| 摘要 |
<p>1. End-of-stroke device for automatically stopping the drum (1) intended for winding and unwinding the mobile member of a blind, roller shutter or other lifting apparatus, of the type comprising two threaded rods (5, 6) which are angularly connected to the drum (1) and on which are engaged two sliding nuts (7) retained angularly so that the rotation of said rods effects, in opposite directions, the axial displacement of these nuts which, once suitably positioned, successively assume a fixed end of stroke (position 0), provoking actuation of the contactors (12) adapted to ensure stop of the drum at one and the other of the two ends desired for the stroke of the mobile member, characterized in that with each of the two sliding nuts (7) is associated an unlocking mechanism (13-15-17) adapted momentarily to cause angular immobilization of the nut (7) in question to cease so that the latter rotates with respect to its threaded rod (5, 6) under the effect of elastic means (14) and thus returns as far as the fixed end-of-stroke with a view to a new adjustment.</p> |
