Abstract: Two first engagement members are formed on a first side of a transmission plate of a dual backset deadbolt assembly, while two second engagement members are formed on an opposite second side of the transmission plate posterior to the first engagement members. A first cam drive unit is retained rotatably in a first backset position relative to the transmission plate and is disposed adjacent to the first side. A second cam drive unit is movable between first and second backset positions relative to the transmission plate and is disposed adjacent to the second side. A deadbolt operating spindle of a lock extends through the first and second cam drive units so as to permit engagement of the first cam drive unit with one of the first engagement members in order to actuate the transmission plate when the second cam drive unit is in the first backset position and the deadbolt assembly is adjusted to a shorter backset length.

Abstract: A door lock includes a deadbolt assembly and a lock housing assembly. The deadbolt assembly has a bolt member which includes a metal inner sleeve, a metal outer sleeve fitted over the inner sleeve and made of a material which is different from that of the metal inner sleeve and which has anti-corrosion properties, and a security bar disposed axially in the inner sleeve. The lock housing assembly includes an exterior housing section with a cylindrical chamber that receives rotatably an exterior lock cylinder unit therein. The lock cylinder unit has a key-operated rotary plug with a rearwardly projecting spindle that is connected operably to the deadbolt assembly. An interior sleeve member is formed as a cylindrical wall with a front end which is secured to the rear side of the lock cylinder unit and a rear end which is formed with diametrically opposite notches. The deadbolt assembly extends through the sleeve member via the notches.

Abstract: A face plate includes a tubular member for freely and rotatably receiving a latch housing and having a first end and a second end. An opening is formed in the first end through which a latch bolt passes and has a diameter smaller than an outer diameter of the latch housing. The second end of the tubular member has an inner diameter smaller than the outer diameter of the latch housing. A flange extends radially and outwardly from the first end of the tubular member. The tubular member further has a plurality of axially extending projections formed on an outer periphery thereof.

Abstract: A cylinder lock includes a lock shell which confines a cylindrical hole and a rotatable cylindrical key plug provided within the hole of the lock shell and formed with a longitudinally extending keyway. The key plug is further formed with a plurality of first bores which receive a lower tumbler pin of a respective first tumbler set, while the lock shell is further formed with a plurality of second bores which receive an upper tumbler pin of a respective first tumbler set. A plug retaining sleeve has a front portion which extends into the hole of the lock shell and which confines a hollow space for receiving a rear portion of the key plug. The rear portion of the key plug and the front portion of the plug retaining sleeve are respectively formed with third and fourth radially aligned bores which receive a lower tumbler pin of a second tumbler set.

Abstract: A cylindrical door lock set includes inner and outer knob supporting plates, a turning mechanism, an annular mounting plate and a latch unit. The outer knob supporting plate has a central hole and an inner side provided with a pair of posts on two sides of the central hole. The posts are hollow and are threaded internally. The turning mechanism is supported on the inner side of the outer knob supporting plate and is provided with a turn shaft. The annular mounting plate is secured on the inner side of the outer knob supporting plate and is formed with a pair of mounting shafts and a central hole to permit the turn shaft of the turning mechanism to extend therethrough. The latch unit is formed with a shaft engaging hole to permit the turn shaft to extend therethrough, and two side holes disposed on two sides of the shaft engaging hole in a lengthwise direction of the latch unit to receive respectively the mounting shafts. The latch unit is disposed between the posts of the outer knob supporting plate.

Abstract: A lock set for use with a deadbolt which includes an improved spindle mechanism is disclosed. The improved spindle mechanism permits the lock set to unlatch the deadbolt by rotating an inner knob without the need to operate a spindle-turning button.

Abstract: A cylinder lock has a cylindrical plug which is formed with a longitudinally extending keyway and which has a plurality of pin tumblers extending into the keyway. Each of the pin tumblers has a cylindrical outer part and a concentric inner part telescopically slidable within the outer part. A key is inserted into the keyway and has a tumbler activating side which is formed with a longitudinally extending groove, a groove base having projections and/or recesses formed therein and a pair of upwardly extending key blades joined by the groove base. The inner part of each of the pin tumblers has a distal end which extends into the groove and which engages a corresponding one of the projections and/or recesses. The key blades are formed with matching key bit grooves which engage the outer parts of the pin tumblers.

Abstract: A code lock includes an intermediate bead seat, upper and lower bead seats, all of which are provided with tumbler bead holes receiving tumbler beads. The upper and lower bead seats are slidable relative to the intermediate bead seat between a normal position in which the bead holes of the upper and lower bead seats are aligned with first bead holes of the intermediate bead seat and a resetting position in which the bead holes thereof are aligned with second bead holes of the intermediate bead seat. The combination of the tumbler beads can be changed by using a code key which selectively transfers some tumbler beads from the first to the second bead holes.

Abstract: A latch bolt operating device incorporating lever handles and rotary plates cooperatively rotatable with the lever handles to control the angle of the rotation of the handles. The device is provided with a simplified privacy lock mechanism to prevent the opening of a door at one side thereof. The lock mechanism is directly mounted to the assembly of the lever handles, thereby eliminating the need of an additional housing to hold the mechanism. One of the rotary plates is provided with a cam face to actuate a lock shaft of the lock mechanism. The lock shaft is telescopic so that the device accommodates door panels of different thickness.

Abstract: An improved duplex latch-bolt mechanism is composed of a latch-bolt head assembly and a latch-bolt transfer device adapted to make a selectable connection with a standard latch-handle assembly having a square transfer member and a pair of cylindrical support nuts provided for use in a door fitting arrangement.

Abstract: In a lock handle assembly, a lever handle has a rotary shaft to actuate a deadbolt which latches a door. The angular movement of the lever handle is limited by a mechanism including a rotary plate having radially projecting engaging members and mounted on the shaft, a fixed stop member to limit the forward movement of the rotary plate and a releasable stop member to limit the backward movement of the rotary plate. The shaft of the handle is detachably mounted to a casing by being fitted in a sleeve which in turned is mounted to the casing, thereby facilitating the replacement of the handle of the assembly.

Abstract: The invention relates to improvements for an adjustable dead bolt assembly which includes an adjustable bolt extension member connected to a bolt and an extension housing connected to a bolt casing for accommodating the bolt extension member, wherein the bolt is provided with a uniform height and width throughout the length of the bolt for reducing the cost of the material and simplifying the processing steps.

Abstract: A cylinder lock which includes pin-tumblers to lock a cylinder against rotation relative to a housing, wherein the pin-tumblers and tumbler bores are arranged such that the axes thereof lie in different parallel longitudinal planes normal to a diametrical plane of the cylinder and each tumbler bore receives a plurality of pin-tumblers.

Abstract: The mechanism is used with a latch-bolt unit (including a latch-bolt head) and a latch-handle assembly, for installation in a door. The novel mechanism includes a retracting member (connected to retract the latch-bolt head), with two different sets of extracting teeth to accommodate two different standard door-lock backset configurations of standard commercial doors. A connecting device, made up of first and second coupling members as well as a movable configuration-selector plate, is connected at the rear of the latch-bolt unit. The connecting device has two different sets of screw openings and clearing spaces. Its selector plate selectively effectuates either of these two different sets of connecting points, corresponding to the two standard backsets. The selector plate is thus used to adjust the latch-bolt mechanism quickly and easily, to accommodate the preferred door-lock backset--without any modification such as cutting or bending.