Abstract: A dual backset deadbolt assembly comprises a deadbolt mounted in a deadbolt housing for movement to a locking position or an unlocking position, an extension housing having two parallel side walls which are provided with two cam guide slots located at two different backset distances, a transmission plate means having a front engaging member to connect with the deadbolt and a rear forked portion, the rear forked portion having two rearwardly extending strip members and an elongated opening between the strip members, the strip members having at least one pair of engagement members, the engagement members being formed respectively on the strip members, a single cam member mounted in the extension housing and having at least one spindle slot to be put in an alignment with at least one of the cam guide slots, the cam member having at least one pair of camming members which can engage with the engagement members to actuate the transmission plate.

Abstract: An auxiliary lock is disclosed on which it is possible to change its length by turning and moving a combining plate to cause an extensible shell to turn and move around a cylinder so that a projection in the extensible shell may extend into one of two positioning holes in the cylinder to form the short length or in the other positioning hole to form the long length. At the same time, a connecting pin in a deadbolt moves in a U-shaped slot and a reversed U-shaped slot in a moving plate operable by a mechanism in the combining plate.

Abstract: A dual backset deadbolt assembly to be associated with a lock having a rotatable cylinder which has two axially extending crank members for actuating a deadbolt to move in two opposite directions, wherein the deadbolt assembly comprises a deadbolt housing holding a deadbolt, a rear extension housing having two side plates with aligned crank holes therein, a transmission plate having a front end engaging with the deadbolt, and two independently movable axial strip members slideably provided between two side plates on either side of the crank holes provided in the side plates, the strip members being connected to the rear forked portion of the transmission plate and having a plurality of teeth each extending into each crank hole, the strip members being selectable for cooperation with the operative crank member by the engagement of one of the teeth and the operative crank member.

Abstract: An auxiliary lock has a base, an extending shell and a linking arm that, through holes, slots and projections disposed thereon connect adjustably together for lengthening or shortening the assembly while maintaining constant the length of the dead bolt exposed out of a cylinder into a faceplate.

Abstract: This tubular lock has a device that can adjust its size into two kinds for fixing on a door. The device utilizes the movement of an extending plate and an auxiliary plate, changing their positions to either of the two sizes, but the lock still works in spite of the size change.

Abstract: This invention concerns a tubular door lock with a dead bolt adjustable in two sizes without anti-burglary device. It contains an extending shell covering outside of the basic shell and able to move inward or outward so as to alter the length of the dead bolt to the bottom of the extending shell into two sizes--so-called 60 mm and 70 mm--for fixing on a door.

Abstract: This cylinder door lock has a base which contains a guarding plate having two notches--one is to link with a spring plate and a fixing cross pin and the other with a stopping plate. Covering outside of the base is an extending shell which has its bottom wall linked with an actuating plate having its two actuating hooks exposed outside the bottom wall so as to link with the actuating device of the knob. And by means of the extending of the extending shell, the distance between the actuating hooks and the dead bolt is able to be altered.

Abstract: This invention relates to a tubular door lock which mainly includes a basic shell, an extending shell, a dead bolt, two assembling plates, a safety bolt, a locking plate and an unlocking plate. Through apertures, notches and holes disposed thereon, it can connect seletively together in a short (60 mm) or long (70 mm) position, and is therefore able to change the distance between the knob and the faceplate of the lock via adjustment of the extending shell.