Patent ID: 6079757
Filing Date: 2000-06-27
Classification: E05B,Y10T

Abstract:
A door latch having an outside latch operating lever for unlatching the door latch; a locking lever that has an unlocked position where the outside latch operating lever is operable and a locked position where the outside latch operating lever is disabled; an inside lock operating lever for moving the locking lever back and forth between the locked and unlocked positions and an outside lock operating lever for moving the locking lever back and forth between the locked and unlocked position; and a deadbolt locking mechanism for disabling the inside lock operating lever, the deadbolt locking mechanism comprising:the locking lever being a composite locking lever that includes an inside locking lever and an outside locking lever, the inside locking lever being operated by the inside lock operating lever and selectively coupled to the outside locking lever, the outside locking lever being operated by the outside lock operating lever and having an unlocked position where the outside latch operating lever is disabled,a drive member that has a drive position that couples the inside and outside locking levers for concurrent movement so that the inside locking lever can move the outside locking lever along with it from the locked position to the unlocked position where the outside latch operating lever is operable and a lost motion position where the inside locking lever cannot move the outside locking lever with it from the locked position to the unlocked position,a link for moving the drive member back and forth between the drive position and the lost motion position, anda reset member that overrides the link for moving the drive member from the lost motion position to the drive position, the reset member being controlled via the outside latch operating lever.