Door lock, with a spring bolt linked to a slide, is released by a press follower when in the locked position to give an easy opening from the inside e.g. on escape from a fire

摘要

The door lock has a spring bolt (1), chamfered on one side, linked to a slide (2) to be retracted from the lock by the lock hand grip. In the locked setting, a block prevents rotation into the release position unless a follower (3) is pressed to clear the block. The block has a two-arm lever (6) which pivots on the slide. One lever arm (6a) works with the operating follower, and the other lever arm (6b) prevents the locked bolt from rotating out of the locked position, either directly or through a stop unit.