Abstract: A high security deadbolt assembly for a door which bolt has a housing extending from the edge of the door inwardly of the transverse bore between the door surface. A deadbolt is reciprocable in the housing and has a recess at its inner end. A cylindrical drive member is rotatively supported in the housing and is located with or is aligned with the deadbolt recess. The drive member carries a stop and is connected to the bolt by a linkage. When locked, a substantial portion of the length of the bolt remains engaged in the bolt housing and door so that attempts at forcing the bolt to the unlocked position are resisted by the stop which stop engages an internal surface of the bolt recess. The components are made from high strength materials and the deadbolt assembly may be retrofit to existing lock cylinders with a minimum of installation modifications.

Abstract: The adjustable latch bolt of this invention features a novel cam actuating assembly which permits election of one of two door knob spindle backsets which are in standard usage. The cam assembly is comprised of two half hubs, each having one arm so that one half hub operates the drawbar in one direction of rotation and the other in the opposite direction of rotation. The half hubs are formed so that a portion of one half hub nests in a depression in the other in such a way that the two half hubs can rotate relative to each other. When the hubs are set to one of two backsets and are in a position to actuate the drawbar, non-circular openings passing through the axis of rotation of the two hubs are aligned so that a complementary shaped spindle can pass through both hubs and engage them for rotation. With the spindle in place the two half hubs are prevented from rotation relative to each other.

Abstract: A lock cylinder for use with either a deadbolt lock or a key-in-the-knob lock. The lock cylinder includes a hollow cylindrical body having a radially projecting, pin-containing chamber, extending along the length of the body, and a cylinder plug rotatably accommodated within the body. The plug holds a series of pins, which can be brought into alignment with the pins in the chamber, and the plug has a slot for accepting a key. Two tailpieces are provided, either of which may be alternatively secured to the cylinder plug in non-rotatable relationship to the plug. One of the tailpieces is cooperable with the mechanism for operating a deadbolt lock, and the other tailpiece is cooperable with the mechanism for operating a key-in-the-knob lock. One end of the cylinder plug is formed with a transverse slot and an annular slot, an extension at one end of each tailpiece fitting into the transverse slot, and a resilient snap ring fitting into the annular slot to prevent separation of the tailpiece from the plug.

Abstract: A lock intended, for example, for a door and comprising a lock bolt and a knob, handle or corresponding device (4) and an electrically actuable coupling arrangement (7, 8, 9) arranged through the agency of an electric signal to connect the knob to the lock bolt, so that the lock bolt can be moved to a lock-release position by rotating the knob, but which in an electrically non-activated position is disengaged so as to prevent the lock bolt from being manipulated by rotation of the knob.