Abstract: The magnetic anti-tampering system of the magnetically enhanced key and lock system provides a mechanical and magnetic security system. It utilizes a modified paracentric key and a locking assembly affixed to a component inside of a paracentric lock. The magnetically enhanced key and lock system increases the security of a pair centric lock by defeating the unauthorized operation of pair centric locks by unauthorized users, such as inmates, who have fabricated copies of the authentic, paracentric keys. Paracentric locks and keys are the most common type of locks used in jails, state prisons, and detention facilities. The locking system requires that both the teeth of the key and the magnetic pairs of the key and locking dog combine to open the lock.

Abstract: A dual key bi-step lock having a shell and a cylindrical plug in the shell. The plug has a primary keyway and a secondary keyway and at least one set of primary pin stack and at least one set of secondary pin stack between the shell and the plug, respectively coupling with the primary and the secondary keys. a longitudinal stage is formed on a cylindrical surface of the plug. An involute side face extending from the stage to the cylindrical surface of the plug. The primary key is able to dive the plug to a position of first step open at which the stage is stopped by the key pin of the secondary pin stack. The secondary pin stack is unlocked by the secondary key and the plug is able to be further driven to a position of second step open by the primary and the secondary keys from the first step open.

Abstract: A lock core includes a rotation mechanism and a clutch mechanism for separating the unlocking and opening processes of locks and prevents the lock from being unlocked destructively. The rotation mechanism comprises a plug and a plug sleeve. The clutch mechanism comprises a group of discs and a sidebar. The rotation mechanism is triggered by the clutch mechanism. Therefore the primary key for the clutch mechanism locks/unlocks the rotation mechanism. A secondary key is introduced for turning the rotation mechanism to open the lock core. The primary key and the secondary key are combined by another mechanism comprises two slots, two rivets and a spring.

Abstract: A method and apparatus for extending an existing simplex or multiplex lock-and-key system that includes a family of first keys each having a first profile and of a corresponding plurality of first locks each operable by a first key and each having a first keyway configured for accepting the first key profile. Second keys of a new family are defined with a core section corresponding to the first key profile and a narrowed projection extending from the bottom of the core section. Corresponding second locks have a second keyway profile defined as the compliment of the second key profile, thus including a complimentary core section and a foot recess extending from the bottom of the second keyway core section. The second locks accept a second key positioned at the second keyway baseline to normally lift the lock pin stacks and operate the second lock.

Abstract: A method and apparatus for extending an existing simplex or multiplex lock-and-key system that includes a family of first keys each having a first profile and of a corresponding plurality of first locks each operable by a first key and each having a first keyway configured for accepting the first key profile. Second keys of a new family are defined with a core section corresponding to the first key profile and a narrowed projection extending from the bottom of the core section. Corresponding second locks have a second keyway profile defined as the compliment of the second key profile, thus including a complimentary core section and a foot recess extending from the bottom of the second keyway core section. The second locks accept a second key positioned at the second keyway baseline to normally lift the lock pin stacks and operate the second lock.

Abstract: A locking device, which mounts a user key (the first key) and a manager key (the second key) separatedly, places a first lock and a second lock unitedly in an outer cylinder. The first lock is opened or rotated by the first key. After the first lock is open, the first key cannot be pulled out of the locking device. If the second lock is open by the second key, the first key can be pulled out together with the second key.

Abstract: A safety deposit box lock assembly has a housing and latch bolt carried by the housing. The latch bolt is movable between a locked and an unlocked position relative to the housing. A guard lock is provided as part of the lock assembly and is movable by a guard key between an unsecured orientation and a secured orientation. The guard lock permits movement of the latch bolt to the unlocked position when the guard lock is in the unsecured orientation. The guard lock prohibits movement of the latch bolt to the unlocked position when the guard lock is in the secured orientation. A patron lock is provided as part of the lock assembly and is movable by a patron key between a latched orientation and an unlatched orientation. The latch bolt is in the locked position when the patron lock is in the latched orientation. The latch bolt is in the unlocked position when the patron lock is in the unlatched orientation.

Abstract: The present invention relates to an electronic lock having first and second disposed in axial alignment is provided. A first key inserted into the cylinders of the electronic lock sends an electronic signal to a solenoid which retracts a stopper from engagement with a latch plate upon turning the first key through an initial angle. Thereafter, the first key drives the first cylinder to drive a first cam which moves against a first cam follower to move the latch plate and withdraw the latch from locking engagement. In the event of an electronics failure and/or in order to manually override the electronics, a second key is inserted into the axially aligned cylinders. The second key initially drives the second cylinder to move a second cam against a second cam follower that bears against the stopper to remove the stopper from engagement with the latch plate.

Abstract: A locking device includes a lock body with two blind bores and a shackle with two parallel arms for insertion into the bores. The lock body further includes two key-actuated cylindrical plugs, an accommodation chamber disposed therein proximate to the plugs, and a linkage member provided within the chamber to interlink the plugs in such a manner that only simultaneous actuation of the cylindrical plugs can retract the spring-loaded latch bolts to release the shackle from the blind bores of the lock body.

Abstract: An exit door has a security device comprising a flexible member, e.g. a chain, for connecting two locking devices which may be fixed on a door and doorway or on double doors. The first locking device is operable by a first key removable only when the locking device is activated and a second key removable only when the locking device is deactivated. One end of the flexible member is fixed to the second key and the other end is fixed to the second locking device, which is operable by the second key, being removable from the second locking device only when it is activated, and by a third key removable only when the second locking device is deactivated. The security devices are members of a series of such security devices in which the third key of each security device serves as the first key of the next security device in the series. The last key in the series is essential to operation of a control unit permitting use of a building provided with the exit door.

Abstract: A lock adapted to be used in conjunction with a slidably insertable card comprises a front housing segment and a rear housing segment, a bolt movable along a slide path from a normally open position to a fully locked position, a card housing, a lockout member with a first blocking position and movable to a second release position, a blocking member affixed to the lockout member, and normally disposed in the slide path of the bolt but movable out of the slide path of the bolt. The lockout member also has a peg that engages opening in the card and in the front housing segment constructed and arranged to receive the peg and allow free movement of the bolt into the fully locked position. An improper card or a proper card inserted improperly will not allow the peg to move into the opening, and the blocking member will remain in the slide path of the bolt, preventing the lock from being locked.

Abstract: To prevent the unauthorized unlocking of van doors equipped with safety rod locks, the lever of the safety rod lock is held to the door by a retainer clip. The retainer clip has an extending tongue with apertures in it that passes through the door into the van. In the van, there is a dead bolt which may be actuated by a key cylinder inserted from outside the van through the door to cause the dead bolt to enter an aperture and lock the extending tongue of the retainer and hold the retainer in place so that the lever cannot be moved to unlock the safety rod lock. A second key actuated member or solenoid actuated member is actuated to move a cam in front of the first key slot so that it cannot be unlocked until the second cam lever is moved out of the way. Thus, a sequence must be followed using two different actuating means to unlock the door or lock the door.

Abstract: A condom case is provided that houses one or more condoms within an enclosure having two distinct and interdependent locking mechanisms. Two separate keys must be employed simultaneously to disengage the locking mechanisms and open the condom case. The condom case pragmatically protects the condom while symbolically promoting the concepts of mutual consent, fidelity, dignity, commitment and intimacy. The keys may be worn around the necks of each individual as an overt talisman of their exclusive relationship.

Abstract: A post office locker allows for delivery and safe storage until pickup of packages in one or more storage compartments each fitted with an access door provided with a custodian lock under the sole control of a mailman and an access lock adapted to be operated for access door opening purposes by a key supplied by the mailman to an intended recipient of a package. The access lock features an improved latch device arranged to cooperate with the custodian lock for defining two separate latch positions in which the custodian lock is constrained against rotation towards its door locked position.

Abstract: An adjustable and encodible lock for room doors, safe deposit boxes or the like, under utilization of two separate lock structures includes two separate sets of tumblers possibly arranged vertically one above each other; a main slide coupled to an existing lock cylinder or to the common lock or latch or both, the main slide has two follower pins (13b and 13c); the upper tumbler system may be aligned with a cylinder axis of an existing lock; the lower tumbler system is then axially aligned with a latch handle and a lock disk for locking and unlocking the main slide; two control slides (21, 22) are respectively associated with the separate two lock and tumbler sets and are respectively provided with cutouts (21c, 22c) for engagements with the two follower pins; a first one of the tumbler set is provided for being operated by a customer key, the other one of the sets is provided for operation by a management key; each tumbler of the first set has funnel shaped control cutouts; and an intermediate slide is provid

Abstract: A security box with a door combined with an electricity charged cover, an alarm, an electrical insulator inner cover between the box and charged cover, an electrical insulator outer cover outside of the charged cover, switch means for activating the alarm when the outer cover is traversed and remote switch means for deactivating the charged cover and alarm.

Abstract: A lock mechanism for a rotatable stub such as the operating shaft of a fluid flow control valve has a main body 10 connected to a drive member 12 adapted for mounting on the rotatable stub. A locking sleeve 17 is adapted to fit closely to the machine (e.g. valve) on which the mechanism is fitted so as to be held against rotation, and mounted in the body are two key-operated lock members 25 engageable with the sleeve 17 to lock the body against rotation. Associated with each lock member 25 is a control plate 56, movement of which can be blocked by a stop member 53 so preventing operation of the associated lock member 25. The two stop members 53 are threaded on studs 55 fixed in the body 10, and are moved linearly on being rotated by respective toothed wheels 46, driven by a peg 62 on sleeve 17 as the body 10 is rotated.

Abstract: A double-acting locking device of the axial pin tumbler type for joint control. A rotary plug, a control plug, a master plug and a stationary plug fit in contact with each other within a cylinder. Connections and disconnections between those plugs are effected by the actions of top pins, master pins and bottom pins, all of which fit into axial pin holes formed in those plugs and are spring-biased forward. The selection of the connections and disconnections of the plugs is effected by a first key, a second key, and a master key. The rotational directions and angles of the actuating shaft set by the first and second keys are controlled by the actions of front and rear face projections on the control plug, a rear face recess of the rotary plug, and a front face recess of the master plug.

Abstract: The present invention relates to a lock with a double locking mechanism comprising a first locking mechanism having tumblers movable by a first key to authorize the operation, by means of a second key, of a second locking mechanism comprising a bolt associated with a releasable fingered bolt-retaining member through the medium of a link bar pivotally mounted on the releasable member and pivotally connected by one of its ends to the bolt, whereas the other end of the bar is adapted to co-operate with a retractable stop controlled from a distance.

Abstract: A locking system comprising a housing, first and second lock cylinders each including a disk having an extension, each of the disk being rotated by a suitable key, a thrust bar having notches to receive the extensions and having a locking position for which the extensions are engaged in the notches, the thrust bar being movable when the disks are rotated simultaneously so that the extensions move out of the notches, means to maintain the extensions in the notches when the thurst bar is in its locking position, and means to urge the thrust bar to its locking position.

Abstract: A protection system for preventing unauthorized entry through a door member. An electrically charged cover is placed over the door member for electrically shocking anyone who attempts unauthorized entry therethrough. An electrical insulator inner cover is placed between the door member and the electrically charged cover. A first lock is provided to lock the door member in a closed position. A second lock is provided to lock the first lock in a locked position.

Abstract: A double changeable tumbler lever type key lock for safe deposit boxes and the like having a slidable bolt plate carrying a stack of fence members, and a stack of tumbler levers occupying positions in the locked condition to bar retraction of the fence members and bolt plate from locking position. The tumbler levers each have first and second lift edge portions and are movable responsive to a guard key and a renter's key engageable with the pair of lift edge portions of each tumbler lever to position the levers to permit retraction of the bolt to unlocking position. Mounting structure on the bolt plate supports the fence members of the stack for guided adjustment to positions corresponding to a predetermined range of key shapes and for selectively clamping the fence members in their adjusted position.

Abstract: A lock includes a running plate formed integrally with a locking bar and provided with a fence adapted to cooperate with a plurality of tumblers so as to alternatively block and allow retraction of the locking bar, and this mechanism is mounted together with the cooperating components within a lock housing. The tumblers allow retraction of the locking bar when moved by a prescribed key to a unlocking position and this prescribed key, which can move the tumblers to the unlocking position, can be exchanged with another prescribed key by displacing the rotational axes of the tumblers. The rotational axes of the tumblers are rotatably released or fixed by a conversion shaft extending through an opening formed in the tumblers and rotatably supported in the lock housing. The conversion shaft is provided with a stop piece and a locking piece.

Abstract: A security lock for use on sliding doors or gates has a pair of hook bolts which are thrown apart or withdrawn together according to the position of a head on a reciprocable slide. Each bolt has a recess mated to the head with front and rear driving surfaces, this geometry being related to the pivot points of the bolts such that the head drives the bolts positively between their thrown and withdrawn positions with no lost motion and without the need for spring-biasing of the bolts. The slide is deadlocked by a pack of levers, to which a second lever pack is linked, two lever packs being provided so that non-palindromic key-stepping can be employed. If required, the slide can be double-thrown by successive use of two different correct keys, for which different key-hole positions and are provided to cooperate with the lever packs.

Abstract: Disclosed is a keylock having a key settable lever tumbler which can be bent, by use of an operating key, from an initial neutral configuration to set it to the operating key, and which by use of a change key can be restored to its initial configuration and then reset to other operating keys. The tumbler can be rebent and reset to different keys a substantial number of times. The accuracy of the rebending is assured by imparting an overbend which accommodates the spring back that accompanies the rebending.

Abstract: A changeable safe deposit lock, usable in a single key or a double key configuration, having one or a pair of stacks of vertically slidable adjustable fences carried on a bolt plate and held in adjusted positions by a clamping assembly having a changing screw which is accessible at the back of the lock when the bolt plate is in unlocked position. After insertion of a key for which the lock is presently conditioned and rotation of the key to the unlocked condition, the screw may be loosened and the key rotated an additional distance whereby the initial key can be removed from the lock and a second key may be placed in the lock and rotated to return the bolt plate to the locked position and the changing screw tightened down to lock the fences in the new position adapted to the new key.

Abstract: A duplex lock codable by a master key and releasable by a duplex key and comprising a first fixed hollow cylindrical body in which a second cylindrical body is rotatably mounted. An axially shiftable slider is firmly secured to the second cylindrical body for locking it relative to the first cylindrical body by insertion in a cavity provided at the bottom of the first cylindrical body. When the slider is withdrawn, the two cylindrical bodies are released. The slider is provided with a plurality of axially spaced recesses which by axial movement of the slider can be brought into alignment with a plurality of apertures in the rotatable cylindrical body. Each of the apertures accommodates a U-shaped rocker lever having a front U-shaped end facing the slider and a rear end attached to a helical spring tending to pull the rocker lever toward an abutment surface in the interior of the rotatable cylindrical body.

Abstract: The lock configuration described in the parent application enables a dual key lock to operate efficiently, accurately and conveniently with a single stack of tumblers. Also, the individual tumblers of the invention are typically receivable in the lock in a plurality of alternative orientations in which their gates assume different functions, facilitating key changes. The present application discloses means for further improving the precision of gate positioning in such locks, and remarkably simple and economical means for adapting such locks for either right- or left-hand installation.

Abstract: The lock includes a lock housing mounting a first tubular member. The first tubular member includes a plurality of spring biased pins which are divided into a plurality of sections. An intermediate tube is rotatably received within the first tube and includes a spring biased cam member which has a pin extending through a slot formed in the intermediate tubular member. The pin extends into the first tubular member to inhibit rotation of the intermediate tubular member. An inner tubular member is received in the intermediate tubular member and includes a keyway formed therein. A first key is received into the keyway and coacts with the first segments of each of the pins to enable rotation of the inner tubular member thereby moving the cam surface forwardly and rotating the pin to a second position. Thereafter, a second key is placed in the keyway. The second key coacts with certain segments of each pin to allow rotation of the intermediate tubular member which also carries a pair of shackle releasers.

Abstract: The invention provides an improved lock configuration by which a dual key lock can operate efficiently and conveniently with a single stack of tumblers. That configuration permits more accurate positioning of the tumblers upon key operation, whereby a larger number of key combinations can generally be accommodated. Also, the individual tumblers of the invention are typically receivable in the lock in a plurality of alternative orientations in which their gates assume different functions. That difference of function may constitute a change of effective gate position with respect to the same key, or may shift cooperation with the two keys from one pair of gates to another. That aspect of the invention is useful in facilitating key changes, especially in locks designed for safe deposit and similar service.

Abstract: A padlock has a body having a central portion and two axial end portions. Two drums are rotatable received in two axial holes in the end portions and have engaging members and through-going holes. A shackle is insertable and withdrawable from transverse holes of the end portions of the body. The central portion of the body has through-going holes arranged to coincide with the through-going holes of the drums in respective circumferential positions of the latter. The springs are accommodated in the through-going holes of the central portion of the body. Inner pins are located axially outwardly of the springs at both sides thereof. Outer pins are located axially outwardly of the inner pins. The outer pins insertable in the through-going holes of the different drums have differing lengths. Two keys having projections of differing length are provided.

Abstract: The invention relates to an improved device for opening a lock and a means for actuating the device. The device is characterized by a moving plunger or rotating wheel which is provided with slots which mesh with at least two rocking tumblers which engage the slots when they are biased by a reference card and thus prevent movement of the plunger or wheel. The rocking components can be disengaged from the slots when they in turn are biased by the proper keycard, thereby freeing the plunger or wheel and allowing operation of the mechanism of the lock.

Abstract: A double key changeable safety deposit lock includes a movable bolt and associated bolt plate including cam surfaces to be engaged and moved between open and closed positions by turning renter and guard keys in the lock, a plurality of gated tumbler renter key levers to be engaged by the renter key, a plurality of gated tumbler guard key levers to be engaged by the guard key, each of the levers being moved to align their respective gates to receive latch members on the bolt plate upon manipulation of the two keys to allow opening of the lock and wherein pivot means are provided for each lever including a plurality of individually selectable pivots such that the pivotal axis of each lever may be selectively varied to provide for different combinations of lever movement required by an associated key to align the associated gates.

Abstract: A changeable combination key lock for safe deposit boxes and the like, wherein a guard key is insertable into a rotatable guard key plug to set guard key tumblers to permit retracting movement of a bolt, and a renter's key is insertable into a rotatable renter's key plug for engagement with renter's key tumblers to aline them to permit retraction of the bolt. Both the renter's key tumblers and the guard key tumblers are releasable from gate members carried by the bolt and may be set for key configuration for a new renter's key and a new guard key, or either of them, when the lock is conditioned in a change mode to permit adjustment of the lock to operate with different guard keys and renter's keys.

Abstract: A lock construction for a safe deposit box requires two keys for operation of the bolt. The first key is provided by the vault guard and the second key is provided by the customer. Each key activates a separate set of wafer-like tumblers by rotating the tumblers in response to rotation of the key. Each set of tumblers includes a plurality of key engaging drive tumblers which are gear engaged with gate tumblers. Appropriate rotation of the keys orients a notch of the gate tumblers that permits withdrawal of the bolt. Stops are provided on the bolt cooperative with key operated shifters to insure sequential operation of the keys. A change key tool may be inserted from the back side of the lock to disengage the drive and gate tumblers. Subsequent to disengagement of the tumblers, it is possible to substitute one or both of the keys and thus change the relative gear engagement of the tumblers.

Abstract: A cylinder and plug type lock mechanism drivingly connects an authorized key to the actuator of a switch device and captivates the key when turning the switch on. A magnetic latch activated in the captive position of the key, prevents return of the key to its release position. A magnetic release element is positioned on the key against the lock mechanism to disengage the magnetic latch.