| 摘要 |
In control means of opening and closing a door to enhance detection of any obstructions, co-operating sensitive edges for a door and post, or two doors (1, 2) comprise a first bifurcated edge (3) and a second edge (7) with a blunt blade (6) flanked by two shoulders. When fully closed the ends of the limbs (4, 5) abut the shoulders forming three lines of sealing. An umbrella or handbag strap would prevent the blade (6) from entering between the limbs (4, 5) of the U enabling the obstruction to be readily detected significantly before the doors are fully closed. A simple pneumatic control circuit is described (Figure 2, not shown). <IMAGE> |
