| 摘要 |
Locking mechanism with a latch 4 in which a rotary cam 12a-e has means 12e to move the latch 4 between retracted and throw positions. The latch 4 is provided with an anti-thrust, aka dogging or deadlock, mechanism 22, 28 to prevent the lock being forced into the retracted position whilst the cam also has means 12d to disengage the anti-thrust 22 prior to the cam moving the latch 4. The anti-thrust mechanism may be a lever 22 which pivots around pin 24 and has a tongue 26 that engages with an aperture or notch 28 on the latch 4. The means to disengage the anti-thrust mechanism may be an arm 12d, a second arm 12c may be used to move the latch 4, the arms are preferably unitary and of different lengths. The latch may have bearings to aid the movement between retracted and throw positions. Also claimed is a method of operating said lock. Also claimed is a modular cam 12 with at least two inserting cams (12, 14 Fig 4), one of which is driven by a panic release, the other of which 14 is driven by an actuator which is selectively locked by a deadlock. |
