| 摘要 |
PCT No. PCT/GB98/00088 Sec. 371 Date Aug. 11, 1999 Sec. 102(e) Date Aug. 11, 1999 PCT Filed Jan. 12, 1998 PCT Pub. No. WO98/30135 PCT Pub. Date Jul. 16, 1998A 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 centered. 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 centered position, the latches (14, 15) automatically re-engage. |
