| 摘要 |
<p>The device has a rotatable retaining unit (9) e.g. metallic bracket, which is provided at a body of a castor (7) e.g. leading pulley, by a spring lock. The retaining unit holds a drive motor (4) having a gear unit (5). An adapter (6) fixed at the castor includes a disc with a toothed ring section, which receives an output shaft of the gear unit. A toothed wheel of the gear unit intermeshes with the adapter in a positive-fit manner.</p> |
