BigPatents India

A door lock with controllable handle operation including a bolt (3), a follower (5) for moving the bolt and an operation axis (4), on both ends of which an actuator can be installed for operating the follower (5), whereby force transmission from either side of the lock to the follower (5) is established by means of movable coupling members (lOa, lOb), which are controlled by a solenoid arrangement (8, 9) or the like, and in which the follower (5) is provided with two separate torsion units (6a, 6b) installed on the operation axis (4) on different sides of the follower (5) and turnably secured thereto, which units can be connected to force transmission with the follower (5) by utilising said coupling members (lOa, lOb). The door lock comprises a selecting member (7) movable from one lock side to the other, which member retains the torsion unit (6a, 6b) selected in each case to be unturnable with respect to the follower (5), so that force transmission from the operation axis (4) to the follower (5) is connected on that particular side of the lock, and on the other side of the lock, force transmission from the operation axis (4) to the follower (5) can be selectively either connected or disconnected by means of said coupling members (lOa, lOb) under the control of the solenoid arrangement (8,9).