Latch actuator cam of door locks

摘要

An improvement in a door lock of the type having a rotatably mounted cam which has a detent which serves to displace a latching member and to engage the downstream abutment member of a pair of abutment members which are arranged upstream and downstream of the locking member with respect to the direction of rotation of the actuator cam. The abutment members are mounted on a lever arm which is connected to a locking bolt such that rotation of the actuator cam in one direction or the other will cause the detent to displace the locking member and thereafter engage the downstream abutment member to effect movement of the lever arm which in turn effects movement of the locking bolt between an open position and a closed position and to move the downstream abutment member clear of the path of the detent so as to permit the detent to gain access to the locking member when the direction of rotation of the actuator cam is reversed. The improvement is in the provision of first and second abutments formed on the actuator cam and arranged one on either side of the detent so as to engage the upstream abutment member to arrest the movement of the actuator cam after displacement of the downstream abutment member to the position in which it is clear of the path of travel of the detent such that the rotation of the actuator member is restricted to about 90 DEG .