Plastics lock plate for door frames/trim for use with external alarm circuits has provision for insertion of lock bar so plate with contacts is forced inwards by spring for second closure process

摘要

The device (1) has a provision (3) for the insertion of a lock bar so that a plate with contacts (9) is forced inwards by a spring (10) for the second closure process. The contacts trigger an electrical pulse when the bar forces the plate inwards, causing an external alarm trigger unit to be set and to inhibit a message of the authorized person closes the door properly.