Abstract: A cylinder lock with a shell defining a plug cavity, a plurality of locking shell tumblerways, and a control shell tumblerway. A plug is rotatable within the plug cavity and defines a plurality of locking plug tumblerways alignable with the locking shell tumblerways, a control plug tumblerway alignable with the control shell tumblerway and a keyway for receiving keys. Positioned within each of the locking plug tumblerways is a locking tumbler that is biased into an active position wherein it projects into one of the locking shell tumblerways and movable into an inactive position out of the tumblerway by a proper key in the keyway. The locking tumblers prevent rotation of the plug when in their active positions and allow rotation thereof when in their inactive positions. Retained by the control plug tumblerway is a control tumbler biased in a latched position and movable into a release position by a control key in the keyway.

Abstract: Anti-theft device for nuts/screws of automobile wheels, comprising a barrel (10) rotatably subassembled with a lock cylinder plug (18) the tumblers (24) of which are placed in position by simple insertion of the key (23), which key, however, once inserted and turned, cannot be withdrawn inasmuch as a projection (28) on the key (23) then lies behind a shoulder (20) on the barrel. This subassembly may be rotatably locked upon the fastener element or removed therefrom using but one hand.

Abstract: A lock having a key-controlled removable and installable plug including: a plug including a set of combinating tumblers and a control tumbler including a retaining end and a second end; in a first state the retaining end being extended and the second end being retracted relative to the plug and in a second state the retaining end being retracted and the second end being extended relative to the plug; means for biasing the control tumbler to one of the states, the control tumbler including means for engaging with a key to drive the control tumbler to the other state; and a shell for rotatably receiving the plug and having a peripheral groove for receiving the retaining end of the control tumbler in the first state and preventing longitudinal withdrawal of, while permitting rotation of, the plug in the shell; and a longitudinal groove for accommodating extension of the second end in the second state and enabling withdrawal and installation of the plug when the second end is aligned with the longitudinal groove.

Abstract: A key-changeable lock core of FIG. 8 cross section has a core body with key plug and pin tumbler housings, and a key plug supported for rotation in the key plug housing. A control element, desirably a sleeve about the key plug having a thick top segment carrying a core-retaining lug, is mounted in a core-body recess for rotation between a core-locking position and a lug-retracted position. Its inner face defines an operating shear line at the surface of the key plug, and its outer face defines a control shear line at the top face of the recess, which is preferably a flat planar face. The outer face of the control element has an arcuate portion in the vicinity of the pin tumbler barrels on a radius of curvature about the axis of the control element, and has a planar face portion extending toward the retaining lug in diverging relation with such curvature, preferably tangentially therefrom.

Abstract: A removable core cylinder lock utilizing twisting tumblers and a latch bar provides maximum security. Both operating and control keys have at least one skew cut bit to operating the twisting tumblers. A centrally positioned cylinder retainer is rotatable with a control key to remove the lock from its shell.

Abstract: A cylinder assembly complete with cylinder plug is located within the outside door handle of a lockset. A washer having a diameter greater than the diameter of the plug is mounted on the rearmost portion of the plug so as to form a shoulder portion. A slot is cut in the shoulder portion flush with the outside diameter of the plug. A spindle extending into the outside handle portion contains a boss on the inside portion extending radially towards the center of the handle a discrete portion substantially equal to the shoulder formed by the washer attached to the plug. The boss is located on the spindle side closest to the latch. The complete cylinder assembly is inserted into the outside handle with the door handle turned in a first direction and the plug rotated by the key in the opposite direction thereby turning the tailpiece until the slot on the shoulder is aligned with the boss on the spindle.

Abstract: A key-removable lock core of the same size as a standard core, to fit standard core receptacles, and having a key plug of improved pull resistance. The core body of figure-8 cross section has a key plug lobe which contains a sleeve having a core retainer lug movable by a control key between a projected core retaining position and a retracted core release position. A key plug having an enlarged rear head is inserted from the rear into the cylindrical bore defined by the sleeve, with the head overlapping the rear of both the sleeve and the key plug lobe of the body. A segment is inserted in a slot traversing the key slot and is trapped therein by the sleeve to form a key stop. The key plug is held in place by a C-shaped retaining ring in a circumferential groove in such plug at the front face of the body, and is trapped in place by a face plate fixed to the body by a blind annular rivet.

Abstract: Disclosed is a cylinder lock with an annular housing defining a cavity that retains a lock core formed by a cylindrical plug within an annular shell having an internal longitudinally directed shell spline. The plug is retained within the annular shell in a locked position and is rotatable therein in one direction to an open position and in the opposite direction to a release position. A plurality of locking tumblers are retained by the plug and engage the shell spline to prevent rotation of the plug from its locked position unless the locking tumblers are withdrawn from the shell spline by a properly bitted key inserted into a keyway defined by the plug. Coupled to the plug is an actuator member that moves a locking member between latched and unlatched positions in response to rotation of the plug.

Abstract: A changeable plug exposed shackle padlock comprising a padlock casing and a U-shaped shackle having legs with locking notches interfitting in sockets in the upper end of the casing. A key lock plug is removably received in a plug cavity in the casing and an elongated slideway cavity overlying the plug cavity extends through one end of the padlock casing outwardly adjacent the socket for the shorter leg and receives a reciprocative slidable cover member in its upper portion extending in covering relation over the plug cavity with a hole for the shorter shackle leg registering with the socket for that shackle leg when said slide member is in covering relation to the plug cavity. A slidable bolt plate member is guided for longitudinal sliding movement between locking and release positions in the lower portion of the slideway and has locking shoulders engageable in the locking notches of the shackle legs as is driven from the key lock plug.

Abstract: An adaptation for a mortise lock having a double-ended primary lock "cylinder" of "keyhole" cross-section mounted through a conforming opening in the mortise lock case, provides for use of key-removable lock cores and increases security by preventing removal of the lock cylinder except after removal of a core with a special control key. Two key-removable cores are mounted in chambers at opposite ends of a housing which fits through the cylinder-receiving opening of the mortise lock case. A bolt-actuating cam between the chambers lies within the case and is alternatively engaged by shuttle throw plug members respectively moved to engaged position by thrust of a key in one of the cores and is operated by rotation of such key. The cores require a special control key for removal and are shaped or mouned so as to project laterally from the lock cylinder and thereby to block passage of the cylinder out of the conforming opening of the lock case until removed by a control key.

Abstract: The following specification describes a plurality of combination lock cylinders, each of the axially movable tumbler pin type and each having a drive plate initially rotatable in a selected one of two directions by the tumbler operating pins of a respective operating key to control a bolt. A lock cylinder extraction key having tumbler pins universal to each lock cylinder rotates the drive plate in the direction opposite the selected direction to align a slot in the drive plate with a boss in the housing for enabling removal of a respective lock cylinder from its housing.Each lock cylinder has one pair of bayonet slots extending in the selected direction and engaged only by bayonet pins on the respective operating key for enabling rotation of the drive plate only in the selected direction and another pair of axially offset bayonet slots extending in the opposite direction and engaged only by bayonet pins on the lock cylinder extraction key to enable rotation of the drive plate only in the opposite direction.

Abstract: A cylinder lock with a hollow cylindrical shell that defines a plurality of shell tumblerways and is longitudinally movable in a shell cavity defined by a housing. Received by the hollow shell is a plug that defines a keyway for receiving a proper key and a plurality of plug tumblerways aligned with the shell tumblerways. The plug is rotatable within the shell but is longitudinally restrained therein. A plurality of locking tumblers are accommodated by the aligned shell and plug tumblerways and are movable from biased locked positions into open positions by a proper key in the keyway. Also responsive to a proper key is a control tumbler that can be moved out of a biased, latched position into a release position. The control tumbler obstructs longitudinal withdrawal of the shell from the shell cavity when in its latched position and permits withdrawal when in its release position.

Abstract: A door lock for motor vehicles, in which a lock cylinder is connected with a lock tumbler by way of an insertable entrainment rod, whereby the lock cylinder is inserted together with a door handle into an aperture provided in the outer body panel of the door; an anti-theft device which is connected with the lock cylinder, engages from behind a locking projection provided at the door.

Abstract: For use in a lockset there is provided a cylindrical housing having a projecting wing and having a bore concentric with an axis. An axially extending rib projects into the bore. A first tumbler mechanism is disposed largely in the wing portion of the housing and includes first tumbler chambers extending through the rib to the bore. A plug is rotatable in the housing about the axis. The plug includes a plug shell and a plug core normally interfitted and axially separable. The plug shell has an axially extending recess therein open at one end. The plug has an adjustable cap adjacent one end and a disc on the other end to limit axial movement. The plug core has a second tumbler mechanism cooperating with the first tumbler mechanism and opening into a keyway therein. The plug core is receivable in the plug shell recess and has a lug on the end opposite the disc interengaging with an inturned flange on the housing to limit withdrawal movement of the plug core in all except one rotary position.

Abstract: A cable lock has a key-removable core of figure-8 shape mounted in a two-lobe axial chamber at one end of a lock body. The key plug of the core drives a rotary bolt mounted in a blind extension of one chamber lobe. The bolt releasably locks one cable end member inserted in a blind axial bore at the other end of the body, which bore is parallel with and overlaps the extension and lies opposite the second lobe of the core chamber. The other end member of the cable is inserted in a transverse blind bore located axially between the second chamber lobe and the axial cable-receiving bore, and is secured by a retaining pin inserted through the core chamber and concealed by the core in such chamber. In one modification, insertion of the releasable cable end member requires key actuation of the core.

Abstract: Disclosed is a bar-tumbler type safety lock, as well as a key and a coding process for said lock. According to a single-key-entry embodiment, this lock comprises a body, a two-piece washer, a latch holder and a barrel having recesses in which notched tumblers can slide and which is maintained rotatingly and removably toward the front of said body by a stud and a stopping finger retained in two annular slots made radially in this body and which can be retracted by the introduction of a special extraction key into the lock; the coding of the lock is obtained by the forming, in the annular washer-assembly groove, of notches simultaneously in each of the tumblers by a conventional turning process, with the key inserted.