阅读说明：本技术 椅背与扶手协同动作的轮椅及其工作方法 (Wheelchair with cooperative action of chair back and armrests and working method of wheelchair ) 是由 揭业冰 许文松 陈景端 于 2021-07-20 设计创作，主要内容包括：本发明涉及一种椅背与扶手协同动作的轮椅及其工作方法,包括车身架,其特征在于：所述车身架上设置有连接支架,所述连接支架上设置有靠背总成,所述靠背总成与连接支架之间通过转动组件转动连接,所述转动组件上的转动盘与扶手总成的转动副连接,以在转动盘转动时,转动副同步转动；所述转动副上转动连接有铰接轴,所述铰接轴第一侧部上限位转动连接有扶手,所述车身架上还铰接连接有长度可调的第一连杆,所述第一连杆的自由端与铰接轴第二侧部上设有的摆臂铰接,第一连杆与摆臂形成连杆曲柄机构,以使第一连杆驱使铰接轴和扶手反向摆转。该椅背与扶手协同动作的轮椅可实现最佳的使用舒适度。(The invention relates to a wheelchair with a chair back and armrests acting cooperatively and a working method thereof, wherein the wheelchair comprises a vehicle body frame and is characterized in that: the vehicle body frame is provided with a connecting support, the connecting support is provided with a backrest assembly, the backrest assembly is rotatably connected with the connecting support through a rotating component, and a rotating disc on the rotating component is connected with a rotating pair of the armrest assembly so that the rotating pair synchronously rotates when the rotating disc rotates; the articulated shaft is connected with in the rotation on the revolute pair, spacing rotation is connected with the handrail on the first side of articulated shaft, still articulated being connected with length-adjustable's first connecting rod on the automobile body frame, the swing arm that is equipped with on the free end of first connecting rod and the articulated shaft second side is articulated, and first connecting rod forms connecting rod crank mechanism with the swing arm to make first connecting rod order about articulated shaft and handrail reverse pendulum and change. The wheelchair with the chair back and the armrests acting cooperatively can achieve the best use comfort.)

1. The utility model provides a back of chair and handrail concerted action's wheelchair, includes automobile body frame, its characterized in that: the vehicle body frame is provided with a connecting support, the connecting support is provided with a backrest assembly, the backrest assembly is rotatably connected with the connecting support through a rotating component, and a rotating disc on the rotating component is connected with a rotating pair of the armrest assembly so that the rotating pair synchronously rotates when the rotating disc rotates; the articulated shaft is connected with in the rotation on the revolute pair, spacing rotation is connected with the handrail on the first side of articulated shaft, still articulated being connected with length-adjustable's first connecting rod on the automobile body frame, the swing arm that is equipped with on the free end of first connecting rod and the articulated shaft second side is articulated, and first connecting rod forms connecting rod crank mechanism with the swing arm to make first connecting rod order about articulated shaft and handrail reverse pendulum and change.

2. The chair back and armrest co-operating wheelchair as claimed in claim 1, wherein: the rotating assembly comprises a rotating shaft erected on the connecting support, a driving motor for driving the rotating shaft to rotate is arranged on the side part of the rotating shaft, a fixed disc and a core disc of a rotating disc which can rotate relatively are arranged at two ends of the rotating shaft, and the rotating disc of the core disc and the rotating shaft are sleeved to form an integral rotating; the fixed disk of the core disk is fixedly connected with wing plates on two sides of the connecting support, the rotating disk of the core disk is fixedly connected with the limiting plate, the backrest assembly is fixedly connected with the limiting plate, and the driving motor is fixedly connected to the limiting plate.

3. The chair back and armrest co-operating wheelchair as claimed in claim 2, wherein: the fixed disk is provided with a plurality of first lugs on the relative one side of two pterygoid laminas of linking bridge, be provided with a plurality of first recesses that correspond with first lug on the linking bridge, be provided with a plurality of second lugs on the relative one side of rolling disc and limiting plate, be provided with a plurality of second recesses that correspond with the second lug on the limiting plate, the pivot links firmly with the centre bore of rolling disc, the pivot is empty nested with the centre bore of fixed disk and pterygoid lamina.

4. A wheelchair in accordance with claim 1, 2 or 3, wherein the chair back and armrest cooperate to define: the handrail is connected with a positioning ring, and the positioning ring is provided with a plurality of notches for limiting.

5. The chair back and armrest co-operating wheelchair as claimed in claim 4, wherein: a limiting ring is fixedly sleeved on the hinged shaft, and a stop block matched with the notch is arranged on the limiting ring.

6. The chair back and armrest co-operating wheelchair as claimed in claim 4, wherein: the positioning ring comprises a disc body, a central circular hole arranged on the disc body and a plurality of through holes uniformly distributed on the disc body, the central circular hole is sleeved on a bearing positioned on the hinge shaft, and the through holes are in locking connection with the handrail through bolts; the notch is arranged on the periphery of the positioning ring and comprises three independent semicircular notch openings and an elongated slot with a circumferential angle of 90-150 degrees.

7. A wheelchair in accordance with claim 5 or 6, wherein the chair back and armrest co-operate: the limiting plate lateral part is connected with the first end of the flange shaft, the second end of the flange shaft is connected with the end plate, the end plate is connected with the cover body, the revolute pair comprises the flange shaft, the end plate and the cover body, a guide groove is arranged in the cover body, a sliding wheel is arranged in the guide groove in a sliding mode, an elastic part for pushing the sliding wheel is arranged in the cover body, and the notch is limited in cooperation with the sliding wheel.

8. The chair back and armrest co-operating wheelchair as claimed in claim 7, wherein: the back assembly is gone up to slide and is provided with the back pad, be provided with linkage drive arrangement between back pad and the linking bridge, when the back assembly rotates, the back pad slides from top to bottom along with the angle change of back assembly, the back assembly is including being fixed in the support strip on the limiting plate, be provided with the keysets of "L" type on the support strip, all be provided with the slide rail on the keysets, be provided with the slip chain link in the slide rail, erect the mounting panel between the slip chain link, the back pad sets up in the front side of mounting panel.

9. The chair back and armrest co-operating wheelchair as claimed in claim 8, wherein: a housing is further erected between the two adapter plates, the housing and the mounting plate form an adjusting bin, and a backrest cushion positioning assembly is further arranged in the adjusting bin; the backrest cushion positioning assembly comprises a rack arranged on the rear side of the mounting plate, a rotating knob is arranged on the housing, an adjusting gear is arranged at one end, close to the backrest cushion, of the rotating knob, and the adjusting gear is meshed with the rack; the housing is provided with a fixed ring, a bearing is arranged in the fixed ring, and the rotating knob is fixedly connected with an inner ring of the bearing; the linkage driving device comprises a rotating handle, the rotating handle is fixedly connected with one end of a rotating knob, which is far away from the backrest cushion, the tail end of the rotating handle is hinged with a universal joint ball head connecting rod, and the other end of the universal joint ball head connecting rod is hinged with a connecting support; the universal joint ball head connecting rod comprises two connecting rod ball heads and a connecting rod, wherein one connecting rod ball head is connected with the connecting rod through positive threads, the other connecting rod ball head is connected with the connecting rod through negative threads, and anti-skid grains are arranged on the outer surface of the connecting rod.

10. A method of operating a wheelchair having a back and arms in cooperation as claimed in any one of claims 1 to 9, the method comprising: when the angle of the backrest assembly is adjusted, the rotating disc on the rotating component drives the revolute pair, the handrail assembly and the handrail to rotate along with the revolute pair, and when the rotary assembly rotates to a certain angle, the handrail does not swing along with the backrest assembly any longer due to the driving of the first connecting rod and the swing arm, but the hinge shaft and the handrail swing reversely.

The technical field is as follows:

the invention relates to a wheelchair with a chair back and armrests acting cooperatively and a working method thereof.

Background art:

with the progress and development of society, more and more disabled people want to return to the society to carry out normal learning, working and living; the electric wheelchair is suitable for the old and the weak with disabled lower limbs and inconvenient walking, and has the characteristics of large range of motion, more applicable people, powerful functions and the like compared with a manual wheelchair, a nursing bed and the like.

However, most of the existing electric wheelchairs only have a simple sitting and leaning function or only can adopt manual adjustment of the backrest angle, so that a user cannot independently adjust the self-sitting posture. In addition, in the process of flatting the chair back of the conventional electric wheelchair, the position of the armrests is unreasonable to adjust, or the positions of the armrests are not changed, or the positions of the armrests and the swinging angle of the chair back are the same, so that people feel uncomfortable to use the electric wheelchair.

The invention content is as follows:

the invention aims to provide a wheelchair with a chair back and armrests acting in a coordinated manner and a working method thereof.

The technical scheme of the invention is as follows: the utility model provides a back of chair and handrail concerted action's wheelchair, includes automobile body frame, its characterized in that: the vehicle body frame is provided with a connecting support, the connecting support is provided with a backrest assembly, the backrest assembly is rotatably connected with the connecting support through a rotating component, and a rotating disc on the rotating component is connected with a rotating pair of the armrest assembly so that the rotating pair synchronously rotates when the rotating disc rotates; the articulated shaft is connected with in the rotation on the revolute pair, spacing rotation is connected with the handrail on the first side of articulated shaft, still articulated being connected with length-adjustable's first connecting rod on the automobile body frame, the swing arm that is equipped with on the free end of first connecting rod and the articulated shaft second side is articulated, and first connecting rod forms connecting rod crank mechanism with the swing arm to make first connecting rod order about articulated shaft and handrail reverse pendulum and change.

Furthermore, the rotating assembly comprises a rotating shaft erected on the connecting support, a driving motor for driving the rotating shaft to rotate is arranged on the side part of the rotating shaft, a fixed disc and a core disc of the rotating disc which can rotate relatively are arranged at two ends of the rotating shaft, and the rotating disc of the core disc and the rotating shaft are sleeved to form an integral rotation; the fixed disk of the core disk is fixedly connected with wing plates on two sides of the connecting support, the rotating disk of the core disk is fixedly connected with the limiting plate, the backrest assembly is fixedly connected with the limiting plate, and the driving motor is fixedly connected to the limiting plate.

Furthermore, be provided with a plurality of first lugs in the relative one side of two pterygoid laminas of above-mentioned fixed disk and linking bridge, be provided with a plurality of first recesses that correspond with first lug on the linking bridge, be provided with a plurality of second lugs in the relative one side of rolling disc and limiting plate, be provided with a plurality of second recesses that correspond with the second lug on the limiting plate, the pivot links firmly with the centre bore of rolling disc, the pivot is empty with the centre bore of fixed disk and pterygoid lamina and is overlapped.

Furthermore, a positioning ring is connected to the handrail, and a plurality of notches used for limiting are formed in the positioning ring.

Furthermore, a limiting ring is fixedly sleeved on the hinged shaft, and a stop block matched with the notch is arranged on the limiting ring.

Furthermore, the positioning ring comprises a disk body, a central round hole arranged on the disk body and a plurality of through holes uniformly distributed on the disk body, the central round hole is sleeved on a bearing positioned on the articulated shaft, and the through holes are connected with the handrail through bolts in a locking manner; the notch is arranged on the periphery of the positioning ring and comprises three independent semicircular notch openings and an elongated slot with a circumferential angle of 90-150 degrees.

Further, the first end of flange axle is connected to above-mentioned limiting plate lateral part, and the end plate is connected to the second end of flange axle, connect the lid on the end plate, the revolute pair includes flange axle, end plate and lid promptly, be equipped with the guide slot in the lid, it is equipped with the movable pulley to slide in the guide slot, be equipped with the elastic component that promotes the movable pulley in the lid, the notch is spacing with the movable pulley cooperation.

Furthermore, it is provided with the back pad to slide on the above-mentioned back assembly, be provided with linkage drive device between back pad and the linking bridge, when the back assembly rotates, the back pad slides from top to bottom along with the angle change of back assembly, the back assembly is including being fixed in the support strip on the limiting plate, be provided with the keysets of "L" type on the support strip, all be provided with the slide rail on the keysets, be provided with the slip chain link in the slide rail, erect the mounting panel between the slip chain link, the back pad sets up in the front side of mounting panel.

Furthermore, a housing is also erected between the two adapter plates, the housing and the mounting plate form an adjusting bin, and a backrest cushion positioning assembly is also arranged in the adjusting bin; the backrest cushion positioning assembly comprises a rack arranged on the rear side of the mounting plate, a rotating knob is arranged on the housing, an adjusting gear is arranged at one end, close to the backrest cushion, of the rotating knob, and the adjusting gear is meshed with the rack; the housing is provided with a fixed ring, a bearing is arranged in the fixed ring, and the rotating knob is fixedly connected with an inner ring of the bearing; the linkage driving device comprises a rotating handle, the rotating handle is fixedly connected with one end of a rotating knob, which is far away from the backrest cushion, the tail end of the rotating handle is hinged with a universal joint ball head connecting rod, and the other end of the universal joint ball head connecting rod is hinged with a connecting support; the universal joint ball head connecting rod comprises two connecting rod ball heads and a connecting rod, wherein one connecting rod ball head is connected with the connecting rod through positive threads, the other connecting rod ball head is connected with the connecting rod through negative threads, and anti-skid grains are arranged on the outer surface of the connecting rod.

The invention relates to a working method of a wheelchair with a chair back and armrests acting cooperatively, which is characterized in that: when the angle of the backrest assembly is adjusted, the rotating disc on the rotating component drives the revolute pair, the handrail assembly and the handrail to rotate along with the revolute pair, and when the rotary assembly rotates to a certain angle, the handrail does not swing along with the backrest assembly any longer due to the driving of the first connecting rod and the swing arm, but the hinge shaft and the handrail swing reversely.

If the wheelchair is not provided with the first connecting rod, the swing arm and other structures, the handrail can continuously swing along with the chair back, namely, after the chair back swings from the vertical position to the horizontal position, the handrail swings from the horizontal position to the vertical position, so that the wheelchair is very inconvenient and uncomfortable for a lying person to use, and articles (such as water of a water cup and the like) placed on the handrail are easy to overflow and topple over; just because the first connecting rod of adjustable length and the setting of swing arm, first connecting rod and swing arm form connecting rod crank mechanism, when back of the chair and handrail rotated to certain angle, receive first connecting rod, swing arm to order about, make the handrail no longer follow the back assembly and swing, but make articulated shaft and handrail reverse swing, realize user's best use comfort.

Description of the drawings:

FIG. 1 is a schematic perspective view of a first aspect of the present invention;

FIG. 2 is a perspective view of the present invention from a second perspective;

FIG. 3 is a schematic perspective partial structure view of a third perspective of the present invention;

FIG. 4 is a schematic view of the partial configuration of FIG. 2;

FIG. 5 is a schematic view of the partial configuration of FIG. 1;

FIG. 6 is a schematic sectional configuration view of a plane on which the axes of the rotation shaft and the hinge shaft are located;

FIG. 7 is a schematic perspective view of a core disc;

FIG. 8 is a schematic perspective view of the attachment bracket;

FIG. 9 is a schematic perspective view of a stopper plate;

FIG. 10 is a front view of the cage;

FIG. 11 is a schematic perspective view of the left side view configuration of the embodiment of the present invention (the sitting up and down state);

FIG. 12 is a schematic left view of the embodiment of the present invention (sitting position);

FIG. 13 is a schematic left view of the structure of the present invention (prone position);

fig. 14 is a schematic left-view structural perspective view (lying position) of the embodiment of the present invention.

The specific implementation mode is as follows:

in order to make the aforementioned features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below, but the present invention is not limited thereto.

The wheelchair with the cooperative action of the chair back and the armrests comprises a vehicle body frame 1, wherein a connecting support 2 is arranged on the vehicle body frame, a backrest assembly 3 is arranged on the connecting support 2, the backrest assembly 3 is rotatably connected with the connecting support 2 through a rotating assembly 4, and a rotating disc 5 on the rotating assembly 4 is connected with a rotating pair 7 of an armrest assembly 6, so that when the rotating disc 5 rotates, the rotating pair 7 synchronously rotates.

Rotating assembly 4 is including erectting in the pivot 12 on the linking bridge, the lateral part of pivot 12 is provided with and is used for driving pivot pivoted driving motor 13, the both ends of pivot 12 all are provided with the core disc 16 of relatively pivoted fixed disk 15 and rolling disc 5, fixed disk 15 and rolling disc 5 relatively pivoted resistance are great, consequently user's back leans on the back of the chair can not lead to the back of the chair to remove, the rolling disc and the pivot of core disc cup joint and form integrative the rotation, just can order about the relative fixed disk rotation of rolling disc under driving motor drive effect pivot effect, core disc 16 can be purchased on the market, it is often used on car seat, the automatic locking safety function on the core disc can time motion stop position to any position point.

The fixed disc 15 of the core disc is fixedly connected with wing plates 17 at two sides of the connecting support 2, the rotating disc 5 of the core disc is fixedly connected with a limiting plate 18, the backrest assembly 3 is fixedly connected with the limiting plate 18, and the driving motor is fixedly connected to the limiting plate 18.

The driving motor comprises a motor and a direction-changing and speed-changing gear driven by an output shaft of the motor to move, the direction-changing and speed-changing gear is meshed with a driving sleeve to drive the rotating sleeve on the periphery of the rotating shaft to rotate, the section of the rotating shaft is matched with an inner hole of the rotating sleeve through a key groove (the rotating shaft is a spline shaft for better driving effect), the rotating shaft is rotated, and the driving motor and the rotating shaft can be purchased on the market.

The revolute pair 7 is rotatably connected with a hinged shaft 8, the revolute pair 7 comprises a flange shaft 33, an end plate 35 and a cover body 34, one side part of the end plate is fixedly connected with the end part of the flange shaft, and the hinged shaft 8 is rotatably hinged on the other side part of the end plate.

The upper limit of 8 first sides of articulated shaft is rotated and is connected with handrail 9, and the limit of this department is rotated and is meant that handrail 9 rotates and articulates on the articulated shaft, and arbitrary angle can rotate, but receives certain turned angle's restriction, and its restriction turned angle can adopt spacing nail, spacing lug pin etc. and follow-up description adopts specific structure spacing.

The vehicle body frame 1 is also hinged with a first connecting rod 10 with adjustable length, the free end of the first connecting rod 10 is hinged with a swing arm 11 arranged on the second side of a hinge shaft 8, the first connecting rod 10 and the swing arm 11 form a connecting rod crank mechanism, so that the hinge shaft and the handrail are driven by the first connecting rod to swing reversely, the first connecting rod also plays a role of swinging the swing arm along with the rotation in the process that the seat back rotates from a vertical position to a flat position, therefore, in the process that the seat back swings flat, the handrail does not swing at the same angle along with the seat back, but is limited by the first connecting rod and the swing arm, so that the swinging process of the handrail is firstly lifted by a certain angle from a horizontal position (the first connecting rod is adjusted between 10 and 50 degrees) and then falls to the horizontal position, the handrail is repeatedly applicable by a user, when the user needs to watch TV, the seat back and the vertical position incline by 20 to 45 degrees, the back, buttock, shank use most comfortablely, and the back of the chair in this position adopts handrail and level to be the slope of 15-36 degrees simultaneously, and arm, back use is most comfortable (as shown in fig. 13), and if the handrail is easy tired, uncomfortable of use of level position, consequently, this application is favorable to promoting the use of wheelchair and experiences through the additional effect of first connecting rod, swing arm to the handrail, improves the product quality greatly.

Further, in order to realize good fixed, be provided with a plurality of first lugs 19 in the relative one side of two pterygoid lamina 17 of above-mentioned fixed disk 15 and linking bridge, be provided with a plurality of first recesses 20 that correspond with first lug 19 on the linking bridge, be provided with a plurality of second lugs 21 in the relative one side of rolling disc and limiting plate, be provided with a plurality of second recesses 22 that correspond with the second lug on the limiting plate, carry out welded fastening through first lug 19 and first recess 20, second lug 21 and second recess 22 welded fastening to the power that can make the pivot can be better transmits for the back of the chair, the pivot links firmly with the centre bore of rolling disc, the pivot is empty cover with the centre bore of fixed disk and pterygoid lamina.

Further, in order to realize the better limit rotation of the handrail 9, a positioning ring 23 is connected to the handrail, and a plurality of notches 24 for limit are arranged on the positioning ring; a limiting ring 25 is fixedly sleeved on the articulated shaft (namely, the limiting ring 25 and the articulated shaft can synchronously rotate), and a stop block 26 matched with the notch is arranged on the limiting ring 25; the positioning ring 23 comprises a disk body, a central round hole 27 arranged on the disk body and a plurality of through holes 28 uniformly distributed on the disk body, wherein the central round hole is sleeved on a bearing 29 positioned on the articulated shaft, and the through holes are tightly connected with the handrail through bolts, so that the handrail and the positioning ring can synchronously rotate; the notches are formed in the periphery of the positioning ring, the notches comprise three independent semicircular notch openings 31 and a long groove 32 with a circumferential angle of 90-150 degrees, the limiting ring 25 and the stop block 26 thereof are matched with the long groove 32 to act, and the handrail is driven to achieve the actions (firstly lifted for a certain angle and then swung flatly) through matching with the first connecting rod and the swing arm.

Furthermore, the side part of the limit plate is connected with the first end of the flange shaft 33, the second end of the flange shaft is connected with the end plate 35, the end plate is connected with a cover body 34, the revolute pair 7 comprises a flange shaft 33, an end plate 35 and the cover body 34, a guide groove 36 is arranged in the cover body, a sliding wheel 37 is arranged in the guide groove in a sliding manner, an elastic piece (the elastic piece can be a spring or an elastic rubber block) for pushing the sliding wheel is arranged in the cover body, the notch 24 is matched with the sliding wheel 37 for limiting, the bottom of the cover body is provided with an adjusting bolt for pushing the elastic piece, the sliding wheel 37 is pushed to the top by the elastic piece, the notch 24 and the sliding wheel 37 are matched and limited, the handrail can be positioned at a first position, when the user needs to go from the side and lower seat, the user applies force to overcome the elastic force of the elastic member, so that the semicircular notch 31 on the positioning ring 23 is separated from the limit of the sliding wheel 37.

If the wheelchair is not provided with the first connecting rod, the swing arm and other structures, the handrail can continuously swing along with the chair back, namely, after the chair back swings from the vertical position to the horizontal position, the handrail swings from the horizontal position to the vertical position, so that the wheelchair is very inconvenient and uncomfortable for a lying person to use, and articles (such as water of a water cup and the like) placed on the handrail are easy to overflow and topple over; just because the first connecting rod of adjustable length and the setting of swing arm, first connecting rod and swing arm form connecting rod crank mechanism, when back of the chair and handrail rotated to certain angle, receive first connecting rod, swing arm to order about, make the handrail no longer follow the back assembly and swing, but make articulated shaft and handrail reverse swing, realize user's best use comfort.

When the chair is in a sitting posture state, the left and right armrests can be opened from the side edge and can be pulled upwards and turned over to align the backrest when people get off the chair, and people can get on or off the chair conveniently and feel safe.

When the backrest is in a process of sitting to lying, the driving motor rotates the backrest backwards to lie flat, the rotating shaft is driven to rotate by the driving motor, the rotating disc and the limiting plate, both ends of which are connected with the core disc, are driven to rotate by the rotating shaft, the limiting plate fixes the backrest assembly, and the backrest assembly and the limiting plate are connected with the revolute pair to realize synchronous rotation of the revolute pair; when the driving motor rotates the backrest backwards to lie flat, the first connecting rod (which is a universal joint ball head connecting rod) fixedly arranged on the vehicle body frame is hinged to the swing arm, the other end of the first connecting rod is hinged to the swing arm, and in the process of lying flat, the first connecting rod and the swing arm drive the armrest to move, namely, the armrest moves in the process of lying flat and is cooperatively generated by two aspects.

In this embodiment, a linkage driving device is arranged between a back cushion and a connecting bracket on a back assembly 3, when the back assembly rotates, the back cushion moves up and down along with the angle change of the back assembly, the back assembly comprises bracket strips 39 fixed on limiting plates 18, the two limiting plates are respectively provided with the bracket strips, the two bracket strips are correspondingly arranged, the bracket strips are provided with an "L" -shaped adapter plate, the adapter plates 40 are respectively provided with a slide rail 41, the slide rail is internally provided with a slide chain link 42, the slide chain link freely slides in the slide rail, a mounting plate 43 is arranged between the slide chain links, a housing 44 is arranged on a fixed frame between the two adapter plates, the housing and the mounting plate form an adjusting bin, and a back cushion positioning assembly is also arranged in the adjusting bin; the backrest cushion is arranged on the front side of the mounting plate, and can slide up and down on the slide rail through the structure, namely the backrest cushion slides up and down relative to the housing 44 connected with the limiting plate.

In this embodiment, back pad locating component is including setting up in rack 45 of mounting panel 43 rear side, the vertical setting of rack, be provided with the rotation knob (the rotation body of rod) on the housing, rotate the knob and rotate with the housing and be connected, one side that the rotation knob is close to the back pad is provided with adjusting gear 47, adjusting gear and rack mesh mutually, and through the meshing position of adjusting gear and rack, the adjustment of realization mounting panel position, and then realize the position control of back pad.

In this embodiment, in order to realize the rotation connection of the rotation knob and the housing, a fixing ring 48 is fixedly arranged on the housing, a bearing is arranged in the fixing ring, and the rotation knob is fixedly connected with an inner ring of the bearing, that is, the rotation knob can rotate relative to the housing.

In this embodiment, the linkage driving device includes a rotating handle 49, the rotating handle 49 is fixedly connected with one end of a rotating knob away from the backrest cushion, the rotating handle can drive the rotating knob to rotate through rotation, and then the adjusting gear 47 rotates, so that the lifting of the rack is realized, and the position adjustment of the backrest cushion is realized, the tail end of the rotating handle 49 is hinged with a universal joint connecting rod 50, and the other end of the universal joint connecting rod is hinged with the connecting support 2.

In this embodiment, in the process of moving the backrest from the vertical position to the lying position, the backrest cushion moves towards the cushion, and due to the user with inconvenient movement, the back does not have any force or the back has sores or the like, and through the process of tilting the backrest downwards, the backrest cushion moves towards the cushion, so that the friction between the back of the user and the backrest is reduced.

In this embodiment, universal joint bulb connecting rod includes two connecting rod bulbs and a connecting rod, and one of them connecting rod bulb passes through orthodontic threaded connection with the connecting rod, and another connecting rod bulb passes through anti-thread threaded connection with the connecting rod, can set up locknut for avoiding becoming flexible, the surface of connecting rod is provided with anti-skidding line, adjusts the wheelchair as required to when adapting to different users, can realize the initial adjustment to the back pad position through rotating the connecting rod, and the adjustment is once after, does not need readjustment again, and first connecting rod structure is also like this universal joint bulb connecting rod.

When the backrest angle adjusting device works, when the backrest angle needs to be adjusted, the driving motor drives the rotating shaft to rotate, and the rotating shaft drives the limiting plate and the support strip to rotate, so that the mounting plate, the housing and the backrest cushion rotate together; because the angle and the position of the housing change, the distance between the rotating handle and the connecting support also changes, and the rotating handle starts to rotate under the action of the universal joint ball head connecting rod, so that the rotating knob rotates, the adjusting gear rotates, the lifting of the rack is realized, the position of the backrest cushion is adjusted, and the waist of a user leans against the backrest cushion in the whole conversion process without additional adjustment.

It will be apparent to those skilled in the art that various wheelchair with cooperative back and arm rest and method of operation can be devised without inventive skill based on the teachings of the present invention, and that various changes, modifications, substitutions and alterations can be made without departing from the spirit and scope of the invention.