| 摘要 |
<p>There is described a lock mechanism for a leaf hinged within a frame, the lock mechanism comprising a first bolt (22,60,100,152,184) and at least one further bolt, each bolt being movable between an engaged position in which a distal end of the bolt (22,60,100,152,184) projects from the leaf and a disengaged position, the bolts being directly driveable together between the engaged and disengaged positions by movement of a common drive member (34,106,160), the first bolt (22,60,100,152,184) having a proximal end engaged by the drive member (34,106,160) and isolating means (28,72,108,164,176) for ensuring that, when pressure is applied to the distal end of the first bolt (22,60,100,152,184) tending to move it to the disengaged position, the or each further bolt is not moved to the disengaged position. <IMAGE></p> |
