Abstract: A rekeyable lock cylinder comprises a cylinder body and a plug assembly disposed within the cylinder body. The plug assembly comprises a plug body, a plurality of pin assemblies and a guide bar. The plug body has a longitudinal axis, a transverse axis perpendicular to the longitudinal axis and a tool-receiving hole. Each of the pin assemblies is movably disposed in the plug body and comprises a first rack component and a second rack component selectively engaging with the first rack component. The guide bar is coupled to the plug body and has a plurality of pin runners for engaging with the first rack components and a tool-receiving portion exposed by the tool-receiving hole. The guide bar is capable of moving along transverse axis-direction of the plug body to disengage the first rack components from the second rack components.

Abstract: A rekeyable lock cylinder comprises a cylinder body, a plug assembly disposed within the cylinder body and at least one adjusting member. The cylinder body has an inside wall, the plug assembly comprises a plug body having a plurality of pin holes and an opening, a plurality of assembled pins disposed within the pin holes of the plug body and a position block disposed in the plug body. Each of the assembled pins comprises a first rack component having an aligning cavity and a second rack component engaged with the first rack component. The position block has a plurality of pin runners served for disposing the first rack components and a tool-receiving hole corresponding to the opening. The adjusting member is movably disposed within one of the pin holes of the plug body and contacts against at least one first rack component and the inside wall of the cylinder body thereby forming a position difference between the tool-receiving hole and the aligning cavity.

Abstract: The present invention relates to a two-stage lock cylinder structure, which includes a lock casing, a lock barrel and an actuating unit, wherein a first joining member is located at one end of the lock barrel, and the actuating unit is fitted with a corresponding second joining member. Moreover, a flexible member is located between the lock barrel and the actuating unit, and the displacement distance of the first joining member towards the second joining member is smaller than the center distance of any of two through holes of the lock casing. Accordingly, the flexible member and the actuating unit are used to enable achieving two-stage actuation as an unlocking operation for a locking device, thereby providing the present invention with burglar-proof effectiveness.

Abstract: A system for obstructing movement of a pin in a pin tumbler lock is disclosed. The system includes a pin movable in a bore in a plug of a pin tumbler lock, and the pin has a channel formed thereon for receiving a portion of a sidebar of the lock. The system further includes a blocking member mounted on the pin and configured to obstruct movement of the portion of the sidebar along the channel of the pin.

Abstract: A lock and key system is disclosed including locks of the kind comprising a cylindrical key plug (203) with locking tumblers (205) having a body part (206a) and an integral key sensing part (206b) for engagement with an associated key (100). The key sensing part (206b) of each locking tumbler comprises at least two neighbouring key contacting portions (210a, 211a), confined within a limited region, for possible sliding engagement with a longitudinal code pattern of the associated key, at least one but not necessarily all of these key contacting portions of each locking tumbler actually engaging with a corresponding code portion of the associated key upon fully inserting the latter into the key slot of the lock.

Abstract: A key-removable lock core that is retained in a core receptacle by a retaining lug, and which can operated by an operating key to align the pins of the pin chambers for shear at the operating shear line, and to allow the key plug to be rotated, and which employs a control tool with the operating key for manipulating the pins into alignment for shear at the control shear line, to allow the sleeve and the key plug together to be rotated, to move the retaining lug on the sleeve between a projected position in which the lug is engaged behind a rearward-facing shoulder in the core receptacle to retain the core in the receptacle, and a retracted position within the profile of the core.

Abstract: A rekeyable lock cylinder comprises a cylinder body and a plug assembly disposed within the cylinder body. The plug assembly comprises a plug body, a plurality of assembled pins and a position block. The plug body has a longitudinal axis, a transverse axis vertical to the longitudinal axis, a keyhole and a first through hole. Each of the assembled pins is movably disposed in the plug body and comprises a first rack component and a second rack component selectively engaging with the first rack component. The position block disposed at the plug body has a plurality of pin runners used for disposing the first rack components, a second through hole corresponding to the first through hole and a tool-contacting surface located within the second through hole. The position block can move along the transverse axis-direction of the plug body to make each of the first rack components reengage with each of the second rack components.

Abstract: A removable core lock and key device comprises a cylinder housing (10) and a cylinder core (20), which is accommodated in a circular opening in the cylinder housing. A plurality of pin tumblers (22) are movable under influence from code surfaces of a key, wherein at least part of the pin tumblers are provided in a recess (20b) in the mantle surface of the cylinder core. A cam adapter (40) is rotatably provided in the opening in the cylinder housing. The cam adapter comprises an engagement portion (40c) which engages the recess (20b) in the mantle surface of the cylinder core when the cylinder core is in an operative position, wherein at least one of the pin tumblers is movable between a blocking position, in which the engagement portion of the cam adapter cooperates with the at least one pin tumbler to prevent mutual axial movement of the cam adapter and the cylinder core, and a release position, in which mutual axial movement between the cam adapter and the cylinder core is allowed.

Abstract: A key-operated lock that can be programmed for use with one of a plurality of user keys without disassembling the lock or replacing the tumblers, that employs a programming key and an integral change tool to effect the lock programming. The lock can be configured to permit or to prevent use of the user key to program or reconfigure the lock. The lock is typically manually latched or bolted into a locked configuration. The integral change tooling simplifies the lock programming operation, and avoids the need for carrying a separate change tool.

Abstract: A lock cylinder has a reset condition wherein the lock cylinder can be put into a “learn” mode. In the “learn” mode, the original key can be removed and replaced by replacement key and, when the replacement key is removed, the lock cylinder 10 is rekeyed to the new key. The original key no longer operates the rekeyed lock cylinder 10.

Abstract: The present application relates to lock assemblies that provide a secondary coupling point, utilizing an anti-rotation pin or extended tailpiece leg or other method, which rotationally couples the tailpiece to the cylinder plug, thereby preventing rotation of the tailpiece independently of the cylinder plug. Therefore, a tailpiece within a bolt cam or other actuator used to withdraw a bolt or unlock a lockset cannot be rotated after the tailpiece connector connecting the tailpiece to the cylinder plug has been forcibly removed, severed, or destroyed.

Abstract: A lock cylinder having a keyway includes a first plurality of guide channels. A plurality of cup-shaped pins is movably disposed within the first plurality of guide channels. Each cup-shaped pin of the plurality of cup-shaped pins extends across the keyway. Each cup-shaped pin of the plurality of cup-shaped pins has an engagement protrusion. The first plurality of guide channels conform to the shape of the plurality of cup-shaped pins to allow movement of the plurality of cup-shaped pins in a first direction while restraining movement transverse to the first direction. A plurality of biasing springs is positioned to bias the plurality of cup-shaped pins in a direction toward the keyway. A plurality of racks is movably disposed in a second plurality of guide channels. Each rack of the plurality of racks has at least one engagement groove to selectively receive the engagement protrusion of a respective cup-shaped pin.

Abstract: A cylinder lock includes a lock housing receiving a plug assembly that has a key hole, tumbler pieces having respective toothed parts, and a re-keying unit. The re-keying unit has rotatable gear wheels engaged releasably with the respective toothed parts to reposition the respective tumbler pieces. The gear wheels disengage from the respective tooth parts by moving transversely of a longitudinal axis of the lock housing. Re-keying methods are also disclosed.

Abstract: A key-operated cylinder lock for operating a bolt or a latch, that can be programmed for use with one of a plurality of user keys without disassembling the lock or replacing the tumblers, with reduction or elimination of incidental or accidental re-keying of the lock. The lock has a rotating plug having one or more retainer cavities formed into the periphery, and lock configuration change balls, movable within the lock between a first position within a driver chamber and a second position within a corresponding retainer cavity when the plug is in a programming position. The positioning of the change balls within either the pin chambers or the retainer cavities determines the key configuration that can operate the lock. The lock employs a means for isolating selectively the retainer cavities from the corresponding driver chambers when the plug is in the programming position, to prevent incidental or accidental movement of the change members from the driver chamber into the retainer cavities.

Abstract: The invention is concered with a locking cylinder (1) and a matching key (2), wherein the locking cylinder comprises tumbler pins (6) with a head (7) and a tip. (8). The tip (8) engages in a coding recess (10) of the key (2) and, by withdrawing the key from the locking cylinder, slides along two sliding flanks (2), which follow on one another. The dimensions of the conical surface (9) following on from the rounding of the tip (8) and the sliding flank (12) are made to match one another in such a way that the transitional region (13) between the two sliding flanks is covered by the conical surface in the abutting position.

Abstract: A rekeyable lock cylinder structure comprises a shell, a plug assembly and a plurality of pin groups. The shell has a hollow cylindrical portion and defines a central axis. The plug assembly is disposed within the hollow cylindrical portion of the shell and comprises a plug body and a sliding block. The plug body has a front section, a driving portion, a middle section connecting the front section and the driving portion, a coupling cavity recessed from the front section and the middle section and a plurality of lower pin holes formed in the middle section and communicating with the coupling cavity. The sliding block, which is disposed at the coupling cavity of the plug body and able to move parallel to the central axis of the shell, has a plurality of pin-sliding grooves and a keyhole communicating with the pin-sliding grooves.

Abstract: A lock cylinder that includes a housing and a plug. The housing defines a cylindrical cavity, and an outer pin chamber in communication with the cavity. The plug is rotatable within the cavity, and includes a key slot, a cylindrical outer surface, and an inner pin chamber aligned with the outer pin chamber when the plug is in a locked position. An outer pin is housed in the outer pin chamber, and an inner pin is housed in the inner pin chamber. The inner pin is engageable with a key inserted into the key slot, and further engageable with the outer pin. The lock cylinder also includes a lock member in communication with the housing and the plug that selectively disables the lock cylinder in response to partial rotation of the plug from the locked position without an appropriate key in the key slot.

Abstract: A key-operated cylinder lock for operating a bolt or a latch, that can be programmed for use with one of a plurality of user keys without disassembling the lock or replacing the tumblers, with reduction or elimination of incidental or accidental re-keying of the lock. The lock has a rotating plug having one or more retainer cavities formed into the periphery, and lock configuration change balls, movable within the lock between a first position within a driver chamber and a second position within a corresponding retainer cavity when the plug is in a programming position. The positioning of the change balls within either the pin chambers or the retainer cavities determines the key configuration that can operate the lock. The lock employs a means for isolating selectively the retainer cavities from the corresponding driver chambers when the plug is in the programming position, to prevent incidental or accidental movement of the change members from the driver chamber into the retainer cavities.

Abstract: A lock system includes keys, key blanks, keyways, and lock cylinders, and the keys or key blanks have opposite sides formed with grooves for cooperating with a conforming keyway. More particularly, the sides of the key or key blank have a portion grooved for registration, another portion grooved for top-level hierarchical master keying, and two other portions, one on each side of the blade, for further master key variations and different combinations. One of the two further sections being curvilinear and the other rectangular or angular cuts. The conforming keyway of the lock includes ridges and grooves corresponding to the grooves and ridges, respectively, of the key or key blank. Instruments other than keys or key blanks may be used to enter the grooves and ridges of the keyway to operate the lock without the use of a precisely configured key.

Abstract: A bump resistant pin-tumbler lock having a housing; a plug rotatably mounted within the housing and having a keyway; and a shear line defined between the interface between the plug and housing. The plug has one or more pin chambers extending from and orthogonally to the shear line and the keyway, wherein each pin chamber is capable of housing a bottom pin and is aligned with a corresponding driver chamber when the plug is in a locked position. Each driver chamber extends into the housing from and orthogonally to the shear line, includes a biasing means and is capable of housing one or more top pins. The plug further includes a bottom pin retaining means extending into one of the pin chambers so as to selectively retain a predetermined bottom pin in its respective pin chamber and prevent the predetermined bottom pin from fully extending into the pin chambers, such that, in use, kinetic energy cannot be transferred to the predetermined bottom pin from a bump member.

Abstract: A system for obstructing movement of a pin in a pin tumbler lock is disclosed. The system includes a pin movable in a bore in a plug of a pin tumbler lock, and the pin has a channel formed thereon for receiving a portion of a sidebar of the lock. The system further includes a blocking member mounted on the pin and configured to obstruct movement of the portion of the sidebar along the channel of the pin.

Abstract: A lock cylinder including a housing defining a cylindrical cavity, and a plug disposed in the cylindrical cavity and rotatable between a locked position and an unlocked position. The plug includes an inner pin chamber aligned with an outer pin chamber of the housing when the plug is in the locked position. An inner pin is housed in the inner pin chamber and is engageable with the outer pin when the plug is in the locked position, and includes an outer surface having a non-axial groove. The non-axial groove has a curved surface that defines a substantially semi-circular cross-section. An engagement member is supported by the plug and has a substantially semispherical end portion extending into the non-axial groove such that the semispherical end portion is substantially engaged with the curved surface.

Abstract: A pin remover device for removing a pin stopper from the upper end of its chamber in a lock housing. The pin stopper has a hole bored from the end of the pin stopper open to the outside of said housing, at least partially along its longitudinal axis, and the device comprises a mechanism comprised of an insertion component for inserting into said hole, and for removing the pin stopper from the chamber.

Abstract: A programmable lock for unlatching a bolt or a latch, that can be programmed for use with one or a set of main user keys without disassembling the lock or replacing the tumblers. The lock can also be programmed for operation with a temporary access key, associated with the main user key, which can operate the lock. The operation of the lock with the temporary access key can be canceled by again inserting the main user key into the keyway and operating the lock. The lock can also be automatically configured to operate with a second successive main user key that has a different though complementary configuration, by inserting and rotating the second successive main user key in the lock.

Abstract: An electronic combination lock includes a door handle having a code entry button and housing a lock assembly and an electrical circuit. The lock assembly includes a lock body, a rotating cylinder, spring loaded lift lock pins and corresponding key pins, a reset cam path and a programming cam path formed on the cylinder, a lift comb for lifting the lift lock pins, a latch for latching the lift comb and a magnet being selectively activated to cause the latch to release the lift comb. The electrical circuit receives a first input signal indicative of an input code entered at the code entry button and a second input signal from a program switch actuated by the programming cam path and is operated to store an entry code when the program switch is actuated and to activate the magnet when an input code matching the stored entry code is received.

Abstract: A lock includes a housing with a plug located in the housing. The plug is adapted to rotate in the housing about an axis. The lock also includes a moveable element comprising a first region with a first diameter, a second region with a second diameter that is less than the first diameter, and a third region with a third diameter that is less than the second diameter. The moveable element is located at least partly in the housing. The moveable element is adapted to move in an axis of motion substantially radial relative to the axis of the plug and to prevent rotation of the plug when the moveable element is in a first position along the axis of motion and to allow rotation of the plug when the moveable element is in a second position along the axis of motion.

Abstract: A cylinder and key combination including a pin operated cylinder including a cylinder body, a plug rotatable within the cylinder body and defining a keyway and first pin assemblies and at least one second pin assembly communicating with the keyway and being selectably positionable by key cuts on a key inserted into the keyway for positioning the pin assemblies with respect to a shear line between the cylinder body and the plug to permit rotation of the plug with respect to the cylinder body and a key, including a shank defining at least one planar surface configured to define a longitudinally extending key-cut region thereon, the longitudinally extending region having formed thereon a plurality of first key cuts configured to position a plurality of first pins at a desired shear line position and having pre-formed thereon at least one second key cut configured to position a corresponding at least one second pin assembly at a desired shear line position.

Abstract: A key for use in a cylinder lock with a rotatable key plug having a profiled keyway including a longitudinal profile rib at a side wall of the keyway. The key has an elongated, substantially flat key blade (120; 120?) having a longitudinal profile groove (122; 122?) extending along at least a portion of the length of the key blade. The groove has an undercut portion (129) adjacent to a ridge portion (128, 128?), the outside of which forms part of a side surface (123; 123?) of the key blade and the inside of which comprises a side wall portion (126; 126?) being inclined and facing the bottom wall (124; 124?) of the groove. The undercut portion (129; 129?) of the groove is expanded, at its innermost part adjacent to the inclined side wall portion (126; 126?), into a longitudinally extending pocket (135; 135?).

Abstract: A cylinder lock device including: a body housing having a bore having a first end and a second end, with a direction of elongation defining an axial direction for the device; a rotatable cylindrical plug in the bore, the plug having an axially extending key slot from the first end; a plurality of tumbler pins deployed at least partially within the plug and displaceable by a key to enable rotation of the plug; and an opening mechanism comprising a shaft connected to a key emulator and wherein the key emulator is translatable into the key slot from within the body housing, the key emulator shaped to match and engage the plurality of tumbler pins, and adapted to displace the plurality of tumbler pins, thereby selectively enabling rotation of the plug.

Abstract: A rekeyable lock cylinder includes a plug body and a backing rack that cooperate to define a plurality of pin chambers within the lock cylinder, with each of the pin chambers housing a corresponding pin. Movement of the backing rack changes the configuration of the pin chambers, thereby allowing the corresponding pins to change configuration to match the bitting on a valid key.

Abstract: A rekeyable lock cylinder comprises a cylinder body and a plug assembly disposed within the cylinder body. The plug assembly comprises a plug body, a plurality of assembled pins, a position block and a rotating member. The plug body has a longitudinal axis, a transverse axis perpendicular to the longitudinal axis and a first through hole. Each of the assembled pins is movably disposed in the plug body and comprises a first rack component and a second rack component selectively engaging with the first rack component. The position block is disposed at the plug body and has a plurality of pin runners for disposing the first rack components and a second through hole corresponding to the first through hole.

Abstract: A rekeyable lock cylinder comprises a cylinder body and a plug assembly disposed within the cylinder body. The plug assembly comprises a plug body, a plurality of pin assemblies and a guide bar. The plug body has a longitudinal axis, a transverse axis perpendicular to the longitudinal axis and a tool-receiving hole. Each of the pin assemblies is movably disposed in the plug body and comprises a first rack component and a second rack component selectively engaging with the first rack component. The guide bar is coupled to the plug body and has a plurality of pin runners for engaging with the first rack components and a tool-receiving portion exposed by the tool-receiving hole. The guide bar is capable of moving along transverse axis-direction of the plug body to disengage the first rack components from the second rack components.

Abstract: A high security key blade and key for use with a lock having a cylindrical shell, a key plug which is rotatably mounted in the shell, a longitudinal key slope in the key plug, and at least one locking tumbler assembly cooperating with a key being inserted into the lock. The locking tumbler assembly includes a pair of independently movable tumbler segments which are positionable in different elevational positions in a common cavity.

Abstract: A rekeyable lock cylinder comprises a cylinder body and a plug assembly disposed within the cylinder body. The plug assembly comprises a plug body, a plurality of pin assemblies and a guide bar. The plug body has a longitudinal axis, a transverse axis perpendicular to the longitudinal axis and a tool-receiving hole. Each of the pin assemblies is movably disposed in the plug body and comprises a first rack component and a second rack component selectively engaging with the first rack component. The guide bar is coupled to the plug body and has a plurality of pin runners for engaging with the first rack components and a tool-receiving portion exposed by the tool-receiving hole. The guide bar is capable of moving along transverse axis-direction of the plug body to disengage the first rack components from the second rack components.

Abstract: A lock cylinder that includes a housing defining a cylindrical cavity, and a plug disposed in the cylindrical cavity and rotatable between a locked position and an unlocked position. The plug includes a key slot and an inner pin chamber aligned with an outer pin chamber of the housing when the plug is in the locked position. An inner pin is disposed in the inner pin chamber for movement along an axis, and is engageable with the outer pin when the plug is in the locked position. The inner pin is engageable by a key inserted into the key slot, and includes an outer surface that defines a non-axial groove. An engagement member is supported by the plug and extends into the groove.

Abstract: A reset cradle with integral reset tool assembly, that automatically positions the lock cylinder, the reset tool assembly, and all associated components, and choreographs the operations that need to be performed in the right sequential order. The reset cradle generally comprises a two-section housing including a base section with centrally-protruding tubular post into which the lock cylinder may be inserted, and a separate hub section rotatably seated on the base. Inside the housing, a cam is engaged against the post and is rotatable thereabout along with relative rotation of the two-section housing. A reset member is also operative inside the housing, and is engaged by rotation of the cam for axial displacement into the lock cylinder. Similarly, a detent pin is slidably seated in the post and is engaged by the cam for axial displacement into the lock cylinder.

Abstract: A lock core assembly has a lock shell, a lock core and a pin segment. The lock shell has a core mount, multiple upper pin chambers, a lid and at least one retaining flange. The lock core is mounted rotatably in the core mount and has a keyhole and multiple lower pin chambers. The lower pin chambers are formed radially through an outer surface of the lock core, communicate with the keyhole, align longitudinally, correspond to and communicate with the upper pin chambers. The pin segment is mounted between the lock shell and the lock core and has multiple abutting pin assemblies and at least one suspended pin assembly. When knocked, a suspended upper pin of the at least one suspended pin assembly prevents the pin aligning and the lock core from rotating, the lock core assembly provides a preferred burglarproofing effect.

Abstract: A bump proof lock has stationary part and movable part in lockable sliding contact with each other. The stationary part has first passages and a driver pin slidably disposed in each first passage. The movable part has: A key way for receiving a key with key shank. Second passages arranged in pair wise communication with first passages. A key pin slidably disposed in each second passage. Each key pin has a pre-determined length such that the lengths define a unique key pin spatial profile. One end of each key pin is in sliding contact with the key shank and another end of each key pin is in slidable contact with its corresponding driver pin forming a local key-driver pin pair and a global key-driver contact spatial profile. Numerous key-driver pin pairs are made of magnets attracting each other causing the pairs to resist separation under a mechanical shock.

Abstract: A lock system includes keys, key blanks, keyways, and lock cylinders, and the keys or key blanks have opposite sides formed with grooves for cooperating with a conforming keyway. More particularly, the sides of the key or key blank have a portion grooved for registration, another portion grooved for top-level hierarchical master keying, and two other portions, one on each side of the blade, for further master key variations and different combinations. One of the two further sections being curvilinear and the other rectangular or angular cuts. The conforming keyway of the lock includes ridges and grooves corresponding to the grooves and ridges, respectively, of the key or key blank. Instruments other than keys or key blanks may be used to enter the grooves and ridges of the keyway to operate the lock without the use of a precisely configured key.

Abstract: A changeable lock assembly suitable for re-keying a lock without disassembly of the lock. The assembly includes a housing having a bore therein, and a plug rotatably mounted in the bore. The plug includes a longitudinal axis and a keyway. The keyway is adapted to receive at least a first user key and a second user key. The lock further includes a change member movable within the lock between a first position to a second position. The change member can move solely in response to operation of the second key. Thus, when the change member is in the first position, the first key operates the lock, and when the change member is in the second position, the first key does not operate the lock. The lock assembly can also employ a change tool that, when inserted into a change slot, can move a change ball from the second position back to the first position.

Abstract: A lock and a cooperating key combination is disclosed, the lock comprising a stator and a rotor with a keyway, the key comprising a penetrating portion for insertion in the keyway. The penetrating portion includes at least on combination surface and at least one movable element that can be extended beyond at least one surface of the key, adding height to the surface of the key and for cooperation with at least one first control element for controlling rotation of the rotor. At least one second control element for controlling the rotation of the rotor is provided in the lock opposite the first control element with the keyway in between, the second control element adapted to cooperate with an aperture located on the opposite surface of the key, behind the movable element.

Abstract: This invention is to provide a method for rekeying a rekeyable lock cylinder. The first step of entire rekeying process is to insert a first user key into a keyhole of a sliding block of a plug assembly and turn the first user key to rotate the plug assembly, then a thrust is added to the first user key to move the sliding block of the plug assembly, thereby disengaging a plurality of upper locking pieces and a plurality of lower locking pieces within a plurality of lower pin sets. Next, after pulling out the first user key from the keyhole, a second user key is inserted into the keyhole of the sliding block and turned to restore the sliding block as to reengage the upper locking pieces and the lower locking pieces. Finally, the second user key is pulled out to complete the entire rekeying process.

Abstract: A modified pin to be used in an existing tumbler and pin lock to prevent the lock from unauthorized operation by a lock-picking technique known as “bumping.” A modified replacement pin is provided for an existing pin and tumbler lock. This modified replacement pin fits within the rotatable plug in the pin and tumbler lock. It replaces one of the longer pins of an existing pin set. The existing pin is cylindrical in shape. To modify the pin, a symmetrical notch is cut in proximity to one end of the pin. This notch causes the modified pin to catch on the plug during an attempted unauthorized opening by bumping the lock. Because the notch catches on the plug, it prevents the plug from turning. This effect is momentary but is enough to allow remaining pins in the pin and tumbler lock to fall into place to prevent the plug from turning and unauthorized operation of the lock.

Abstract: An anti-theft pin tumbler lock includes a lock core and a lock body having a bore and at least one first bore. The lock core includes a keyway mounted therein, and one second bore formed therein and aligned with at least one first bore. One spring, one pin and one tumbler are sequentially received in the first and second bores and blocked using one plug. At least one second bore is configured in a stepped form, in which a diameter of one end is larger than that of another one, and the tumbler is configured in a corresponding form, in which the relative large diameter end thereof lies in the larger diameter second bore, while the relative small diameter end lies in the smaller diameter bore. An anti-bump space between the smaller diameter end and the end of the second bore adjacent to keyway is created.

Abstract: A rekeyable lock cylinder includes a cylinder body with a longitudinal axis. A plug assembly is disposed in the cylinder body and is rotateable between a first position and a second position, the plug assembly having a lock face with a tool receiving aperture. A plurality of key followers and a corresponding plurality of racks are disposed in the plug assembly. The plurality of racks is selectively engageable with the plurality of key followers. A first member is coupled to the plurality of racks. The first member is moveable in response to application of a force against the first member by a tool received through the tool receiving aperture. The first member is configured to simultaneously disengage all of the plurality of racks from the plurality of key followers in response to the movement of the first member.

Abstract: A lock cylinder structure mainly comprises a cylinder shell, a plug and a pin group. The cylinder shell has a housing and the plug is rotatably positioned within the housing of the cylinder shell. The plug has at least one first lower pin hole and at least one second lower pin hole having a circular-cylindrical inside wall and a stopper portion formed at the circular-cylindrical inside wall. The pin group comprises at least one first lower pin and at least one second lower pin, the first lower pin is slideably positioned in the first lower pin hole of the plug and has a first end, and the second lower pin is slideably positioned in the second lower pin hole and has a tube body and a cover. The tube body has a limit protrusion and a second end, and the cover is adaptably coupled to the tube body. The limit protrusion is blocked at the stopper portion of the second lower pin hole and there is a height difference between the second end of the tube body and the first end of the first lower pin.

Abstract: A programmable lock cylinder assembly comprising a lock housing and a cylinder plug mounted for rotation within the housing. A set of rack pins are positioned in the cylinder plug and moveable between a locked position and an unlocked position. A set of tongue pins are positioned in the cylinder plug and extend across the keyway. Each tongue pin is selectively engagable with a respective rack pin. A re-combinating member is engaged with the tongue pins and moveable between a first position wherein the tongue pins are engaged with the rack pins and a second position wherein the tongue pins are disengaged from the rack pins. A reset actuator is positioned within the cylinder plug and moveable between an engaged position wherein the re-combinating member position is locked relative to the cylinder plug and a non-engaged position wherein the re-combinating member position is moveable relative to the cylinder plug.

Abstract: A headed pin for use in pin tumbler locks is provided with a release diameter cylindrical body having an enlarged diameter axially short head at one end, the reduced diameter body being received internally of a biasing spring which bottoms against an underside of the head, the spring extending beyond the end of the cylindrical body opposite the head, and the headed pin and spring being received in one or more of the pinholes as the upper pin in a pin tumbler lock.

Abstract: A lock cylinder that includes a housing and a plug. The housing defines a cylindrical cavity, and an outer pin chamber in communication with the cavity. The plug is rotatable within the cavity, and includes a key slot, a cylindrical outer surface, and an inner pin chamber aligned with the outer pin chamber when the plug is in a locked position. An outer pin is housed in the outer pin chamber, and an inner pin is housed in the inner pin chamber. The inner pin is engageable with a key inserted into the key slot, and further engageable with the outer pin. The lock cylinder also includes a lock member in communication with the housing and the plug that selectively disables the lock cylinder in response to partial rotation of the plug from the locked position without an appropriate key in the key slot.

Abstract: A lock core assembly has a lock shell, a lock core, multiple pin assemblies and at least one anti-knock pin assembly. Each pin assembly is mounted in a mounting chamber formed radially in the lock shell and through the lock core. Each anti-knock pin assembly has an upper pin and a major spring abutting each other and is mounted in a corresponding characteristic chamber assembly with a core chamber and at least one limiting recess communicating with each other. When a burglar turns the lock core by using a lock pick to vibrate or knock the lock core, the major spring presses the upper pin to engage in the limiting recess to limit the lock core and provide a reliable and reusable burglarproof lock that need not be replaced after an attempted malicious opening.