Title of Invention

"ELECTRO-MECHANICAL POWERED WHEEL CHAIR"

Abstract

The electro mechanical powered wheelchair was developed to make bed ridden groups of severely physically challenged persons whose mobility has been extremely limited even to two fingers only. The present invention consists of two batteries, a main drive motor, a gear box, a turning system with a separate motor and a reduction gear box, a clutch system, a control panel box having fitted with a joystick switch a turning indicator switch a horn button, battery status indicator and a key lock switch, fro and aft movement turning system, speed control and electronic braking are all controlled by a single joystick switch, a potentiometer for sensing of the turning angle of the rear wheel. These form the unique features of this exceptional invention.

Full Text

4. DESCRIPTION The object of this invention is to help daily living activities usefulness, self esteem and social activity of severely physically challenged persons and chronically all cases. Who find difficult to propel manual wheel chairs because of weak and paralyzed muscles or chromic arthritis deformed cases. The aim is to provide enhance easy transport to and from place of vocation and promote the activities inside and out side his provides. Large number of sophisticated electrical wheel chairs are available in United states, European Country but the prohibitive prices problem of repair makes it unreachable for average disabled persons. In this innovation of electro mechanical powered wheel chair all has been made to keep the mechanism as less expensive and easily available and reparable as possible. The disadvantages of using separate knobs for various movements of the electrically operated mobility systems available have been overcome in this invention. The invention of electro-mechanical powered wheelchair is a system of mobility for severely handicapped person who can negotiate on both even indoor rooms and verandahs as well as on rough roads and mild slopes. It is built on steel pipe frame manual wheel chair with sturdier larger wheels shifted to the front and the small castor replaced by wheels shifted to the rear electrical drive unit assembly is fitted to the front wheels. The angular movement of the rear wheels is powered by separate small motor and gear box connected to the rear wheel by levers. BACKGROUND QF THE INVENTION All the wheelchairs that are being manufactured in India at present are operated manually, with the user using his hands to push the hand rim on the wheels of the wheelchair, or some assistant of the user pushing the wheelchair from behind for transportation of the user. This has its disadvantages because many a times the user may be an old and / or infirm person who may not be able to put in the effort for propelling the wheelchair and also because a suitable help or assistant may not be available to the user for moving the wheelchair. SUMMARY OF INVENTION in the present invention, there is a main drive motor, a gear box, a steering mechanism (which has its own separate motor and reduction gear), two 12 volt batteries, clutch system, and an electronic joystick control which are fitted on to an appropriately designed wheelchair for it to be operated by the user by simple movements of the joystick of the joystick control unit placed on one of the arm rests of the wheelchair. Thus the disadvantages of a manually operated wheelchair are eliminated in the present invention. STATEMENT OF INVENTION The electro-mechanical powered wheelchair comprising: A frame designed and fabricated with mild steel pipe and its chassis fabricated with mild steel pipes to locate motor, redicon, batteries, charger and electronic circuit plates; Front wheels comprising rim, spokes, hub (including brake drum), tyre, tube which are mounted on blocks fixed in the frame with the help of an axle; Rear wheels or castors the rims of which are made of tough plastic, having pneumatic tubes and tyres and mounted with the help of axle in the fork made of mild steel pipe; Well cushioned seat, back and arm rest, with the arm rest being detachable; A worm and worm wheel type horizontal Redicon gear to reduce the high speed of revolutions of the motor, which is mounted on a platform made of mild steel plate fixed on the chassis; An electronic braking device in the joystick switch which is operable during movement of the wheelchair; A turning system which is controlled electronically by the joystick switch, the functioning of which is controlled by a gearbox and a small motor; A motor which is used for the main drive and is mounted on base brackets fixed on the chassis, the motor can be adjusted by an adjusting bolt and a "V" pulley mounted on its spindle to transmit the power to the reduction gearbox through a "V" belt; Electronic circuits designed to control and regulate the speed, forward and backward movements, and the electronic PCB, field control circuits, armature control circuits, etc are fixed on polypropylene sheets mounted on mild steel strip base and a circuit breaker provided to meet the circumstances arising as a result of short circuiting; An operating control panel box made of acrylic sheets and aluminum angles which contains the joystick switch which in turn controls forward, reverse and steering movements as well as the speed of the wheelchair, the electric horn and its push button switch are also mounted on it, and the ignition key switch at the rear of the box, with the battery charge status indicating light fitted on to the box behind the horn switch; A face type clutch system with shifting bracket mounted on outlet shaft of the gearbox with clutch boss and the 'female' part is made in the matching sprocket mounted on the main wheel; A built-in battery charger is provided and every time after using the wheelchair the battery charger plug is to be connected to AC power socket to get the battery fully charged again; Two maintenance free batteries are provided as source of power; Head lights and side indicating lights for operating the wheelchair at night. BRIEF DESCRIPTION OF FIGURES The above features and designs of the invention will be clearer in the following twenty figures given herein: Fig. 1 shows plan of Chassis fabricated by steel flat pieces. Fig. 2 shows side view of the same chassis in figure 1. Fig. 3 shows elevation of Chassis shown in figure Fig. 4 shows the right side of the assembly of electro mechanical powered wheel chair. Fig. 5 shows the left side of the assembly of electro-mechanical powered wheel chair. Fig. 6 shows elevation of the assembly of the wheel chair. Fig. 7 shows plan and side view of the pulley mounted on the wheel. Fig. 8 shows plan and side view of the pulley mounted on inlet shaft of Redicon. Fig. 9 shows plan and elevation of sprocket mounted on outlet shaft of the Redicon. Fig. 10 shows the plan and elevation of sprocket mounted on hub of left side main drive wheel. Fig. 11 shows cross section, plan and end view of hub of drive wheel. Fig. 12 shows the plan of axle shaft of drive wheel. Fig. 13 shows the plan and elevation of the gear box of turning system. Fig. 14 depicts the details of rack and pinion of turning system gear box. Fig. 15 shows the plan and elevation of a gear for turning system gear box. Fig. 16 shows plan and elevation of a small gear for turning system gear box. Fig. 17 depicts the detail of turning system, lever, bush, washer and bracket. Fig. 18 shows the cross section of the shock absorber assembly. Fig. 19 shows the plan and elevation of foot rest. Fig. 20 shows the block diagram of electrical circuit of electro mechanical powered wheel chair. DETAILED DESCRIPTION OF FIGURES: Wheel chair consists of a chassis made of a flat steel strips as shown in figure 1 for mounting batteries main drive motor reduction gear box, battery charger, and steel pipe frame of the wheel chair is also welded on it. Fig. 2 is the side view of the chassis of fig.1.Fig. 3 is showing the elevation of the chassis with the frame welded on it, showing the thick plate for mounting the drive wheels and the housing for mounting shock absorber with the rear wheels. It also shows the frame of the back rest, seat and foot rest-mounting. Fig. 4 shows the right side of the assembly of electro-mechanical powered wheel chair showing arm rest (1),clutch operating lever(2), back side cover (3), support bar for back rest (4), fork (5) for holding the rear turning wheel ( 6 ), sprocket mounted on gear box (7), roller chain (8), connecting the sprocket on the reduction gear box to the sprocket (9) mounted on the drive wheel hub (12), attached to the left side main drive wheel (11), it also shows the foot rest (10). Fig. 5 of the invented electro mechanical powered wheel chair shows the left side assembly of the wheel chair displaying detachable right side arm rest(1A), with attached operating control panel box (15) which has joystick switch (15A) ignition lock, horn button ,side indicator switch .battery power indicator light, the opening for motor adjusting stud (16), left side cover (3A), pushing handle (14) having hand grip (13). In reference to Fig.6 , elevation of the assembly of the said wheel chair showing the brake lever (17), wheel axle (19) and axle nut (18) main drive motor (20) mounted on the steel platform (21), pulley (22) mounted on the main drive motor shaft connecting to the pulley (25) on the inlet shaft of the reduction gear box (24) with the help of a V belt (23) also displays the head light (26) and side indicating light (27),the seat cushion (28) , and the back rest cushion (29) are also displayed. In reference to Fig.6. the motor pulley (22) is shown in Fig.7, and Gear pulley (25) is shown in Fig.8. Then in reference to Fig.4, Sprocket (7) on reduction gear box is shown in Fig.9 and sprocket (9) mounted on drive wheel hub is shown in Fig. 10, wheel hub (12) of Fig.4 shown in its side view plan and section in Fig.11. Again in reference to Fig.6, the axle shaft (19) is shown in Fig. 12. In the invention of Electro Mechanical Powered Wheel Chair, Fig. 13 shows the plan and elevation of the Turning System Gear Box Assembly. Referring to Fig. 13, the details of Gears (1), (2) & (6) in the turning system gear box are shown in Fig. 14 as rack and pinion and the Gear in Fig. 15, is shown at (3) of Fig. 13 and two connecting gears in Fig. 16 is shown on (4) and (5) in Fig.13. Fig. 17 shows the turning system lever (1) mounted on the fork spindle of right side rear wheel, a collar bush (2), a washer (3) and a bracket (4). Fig. 18 is the cross section of shock absorber assembly showing central spindle (1), base spacer (2) is supporting thrust bearing (3), spring support bush (4), compressor spring (5),outer housing (6) and top bush (7). Fig.19 shows the plan and elevation of the foot rest. Fig. 20 is the block diagram of the electrical circuits of the Electro Mechanical Powered Wheel Chair, which has the electrical control circuit between battery, Miniature Circuit Breaker (MCB), contactor relay, key switch, head light joystick switch, main control PCB, potentiometer for turning angle sensing, tuning motor control circuit, two limit control switches, main motor field control circuit, main motor armature control circuit, battery status indicator, horn push button switch, turning light (blinker) switch. CLAIMS I claim that: 1. The electro mechanical powered wheelchair Invention has a frame designed and fabricated with mild steel pipe and its chassis fabricated with flat mild steel strips to locate motor, redicon, batteries, charger and electronic circuit plates; two larger front wheel assemblies of the wheelchair comprising rim, spokes, hub (including brake drum), tyre, tube is mounted on blocks fixed in the frame with the help of axles on each side of the frame, the two rear wheels the rims of which are made of tough plastic alloy, having pneumatic tubes and tyres mounted with the help of axle in the fork made of mild steel pipe having a vertical spindle which is assembled with a shock absorber, the said shock absorber is welded to the side of the frame similar rear wheel assembly is fabricated on the other side of the frame, well cushioned seat back and detachable arm rests are also provided; the invention claimed in claim 1 has a horizontal Reductions Gear Box to reduce the high speed of revolutions of the main drive motor, which is mounted on a platform made of mild steel plate is fixed on the chassis. the claimed invention of electro mechanical powered wheelchair is provided with electronic braking device in the joystick switch, which is operable during movement of the wheelchair, a turning system is also provided, which is controlled electronically by the same joystick switch, the functioning of which is controlled by a separate gearbox and a small motor; a motor which is used for the main drive in the claimed invention is mounted on base bracket fixed on the chassis, the motor can be adjusted by an adjusting bolt and a "V" pulley mounted on its spindle to transmit the power to the reduction gearbox through a "V" belt; the claimed invention of electro mechanical powered wheelchair is also provided with electronic circuits designed to control and regulate the speed, forward and backward movements, and the electronic PCB, field control circuits, armature control circuits, etc are fixed on polypropylene sheet mounted on mild steel strip base and a circuit breaker provided to meet the circumstances arising as a result of short circuiting; the invention claimed in paragraphs 2, 3, 4, 5 is also provided with an operating control panel box made of acrylic sheets and aluminum angles which contains the joystick switch which in turn controls forward, reverse and steering movements as well as the speed of the wheelchair, the electric horn and its push button switch are also mounted on it, and the ignition key switch at the rear of the control panel box, with the battery charge status indicating light fitted on to the box behind the horn switch; a face type clutch system with shifting bracket mounted on outlet shaft of the gearbox with clutch boss and the female part is made in the matching sprocket mounted on the same outlet shaft of the gear box; two maintenance free batteries for the source of power and two sets of head lights and side indicating lights for operating the wheelchair at night are also provided; a built-in auto cut battery charger is provided to get the batteries charged again every time after using the wheelchair the battery charger plug is to be connected to AC power socket; the electrical control circuit connected by a set of insulated wires to supply power from battery to potentiometer; the said potentiometer is mounted above the fork-spindle of the left side rear wheel provided to sense the turning angle of the rear wheel; it is also claimed that all the five functions of the wheelchair fro and aft, side to side turning, speed control and electronic braking are regulated by one joystick switch; the above claimed electro mechanical powered wheel chair also included there in, with claims of the above paragraphs, I also claim that the wheel chair has the electrical control circuit between battery, miniature circuit breaker (MCB), control relay, key switch, head light, joystick switch, main control PCB, potentiometer for turning angle sensing, tuning motor control circuit, two limit switches, main motor field control circuit, main motor switch, turning light switch (blinker). 2. The invention of electro mechanical powered wheel chair as herein described, with reference to the accompanying sheets of figures, is claimed.

Documents:

1151-del-2003-abstract.pdf

1151-del-2003-claims.pdf

1151-del-2003-complete specification (granted).pdf

1151-del-2003-correspondence-others.pdf

1151-del-2003-correspondence-po.pdf

1151-del-2003-description (complete).pdf

1151-del-2003-description (provisional).pdf

1151-del-2003-drawings.pdf

1151-del-2003-form-1.pdf

1151-del-2003-form-19.pdf

1151-del-2003-form-2.pdf

1151-del-2003-form-3.pdf