| 摘要 |
<p>The trolley has a frame (1) with two longitudinals (3) carrying wheels (2) at their lower ends with a space (9) between them. The longitudinals have a cross bar at upper ends, and there is a lever arm (11) coupled (14A, 14B) at one end to the frame. The arm is extensible and has a head (13) carrying an engaging face (16). The frame has in the area between its wheels, receiving couplings engaged by the inner end of the lever arm.</p> |
