| 摘要 |
A vehicle lift (L), as for wheelchairs, incorporates a horizontally disposed load platform (P) pivotally affixed to a laterally spaced-apart parallelogram elevating frame (E) which is in turn pivotally affixed to a carriage (C), allowing a composite travelling assembly (platform (P), elevating frame (E) and carriage (C)) to be stowed in a mounting enclosure (M). Alternatively, the parallelogram mechanism may be geometrically unequal to vary the level of the platform (P) with movement. A hydraulic ram (40) actuates the parallelogram elevating frame (E) mechanisms to position the platform (P) at different terminal positions, i.e., ground level, vehicle floor level and stowing level. At the stowing level, a pair of laterally spaced-apart rack-and-pinion mechanisms (100, 102, 104, 106) actuate the aligned platform (P), elevating frame (E) and carriage inboard, on laterally opposed guide rails (56, 58) to be stowed in a mounting enclosure (M). Alternatively, the mounting enclosure (M) may be attached to the vehicle (V) in a horizontally offset position by shaping the guide rails (56, 58). An electrical system is manually actuated to attain various movements; however, a switching mechanism provides overriding safety control, and for stowage, automatically actuates the hydraulic ram (40) to attain the aligned stowing level. A ball detent clutch drive (118) provides audible protection against overloading and injury to personnel. A roll stop mechanism (R) is affixed to the outboard end of the platform (P) and is automatically actuated to move from a ramp position at ground level to a vertical safety stop position when the platform (P) is elevated. A bridge plate mechanism (B) is affixed to the inboard end of the platform (P) to bridge the gap between the platform (P) and the vehicle (V) at vehicle floor level yet function as a vertical safety barrier at all other platform positions. A hinged handrail (H) is fitted to each side of the platform (P) for passenger safety. |
