CN214018182U

CN214018182U - Multifunctional wheelchair

Info

Publication number: CN214018182U
Application number: CN202022717996.1U
Authority: CN
Inventors: 许国志; 许海峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-23
Filing date: 2020-11-23
Publication date: 2021-08-24
Anticipated expiration: 2030-11-23

Abstract

The utility model relates to a multifunctional wheelchair, which comprises a seat, a walking mechanism and a driving unit, wherein the seat comprises a deformable seat frame, an adjustable seat surface, a backrest and a front and back telescopic adjusting support rod; the deformable chair frame comprises an upper beam, a bottom beam, a front upright post and a rear upright post, wherein the front upright post and the rear upright post are hinged with the upper beam and the bottom beam; the walking mechanism comprises a front wheel, a rear wheel, a front crawler belt assembly, a rear crawler belt assembly and a flat ground walking mode self-locking device; the joint of the front and rear crawler assemblies coaxially rotates; a front telescopic adjusting support rod is connected between the front upright post and the bottom beam, a rear telescopic adjusting support rod is connected between the upper beam and the rear crawler assembly, a mode conversion operating rod is connected at the joint of the front upright post and the front and rear crawler assemblies, and a seat angle stabilizing adjuster is connected between the upper beam mounting frame and the rear crawler assembly; the driving unit comprises a power unit, a speed change transmission mechanism, a speed change clutch mechanism and a mode conversion clutch. The utility model discloses have the level land walking concurrently, climb stair and cross-country ability, travelling comfort, security are good, strengthen the indoor outdoor independent mobility ability of the inconvenient crowd of action.

Description

Multifunctional wheelchair

Technical Field

The utility model relates to a wheelchair, in particular to a multifunctional wheelchair.

Background

The existing wheelchairs comprise common hand-push wheelchairs and electric wheelchairs which run on the flat ground, electric wheelchairs/stair climbing machines which can climb stairs, full-intelligent control wheelchairs which can run on the flat ground and can go up stairs and steps, full-caterpillar wheelchairs which have certain complex terrain cross-country capability, and the like.

The wheelchair/stair climbing mechanism with two functions of walking on flat ground and climbing stairs in the market at present adopts one section of crawler chair to be installed downwards or installed after a chair is installed, one telescopic rod controls mode conversion, and no automatic seat balance adjusting device is provided. The biggest defects of the wheelchair are that:

A. when a healthy person is required to operate to stably go up and down stairs, an operator is manually responsible for the stable transition of the angle of the seat when going up to the last step or going down to the first step. Otherwise, the rider will have a large angle of abrupt transition and contact with the ground when he goes up to the last step.

B. From the selection of the upstairs and downstairs mode, the rider cannot sit on the seat comfortably and lies on the wheelchair half-way and continuously changes the angle of lying on his back with the change of the upstairs and downstairs and the change of the angle of stairs.

C. When the chair is in the mode of going upstairs and downstairs, the telescopic rod extends out of the front end of the chair to face upwards, and the angle is changed to the position that the rear wheels exceed the height of the crawler belt. The height between the front end of the chair and the steps and the ground is increased, the legs of a user are suspended, and the chair is supported by the telescopic rod and swings between the steps to greatly increase the unsafe feeling of the user.

D. The upper step and the lower step can not be operated in a direction; the power device has single function, simple control and the like.

In recent years, some patented technical designs improve the balance and the corresponding structure of the seat when climbing stairs, but the comprehensive analysis has the following problems:

A. some seats are unstable in balance structure like suspension: when walking, the seat rushes forward and shakes forwards and backwards due to obstacles, brakes or sudden posture changes. Most of the seats are independently controlled in a balanced manner, so that the cost is improved, and the weight and the control difficulty are increased.

B. In the prior art, the transition treatment from the upper step to the lower step to the last step is carried out manually, and some transition mechanisms are required to stop driving and then operate, so that the operation difficulty and unsafe factors of disabled people are increased, and automatic and stable transition cannot be realized.

C. The prior art realizes the running on steps by the elasticity of the crawler belt and the design of patterns, and lacks the safety guarantee.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to overcome above-mentioned prior art not enough, and provide a have the level land walking concurrently, climb the stair and have the multi-functional wheelchair of certain complicated topography cross-country ability, its travelling comfort, security are good, are showing the indoor outdoor independent ability of moving of reinforcing mobility-handicapped crowd, improve their quality of life, alleviate the burden of service personnel for it.

In order to solve the technical problem, the utility model discloses a technical scheme does:

a multifunctional wheelchair is designed, which comprises a seat, a traveling mechanism and a driving unit, wherein the seat comprises a deformable seat frame, an adjustable seat surface, an adjustable backrest and a front-back telescopic adjusting support rod; the deformable chair frame comprises an upper beam, a bottom beam, a front upright post and a rear upright post which are arranged in pair from left to right, and the left and the right and the front upright posts are correspondingly hinged with the upper beam and the bottom beam through connecting shafts;

the walking mechanism comprises a front wheel, a rear wheel, a front crawler assembly, a rear crawler assembly and a flat ground walking mode self-locking device; the front wheel is hinged on the front upright post, the rear wheel is rotatably connected on the rear upright post, and the joint of the front crawler assembly and the rear crawler assembly is jointly rotatably connected on a connecting shaft between the rear upright post and the bottom beam;

a front telescopic adjusting support rod is connected between the front upright post and the bottom beam, a rear telescopic adjusting support rod is connected between the upper beam and the rear track assembly, a mode conversion operating rod is connected at the joint of the front upright post, the front track assembly and the rear track assembly, and a chair surface angle stabilizing adjuster is connected between the mounting frame where the upper beam is located and the rear track assembly;

the drive unit comprises a power unit, a speed change transmission mechanism, a speed change clutch mechanism and a mode conversion clutch.

Preferably, in the above multifunctional wheelchair, the rear end of the adjustable seat is hinged to the upper beam, and a seat angle adjuster is arranged between the front end of the adjustable seat and the upper beam; the chair surface angle regulator comprises a mounting rack, an adjusting screw rod, a nut and an adjusting hand wheel/motor; an adjustable connecting shaft is arranged between the adjustable backrest and the upper beam;

the damping device also comprises a front pedal, wherein a movable shaft, a rubber block and a rubber roller are arranged on the front pedal, and a damping spring is arranged between the front pedal and the rubber roller; and a flat ground running damping spring is also arranged between the bottom beam and the rear upright post, and is contacted with the rear upright post in a flat ground running mode.

Preferably, in the above multifunctional wheelchair, an axial distance between the front upright post and the center of the connecting shaft corresponding to the upper beam and the bottom beam is greater than an axial distance between the rear upright post and the center of the connecting shaft corresponding to the upper beam and the bottom beam, so that when the wheelchair is in a stair mode, the front of the seat surface is high and the rear is low, and the seat surface has a certain gradient, so that a rider can be prompted to lie backwards to lean the center of gravity backwards, and a forward-turning accident is prevented;

the rear upright post is provided with a spring leaf for damping, and the rear upright post part where the spring leaf is positioned is in contact with the upper beam to provide support in a stair mode;

a stair mode horizontal measurement and control pipe is arranged on the mounting frame where the upper beam is located; the adjustable chair surface is also provided with a stair mode safety detection horizontal pipe; the stair mode horizontal measuring and controlling pipe and the stair mode safety detection horizontal pipe are both of V-shaped structures.

Preferably, in the above multifunctional wheelchair, the flat ground walking mode self-locking device comprises a front and rear wheel walking mode locking mechanism and a front crawler assembly resetting locking mechanism; the front wheel walking mode locking mechanism comprises a flat walking locking reed and a limit locking plate, wherein the fixed end of the flat walking locking reed is installed on an installation arm where a front wheel is located, and the free end of the flat walking locking reed is in plug-in fit with the limit locking plate arranged on a bottom beam to realize locking and positioning;

the rear wheel walking mode locking mechanism and the front track assembly resetting locking mechanism comprise steel cables, a rear wheel flat ground mode safety locking hook, a front track assembly resetting safety locking hook, a bottom beam and front track locking hook, a locking opening block and a locking resetting spring; one end of the steel cable is connected with the mode conversion operating lever, and the other end of the steel cable penetrates through the connecting shaft at the rear side of the bottom beam and is sequentially connected with the locking reset spring, the rear wheel flat ground mode safety lock hook and the front track assembly reset safety lock hook; meanwhile, the rear wheel flat land mode safety lock hook and the front track assembly reset safety lock hook are hinged to the bottom beam, the rear wheel flat land mode safety lock hook is matched and locked with the boss on the rear upright post, the front end hook part of the front track assembly reset safety lock hook is matched with a front wheel axle of the front track assembly, and the rear end of the front track assembly reset safety lock hook is provided with a bulge matched with a locking opening block arranged on the front track assembly to realize locking or unlocking.

Preferably, in the multifunctional wheelchair, the power unit is a power motor;

the speed change transmission mechanism comprises a clutch transmission case positioned on the rear upright post, and a stair speed fixing convex strip, a cross-country speed fixing convex strip, a stair cross-country mode fixing boss, a flat ground mode fixing boss, and a clutch plate and a driving gear which are respectively corresponding to the stair speed fixing convex strip, the cross-country speed fixing convex strip, the stair cross-country mode fixing boss and the flat ground mode fixing boss are;

the speed-changing clutch mechanism comprises a switching rod, a change gear connected with a front speed-regulating disc and a rear speed-regulating disc, a stair speed boss, a cross-country speed regulating boss and a tension spring connected to the rear upright post and used for providing downward pressure for the change gear;

the mode conversion clutch comprises a conversion pressure column, a flat land mode clutch switching movable boss, a stair/cross-country mode clutch switching boss, a clutch plate mounting shaft and a tension spring which is fixed on the gearbox and provides tension for switching stair modes.

Preferably, in the above multifunctional wheelchair, the bottom beam is provided with a push wheelchair/electric drive selection knob, a selection cam and a top post at the same time, wherein the selection cam is rotatably connected to the bottom beam through a wheel axle, the selection knob is embedded in the wheel axle, the top post is embedded in the bottom beam and is positioned right above the selection cam, and the selection cam surface is abutted against the lower end surface of the top post;

when the wheelchair needs to be pushed in a flat ground mode, the cam bulge of the selection knob is in a horizontal state, the conversion pressure column and the jacking column are both pressed down under the action of the tension spring to drive the flat ground mode clutch switching lug boss and the flat ground mode fixing convex strip to be separated, and the corresponding clutch plate is driven to be separated from the driving gear, so that the pushing function is realized;

when the electric driving is needed, the hand-push wheelchair and the electric driving selection knob select the cam to be rotated to be in a vertical state, the pressing is switched, the jacking column is jacked up, so that the flat land mode clutch switching lug boss and the flat land mode fixing lug rib are overlapped, and the corresponding clutch plate is pushed to be combined with the driving gear, so that the electric driving function is realized.

Preferably, in the above multifunctional wheelchair, the lower end of the rear upright post is provided with an anti-overturn mechanism; the anti-turnover mechanism comprises an anti-turnover rod, wherein one end of the anti-turnover rod is provided with an anti-turnover wheel, the other end of the anti-turnover rod is provided with a turnover driving mechanism, and the end of the anti-turnover rod is provided with a retraction locking knob;

the overturning driving mechanism comprises a driving gear, a speed change gear and a speed increasing gear, wherein the speed change gear and the driving gear are coaxially arranged, and the speed increasing gear is matched with the speed change gear for meshing transmission; the driving gear and the bottom beam are in matched meshing transmission with a gear.

Preferably, the multifunctional wheelchair further comprises an instantaneous regulator, wherein the instantaneous regulator comprises a cylinder body with an opening at one end, an adjusting and damping spring and a triggering magnetic block are arranged in the cylinder body, and a magnetic control hall switch is arranged on the surface of the cylinder body; the closed end of the cylinder is hinged to the rear crawler assembly, the open end of the cylinder is sleeved with the end part of the seat surface angle stabilizing adjuster in a sliding mode, and the triggering magnetic block is arranged between the damping spring and the end part of the rod-shaped seat surface angle stabilizing adjuster.

Preferably, in the multifunctional wheelchair, the front track assembly comprises a front track inner and outer side guard plate, a front track transmission driving gear, a front track transmission pair wheel, a rubber wheel rotating with the pair wheel, a front track transmission driven wheel and a front track speed regulation disc;

the rear crawler assembly comprises inner and outer side guard plates of a rear crawler, a rear crawler transmission driven wheel and a rear crawler speed regulation disc; two pairs of clutch separation grooves of the front and rear crawler belt speed regulation discs are correspondingly arranged on the crawler belt guard plate respectively relative to the front and rear crawler belt speed regulation discs;

the front and rear crawler belt speed regulation discs rotate along with the front and rear crawler belts, when the front crawler belt is horizontal to the ground, and the rear crawler belt is folded to be vertical to the ground, one pair of speed regulation disc clutch separation grooves are overlapped, a change wheel of the speed change clutch mechanism is clamped in the pair of speed change disc clutch separation grooves under the action of a tension spring, and the stair boss and the cross-country boss are driven by the switching rod to be separated from the stair fixing convex strip and the cross-country fixing convex strip, so that the front and rear crawler belts are separated from the drive;

when the front crawler belt is horizontal to the ground and the rear crawler belt is also horizontal to the ground, the other pair of clutch and separation grooves of the speed adjusting disc are overlapped, so that the stair bosses are separated from the stair fixing raised lines, and the cross-country bosses are combined with the cross-country fixing raised lines to complete the switching of the cross-country speed;

when the front and rear tracks do not form the above conditions, the two pairs of clutch separation grooves of the speed regulation disks are not overlapped, and the speed change wheels are positioned on the outer peripheries of one or two of the front and rear track speed regulation disks, so that the stair bosses are overlapped with the stair fixing raised lines to separate the cross-country bosses from the cross-country fixing raised lines to complete speed switching in a stair mode;

the front end of the front crawler assembly is provided with a speed reduction sensor and a speed reduction triggering magnetic block which are paired, and the front crawler assembly is matched with electrical control to provide settable fixed safe speed for terrain and road surface change transition.

Preferably, in the above multifunctional wheelchair, the front crawler assembly and the rear crawler assembly are respectively provided with a front auxiliary wheel and a rear auxiliary wheel; the extension end of the front auxiliary wheel is hinged with a front auxiliary wheel extension arm and an extension arm extension spring, and meanwhile, a damping spring driving block, a forced reset shaft during flat ground running, a front auxiliary wheel extension torsion spring, a front auxiliary wheel damping spring and a front auxiliary wheel corner damping limiting block are arranged on the front auxiliary wheel;

the rear auxiliary wheel comprises a driving wheel, a ground contact supporting wheel and a transmission belt; the ground contact supporting wheel is provided with a magnetic control sensor and a magnetic control sensor triggering magnetic block in pair, and a matching circuit provides safety alarm prompt and safety protection control;

and the transmission belts of the front crawler assembly and the rear crawler assembly are respectively provided with an angle-adjustable crawler auxiliary supporting wheel.

The utility model discloses technical scheme's beneficial technological effect is:

structurally, the multifunctional wheelchair of the utility model adopts a variable chair frame structure which keeps the angle of the chair surface unchanged and enables the front and back high and low positions of the wheelchair to deform according to different functions and running requirements; the crossing running of various complex road surface terrains is self-adapted by adopting a front section and a rear section of coaxial driving type tracks, a front auxiliary wheel and a rear auxiliary wheel, a pneumatic telescopic adjusting support rod and an electric adjuster for stabilizing the angle of a chair surface; by utilizing different functional characteristics of the wheelchair, the mode conversion clutch and the speed change clutch mechanism are matched with the speed regulation clutch grooves on the front and rear crawler guard plates, and the driving requirements of four speeds, namely flat ground running, stair step running, cross-country beach running and the like and step obstacle excess speed when running on different roads and stairs under different modes are automatically controlled; the adoption of the speed reduction sensor realizes the stable transition of automatic downstairs without special operation, thereby improving the safety guarantee.

Moreover, structurally the utility model discloses a simple mechanical structure and a small amount of electrical control components and parts have reduced manufacturing cost, have realized the service function, can satisfy user's in general demand, easily popularize.

To sum up, the utility model discloses improved the range of action and trip and independent self-care condition of disabled person, handicapped person, old person greatly, improved their quality of life, alleviateed family and social burden, the social is showing.

Drawings

The following detailed description of embodiments of the invention is provided with reference to the accompanying drawings, in which:

FIG. 1 is a schematic structural view of the multifunctional wheelchair in a flat ground mode;

FIG. 2 is a schematic structural view of the multifunctional wheelchair in a stair climbing mode;

FIG. 2-1 is a schematic structural view of the first transition state of the multifunctional wheelchair on the upstairs and downstairs;

FIG. 2-2 is a schematic structural view of the multifunctional wheelchair in a transition state of going upstairs and downstairs;

FIG. 3 is a schematic structural view of the multifunctional wheelchair in the cross-country mode or lying down function;

FIG. 4 is a schematic structural view of the multifunctional wheelchair in an obstacle crossing state;

FIG. 5 is a schematic structural view of the shift clutch mechanism;

FIG. 6 is a schematic diagram of the mode shift clutch;

FIG. 7 is a schematic block diagram of the control part of the multifunctional wheelchair of the present invention;

Detailed Description

In the following, the accompanying drawings in the present invention will be combined to clearly and completely describe the technical solutions in the embodiments of the present invention, and it is obvious that the described embodiments are only schematic partial embodiments of the present invention, and are not used to limit the scope of the present invention, and any person skilled in the art should belong to the protection scope of the present invention without departing from the equivalent changes and modifications made by the present invention under the premise of the concept and principle of the present invention.

Examples

Referring to fig. 1-7, 2-1 and 2-2, the multifunctional wheelchair of the present invention is a chair frame structure composed of a deformable frame, wherein the normal running seat is kept horizontal (or the adjustable angle is 0-5 degree in height from front to back), the step running is automatically adjusted and kept to the set angle of height from front to back (5-10 adjustable angle), and the height of the front seat surface is 0-10cm from top to bottom and the front and back are 0-40cm from front to back; the walking mechanism under different modes consists of a front small wheel, a rear big wheel, a front crawler belt and a rear crawler belt; the requirements of different driving functions are fulfilled by a power motor, a clutch and a variable speed transmission mechanism; the mechanical control of different mode conversion and various driving states is completed by devices such as an electric telescopic regulator, a pneumatic rod, a linkage guide rod, a damping spring, a torsion spring, a reset spring, a limit device and the like; the seat front and back balance adjustment and guarantee system is used for completing the conversion of different modes by an electric regulator for stabilizing the seat angle, a pneumatic automatic telescopic rod, a rear auxiliary wheel, an instantaneous regulator, a horizontal detection pipe and the like, and is used for ensuring the front and back balance adjustment of seats on stairs with different angles and terrains with different gradients; the safety control and alarm system for stable running is composed of a self-locking device of front and rear wheels, a front and rear crawler reset locking mechanism, an anti-overturning wheel, a front auxiliary wheel, a rear auxiliary wheel, an electromagnetic brake, automatic balance control, magnetic control, light control and a micro-sensor switch; and the monitoring control system is composed of a singlechip, a control mainboard and the like.

Specifically, the distance between the front upright post 2 and the lower shaft 205 from the center of the upper shaft 101 is about 2cm longer than the distance between the rear upright post 3 and the lower shaft (integrated with the clutch gearbox) 402 from the center of the upper shaft 102, so that the front height and the rear height of the seat are formed in a stair mode, and the balance adjustment is controlled to be 6-8 degrees in a slope of 5-9 degrees. The seat can be adjusted to a horizontal position when the vehicle runs in a flat ground mode, and the seat is out of balance in front and back to cause forward overturning accidents on steps due to the fact that the gravity center of the seat is close to the front when the vehicle runs in a stair mode and because the weight ratio of the upper body to the lower body of a person and the sitting posture of the person are different and the sitting posture of the person is suddenly changed. Thus, when switching to the stair mode, the high front to low rear slope of the seat surface encourages the rider to lean back in the center of gravity, preventing this accident.

The spring leaf 301 of the rear upright post 3 provides a vertical stress supporting point of the chair frame upper beam 1 in the stair mode, and increases the stability and shock absorption of the chair frame.

The installation angle of the horizontal measurement and control tube 43 should be in a horizontal state when the chair frame rotates by about 22 degrees, so as to avoid that the rear end trigger point 432 is too low to enable the chair surface angle stability adjuster 8 to continuously extend out to cause the front end of the bottom beam 4 of the chair frame to touch the ground and lift the spindle 402 after entering the automatic balance adjustment program. Lowering the front trigger point 431 below the rear point 432 at around 20 degrees ensures that the rear tracks 30 are retracted when transitioning from stair mode to flat ground mode. And the horizontal angle between the front end 431 and the midpoint of the level vial 43 after completion of the mode switch cannot be greater than 4 degrees.

The requirement of the installation angle of the front and rear points of the safety detection horizontal pipe 42 in the stair mode is that the front point 421 is higher than the rear point, and is not less than 4 degrees and not more than 5 degrees. The function is firstly that the angle of the adjustable chair surface 40 designed for the lying function and the cross-country function is kept to be more than 1 degree when the angle is parallel to the upper beam of the chair frame. Secondly, when the adjustment is out of control or the sitting posture is changed, the front point 421 is lower than the rear point 422 to cause an alarm. The alarm not only reminds people to lie and sit backwards quickly, but also interrupts the driving motor 10 and needs to get rid of problems and recover manually.

Anti-overturn mechanism 16 and implementation process: the drive gear 163, which is integrated with the clutch gear, is engaged as a moving tooth with the gear 403 fixed to the bottom beam as a stationary tooth, and the moving tooth rotates around the stationary tooth. When rotating downward, the moving teeth 163 and the speed change gear 162 coaxial therewith rotate clockwise and the speed increase gear 161 engaged with the speed change gear rotates counterclockwise, thereby driving the anti-tip-over lever 164 fixed coaxially to rotate upward.

Front and rear tracks: the front pneumatic support rod 9 enables the front crawler belt to automatically cling to steps at various angles or the ground under the control of the seat angle stabilizing regulator 8, and the function of supporting the front end of the wheelchair is achieved. The rear crawler 30 mainly supports the weight of the rear end of the wheelchair by the seat angle stabilizing adjuster 8, and the rear gas strut 17 assists in supporting and has a shock absorbing function with the spring 123 in the instantaneous adjuster. The front and rear auxiliary support wheels 25 and 35 have small-angle adjustment capability, when the crawler presses on the step angle, the auxiliary wheel close to the angle rotates towards the upper part of the crawler due to different stress, and the other far auxiliary wheel rotates towards the lower part of the crawler, so that an S-shaped wrap angle is formed on the surface of the crawler on the top angle of the step, the wheelchair is prevented from sliding downwards, the running stability of the wheelchair on the step is improved, and the top angle of the step is protected.

Specifically, the front auxiliary wheel: the main function is to ensure that the wheelchair cannot automatically slide down from the steps under any condition. When the front crawler 20 is horizontal to the ground, the flat traveling return shaft 234 is pressed down by the bottom beam 4, and the front auxiliary wheel is forcibly retracted above the front crawler without affecting traveling on terrains such as flat ground, sand beach, and grassland. When the front crawler rotates downwards, the front auxiliary wheel is driven to extend downwards under the action of the front auxiliary wheel extension torsion spring 235, and when no obstacle exists, the damping spring driving block 233 contacts the starting point of the damping block and then correspondingly acts according to the upper step or the lower step.

Specifically, the rear auxiliary wheel: the main effects are that when the wheelchair reaches the last step, the rear section of the crawler 30 loses the supporting point, the wheelchair gradually loses balance and turns backward, when the rear crawler shaft of the rear auxiliary wheel 32 is 15-18cm away from the ground, the rear auxiliary wheel independent supporting groove 326 is clamped in the rear auxiliary wheel independent supporting key 331 under the action of the rear auxiliary wheel stretching torsion spring 325, the ground contact supporting wheel 324 is supported and stably transited in a ground contact mode, and the wheelchair can stably and self-adapt to the change of the step. When the wheelchair descends the stairs, the rear auxiliary wheel and the ground contact supporting wheel 324 are hooked on the stairs under the action of the rear auxiliary wheel adjustable damping spring 333, so that the wheelchair does not slide downwards and also plays a role in smooth transition.

Specifically, the speed regulating mechanism: the crawler belt outer guard plate comprises a clutch gearbox 13, a speed change clutch mechanism 15, and front and rear crawler belt outer guard plates 21 and 31 which are connected with one end of a main shaft 402 and are provided with speed regulating discs 27 and 37.

The speed-adjusting discs 27 and 37 rotate along with the front and rear caterpillar bands 20 and 30, when the front caterpillar band is horizontal to the ground and the rear caterpillar band is folded to be perpendicular to the ground, the clutch separation grooves 271 and 371 are overlapped, the speed-changing wheel 152 of the speed-changing clutch mechanism 15 is clamped in the clutch separation grooves 271 and 371 of the speed-adjusting discs under the action of the tension spring 155, the switching rod 151 drives the stair boss 153 and the cross-country boss 154 to be separated from the cross-country fixing convex strip 132 of the stair fixing convex strip 131 to drive the respective clutch plates to be separated, and therefore the front and rear caterpillar bands are separated from driving.

When the front crawler 20 is horizontal to the ground and the rear crawler 30 is also horizontal to the ground, the

clutch separation grooves

272 and 372 of the speed regulation disc are overlapped, so that the stair boss 153 is separated from the stair fixing raised line 131 to drive the clutch disc to separate, and the cross-country boss 154 and the cross-country fixing raised line 132 are combined to push the clutch disc to engage to complete the switching of the cross-country speed.

When the front and rear tracks are not formed under the above conditions, the

clutch separation grooves

271, 371 and 272, 372 of the speed regulation discs are not overlapped, and the speed change wheel 152 must be positioned on the outer periphery of one or both of the front and rear speed regulation discs 27 and 37, so that the stair boss 153 and the stair fixing convex strip 131 are overlapped to push the clutch plate to be engaged, the cross-country boss 154 and the cross-country fixing convex strip 132 are separated to drive the clutch plate to separate, and the speed switching under the stair mode is completed.

Specifically, the mode switching clutch: the device comprises a mode conversion clutch 14 in a clutch gearbox 13, a conversion pressure column 141, a top column in a chair frame bottom beam 4, a hand-push wheelchair, an electric drive selection knob 405, a selection cam 406 and the like.

Flat ground running mode: when the wheelchair needs to be pushed in the flat ground mode, the cam 406 is horizontally arranged at the convex position of the selection knob, the selection knob is switched to press 141 under the action of the tension spring 145, the top column 407 is pressed down to drive the flat ground mode clutch switching boss 142 and the flat ground mode fixing convex strip 134 to separate, and the clutch plate is driven to separate from the driving gear, so that the function of pushing the wheelchair is realized. In this state, although the stair cross country mode switching boss 143 overlaps the stair mode fixing rib, the cross country boss 154, the stair boss 153, and the fixing

ribs

131 and 132 in the speed change clutch and mechanism are all in a separated state, so even if the motor 10 is started by mistake, only the gear in the clutch transmission idles, and no accident is caused.

When the electric driving is needed, the hand-push wheelchair and the electric driving selection knob 405 select the cam 406 to be rotated to the vertical state, the switch pressing 141 and the jacking column 407 are jacked up, so that the flat ground mode clutch switching boss 142 and the flat ground mode fixing convex strip 134 are overlapped, and the clutch plate is pushed to be combined with the driving gear, thereby realizing the electric driving function.

Stair or cross-country mode travel: when the clutch transmission case 13 is horizontally separated from the sill 4 when in the stair or cross-country mode, the switching pressure 141 is pressed to the bottom by the tension spring 145, the land mode clutch switching movable boss 142 is separated from the land mode fixed boss 134, and the stair and cross-country mode clutch switching boss 143 overlaps with the stair and cross-country mode fixed boss 133, so that the mode switching clutch is in the stair mode.

Specifically, the transient regulator: when the last step is finished, due to the fact that included angles between the stair steps and the ground are different, the front and rear balance points of the wheelchair are uncertain, the ground clearance of the rear auxiliary wheel 32 is uncertain, and the larger the angle is, the larger the ground clearance of the rear auxiliary wheel 32 is. After passing through the balance point, the wheelchair turns backwards, and the adjustment length of the seat and the rear crawler is limited by the adjustment speed of the seat angle stabilizing adjuster 8 and cannot be instantly adjusted, so that the wheelchair turns backwards at a large angle to cause unsafe feeling. The instantaneous regulator 12 is used for rapidly prolonging the rear auxiliary wheel by about 1-3 cm under the action of the spring 123 in the regulator 12 and the rear pneumatic support rod 10 when the rear crawler of the wheelchair loses the support point to reach the moment of backward overturning, so that the rear auxiliary wheel can reach stable transition by contacting with the ground in time, and soft landing is realized.

Specifically, the deceleration sensor: after being triggered, the wheelchair running speed is forcibly reduced to 2-5cm per second, and after being triggered, the wheelchair is automatically delayed for 10 seconds to be released.

When in specific use, the utility model discloses the function of following three kinds of modes can be realized to multi-functional wheelchair at least: A. a land leveling mode; B. a stair mode; C. off-road mode.

1. Land leveling mode: the operation panel is provided with a (flat ground) key; the multifunctional wheelchair has the functions of common hand push and electric wheelchairs and is suitable for driving indoors and outdoors on flat ground and on small-gradient slopes.

2. Stair mode: the operation panel is provided with (stair) keys; the mode is mainly that the front and rear crawler belts change along with the change of the gradient of the step, so that the seat is always kept in a balanced state. The stair is suitable for being independently operated on steps with the angle not larger than 40 degrees, and can cope with stair steps with various angles indoors and outdoors through assistance of people. The mode can also be used for getting rid of difficulties and overcoming road obstacles.

3. Off-road mode: the operation panel is provided with (cross-country) keys: (with the stair mode only can manually pack up the rear jockey pulley) the front and back track is horizontal with the ground and automatic gear shift is in high-speed gear under this mode. Mainly runs on the roads of sandy beach, grassland, ice, snow and muddy.

The utility model discloses mode conversion process is as follows when specifically traveling:

1. flat ground to stair mode conversion: (refer to FIG. 1, FIG. 2-1)

Mainly comprises a mode conversion rod 7, a balance chair surface angle stabilizing regulator 8 and a horizontal measuring and controlling pipe 11. When the mode is switched, the rear auxiliary wheel needs to be retracted into the reset groove 327 and pulled out of the independent support positioning key 331, otherwise (the magnetic control sensor triggers the magnetic block 329 and the magnetic control sensor 311 to coincide) an alarm is given and the mode is stopped.

And (3) conversion process: by pressing the stair mode operation key, the mode switching lever 7 is started to retract and the seat angle stabilizing adjuster 8 is started to extend. The mode conversion rod 7 retracts to pull the steel cable 191 of the self-locking device 19 to drive the rear large wheel safety lock 29 and the front crawler belt resetting lock 28 to unlock, the rear upright post 3 of the chair frame, the upper beam 1 of the chair frame, the rear large wheel 6, the clutch transmission 13 and the rear crawler belt 30 rotate backwards by taking the main shaft 402 as a center, meanwhile, the front upright post 2 of the chair frame and the front small wheel 5 are driven to rotate by taking the front upright post and the bottom beam connecting shaft 205 as a center, and the conversion process is finished until the mode conversion rod 7 triggers the self-contained retraction limit switch when the angle reaches 45-50 degrees.

The state after the stair mode conversion is completed:

the conversion rod 7 retracts to the right position, the self-locking shock absorption 19 is pulled out, the front crawler safety lock 28 and the rear wheel safety lock 29 are unlocked, the reed 301 in the rear upright post 3 is stressed, the supporting force of the conversion rod 7 is dispersed and lightened, the self-locking mechanism of the conversion rod 7 is protected, and the shock absorption effect under the mode is achieved.

The front caterpillar band 20 is horizontal to the ground, the forced reset shaft 234 is forced to reset when the front auxiliary wheel 23 runs on the flat ground, the independent support positioning groove 326 of the rear auxiliary wheel 32 is positioned in the positioning key 311, and the rear caterpillar band 30 forms an included angle of about 20 degrees with the ground.

2. Switching from the stair mode to the flat ground mode: (refer to FIGS. 2 and 2-2.)

When the flat ground mode switching rod 7 is pressed to extend, the wheelchair frame and related parts rotate forwards, the chair surface angle stabilizing regulator 8 carries out automatic balance control along with the change of the chair surface angle stabilizing regulator, until the center of gravity of the chair is forward through a front balance point and a rear balance point, and when the midpoint of the front point of the horizontal measuring and controlling pipe 43 is horizontal, the rear crawler belt 30 is taken away from a supporting point, the horizontal measuring and controlling pipe 43 is not controlled by the extension and retraction of the chair surface angle stabilizing regulator 8 any more, and the mode is switched to about 20 degrees, and the front point 431 is always lower than the midpoint 433, so that the chair surface angle stabilizing regulator 8 can only retract until the touch limit switch 11 stops. The mode conversion is completed until the mode conversion rod 7 is pressed by the limit switch with the extension and the limit shock absorption rubber block of the front upright post and the front small wheel 5 and the locking reed 501 are locked. At this time, the spring in the self-locking shock absorption protection 19 is pressed back, and the control steel cable 191 for resetting the safety of the rear wheel and the front crawler is released at the same time, so that the safety lock 28 of the front crawler and the safety lock 29 of the rear wheel are in a safe locking state under the action of the locking reset spring 17.

3. Off-road mode conversion (with reference to fig. 3):

when the off-road mode key is pressed, the retraction reset groove 327 of the rear auxiliary wheel 32 is manually locked in the positioning key 331, and the magnetic control sensor 311 and the magnetic control trigger magnetic block 329 are in the same position. Otherwise, alarming and stopping conversion.

4. The lying function is as follows: (preventing the front brace from lifting the main shaft upwarping)

The rear auxiliary wheel retraction groove 327 of the rear auxiliary wheel 32 is manually locked in the positioning key 331, so that the magnetically controlled sensor 311 overlaps the magnetically controlled trigger magnetic block 329. The cross-country mode is selected, and the adjustable temporary couch top 38 is adjusted horizontally or at a selected angle, and the backrest 46 is adjusted to a suitable angle. No matter in the stair mode or the cross-country mode, when the rider leaves the chair, the main shaft 402 needs to be firstly pressed down by the flat upwarping limiting rod, and the bottom beam 4 and the front crawler are locked. When the wheelchair is used, the power supply needs to be turned off, and the wheelchair is prevented from being moved by mistake.

Referring to fig. 1-7 and fig. 2-1, 2-2, the control process in the driving process of the present invention is as follows:

1. level ground normal road driving (see fig. 1): the wheelchair is the same as a common electric wheelchair.

2. Stair step travel (see fig. 2, 2-1, 2-2):

a. step-up: when the wheelchair is switched on the flat ground, the rear auxiliary wheel independent support groove 326 is clamped in the positioning key 331, the ground contact wheel 324 is driven by the transmission belt 34 to rotate in the same direction of the wheelchair, when the auxiliary support wheel 323 contacts a step, the rear auxiliary wheel 326 is moved out of the positioning key 331, the rear auxiliary wheel 32 rotates in the opposite direction of the wheelchair when meeting resistance, and when the resistance is not available, the rear auxiliary wheel rotates in the same direction under the action of the rotating torsion spring 325 (the elastic force only enables the rear auxiliary wheel to freely extend to slide to the rear auxiliary wheel independent support positioning key 331 when the rear auxiliary wheel is free from obstacles), so that the influence of the resistance is small and small when the wheelchair is ascended to the step. The auxiliary wheels on the rear of each step can be gradually pressed to pass through the steps in the front and then gradually extend backwards to provide safety guarantee for the wheelchair. The chair surface angle stabilizing regulator 8 regulates the horizontal state of the chair surface along with the change of the step angle. The front auxiliary wheel 23 and the rear auxiliary wheel 32 are matched with each other on the steps to play a safety guarantee.

When the mode of the stairs is switched by leaning on the steps, the switching is completed, and the wheelchair can go up the steps as long as the operating rod is pulled backwards.

b. Up to the last step (see fig. 2-1): the rear track is raised gradually above the ground and the rear auxiliary wheels are extended to be caught by the rear auxiliary wheel independent support positioning keys 331. After passing through the balance point according to the weight and the sitting posture of the person, the wheelchair can smoothly transition to the flat ground under the action of the pneumatic supporting rod 10 behind the instantaneous regulator 12 of the rear auxiliary wheel 32.

c. Continuously climbing steps: and repeating a and b. The corner platform is large, the direction of the stairs is changed by using the operating rod as the stairs travel on the flat ground, one side or two sides of the front small wheel can be folded to reduce the length of the wheelchair when the corner platform is small, and the mode can be firstly converted into the mode adjustment angle and then the mode can be converted into the stair mode when the corner platform is too small.

d. And when the step is finished, the corresponding mode is switched according to the application.

e. Descending a step; (in any case, the folding reset groove 327 of the rear auxiliary wheel must be moved out of the positioning key 331 of the independent support of the rear auxiliary wheel to unlock the step)

After switching to the stair mode, the joystick is pushed forward toward the step, and when the front track driven wheel 223 approaches the edge of the step, the front track extends downward beyond the front auxiliary wheel 23 to be extended together with the front track under the action of the front pneumatic support rod 9. The current track triggers magnet 211 and triggers speed reduction sensor 18 and triggers wheelchair driving motor speed reduction, and if the human body weight is too light at this moment, the preceding track stretches downwards and can drive the wheelchair to suddenly move forward and contact rubber wheel 222 rotating along with the pair of wheels, because the rotation direction of 222 is opposite (clockwise) and forces the wheelchair to realize the buffering backward (prevent excessive preshoot) to ensure the sense of safety of the person taking, make the wheelchair slowly transition to the step along with the cooperation of the antedisplacement back track of wheelchair and seat angle stable regulator 8.

f. Safety guarantee of downward driving: because the front and rear caterpillar bands support the auxiliary wheels, the wrap angle of the vertex angle of the step and the damping action of the front and rear auxiliary wheels are formed, the front and rear caterpillar band combination part is sunken, the gravity center of the wheelchair is lowered and moved backwards, and the safety level monitoring pipe is designed for the purpose, the deceleration design of the transition section provides multiple safety guarantee for the wheelchair.

g. Down to the last step state (see fig. 2-2): when the front caterpillar track goes down to the last step, the included angle of the front caterpillar track to the ground is gradually reduced, when the included angle is about 15 degrees, the extension arm 231 of the front auxiliary wheel is gradually pressed forwards, when the included angle is about 10 degrees, the forced reset shaft 234 touches the bottom beam, and the front auxiliary wheel is gradually reset above the caterpillar track along with the reduction of the included angle. When the rear crawler 30 passes the edge of the rearmost step, the damping spring actuating block of the rear sub-wheel 32 rotates the torsion force of the damping spring 325 to the near limit, so that the ground contact supporting wheel 324 of the rear sub-wheel can catch the step to slowly land the rear crawler.

h. Continuously descending steps: duplicate entries e and g.

j. And then, climbing steps: at this time, the rear auxiliary wheel is 180 degrees backwards, if the rider can operate the wheelchair to retreat lightly, the rear auxiliary wheel will be arched upwards due to the design of the angle when the ground contact supporting wheel 324 contacts the step to be blocked, and the state of going up the step is achieved. If the weight of the person is too heavy, the operation cannot be realized, and the operation needs to be realized by switching the mode from a new mode.

3. Off-road mode driving instructions (see fig. 3):

running on sandy beach, grassland, ice, snow and muddy road: the mode is converted into the stair mode, but the retraction reset groove 327 of the rear auxiliary wheel needs to be pushed into the independent support positioning key 331 for locking, otherwise, the alarm is stopped. When the front and rear crawlers are horizontal to the ground, the

speed control plates

272 and 372 are overlapped, the stair speed fixing convex strip 131 and the stair speed boss 153 are separated, the cross-country speed fixing convex strip 132 and the cross-country speed boss 154 are overlapped, and the clutch transmission 15 is adjusted to the speed of the cross-country mode.

The seat angle can be adjusted by means of a handwheel 412 in the adjuster 41. In which mode the safety level monitoring tube 42 is closed.

4. Obstacle spanning capability (see fig. 4): the width is not less than 60cm (can bear the rolling of left and right tracks), such as the barriers with the height and the length not more than 30cm, such as doorsills, trunks, steps, curbstones and the like, and the barriers with the other lengths and the ditches with the width not more than 35cm, which are lower than 25cm, can cross over and run.

Obstacle crossing operation: the rear crawler is close to the barrier, the control lever is operated to slowly run in an off-road mode (if the wheelchair moves forwards automatically when the mode is switched over when the distance from the barrier is too close), and the wheelchair does not sink due to the combined action of the front air stay fixing part, the mode switching electric rod 7, the seat angle stabilizing regulator 8 and the rear telescopic regulating rod 17 when the main shaft 402 of the wheelchair is suspended. When the front crawler belt is driven away from an obstacle, the rubber roller 454 or the rubber block 452 of the front foot pedal 45 plays a supporting role, and at the moment, the front crawler belt extends downwards and also passes through the speed reduction process of the sensor 18 and the magnetic block 211, so that the safety is guaranteed. When the front crawler belt touches the ground and the pedal 45 leaves the obstacle, the chair front end sinks to the chair surface angle stabilizing regulator 8 to adjust balance, and the front crawler belt and the rear crawler belt slowly and horizontally touch the ground to complete crossing. When the vehicle passes through a ditch, the vehicle needs to run in the forward direction, the front crawler passes through the ditch and presses down the bottom beam and the front crawler locking hook 39 to prevent the front end of the crawler 20 from extending downwards.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multifunctional wheelchair comprises a seat, a traveling mechanism and a driving unit, and is characterized in that: the seat comprises a deformable seat frame, an adjustable seat surface, an adjustable backrest and a front and back telescopic adjusting support rod; the deformable chair frame comprises an upper beam, a bottom beam, a front upright post and a rear upright post which are arranged in pair from left to right, and the left and the right and the front upright posts are correspondingly hinged with the upper beam and the bottom beam through connecting shafts;

2. The multi-function wheelchair of claim 1, further comprising: the rear end of the adjustable chair surface is hinged on the upper beam, and a chair surface angle adjuster is arranged between the front end of the adjustable chair surface and the upper beam; the chair surface angle regulator comprises a mounting rack, an adjusting screw rod, a nut and an adjusting hand wheel/motor; an adjustable connecting shaft is arranged between the adjustable backrest and the upper beam;

3. The multi-function wheelchair of claim 1, further comprising: the distance between the front upright post and the centers of the upper beam and the bottom beam corresponding to the connecting shafts is larger than the distance between the rear upright post and the centers of the upper beam and the bottom beam corresponding to the connecting shafts, so that when the wheelchair is in a stair mode, the front of the seat surface is high and the rear is low, the seat surface has a certain gradient, a rider can be prompted to lie backwards to lean the center of gravity backwards, and a forward overturning accident is prevented;

4. The multi-function wheelchair of claim 1, further comprising: the flat ground walking mode self-locking device comprises a front wheel walking mode locking mechanism, a rear wheel walking mode locking mechanism and a front crawler assembly resetting locking mechanism; the front wheel walking mode locking mechanism comprises a flat walking locking reed and a limit locking plate, wherein the fixed end of the flat walking locking reed is installed on an installation arm where a front wheel is located, and the free end of the flat walking locking reed is in plug-in fit with the limit locking plate arranged on a bottom beam to realize locking and positioning;

5. The multi-function wheelchair of claim 1, further comprising: the power unit is a power motor;

the speed change transmission mechanism comprises a clutch transmission case positioned on the rear upright post, and a stair speed fixing convex strip, a cross-country speed fixing convex strip, a stair cross-country mode fixing boss, a flat ground mode fixing boss, and a clutch plate and a driving gear which are respectively corresponding to the stair speed fixing convex strip, the cross-country speed fixing convex strip, the stair cross-country mode fixing boss and the flat ground mode fixing boss are arranged in the clutch transmission case;

6. The multi-function wheelchair of claim 5, further comprising: the bottom beam is simultaneously provided with a hand-push wheelchair/electric drive selection knob, a selection cam and a top column, wherein the selection cam is rotationally connected to the bottom beam through a wheel shaft, the selection knob is embedded on the wheel shaft, the top column is embedded on the bottom beam and is positioned right above the selection cam, and the surface of the selection cam is abutted against the lower end surface of the top column;

when the electric driving is needed, the hand-push wheelchair and the electric driving selection knob select the cam to be rotated to be in a vertical state, the pressing is switched, the jacking column is jacked up, so that the flat ground mode clutch switching lug boss and the flat ground mode fixing convex strip are overlapped, the clutch plate is pushed to be combined with the driving gear, and the electric driving function is realized.

7. The multi-function wheelchair of claim 1, further comprising: the lower end of the rear upright post is provided with an anti-overturning mechanism; the anti-turnover mechanism comprises an anti-turnover rod, wherein one end of the anti-turnover rod is provided with an anti-turnover wheel, the other end of the anti-turnover rod is provided with a turnover driving mechanism, and the end of the anti-turnover rod is provided with a retraction locking knob;

8. The multi-function wheelchair of claim 1, further comprising: the device also comprises an instantaneous regulator, wherein the instantaneous regulator comprises a cylinder body with an opening at one end, an adjusting and damping spring and a triggering magnetic block are arranged in the cylinder body, and a magnetic control Hall switch is arranged on the surface of the cylinder body; the closed end of the cylinder is hinged to the rear crawler assembly, the open end of the cylinder is sleeved with the end part of the seat surface angle stabilizing adjuster in a sliding mode, and the triggering magnetic block is arranged between the damping spring and the end part of the rod-shaped seat surface angle stabilizing adjuster.

9. The multi-function wheelchair of claim 5, further comprising: the front crawler assembly comprises a front crawler inner side guard plate, a front crawler driving gear, a front crawler transmission pair wheel, a rubber wheel rotating along with the pair wheel, a front crawler transmission driven wheel and a front crawler speed adjusting disc;

10. The multi-function wheelchair of claim 1, further comprising: the front crawler assembly and the rear crawler assembly are respectively and correspondingly provided with a front auxiliary wheel and a rear auxiliary wheel; the extension end of the front auxiliary wheel is hinged with a front auxiliary wheel extension arm and an extension arm extension spring, and meanwhile, a damping spring driving block, a forced reset shaft during flat ground running, a front auxiliary wheel extension torsion spring, a front auxiliary wheel damping spring and a front auxiliary wheel corner damping limiting block are arranged on the front auxiliary wheel;

the rear auxiliary wheel comprises a driving wheel, a ground contact supporting wheel and a transmission belt; the ground contact supporting wheel is provided with a magnetic control sensor and a magnetic control sensor triggering magnetic block which are paired;