Abstract: A lock cylinder which can be actuated from one side by a knob and from the opposite side by a key, has a locking-member hub and a cylinder core which has tumblers adapted to be positioned by the key. A free passage is provided between a coupling member and a locking-member hub so that the coupling member entrains the locking-member hub only in one direction of rotation and can be freely turned back from the entrainment end position.

Abstract: A combinating tumbler lock featuring zero clearance between the lock plug and mounting shell including: a mounting shell having a central throughbore with a front section having a first, greater diameter and including longitudinal locking grooves, a rear section having a second smaller diameter and including longitudinal stopping grooves, and a tapered transition section between the front and rear sections; a lock plug for selective rotation within the mounting shell and having three sections corresponding in diameter to the sections in the mounting shell, the lock plug front section including a tumbler receiving opening, the lock plug rear section including a cam-receiving structure and a first radial throughbore, the lock plug also including a second radial throughbore between the front section and the tapered section; a tumbler disposed in the lock plug for selective engagement with the longitudinal locking grooves of the shell; a spring loaded stop comprising two spherical balls actuated by a compression

Abstract: A burglar proof lock for instance for a door, trunk lid, ignition switch, steering column, etc. of a motor car and of the type which is formed with a rotatable lock cylinder comprising several latch plates which in a predetermined order become partly expelled in the radial direction from the lock cylinder when the key is removed from the lock cylinder. In the expelled position, the lock plates lockingly engage a latch sleeve formed with several inner, annular grooves adapted to receive the latch plates of the lock cylinder in the locked condition of the lock. The lock cylinder can rotate freely in the latch sleeve but can not be moved axially in relation to said latch sleeve in such locked condition.

Abstract: A cylinder lock is disclosed having significant resistance to damage or tampering. The cylinder lock comprises a cam provided on the key cylinder; and a pair of pins disposed radially slidably in openings provided in the sleeve rotatably disposed within a casing. The pins are moved within the openings of the sleeve by the cam on the key cylinder which is rotatably positioned within the sleeve when the key cylinder is turned by a proper key independently of the sleeve to a predetermined angle, as tumblers provided within the key cylinder are disengaged from the sleeve. Then, the pin comes into engagement with and is rotated with the connector together to unlock the lock device.

Abstract: A cylindrical lock assembly (20) includes an inside subassembly (22) and an outside subassembly (24) which are assembled with a door (326). Each subassembly (22,24) includes a rose liner (26,38), a return spring cassette (28,40), a rose (30,42), a lever (32,46) and a lever insert (34,48). The inside subassembly (22) also includes a turn button (36) and the outside subassembly (24) includes a cylinder lock (44).Cylinder lock (44) includes a plug (114) within a shell (112). A rib (122) for supporting tumbler pins (428) is formed with the shell. An identifier actuator (456) is depressed by a tailpiece (116) when a turn button (36) is operated to lock the assembly (20). When the actuator (456) is depressed, an identifier pin (436) is moved within the plug (114) and extends partially from the front of the plug to signify that the assembly (20) has been locked from the inside.

Abstract: A cylinder lock is disclosed having significant resistance to damage or tampering. The cylinder lock comprises an axial cam provided on the key cylinder; a rotator which may be engaged with the sleeve and be in contact with the axial cam of the key cylinder; a stopper positioned adjacent to the rotator and having a pair of lugs engageable with a recess of the casing; and an axial spring positioned between the stopper and a connector for resiliently urging the stopper toward the rotator. The rotator and stopper are axially moved by the axial cam of the key cylinder to release engagement of the rotator with the sleeve and also to release engagement of the stopper with the casing when the key cylinder is rotated independently of the sleeve by a correct key, thereby the rotator comes into engagement with the connector. By further rotating the key cylinder, the rotator, stopper and connector are rotated as a unit to a locked or unlocked position.

Abstract: A cylinder lock for use in motor vehicles and elsewhere has a case for a rotatable and axially movable sleeve-like guide which receives a rotatable cylinder having a keyhole and being locked to the guide by tumblers when the key is withdrawn. A detent is installed between the case and the guide to normally prevent rotation of the guide except when the guide is acted upon by a large force which causes it to deactivate the detent as a result of certain axial movement of the guide and cylinder in the case. A clutch between the cylinder and a motion transmitting element for a bolt of the lock is engaged as long as the detent is operative but is disengaged not later than when the detent permits the guide to turn in the case.

Abstract: A lock is disclosed which includes a housing having an inside bore, a cylinder selected from a group consisting of interchangeable core cylinders and insert cylinders, the cylinder having an outer contour, the inside bore of the housing being at least as large at any point as the outer contour of the cylinder, and a device for adapting the inside bore of the housing to correspond to the outer contour of the cylinder. Also described is a transmission assembly mounted to the housing and cooperating with the cylinder to impart desired motion to a latch mechanism of the lock. An advantage of the lock is that it may accommodate distinctively different cylinder types with different form, fit and function.

Abstract: A tamper resistant pop-handle lock is disposed in the door of a vending machine or similar closure, and is used to restrict operation of a spring-biased handle which is seated in a recessed housing and is adapted for manually latching and unlatching the door. The lock has a cylindrical barrel and a rotatable key plug mounted within an opening in the barrel. An axially extending eccentric lug at the inner end of the plug is received in a recess formed on a retractable locking bolt, such that rotation of the plug relative to the barrel causes the locking bolt to move through a second opening in the barrel. A locking surface on the lug-receiving recess engages the eccentric lug when the key plug is in a locked position to prevent radial movement of the bolt and extension of the handle.

Abstract: A locking device for an auxiliary lock comprising a safety button able to be pressed in and a rotating ring to be rotated to actuate the dead lock to be extended for locking the lock.

Abstract: A door locking mechanism for a door assembly of the type having a door frame and a door mounted for pivotable movement between an opened and closed position with respect to the door frame, includes key-operated cylinder locks mountable on opposite sides of the door, the cylinder locks each having a tailpiece rotatable between a locking and unlocking position via key operation thereof. A bolt is mountable on the door and frame for locking the door in the frame when the door is in its closed position, the bolt being reciprocably movable between a locking and unlocking position. A lever is coupled to the bolt for reciprocably moving the bolt between the locking and unlocking positions thereof.

Abstract: The lock cylinder with an external housing accommodates, on its rear face, a closure element acting upon a mortise lock or the like and with an exchangeably inserted core unit the casing of which contains housing pins as tumblers and a cylinder core equipped with a key channel, said cylinder core also receiving core pins as tumblers and being connected merely in a plug-in manner to coupling pins which issue from said closure element and project freely into a socket in said external housing serving for insertion of said core unit, wherein engagement of said coupling pins extends only over a rear region, which is free from key channels, of said cylinder core.

Abstract: A shackle lock, particularly with a long shackle, comprises a lock body and a lock shackle with two shackle arms, the free end portions of which are displaceable into a shackle arm housing of the lock body until they reach a locking position of the lock shackle. A lock mechanism is rotatable about an axis of rotation, particularly by a key. Disposed in the lock body is at least one locking element which meshes with the closure mechanism and which, upon actuation of the closure mechanism, is guided for movement out of a lock shackle arresting position in which the locking element is in engagement with the end portion of at least one shackle arm for locking the lock shackle and for movement into a lock shackle releasing position in which the locking element is out of arresting engagement with the end portion of the shackle arm. In this lock shackle releasing position the shackle arm can be withdrawn completely from the shackle arm housing.

Abstract: A locking device for an auxiliary lock comprising a rotatable ring, able to be rotated at the outside of a lock to turn an actuating wheel 90.degree., said actuating wheel having an 8-shaped opening for an actuating plate of the dead bolt to pass through so that the actuating plate can be turned 90.degree. to extend the dead bolt latch out to lock a door.

Abstract: A padlock with removable cylinder mechanism offers the user a choice of two distinct manners of operation or "functions"--a Key Retaining function and a Non-Key Retaining function. This dual function capability in a single unit is achieved by a rotator bolt bored to allow placement of a pattern of pins. A series of pins, which when installed in the rotator bolt in a specified pattern, causes the function selection to be accomplished. A re-keyable padlock which accepts widely available, standard dimensioned, generic key operated lock cylinders allowing the keying of this padlock to be adapted to the wide range of keying systems used in locks found in residential, commercial and other uses as required for security and convenience. The use of standard dimensioned cylinders in the padlock is accomplished by a cylinder retainer, tailpiece stop and rotator bolt which adapts the generic cylinder to padlock use.

Abstract: A retrofit knob cylinder has a cross-shaped slot on the rear of the cylinder plug and a cross-shaped opening through a plug retainer so that a number of different tail pieces may be assembled to the plug and extend through the opening and may be positioned either horizontally or vertically depending on which portion of the cross slot they are assembled in.

Abstract: A cam lock having an adjustable cam bolt. The cam lock has a tubular lock case, a tumbler, a shaft, a spring, and a cam bolt. The tubular lock case has an inner flange which divides the lock case into a first portion and a second portion which is formed with a restricting element. The tumbler is received in the first portion. The shaft is rotated by the tumbler and extends into the second portion. The spring is disposed around the shaft within the second portion. The cam bolt is mounted on the shaft by threaded engagement so as to compress the spring and has an arc-like cutoff beyond which the restricting element extends.

Abstract: A locking device for an auxiliary lock comprising a rotatable ring provided with inner teeth around the inner peripheral surface and a traditional lock additionally provided with a lateral hole to fit a spring and a steel ball pushed by the spring therein, the ball extending a little out of the lateral hole to engage with the inner teeth in the rotatable ring, the inner teeth being able to be felt surely to slide over the ball when the rotatable ring is rotated.

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

Abstract: An automobile steering wheel lock consists of an elongated tube member, a housing, an elongated rod member and a lock mechanism. The improvement of the automobile steering wheel lock is in the lock mechanism which is inserted in a lower chamber of the housing. The lock mechanism is combined by a locking member, a sleeve, a bearing member and an actuator. The sleeve defining a hollow cylinder has a bottom groove mounted by a projection of the locking member. The bearing member having a bottom cylindrical projection retained by a powerful spring is capable of passing through the sleeve and being inserted in a central circular groove of the projection of the locking member.

Abstract: A lock mechanism comprises a housing and a rotor mounted within a bore of the housing having a skirt, the rotor and skirt being rotatable by a knob. A lock opening and closing lever is rotatable between locking and unlocking positions and a rod is drivably connected to the lock opening and closing lever and serves for connection to a latching device.A securing and release lever drivably connected with the rotor through a drive tang and a slot permitting lost motion is movable by an actuator independently of the rotor.

Abstract: A high security post lock according to the invention includes a hardened shell having a head member at one end thereof and an eccentric locking cam rotatably mounted at the other end. The lock is adapted to be inserted through an opening passing through a door frame and a door to secure the door. In a first or open position, the circumference of the cam is coextensive with the circumference of the shell, so that the lock can be inserted into and withdrawn from the door. In a second or locked position, the locking cam projects outwardly from the shell to prevent withdrawal of the lock and thus secure the door. Movement of the cam is limited by a pin and groove arrangement.

Abstract: A locking device for an auxiliary lock comprising a rotatable ring and a base. The ring is fitted around the auxiliary lock and combined with the base. Then they are mounted in the door to let a large part of the rotatable ring be exposed outside the door, and rotating the ring can cause the dead bolt of the auxiliary lock to extend out locking the lock.

Abstract: The present invention relates to a lock (3) on the inside of a door, wherein the lock can be actuated from outside the door. The lock is connected to a locking device (14) on the outer side of the door by a coupling rod (12). In order to increase protection against burglaries, the coupling rod (12) is to pass through a channel (22) with which a channel closure jaw (28) is associated. The jaw is supported on the coupling rod (12) and is under spring-load in the direction of closure. Removal of the coupling rod during a burglary attempt results in a closure of the channel with protection of the lock from tampering by the jaw.

Abstract: A lock cylinder having a cylinder housing in which a cylinder core is rotatably disposed and which can be locked with the cylinder housing via spring-loaded tumblers upon the withdrawal of a key from a key duct of the cylinder core. A bearing sleeve encloses the cylinder housing and the cylinder housing is rotationally fixed by means of an overload coupling in this bearing sleeve. A rotary connecting element, arranged behind the lock cylinder, leads to a locking mechanism which and can be connected with the cylinder core by a separating coupling. The lock cylinder, while maintaining its overload protection, becomes suitable for the rotational control of a locking mechanism which is arranged separately of the lock cylinder.

Abstract: A lock of the disconnectable rotor type comprises a rotor rotatable in a stator sleeve rotatable in a fixed lock case. Locking means (e.g. pairs of pins or pallets) cooperate with rotor and stator sleeve to couple them together for simultaneous rotation in the absence of a correct key while freeing the rotor from the stator sleeve when the correct key is introduced. The stator sleeve is maintained in a normal or "rest" position by an effaceable indexing member. The indexing member cooperates with the lock case to maintain the stator sleeve in its said position. A lock bolt actuating lever is coupled to the rotor by coupling means such as to effect this coupling only after rotation of the rotor independently of the stator sleeve. The coupling means include a slide ring rotatable with the rotor, cooperating with the stator sleeve through camming means to slide the slide ring axially, and including at least one actuating finger.

Abstract: A pop-out handle lock assembly wherein the handle engagement and connecting means is a two part construction including a rotatable shaft having a head end with a transverse slot and a generally T-shaped holder member made of flat sheet material is pivotally held in the slotted head end of the shaft so as to eliminate binding or interference with the freedom of the handle to pop out or to be pushed into the locked retracted position.

Abstract: A lock has a drive member which is moved to actuate the lock. A plurality of elongate members are connected to the drive member, one end of each elongate member being inserted in a respective spring-biased plunger. A first contoured element locates the plungers in position. An appropriate key must be inserted with a contoured surface in contact with a second set of plungers to align passages in the second set of plungers with the ends of the elongate members to enable the elongate members to move, thus permitting the lock to be opened.

Abstract: A combination door latch and deadbolt assembly includes an improved latch mechanism and deadbolt mechanism designed for use with doors having a variety of standard size backset and cross bore dimensions. The latch and deadbolt mechanisms are carried by escutcheons havings breakaway tabs at varying diametric positions to fit securely within door cross bores of different standard sizes. The latch mechanism further includes an improved mounting arrangement for left- or right-hand mounting and positive centering of lever-type door handles, together with a simplified cam-actuated latch retractor. The deadbolt mechanism includes an improved bolt linkage which provides a desired bolt throw when a relatively small door backset and/or cross bore size is used. The deadbolt mechanism further includes an improved thumb turn rotatable through ninety degrees between orientations representative of deadbolt position.

Abstract: An electronic lock that is equipped to work together with a key equipped with a number of programmable memories, the said lock comprising an activation element, a dormant memory which contains a code, and comparison means to successively compare the said code contained in the dormant memory with the codes contained in the programmable memories of the key, characterized by the fact that it comprises means of engagement between the key and the activation element, an electromagnet equipped to control the said means of engagement as soon as the comparison means have recognized that the code of the key and the code of the lock are identical, and locking means to maintain the means of engagement in the engaged position until the key is withdrawn from the lock.

Abstract: In a burglarproof system for an automotive vehicle, a door key cylinder arranged at a vehicle door includes a cylindrical body and a rotor accommodated therein. An acting section provided at the rotor extends radially from an axis thereof. A door key switch arranged in the vicinity of the door key cylinder detects the acting section to output a key-operation detection signal, when the rotor is angularly moved by turning operation of a key to bring a door locking mechanism to an unlocked position. A door lock switch detects in which one of the locked and unlocked positions the locking mechanism is. A stealing detector is provided for outputting a stealing detection signal when the stealing detector does not receive the key-operation detection signal from the door key switch, but receives the lock-releasing detection signal from the door lock switch. A burglarproof unit executes operation for a burglarproof in response to the stealing detection signal.

Abstract: A combination switch lock/cam lock assembly which includes a one-piece shell, a plug with a tenon, an electrical switch, and a cam is insertable from the front face of a panel opening by not affixing the cam until after the lock is inserted. After the lock is inserted in the panel and secured by a panel nut, the cam is installed by insertion through a slot in the shell to engage and be rotated by the tenon, and a spring-like retainer carried by the cam grips the tenon to retain the cam on the tenon and prevent the cam from being easily removed from the shell.

Abstract: A lock of the type having a locking function released by a coin drop is disclosed. The lock includes a lock box housing which carries a locking cylinder and a shiftable operating element. A separate support casing is mounted on a door and carries a reversible latch element having two heads and an open box-like frame. The frame is provided with two openings for receiving the operating element. A separate spring-loaded slide is provided for urging the latching element in a forward locking direction.

Abstract: A bar lock comprising two toothed plates (1) and (2) and a rotatable cross element (3) which transmits movement to said plates. The cross element (3) is operated by two mechanisms, one internal and one external, which act independently of each other; the internal mechanism is composed of elements which are specular to the elements of the external mechanism. Each of said mechanisms comprises the following elements: a recess (25) provided in the base plate (18) and in the counter-plate (12) respectively; a rotary element (5) rotatable within said recess, the rotary element having a seat for entraining a roller (6) and having engagement means for engaging a tang of a cylinder or knob; a disc (7) rotatable with the cross element (3) and having notches (26) and (27); a slider (9) maintained in contact with the cross element by a spring (10) fixed to a spring-guide block (14).

Abstract: A lock cylinder for use with either a deadbolt lock or a key-in-the-knob lock. The lock cylinder includes a hollow cylindrical body having a radially projecting, pin-containing chamber, extending along the length of the body, and a cylinder plug rotatably accommodated within the body. The plug holds a series of pins, which can be brought into alignment with the pins in the chamber, and the plug has a slot for accepting a key. Two tailpieces are provided, either of which may be alternatively secured to the cylinder plug in non-rotatable relationship to the plug. One of the tailpieces is cooperable with the mechanism for operating a deadbolt lock, and the other tailpiece is cooperable with the mechanism for operating a key-in-the-knob lock. One end of the cylinder plug is formed with a transverse slot and an annular slot, an extension at one end of each tailpiece fitting into the transverse slot, and a resilient snap ring fitting into the annular slot to prevent separation of the tailpiece from the plug.

Abstract: An actuating structure is provided for a lock having a barrel with a plug which is key-actuated for rotation therein, and a switch having a shaft and rotor rotatable with the plug. A first lug is fixed relative to the barrel and a second lug rotates with the plug. A first stop washer is provided having two slots therein, one slot receiving the first lug to allow limited rotation of the first washer relative to the barrel and the other slot receiving the second lug to allow limited rotation of the first washer relative to the plug. A second stop washer is also provided having two slots therein, one of the slots receiving the first lug to allow limited rotation of the second washer relative to the barrel and the other slot receiving the second lug to allow limited rotation of the second washer relative to the plug. A spring is provided to rotationally bias the stop washers in opposite directions.

Abstract: A door locking mechanism enclosed within a casing for locking a door to its door frame. The door lock includes at least one bolt displaceable inside the casing through a bore in a side wall thereof, to engage a registering bore in the door frame. A base leg is fixed to the rear of the bolt, and includes a Y-shaped notch. A conventional keylock cylinder is fixed within the casing, and a key operated barrel is journalled within the cylinder and offset from the center of the latter and has a radially-outwardly-projecting lug. An annular member is rotatably mounted around the keylock cylinder between two opposite casing walls, and includes an inner projection and an outer operating arm which engages the Y-shaped notch of the base leg.

Abstract: An actuating structure is provided for a switch lock having a barrel with a plug which is key actuated for rotation therein. An actuator interconnects the rotatable plug with a rotatable shaft of the switch and cooperates with a rotatable stop plate connected to a return spring. Specifically, an actuator lug and a stop plate surface which engage upon rotation of the plug in one direction to turn the switch momentarily from the first position to a second position against the action of the spring. The actuator also rotates in the opposite direction independently of the stop plate to turn the switch from the first to a third position.

Abstract: A key actuated tubular lock capable of a plurality of locking operations, each with switch operating capability, includes a substantially cylindrical outer barrel, key actuated locking spindle means, including a stationary sleeve and a rotatable sleeve, disposed within the barrel and a multiple operation switch operating assembly rigidly attached in a removable manner and adapted to be operated by rotation of the locking spindle through use of a proper key. The multiple operation assembly includes a switch subassembly, having a microswitch and a switch operating member associated therewith, positioned within a switch retention area in the rear end portion of the barrel in such a way that the operating member is contacted so as to turn the microswitch "off" when the locking spindle is in a first position and "on" when the spindle is key actuated to a second position.

Abstract: The backset of a deadbolt lock may be adjusted selectively between 23/8" and 23/4" by manually shifting a spring-loaded pin which extends through vertical slots in the lock bolt, U-shaped slots in the driver bar and inverted L-shaped slots in the lock case. The pin also connects the driver bar to the bolt and causes the bolt to move between extended and retracted positions when the operating spindle of the lock is turned.

Abstract: A lock assembly of the type mounted on a door or like closure structure and including two lock cylinders each at least partially encased and surrounded by a casing structure each of which has reinforcing means formed thereon so as to prevent collapse or destruction of said casing structure upon receiving an extreme force such as a blow with a hammer or the like. An activating structure is interconnected between a bolt element and each of the lock cylinders such that rotation of either lock cylinder, as by a key, causes at least partial rotation of the activating structure and linear movement of the bolt element into either an extended or retracted position.

Abstract: The baggage closure incorporates a closing lever which carries a cylinder rotatable by means of a key and intended for locking the closing lever in the closing position. According to the invention, the cylinder (3) has a cam (7) which interacts with a lug (8) on the mounting (2) of the closing lever (1). Located on the closing lever (1) is an extension (9) which interacts with an orifice (16) in a closure fitting (10) fastened to the baggage.

Abstract: The invention relates to a rotatable connection device for a driving part (1) to a driven part (2), wherein the driven part has a rotational play relative to the driving part. The driving part (1) exhibits at least two axial elastic dogs (3, 4) which end in radial teeth (5, 6) and cooperate with circular arcuate slots (8, 9) in the driven part (2), which exhibit enlarged regions (11, 13) for the passage of the radial teeth (5, 6), and with a securing part (14). This securing part (14) is provided with holes (15, 16) to receive the elastic dogs (3, 4), and a bendable strap (17, 18), which is present at each hole (15, 16), after being bent behind the dogs (3, 4), comes into abutment opposite the teeth (5, 6) at their ends. Any accidental disassembly is prevented by this means.

Abstract: A locking apparatus for a compartment door operated by a key comprises an outer cylinder fixed in the compartment door, a rotor inserted into the cylinder, a plurality of locking plates inserted into the rotor radially slidably to engage with the cylinder, one or more engaging plates inserted into the rotor radially slidably, a ring surrounding the rotor independently rotatable with respect to the rotor, a lip projected from the ring engageable with the engaging plates, operating means to rotate the ring, and engaging means maintains the door closed and releasable by the rotor. In door-opening operation, the rotor is rotated by the key from a locking position to an releasing position, then the key is removed to engage the ring with rotor. This engagement enables the operating means to rotate the rotor through the ring.

Abstract: An improved locking device, useful in, for example, a key-operated slide fastener bag lock of a type having a housing presenting an anvil to underlie a slide of a slide fastener and a rotatable keeper arm movable between an aligned position with respect to the anvil for confining the slide and a rotated out of the way position, and a lock cylinder disposed within the keeper arm, utilizes an actuator member having a cam surface and spring finger that actuate a locking pin when the keeper arm is aligned with the anvil and the lock cylinder rotated from an unlocked to a locked position or the lock cylinder is in a locked position and the keeper arm is moved into alignment with the anvil. The actuator member can be formed of a one piece, molded synthetic material, is light weight, economical to manufacture, and eases assembly as well as occupying a minimum of space, and may also function to limit the rotation of the key-operated lock cylinder within predetermined limits.

Abstract: A vehicle door lock adapted for use with a door latch also operated by an internal lock-unlock pushbutton and/or handle and characterized by a second tumbler assembly angularly spaced around the barrel relative to the usual first tumbler assembly and arranged to lock the barrel and the associated latching lug in the angular position of the second tumbler assembly and such that the latching lug will then lock the corresponding internal manual actuator. This tube prevents one, like a burglar, to open the vehicle doors by maneuvering with a wire around the glass plate of a vehicle door and by pulling up the internal pushbutton.

Abstract: A showcase lock for sliding doors including a keeper plate attached to one door and a lock adjustable along the keeper plate to lock the doors in a closed position. The keeper plate has inwardly directed flanges along opposite side edges defining opposed grooves and a row of stops between the flanges and the lock has outwardly directed flanges along opposite side edges slidably receivable in the opposed grooves on the keeper plate. The lock has a rotary key operated plug, a cam on the inner end of the plug, and a resilient U-shaped latch member mounted for rocking movement about an axis crosswise of the plug between a locked and an unlocked position.

Abstract: A double cylinder lock bolt has a key for the inside lock cylinder which is retained by a latch operable from the outside locking cylinder. Three alternative means for preventing operation of the inside cylinder by the outside key are disclosed. The arrangement makes a double cylinder deadbolt more suitable for use in fire or panic situation without sacrificing security.

Abstract: A key retaining cylinder for a lock operative on standard keys is disclosed. The cylinder of the lock includes an idler ring driven in rotation, with lost motion, by the lock plug. The idler ring is cooperatively disposed with respect to one of the pins so as to restrict the motion thereof when that lock has been used to lock the lock set and to not restrict the movement thereof when that lock has been used to unlock the lock set. Restricted movement of the pin together with the contrapment of the pin within the combinational notch of the key prevents removal of the key. Further features and embodiments are disclosed including provisions for symmetrical operation thereof for left-handed and right-handed doors.

Abstract: A double cylinder lock constructed with a single tailpiece driver and a clutch. The interior lock key can be extracted only when the lock bolt is retracted and not when the lock bolt is extended. The driver and clutch arrangement prevent either cylinder from becoming out of time, regardless of which cylinder is used to throw the bolt.