| 摘要 |
A stop system for a platform (1) which is movable horizontally from a central position within a supporting frame (3, 4, 5, 6) to project to one side or the other of the frame has manually releasable latches (14, 15). These co-operate with stops (7, 8) near diagonally opposite corners of the platform, normally to hold the platform centred. Each latch can be disengaged from its stop to allow the platform to move out from the associated side of the frame, and then released to co-operate with another stop (13, 14) on the platform when that reaches its outward limit. A further stop (19, 20) can simultaneously engage one of the first stops (7, 8) to guard against skewing. On returning the platform (1) to the centred position, the latches (14, 15) automatically re-engage. |
