Patent ID: 7624826
Filing Date: 2009-12-01
Classification: A61G,Y10S

Abstract:
1. A portable power-saving and foldable electric wheel chair, comprising a frame of wheel chair ( 1 ), two vertical pipes ( 1 . 1 ), two horizontally supporting pipes ( 1 . 2 ), two main vertical pipes ( 1 . 3 ), two rear wheels ( 3 ), a front direction wheel ( 4 ), a front caster ( 4 . 1 ), a left arm-rest pipe ( 5 ), a right arm-rest pipe ( 6 ), and two arm-rests ( 2 ), the front ends of the left and right arm-rest pipes ( 5 ) and ( 6 ) are bent as elbows ( 10 , 12 ), a hand control direction device is installed on the left elbow ( 10 ), a speed-adjusting turning handle ( 14 ) and a hand press brake handle ( 15 ) are installed on the right elbow ( 12 ), characterized in that the chair has a power-saving driving unit, motor directly driving rear wheel, and has a power-saving braking unit, manual disc brake, and has a direction control unit; wherein said driving unit comprises: there are two mounting vertical boards ( 19 ) of the rear wheels at the lower end of the left and right main vertical pipes ( 1 . 3 ) respectively, the rear wheels ( 3 ) with motors ( 30 ) are secured on the vertical boards ( 19 ) by bolts and nuts, the said motors ( 30 ) are DC and brushless motors with stepless adjustable speed, low rotation speed, and high torque, the housings of the motors ( 30 ) are integrated with the steel wheel plates ( 31 ), with double motors directly driving double rear wheels; wherein said braking unit comprises: disc brakes ( 20 ) are installed on the left and right rear wheels, the disc brake includes a disc brake sheet ( 21 ), a brake clamp ( 22 ) and a brake rod ( 23 ), the disc brake sheet ( 21 ) is installed by the side of the motor ( 30 ) by means of tightly screwing the female screw of the disc brake sheet ( 21 ) in the male screw on an end-cover of the motor ( 30 ), the brake clamp ( 22 ) and the brake rod ( 23 ) are fixed on the vertical board ( 19 ) via a connecting plate ( 27 ) with screws; the hand press brake handle ( 15 ) and the disc brakes ( 20 ) are connected to a braking steel string via a delta-shaped conversion plate ( 26 ), the upper end of the delta-shaped conversion plate ( 26 ) is connected to the brake handle ( 15 ) via the main steel string ( 24 ), the left and right lower ends of a delta-shaped conversion plate ( 26 ) are connected to the left and right brake rods ( 23 ) via left and right branch steel strings ( 25 ) respectively, by means of a single hand to press brake handle ( 15 ) or by means of a small electric device to draw the main steel string ( 24 ), the brake rods ( 23 ) are tightly pulled so that the two brake clamps ( 22 ) tightly clip the two brake sheets ( 21 ), and the two rear wheels ( 3 ) are braked simultaneously, wherein said direction control unit comprises: two switches ( 18 ) for positive or inversion running of the motors are installed on the connecting places between the front of the left armrest pipe ( 5 ) and right armrest pipe ( 6 ) and the left and right vertical pipes ( 1 . 1 ), to control the main running direction of the electric wheel chair—to go forward and backward or to turn left and right in situ; and the hand control direction device includes a fixing plate ( 11 ), a hollow bearing ( 13 ), a vertical hand control rod ( 16 ), a hand control direction handle ( 17 ), the vertical hand control rod ( 16 ) inserting through the hollow bearing ( 13 ), the upper end of the rod is connected to the hand control direction handle ( 17 ), the lower end is connected to the front direction wheel ( 4 ), the specific running direction of the electric wheel chair can be accurately controlled by means of holding the hand control direction handle ( 17 ) with the left hand to control the front direction wheel ( 4 ).