Patent ID: 6612142
Filing Date: 2003-09-02
Classification: E05B,Y10T

Abstract:
A safety deposit box lock assembly comprising:a housing; a latch bolt carried by the housing and moveable between a fully extended locked position and an unlocked position; a guard lock movable by a guard key between an unsecured orientation permitting movement of the latch bolt to the unlocked position and a secured orientation prohibiting movement of the latch bolt to the unlocked position from the extended locked position; a patron lock moveable by a patron key between a latched orientation that moves the latch bolt to the locked position and an unlatched orientation that moves the latch bolt to the unlocked position only when the guard lock is in the unsecured orientation; and wherein the guard key can be inserted into and removed from the guard lock both when the guard lock is in the secured orientation and in the unsecured orientation and wherein removal of the guard key in the unsecured orientation of the guard lock will not prevent movement of the latch bolt to the unlocked position from the fully extended locked position.