Abstract: An improved device for preventing unauthorized opening of a combination lock of the type having a plurality of tumbler wheels in conjunction with a fence-lever-actuated bolt in which a tumbler wheel assembly shield having an opening to avoid a rearward expulsion of the dial shaft provides a barrier to unauthorized rearward or radial manipulation of the tumbler wheel assemblies by use of fishing hooks inserted and manipulated from the front of the lock.

Abstract: An anti-theft device for mounting on a steering columm of a vehicle to prevent the unauthorized use or theft of the vehicle. The device includes two semi-circular rigid band portions hingedly joined along adjacent edges. The band portions may be permanently secured in the steering column in close surrounding relation by one or more fasteners engaging opposing flanges on the opposite end edges of the band portions.

Abstract: A stainless steel guard plate for preventing forced entry into certain automobilies by forcing a screwdriver between the door handle mechanism and the outer door panel to unlock the door is retrofitted to the automobile. The handle mechanism is removed from an opening in the door. The guard plate includes a stainless steel plate having an aperture through which an operative portion of the handle mechanism extends, with side flanges of the guard plate extending inwardly along the upper and lower edges of the guard plate aperture and through the original opening in the door panel. A first screw which is accessible through a rear end plate of the door when it is opened, passes through a hole in an inwardly extending tab of the guard plate and into a threaded hole in a tongue member of the handle mechanism. The first screw is tightened, drawing the rear portion of the handle mechanism tightly against the guard plate, pressing it tightly against the outer surface of the door panel.

Abstract: A shrouded track slide bolt which is very difficult to breach including an anti-saw spindle inserted into the bolt where it bridges the gap between the door and the door jamb. If a saw is inserted into this gap the saw will stop cutting when it hits the anti-saw spindle which rotates freely. The mechanism consists of a fixed block and a sliding block with an attached dead bolt. If a saw is insertd into the gap between the blocks, a bolt collar will rotate making sawing impossible. At all other points the bolt is surrounded by massive case hardened steel blocks. A key system is provided so that a key is necessary to activate the bolt and the key may only be withdrawn if the bolt is fixed in either the fully extended or fully withdrawn position. A door jamb reinforcing insert is provided to strengthen the door jamb.

Abstract: A tamper resistant reciprocal cylinder lock comprising mutually engageable structures on the lock sleeve and bolt keeper having the capacity to increase the resistance of the lock sleeve forward portion from disengagement with the lock sleeve inner portion when the lock and keeper mechanism in a locked position are under physical attack.

Abstract: A protective jacket is disclosed for the steering column of an automotive vehicle of the type in which a breakable cover encloses an internally mounted steering wheel locking means, and has ignition key means mounted on the opposite side of the turn signal lever. The jacket includes a pair of jacket members hinged together so that they can be readily mounted on the steering wheel column. A padlock connects the two members together so that the protective jacket can be removed when the vehicle is sold, however, it normally is locked in position permitting the user to operate both the ignition system as well as the turn signal lever.

Abstract: A lock assembly of the type mounted on a door or like closure structure and including two lock cylinders each at least partially encased and surrounded by a casing structure each of which has reinforcing means formed thereon so as to prevent collapse or destruction of said casing structure upon receiving an extreme force such as a blow with a hammer or the like. An activating structure is interconnected between a bolt element and each of the lock cylinders such that rotation of either lock cylinder, as by a key, causes at least partial rotation of the activating structure and linear movement of the bolt element into either an extended or retracted position.

Abstract: A method of disabling various types of lock cylinders in General Motors motor vehicles is provided and consists of using two different types of guide tools that have key portions for engaging keyways of the lock cylinders so that either a drill bit or an elongated hole saw can engage one of the guide tools to disable the lock cylinders.

Abstract: A security device including a sleeve adapted to fit over the body portion of a padlock and provided with slots or apertures to permit closing or locking of the sleeve with the sleeve enveloping the padlock body. An internally accessible pocket is provided in one internal face of the sleeve to receive a key or other object to be secured. The presence of the padlock body in the sleeve prevents access to the pocket. A window may be provided in one of the sleeve walls to provide access to the padlock release mechanism such as a combination mechanism or keyhole.

Abstract: A door stile lock has a rotary latch bar. The rotary latch bar contains a compression loaded anvil within its interior. The latch bar rotates about the lock cylinder housing. The housing is provided with retention ports for engaging the compression loaded anvil at selected positions to inhibit rotation of the latch bar when the anvil is so engaged. Interior of the cylinder housing is an actuator rotatable by the lock key. The actuator raises the anvil from the retention ports and drives the latch bar about the axis of the cylinder housing between nominal locked and unlocked positions of the latch bar. The compression loaded anvil engages the retention ports in the cylinder housing at both the nominal locked and unlocked positions. A lock body engages the cylinder housing in a non-rotating manner. The lock body is then compressively engaged within the door stile.

Abstract: A gate locking system for securely locking a rolling type gate in a closed position within an opposing pair of U-shaped channel guide rails. The guide rails include aligned apertures formed through opposing front and rear walls. The gate also includes an aperture which is aligned with the guide rail apertures when the gate is in the closed position. A guard plate is positioned exteriorly of the guide rails and also includes an aligned aperture. An elongated member of a lock is inserted through the various apertures to lock the members together in the closed position. The head of the lock is retained exteriorly of the guard plate while the distal end of the lock extends beyond the rear wall of the guide rail. A securing member cooperates with an extended end of the elongated lock member to retain the lock in a clamped position between the opposing walls of the guide rail so that the closed gate is captured therebetween. The securing member is under the operative control of a rotatable portion of the lock.

Abstract: A padlock shackle made of an inner core of ductile nickel-titanium alloy, outer casing of hardened stainless steel, and an intermediate layer of a composite of tungsten carbide particles in a nickel-titanium alloy matrix which is bonded to the nickel-titanium alloy core and mechanically bonded to the stainless outer casing.

Abstract: A locking device to be locked onto the kingpin of a trailer to prevent its being engaged by the fifth wheel of an unauthorized tractor. The locking device closely encircles the kingpin and houses within an aperture a locking bar that is adapted to be pressed into engagement with the kingpin recess or groove. The outer wall of the locking device casing has a protrusion in the area of the locking bar aperture such that the locking bar and the locking unit disposed therein are recessed within the aperture and thereby protected. The locking bar aperture from the outer end of the locking bar when in the locked position to the outer wall of the protrusion on the casing is counterbored beyond the transverse cross-section of the locking bar.

Abstract: A pop-out T-handle assembly of the type containing a lock cylinder having high security features which defy forced entry is disclosed. A cylinder front handle and cylinder/extension housing are assembled around the cylinder lock and rigidly secured for protection against pulling the lock. The face of the cylinder lock is preferably protected by a freely rotating cylinder protector plate to protect against drilling into the cylinder lock. A locator tab and slot arrangement assures alignment of the cylinder lock bolt and a corresponding opening in the T-handle housing, as well as restricts lateral movement of the cylinder front handle within the T-handle housing to protect against prying. A T-handle clutch arrangement of a generally square configuration provides extensive bearing surface to absorb torque and prevent wear.

Abstract: A lock box and method of making same are provided wherein such lock box is mountable in an aperture of a cabinet wall and comprises; a coin receptacle dimensioned for passage through the aperture and having an open top and a front wall portion; a face member having a bore therethrough, a peripheral edge, and an inside surface; removable fasteners for fastening the receptacle to the face member by fastening the front wall portion thereto; at least one locking bolt carried by the face member and being movable to extended and retracted positions relative to a portion of the peripheral edge of the face member to engage a portion of the cabinet wall and fasten the lock box thereto upon extension of the bolt; a lock assembly carried by the face member and provided for operating the bolt with the lock assembly being accessible by a key through the bore; and the lock box includes dual purpose components for supporting the entire lock assembly inwardly of such inside surface and protecting same against removal thereof

Abstract: Each side of a door opening, e.g., a hinged door and a jamb, or two sliding doors, is provided with a protective hasp for a lock body and shackle of a lock. Each half of the hasp is so formed that, when mated, as on joining of the doors or closing of the doors, provisions are made for insertion of a lock body into the protective hasp, and insertion of a shackle through the hasp and the lock body to lock the closure.

Abstract: A device is disclosed which is mounted to a door over an independently mounted lock to prevent separation of the lock from the door. In one embodiment, the device comprises an interior plate having a recessed portion and flange portions, which is fastened to the interior of the door by bolts passing through the door with the recessed portion covering the lock. The plate holds the lock against the interior of the door and prevents its separation from the door when forces are applied to the lock from the exterior of the door via the lock cylinder or directly to the lock after the cylinder has been removed. In another embodiment, the device also comprises an exterior plate mounted to the exterior of the door covering the heads of the bolts used to mount the interior plate to the door.

Abstract: Disclosed is a combined gate and lock assembly of tubular construction comprising two horizontal female members fixed to two vertical posts pivotally mounted with respect to support structure. In the closed position, the longitudinal axes of the female members are aligned and receive coaxially in recipro cable relationship therein a male member having an eye engaged by the shackle of a padlock. In the open position, the male member is appropriately disengaged from one of the female members which are disposed in their open position by appropriate rotation of their vertical posts.

Abstract: A flange lock for preventing unauthorized access to flanged connections, comprises a pair of semi-cylindrical shells having face plates at at least one end thereof. The shells are hingedly interconnected by a tongue on one that passes through a slot in the other. At their free ends, the shells carrying three sleeves that align with each other in the closed position of the device, two sleeves on one shell and a third sleeve that fits between the first two, on the other shell. A screw-threaded nipple passes through two of the aligned sleeves in the closed position and is screwed into the end sleeve; and a screw type cam lock has a rod that passes through the nipple and screws into a plug carried by the end sleeve. The cam lock is non-rotatable relative to the nipple but its rod can be rotated to screw into and unscrew from the plug, thereby respectively to lock and release the assembly, when a key is inserted in the cam lock.

Abstract: A rim cylinder protection unit includes a single flat thick solid hardened steel guard plate counterbored to receive the rim of the cylinder. The cylinder is secured to the plate and prevented from rotation by cooperation with a cylinder retaining plate attached to the backside of the guard plate. The thick solid steel guard plate has heavy mounting studs welded by hardened material to the plate to extend through the door and these studs are protected by hardened steel sleeves to prevent burglars from chiseling through the studs. A replaceable cover conceals the rugged steel guard plate.

Abstract: A lock and door reinforcing plate device comprising plate members adapted to be secured to the opposite faces of the door by common bolt members which extend through the plates and the door and the lock assembly, a tube member is secured to the inner face of one of the plate members and extend through the door for encasing the usual lock cylinder assembly, the lock cylinder assembly is secured to one of the plates and is disposed within the tube in a manner substantially precluding unauthorized tampering or removal of the lock cylinder assembly thus substantially precluding unauthorized unlocking of the lock assembly.

Abstract: The lock comprises, integrated in the lock (V), mechanical safety means, an electric motor (2), a control module (1), one or more small switches (9) for communicating the position of the bolts (7), one or more detectors (10, 11) for detecting the open or closed state of the door, and the degree of impacts received by the door. The shaft of the motor (2) is parallel to the longitudinal axis of the bolts (7) and the bolts (7) are guided by apertures formed in branches of a U-shaped element (3) and are driven in translation by a driving member (6) but are free to rotate about their axes. The invention is applicable to electronic locks.

Abstract: High security lock assembly adapted for locking two flanges together. The lock assembly includes a lock body having flange retaining walls which define a flange receiving opening. A latch bolt is provided which is slidably mounted transverse of the flange receiving opening for locking to the flanges when they are disposed within the flange receiving opening. A removable shield is provided for removably attaching to the lock body for covering the flange receiving opening thereby preventing external access to the latch bolt when the lock assembly is locked to the flanges. The lock assembly further includes a lock cylinder and associated lock cylinder housing wherein the lock cylinder housing cannot be removed from the lock body except upon special key actuated release. An acid actuated relock mechanism is also provided for blocking movement of the latch bolt when acid is applied in attempts to overcome the lock assembly.

Abstract: A protective lock mounting plate is provided between a lock housing on the interior of a safe door and the interior surface of the safe door to resist drilling into the lock housing through the door in areas adjacent a combination dial, or the like, on the exterior of the safe door in a frontal location relative lock works within the lock housing. Non-drillable material is positioned in annular rings bonded in grooves of concentric circular configuration formed in a surface of the mounting plate which is directed against the interior surface of the door facing in the direction from which drilling intrusion is anticipated.

Abstract: A protective doorknob encasement device which provides a protective cover over the space formed between a door jamb and an exterior doorknob to prevent insertion of a tool to forcibly open the door. The invention includes a mounting plate and a track guide to enable slidable attachment of a protective casement. The track guide is configured so as to orient and restrict movement of the casement along the track and only in a direction toward the exterior door surface. Removal of the casement is permitted by its continued forward motion along the track and is only possible when the door is open. This unidirectional forward motion results from use of spring-biased pawls coupled to the casement which catch in corresponding grooves set in the mounting plate to prevent rearward motion. An opening is provided in the casement in alignment with a key slot of the enclosed doorknob to permit normal access.

Abstract: A lock bar for securing a pair of door panels having lock and hinge edges in a locked position and indicating whether or not the panels are locked, including a pair of elongated hollow holding brackets having a rectangular cross section aligned horizontally and secured to the door panels adjacent the lock edges thereof, and an elongated, hollow, rectangular cross section, cross bolt extending horizontally through the holding brackets.

Abstract: A guard for protecting the cylinder of a door lock from removal comprises a substantially rectangular plate having a first portion including a section adapted to fit over the lock cylinder and a second portion offset from the first portion, the second portion traversing the gap between the door and the doorjamb for protecting the bolt.

Abstract: The door of a security enclosure has boltwork and a primary lock for locking the boltwork in its thrown condition. A drill-resistant disc is rotatably mounted between the lock and the exterior of the door, and the restraining wire of a relocker passes over the circumference of the disc. If a drilling attack is made on the lock the disc will be encountered and will be rotated by the drill tip to frustrate penetration of the disc by the drill. Furthermore, if the drill is aimed at the circumferential portion of the disc which guides the relocker wire any success in penetrating the disc will sever or dislodge the wire to allow the relocker to move under the action of a spring into a position in which it provides an additional locking action in the boltwork.

Abstract: A safety lock is provided with two plate assemblies, the first to be mounted on the outside of the door leaf and the second on the inside thereof. Each one of these plate assemblies comprises a first plate adapted to be placed on the side of the door leaf and having a first opening for receiving an actuating mechanism, a second opening housing a transmission gear mechanism, and corner holes for passing fasteners which hold the two plate assemblies together. A second plate is on the outer face of the first plate which comprises holes providing bearings for each gear of the transmission mechanisms as well as holes wider than the ends of the fasteners for housing the same therein. A third plate is spot welded on the outer face of the second plate and prevents access to the transmission mechanism. In the outer plate assembly, this third plate covers the ends of the fasteners and has only one hole, shaped in correspondence with the respective key hole opening of the cylinder lock.

Abstract: In order to lessen the cost of manufacturing padlocks, the body of the padlock is made of a shell of hardened steel and has two holes in one wall for the reception of the legs of the shackle, a core with corresponding bores for said legs and for a locking mechanism made of a soft alloy, the bores for said legs within the core being partially lined with hardened steel inserts facing the open ends of said shell, said inserts holding said core within said shell. The core may be cast, extruded or may be made by sintering.

Abstract: A security plate for entrance doors adapted to be secured by tamper resistant fasteners to the stop member of a door frame. The plate is elongated to extend above and below the lock area of the door. The plate has a relatively thick flat edge that abuts a closed door and the plate is formed with a concave portion adajcent the thick edge and connected thereto by a smooth tool-deflecting ramp.

Abstract: A shielded lock assembly suitable for joining first and second members together comprises in combination a shackle-bearing element having a body portion and a shackle carried thereby, and a lock body having a keyhole and having a shackle-receiving aperture opening in a given direction and adapted to receive and releasably retain the shackle therein. A housing is adapted to be secured to the first member, said housing defining an enclosure adapted to receive the lock body and having access openings communicating with the aperture and the keyhole, respectively. Means are operatively connected to the housing and engageable with the lock body for retaining the lock body in the enclosure.

Abstract: A cylinder lock is provided with means for preventing a cylinder from being extracted to improve safety against breakage of lock. The preventing means comprises a mouth member which is fixed to the cylinder at an entrance of a keyhole but capable of being broken off from the cylinder and becoming rotatable with respect to the cylinder while being undetachable. Preferably the mouth member has a hardness greater than that of the cylinder.

Abstract: A locking mechanism for fuel lines in vehicles in which at least a part of the unit is constructed of aluminum to resisting flame cutting and hardened steel dowel pins are used to resist saw cutting. The locking mechanism has an internal recess which encloses a fuel line valve in a closed position. The locking mechanism is comprised of two members which are interlocked to one another by a rotatable keying element which is in one member and selectively engages with the other member upon operation of a key to lock the members to one another while the fuel line valve is in a closed position.

Abstract: An L-shaped guard plate for reinforcing a door in the area of the door lock assembly. The L-shape provides a strengthening function without introducing any misalignment in the position of the lock bolt of a door with respect to the strike plate carried in a door frame. The device is thus both effective and easily installed on most doors. The guard plate may include integral tabs which engage slots in the housing of the lock unit. The tabs serve to provide increased resistance to the application of rotational forces to the lock unit.

Abstract: A protection device of the type useful for preventing access to a padlock or small combination lock as well as serving as a container for keys, incorporates a first and second half which are joined together along a junction to form a united body. The united body has a closed bottom wall and a substantially circular circumferential wall as well as a top wall. Locking means are adapted to the body to secure the first and second halves together. The top wall includes an essentially elongated opening formed partly in one of the halves and formed in the remainder in the other half. The opening is sized and shaped to allow exposure of the shank of a padlock or combination lock from the body while retaining the body of the padlock or combination lock within the hollow interior of the united body as well as retaining a bulbus member attached to an exposed U-shaped member.

Abstract: A door-locking device is described including a plurality of locking bars drivable to a locking position projecting from the sides of the door into the door frame by means of a rotatable drive gear and a plurality of gear-cam segments, one for each locking bar. Each segment includes gear teeth formed on a first portion of its outer circumference meshing with the teeth of the drive gear, and a cam surface formed on a second portion of its outer circumference engageable by a cam follower carried by its respective locking bar. The locking device further includes a key-operated locking cylinder and an overlying protector plate having an opening covered by a disc formed with the key slot, the disc being yieldingly secured to the protector plate to thereby prevent a drill from penetrating same into the lock cylinder.

Abstract: A tamperproof dead bolt device secured to a door jamb is disclosed including a stationary support plate assembly provided with a slotted section for a sliding dead bolt which in the secured position projects into the plane of the arc for opening the door. The dead bolt device further includes a lock member which prevents the dead bolt from being retracted from the secured position. When the dead bolt device is installed it is secured through the door jamb and wall partition to distribute the forces of an attempted forced entry over a larger surface area.

Abstract: A theft proof lock which includes a protective sleeve rotatively disposed relative to a lock cylinder so that the protective sleeve is free to rotate whenever a torque or turning movement is imparted thereto by one attempting to tamper with the lock to secure against unauthorized access to the lock secured premises and thereby prohibiting such tampering from defeating the lock.

Abstract: A door latch construction has exterior and interior operators connected through a latch driving mechanism operable for extending a bolt from a door edge. The exterior operator includes a lock cylinder telescoped by a thickened, hardened metal guard collar with the guard collar longitudinally inwardly abutting a metal shield retaining the shield inwardly against an exterior face of the door. The shield also extends inwardly of the door interior at least partially annularly around a portion of the latch driving mechanism thereby deterring manipulation of the latch driving mechanism by penetration through the door exterior face. The lock cylinder longitudinally inwardly abuts the guard collar so that the guard collar retained between its lock cylinder abutment and its shield abutment is rotatable to deter exterior attack against the overall exterior operator.

Abstract: A locking assembly for electrical enclosures to prevent unauthorized tampering with internal power connections. The locking assembly comprises an adjustable bracket which is secured to the walls of the enclosure by bolts; a cover which covers the open front and a substantial part of the sides of the enclosure and which is secured by a bolt to the adjustable bracket, a locking shield which overlies and prevents removal of the bolt which attaches the cover to the adjustable bracket, and a removable lock bolt which secures the shield to the cover.

Abstract: A bolt assembly used for locking and unlocking a door-leaf, which comprises a bolt movable from the outside by a key introduced into the barrel of a safety cylinder, the housing of the barrel comprising a flange which can be immobilized in rotation and translation by three plates fixed to the outer surface of the door by bolt means, a fourth plate covering said bolt means. This plate is treated against drilling, and the last three plates are soldered to each other and lodged in a housing.By loosening the bolt means and removing the first plate, the safety cylinder can be replaced.

Abstract: A cylinder lock has a lock body with a cylindrical throughbore and two longitudinally extending grooves in its internal surface. A lock cylinder is mounted in the throughbore for rotation therein between a locking position and an unlocking position and has a longitudinally extending key passage and is responsive to the insertion of a suitable magnetic key in the key passage to enable rotation thereby from a locking to an unlocking position. A plurality of magnetic bodies are mounted on both sides of the key passage for rotation about an axis perpendicular to the longitudinal axis of the cylinder to a unique angular position when the suitable key is inserted with corresponding recesses which are longitudinally aligned in two lines when the magnetic bodies are in their unique position.

Abstract: A cylinder (10) which is highly pick-resistant and also highly resistant to other means of forced entry is provided. The cylinder is of a unique hemispherical construction, involving a hemispherical shell (12), hemispherical plug (13) and hemispherical plug insert (14). In a preferred embodiment, the keyway (28) includes two keyways (23, 25). The key is of a correspondingly complex configuration including a generally circular handle portion (28) and two generally semicircular tumbler pin actuating portions (36 and 37). The hemispherical configuration and the multiplicity of keyways renders it particularly difficult to pick the lock.

Abstract: A security shield for protection of the shackle of a padlock makes use of a sheet of metal of relatively heavy gage which has one portion bent to a position where it overlies one side of the shackle when the shackle is in locked position on the body of the padlock making it difficult for an unauthorized person with an appropriate rod cutter or chisel to cut through the shackle and release the padlock. The shield is attached to the padlock itself, either permanently or temporarily, by use of a second portion of the sheet of metal bent to a suitable position where it is attached to and carried by the body of the padlock.

Abstract: A latch and cylinder guard which can be bolted through a door without interfering with the latch and providing a double layer of metal in the latch vicinity.

Abstract: A steering lock for motor vehicles which consists of a lock cylinder, of a housing and of a cover sleeve of tough material at least partially surrounding the housing, which is adjoined by a cap arranged within the area of the end face of the lock cylinder and which is provided with a recess along the inner wall, into which engages a safety catch against unauthorized removal of the cover sleeve; for the disassembly of the lock cylinder, the safety catch can be disengaged in a predetermined position of the key and therewith of the rotor of the lock cylinder; the cover sleeve is fastened to the housing by a threaded connection secured against an unscrewing and surrounds with play by means of a radially inwardly directed rim, a thick-walled cap retained at the front face of the rotor; the cap in turn is provided only with a closely fitting opening for the insertion of the key.

Abstract: A rotatable lock plug having a key slot formed entirely axially therethrough has a barrier secured in the lock plug adjacent the key slot inner end between an inner end of a key received in the key slot and a torque blade operably connected to the lock plug inner end for providing a barrier denying surreptitious access through the key slot. The barrier has edge portions received in appropriate lock plug recesses and preferably a flat portion transversely spanning the key slot. In one form, the barrier may be an axially slotted pin receiving the key end within the slot, and in other forms may be edge secured, flat plates.

Abstract: A security device for an automobile trunk having a cylinder lock mounted within an opening in the trunk lid with a lock stem extending inwardly from the lid into a keyway of a trunk latch housing. The security device comprises a block defining a central aperture mounted snuggly about the cylinder lock overlaying the inside surface of the trunk lid about the trunk opening. A resilient mounting plate is mounted to the block and to the trunk lid. The block serves to inhibit prying of the lock outwardly from the trunk lid to expose and gain access to the trunk latch housing keyway through the trunk lid opening while the resilient mounting plate prevents the cylinder lock from falling and exposing the trunk latch housing keyway should the lock be pried inwardly.

Abstract: A padlock presents a straight shackle axially slidable in seats provided in two wings obtained in the padlock body, so as to be capable of closing a U-shaped recess defined by the said wings. The shackle is locked in its closure position by a latch pin the movement of which is controlled by the rotation of a cylinder of a cylinder lock of known type, housed in the padlock body. An armour jacket made of steel is vested onto the side surface of the padlock body, thus conferring to the padlock a protection against attempts of breaking open. The said armour jacket also serves for closing the bores for the pin tumblers and the bore for housing the latch pin, and of any other bore made in the side surface of the padlock body for housing the components of the padlock mechanism.