| 摘要 |
The trolley includes an operating control which comprises a manoeuvring screw (18) in engagement with a nut component (21) movable along and non-rotatably engaged with the draw bar (2). The nut component is coupled to an articulated lever arrangement comprising a link (28) and pivotably located arms (12), at the lower ends of which are wheels (8). The point of articulation (34) between the link and each arm is located between the wheel fixture and the arm pivot axis on the draw bar. |
