Lock for high security sliding door, comprises bolt which is spring loaded towards a locked position, an operating plate with articulated latch to engage with fixed lug and door detecting finger

摘要

The lock (2) may be mounted on the door or door frame of sliding doors and has a bolt (24) which is spring loaded (34) towards a locked position. When the door is not closed the bolt may move because a detecting finger (102) trips the latch (42,44) on the operating plate (40). When the door is closed the spring loaded latch is operative and the door may only be opened by an electromagnet (78) striking a latch plate (72). An Independent claim is also included for : A door frame on a railway carriage which uses the lock