초록 ▼

A wheelchair frame comprises a base frame part (1, 2) with a plurality of wheels (3, 33), including two front wheels (3), wherein each of said front wheels can be driven by an electromotor (4). The base frame part carries at the back side a castor assembly (13) located in the center and comprising a

A wheelchair frame comprises a base frame part (1, 2) with a plurality of wheels (3, 33), including two front wheels (3), wherein each of said front wheels can be driven by an electromotor (4). The base frame part carries at the back side a castor assembly (13) located in the center and comprising a swivel axle (14) with a neutral straight on position, wherein a device 22 is are provided for exerting a rotation force on the swivel axle in the direction of the straight on position at rotation of the swivel axle out of the straight on position.

대표청구항 ▼

[ I claim:] [1.] A wheelchair frame comprising:a base frame part having a front portion and a rear portion;a fork assembly mounted to the rear portion, the fork assembly having two legs movable between a neutral position and an urging position;a pair of front wheels rotatably coupled to the front po

[ I claim:] [1.] A wheelchair frame comprising:a base frame part having a front portion and a rear portion;a fork assembly mounted to the rear portion, the fork assembly having two legs movable between a neutral position and an urging position;a pair of front wheels rotatably coupled to the front portion of the base frame part defining a longitudinal center plane of the base frame part therebetween;an electric motor coupled to each front wheel; anda castor assembly rotatably coupled to the rear portion of the base frame part by a swivel axle at the center plane, the castor assembly having a neutral straight on position, the castor assembly further coupled to the fork assembly and having an eccentric member which is substantially fittingly positioned between the legs of the fork assembly when the castor assembly is in the neutral straight on position; andwherein rotation of the castor assembly from the neutral straight on position causes the eccentric member to move at least one of the legs from the neutral position in a direction away from the center plane to the urging position such that a restoring force is imparted on the castor assembly to rotate the castor assembly back to the neutral straight on position.