bracket at the same time, so that the guide wheels are driven to change the direction.

Preferably, still include steering spindle detain and telescopic shaft, the steering spindle detain to pass through the telescopic shaft with wheelchair leg joint, the telescopic shaft can for the wheelchair support is flexible from top to bottom, the steering spindle detain be equipped with the fore-and-aft direction's that the back steering shaft corresponds through-hole, the back steering shaft is established turn to the middle part of back side, the back steering shaft passes through the steering spindle detain with the wheelchair support rotates to be connected.

Preferably, the guide wheels are two and are respectively arranged on the left side and the right side of the bogie, the guide wheels are connected with the bogie through wheel forks, and the upper ends of the wheel forks are rotatably connected with the bogie.

Preferably, the steering backrest is provided with a lap belt.

Preferably, still include the hand wheel, the initiative on the single-row sprocket, under the initiative single-row sprocket, drive chain, transmission shaft, driven on the single-row sprocket, driven single-row fence wheel, driven chain and hand wheel support down, the hand wheel all passes through with the initiative on the single-row sprocket the hand wheel support mounting is in the top of wheelchair support one side, the hand wheel with the coaxial fixed connection of single-row sprocket and can drive on the initiative the single-row sprocket rotates, under the initiative the single-row sprocket with driven on the single-row sprocket passes through the coaxial fixed connection of transmission shaft, on the initiative the single-row sprocket with the single-row chain passes through under the initiative the drive chain transmits power, under the driven single-row fence wheel with the coaxial fixed connection of wheel, on the driven single-row sprocket with driven under the single-row fence wheel passes through driven chain transmits power.

Preferably, the two sides of the outer parts of the driving upper single-row chain wheel, the driving lower single-row chain wheel and the driving chain are respectively provided with a first driving upper chain wheel shell and a second driving upper chain wheel shell, and one side of the outer parts of the driven upper single-row chain wheel, the driven lower single-row hurdle wheel and the driven chain is provided with a driven lower chain wheel shell.

Preferably, still include safe preforming and brake block, safe preforming is established on the hand wheel, the brake block establish on the wheelchair support and with the wheel position corresponds, safe preforming pass through the brake line with the brake block is connected, works as safe preforming with when the hand wheel is gripped, the brake block is not in the wheel braking, works as safe preforming with when the hand wheel is loosened, the brake block is right the wheel braking.

Preferably, the end of the handrail is provided with a non-slip mat.

Preferably, a storage basket is arranged at the rear part of the wheelchair support.

Preferably, the two wheels on the left and right sides are not coaxial.

The back steering mechanical wheelchair effectively solves the problems in the prior art by utilizing the functions of back steering, single-hand driving and the like, has simple integral structure, rich functions and convenient use, not only meets the functional requirements of special users on the wheelchair, but also has lower manufacturing cost and convenient popularization, and has great significance for the life of the old and the disabled.

Drawings

FIG. 1 is a front view of a back-steering mechanical wheelchair in accordance with an embodiment of the present invention;

FIG. 2 is a left side elevational view of a back-steering mechanical wheelchair in accordance with an embodiment of the present invention;

FIG. 3 is a top view of a back-steered mechanical wheelchair in accordance with an embodiment of the present invention;

FIG. 4 is a perspective view of a back-steered mechanical wheelchair in accordance with an embodiment of the present invention;

FIG. 5 is a perspective view of a back-steered mechanical wheelchair in accordance with an embodiment of the present invention;

fig. 6 is a perspective view of a back-steered mechanical wheelchair in accordance with an embodiment of the present invention.

In the figure, 1: a wheel fork; 2: a first brake cable sheath; 3: buckling; 4: riveting; 5: a first brake wire core; 6: a guide wheel; 7: a bogie; 8: a right brake cable head right-angle connector; 9: a bolt; 10: a nut; 11: a driven lower sprocket housing; 12: a driven chain; 13: a wheelchair frame; 14: a hand wheel armrest; 15: a cushion; 16: a drive shaft; 17: a brake hinge; 18: a second brake line sheath; 19: a brake pad; 20: a wheel; 21: a handrail; 22: a second drive upper sprocket housing; 23: a hand wheel; 24: a screw; 25: a first driving upper sprocket housing; 26: a third brake line sheath; 27: a fourth brake line sheath; 28: a lap belt; 29: a steering backrest; 30: a brake cable head connecting piece; 31: a telescopic shaft; 32: a screw; 33: a seat; 34: a fifth brake line sheath; 35: a left brake cable head right-angle connecting piece; 36: a second brake wire core; 37: a first brake cable head fitting; 38: riveting; 39: a bolt; 40: a part screw cap; 41: a pedal sleeve; 42: a screw; 43: a pedal; 44: a non-slip mat; 45: a second brake cable head fitting; 46: safe tabletting; 47: a nut; 48: a bolt; 49: a driven lower single-row sprocket; 50: a storage basket; 51: a steering shaft buckle; 52: a backrest steering shaft; 53: driving the upper single-row chain wheel; 54: and a driving chain.

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

As shown in fig. 1 to 6, the back-steered mechanical wheelchair of the present embodiment includes: seat 33, wheel 20, handrail 21, wheelchair support 13 and footboard 43, seat 33 is established on wheelchair support 13, and wheel 20 is two and establishes respectively in the left and right sides of wheelchair support 13, and handrail 21 establishes the upper portion at wheelchair support 13, and footboard 43 establishes the front portion at wheelchair support 13, and footboard 43 is equipped with pedal cover 41, still includes: the middle part of the steering backrest 29 is rotatably connected with the wheelchair support 13 through a backrest steering shaft 52, the steering backrest 29 is positioned above the seat 33 and corresponds to the back of a human body, the bogie 7 is rotatably connected with the front part of the wheelchair support 13 through a vertical rotating shaft, the guide wheels 6 are arranged on the bogie 7 and rotatably connected through a bolt 39, the left side and the right side of the steering backrest 29 are respectively connected with the left side and the right side of the bogie 7 through brake lines, when the steering backrest 29 rotates relative to the wheelchair support 13, the bogie 7 can also simultaneously rotate relative to the wheelchair support 13, and therefore the guide wheels 6 are driven to change directions. The brake cable system includes: first brake cable crust 2, detain 3, rivet 4, first brake cable core 5, right brake cable head right angle connecting piece 8, bolt 9, nut 10, second brake cable crust 18, third brake cable crust 26, fourth brake cable crust 27, brake cable head connecting piece 30, fifth brake cable crust 34, left brake cable head right angle connecting piece 35, second brake cable core 36, first brake cable head accessory 37, rivet 38, part screw cap 40, screw 42 and second brake cable head accessory 45.

The back-steered mechanical wheelchair of the present embodiment further comprises: the wheelchair comprises a steering shaft buckle 51 and a telescopic shaft 31, wherein the steering shaft buckle 51 is connected with the wheelchair bracket 13 through the telescopic shaft 31, the telescopic shaft 31 can be vertically stretched relative to the wheelchair bracket 13, the steering shaft buckle 51 is provided with a through hole in the front-back direction corresponding to a backrest steering shaft 52, the backrest steering shaft 52 is arranged in the middle of the rear side of a steering backrest 29, and the backrest steering shaft 52 is rotatably connected with the wheelchair bracket 13 through the steering shaft buckle 51. The guide wheels 6 are two and are respectively arranged on the left side and the right side of the bogie 7, the guide wheels 6 are connected with the bogie 7 through wheel forks 1, and the upper ends of the wheel forks 1 are rotatably connected with the bogie 7. The steering backrest 29 is provided with a lap belt 28. The seat 33 further includes: the hand wheel armrest 14 and the cushion 15, and the cushion 15 is connected with the seat 33 through screws 32. The two wheels 20 on the left and right sides are not coaxial. The bogie 7 receives the pulling force from the brake cable core and rotates around a rotating shaft matched with the brake cable core, the bogie 7 achieves the effect of controlling the advancing direction of the wheelchair and realizing left-right steering through self rotation due to the fact that the two wheels 20(M660) are not coaxial, and the bogie 7, the wheelchair support 13 and the pedal 43 are connected up and down through one shaft to realize relative motion among all parts. The steering backrest 29 is connected with a brake cable through a brake cable head connecting piece 30 and used for transmitting force through the brake cable core when a user needs to steer according to the requirement, the brake cable penetrates through a part screw cap 40 and a right-angle connecting piece, the tail end of the brake cable is horizontally fixed by a buckle 3 on the right-angle connecting piece of the left brake cable head and the right brake cable head, the traction force provided by the brake cable core for the bogie 7 to rotate around the shaft is ensured to be in the horizontal direction, the tail end of the brake cable penetrates through the bogie and is fixedly connected with a first brake cable head fitting 37, the first brake cable head fitting 37 is larger than a hole of the bogie 7, the brake cable is ensured to provide reliable traction force for the bogie 7, the rotating function of the steering backrest 29 is fixedly connected with a backrest steering shaft 52, a copying steering shaft is matched with a steering shaft buckle 51 and can rotate mutually, a telescopic shaft 31 is arranged below the steering shaft buckle and has the function of adjusting the height, is suitable for different crowds.

The back-steered mechanical wheelchair of the present embodiment further comprises: the hand wheel 23, the driving upper single-row chain wheel 53, the driving lower single-row chain wheel, the driving chain 54, the transmission shaft 16, the driven upper single-row chain wheel, the driven lower single-row hurdle wheel 49, the driven chain 12 and the hand wheel support, the hand wheel 23 and the driving upper single-row chain wheel 53 are both installed above one side of the wheelchair support 13 through the hand wheel support, the hand wheel 23 is coaxially and fixedly connected with the driving upper single-row chain wheel 53 and can drive the driving upper single-row chain wheel 53 to rotate, the driving lower single-row chain wheel is coaxially and fixedly connected with the driven upper single-row chain wheel through the transmission shaft 16, the driving upper single-row chain wheel 53 and the driving lower single-row chain wheel transmit power through the driving chain 54, the driven lower single-row hurdle wheel 49 is coaxially and fixedly connected with the wheel 20, and the driven upper single-row. The driving lower single-row chain wheel and the driven upper single-row chain wheel are respectively clamped with the transmission shaft 16 through a connecting key, and the driven lower single-row chain wheel 49 is clamped with the shaft of the large wheel 20 through a connecting key to prevent relative rotation, so that the transmission of torque is ensured. The two sides of the outer parts of the driving upper single-row chain wheel 53, the driving lower single-row chain wheel and the driving chain 54 are respectively provided with a first driving upper chain wheel shell 25 and a second driving upper chain wheel shell 22 which are connected through a screw 24, and one side of the outer parts of the driven upper single-row chain wheel, the driven lower single-row hurdle wheel 49 and the driven chain 12 is provided with a driven lower chain wheel shell 11. The shells are respectively fixed on the side surfaces of the wheelchair support 13 and the seat 33 through a welding process, and bearings are arranged between the wheels and the shells, so that the rotation and the positioning of the shaft are ensured. The shell is used for sealing and protecting the chain wheel mechanism and protecting a user to prevent accidental injury. The wheelchair further comprises a safety pressing sheet 46, a brake pad 19 and a brake hinge 17, wherein the safety pressing sheet 46 is arranged on the hand wheel 23, the brake pad 19 is arranged on the wheelchair support 13 and corresponds to the position of the wheel 20 and is connected with the wheel through a nut 47 and a bolt 48, the safety pressing sheet 46 is connected with the brake pad 19 through a brake cable, when the safety pressing sheet 46 is tightly held with the hand wheel 23, the brake pad 19 does not brake the wheel 20, and when the safety pressing sheet 46 is loosened from the hand wheel 23, the brake pad 19 brakes the wheel 20. The safety pressing sheet 46 is arranged on the handle of the hand wheel 23 through a hinge, the tail end of the safety pressing sheet is provided with a spring, and the other end of the spring is connected with the handle of the hand wheel 23, so that the recoverability of the safety pressing sheet 46 is ensured. The wheel 20 on the opposite side of the hand wheel 23 (e.g., the left wheel 20) is connected to the wheelchair frame 13 via bearings to provide wheel axle traction for driving by friction with the ground when the left wheel is directly dialed by the left hand, and to provide support and roll only when the right single-handed drive sprocket assembly is used for driving by the user.

The ends of the armrests are provided with non-slip mats 44. The rear part of the wheelchair frame 13 is provided with a storage basket 50.

The back steering mechanical wheelchair of the embodiment can be additionally provided with the following structures: other humanized devices can be added according to humanized requirements, such as adding a medicine box storage at the side of the dominant hand and leading the backrest to be more in line with the ergonomic structure; an alarm is added, so that a user can seek help in case of emergency; a neck support with adjustable height is added to be suitable for a user to use for a long time; to protect the user, the product is expected to add a set of braking devices at the rear.

The back steering mechanical wheelchair effectively solves the problems in the prior art by utilizing the functions of back steering, single-hand driving and the like, has simple integral structure, rich functions and convenient use, not only meets the functional requirements of special users on the wheelchair, but also has lower manufacturing cost and convenient popularization, and has great significance for the life of the old and the disabled.

① the backrest of the wheelchair is designed to be rotatable, when in use, the rotation of the backrest is converted into the rotation of the guide wheels to realize the function of utilizing the back to steer, and meanwhile, the safety belt is arranged on the backrest, on the basis of realizing the function of the safety belt, the backrest can be better controlled by utilizing the back of a user, because the large wheels are not coaxial, the direction of the wheelchair is controlled by the guide wheels, namely, the user can directly control the trend of the wheelchair by rotating the back, and simultaneously, the amplitude and the sensitivity of the rotation of the wheelchair and the guide wheels are adjusted, the user can control the advancing direction of the wheelchair by rotating the backrest more easily, the mode of utilizing two hands to steer when using the traditional wheelchair is broken, the liberation of the two hands when in steering is realized, the back is utilized to control the steering, the rotation of the backrest depends on the waist to exert force to control, and the human body idle strength resources are utilized to a great extent.

② the single hand operation is adopted, the hand wheel is used as the driving force of the wheel chair, because the gear and chain transmission are used, the driving mode is more labor-saving than the traditional mechanical wheel chair, the designed single hand operation wheel chair not only can make up the current market vacancy, but also can vacate one hand to solve the relevant condition when the user with normal hands meets the emergency or some special conditions, and not just as the two hands are limited in the action of controlling the wheel chair when the traditional wheel chair is operated, and can not solve or even be hurt in the face of the relevant condition.

③ automatic brake during idle operation, the work or brake is controlled by the handle of the rocking wheel, when the wheelchair is operating, the wheelchair can walk normally, when the idle operation, the wheelchair brakes automatically, the product is designed innovatively at the brake position, the work state and the non-work state of the brake mechanism are exchanged, when the wheelchair is operating normally, the brake handle, namely the rocking wheel handle, is held, the brake block on the wheel is loosened, when the brake is needed, the brake block is loosened, the initial state, namely the tight braking state, can be restored.

④ in order to ensure the comfort of the wheelchair, the backrest is provided with an adjusting rod for adjusting the height of the backrest so as to meet the different requirements of different patients on the height of the backrest.

⑤ the rotation of the guide wheel is controlled by the user through the back rest by the force of the back, and the force is transmitted between the back rest and the guide wheel through the brake-like wire structure.

⑥ the product design accords with human engineering, can realize including back height-adjustable, the wheelchair seat is provided with the ventilation hole, and have the additional function that other accords with the old person's demand such as putting the thing basket and similar to the wheelchair rear side.

It is found through investigation that a general wheelchair is designed for the disabled and the elderly to use. The wheelchair becomes a daily tool for riding instead of walking because of the inconvenience of legs and feet. But the physiological and psychological needs of different disabled and elderly people are different, for example, a disabled person may have disabled lower body, but may have remaining upper limb strength, and may have special needs like hemiplegic patients, while an elderly person may have less physical strength than before with the age. Therefore, the above factors need to be comprehensively considered, and the design of each function of the wheelchair is perfected as much as possible, so as to meet the use requirements of the disabled and the old on the wheelchair, reduce the exercise intensity of the user to the greatest extent, and achieve the purpose of simple and labor-saving operation.

The back steering mechanical wheelchair is suitable for all wheelchair-requiring crowds, but is more prone to meeting the wheelchair-requiring crowds with hemiplegia, single-arm disability, the elderly and general economic conditions. For the special population, the general wheelchair products can not well meet the requirements of the special population, related wheelchairs for special patients including hemiplegic patients and single-arm patients are not provided, if the requirements exist, most wheelchairs need to be customized, and the customized wheelchairs are high in price, relatively single in function and not comprehensive in design in all aspects. Therefore, families with ordinary conditions generally entrust to select ordinary wheelchairs. The back steering mechanical wheelchair not only well meets the requirements of special patients, but also has relatively-high price, so that the wheelchair has certain advantages in the wheelchair market, is relatively wide in popular aspect and has good market prospect.

The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.