Abstract: An illuminated combination pad lock that illuminates in response to pressing in the combination dial or raising the shackle although still in the locked position. The illumination ceases in response to release of the combination dial or the shackle.

Abstract: A pod for transporting a cassette containing semiconductor wafers includes a base and a cover removably carried on the base for protectively enclosing the cassette. A latching mechanism for latching the cover on the base is provided with an electrical sensor that senses when the cover is properly latched on the base and controls an electrical light on the base to provide a visual indication of latch status.

Abstract: A process reliably detects the change of the locking state of at least one lock with a logic with memory and display attached to a key. The process includes determining a rotation of the key associated with the lock within the lock, detecting a single or multiple rotation in unlocking or locking direction of the lock and simultaneously determining whether the detected rotation occurs in unlocking or locking direction of the lock. A signal is generated that indicates the unlocking or locking of the lock. This signal is stored in the memory of the logic, and the signal is displayed. A device for implementing the process includes one or several markers mounted near the lock, one or several sensors non-rotatably connected with the key for detecting these markers, a logic attachable to the key with a memory in which data can be stored whereby the logic can process the signals received from the sensors, and a display for displaying the locking state.

Abstract: A torque-limited key includes a grip and a lock or latch engaging member. A torque-limiting device connects the grip to the engaging member. The torque-limiting device may include a spring, a frictional engagement, or any other type of resilient member. The torque-limiting device allows a torque applied to the grip to rotate the engaging member, so long as the applied torque is less than a predetermined level. If the applied torque exceeds the predetermined level, the grip will rotate relative to the engaging member in order to prevent breaking the engaging member off inside the lock or latch, and also in order to prevent damaging the mechanism of the lock or latch.

Abstract: An electronic combination lock having a dial-shape handle with a keypad incorporated therein is disclosed. Rotation of the handle extends or retracts a bolt that closes or opens the lock. The keypad includes indicia that give the user visual cues as to the orientation of the handle, thereby informing the user of the extended or retracted condition of the bolt. A battery pack is used to energize circuitry that recognizes a code entered through the keypad. The circuitry provides a control signal that activates a solenoid to extend or retract a bolt blocking device, which in turn prevents or enables movement of the bolt. A visual indicator warns of a low voltage or power condition in the battery pack. Electrical contacts are provided in the face plate of the handle to connect the circuitry to an external power source in case the battery pack fails.

Abstract: A locking device for use in connection with an energy controlling apparatus, such as a valve, or regulator, to prevent unauthorized persons from changing the position of a rotatable shaft of the apparatus that controls the amount of energy that flows through the apparatus. The locking device includes a handle used to manually set the position of the shaft. It also includes a gear that is rotatably mounted in the handle and is fixed to the shaft of the apparatus. A first locking mechanism carried by the handle mechanically and selectively couples the handle and the gear through a key access to the lock. A spring-biased ratchet mechanism may be provided to permit rotation of the shaft in one direction only. A personal locking mechanism with only a single key is selectively lockable to the handle so that in the locked position it prevents access to the first locking mechanism.

Abstract: A door lock particularly suited for an apartment or condominium where the resident has an entry key and management personnel also have a key that will allow access to the apartment, the door lock having a spring loaded axial pin which is retained in an externally visible position when the lock is actuated by the resident's key and which is released to an externally non-visible position when the lock is actuated by the management key.

Abstract: An improved pressure-actuated door access bar is disclosed which may be located on a door to control access or egress through the door, whereby the door access bar is used to trigger unlocking or opening, or both unlocking and opening, of the door following pressure being exerted on the door access bar by an individual desiring access or egress through the door. Two electromechanical force transducer assemblies having no moving parts are mounted within a rigid base member which may in turn be mounted on a door or in another desired location, and a cover member mounted over the base member exerts pressure on the electromechanical force transducer assemblies when pressure is placed on it. When a given amount of pressure is detected by either or both of the electromechanical force transducer assemblies, the door will be unlocked or opened, or both unlocked and opened.

Abstract: A chest lock has a linking action and consists of a base, a lock tool set mounted on the base and composed of a lock tool and two linking members which are located at two ends of the lock tool, two retaining members disposed at two ends of the lock tool set such that the retaining members are actuated by the linking members to slide on the base, two lock retainer sets consisting of a lock retainer seat, a slide block and a lock retainer. The lock retainer seat is disposed at one end of the base for the retaining hook to be inserted thereinto. The outer ends of the retaining members are inserted into the lock retainer seats. The slide blocks are slidably disposed in the lock retainer seats and provided with a retaining portion corresponding to the retaining hook. The lock retainer has a body which is pivoted at one portion thereof with the lock retainer seat, and connected at other portion thereof with the slide block.

Abstract: The key has a head (2) provided with a window (3) enabling to see a portion (5) of the surface of the cylinder of the body (4) of the key. Two grooves (16) extend each one over one half of the circumference of the body (4), they are mutually offset by 180 degrees and ended by bores (7). In the service position, pins (12) are urged towards the bottom of the bores (7) by a resilient member (13). When the torque applied to the head (2) of the key increases, the pins (12) are expelled from the bores (7) and the head of the key can rotate by 180 degrees relatively to its shank (1), thus showing the opposite portion of the body (4) through the window (3).

Abstract: An electronic combination lock having a dial-shape handle with a keypad incorporated therein is disclosed. Rotation of the handle extends or retracts a bolt that closes or opens the lock. In one embodiment, a gear rotated by the shaft displaces the rack end of radially-extending bolts that extend or retract. The keypad includes indicia that inform the user of the extended or retracted condition of the bolt. A battery pack is used to energize circuitry, and the circuitry provides a control signal that activates a solenoid to extend or retract a bolt blocking device, which in turn prevents or enables movement of the bolt. A visual indicator warns of a low voltage or power condition in the battery pack. Electrical contacts are provided in the face plate of the handle to connect the circuitry to an external power source in case the battery pack fails.

Abstract: In a preferred embodiment, a lock system including a lock and a key, including: a lock housing; a rotatable member disposed in the housing, rotation of which rotatable member selectively effects locking and unlocking of the lock; blocking apparatus operatively connected to the rotatable member to prevent unlocking of the lock except upon receipt of an electrical unlocking signal; key apparatus having an end insertable in the housing and into an end of the rotatable member for rotation of the rotatable member; and apparatus to permit a portion of the rotatable member to rotate without damage to any elements of the lock if rotation of the rotatable member is attempted without receipt of the electrical unlocking signal.

Abstract: A security indicator has a two part telescopic locking bar attached to the handle of a door at one end and to the door or door jamb at the other end through an end piece. The device includes a cup or tube which encases the door handle, preventing use of the handle. The length of the bar is fixed by aligning apertures in each part of the telescopic locking bar to form a continuous aperture, inserting a frangible pin through the continuous aperture and locking the frangible pin in place with a padlock received by a hole in the frangible pin. The pin has a narrow portion which can be broken by relatively little human force. The device requires someone who does not have the key to the padlock on the frangible pin to break the frangible pin to enter a door fixed with the device. A broken pin alerts the occupant that an entry has occurred during his/her absence. A sleeve normally protects the narrow portion but slides easily away to expose the narrow portion when entry is desired.

Abstract: A new and improved device for securing the accelerator and brake pedals of a vehicle including a lower plate having a first rectangular notch and a second rectangular notch, a primary aperture and a secondary aperture, a lock indicator having a lower surface and an upper surface with the upper surface of the lock indicator secured to the lower plate, a number of light emitting diodes secured to one of the edges of the lock indicator. The device further includes an upper plate having a first rectangular notch and a secondary rectangular notch, a primary aperture and a secondary aperture. A pin is employed in securing the lower plate to the upper plate by way of the primary aperture. The pin enables the lower and upper plates to be pivotally related to each other. A locking device is secured within the secondary apertures of the lower plate and upper plate. The lock is defined by a key receiving end and a cylinder end.

Abstract: A lock condition indicator device which is adapted for affixation to a key for a cylinder lock has a substantially circular movable means adapted to be retained in juxtaposition to a head portion of the key, but rotatable about a longitudinal axis of the key when an engaging means on the circumference of the movable means encounters an obstructing means on an outer surface of the lock, resulting in the movable means being rotated into one of a plurality of indicator positions.

Abstract: A musical door lock comprises a generally rectangular housing having enclosed therein door lock, an electric door bell and a battery chamber. When a push-button on the outer periphery is pressed to actuate a sound generator inside the housing, the combined electric door bell will release a musical melody or the sound of bird chirps inside the door. A second example provides a frequency regulator instead of a sound generator incorporated with a movable wireless door bell that offers more convenience to the house owners. In addition an anti-burglar device combine with the lock mechanism for releasing a warning signal which may be received by a portable radio receiver. This disclosure is characteristically providing an economical utility of space in a door lock as well as its variety of functions.

Abstract: A locking/unlocking state confirming device includes a drive magnet formed of at least a pair of permanent magnets and a key provided with a key bow. A magnet holding chamber is formed within the key bow. An indicator magnet within the chamber is magnetized in a direction at a right angle relative to a center axis thereof and has first and second outer peripheral surfaces painted different colors. A viewing window is open to the chamber at at least one side surface of the key bow. A holding plate is disposed within the key bow at a location rearwardly of the magnet holding chamber.

Abstract: A fuel line valve locking assembly for a motorcycle that is in fluid communication with a main tank inlet, a reserve tank inlet and an outlet and which selectively locks a fuel supply line valve closed, open to the main tank inlet, or open to the reserve tank inlet is disclosed.

Abstract: A lock for mounting on a window jamb for selectively grasping a keeper on a window sash to secure the sash closed against the jamb, including a base for mounting to the jamb and defining an open interior space along one side of the base, a rigid plate secured to the base adjacent the open interior space and including a guide slot therein, and a motor driven drive gear pivotable within the open interior space about a first axis. A pawl is secured to the drive gear at one end for pivoting about a second axis spaced from and substantially parallel to the first axis, and includes a keeper grasping portion at its other end. A guide pin projects from the pawl and is slidably received in the guide slot whereby rotation of the drive gear moves the keeper grasping portion of the pawl between the open position and the locking position.

Abstract: A key locking indicator device usable with a key of conventional design for tactile and visual indication of whether the device was last used to look or unlock the look operated by the key. The device is of simple construction, embodies a minimum number of moving parts, and is easy to use.

Abstract: A door handle and lock body housing combination is provided. The lock body housing (1) has a rectangular shaped base configuration (5) which has a length approximately equal to the length of a handle (3) which extends therefrom in a direction generally parallel to the planar base (5). The height and width of the lock body housing (1) is sufficient to wholly accommodate a lock barrel (7) which extends from a front face of the housing (1). The handle (3) is generally "D"-shaped and wherein there is a greater distance behind the handle to the bottom of the planar base (5) at a central region (45) of the handle (3) than at the outer end regions (49) of the handle (3).

Abstract: A locking system is provided for doors with a bolt unit installed on the inside and a control unit installed on the outside of the door. The bolt unit has a casing enclosing a bolt displaceable between a projected, locking position and a withdrawn, unlocking position. A solenoid device has an armature being displaceable between electromagnetically induced attracted and repelled positions. Linkage means are coupled between the armature and the bolt to drive the bolt between the unlocking and locking positions, respectively. A pass code may be entered into the control unit, and in response, a solenoid may be actuated by a current pulse into the unlocked position of the bolt. In addition, a reverse current pulse actuates the solenoid into a locked position of the bolt.

Abstract: The present invention relates to a magnetic card lock with key card which can be inserted into an insertion shaft with gripping opening, the key card being first insertable up to a first stop position, and in which position the key code is requested, and thereupon displaceable by an actuation distance up into the second stop position; in order to obtain a solution which is particularly easily manipulated, it proposes that the broad surface of the key card on its end facing away from the direction of insertion have a visibly differentiated first partial surface (100) which fills up the surface of the gripping opening (107) and is visible in the second stop position.

Abstract: A pawl latch that provides an integral gripping feature to facilitate opening panels and a visual indication of latch closure. The front portion of the latch has two pieces. In the open position, the two pieces are positioned with respect to each other so that the top piece reveals a colored face of the bottom piece. The colored face of the bottom piece can be observed at great distances from the latch. In the closed position, the top piece totally covers the bottom piece so that no color is visible on the latch. Further, in the open position, the front piece is at right angles to the bottom piece, and the front piece is positioned away from the panel so that it can be easily grasped with two fingers to allow the opening of an attached panel. Also, the latch is designed to be attached to a surface of the panel that is not horizontal to a frame to which the panel is to be secured to by the latch.

Abstract: An improved refrigerator door-locking device is provided for locking a refrigerator door to a refrigerator body which may preferably be manufactured substantially of molded plastic parts. The locking device has an elongated first mountable casing which has an elongated opening, and a plunger member which has a projecting rod end and slotted outer rod end slidably fits within the opening. A bayonet connector is located at the projecting rod end of the plunger and a spring biases the plunger toward the projecting rod end. A bayonet receiver is located in a second mountable casing and interacts with the projecting rod end bayonet connector. The locking device provides a visual indication of when it is locked or unlocked.

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 gladhand structure arranged for pneumatic communication between first and second conduits includes confronting and interlocking housings, with the housings including projecting flanges extending in a parallel relationship relative to one another, with the flanges arranged to receive a U-shaped locking rod structure to secure the housings together preventing their disassembly and misalignment.

Abstract: A lockable lock is disclosed, particularly for drink distribution trolleys in aircraft, comprising an additional latch (20) for locking the sliding bolt (7) whose movement is dependent on the pivoting movement of an operating and unlocking lever (8) which also displays, through the aperture (13), the provisioned state of the trolley, the lever (8) being actuated by a key fitted on its shaft (9).

Abstract: A mobile carriage is movable along rails by manual rotation of a handwheel. The mobile carriage comprises a visual indicator that instantly informs a person of the locked or unlocked status of the mobile carriage. The visual indicator comprises at least one ridge on the handwheel and another ridge on a locking knob. The locking knob is loosely captured between the handwheel and a hub for selective rotation relative thereto between first and second end positions. The locking knob has a cam that slides a pin within the hub between first and second positions whereat the pin disengages and engages a stationary lock plate. When the locking knob is manually rotated to the first end position thereof, the pin disengages from the lock plate to enable handwheel rotation and carriage movement. Manually rotating the locking knob to the second end position thereof causes the pin to engage the lock plate and prevent handwheel rotation and carriage movement.

Abstract: A switch lock is provided including a lock plug rotatable by a key between two or more positions within a lock barrel, and a switch is associated therewith such that one switch pole is selectively placed in one or more positions by the plug. A visual switch position indicator includes a second switch pole in the switch with a power source connected thereto, and an LED visible from the lock forward end has its leads connected to a terminal for selective connection to a power source in response to the position of the lock plug. The LED leads are flexible, disposed in a groove in the rear face of the lock bezel, and pass through a space between the lock barrel and the opening in the mounting plate. The switch wires are fixed to a connector and are protected by a shrink tube over the switch.

Abstract: A remote monitoring system for a multi-position loading dock facility having a vehicle restraint lock at each loading/unloading position is disclosed. The monitoring system includes a data processor, and a keyboard and monitor associated therewith, which may be coupled to lock sensing switches and other signalling devices at each loading/unloading position. The data processor, supplied with the developed signals corresponding to the condition of a truck at each loading/unloading position, is operable to continually process these signals to allow display and recording of a plurality of types of data.

Abstract: The pushing in of the push-button of the cylinder lock is detected by detecting the associated motion of the locking rod. An electronic signal is provided upon the detection of such motion. In specific embodiments, the detector consists of a switch mounted on either the locking rod or locking rod cylinder, and an associated cam mounted on either the locking rod cylinder or the locking rod.

Abstract: A portable antitheft locking mechanism for a motor vehicle steering wheel and brake pedal, e.g., a J-bar, having plural lighting elements, such as light emitting diodes, which generally indicate the profile of the locking mechanism so that it may be seen in darkness before forcible entry. The J-bar includes an independent source of power, such as a battery, which energizes the lighting elements either when the J-bar engages the vehicle member or when the access lock is secured, or both. The lighting elements provide means to inform the thief of the J-bar during darkness so as to deter his ill-intended efforts and spare the owner of unnecessary physical damage resulting from forcible entry. The J-bar preferably includes contact switch element which closes upon engagement with the steering wheel and/or a microswitch responsive to securement of an access lock on the mechanism to activate the lights thereby to conserve source when not in use.

Abstract: A safe having a safe door which can be locked by means of a permutation lock. To permit the safe to be used by a series of different persons, the permutation lock (5) is equipped with an externally operatable device for resetting the combination, and also is used in conjunction with a coin-operated release mechanism (19).

Abstract: A device for confirming whether a lock is locked or unlocked in which a display magnet consisting of a sheet- or plate-like permanent magnet is rotatably disposed within a key head. Two magnet pairs, each consisting of a first drive magnet, and a second drive magnet are located at angular positions, respectively, on the front end face of a cylinder lock at opposite sides, respectively, of an intermediate angular position within a range of rotation of a key for locking and unlocking the cylinder lock. The direction of magnetization of one magnet pair is opposite to that of the other magnet pair.

Abstract: A lock arrangement which includes a lock casing (5), a key-operated cylinder lock (1) mounted on one side of the casing, and a knob or finger-turn mechanism (7-10) mounted on the other side of the casing, this knob or finger-turn mechanism being effective in activating a lock mechanism activator device, such as a follower (6) located in the lock casing (5), through the intermediary of a cylinder-lock dogging element (4) and a knob dogging element (8). The cylinder-lock dogging element (4) and the knob dogging element (8) are axially movable and are in end-to-end connection with one another. When the knob or finger-grip is turned to secure the lock, the knob dogging element is moved axially in a direction which causes the cylinder-lock dogging element also to move in its axial direction, to a position which prevents a standard key from being inserted fully into the cylinder lock.

Abstract: A key has reed switches which are disposed within a head of the key, and switch actuators comprising bias magnets disposed adjacent the reed switches, respectively, and a pair of first driving magnets and second driving magnets which are disposed at the front end face of a cylinder lock and alternately magnetized in opposite directions. In response to the close proximity of the bias magnet and its corresponding driving magnet, the corresponding reed switch is actuated according to the mutual coaction between each bias magnet and its corresponding magnet. The rotation of the key for locking the cylinder lock and the rotation of the key for unlocking the cylinder lock are made to correspond with open and closed states of the reed switches, or the most recent of a locking signal and an unlocking signal.

Abstract: A deadbolt-type doorlock particularly useful for public buildings such as schools which enables the locked or unlocked condition of the lock to be visually displayed and also enables locking of the slide bolt in either its door locking or door unlocking position. The deadbolt lock includes a lock housing having a movable bolt assembly therein. A blade is fastened to the bolt and forms a hole which aligns with one of two bores through the lock housing when the bolt is in the door locking and door unlocking positions. A conventional padlock assembly of the type having a separate locking loop is used which passes through both of the lock housing bores. Indicia on the padlock assembly lock housing can be provided on its two major face surfaces to designate the state of the lock.

Abstract: A door lock including a housing, a bolt assembly, a lock mechanism engaged with the bolt assembly and capable of being operated to move the bolt assembly from a locked to an unlocked position, and vice versa. The door lock includes a first switch secured to the housing and in the moving path of the bolt assembly, and adapted to couple with an alarm apparatus, for turning on the alarm apparatus when the bolt assembly is moved to the locked position, and for turning off the alarm apparatus when the bolt assembly is moved to the unlocked position.

Abstract: To retain an accessory apparatus including a tape unit, such as a tape deck forming part of an automobile radio, in a vehicle, such as a car or a boat, a dummy cassette (17) is provided, having an externally visible lock (18) which operates a locking bolt (23) which, upon lock operation, deflects from an aligned position with the dummy cassette through a window in the accessory or tape deck housing and through a holding frame (11) or holding strap (30) secured in the vehicle. The windows (27, 27', 27") in the dummy cassette, the accessory apparatus including the tape deck and the frame or strap in the vehicle are in alignment so that the bolt can be passed therethrough, thus preventing removal of the accessory apparatus from the vehicle. Preferably, the lock is so placed that it is visible, so that it will be immediately apparent that the accessory apparatus is locked against removal.

Abstract: A door knob and lock assembly having a pair of knobs, a latching bolt operable by the rotation of the knobs, and a turn button to selectively arrest the movement of the bolt to place the assembly in locked condition. A battery operated electrical circuit including a switch operable by the turn button, and a light emitting diode mounted within the door knobs so as to be operable on locking the door to provide a flashing light visible from the outside of the door.

Abstract: A currency cassette for an automated teller machine is provided with a counter for maintaining a count of the number of times that a currency access door of said cassette has been opened, and is further provided with an interrupt mechanism for prohibiting said count from exceeding a predetermined amount and returning to a zero count. Reset mechanism is provided for disabling the interrupt mechanism to permit the counter to be reset to zero when the cassette is returned from the automated teller machine to a central location for reloading with currency when the currency contained in the currency cassette has been depleted by dispensing through the automated teller machine.

Abstract: An improved door locking and monitoring assembly is provided which is power activated. The assembly comprises a housing disposable in a door frame and defining a passageway which has a bolt slidably disposed therein and lockset means in the door member. A lever is pivoted in the housing. The lever is L-shaped, with a spring biased vertical arm below it. The rear of the latter is urgeable upwardly by a ball to pivot the lever and move the bolt forward into the locked position. The ball is urgeable upwardly by a solenoid actuated plunger. The biased L-shaped arm has the arms thereof pivoted allowing relative angular movement. An extension on one of the arms is forced into an opening in the housing when the bolt is fully extended to lock-set the bolt. When the bolt moves into the locked position, a member on its rear end closes a powered switch to signal this condition.

Abstract: A locking key, designed to preserve an indication of the lock-shifting (opening or closing) operation last performed, has a shank with an extension shaft rotatably received in an adjoining head, the relative rotation of the shank and the head being limited to 90.degree. or 180.degree. by a retaining pin in the head coacting with a part-circular recess on the shaft. The pin and the recess also serve to hold the head in a fixed axial position with reference to the shank. A spring-loaded detent in the shaft or elsewhere inside the head serves to index the two key portions in either of their limiting relative positions.

Abstract: A status indicator for a door lock which is capable of being activated by a tail piece of the door lock has a first linking member which is operatively attached to the tail piece so as to be rotated by the tail piece and a second linking member which attaches between the first linking member and the indicating member. The second linking member translates the rotational movement of the first linking member to translational movement so as to move the indicating member linearly. The indicating member is housed within a housing plate which is attached to the door by the door lock. The indicating member moves within the housing member in response to change of the lock from a locked to an unlocked status and indicates this change so as to indicate the status of the lock, whether it is locked or unlocked.

Abstract: An easily assembled combination lock has improved tumbler wheel construction, combination changing apparatus, and a bi-positional lock cover which selects between spring-bolt and dead-bolt operation. The improved tumbler wheels have two-piece construction, an inner drive member having a projection, groove and stop assembly cooperating with adjacent tumbler wheels, and a gate ring having a gate and improved gripping apparatus for frictionally engaging the gate ring with the inner drive member. The inner drive member has multiple ratchet teeth about its periphery and the improved gripping apparatus includes a pair of diametrically opposed gripping straps integral with the gate ring, in tension, and tangentially contacting the periphery of the inner drive member imparting a predetermined frictional resistance to rotation. Two normal modes of tumbler wheel operation are contemplated.

Abstract: The lock comprises, integrated in the lock (V), mechanical safety means, an electric motor (2), a control module (1), one or more small switches (9) for communicating the position of the bolts (7), one or more detectors (10, 11) for detecting the open or closed state of the door, and the degree of impacts received by the door. The shaft of the motor (2) is parallel to the longitudinal axis of the bolts (7) and the bolts (7) are guided by apertures formed in branches of a U-shaped element (3) and are driven in translation by a driving member (6) but are free to rotate about their axes. The invention is applicable to electronic locks.

Abstract: A lock bar for securing a pair of door panels having lock and hinge edges in a locked position and indicating whether or not the panels are locked, including a pair of elongated hollow holding brackets having a rectangular cross section aligned horizontally and secured to the door panels adjacent the lock edges thereof, and an elongated, hollow, rectangular cross section, cross bolt extending horizontally through the holding brackets.

Abstract: A self-contained door lock with an indicating device visible on the inside surface of a door that can be provided as an adaptor for existing door locks or manufactured as part of the original door lock. The indicating device automatically gives a visible indication at the lock location as to whether the door lock is locked or unlocked. The indicating device automatically works in coordination with the door lock mechanism.

Abstract: A combination lock monitoring system for recognizing and indicating electronically the condition of operation of the lock, the recognition being achieved by photo sensitive means responding to the light reflecting quality of areas on the lock bolt mechanism, the lock drop arm and a combination wheel of the combination lock, the electronic circuit responding through a binary code to the condition of the photo sensitive means, and the indication including a visual display.