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(11) | EP 0 661 409 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Lock and locking assembly for a door or window |
| (57) 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. |