Abstract: A latch has a bushing which has at least one bushing projection or means for preventing insertion of an unauthorized tool to rotate a latch actuator of the latch. Only a key having an outer key recess which can mate with bushing projection on the bushing permits insertion of the key. The cap subassembly of the latch is provided with projections which are of a size and so positioned as to correspond with the internal recesses of the key so as to allow the cap subassembly to enter into the bore of the key and permit a mating engagement of internal recesses on the key and projections on the cap subassembly. Because cap portion rotates freely on top of the cap subassembly which is the part of the cap driven by the key, the arrangement makes it impossible, or at least very difficult, to rotate the shaft and in turn the pawl by means of a tool which rotates the cap portion.

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 and a lid. 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 pin assemblies and at least one suspended pin assembly. When knocked, a suspended upper pin of the at least one suspended pin assembly oscillates to prevent the pin aligning and the lock core from rotating, the lock core assembly provides a preferred burglarproofing effect.

Abstract: A tubular lock is disclosed. The tubular lock includes an outer portion, and an inner portion. A plurality of movable driver pins is disposed between the outer portion and the inner portion. The pins are accessible through a space formed by the outer portion and the inner portion. At least one fixed structure prevents an unauthorized tubular lock picking structure from entering the space.

Abstract: A method and assembly for preventing unauthorized manipulation of common cylinder locks, as executed by use of the principles of the Bumpkey or Blowgun methods. The pin assembly, containing a tumbler pin and a driver pin, is adapted so as to alter linear displacement thereof, by forming a recession in one of the pins contained in the pin assembly, and an engagement element, in the other of the pins, for engaging the recession, such that when an impact-driven blow of a given intensity is applied so as to linearly displace the tumbler and driver pins, the pin engagement element engages the pin recession, strongly binding the tumbler and driver pins together, thereby, blocking the shear line and, consequently, preventing unauthorized manipulation of the common cylinder lock.

Abstract: A lock includes a cylinder, a cylinder plug and a locking pin assembly. The cylinder plug is rotatably mounted in the cylinder and has a dummy keyhole and a cylinder plug keyhole defined completely through the cylinder plug. The locking pin assembly has multiple locking pins that are slidably partially held in the cylinder plug keyhole. A two step method to open the lock with a key with serrations initially inserts the key serrations into and presses the key serrations completely through the dummy keyhole. Then the serrations are rotated, aligned with and pulled back into the cylinder plug keyhole. Conventional displacement of the locking pins allows the cylinder plug to be rotated, which opens the lock. Pressing the key completely through the lock removes any foreign objects such as toothpicks, chewing gun or pieces of paper and allows the lock to be opened.

Abstract: A lock with an improved configuration comprises a housing and a cylindrical member mounted in the housing. A lock core is mounted in the cylindrical member. The lock is characterized in that the cylindrical member comprises either nine or eleven pin recesses at the front end, a disc and an engaging post having a dodecagonal section are mounted at the front end of the lock core, and the disc comprises nine through passages and three openings of different depths. Based on the configuration of the lock, the key to be inserted into the lock must have a dodecagonal inner passage to match the dodecagonal section of the engaging post of the lock. Because of the three openings of different depths, a thief cannot use specialized tools to explore the lock and unlock the lock. The number of codes of the lock is increased to keep the lock from being easily unlocked. The owner's property and privacy of are thus protected.

Abstract: A lock plug comprising a top end having a key way etched out of a solid wall, the key way leading to an interior of the lock plug housing a locking mechanism; and, a break away wall bordering a cavity carved out from the solid wall on a side of the key way, the break away wall forming a side of the key way. The locking mechanism in a lock plug usually employs the wafer technology and in this case, the interior of the lock plug includes a wafer cavity having wafers designed according to a particular key code.

Abstract: The lock cylinder assembly of the present invention incorporates a number of features designed to defeat attempts to pick or destroy the lock. The lock cylinder assembly employs multiple arrays of pass key pins, making picking of the lock much more difficult. Second, the arrangement of the pass key pins in separate arrays requires that multiple cuts would have to be made into the lock housing mogul or cylinder blank in order to defeat the lock cylinder assembly. Third, the lock cylinder assembly of the present invention may incorporate multiple sets of hardened dowel pins to prevent drilling through the lock housing mogul in the area of the driver pins. Fourth, the lock cylinder assembly of the present invention may incorporate a hardened cylinder shield behind the front face of the cylinder blank to prevent drilling through the cylinder blank.

Abstract: Disclosed is a lock cylinder and key set, which includes a lock cylinder, which has a keyway with two keyholes separated by a partition, and a key, which has two blades insertable into the two keyholes of the keyway for acting against respective pins in the lock cylinder to unlock the lock cylinder.

Abstract: The present invention provides a burglarproof lock core structure which forms a curved passage between a key slot of a plug and a lower pin chamber, such that at least a bending concave surface offsetting the center of the key slot is formed at one side, and cone apexes of a plurality of lower pins are extended out of the lower pin chamber and aligned in the wall edge of the key slot. Moreover, a control valve with a cone apex is located at the other end corresponding to the bending surface inside the key slot, such that a key with curvature corresponding to the passage and notches corresponding to the cone apexes is required to open the lock, thereby having the effect of high security of burglarproof.

Abstract: An anti-picking cylinder lock including a lock body, a plug defining a keyway, a plurality of telescopic body pin assemblies, each of the telescopic body pin assemblies including an outer body pin and an inner body pin and a plurality of telescopic plug pin assemblies, each of the telescopic plug pin assemblies including an outer plug pin and an inner plug pin, wherein at least one of the outer plug pins and the outer body pins is formed with at least one inner facing recess configured and arranged such that, upon an attempted picking of the lock, a portion of at least one of the inner plug pins and the inner body pins tends to engage the at least one recess, thus causing at least one of the inner plug pins and the inner body pins to move together in at least one direction.

Abstract: A pin tumbler lock is provided with one or more additional chambers for housing a secondary locking member for engagement with a portion of a key. The invention also provides a lock system comprising a plurality of locks, each lock including two chambers. The lock system has a potential of N chamber positions to provide a substantial increase in the number of effective unique pin tumbler combinations that can be produced on the same key section or profile by allowing the same pin tumbler combination to be repeated with different locations of these additional chambers.

Abstract: A lock includes a body defining a first bore having a lock core mounted therein, and a second bore having an engaging element inserted thereinto; and a front barrier shield fixedly mounted in the body in front of the lock core. A communicating hole is formed in the body behind the lock core to communicate the two bores. A locking pin is disposed in the communicating hole to move into or out of a locking hole formed on the engaging element under control of the lock core, so as to lock or release the engaging element to or from the body, respectively. The front barrier shield includes a plurality of axially spaced and staggered barrier sheets to define a zigzag keyway, preventing a thief from peeping through the first bore and destructing the lock core.

Abstract: A re-keyable lock and method. The lock has locked and unlocked positions and includes a housing and a cylinder rotatably supported in the housing. The lock includes a plurality of wafer tumblers resiliently supported in corresponding channels formed in the cylinder. Each wafer tumbler includes a rider element selectively engaged with a base element in first and second engagement positions, wherein the first engagement position corresponds to a first key and the second engagement position corresponds to a second key. The lock also includes a re-keying mechanism such as a re-keying tool which is inserted in a re-keying slot when the lock is in the unlocked position to disengage the rider element from the corresponding base element in the first engagement position and to re-engage the rider element to the base element in the second engagement position.

Abstract: The lock cylinder assembly of the present invention incorporates a number of features designed to defeat attempts to pick or destroy the lock. The lock cylinder assembly employs multiple arrays of pass key pins, making picking of the lock much more difficult. Second, the arrangement of the pass key pins in separate arrays requires that multiple cuts would have to be made into the lock housing mogul or cylinder blank in order to defeat the lock cylinder assembly. Third, the lock cylinder assembly of the present invention may incorporate multiple sets of hardened dowel pins to prevent drilling through the lock housing mogul in the area of the driver pins. Fourth, the lock cylinder assembly of the present invention may incorporate a hardened cylinder shield behind the front face of the cylinder blank to prevent drilling through the cylinder blank.

Abstract: A lock assembly includes a lock cylinder, for actuating a latch assembly, including a lock sleeve, first and second lock rotors, having first and second keyways respectively, rototably fitted in the lock sleeve, and a plurality of tumblers for locking up the first and second lock rotors. A key includes a key head having predetermined locking serrations arranged in such a manner that when the key head is inserted into the first keyway, the locking serrations are adapted to unlock the first lock rotor and enable the first lock rotor freely rotating until the first keyway is aligned with the second keyway, simultaneously, the key head being adapted to insert into the second keyway such that the locking serrations are adapted to unlock the second lock rotor to enable the second lock rotor to freely rotate to control the locking and unlocking of the latch assembly.

Abstract: A closing device includes a cylinder core with followers and a closing cylinder with a freewheel sleeve and a housing accommodating the sleeve. Normally, a coupling slider is coupled to the cylinder core by a restoring force, but is decoupled therefrom in the event of overcharge. An axial connection is provided between the coupling slider and a locking and controlling member. The slider and the locking and controlling member can be radially moved, however, can be rotated between various rotational positions of the closing cylinder when the cylinder core is actuated using a key. The closing cylinder has two key removal positions. The coupling slider is displaced in the angle thereof by turning the key between at least two rotational positions which correspond to the key removal positions. The coupling slider can be radially displaced in the direction of the rotational positions. At least one locking and controlling member is allocated to each of the rotational positions.

Abstract: An improved tubular-type locking cylinder and dedicated key that provides for both theft- and trip-resistant tumbler pin assemblies, wherein the locking cylinder is comprised of an outer housing, a main base, a locking cylinder shaft, and a plurality of tumbler pin assemblies. The improved features are that a detent slot is formed in the interior wall along the locking cylinder shaft recess through the center of the main base body. The locking cylinder shaft consists of a bore through the center of the shaft member up to its top extremity, a movably disposed catch bolt and spring, and a plug obstructing the opening of the bore. A horizontal passage for seating a steel ball is formed in the shaft member at the lower side of a tumbler pin disc. A locating pin is horizontally situated near the upper extremity at one side of the catch bolt. A keyway slot is formed in the shaft member that is contiguous to the upper end of the bore.

Abstract: A lever lock apparatus having a sliding bolt, a detent mechanism for locking the bolt against sliding movement and a plurality of levers. When using the appropriate key, the detent moves to allow the bolt to be slid to a locked or unlocked position. When the lock is under attack, and an inward force is applied to the bolt, the detent moves so as to maintain a detent fence away from the levers. Keeping or moving the fence away from the levers impairs the ability to pick or otherwise attack the lock.

Abstract: A core assembly for a lock includes a core, a sleeve, and a housing. The core has a keyhole longitudinally defined therein. An elongated slot is defined beside and communicated with the keyhole. Multiple lower lock balls are received in the core and not aligned with the elongated slot. The sleeve is securely provided outside the core. The housing is provided outside the sleeve, and has multiple upper lock balls corresponding to the lower lock balls. The lower lock balls are not accessible directly through the keyhole and the elongated slot, so that it is impossible to unlock the lock by a tool without a correct key, and the lock has a high security.

Abstract: A trunk lid or back door of a vehicle includes an inner panel and an outer panel, and a gap is formed between the inner panel and the outer panels. A reinforcement member is provided outside the inner panel at a position corresponding to an attachment unit of a latch. An extending portion of the reinforcement member extends to the outer panel and is provided with an attachment portion which is fixed on the outer panel. The latch is provided inside the inner panel and a latch disengaging lever is attached to the latch at the outer side thereof in a rotatable manner. In addition, the extending portion of the reinforcement member is positioned directly above the latch disengaging member.

Abstract: A cylinder lock with a body, in which a plug with a profiled, axially extending key slot is rotatably arranged, and in which the body and the plug are provided with a number of bores approximately perpendicular to the plug axis, in which bores a number of locking pins is provided, said locking pins consisting of tumbler pins and driver pins, and in which the locking pins are lifted by insertion of a key so that the end faces of the tumbler pins flush with the periphery of the plug. With a view to preventing the lock from being opened with a tool which has a striking effect on the locking pins, at least one of the driver pins consists of two members, one member being movable relative to the second one in the longitudinal direction of the pins, and the movable member abutting in the rest position against the second member with a contact portion directed towards the plug.

Abstract: A lock assembly incorporating a number of features designed to defeat attempts to pick or destroy the lock. The lock cylinder assembly employs multiple arrays of pass key pins, making picking of the lock much more difficult. Second, the arrangement of the pass key pins in separate arrays requires that multiple cuts would have to be made into the lock housing mogul or cylinder blank in order to defeat the lock cylinder assembly. Third, the lock cylinder assembly of the present invention may incorporate multiple sets of hardened dowel pins to prevent drilling through the lock housing mogul in the area of the driver pins. Fourth, the lock cylinder assembly of the present invention may incorporate a hardened cylinder shield behind the front face of the cylinder blank to prevent drilling through the cylinder blank.

Abstract: A lock core device of an anti-theft tumbler pin type includes a housing defining a lock core hole, a plurality of first tumbler pin holes, at least one side tumbler pin hole, and a transverse hole, a lock core rotatably mounted in the housing and defining a plurality of second tumbler pin holes which are moved by the lock core to align with the first tumbler pin holes and to align with the side tumbler pin hole, a plurality of tumbler pin sets each slidably mounted in the first tumbler pin hole and each including a top tumbler pin and a bottom tumbler pin movable in the second tumbler pin hole, at least one block pin slidably mounted in the side tumbler pin hole and rested on a peripheral wall of the lock core or inserted into the second tumbler pin hole, and a control tumbler pin set slidably mounted in the transverse hole and including a transverse tumbler pin rested on the block pin.

Abstract: A handcuff adapted to guide an inserted foreign metal piece upwardly to a blocking portion, and to be quickly put on a wrist of a criminal person is disclosed. The handcuff includes: a movable arm having a ratchet portion formed with teeth; a pair of fixed arms pivotably connected to the movable arm by a pivot pin and integrally provided with rectangular base bodies; a partition plate disposed between the pair of base bodies of the fixed arms, and provided with bilaterally bent protrusions; a pair of frame plates disposed between the fixed arms and the partition plate, and provided with upwardly inclined surfaces and blocking protrusions; a pair of pawl pieces biasedly supported in the pair of frame plates, and provided with teeth to be engaged with the teeth of the movable arm; and a leaf spring received in the pair of frame plates to bias the pair of pawl pieces toward the movable arm. The most proximal teeth of the teeth include slanting surfaces.

Abstract: A lock core mechanism with alarm function in the invention comprises a lock core body having a core plate disposed therein, a projecting rod, a core cover-plate, a housing, an electric circuit plate, a follower member, and an actuating elastic assembly having a contact member and an elastic member. The electric circuit plate will sound when a picking tool is inserted to push the projecting rod downwards to touch against an actuating piece of the electric circuit plate, or when a special tool is inserted to forcedly rotate the follower member to make the elastic member touch against the contact member. The electric circuit plate will not be activated to sound for alarm only when a matching key is inserted to push the projection rod downwards to touch against the actuating piece, and simultaneously turned to rotate the follower member to make the elastic member touch against the contact member.

Abstract: A cylinder lock includes a shell and a plug inside the shell. A locking pin, a sensor pin and a flexible coupling are mounted within the plug. The sensor pin moves the flexible coupling and the coupling moves the locking pin to an unlocked position when the correct key is inserted into a key slot in the plug. The key includes a locking pin receiving notch, to allow the locking pin to move to the unlocked position. The key also includes a contact surface that moves the sensor pin and thereby moves the locking pin to the unlocked position through the flexible coupling. When an incorrect key, without the locking pin receiving notch, is inserted, the flexibility of the flexible coupling allows the sensor pin to move without moving the locking pin. The cylinder lock may also include conventional pin tumblers.

Abstract: A free-wheeling lock assembly includes a case and a drive mechanism which is adapted for coupling to a latching mechanism. The drive mechanism includes a lock barrel supported within the case for rotational and axial movement relative to the case and a driver releasably coupled to the lock barrel but fixed against axial movement. The drive mechanism further includes first and second slidebars supported within the case for axial movement relative to the case. The slidebars are coupled to the lock barrel by tumblers of the lock assembly, and translate the lock barrel axially with respect to the driver, decoupling the driver from the lock barrel in response to rotation of the lock barrel when the tumblers are in a locking position. However, the tumblers permit relative axial movement between the first and second slidebars and the lock barrel when the tumblers are in a releasing position, permitting the lock barrel to rotate the driver for operating the latching mechanism.

Abstract: A lever lock unit includes a housing, a dogging element adapted to actuate a lock bolt, a plurality of lever tumblers that are actuable via the dogging element and movable relative thereto, and a blocking element for blocking movement of the dogging element in the absence of a key or when the wrong key is inserted in the unit. The unit is characterized by a cradle accommodated in the dogging element and adapted to receive the lever tumblers. The dogging element is rotatable and is adapted so that when rotated, the cradle accommodated in the dogging element, and there with also the lever tumblers accomodated in the cradle, will be caused to move linearly in relation to the dogging element and in relation to a key inserted into the unit, for movement of the lever tumblers to a blocking element release position when the correct key is inserted.

Abstract: A multi-layer type lock core structure of a cylindrical lock, having multi-layer and multi-pin design which provides numerous possibility of change and enhances the safety of the lock. There are twelve sets of upper pins and ten sets of lower pins. The upper pins and the lower pins are designed with different levels, wherein the upper pins are designed with different lengths and pushed by the springs and the lower pins so that the upper pins always protrude beyond the surface of the pin ring. Multiple layers of upper pins and pin rings can be disposed, whereby when changing the number of the cylindrical lock, there are over twelve sets of possibility of change so that in case the key misses or is duplicated, the safety of the lock can be still ensured. Therefore, the lock can be more widely applied to various fields. In addition, the fixing spile of the lock is free from any locating hole so that an alien tool has no force application point to pry and damage the lock.

Abstract: Disclosed is an improved cylinder construction for use with a lock system. The cylinder services to frustrate the use of lock picking tools, such as a tensioning device. Specifically, a pair of opposing flat regions are formed at the lower end of the cylinder. Furthermore, the key way formed within the cylinder has an opened lower end. These features make a system which is completely resistant to picking by way of traditional pick tools. Furthermore, the cylinder cannot be broken by way of a screwdriver or drill.

Abstract: A cylinder lock and key combination, wherein the lock comprises a side profile ridge (60) disposed in the key slot (53) and having a relatively shallow recess (61), in which a projection (55) on a side tumbler (54) is vertically movable, and a continuously extending edge portion (62). The key has a relatively shallow coded groove (17), which cooperates with the side tumbler projections (55) of the lock, and a rectilinear, deeper profile groove (16), into which the edge portion (62) of the side profile ridge fits. This unitary edge portion secures a good guidance of the key when the latter is inserted into the lock.

Abstract: A blank for use in fabricating a key for a cylinder lock having a camming projection extending outwardly from a first side of the blade portion of the blank and a recess in the opposite side of the blade portion. The projection and recess are simultaneously formed in a punching operation and have at least one different geometrical parameter whereby the camming projection is not complementary to the recess and/or has a different orientation than the recess.

Abstract: A tamperproof lock includes a housing of a cylindrical construction, and a lock body located in the cylindrical housing. The lock body is rotatably located in the housing such that the lock body can be turned by a key which is inserted thereinto. As the lock body is turned a predetermined angle by the key, the lock body is disengaged with the housing.

Abstract: A pick-resistant lock system including an essentially cylindrical housing with an axial cylindrical bore and a plurality of radial bores spaced along the cylindrical bore and constituting a pin chamber, the radial bores having open ends in communication with the axial bore; a rotatable main cylinder rotatably located within the axial bore, the man cylinder having radial bores alienable with the radial bores of the housing and a planar key way alienable with the radial bores when in the locked orientation; a plurality of pins formed of plural segments positionable within the radial bores of the housing and main cylinder and with springs urging the pins toward the key way, the segments of the pins having interfaces which are alienable with the interface between the bores of the main cylinder and housing; a generally cylindrical facing cylinder axially alienable with the main cylinder and freely rotatable with respect thereto, the facing cylinder having an enlargement matable with a complementary recess in the h

Abstract: A free-wheeling lock assembly includes a free-wheeling lock mechanism which prevents damaging forces from being applied to the components of the lock assembly if the lock cylinder is forcibly rotated by a key other than the proper key or by some other instrument. A detent mechanism, which functions independent of spring bias, couples the sleeve to the case in the presence of the proper key in the keyway. A clutch mechanism couples the cylinder to the driver, but decouples the driver from the cylinder for an over-torque condition. The cylinder lock assembly further includes a locking mechanism which prevents operation of the latching mechanism of the lock assembly if the cylinder is slam-pulled from the case. The tumblers are isolated from rotary motion of the tumbler ward.

Abstract: An improved lock structure, and especially a lock structure in which a stepped shaped wall of the key hole in the lock core can be cooperated with a key to allow the key to be drawn out regardless of its angular position. The lock core can also be rotated from an unlocking position to a locking position without the key; convenience thus is increased. Besides, a plurality of pusher pins are allocated in multiple directions to increase the difficulty of unlocking by a thief, this can thereby increase theft-proof effect.

Abstract: The cylinder lock comprises blocking tumblers which are guided parallel to the broad sides of the key channel. On the broad sides (13, 14) of the flat key (2) guide grooves (15, 16) are disposed which cooperate with carriers on the blocking tumblers. The grooves (15, 16) on the key (2) comprise several function regions, wherein a subregion (51) of the groove comprises an expanded groove width. The tumblers whose carriers engage these expanded groove regions (51) are equipped with additional positioning elements. This configuration prevents the unauthorized opening of a lock according to the invention with a key (2) with duplicated guide grooves (15, 16).

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: The lock bolt has a bolt tip (2) a bolt head (3) whose back wall (4) is intended to rest against a housing pin for sliding this pin into the rotary closure cylinder (24). The bolt tip (2) is supported on the bolt head (3) with a spring engaged between the bolt tip (2) and the bolt head (3) so that it can slide in a limited fashion between an inner and an outer position. The bolt head (3) has a longitudinal bore (5) in which the bolt tip (2) is supported so that it can slide. The lock bolt to a large extent prevents unlocking attempts in which vibrational movements are exerted on the tumblers.

Abstract: A high security lock includes a housing defining an interior chamber having a longitudinal chamber axis and a keyway axially through the housing into the chamber. A cam arrangement within the chamber defines an access in axial alignment with the keyway. The cam arrangement includes a plurality of stationary raceway cams arranged in parallel planes and concentric to the chamber axis. Each raceway cam has a radially-inward surface forming a bearing raceway. The cam arrangement further includes at least one stationary locking cam arranged in a plane parallel to the raceway cams and concentric to the chamber axis. The locking cam has no such bearing raceway. A tumbler assembly is disposed within the chamber and cooperates with the cam arrangement for selective rotational movement within the access about the chamber axis. The tumbler assembly includes a plurality of bearing elements supported for axial movement relative to the cam arrangement.

Abstract: A pick-resistant lock system including an essentially cylindrical housing with an axial cylindrical bore and a plurality of radial bores spaced along the cylindrical bore and constituting a pin chamber, the radial bores having open ends in communication with the axial bore; a rotatable main cylinder rotatably located within the axial bore, the man cylinder having radial bores alignable with the radial bores of the housing and a planar key way alignable with the radial bores when in the locked orientations; a plurality of pins formed of plural segments positionable within the radial bores of the housing and main cylinder and with springs urging the pins toward the key way, the segments of the pins having interfaces which are alignable with the interface between the bores of the main cylinder and housing; a generally cylindrical facing cylinder axially alignable with the main cylinder and freely rotatable with respect thereto, the facing cylinder having an enlargement matable with a complementary recess in the

Abstract: A theft detection mechanism is provided with a top ring which is depressed when a foreign object other than a key is inserted into a key inserting hole. A sensor is provided for detecting that the top ring is depressed. A top ring is inevitably pushed down when a foreign object other than a key is inserted into a key inserting hole to activate the sensor, thereby reliably detecting a stealing action. Moreover, the structure of a theft detection mechanism is made simple to reduce the cost thereof.

Abstract: A lock includes a casing, a cylindrical rod and a key, the casing having a longitudinal hole for the cylindrical rod received therein. The casing and the cylindrical rod have a main transverse hole device defined radially respectively therein and are in alignment with each other for receiving a main pin device therein, the cylindrical rod having a key hole defined longitudinally therein, at least one offset transverse hole device defined between the key hole and the main transverse hole device which is parallel to the offset transverse hole device so as to communicate with the main transverse hole device and the key hole, the offset transverse hole device having an offset pin device received therein, the offset pin device being lifted by a movement of the key inserted in the key hole to operate the main pin device to open the lock.

Abstract: A lock insert with at least one revolving operating projection (1) for the lock pawl includes a first locking system (2) for axial contact with the frontal end (3) of the key (4) and a second locking system (10) for radial contact with the key (4). The first locking system (2) is formed by a blocking liner (7) with a bottom (5) with an axial carrier cavity (6) for the frontal end (3) of the key (4), and is provided on the outside with at least one operating projection (1) and in its housing with at least one radial opening (8) with a distance element (9) placed therein. The second locking system (10) is formed by a hollow unrevolving liner (11) coaxially enclosing on the outside and on the inside the blocking liner (7) and is provided with radially slidable elevation structures (12) for each distance element (9).

Abstract: A cylinder lock and key combination, wherein the lock comprises a side profile ridge (60) disposed in the key slot (53) and having a relatively shallow recess (61), in which a projection (55) on a side tumbler (54) is vertically movable, and a continuously extending edge portion (62). The key has a relatively shallow coded groove (17), which cooperates with the side tumbler projections (55) of the lock, and a rectilinear, deeper profile groove (16), into which the edge portion (62) of the side profile ridge fits. This unitary edge portion secures a good guidance of the key when the latter is inserted into the lock.

Abstract: A protector block is constructed so as to be urged in a key extracting direction and movable in a key inserting direction and is provided with radially outwardly projecting engaging portions which come into engagement with an outer lock cylinder when the protector block is pushed in. The overall length in the key inserting direction of the protector block can be shortened and hence it is possible to construct a handle locking device in a compact shape. Further, in the case where the protector block is fabricated by sintering, the green compact density in powder molding can be made more uniform because it is possible to shorten the length in the key inserting direction.

Abstract: A tumbler assembly for a key operable locking mechanism (hereinafter referred to as a "key mechanism"), includes support means (12) and a plurality of tumblers (14) mounted in the support means. The assembly, suitably orientated relative to a three-axis co-ordinate system for which it is appropriate to designate the axes as being vertical, lateral and horizontal, has tumblers (14) mounted in the support means (12) in a random or sequential series which extends longitudinally in the support means. The tumblers (14) are mounted for movement to and away from a respective active position by substantially linear movement. The support means has first (14a) and second (14b) laterally opposite sides, with each tumbler accessible at each of those sides. Each of the tumblers (14) is configured at the first side (14a) for effecting its movement by engagement with a configured key blade of a suitable key presented longitudinally (20) along the first side (14a).

Abstract: A key having profile features which include a shaped indentation on a first side of the blade and an aligned projection on the opposite side of the blade cooperates with a cylinder lock with unauthorized key trapping capability. The lock has an auxiliary locking pin which cooperates with the key indentation and a movable plate member which cooperates with the key projection. Both the indentation and projection must be present and properly sized and shaped for a properly bitted key to operate the lock.

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.