Mortise latch apparatus

摘要

A latch includes a mortise lock assembly having a sliding live bolt and dead bolt. A spindle connected to opposed handles actuates the live bolt. The dead bolt includes a cam restrained by mechanical stops and a follower moving in a limited range of motion in a slot formed in the side of the lock housing. An oval key cylinder engages the cam and is mounted on an escutcheon plate. The key cylinder includes a spindle with approximately one-quarter turn of free relative rotation. The key cylinder spindle mounts to a thumb turn button so that the spindle may be actuated through one-quarter turn by either the thumb turn button or the key cylinder.