| 摘要 |
A wheel lock for a wheelchair (10), where the wheelchair has a rear drive wheel (14), includes a housing (32) adapted to be mounted on the wheelchair. The housing (32) has two pivot points (58) spaced apart in a forward/rearward direction. A wheel contact arm (66) has a pivot shaft (64) pivotally mounted about one of the pivot points. The wheel contact arm (66) has a wheel engagement edge (68) adapted to contact the rear drive wheel. The wheel lock also includes an actuation lever (36) pivotally mounted about the other of the pivot points, and a linkage (80) connecting the wheel contact arm (66) and the actuation lever (36). The housing (32), the pivot shaft (64), the actuation lever (36) and the linkage (80) form a four bar linkage. Pivoting of the actuation lever causes pivoting of the wheel contact arm to engage the wheel contact edge with the rear drive wheel.
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