Abstract: A mortise lock having an entrance and apartment function and including a spring projected latch bolt, a latch bolt retracting mechanism having an L-shaped retractor rectilinearly moveable in response to rotation of either an inner or an outer rollback hub, a snap action toggle operated stopworks for locking the outer rollback hub, and a deadlocking mechanism including a deadlocking lever controlled by an auxiliary bolt and moveable into and out of blocking relation with the latch bolt in its projected position. An abutment on the deadlocking lever cooperates with an abutment on the lock case when the deadlocking lever is in its deadlocking position to resist transmission of force applied to the latch bolt in a retracting direction.

Abstract: A mortise lock operated by a two-directional inner knob and an outer lever handle has means within its case to limit rotation of the outer lever handle in one direction. An auxiliary hub spring also contained in the case and associated with the outer rollback hub provides additional yieldable resistance to rotation of the lever handle in said one direction to compensate for the movement of the lever handle which results from its radially offset center of gravity. The auxiliary hub spring also provides additional reactive torque to compensate for increased mechanical advantage attained through utilization of a lever handle.

Abstract: A mortise lock case having a body including top and bottom walls and an angularly adjustable front attached to the body by upper and lower tabs carried by the front and secured, respectively, to the top and bottom walls by associated fasteners. The top and bottom walls have integral forwardly projecting tongues received in associated slots in the front. Each tongue has fulcrums at its opposite sides engageable with the side walls of the slot in which it is received. Each fulcrum cooperates with an associated slot side wall to provide pivotal support for the front whereby to facilitate angular positioning of the front relative to the body of the case.