| 摘要 |
<p>The trolley consists of two supporting assemblies (21,22) with wheels (24) and at least one roller (25), and a system for moving the two assemblies relative to one another between rest and raised positions. The system comprises a lifting strap (26) with its two ends connected to the supporting assemblies, and actuators (27,29) with cams and a ratchet tensioner for moving the strap between rest and raised positions. The wheel is held on the trolley by a safety strap (49) passing over the top of its tire.</p> |
