Abstract: A latchbolt rim lock of simple sturdy construction with smooth effective operation and long life. A die cast case forms guides for a bolt having a head and draw plate, and has U-shaped ribs on its rear wall to define seats for springs biasing the bolt forward, in which the springs are held by a rear flange on the back plate. A rearward boss on the front wall forms a retraction stop for the bolt and contains a headed holdback plunger which is manually movable into a hole in the bolt where it is latched by its head to hold the bolt retracted. The draw plate contains a cam opening which defines opposite cam faces which are engaged by a crank pin to retract the bolt. The cam opening also has a central pin-passing throat which allows cammed retraction of the latchbolt relative to the crank pin, and defines supplemental cam faces for moving the bolt to release the holdback plunger.

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.