Patent ID: 7353674
Filing Date: 2008-04-08
Classification: E05B,Y10T

Abstract:
1. A door lock having first and second opposite sides and comprising: a bolt, a follower for moving the bolt, the follower having first and second opposite ends presented towards the first and second sides respectively of the lock and being formed with a threaded opening that is accessible from each end of the follower, first and second torsion units at the first and second sides respectively of the lock and turnably mounted on the first and second ends respectively of the follower, first and second movable coupling members, at the first and second sides respectively of the lock, which are selectively controllable to couple force transmission from the first and second torsion units respectively to the follower, a selecting member that can be installed in the lock on one of the first and second sides of the lock, by engaging the threaded opening of the follower from the first or second end of the follower, such that when the selecting member is installed on the first side the selecting member retains the first torsion unit against turning relative to the follower and permits the second torsion unit to turn relative to the follower, and when the selecting member is installed on the second side the selecting member retains the second torsion unit against turning relative to the follower and permits the first torsion unit to turn relative to the follower, and a means for selectively controlling the coupling member at the other of the first and second sides of the lock, whereby force transmission from the torsion unit at said other side of the lock to the follower is selectively connected, and wherein the first torsion unit is formed with a recess that is shaped to receive a part of the selecting member when the selecting member is installed in the lock on the first side of the lock, for preventing turning of the first torsion unit relative to the follower.