| 摘要 |
A door or window lock comprising a spring loaded latch (2) and a deadbolt (3) is provided with a key operated deadlocking mechanism for deadlocking the deadbolt (3) in its operative position, the deadlocking mechanism comprising a pivotally mounted locking arm (71) which is movable between a deadlocking position in which it prevents movement of a rack (62) to retract the deadbolt (3) and an inoperative position in which the rack is free to move, a pivotally mounted tumbler (77) which is spring biased towards a rest position in which the tumbler prevents the locking arm (71) moving to its deadlocking position from its inoperative position and vice versa, and a follower member (76) which moves in response to turning of the key so that when the latter is turned to deadlock the deadbolt, the follower member (76) acts on the tumbler (77) to displace it from its rest position prior to engaging and moving the locking arm (71) to its deadlocking position and then allows the tumbler (77) to return to its rest position, and when the key is turned back to undeadlock the deadbolt, the follower member (76) acts on the tumbler (77) to displace it from its rest position prior to engaging and moving the locking arm (71) to its inoperative position and then allows the tumbler to return to its rest position. The lock may form part of a multi-point locking assembly having at least one additional remote locking device which is actuated simultaneously with the deadbolt. <IMAGE> <IMAGE> |
