Abstract: An apparatus which inhibits the theft of equipment such as personal computers is disclosed. The equipment must have an external wall provided with a specially designed, approximately rectangular slot having preselected dimensions. An attachment mechanism includes a housing for a spindle having a first portion rotatable within the housing, a shaft extending outwardly from the housing, and a crossmember at the end of the shaft having peripheral dimensions closely conforming to the internal dimensions of the slot. An abutment mechanism also emanates from the housing, and is located on opposite sides of the shaft intermediate the housing and the crossmember. The peripheral cross-sectional dimensions of the abutment mechanism and the shaft in combination closely conform to the dimensions of the slot. The length of the shaft from the housing to the crossmember is approximately equal to the thickness of the external wall of equipment.

Abstract: A locking mechanism is provided which is characterized by one or more blocking elements each consisting of two complementary semi-cylindrical parts (2),(3) snugly located in a correspondingly shaped aperture (4) defined between two relatively movable parts (5),(6) to be locked together, one of the semi-cylindrical parts (2),(3) being adapted to be operatively coupled to a key (8) to permit rotation of the two complementary semi-cylindrical parts (2),(3), whereby the two semi-cylindrical parts (2),(3) can be rotated between a position in which they prevent movement of the two lock parts (5),(6) and a position in which the two lock parts (5),(6) are relatively movable.

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 flat lock set has a flat lock having a cylinder, a tumbler, several rings and springs and a key having several stepped blades each having several shoulders. The cylinder is mounted in a door and has four groups of ribs formed therein. Each group includes several separate ribs defining several passages extending perpendicular to a length of the cylinder. The cylinder has a first end defining a first opening and a second end integrating with a ring defining a second opening. The tumbler has a disk integrating with a key receiver integrating with a latch carrier. The key carrier is separated into several prongs. The rings each have two ears formed along an outer rim thereof and several arms formed along an inner rim thereof. When the rings and springs are alternatively mounted on the first sections of the prongs, the arms formed on the rings are sited between the prongs.

Abstract: An axial pin tubular lock for use in securing portable computers and other devices having spindle-accepting ports. The lock is bade up of an outer shell attached to a cable, an inner shell, a rotatable driver sleeve, a stationary tumbler sleeve, a rear scuff plate held in place by a combination of an adhesive and cooperative geometric engagement with the outer shell, a locking spindle extending through the driver and tumbler sleeves, a retaining plate and an anti-rotation extension which may be integrally formed with the retaining plate. The rotatable driver sleeve is equipped with an internally disposed detent which engage a groove on the spindle, thereby providing proper axial and radial alignment between the spindle and the driver sleeve. The internal surface of the stationary tumbler sleeve has an indented support surface, thus providing spindle support while permitting passage of the spindle head through the tumbler sleeve during assembly.

Abstract: A cylindrical key operated variable code lock provides a shell having a cylindrical inner surface and an orifice for accepting a key. The key may be generally cylindrical in shape carrying a number of lugs thereon that are rotationally variable. The drum is normally rotationally fixed relative to the shell by a plurality of locking elements. In response to the insertion of a key having a predetermined code each of the locking elements, conversely, allow the rotation of the drum relative to the shell. The locking elements may be reconfigured in response to a predetermined varying of the key code. The reconfiguration may particularly entail the turning of the unlocked drum to a predetermined position and removing the key while the locking elements are in a state allowing recoding.

Abstract: A door latch comprises a post and collar gripping and release mechanism cooperatively mounted to the door and door frame of a vending machine, cabinet, or the like, to provide an initial latching function in the form of a frictional gripping of the post by the collar, and further comprises a lock assembly associated with the post and collar mechanism to provide a primary locking function and to effect release of the latching function.

Abstract: A lock device includes a hollow cylindrical rod body with two retaining holes. The rod body has a closed end and an open end. A key plug assembly includes a tubular outer housing fixed in the open end of the rod body, and a push rod extending through the outer housing and movable in the outer housing between an unlocking position, where a portion of the push rod extends from the outer end of the outer housing, and a locking position, where the push rod extends from the inner end of the outer housing. In the rod body, a resilient element pushes a locking plate assembly toward the key plug assembly. When the push rod is pushed inward and is locked in the locking position in the outer housing, the resilient element is compressed between the locking plate assembly and the end wall of the rod body so that two notched lock bars extend through the retaining holes and the small-sized portions of the locking holes in the locking plate assembly, thereby preventing removal of the lock bars from the rod body.

Abstract: A master tubular key co-operating with a conventional lock having a tumbler consisting of a first section rotating in the lock and having a first group of tunnels through which a group of first pins being different in length are received and a second section being fixed in the lock and having a second group of tunnels corresponding to the first group of tunnels and receiving springs and a group of second pins is disclosed. The master key has a group of springs which are much stronger than those in the lock and a plurality of strips. The springs urge the strips to force the group of first pins to keep the group of second pins completely in and the group of first pins completely off the second group of tunnels, thereby allowing the first section to rotate relative to the second section.

Abstract: A cylindrical lock core is provided having a first plug member with a cross-shaped keyway, four blind holes formed in a lower portion thereof, and a flange at top portion having a projection extending downwardly therefrom. A second plug member is located underneath the first plug member. The second plug member also has a cross-shaped keyway, includes four through holes and a projection extending from one side thereof. The second plug member also has a plurality of setting walls disposed between each aperture of the keyway and each through hole. Each of the through holes is terminated by a small aperture disposed at the bottom end thereof. A plurality of springs are positioned in the blind holes and on each rests a first tumbler pin, each of which has a portion disposed in the first plug member and a remaining portion disposed within the second plug member, which also contains a second tumbler pin in axial alignment. A barrel is provided for receipt of the plug members.

Abstract: A cylinder lock includes a tubular housing in which a fixed hollow cylinder and a rotatable hollow cylinder are coaxially mounted. Several axial bores are formed in an end surface of the fixed hollow cylinder. The rotatable hollow cylinder also has several axial bores formed therethrough. Several tumbler units are received in the bores of the cylinders. Each of the tumbler units consists of a first tumbler pin, a second tumbler pin and a tumbler spring. A locking bar extends through the cylinders. A guide pin is mounted securely on the rotatable hollow cylinder and received slidably in the axially extending slide slot of the locking bar so as to enable synchronous rotation and relative sliding movement of the rotatable hollow cylinder and the locking bar. The engagement of the guide pin in the slide slot retains the locking bar on the lock. A resilient element biases the actuated end of the locking bar to extend from the housing. A spring-loaded retaining element is disposed on the fixed hollow cylinder.

Abstract: A barrel lock includes a circumferential axial pin tumbler arrangement housed in the barrel. A removable pilot post is disposed among the tumblers and has key-guides which register with mating key-guides on an actuating key. To change the lock combination, the lock can be reassembled with the pilot post located in a new rotational orientation relative to the tumbler arrangement. A particular application includes locking merchandise compartments in vending machines, for example.

Abstract: A door latch comprises a post and collar gripping and release mechanism cooperatively mounted to the door and door frame of a vending machine, cabinet, or the like, to provide an initial latching function in the form of a frictional gripping of the post by the collar, and further comprises a lock assembly associated with the post and collar mechanism to provide a primary locking function and to effect release of the latching function.

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 eccentric 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. The key comprises a flattened key handle and a cylindrical portion.

Abstract: A lock assembly includes a lock body having a hole longitudinally therethrough, a plunger arranged longitudinally in the hole, a single strong spring coiled around the plunger and arranged longitudinally in the hole inside the lock body for returning the plunger to an open position, a key for turning the plunger to a closed position, and a plate for receiving the plunger in the closed position. A hole in the head portion of the plunger and a hollowed end of the key have matching hexagonal cross-sections for engagement with each other. A first roll pin is seated in the hole in the head portion and guides the hollowed end of the key into the hole. A second roll pin is inserted crossways into another hole in a middle body portion of the plunger for retaining the plunger in the open position.

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 includes a cylindrical housing connected with a circular insert at its bottom to receive therein a movable barrel and a fixed barrel. A plurality of lock pin assemblies are set in a plurality of pin holes vertically through the movable lock barrel to control the connection of the movable lock barrel with the fixed lock barrel by use of the various stepped pins of an authorized key. The stepped pins can be detached from the key for keeping separately.

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: A sleeve-type latch bolt mechanism includes: a cylindrical body with an annular member and a check block formed at one end, a round keyhole in the middle, a plurality of vertical grooves and slots positioned along the cylindrical body in communication with the round keyhole; a latch device composed of a plurality of front and rear latch members, each with a reference slot and a plurality of dummy slots in one side and a check piece in another side, respectively, disposed in the vertical grooves of the cylindrical body with the check pieces extending into the round keyhole; a plurality of different circular positioning members each with a plurality of check lugs separately disposed around the cylindrical body; a front and a rear sleeve member installed around the outside of the cylindrical body and engaged with the circular positioning members; and a cylindrical-stem key having a stem provided with a plurality of different slots or step-type strips therearound in conjunction with the locations of the check pie

Abstract: A cylinder lock includes a cylindrical shell housing a core assembly which is locked against rotation relative to the shell by means of axial locking pieces and radial tumbler pins. The locking pieces move to their unlocking positions when the outer peripheral grooves thereof are aligned circumferentially with the outer peripheral grooves of the core assembly. The inner distal end of the locking pieces does not extend into an axial central bore of the core assembly, thereby minimizing the risk of the lock being picked by an intruder.

Abstract: An improved axial split pin tumbler type lock is provided. The improvement consists in providing a cylinder having a lock head formed with a square-shaped keyhole defining a front face on the lock head, and a three-part plug assembly inserted in the cylinder. One of the three-part plug assemblies consists of a cylinder head having a forward end provided with a square-shaped cut-out section formed therein, the square cut-out section radially traversing the tumbler bores formed therein. A tubular key is provided having an inner circular core, and an outer square-shaped face adapted to matingly engage within the square-shaped keyhole in the lock head and the square-shaped cut-out section in the cylindrical head portion. The square-shaped front face of the lock head includes a series of thickened face sections alternating with a series of thinner face sections.

Abstract: A tubular key and mating latch-actuator are provided in which the key has inner circumferential recesses and the latch-actuator has a stud having projections therefrom, the recesses and stud projections being arranged according to a binary-code so that each key of a series is unique.

Abstract: The improved lock core comprises a cylindrical casing receiving a rotatable spindle formed with a co-rotatable outer ring through which upper plug followers extend, biased by lower plug followers received in a lower plug non-rotatably secured to the casing with a lock pin. A pair of protuberances are formed closely adjacent each other on an upper surface of an outer ring to receive a tenon of a valid key inserted through a key hole in the cylindrical casing. The protuberances enable the key to apply rotative torque to the outer ring while a front edge of the key depresses the upper plug followers a sufficient depth enabling the outer ring and spindle to rotate relative to the lower plug.

Abstract: An axial tumbler pin lock that includes an inner cylindrical body and a pair of abutting, coaxially positioned first and second inner sleeves that are rotatably carried on the cylindrical body and are capable of relative rotation with respect to each other and with respect to the cylindrical inner body. The cylindrical inner body includes a stepped portion that abuts an inner sleeve to define a transversely extending locking plane. The respective abutting faces of the second inner sleeve and the inner cylindrical body define a transversely extending first reset plane, and the abutting faces of the first rotatable sleeve and the second rotatable sleeve define a transversely extending second reset plane.

Abstract: A tubular key and axial pin tumbler lock construciton with an annular keyway wherein the key shank has a plurality of longitudinally extending grooves positioned between the circumferential key cut receiving areas and the lock housing outer periphery of the key entry way is provided with corresponding shaped projections which allow the tubular key containing the grooves to pass into the entry way. The tubular key shank also includes a transverse annular recess spaced inwardly from the forward end of the key such that when the key is inserted to its lock operating position, the key grooves and housing projections are free of one another to allow the key to rotate within the lock.The tubular key construction can be utilized with conventional existing tubular lock constructions and the key grooves and housing entry projections may be varied in shape or locations so that they are combinated to permit only certain or select keys to be used with a certain lock or groupings of locks.

Abstract: A padlock and key assembly includes a padlock and a cylindrical key. The padlock includes a lock body, and a key plug which is locked in the lock body by transversely movable tumbler units and vertically movable tumbler plate units. The key includes annular grooves formed in its outer surface, and push blocks extending radially from the key. When the key is inserted into the key plug, the annular grooves engage with the tumbler pin units and the push blocks engage with the tumbler plate units so that the key plug is unlocked from the lock body, thereby enabling the key plug to rotate with the key.

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: An improved cylindrical key comprising a key plate having two small fixing protrusions and a leg-shaped extension plate formed at one-side end portion thereof, and a key cylinder having a greater cylinder section provided with a radial elongated hole for receiving said leg-shaped extension plate, a smaller cylinder section provided with a cross slot arranged in alignment with said radial elongated hole for engagement of said side end portion of said key plate, and a communicating with the inner step bore of said cylinder sections for firmly securing said two fixing protrusions when the latter are inserted into said inner step bore through said cross slot, and outwardly bent and rested on the inner step slope wall of said inner step bore.

Abstract: An improved, highly pick-resistant tumbler lock construction incorporates at least one of the rear face of the driver sleeve or the front face of the tumbler sleeve with a plurality of notches. Each notch surrounds a driver or tumbler axial bore so as to provide at the trough of the notch a false shear plane while the crest of the notch portion of the tumbler and driver sleeve forms a plane to fixedly support two relatively thin discs which form the true shear plane. The discs include annularly spaced bores corresponding to the tumbler and driver sleeve bores. Thus when attempting to pick the lock, and the driver and tumbler pins are at the notched false shear plane, the driver sleeve will not be able to turn because the pins will be caught in the lower part of the notch.

Abstract: An improved tubular axial wafer tumbler lock that can be fully automatically manufactured and assembled along with a cast combinated key at very low cost without machining operations is made up of three basic components including a shell, spindle plug and rear cap wherein generally T-shaped wafer tumblers are held in open notches in the spindle plug by springs and a multi-purpose cam stop washer at the forward end retains the tumblers in the plug during assembly and after assembly conceals the outside readability of the tumbler lock-up combinations as well as defining the rotational limits of travel of the sprindle plug. A lockup of the lock is accomplished with forward and rearward notches tha co-act with radial blade portions of the tumblers and the notches are disposed at 15.degree. increments which thereby provide 24 of such notches to permit a large variety of different key pulls.

Abstract: The invention concerns a locking device consisting of a key and of a lock. Inside the lock is a shaft (1) that has at least two diametrically opposed cams (4 & 5 ) mounted on it. The key can be positioned against one end (2) of the shaft in such a way that it cannot rotate in relation thereto. Inside the body (6) of the lock are blocking or barricading elements (9 & 10) that can slide or pivot radially in the unbarricaded state and that are subject to springs (40) that force them radially inward. The blocking elements are barricaded by means of several blocking pins (11) that block the sliding blocking elements or operate in conjunction with them by means of special blocking extensions on them to provide a blocking action. The blocking pins are subject to spring (12 or 60) that force them into the blocking position.