Abstract: A cylinder lock with a resiliently biased auxiliary locking pin, the auxiliary locking pin having a first end which functions as a tenon and a second end which defines a cam follower. The first end of the auxiliary locking pin extends into the keyway and is engaged by a cooperating key blade having a longitudinal slot which defines a mortise. The second end of the auxiliary locking pin normally engages a recess in the inner diameter of the lock shell, a camming surface being provided at one side of the recess. The depth profile of the mortise increases from an initial tenon receiving depth, at the blade tip, to a functional depth, at a point displaced from the blade tip, where the locking pin is partially withdrawn from the shell recess to enable rotation of the lock core relative to the shell.

Abstract: A novel lock system utilizes a cylinder lock and a companion key with a projection extending from one side thereof to improve security. The cylinder lock comprises a shell, a core which is rotatably mounted within the shell and a plurality of pin tumbler stacks normally prevent movement between the shell member and the core. Shear lines are defined between the shell and the core, and also within each tumbler stack. The core also includes an outer surface, a longitudinal keyway and a cut-out which is normally offset from, but alignable with, at least one of the tumbler stacks. A plate member is disposed within the cut-out for movement between a first position, wherein the plate member acts as an extension of the core surface to prevent a tumbler stack from entering the cut-out and a second position, wherein the plate member does not prevent a tumbler stack from entering the cut-out.

Abstract: A cylinder lock is provided with a resiliently biased auxiliary locking pin which projects into the keyway, the auxiliary locking pin having a first end which is shaped to in part define a flaring tenon and a second end which engages a locking recess in the lock shell. The cooperating key has a blade with a longitudinal slot shaped, in the manner of a mortise, to engage the first end of the auxiliary locking pin, the depth profile of the mortise increasing from an initial engagement depth to a functional depth. Key insertion causes generation of an axial force which is applied to the head of the auxiliary locking pin to retract the pin second end from the shell locking recess.

Abstract: A cylinder lock and key combination, where the key (20) has an undercut profile groove (24) at one side surface (22) thereof and, in the key slot (13), the lock key plug has a corresponding profile tongue (15) with a downwardly projecting end portion (15a), which fills up the undercut portion (29) of the key profile groove (24) upon insertion of the key into the lock.

Abstract: A lock has a rotatable member (24), a latch member (22) operatively connected to the rotatable member for movement between locked and unlocked positions when the rotatable member is turned, a key stop (38) having an end facing toward an exposed end of a casing (10) that defines, together with the end of the rotatable member facing toward the exposed end of the casing a dead-end wall. Key stop (38)is mounted for axial reciprocation in, and for combined rotation with rotatable member (24) and has in the end facing toward the exposed end at least one code socket (46, 48) offset with respect to the axis of rotation of the rotatable member. The lock also has a rotatable spring-loaded block (54) mounted between the exposed end of the casing and the end of the key stop. The block is held in the casing against axial movement and has a substantially diametrical key slot (72) angularly offset with respect to the code socket. The key stop is axially pressed against the rotatable block by a spring (42).

Abstract: A motor vehicle door lock or the like comprises a locking mechanism for securing and releasing the door, operated by a lock which is disengageable from the locking mechanism. The disengageable lock comprises a stator, a tubular intermediate sleeve, a rotor operable by a key, and a control lever for actuating the locking mechanism. The control lever is coupled to the rotor through a driving sleeve. The lock also includes an indexer which is moveable axially between a rest, or engaged, position and a disengaged position when the intermediate sleeve is rotated during actuation of the rotor by an incorrect key. This axial movement of the indexer displaces the driving member axially to a position in which the driving member is prevented from rotating. The indexer is fixed in rotation to the intermediate sleeve, and is also free to rotate with respect to the stator when in the disengaged position.

Abstract: A cylinder lock and key combination, where the key (20) has an undercut profile groove (24) at one side surface (22) thereof and, in the key slot (13), the lock key plug has a corresponding profile tongue (15) with a downwardly projecting end portion (15a), which fills up the undercut portion (29) of the key profile groove (24) upon insertion of the key into the lock.

Abstract: A sidebar ignition lock is provided with improved anti-tampering features. The ignition lock includes a cylinder extending along a longitudinal axis and rotatably supported within a sleeve. The tumblers are maintained entirely within the diameter of the cylinder to prevent possible picking of the lock. A knob is provided to prevent access to the area between the outer surface of the cylinder and the inner surface of the sleeve. When the cylinder is received within the sleeve, the knob is maintained on the cylinder head by a retaining member extending from the sleeve. The sidebar ignition lock further includes a roller ball detent to prevent over rotation of the cylinder with respect to the sleeve.

Abstract: A lock assembly includes a lock and a flexible key. The lock includes a lock and an elongated plug unit having a longitudinal curved keyway that is accessible by the key. The keyway has several turns and several branch slots, each of which extends from one of the turns of the curved keyway in a direction different from that of a portion of the curved keyway succeeding the turn so as to mislead an undesirable flexible stick into the slot.

Abstract: A cylinder lock and an associated key include a rotatable cylinder key plug having a key slot into which the key is insertable. The key has a lower solid base portion with coded side recesses for engagement with side tumblers of the lock. From the solid base portion, a lip projects upwardly at a transversal distance from the rest of the key blade, and the side recesses extend partially through the lip and partially through the solid base portion. The key slot has a corresponding cross-sectional profile with a downwardly projecting tongue.

Abstract: The invention relates to an improvement in a key-actuated pin tumbler lock of the type having: a cylindrical core rotatable in a lock housing via a rotational path, a plurality of pin tumblers received in bores journalled in the core and lock housing, each bore containing a set of pin tumblers comprising one core pin and one housing pin, biassed towards the core, and having a pin junction therebetween, and a key slot in the core, whereby insertion in the key slot of a key having thereon suitable bits is adapted to align the pin junctions with the rotational path of the core in the lock housing, and to permit the core to rotate within the housing.

Abstract: An improved security cylinder lock and key for operating the cylinder lock are disclosed. The cylinder lock has conventional tumbler locking structure and a secondary locking bar that operates independently of the tumblers. The secondary locking bar prevents operation of the cylinder lock until a properly configured key is placed in the keyway of the cylinder lock.

Abstract: An essentially pickproof padlock has a housing defining an interior chamber and a keyway with a stacked parallel arrangement of multiple annular cam rings fixed concentrically within the housing. The radially inward annular surface of each cam ring is formed with a respective raceway of a predetermined annular extent and disposition relative to the chamber. A tumbler assembly is disposed within the cam arrangement for selective relative rotational movement. The tumbler assembly has a plurality of slidable pins each with a head portion forming a bearing element. An associated key is formed with a plurality of parallel axial recesses for receiving the pins of the tumbler assembly, each recess being of a selected respective length terminating at a shoulder to collectively engage and move the head portions of the pins into respective operative dispositions within corresponding ones of the raceways wherein the tumbler assembly may be rotated by the key between locked and unlocked dispositions.

Abstract: A lock for the ignition circuit for an automobile including a Hall effect control sensor which is activated by a control magnet on the cylinder member of the lock so that when the cylinder is rotated by the key to its start position, the control sensor is activated. The activation of the control sensor provides one of several starting criteria to an ignition for starting an automobile. An anti-tampering sensor spaced from and adjacent to the control sensor has a trip level which is lower than the trip level of the control sensor so that magnetic forces induced from the exterior of the lock cannot trip the control sensor. A blocking plate is disposed between the control sensor and the anti-tampering sensor to prevent the anti-tampering sensor from being tripped by the control magnet when the cylinder member is rotated to its start position and to enable the anti-tampering sensor to be tripped first to produce a deactivation signal in response to a magnetic force induced from the exterior of the lock.

Abstract: An axial pin tumbler lock comprises a housing, an outer tumbler pin seat, a plurality of outer tumbler pins, an inner tumbler pin seat, and a plurality of inner tumbler pins. The smallest distance between the center of the outer tumbler pin seat and the outer edge of at least one of the outer tumbler pins is greater than the radius of the first axial hole of the housing, so as to enable the outer tumbler pin in question to be concealed by a shoulder located between the first axial hole and the second axial hole of the housing.

Abstract: A directional control and time delay interlock for making a key operable rotatable tumbler lock substantially pick-proof. When the proper key is inserted the core of the lock is rotatable in a first direction for elevating a biased pawl from locking engagement with a cam surface carried by the rotatable portion of the lock. The distal end of a pawl engaging an indentation in the rotatable portion of the lock prevents initial rotation of the rotatable portion of the lock in a second direction opposite to the first direction of rotation. After rotation in the first direction of rotation, the distal end of the pawl is elevated away from the rotational portion of the lock freeing its engagement with the rotatable portion of the lock. With the pawl elevated, the rotational portion of the lock can be quickly rotated in the second direction past the pawl before the distal end of the pawl returns under a slight bias to the surface of the rotatable portion of the lock.

Abstract: A key operated rotatable plug and cylinder define pin-receiving holes arranged in first, second and third rows that extend in first, second and third planes, respectively that radiate from a common center axis that extends substantially centrally through a plug-defined keyway. A key of generally rectangular cross-section is insertable into the keyway to bring recesses that are formed in its two relatively flat side surfaces and in one of its narrow edge surfaces into alignment with the pin-receiving holes so that inner ends of tumbler pins that are carried within the holes are received in the key-defined recesses to position the tumbler pins to permit plug rotation relative to the cylinder. The first plane extends from the center axis through the holes of the first row, and parallels the opposed, relatively flat side surfaces of a keyway-inserted key.

Abstract: A lock assembly includes a lock shell, at least first and second key plugs, at least first and second tumbler means, and a key for operating the first and second tumbler means. The lock shell has a front end, a rear end, and an accommodation hole extending from the front end to the rear end. The first and second key plugs are aligned axially and are mounted rotatably within the accommodation hole of the lock shell. The first and second key plugs respectively have first and second key ways. The first and second tumbler means are used for positioning respectively the first and second key plugs against the lock shell when the lock assembly is in a locked position. The key can operate the first and second tumbler means so as to rotate the first and second key plugs simultaneously.

Abstract: An axial pin tumbler lock for housing in an outer shell. The lock includes a shell and a rotatable driver sleeve telescoped into the shell. The driver sleeve has a bird-cage design including a front large inner diameter portion and a rear small-diameter inner portion and circumferentially arranged throughbores in communication with the inner diameters. A stationary tumbler sleeve is also telescoped in the shell, and in a facing relationship with the driver sleeve. The tumbler sleeve slot includes throughbores in communication with an inner diameter. A spindle extends through the sleeves and is rotatably mounted in the driver sleeve. The spindle includes a body portion and a neck portion with a curved transition zone between the two. Driver and tumbler pins mounted in the throughbores normally prevent rotation of the spindle and driver sleeve with respect to the tumbler sleeve.

Abstract: A disk detent cylinder lock comprising a stationary outer cylinder (1); an inner cylinder (2) which has been disposed within the outer cylinder; and a plurality of detent disks (3.sup.1, 3.sup.2, 3.sup.3, . . . ) which have been disposed to form a disk stack (4) within the inner cylinder to be turnable with the proper key of the lock from their locking positions into opening positions. The lock comprises locking members for preventing lock-picking in a lock-picking situation.

Abstract: A pin-tumbler lock and method of use thereof has an inside cylinder and conventional outside cylinder. The inside cylinder operates with a pin-tumbler key but cannot be operated by the key that operates the outside cylinder. The pin-tumbler key is retained automatically in the inside cylinder once inserted but can be manually released by using an appropriate tool. The inside cylinder retains the pin-tumbler key because the pins become misaligned when the pin-tumbler key is inserted. Previous locks can be a fire hazard or can be burglarized too easily.

Abstract: An improved cylindrical lock comprising a housing, a lower pin seat mounted on the housing, a spindle, a plurality of springs, and plural sets of upper and lower pins. The spindle is constructed by a cylinder and an upper pin seat which is annular and circumferently provided with a plurality of holes. The upper portion of the upper pin seat is provided with an annular wall having a slit for accommodating the outward protruding wing of a key. The inner portion of the wall is provided with a plurality of semicircular grooves diametrically opposing the holes in the upper pin seat, so that one end of each semicircular groove communicates with the corresponding hole in order to form a longitudinal circular hole for receiving a set of springs and cylindrical pins and the other end of each semicircular groove is formed as a groove wall which can prevent the pins from being popped out. Thus, the cylindrical pins can only move between the semicircular grooves and the holes.

Abstract: A mechanical anti-theft device of the type applied to the steering wheel of an automotive vehicle which automatically ratchets to it's applied position without necessity of key lock actuation is provided with several security enhancing features which cumulatively prevent or make the device exceedingly difficult to unlock using conventional burglary tools or lock picking techniques. The features include configuring the ratchet teeth of the telescoping rod member in a way which minimizes any attempt to deactivate the lock unless the key is used. In combination with the ratchet teeth configuration, the lock pawl mechanism is configured to include an arcuate, transversely extending apex edge line or surface which cooperates with or is sized to be coincident with the rod members circumference to prevent a wedge, shim or pick from being readily easily inserted between pawl and ratchet tooth to force a retraction of the pawl.

Abstract: An improved alarm system having a first electrode carried by at least one of the locking elements and a second electrode carried by the locking surface normally engageable by the locking elements when the locking mechanism is in its locked configuration, and an alarm system including an alarm signal generator and a plurality of event detection sensors, one of which is formed by the first and second locking elements, the sensors being coupled to the signal generator such that an event detected by any sensor causes the generator to develop an alarm signal.

Abstract: A cylinder lock comprising a lock body (1) and inside it a rotatable lock cylinder (2) enclosing a number of locking discs (4;6) turnable by the key (3) of the lock and provided with a peripheral notch (8) determining the combination of the lock, and a locking bar (7), which in the locking position prevents turning of the lock cylinder (2) with regard to the lock body (1). The locking discs (4) are also provided with a set of second peripheral notches (10) arranged in cooperation with an auxiliary bar (11) so as to prevent turning of the locking discs (4;6) relatively to each other at the end phase of the turning movement for opening the lock before the locking bar (7) moves into its position for releasing the lock. The second peripheral notches (10) are located outside of the cutting range for said combination peripheral notches (8) and are arranged side by side on the peripheral edge of each of the locking discs (4).

Abstract: In a cylinder lock, half tumblers are slidably arranged in pairs in the tumbler inserting holes formed in the key rotor in such a manner that, when the key is not inserted into the lock, the half tumblers are elastically urged in one direction to cause their engaging end portions to engage with the locking engagement grooves formed in the cylinder body to inhibit the rotation of the key rotor. When the key is inserted into the lock, the key engaging portions of the half tumblers engage the key crests to move the half tumblers to disengage their engaging end portions from the locking engagement grooves. When, instead of the key, a picking tool is used to disengage one of each pair of half tumblers from the locking engagement groove to thereby allow the key rotor to turn through a predetermined angle, the other half tumbler is engaged with the locking engagement groove deeper than usual, and the protruded portion of the key rotor covers the key engaging portion, thereby preventing the picking of the lock.

Abstract: A pickproof lock assembly has two lock sections which can be opened by a single key. The first lock section includes a key plug and a first set of tumbler members which engage radial pits provided on the key so as to disengage the key plug from the lock shell. The second lock section includes first and second movable plug halves disposed inside the lock shell and a second set of tumbler members. The key has axially extending curve protrusions on one end to move the first and second plug halves and align groove-free spaces on the surface of the first and second plug halves to form a continuous annular path. The second set of tumbler members contacts the first and second plug halves at the annular path to permit rotation of the key plug relative to the lock shell.

Abstract: A lock including a sleeve fixed in the body and having a number of orifices, a stud and a spring received in each of the orifices, a barrel received in the sleeve and including a number of apertures and a bore for rotatably receiving a core which includes a notch, and a key engageable with the notch of the core and including a number of depressions, the barrel can not be rotated when the studs are engaged between the sleeve and the barrel, and the barrel can be rotated when the studs are biased to engage within the apertures of the barrel.

Abstract: A cylinder lock has a cylinder lock holder with a rotor rotatably disposed therein. The rotor has a plurality of grooves, with a plurality of tumblers slidably disposed in the grooves. Holder grooves are provided in the cylinder lock holder for receiving the tumblers projecting out of the grooves of the rotor. The rotor is able to be rotated in the cylinder lock holder in response to the insertion of a key into the rotor by causing the tumblers to be retracted from the holder grooves. Rotation is disabled when the key is removed, the tumblers projecting back into the holder grooves under the action of a spring biasing the tumblers. The key is inserted through a plurality of key insertion holes in the tumblers. Tooth portions are formed at respective contact portions between the tumblers and the inner surface of the cylinder lock holder, the respective tooth portions being engaged with each other when the key is removed from the lock.

Abstract: A lock assembly has a lock body and a flexible key. The lock body includes at least two plug pieces having confronting faces with longitudinal curved grooves. The plug pieces cooperatively form a cylindrical plug. The curved grooves are complementary so as to form a longitudinal curved keyway with a cross-section that is shaped to have an upright first portion and a cross-wise second portion. A first set of tumbler members is provided on the cylindrical plug and extends in the direction of the upright first portion. A second set of tumbler members is provided on the cylindrical plug and extends in the direction of the cross-wise second portion. The flexible key is adapted to be received in the curved keyway and is useful for actuating the tumbler members. The flexible key includes a chain of successively hinged knuckles.

Abstract: A cylinder lock is provided which comprises a cylindrical housing; a core which is rotatably mounted in the housing, thereby defining a shear line; a first tumbler slidably disposed in a first aperture; means for moving the first tumbler between a locked and an unlocked position; a second tumbler slidably disposed in a second aperture; and means for moving the second tumbler between a locked and an unlocked position. When the lock is in the locked position, the first tumbler extends across the shear line into the first aperture of the core. When a correct key is inserted into the keyway, the first tumbler is urged completely into the core below the shear line. The second tumbler is arranged such that when the lock is in the locked position, the second tumbler extends across the shear line and such that when the correct key is inserted, the second tumbler is urged completely into the housing above the shear line.

Abstract: A locking mechanism is provided for locking and unlocking a vehicle door latch mechanism. The locking mechanism includes a housing (17) for securing to the vehicle, a barrel (1) rotatable within the housing, a drive (7, 37) selectively engageable between the barrel and the door latch mechanism and means (23) to disengage the drive, wherein the barrel (1) has an unlocked and a locked mode such that rotational movement of the barrel in the unlocked mode is communicated to the door latch mechanism via the drive (7, 37), while rotation of the barrel in the locked mode operates the disengaging means (23) to disengage the drive.

Abstract: A rotary type cylinder lock, a lock and key blade combination system and a locking tumbler are disclosed. The lock includes a row of locking tumblers (15a, 15b, 15c) being non-rotatably guided for elevational movement so as to cooperate with a side bar (19) for releasing the lock. The locking tumblers are provided with fingers (18a, 18b, 18c) located in specific positions, so that the free end portions (24a, 24b, 24c) of the fingers, which make contact with a wave-like code pattern of a key blade, form a specific, irregular longitudinal distribution pattern being different from the longitudinal distribution of the tumbler body parts.

Abstract: A flat key pick resistant cylindrical lock structure which comprises a plug, a sleeve and a housing. The housing is bored off center to receive the sleeve and thus make room for biased split pin tumblers embodying false segments and further, limited misleading internal rotational movement occurs when an attempt is made to pick the lock. Also two shear lines between the plug and sleeve and between the sleeve and housing must be cleared before an unlocking of the lock can be accomplished.

Abstract: The cylinder lock comprises a plug and auxiliary pins which are disposed in seats, provided on the plugs and arranged laterally to the channel of introduction of the key. On introducing the key into the lock the pins are displaced from their seats such that, when the key is not the right one, they will engage into recesses on the outer casing of the lock, thus inhibiting rotation of the plug. By intervening on the pins it is also possible to obtain a set of hierarchically different locks for fabricating master key systems.

Abstract: A tumbler pin lock system comprises a lock mechanism and a key. The lock mechanism has an outer tubular casing mounted to a frame of a computer or similar electrical device. The tubular casing has an central through hole for rotatably receiving a locking spindle. The locking spindle includes a driver pin sleeve having a set of bore holes, each for receiving a driver pin. A rotating shaft protrudes from a first side of the driver pin sleeve, and a protrusion with a keyway slot protrudes from a second side of the driver pin sleeve. A tumbler sleeve is provided on the rotating shaft and is fixed to the tubular casing. The tumbler sleeve has a distributed annular set of blind holes, each for receiving a tumbler spring and a tumbler pin, which are alignable with the bore holes in the driver pin sleeve. A shielding ring having an eccentric flange is received in a key-end of the tubular casing to shield some of the driver pins.

Abstract: An improved, highly pick-resistant axial pin tumbler lock construction incorporating a composite tumbler sleeve assembly made up of at least two limitedly rotatable or floating plates and the stationary tumbler sleeve portion which by virtue of providing a potential rotation as much as 1/2 the arcuate distance between pin bore centers of the floating plates provides false shear planes that preclude tight and loose feels when manipulating driver pins in an attempted picking operation. In the preferred embodiment at least one pin column has at least three pin segments and the floating plates are incorporated with the construction of Johnson U.S. Pat. No. 4,802,354 to provide the highest degree of pick resistance.

Abstract: A cylinder lock system employing a key having a projection extending from each opposing parallel edge of the key blade, the projections respectively operating an auxiliary pin tumbler stack and cooperating with a groove in the lock shell to retain the key in the lock after plug rotation from the key insertion position. The key retaining projection also cooperates with the driver pin of the auxiliary pin tumbler stack to prevent key trapping, i.e., the presence and size of the retaining projections keeps the auxiliary driver pin from engaging the keyway. The cooperation between the key retaining projection and the auxiliary driver pin is permitted by providing the lock with two shear lines, located on different diameters, which are simultaneously operable by a single key.

Abstract: A pick-resistant lock having a housing and a keyway cylinder rotatably mounted within the housing includes a plurality of tumblers and a lock bar associated with the cylinder to render picking of the lock difficult by conventional techniques. The housing has a cylinder-accepting bore provided with a pair of locking grooves arranged so as to face one another. The tumblers and lock bar are movable into and out of locking relationship with a corresponding one of the locking grooves and along parallel paths when the cylinder is positioned in a lock mode position. Springs mounted within the cylinder urge the lock bar and tumblers against one another and toward positions out of the locking grooves while maintaining the lock bar in a locked relationship within its corresponding locking groove so that the cylinder is prevented from rotating.

Abstract: An improved cylinder lock in which at least one tumber assembly includes a pin tumbler supported for rotational movement about its axis within a tumblerway, a driver, and a coupling mechanism releaseably coupling the driver to the pin tumbler for rotational movement of the driver about its axis in response to said rotational movement of the pin tumbler. The coupling mechanism at least partially defines a split line along which the pin tumbler and the driver may separate when the one tumbler assembly is axially and rotationally positioned relative to a plug and a shell in a predetermined releasing position wherein the split line is aligned with a shear line between the plug and the cylinder, and the pin tumbler has means for positioning the one pin tumbler assembly in the releasing position in response to engagement with a proper key in a keyway through the plug.

Abstract: An axial split-pin tumbler lock having a rotatable operating element and a fixed element configured to define a shear plane therebetween, and wherein aligned bores extend in the two elements on opposite sides of the shear plane, with specially configured code pins and drive pins slidable in the bores in the elements across the shear plane, the specially configured code and drive pins being so constructed that they will bind or hang up in the respective bores in any number of axial positions during an attempt to pick the lock, thereby giving multiple and differing false readings of an unlocked condition of the lock and rendering it pick resistant.

Abstract: This specification describes an improved lock of the type described in my U.S. Pat. No. 4,796,447, granted Jan. 10, 1989. In locks of that type, a key is inserted into a key-cylinder and then the key sets a series of transfer tumblers that, in turn, set a series of lock opening elements. As the key-cylinder is rotated, the transfer tumblers are moved out of contact with the elements. Only at this time can the lock be opened, provided that the elements had been set correctly. The improvement in this specification permits the lock to be opened by more than one key. In other words, this lock permits "master-keying".

Abstract: An electronically self-latching cylinder lock comprising a cylinder into which a plug is eccentrically inserted, a plurality pairs of pin tumblers each of which is disposed in one of a plurality of bores formed inside the cylinder and the plug, and a plurality of switches which are controlled by the pin tumblers. The switches are used to actuate an electronic circuit to send out warnings with a buzzer and to secure the plug at its locked position by a latch means, which is controlled by a solenoid, when an incorrect key is inserted into the key way.

Abstract: The lock security device described herein is designed to prevent the turning of the lock from the opposite side of the lock, for example, by the turning of a key from the outside or opposite side of the lock. With most dead bolt door locks there is a knob on the inner side of the door by which the bolt of the lock may be moved forward into a locking position or retracted into an unlocking position. These same actions may be performed by a key inserted into the lock from the outside of the door. The security device is a simple knob on the inner side of the door with a flap which may be turned to press against the inside knob which controls the position of the bolt of the lock. When the bolt is in locked position, this flap is turned toward the bolt controlling knob and engages it to prevent turning of the same into an unlocking position. This flap is prevented from slipping to or from this engaging position by a spring on the inside of the flap knob which exerts pressure against the turning of this flap.

Abstract: This invention describes a lock where each of several tumblers is shaped as a disc and each has gear teeth along parts of its periphery. The teeth mesh with two partial racks that are formed on two side bars. These side bar operate in a manner similar to side bars in many popular locks of to-day. These tumblers are set or re-set into positions by a double bitted key that passes thru a central opening in each tumbler. By rolling the tumblers along the racks on the side bars the lock can be opened or closed. The key can be changed by merely opening the lock with one key and closing it with another.

Abstract: A pin tumbler lock comprises a cylindrical shell, a plug fitted within the shell, and rotatable by key means. The plug has first bores for receiving first pin tumblers. The first bores are substantially normal to the axis of the plug. The shell has second bores for receiving second pin tumblers therein. The second bores are aligned with first bore. First and second pin tumblers are located in bores. The second pin tumblers are forced by a spring into the aligned first bores to thereby prevent rotation of the plug. The first and second pin tumblers have substantially mating surfaces at respective ends providing contact along their entire length. The plug includes two grooves in a plane normal to the axis of the plug along its periphery, one groove on each side adjacent to first bores, thereby providing a non-linear shear line between the plug and the shell.

Abstract: Disclosed is an improvement in the lock mechanism described in U.S. Pat. No. 3,073,143. The improvement comprises barrier walls on the bolt which prevent a shim-type pick device from opening the lock mechanism. The barrier walls are positioned to prevent the pick device from tripping the locking member which locks the deadlock actuator in the locked position.

Abstract: A lock with hidden pins which is characterized by an outer sleeve, a pivot in the inner sleeve, a short tube, and an outer covering for the outer sleeve. The keyhole is positioned in the pivot, and the short tube and the pivot can be aligned. The head and the stem of the key can be disassembled.

Abstract: An axial type, tubular key operated, cylinder lock which utilizes a plurality of spring-biased pin arrangements which are to be movable when connected with the proper key to a shear-line position achieving operation of said lock. A pin arrangement is movable longitudinally to the shear-line position. Any attempt to move a pin arrangement other than with a properly coded key will result in the pin arrangement being laterally deflected to a displaced-fixed position preventing operation of the lock.

Abstract: A cylinder lock system employs a key which has a pair of projections extending from opposing parallel edges of the key blade. The keyway of the lock has an enlarged slot portion for receiving the projections upon insertion of the key. One of the projections cams pins of an auxiliary pin stack to present a shear line between the pins to permit rotation of the key plug to an unlocked mode. The other projection is received in a groove formed in the shell and is engageable against a surface of the groove upon rotation of the key to retain the key within the keyway.