Abstract: A passive home security meter indicator which will show the returning occupant(s) at the front entrance whether or not the front door has been opened and security status compromised. If a security status has been compromised, a D'arsonval Meter Movement will show a repetitive sweeping meter indication visible at the front entrance. This equipment operates on 120 VAC commercial power through an AC ADAPTER as primary power. A set of 4 regular "D" size alkaline flashlight battery and a 6 volt alkaline lantern battery are used as 200% back-up power. For a 5 to 10 hour day operation, a set of 14 ampere-hour (a-h) alkaline flashlight battery may last 5 to 10 months while a 27 a-h alkaline lantern battery may last 9.5 to 19 months. The life expectancy of these batteries is typically from three to four years when a 12 VDC AC ADAPTER is used as primary power.

Abstract: Operating circuits for a solenoid actuated locking means mounted interiorly of a garage door, to provide additional security. The operating circuits are electrically connected to the solenoid operator of a normally closed hasp that cooperates with the garage door in the closed position. The circuits are designed for use with an automatic garage door opener or a manually opened garage door, and include integrated circuit logic, relay logic, or equivalent means to allow opening of the garage door by authorized means, or if a forced attempt is made, or an unauthorized means is used, to open the garage door, when the garage door is in the secured position, the circuitry will activate an alarm, or other security means and prevent the garage door from being opened.

Abstract: A combined alarm system and window covering assembly has a top housing assembly, a bottom housing and a covering. A conductive wire extends from the top housing assembly down to the bottom assembly and up from the bottom assembly to the top housing assembly and is used for raising and lowering the covering and the bottom housing. The conductive wire is electrically coupled to an alarm device. An enclosure is adapted to cover to the top housing assembly and an alarm device is disposed in the enclosure. A rotatable electrical connector and a roll-up mechanism for raising and lowering the covering and the bottom assembly may also be disposed in the top housing. The rotatable electrical connector electrically couples the alarm device to the conductive wire. An optical fiber may replace the conductive wire.

Abstract: A battery alarm system that is capable of recognizing when a child has opened a door by utilizing self contained electronic circuitry with a switch mounted out of reach of the child. If a child opens the door, the horn sounds. If a taller person opens the door, he can prevent the sounding of the alarm by pressing the switch either before or after the door is opened and then closing the door within a preset time. The preset time period may be extended by pressing the button. If the horn has sounded and the button is pressed, closing the door will shut off the horn. The door can also be opened and closed and the switch pressed all within a preset time without the horn being sounded. These features avoid the horn being unnecessarily sounded. When the battery energy is depleted, the horn emits a chirping sound for several weeks. The electronic circuitry allows for very low power drain and permits the battery to last for over a year under normal operating conditions.

Abstract: A monitoring and control system is disclosed which samples a plurality of output ports and lines from the microprocessor and the system electronics of an electronic lock to determine whether the bolt is extended, retracted, or the enabling stepper motor has been activated. The presence of a change key may be monitored and the efficacy of a change key controlled to only permit the changing of the combination of the lock when the central monitoring station approves such a change.

Abstract: An alarm system comprises a pair of interlocking components, which when separated causes an electrical switch operable in response there to change states and activate the alarm. The switch may be either a mechanical type device or a magnetic proximity type device. A cable may be attached to one or both components.

Abstract: A shopping cart security system assists in preventing the theft of a shopping cart from a parking lot of an establishment where the carts are used. The parking lot has at least one entrance and exit driveway. The system includes a magnet mounted on the shopping cart and an actuator buried below the surface of the driveway for generating a signal in response to passage of the cart with the magnet over the driveway. The actuator extends generally transversely with respect to and substantially completely across the driveway. An alarm issues a warning in response to the signal generated by the actuator. Also, a system for monitoring unauthorized entry into a restricted area having a door, a magnet carried by the door and an actuator controlled by the magnet for signalling opening of the door.

Abstract: A display cabinet for storing and displaying merchandise for sale to consumers is provided with one or more doors, each door being locked by a locking mechanism that can be released by a signal from a remotely located, hand-held RF transmitter operated by a store clerk or cashier. Visual and audible alarms are provided for alerting store personnel to forcible entry into the cabinet and for warning store personnel when the cabinet doors have been open for a time period in excess of a predetermined time period.

Abstract: The unauthorized separation of a second member such as a door with respect to a first member affixed to a computer frame and the subsequent replacement of the initial position of the door creates a change of state of a square loop magnetic member integral with the computer frame. This change of state can be monitored from time to time to indicate an unauthorized opening of the door.

Abstract: A magnetic switch assembly (10) is provided for detecting relative movement between first and second adjacent members (14, 18), and to defeat attempted magnetic manipulation of the assembly (10). The assembly (10) includes a pair of adjacent, superposed, upper and lower switch elements (22, 24) adapted for mounting on the first member (14), with the lower switch element (24) presenting a sloped surface (26). A shiftable, ferromagnetic ball (34) is disposed between the elements (22, 24) and movable along surface (26) between spaced upper and lower switch operating positions. A magnet (36) adapted for mounting on the second member (18) is also provided, and is oriented for normally retaining the ball (34) in the upper position thereof; however, upon movement of the member (18), the ball (34) is permitted to shift downwardly along the sloped surface (26) to the lower switch operating position thereof.

Abstract: A batteryless sensor includes a small and concealed permanent magnet motor which operates as a generator to convert rotational or translational energy to an ersatz Vcc transient power supply via a mechanical arrangement to radiate a coded VHF oscillator signal to a repeater or central processing unit located as far as one mile from the sensor. The receiver is able to monitor a multiplicity of sensor units over a given time period.

Abstract: A combined alarm system and window covering assembly includes a top housing, a bottom rail, a covering, a continuous conductive wire which has a first end and a second end and an alarm device. The alarm device has a first input terminal and a second input terminal. The covering is mechanically coupled to the top housing and the bottom rail. The continuous conductive wire extends from the top housing down to the bottom rail and up from the bottom rail to the top housing. The first and second ends of said continuous conductive wire are electrically coupled to the first and second input terminals of the alarm system. The continuous conductive wire is coupled with the bottom rail as a main pull string for raising and lowering the bottom rail and the covering.

Abstract: A security circuit includes a power supply and one or more modular switch units and a modular alarm unit. Each modular unit includes two standard multiple-conductor telephone jack sockets, with at least one conductor of each socket connected to the circuitry of the unit, with all of the other conductors of one socket being respectively directly connected in-line to the corresponding conductors of the other socket. The modular units are interconnectable with standard telephone connector cables having modular telephone jack plugs mateable with the sockets. The power supply may be a battery which may also be provided with modular telephone jack sockets. Alternatively, the circuit may be powered from the RS-232 serial port of a personal computer, the telephone connector cable being coupled thereto through a standard adapter. Different versions of switch units and alarm units are disclosed. Series circuits are terminated with a spiral terminator plug.

Abstract: An anti-intrusion window is disclosed comprising a window frame assembly adapted to be attached to a building structure, first and second sash assemblies supported by the frame assembly and relatively movable with respect to each other, a position indicator supported by one sash, a sensor supported by the other sash and an alarm signal generator activated whenever the position indicator and the sensor are at least momentarily adjacent each other. Multiple windows are coupled to a second alarm signal generator which produces an audible alarm when the first alarm signal generator transmits an alarm signal. The sashes may be moved into cleaning positions without triggering an alarm.

Abstract: An alarm system includes an electrical energy source; an alarm for producing an alarm signal when electrically coupled to the electrical energy source; a switch for movement from a first position to a second position upon the occurrence of the monitored event; and timing circuitry for being activated when the switch is moved from the first position to the second position, for electrically coupling the alarm to the electrical energy source, for continuing to electrically couple the alarm to the source of electrical energy for a set period of time even if the switch is subsequently moved back to the first position during the set period of time, for deactivating the alarm a certain period of time after the alarm is activated, and for reactivating the alarm a certain period of time after the alarm is deactivated if the switch remains in the second position.

Abstract: A multi-function car door closure warning sensor includes a main module secured to a car door adjacent to an edge thereof, and an auxiliary module secured to the car body and adjacent with the main module, when the car door is in a closed position. A battery, a first soft magnetic pole piece with an attached normally closed magnetic switch, a buzzer, two sets of L.E.D.'s, and an L.E.D. control circuit are disposed within the main module. A permanent magnet with an atached second soft magnetic pole piece are disposed within the auxiliary module. Whereby, when the door is properly closed, the first and second soft magnetic pole pieces are aligned and separated by a small gap. The permanent magnet induces a magnetic field in the first pole piece which causes the magnetic switch to open. When the car door is not properly closed, no magnetic field is induced in the first pole piece causing the magnetic switch to close, activating the buzzer and L.E.D. control circuit, which causes the two sets of L.E.D.

Abstract: An alarm system for signalling when a door of a refrigeration unit compartment is not fully closed comprises an alarm condition sensing system having a door sealing gasket magnet and a magnetically actuated switch. The gasket magnet produces an elongated narrow magnetic field for coupling the unit and the door in sealing relationship when the door is fully closed. The switch senses the magnetic field when the door is closed even though the magnet position may be anywhere in a band of possible positions. An alarm system signals when a door of a refrigeration unit compartment is not fully closed. The alarm assembly comprises a housing wall section, a vibratable alarm member, and mounting structure for connecting the alarm member to the housing wall section so that the housing wall section is driven by the member and vibrates relative to the housing when the member vibrates at an operating frequency. A plainly audible alarm is produced when a door ajar condition is sensed.

Abstract: An alarm system for signalling when a door of a refrigeration unit compartment is not fully closed comprises an alarm condition sensing system having a door sealing gasket magnet and a magnetically actuated switch. The gasket magnet produces an elongated narrow magnetic field for coupling the unit and the door in sealing relationship when the door is fully closed. The switch senses the magnetic field when the door is closed even though the magnet position may be anywhere in a band of possible positions. An alarm system signals when a door of a refrigeration unit compartment is not fully closed. The alarm assembly comprises a housing wall section, a vibratable alarm member, and mounting structure for connecting the alarm member to the housing wall section so that the housing wall section is driven by the number and vibrates relative to the housing when the member vibrates at an operating frequency. A plainly audible alarm is produced when a door ajar condition is sensed.

Abstract: An anti-intrusion window is disclosed having a sash assembly which is movable along two paths; one for ventilating and one for cleaning the sash. A sensor is supported by one of the window frame or the sash assembly and a position indicator such as a magnet is supported by the other. The sensor detects the momentary presence of the position indicator to trigger an alarm. The sash assembly is movable through a range of ventilating positions without triggering the alarm while the alarm is armed. The sash may be moved into a cleaning position without triggering the alarm while the alarm is armed.

Abstract: An electrically conductive security screen includes an electrical resistance sensor and alarm to detect tampering with the screening material of a window. An elongated path of flexible and electrically conductive coating composition is applied to the screening material in a predetermined and non-overlapping pattern, such that a closed circuit loop is formed when it is attached to the sensor alarm; the coating having an electrical resistance that varies when it is distorted or its path interrupted. The pattern having a marginal section of high electrical resistance and being in series with at least one switch.

Abstract: A security alarm system includes a transponder having a housing enclosing both a sensor and associated circuit means in a unitary package. The housing base includes barrel-shaped connectors, and a pc board carrying the communications components is carried by the housing cover. Flag-like connectors mate with the barrel-shaped connectors when the cover is attached to the base, and the connectors give both good mechanical indexing and retention, and effective electrical contact. Removal of the cover from the base breaks the electrical contact and thus breaks continuity back to the system controller, indicating someone has tampered with the system.

Abstract: A combination illuminated entry and door lock switch for a vehicle door lock assembly which provides voltage signals to a single wire bus and smart sensor multiplex control system for controlling turning on interior lights of the vehicle when a door handle is operated and for disarming a vehicle alarm system when a door key is turned in a door lock cylinder. Another embodiment includes a keyboard mounted in a cavity of the door handle assembly which permits sending voltage signals over the single wire bus to the smart sensor multiplex control system to control a variety of drivers and other control devices.

Abstract: Alarm system for multi-compartment, postal mailbox arrays incorporating a plurality of individual mail compartments contained behind a primary access door. The system comprises an alarm secured adjacent the mailbox array and coupled thereto by switches coupled to each access door and to the postal lock for that door. The postal lock is modified with an aperture which exposes the internal operation thereof for a switch mounted thereon. In this manner authorized actuation of the lock disengages the alarm system to prevent it from sounding when the access door is opened. Forced opening of the access door without first disengaging the system through the postal lock will otherwise set off the alarm. In this manner a number of access door switches may be coupled to a single alarm box which itself may be constructed for preventing unauthorized deactivation by the utilization of similar switch sensors disposed therein.

Abstract: A security system for use in a physical security monitoring environment includes a switch unit having a common conductor, a guard conductor and at least three switches. Each of the switches has a deactivated condition and an activated condition and each is adapted to be placed in its activated condition in response to a magnetic field of predetermined magnetic flux. The switch unit also includes a logic circuit electrically interconnecting the switches and the common and guard conductors, the logic circuit completing a series circuit between the common conductor and the guard conductor whenever at least two predetermined but not all switches are in magnetically actuated condition.

Abstract: A surveillance installation to protect an area of ground. A number of sensing units are spaced around the perimeter of the area to be protected. Each sensing unit comprises a network of strands inconspicuously deployed over a portion of the ground and connected to a magnetically operated switch. When an intruder trips one of the strands, the magnetic switch is operated to signal the presence of an intruder. A central monitoring unit powered by a low voltage D.C. supply connects the various sensing units by means of a two-wire circuit. The central monitoring unit includes signalling devices to indicate the location of the intruder. The system also has the capability of initiating intruder warning devices.

Abstract: An interlock switch for the service door of a computer. The switch prevents power from being automatically resupplied to the computer if the door is opened while power has been interrupted, even if the door is subsequently closed. The interlock switch includes a magnetic reed switch, an electromagnet for closing the reed switch contacts when the power-on switch of the computer is actuated, and a permanent magnet which holds the reed switch contacts closed as long as the service door has not been opened. The reed switch and electromagnet are mounted on the frame of the cabinet of the computer. The permanent magnet is mounted on the edge of the service door adjacent the reed switch. The use of the switch in a security system is also disclosed.

Abstract: A door status detection system is provided for use in a refrigerator having a cabinet defining first and second food storage compartments and corresponding first and second doors hingely mounted to the cabinet for selectively closing the compartments. The doors each include a magnetic sealing strip secured thereto for sealing the doors to the cabinet and for maintaining the doors in closed position. First and second switch arrays are installed into the cabinet generally adjacent a section of the magnetic sealing strips of the first and second doors, respectively, when the doors are in closed position for signaling the opened/closed status of the doors. The first and second switch arrays are electrically connected in series and operated by the magnetic sealing strips of the doors. Circuitry is connected to the first and second switch arrays for signaling a user of the refrigerator if either of the doors remains in an opened position for a defined period of time.

Abstract: A portable door alarm is used in such environments as hotel rooms and the like. The alarm has a housing containing the alarm mechanism with a front face on which the alarm controls are mounted. The housing is suspended from the shank of a door handle by a locking clamp connected to the housing by a hinge. The hinge allows the housing to be pivoted upwardly so that the alarm controls can be manipulated from a standing position. The activation of the alarm is with a two component switch. The components of the switch are mounted on the door frame and the door in adjacent positions. The door mounted switch component is connected to the alarm mechanism in the housing with a relatively long flexible electrical wire. The arrangement is such that when a door is opened, the switch circuit opens and the alarm is activated.

Abstract: The contacts of an electrical switch, such as a magnetic contact reed switch or a magnetic contact reed relay used in a burglar alarm system, are protected from being fused together by transient current surges. This protection is accomplished by providing a normally nonconductive shunting path in parallel with the switch. The shunting path includes a voltage responsive device which is biased to conduction in response to a current surge to thereby complete the shunting path and allow the current surge to bypass the switch.

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: A door annunciator briefly sounds an alarm when a door opens but not when the door closes. When the door begins to open, a reed switch makes a connection so that an electrical current resulting from a change in the amount of electrical charge stored in a capacitor triggers an electronic alarm chip and thereby causes the alarm to sound. When the door closes the switch connects the capacitor to restore its original level of charge. The components are installed in a small self-contained enclosure adjacent the door, and a permanent magnet to operate the reed switch as the door opens and closes is installed on the door.

Abstract: The sound producing device is composed of three independent parts: (1) a push-button for generating a sound-wave; (2) an assembly comprising a sound-wave sensing switch, a magnet and magnetic-reed switch, an integrated circuit amplifier and a door bell; and (3) a fixed magnet. The three parts have their own self-sticking glue, so that no wire is required when installed, and it can be adhered on the front of the door, inside the door, and by the side of the door frame, respectively. Dry cells may be located in the interior of the assembly. The device serves several functions because it notifies people (1) that the door is not well closed, (2) that a burglar is trying to get into the house and (3) it serves the normal function of a door bell.

Abstract: The monitoring arrangement consists of permanent magnets (M1, M2, M3) of different strengths which are associated with a closure mechanism. Combined in a structural unit (1), these act as signal transmitters. The structural unit (1), is, for example, so positioned in door leaf that, in the closed position of the mechanism the permanent magnets (M1, M2, M3) lie opposite sensors (S1, S2, S3) which are associated with a surrounding frame. These sensors combined in a structural unit (2), act as signal pick-ups, at which different voltages, which are increased by amplifiers V1, V2, V3, are applied as a result of differing magnetic field strengths. The output voltages thereof are adjustable by respective potentiometers and can be regulated to the threshold voltages of comparators (K1to K6).

Abstract: A metal detector is proposed, in which field coils and receiving coils are arranged on either side of a zone to be monitored. In order to bring about a more uniform sensitivity distribution within the zone to be monitored, alternately the field coil on one side and the field coil on the other side is excited for radiating a magnetic field.

Abstract: The invention relates to a system for detecting the incomplete closure of the doors of a chamber with at least two doors (14, 16), one an inner door and the other an outer door, arranged one behind the other in front of an orifice of the said chamber and mounted pivotally between an open position and a closed position about two parallel pivot axes (18, 24) respectively.The detection system comprises an active element (34) capable of causing an action in a particular direction and a sensor element (36) sensitive to the said action, the said elements being fastened one to the inner door (14) and the other to the outer door (16) at a point located opposite the other element, in such a way that the sensor element is in the line of action of the active element only when the two doors are closed correctly.

Abstract: A door closer which is capable of issuing a selected sound or remaining silent when the associated door is opened and which can be mounted on an existing door opener mechanism. Two covers are provided which are mounted on opposite ends of a door closer mechanism body. One of the two covers carries a speaker, while the other carries a sound generating circuit, sensors, and a changeover switch. The changeover switch is used for selecting among, for instance, an alarm sound, a melody chime, and silence. An operating lever for the changeover switch extends through the cover to the outside for ease of selection.

Abstract: A cordless remote controlled burglar proof device including a transmitter and a receiver, wherein the transmitter is controlled by a reed switch corresponding to a magnet. The reed switch and magnet are installed at door/window wing and frame respectively. When the reed switch senses the magnetic field of the magnet, then the circuit remains passive. As soon as the door/window is opened, the reed switch is no longer activated by the magnet, the transmitter is triggered to transmit an ultra high frequency electromagnetic signal to trigger lighting device or alarm upon receipt of the signal by the receiver.

Abstract: Call switch for use by hospital patients and staff members to summon aid in wet areas such as shower and bath areas. An actuating magnet is positioned on the front side of a waterproof panel for controlling the operation of electronic circuitry mounted in a dry area behind the panel. The magnet is carried by a slide for movement between rest and tripped positions, and a pull cord is connected to the slide by a breakaway member which permits the cord to separate from the slide when a patient becomes entangled in the cord or the pull on the cord otherwise exceeds a predetermined limit.

Abstract: A concealable burglar alarm system for automatically generating a warning in response to either unauthorizd opening of a window or breakage of the associated window pane. The system includes a translucent, generally rectangular sending unit which is adapted to be permanently secured upon a window sill adjacent to a window being monitored. The sending unit includes a generally planar mounting base, and an associated magnetic reed switch having a stationary portion and a pivotally deflectable portion. Relative displacement between the reed switch moveable portion and the stationary portion causes an electrical circuit to close, activating a remotely disposed electronic circuit. The base of the sending unit preferably includes an integral, outwardly extending cylindrical projection upon which the coiled portion of a reed switch activation spring is mounted and flangeably secured. The spring includes a pair of outwardly extending first and second ends which are biased apart.

Abstract: An electro-mechanical auxiliary knob structure, releasably attachable to a rotatable knob of a valve, to annunciate an open condition of that valve operated thereby. The auxiliary knob pivots relative to its attachment structure to switch electric circuitry carried within the auxiliary knob to annunciate last knob motion in the direction causing valve opening. The auxiliary knob is particularly adapted for use on valves of compressed gas tanks used in gas welding.

Abstract: A tamper resistant device is disclosed for dependably indicating when a door or other shut off means has reached a closed position. The device includes a series of transmitting and receiving elements brought into juxtaposition during or at the final closing movements of the door. The device may include read out means responsive to the sequence of activation of the receiving elements and/or the identity of the receiving elements activated.

Abstract: An alarm sensor apparatus for closures such as doors and windows, and particularly for closures having loose tolerances such as overhead doors, garage doors or the like, the sensor apparatus comprising a pair of cooperating bracket members, one being attached to the door facing or frame work and the other to the door member, two magnetic sensor elements carried by said bracket members, the bracket members comprising a pair of cooperating orthogonal guide slots and plates and a stop member engageable with one of the sensors for aligning the sensors with respect to each other in all three orthogonal planes when the door is closed.

Abstract: An electrical interlock to prevent unauthorized access to potentially hazardous equipment and an associated detection circuit to detect if a safety shield or closure member is open, not securely closed or has been tampered with and to thereupon automatically de-energize the equipment. The detection circuit may comprise a balanced bridge incorporating the electrical interlock into a leg thereof and may also provide a visual or audible indication whenever the bridge is unbalanced thereby indicating an improperly closed safety shield.

Abstract: A work station is designed for use with electronic equipment whereby the placement of the equipment in the work station prevents undesired electromagnetic coupling between various pieces of the electronic equipment. A substantially horizontal work surface is provided between a cabinet at one end and a safe at the other end. The cabinet provides a Faraday cage for receiving a MODEM and for preventing the passage of electromagnetic radiation, whereby undesired coupling between the MODEM and other pieces of electronic equipment is substantially precluded. The safe is designed to house an encryption device. A horizontal work surface supports electronic input equipment, such as a word processor, in position for convenient use by an operator. The electronic equipment on the work surface is connected to the encryption device in the safe which is, in turn, connected to a modulator-demodulator (MODEM) in the cabinet.

Abstract: The method and device employs detectors which are connected to electronic analyzers which, in accordance with the level of detection, actuate the corresponding level of alarm and the level of dissuasion by choosing the suitable timing and the suitable power circuit. The alarm is progressive and dissuasive so as to inform a provoker on the spot, in the region of the openings to be protected, that the system has detectors connected to an alarm center which is capable of analyzing the items of information coming from the detector or detectors and immediately actuating a specific and understandable alarm. The method and device are applicable to the supervision and protection of premises.

Abstract: An electrical system is provided for attachment to basement windows or the like for the purpose of sounding an alarm automatically if the window is opened and the device is moved or tampered with. The system comprises a spring-loaded bar or a tube within a tube which is placed in the window frame without the need for screws, adhesive or other fastening means. When installed and spring-loaded, the assembly holds an electric switch in place against the side wall of the window. If the assembly is jarred or moved the switch is released, the electrical connection is either made or broken and an alarm is sounded.

Abstract: Magnetic door locks characteristically include a high strength electromagnet and a mating plate made of magnetically permeable material, or door strike, mounted on the door frame and the door, respectively. In addition, in order to determine whether the door strike is in engagement with the electromagnet, detection arrangements are provided; and in the present case, simplified detection arrangements are provided by separate portions of the electromagnetic core separated by non-conducting shims or the like, and the closing of a detection circuit extending between the two portions of the electromagnetic core by the magnetic and electrically conducting door strike bridging between the two sections of the core. In addition, the detection circuit may be electrically connected in parallel with electromagnet energization circuit, to positively indicate both that the electromagnet is energized and that the door is closed.

Abstract: A housing for an elongate electronic circuit board, including longitudinally extending support rails and opposing pins within the housing to support the margins of a portion of the electronic circuit board which is not deformation-sensitive. A recess is provided on the exterior of the housing to hold electrical power cells therein, thus separating them from the circuit board. An opening to the interior portion of the housing provides access to a portion of the circuit board.

Abstract: An alarm system has its components completely concealed in the extruded framework of a window or door for actuation by a magnet mounted in a moving member with the alarm switch being a magnetically biased proximity sensor.Latching means are provided for maintaining the switch contacts closed after being initially closed by the actuating member. The system may include a ferrous shield for insertion between the framework and window to disable the alarm system so that the window may be moved by authorized personnel.

Abstract: A door status detection system is provided for use in a refrigerator having a cabinet defining first and second food storage compartments and corresponding first and second doors hingely mounted to the cabinet for selectively closing the compartments. The doors each include a magnetic sealing strip secured thereto for sealing the doors to the cabinet and for maintaining the doors in closed position. First and second switch arrays are installed into the cabinet generally adjacent a section of the magnetic sealing strips of the first and second doors, respectively, when the doors are in closed position for signaling the opened/closed status of the doors. The first and second switch arrays are electrically connected in series and operated by the magnetic sealing strips of the doors. Circuitry is connected to the first and second switch arrays for signaling a user of the refrigerator if either of the doors remains in an opened position for a defined period of time.