Patent ID: 6764112
Filing Date: 2004-07-20
Classification: E05B,Y10T

Abstract:
An auxiliary lock comprising:a housing including a circular hole therein, a faceplate being attached to an end of the housing and including an opening, the housing further including a guide member; a casing including a first end and a second end, the first end of the casing being received within the housing and including a first positioning slot and a second positioning slot, the second end of the casing including aligned pivot holes, the guide member being selectively engaged in one of the first positioning slot and the second positioning slot, wherein the housing is movable along a longitudinal direction of the housing when the guide member is disengaged from the first and second positioning slots of the casing, and wherein the housing is not movable along the longitudinal direction of the housing when the guide member is engaged in one of the first positioning slot and the second positioning slot; a deadbolt assembly including a deadbolt, a connecting member, and a pull rod, the deadbolt being received in the housing and slidable between a retracted position in the housing an extended position in which an end of the deadbolt is beyond the housing, the connecting member being mounted to another end of the deadbolt, the pull rod including a first end mounted in the deadbolt and a second end beyond the deadbolt, the first end of the pull rod including at least one guide groove having a longitudinal section and first and second retaining sections transverse to the longitudinal section and in communication with the longitudinal section adapted to confine movement of the pull rod between the first positioning slot and the second positioning slot which is engaged with the guide member and configured to prevent the pull rod from releasing from the deadbolt while the casing is adjusted in the housing, wherein when the connecting member is in one of the retaining sections, the deadbolt is not movable along the longitudinal direction of the housing, and wherein when the connecting member is in the longitudinal section, the deadbolt is movable along the longitudinal direction of the housing relative to the pull rod, the deadbolt and the opening of the faceplate being so configured that the deadbolt turns together with the housing when the deadbolt is in its extended position and that the deadbolt is not turnable when the deadbolt is in its retracted position; a drive wheel including a cylindrical portion that is rotatably held in the pivot holes of the casing, a drive arm extending from the cylindrical portion and having an end connected to the second end of the pull rod such that rotation of the drive wheel causes movement of the pull rod for moving the deadbolt along the longitudinal direction of the housing; and an elastic element having a first end connected to the deadbolt and a second end connected to an end face of the pull rod so that the pull rod is automatically moved from a first backset position to a second backset position when the connecting member is released from the first retaining section of the pull rod, and the deadbolt must be forced to overcome a bias force of the elastic element for moving to a second backset distance when the connecting member is released from the second retaining section.