Patent ID: 7581604

Claim:
A motorized wheelchair having right and left motorized rear wheels, and omni-directional front wheels having a plurality of rollers rotatable in a direction orthogonal to an alignment direction of wheels disposed for direction change around the circumference thereof, comprising: an operation lever provided on a body frame and operable between a regular position and a working position, a pair of transmission rollers for transmitting the rotation of the rear wheels to the front wheels while being disposed at a transmission position between circumferential surfaces of the rear wheels and the front wheels, a pair of roller supporting arms provided on the body frame so as to be movable between a neutral position and a transmission position while the transmission rollers are supported rotatably and oscillatingly in the front-rear direction of the wheelchair, and transmission roller pressure-contact springs for urging the roller supporting arms in the direction of the transmission position so that the transmission rollers are pressure-contacted with the circumferential surfaces of the wheels when at the transmission position, wherein the operation lever constrains the roller supporting arms in an interlocking manner in a direction away from the transmission position when at the regular position, and the constraint of the roller supporting arm is released when the operation lever being moved to the working position.