| 摘要 |
A wheel assembly for a wheelchair includes a mounting plate fixed on one side of the seat portion, a motor and a gear unit which includes a gear disc, and a gear shaft that extends through the gear disc. The motor includes a driving worm fixed on the motor shaft so as to mesh with the gear disc. The gear disc is formed with an engaging recess. The gear shaft carries a slidable transverse key thereon. A spring biases the gear shaft to engage the key in the recess. A driving gear is fixed on the gear shaft. A driven gear is mounted rotatably on the mounting plate and is fastened to a wheel. A chain interconnects the driving gear and the driven gear. A hand lever can be moved against the bias action of the spring so as to disengage the key from the recess of the gear disc. |
