Abstract: There is described a lock mechanism for fixing to one of a moveable member or frame for locking the moveable member in a closed position in the frame. The lock mechanism comprises a bolt member moveable between a disengaged position and an engaged position for engagement with the frame or moveable member. Drive means are also included for driving the bolt member between the disengaged and engaged positions. First electrical means moveable between a first position and a second position are included and are permanently coupled to the drive means by a linkage for actuating the drive means to drive the bolt member from the engaged position to the disengaged position.

Abstract: There is described a lock mechanism for a leaf hinged within a frame, the lock mechanism comprising a first bolt and at least one further bolt, each bolt being movable between an engaged position in which a distal end of the bolt projects from the leaf and a disengaged position, the bolts being directly driveable together between the engaged and disengaged positions by movement of a common drive member, the first bolt having a proximal end engaged by the drive member and isolating means for ensuring that, when pressure is applied to the distal end of the first bolt tending to move it to the disengaged position, the or each further bolt is not moved to the disengaged position.

Abstract: A lock mechanism comprises at least one bolt member moveable between an engaged and a disengaged position. The latch arrangement prevents movement of the bolt members from the engaged position to the disengaged position. A first operating member for operating the lock mechanism is provided on one side thereof and a second operating member and a latch release arrangement are provided on the other side of the lock mechanism. The latch arrangement responds to movement of the first operating member or the latch release arrangement to release the bolt members and allow movement thereof from the engaged position to the disengaged position. The bolt members are further moveable between the engaged and disengaged positions in response to movement of the first or second operating members.