Abstract: An anti-picking device for a lock includes a casing, a rotating body, a key guiding seat and a linking member. The casing has a compartment. The rotating body is rotatably received in the compartment and has an actuated member adapted to rotate the rotating body relatively to the casing and an insertion hole axially connecting two end faces of the rotating body. The key guiding seat is received in the compartment and has an arc guiding groove and a receiving hole. The arc guiding groove communicates with the receiving hole, and the receiving hole penetrates through the key guiding seat in the axial direction. The linking member is received in the receiving hole of the key guiding seat and has an engaging part at a first end, while a second end of the linking member extends out of the receiving hole.

Abstract: An unlocking device includes a casing mounted to a side of a lock. A movable body is movably received in the casing along a first axis and has an opening. The lock has a keyhole in an extent of the opening. A key receiving seat is movable along a second axis perpendicular to the first axis between a first position received in the movable body and a second position at least partially outside of the movable body. A linking rod is extended into the movable seat. A key can be placed into a key receiving hole of the key receiving seat in the second position and then moved into the movable body to engage with the linking rod when the key receiving seat moves to the first position. The key is movable into the keyhole by moving the linking rod along the first axis and is rotatable for a locking or unlocking operation.

Abstract: An unlocking device includes a casing mounted to a side of a lock having a keyhole. A movable body is rotatably received in the casing about an axis. The movable body has a closed end having a through-hole. A key receiving seat is received in the movable body and has a passage. The keyhole is normally blocked by the closed end of the movable body. The movable body can be rotated to align the through-hole with the keyhole and the passage. A manually rotatable linking rod extends through the passage and has an engaging portion for coupling a key received in the passage. The key can be moved into the keyhole by moving the linking rod along the axis and can be rotated for a locking or unlocking operation.

Abstract: A door lock indicator device is disclosed. The door lock indicator device can include a rotatable portion, a lock status display, and a switch (e.g., a button). The rotatable portion can define an opening shaped to receive a key blade. The door lock indicator device can be installed on a face of a door lock with the opening aligned with a keyhole of the door lock. Rotating a key blade within a keyway of the door lock can cause the rotatable portion to rotate with the door lock's cylinder. The lock status display can include a first indicator light and a second indicator light. Activating the switch can cause the lock status display to indicate a direction of a most recent rotation of the rotatable portion and/or a locked or unlocked status of the associated door lock.

Abstract: A door lock indicator device is disclosed. The door lock indicator device can include a rotatable portion, a lock status display, and a switch (e.g., a button). The rotatable portion can define an opening shaped to receive a key blade. The door lock indicator device can be installed on a face of a door lock with the opening aligned with a keyhole of the door lock. Rotating a key blade within a keyway of the door lock can cause the rotatable portion to rotate with the door lock's cylinder. The lock status display can include a first indicator light and a second indicator light. Activating the switch can cause the lock status display to indicate a direction of a most recent rotation of the rotatable portion and/or a locked or unlocked status of the associated door lock.

Abstract: An unlocking device includes a casing mounted to a side of a lock having a keyhole. A movable body is rotatably received in the casing about an axis. The movable body has a closed end having a hole. A key receiving seat is received in the movable body and has a key receiving hole. The keyhole is normally blocked by the closed end of the movable body. The movable body can be rotated to align the hole with the keyhole and the key receiving hole. A block is fixed to the movable body and includes a through-hole extending along the axis. A manually rotatable linking rod extends through the through-hole and has an engaging portion for coupling a key received in the key receiving hole. The key can be moved into the keyhole by moving the linking rod along the axis and can be rotated for locking or unlocking operation.

Abstract: An ignition switch device is provided with a switch having a key hole allowing a regular ignition key K to be inserted thereinto, and capable of being rotationally operated in a predetermined direction with the ignition key K inserted to start and stop an engine of an industrial machine, a case covering the switch and formed with an insertion hole allowing the key hole to face the outside, and a main guide shape composed of a groove having a V-shaped cross-section, which is formed on the surface of the case, and extending toward the insertion hole to allow the tip Ka of the ignition key K to be guided to the key hole.

Abstract: A process for opening a combination lock having a known opening sequence with a tool having a driven portion operable only upon receipt of an authorization, the process including associating the tool's driven portion with the lock such that the driven portion automatically calibrates with the lock irrespective of the initial position of the lock and authorizing the driven portion to proceed through the known lock opening sequence of a predetermined series of clockwise and counterclockwise rotations to unlock the lock. A method of opening a combination lock with a tool, the combination lock having an opening sequence consisting of clockwise and counterclockwise rotations of a non finger manipulable lock opening component, the method including mating the tool with the lock opening component and operating the tool to rotate the lock opening component through a series of clockwise and counterclockwise rotations corresponding to the opening sequence to unlock the lock.

Abstract: Disclosed is a system for locking and unlocking a component, where the system comprises a lock adapted to lock a component, the lock capable of being opened by manipulation of a combination mechanism, the lock having a communication apparatus for communicating information related to the opening of the lock with a tool. The system further comprises a tool matable with the lock and adapted to open the lock by manipulation of the combination mechanism, the tool adapted to receive the communicated information related to the opening of the lock from the communication apparatus. Also disclosed are locks and tools suitable for use in such a system, and methods of opening at least one combination lock with a tool.

Abstract: An ignition module assembly having a housing member connectable to an ignition system the housing having an undulating surface. A slider member is connected to the housing member and moved between a plurality of discrete positions. The slider member controls the ignition system based on its discrete position. The slider member is configured to receive a key fob. A spring member is compressed between the slider member and the undulating surface and is configured to slide along the undulating surface as the slider member moves between the plurality of discrete positions. The undulations correspond to the discrete positions and a user inserting the key fob into the ignition module assembly and moving the slider member receives haptic feedback to discern the position of the slider member.

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

Abstract: An ignition switch device is provided with a switch having a key hole, and capable of being rotationally operated in a predetermined direction with an ignition key inserted to start and stop the engine of an industrial machine, a case covering the switch and formed with an insertion hole allowing the key hole to face the outside, a shutter rotatable between a closed position where the insertion hole of the case is closed, and an open position where the insertion hole is opened to allow the key hole to face outside, and a gutter formed on the surface of the case, and extending toward an outer end of the case while a base end communicates with the insertion hole.

Abstract: A protective cover for a keyway disposed on an end surface of a lock is provided. A housing is adapted to be assembled over the lock end surface. The housing includes an opening that surrounds the keyway. At least one door is disposed in the housing opening. The door includes an edge for aligning with the keyway in a key insertion position. When a key is pressed against the door, the door moves away from the keyway, providing a key opening in the housing opening for insertion of the key into the keyway. At least one door biasing member engages the door and biases the edge of the door toward the keyway. The door is mounted on a pivot member disposed in the housing opening such that the pivot member and door pivot within the opening when the key is inserted into the keyway and turned in the lock. At least one pivot biasing member engages the pivot member to hold the edge of the door in alignment with the keyway when the keyway is in the key insertion position.

Abstract: A device for opening a locked door or drawer, which device comprises; a) means for facilitating the insertion of a key into a lock; and b) means for rotating said key when inserted.

Abstract: To provide a key cylinder device equipped with a handle lock mechanism which can maintain a handle lock mechanism of a key cylinder unit with a shutter to provide an improved assembleability of the key cylinder device. The bolts for fixing a shutter housing are attached from the back surface of the top plate of an inverted angular U-shaped bracket. Thus, even when a gap is generated between the shutter housing and a vehicle body cover, the bolts are not exposed and hence cannot be easily loosened. In addition, by mounting the key cylinder device in the vehicle body cover and then mounting the vehicle body cover thereon, assembleability can be improved.

Abstract: A lock includes a main body, a shining device, and a switch; the main body has a holding portion on one side thereof, which is formed with a through hole; the shining device is held in the holding portion of the main body, and it includes a power source, and a light emitting element; the light emitting element is held in the through hole of the holding portion of the main body such that light emitted from it will travel outside the main body; the switch is connected to the shining device for turning on/off the power for the light emitting element.

Abstract: A locking device, which mounts a user key (the first key) and a manager key (the second key) separatedly, places a first lock and a second lock unitedly in an outer cylinder. The first lock is opened or rotated by the first key. After the first lock is open, the first key cannot be pulled out of the locking device. If the second lock is open by the second key, the first key can be pulled out together with the second key.

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 device for opening a locked door or drawer, which device comprises; a) means for facilitating the insertion of a key into a lock; and b) means for rotating said key when inserted.

Abstract: An electronic article surveillance (EAS) tag 20 having a metal attaching member 34 located therein and adapted to securely and releasably receive a shaft 52 of a pin therein, whereby a predetermined arcuate probe is inserted through an opening and applies a requisite force to the attaching member 34 to release the shaft 52. There are no channels leading the authorized arcuate probe to the attaching member 34. A plurality of partitions 58 and pillars 62 are interspersed within tag 20 to deflect any unauthorized probes from engaging and detaching attaching member 34.

Abstract: A Child Proof Key for Barrel-housed Gun Lock is disclosed. Also disclosed object of the present invention to provide a Child Proof Key for Barrel-housed Gun Lock. The lock includes a handle defined by a slot formed along its length for acceptance of the shaft. The shaft is hinged at one end which permits the shaft to be stowed within the shaft slot. The shaft terminates in a key socket at its head for engagement with the keyed head of a bore-housed gun lock. The key further includes a bushing along the length of the shaft for centering the key socket within the barrel of the weapon, and further to identify the size by indicia inscribable thereon (or other desirable indicia). Very importantly, the shaft slot formed in the handle is defined by a shoulder and a shaft bore, with the gap between the two shoulders being slightly smaller than the diameter of the shaft such that the shaft snaps into the slot when stowed.

Abstract: A standard mortise latch lock escutcheon or trim plate having an aperture for housing an electroluminescent strip captured within a two-piece lens structure. A dc or ac external power supply converter is used in conjunction with the existing grid power. The converter is situated on the mortise lock casing. The electroluminescent strip is captured within the lens structure along with partially transparent, lettered signage. The lens structure has an outer lens with a protrusion to align the signage within the aperture. The lettered signage is reversed lettered, such that light emits through the letters and is blocked by an opaque background when the electroluminescent strip is supplied power. In instances where the mortise latch lock is used on doors for purposes other than egress, a switch may be used to toggle power to the signage when the thumb lever is turned in a locked position.

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 lighted deadbolt according to the present invention includes a lock cylinder and a cylinder guard, a light assembly including a light source, a wiring harness including a plurality of wires electrically connected to the light source, and an annular adapter. The adapter includes a housing for receiving the light source and an annular channel for guiding the plurality of wires from the light source. The annular adapter includes a first surface, a wall extending orthogonally from the first surface, and a first plurality of tabs extending from the first surface generally parallel to the wall. The plurality of wires are operatively disposed between the first plurality of tabs and the wall. The adapter further includes a pair of fingers extending from the surface for receiving a sound producing device and a second plurality of tabs extending from the wall. The plurality of wires electrically couple the light source to the sound producing device.

Abstract: The invention relates to a built-in safety device comprising a housing (3) and a rotor (4) mounted therein. Tumblers (8) are mounted in the housing (3) and in the rotor (4). The maximal length (A) of the built-in safety device (1) is approximately 40 mm, and the effective part (2c) of the key (2) is essentially as long as the rotor (4). In addition, the rotor (4) is constructed as one piece and can be operated from both sides thereof. The inventive built in safety device can be installed in a mortise lock more easily than a cross-key bit safety device and permits the production of a locking system.

Abstract: A rotation restricted barrel lock and key includes a rotationally actuated barrel lock and a key for opening the lock. The key comprises a lock engaging portion rigidly attached to a handle, and a sleeve rotatably mounted on the handle shaft. The sleeve may slide axially along the shaft within preset limits. Lock actuation is characterized by rotation of the lock engaging portion of the key relative to the lock. During actuation of the lock, a set of prongs on the sleeve engages a complementary set of notches on the barrel lock, thereby non-rotatably coupling the barrel lock to the sleeve. By grasping the sleeve, the user can prevent rotation of the lock while turning the key handle, and thus actuate the lock.

Abstract: An apparatus for insertion of a key therein substantially prevents foreign matter from entering into a key insertion hole, and even if foreign matter does enter into the key insertion hole, discharges the foreign matter therefrom. A shutter is provided within the key insertion hole so as to be movable along a direction of insertion of a key. The shutter is always urged by a compression coil spring toward an opening of the insertion hole. In a state in which no key is inserted in the insertion hole, the shutter is urged by the compression coil spring and closes the insertion hole. As a result, foreign matter such as dust or the like can be prevented from entering into the insertion hole. Further, the shutter is provided with a reflecting surface, and when no key is inserted in the insertion hole, the reflecting surface reflects light from a light source so as to illuminate the opening of the insertion hole.

Abstract: An illuminating casing for receiving a handle of a key includes a lower shell and an upper shell wherein a top extends laterally from the peripheral wall of the lower shell so as to define a chamber for receiving the handle. A light is disposed beside the top and a battery is disposed between the top and the upper shell which has a button disposed thereto. The top has a tongue extending therefrom and has an inclined surface forward of the bottom of the lower shell. The handle of the key has an aperture defined therethrough so that when the handle is inserted into the chamber, the tongue is pushed slightly by the handle, and when the handle slides over the tongue, the distal end of the tongue is securely engaged with the aperture of the handle.

Abstract: A vehicle spare wheel lock construction including a lock body having a funnel guide mounted on one end thereof and a multi-fingered spring-type retaining washer mounted on the other end thereof for biting engagement with the internal surface of a handle receptacle of the winch. The lock body has a key-receiving groove in the end thereof and a key adapter is mounted on the end of a winch handle and has a curvilinear ridge on the end thereof which is guided into the curvilinear groove of the lock body by the frustoconical funnel guide and an adjacent internal frustoconical surface within the lock body.

Abstract: An emergency color and tactile coded identification plate comprising a face plate, a clear tamper resistant plastic center, and a back plate is used to control access to and from locations within and around a secured facility. The face plate has configured openings that correspond to configured markings on the back plate such that the configured markings on the back plate fill the configured openings of the face plate when the identification plate is assembled by aligning and bringing the face plate, the clear plastic center, and the back plate into contact with each other to form a single unit. The present invention provides a multiple indicia emergency plate that allows fast identification of the correct key for a specific door in a secured facility that uses both visual and tactile indicia.

Abstract: An electronic module which is located between the plug cover and the front flange of the cylinder body has light and motion sensors that look out through holes in the cover. Whenever it is dark and a person approaches the lockset a light will be turned on to illuminate a translucent ring that surrounds the keyway.

Abstract: A key chain with magnifying glass is provided including a housing having a key ring mounted thereon. Also included is a magnifying glass situated on the housing.

Abstract: A key structure with illumination function including a grip housing composed of a first and a second casing, a key plate enclosed in the grip housing and having a key head extending out of the grip housing, a cell disposed beside the key plate and a light emitting diode having two terminals extending to two electrodes of the cell. By depressing a depression button, the terminals of the light emitting diode are electrically connected with the cell to form a closed circuit so that the light emitting diode can emit a light beam to illuminate the circumference of the key hole. Accordingly, in a dim place, a user can easily use the key to unlock the lock.

Abstract: A gearshift-stick locking assembly includes a padlock body, an annular fluorescent seat and a shackle. The seat is shaped as a rectangular frame and is made of a rubber containing a fluorescent material. The padlock body has a top surface and a mushroom-shaped projection which projects integrally from the top surface so as to define therebetween an annular groove within which the frame is engaged. The frame has two curved opposite side surfaces each of which defines a shackle-positioning slot. The legs of the shackle are engaged fittingly within the slots. Preferably, each of the curved opposite side surfaces of the frame is provided with several longitudinally extending ribs and bumps for contact with the legs of the shackle.

Abstract: An antitheft locking device has a steering wheel engaging member (30) with an end wall (32) covering the steering wheel (12) over its part that includes at least two ribs (16, 18), a peripheral wall (33) extending over at least a part of the outer periphery of a rim (14) of the steering wheel, and two spaced stops (34) protruding from end wall (32) and engageable with the ribs. A stop member (24) attached to steering wheel engaging member (30) extends at an angle with respect to its end wall (32) and is engageable with a fixed part (26) of a vehicle. A locking mechanism has a lock (60) made fast to steering wheel engaging member (30) and a locking member (72) connected to the steering wheel engaging member for movement to a locked position in which locking member (72) and steering wheel engaging member (30) fully enclose rim (14) of steering wheel (12).

Abstract: A lead-in device is used during installation of a rim-type lock cylinder having a tailpiece in an exit mechanism including a cam having a tailpiece receiving aperture. The lead-in device includes a converging tunnel having an exit aperture sized to match the tailpiece receiving aperture and an entrance aperture that is larger than the exit aperture. The lead-in device also includes a pair of arms positioned to be inserted into the cam aperture to hold the exit aperture in registry with the cam aperture and to maintain the entrance aperture at a predetermined distance from the cam. When the arms are positioned in the cam aperture and the exit aperture is in registry with the cam aperture, the converging tunnel guides a tailpiece inserted into the entrance aperture through the exit aperture and into the cam aperture to engage the cam.

Abstract: A lock assembly including a locking cylinder having a keyhole into which a key can be inserted, a lighting system for dispersing light energy in the area of the keyhole, including an L.E.D. light source, and a battery operated circuit for repeatedly operating the L.E.D. light source with a selected "on" time followed by a selected "off" time.

Abstract: A key guide for aligning an inserted key with a keyhole includes a guide body having a guide surface that spirals from an insertion opening of the guide body to the keyhole. The spiraling surface induces rotation of the inserted key until the flat blade of the key engages a stop wall extending substantially parallel from the keyhole, where alignment between the key and the keyhole is achieved.

Abstract: A cylinder lock having a key insertion hole or clearance formed between a casing and a key guide member. A key for the cylinder lock is provided with a thin cylindrical member which is to be inserted into the annular key insertion hole when the key is inserted into the cylinder lock. The cylindrical member is filled at its first end section with a part of a key shank. A slider is slidably disposed inside the cylindrical member and normally located inside the second end section of the cylindrical member. The slider is formed at its tip end with a fitting projection which is to be fitted in a guiding depression formed at the tip end face of the key guide member. The key insertion hole is formed narrow or thin, corresponding to the thin cylindrical member of the key, thereby preventing a picking tool from being inserted through the narrow key insertion hole into the cylinder lock.

Abstract: A padlock having a body, a U-shaped keeper at one end of the body, and a key receptor at the opposite end of the body, the body containing a row of pieces to be engaged by key teeth comprising an indicator device on the body; the device having a location on the body relative to the pieces to indicate the left or right directional orientation of key teeth insertion into the receptor, to effect opening of the padlock keeper; and the indicator device extending in the direction of key insertion.

Abstract: A padlock having a body, a U-shaped keeper at one end of the body, and a key receptor at the opposite end of the body, the body containing a row of pieces to be engaged by key teeth comprising an indicator device on the body; the device having a location on the body relative to the pieces to indicate the left or right directional orientation of key teeth insertion into the reception, to effect opening of the padlock keeper.

Abstract: A key-operated lock as is used in automobile doors and home doors, which device preferably comprising a base with a slot shaped cover secured aboout the lock. This base having a hinged cover and characterized by a slot shaped opening which fits about the lock. A plastic material within the cover and base is placed in a sealing relationship with the face of the lock and across the lock key entrance when the cover is in a closed position. The grooved base of the cover permits the opening or closing of the cover for use of the lock.

Abstract: A lock operable by a key between a locked condition and an open condition, the lock having a fastener for releasably securing the lock to an object, the fastener being movable between a retracted position wherein the lock is in the open condition and an extended position, a spring for biasing the fastener to the retracted position and an enclosure having an opening adapted to allow the insertion and removal of the key from the lock when the lock is in the locked condition and to prevent the removal of the key from the lock when the lock is in an unlocked condition.

Abstract: A portable bar attaches tangentially and locks to a vehicle steering wheel, preferably at the uppermost section of the rim, and extends to where it is fully visible from outside of the vehicle. The bar is a holllow tube in which a pair of clamping members, one being a fixed section of the tube and the other part hinged thereto, surrounds and is locked about the steering wheel rim. A cavity in the tube protectively encloses, along with anti-saw-through bars, alarm circuitry and the batteries therefor. Light and sound annunciators on the bar and a flashing LED armed-condition indicator are provided. A panic button on the outside of the tube to manually trigger the alarm, and push button selectors enclosed in the tube and accessible only when the device is unlocked to arm and disarm the alarm and to activate the light to serve as a flashlight or emergency flasher.

Abstract: A device for assisting the crippled hand to turn a key in an automobile starter switch lock has an elongated member that firmly grips opposite faces of the key head and has longitudinal portions which rigidly extend the moment arm for application of turning force. In one form the device has recesses to receive the tabs of a steering column mounted starter switch. In another form, the device has a protuberance to project the key into the recess of a recessed switch on a dashboard. A preferred embodiment has hinged rigid panels with hollowed internal surfaces that mount keys for slidable and pivotal movement along tracked guideways. The internal surfaces have raised marginal edges interrupted by a slot through which the shank of a key may be passed.

Abstract: The invention comprises a two part key which replaces a conventional key in a conventional lock cylinder for purpose of temporary use wherein one of the parts is a plastic or similar material insert which replaces a portion of the conventional key and a short conplementary key which permits operation of the lock in conjunction with the insert. The insert being secured in the cylinder by means of the cylinder locking pins and being removable only by means of a special installation and extraction tool.

Abstract: An apparatus for positioning a key at the keyhole of a lock. The apparatus includes a hollow, funnel-shaped element having a wide end and a narrow end. The wide end defines a wide opening which is sufficiently large, and the funnel-shaped element is sufficiently deep, to permit the partial introduction of the index finger and thumb of the user holding the key into the funnel-shaped element. The apparatus also includes means for securing the funnel-shaped element in a position adjacent the keyhole so that the narrow end is located adjacent the periphery of the keyhole during use. The narrow end defines an opening which is larger than the keyhole but sufficiently narrow to enable the user to accurately locate the keyhole.

Abstract: A lock has an outer casing and a lock cylinder rotatably mounted therein and having a coaxial keyway of round cross section plus several rows of radial bores to accommodate the tumblers and their springs, and also has a key which has notches on its outside profile for the engagement with the tumbler. The key has an equilateral polygonal bit cross section which matches the cross section of the keyhole in the front wall of the lock casing as well as a coaxial opening in the lock cylinder bottom, these cross sections of the keyhole and bottom opening being angularly offset from one another. The tip of the key bit has ramp surfaces corresponding to the rows of the tumblers, ascending toward the handle of the key and terminating each at one polygon face for the purpose of raising the tumblers, and the rows of notches are disposed between the polygon faces.

Abstract: A security device is disclosed which mounts to a king pin of a trailer to prevent unauthorized coupling of the trailer to a tractor. The security device includes a locking device which functions as a deadbolt. Within the locking device are contained a key actuated lock cylinder, a cam actuator and bearing balls which are moved by the actuator to lock the locking device in place and thereby lock the security device to the king pin. The exterior end of the locking device has a small 90.degree. opening through which the key for the locking cylinder is inserted and which permits limited rotation of the key for locking and unlocking the lock cylinder while preventing withdrawal of the key except when the lock cylinder is locked. This provides a positive indication as to whether the locking device is locked or not.

Abstract: A lock guard to prevent picking of locks by thieves, which guard is particularly useful for mailboxes subject to weather and vending machines which store money. The guard is essentially a rectangular box having a side opening for insertion of the padlock and a pair of slots at right angles to each other, one slot below the side opening and the other at right angles on the front portion of the box. By clipping a key to a lever and inserting it in the first mentioned slot and then rotating it in the last mentioned slot the padlock may be unlocked.