| 摘要 |
A trolley (B), which is adapted to be connected to a wheel-mounted loading trolley (A), has idle wheels (2, 2a) on which it can be wheeled by hand, either alone or together with the loading trolley (A). The trolley (B) further has a motor-driven wheel (4). The wheel (4) and the associated motor (3) are fixed to a tube (9) which is vertically displaceable and rotatably mounted in the chassis (13) of the trolley (B). By an operating handle (10), the tube (9) can be vertically displaced in the chassis (13). The operating handle (10) is articulated to the tube (9) and the chassis (13) by means of a dead-centre elbow mechanism (11). In the one stable position of the elbow mechanism (11), the motor-driven wheel (4) has floor contact in order to drive the trollley (B) and the loading trolley (A), if connected thereto. In the other stable position of the elbow mechanism (11), only the idle wheels (2, 2a) of the trolley (B) have floor contact when the trolley (B) is connected to the loading trolley (A). |
