Abstract: A combination door lock and alarm has an upper end clip engageable with the door handle, a shaft extending in an adjustable length tube and terminating in a non-skid rubber end adapted to engage the floor or carpet. The clip at the upper end of the shaft is angularly mounted and has its lower end lying in a plane substantially aligned with the longitudinal axis of the shaft. An alarm device is also mounted on the shaft and includes an actuator for it with a switch contact normally abutting or close to abutment with the surface of the door at a point below the door handle. Responsive to inward movement and pressure on the door the alarm will be actuated. At the same time, the locking action of the shaft and clip will divert the opening inward forces into forces directed against the floor so that the door cannot be opened.

Abstract: This intrusion alarm apparatus has a housing suspended from a metal doorknob such that the housing is tilted when the doorknob is turned. A 100 kHz. oscillator is synchronized with a single shot which produces narrower pulses than the oscillator. An exclusive OR circuit subtracts the single shot pulses from the oscillator pulses. When the door is of wood or other electrically non-conductive material, the body capacitance of a person touching the doorknob increases the width of the pulses produced by the single shot and this change is reflected through the exclusive OR circuit, an integrator, a level detector and a flip-flop to turn on an audible alarm device. When the door itself is metallic, a selector switch can disable the alarm device from responding to the body capacitance of a person touching the doorknob, in which case the tilt switch in the housing will turn on the alarm device when the doorknob is turned.

Abstract: The present invention provides an early warning sound alarm system for signalling unauthorized entry or attempted entry through a pet door when the pet door is covered and not in use. The alarm system in accordance with the invention, comprises in combination: a pet door including a frame defining a passageway therethrough, and a flap swingably mounted on the frame adjacent the upper edge of the passageway for swinging movement in either direction therethrough; a covering member removably secured to one side of the frame adjacent the flap for preventing entry through the passageway; and an electrically powered sound alarm, including a sound signal box, and a switch such as a leaf spring biased limit switch disposed between the flap and the surface of covering member adjacent the flap. The switch is suitably positioned to maintain the sound signal box in a deactivated state when the covering member is secured on the frame to prevent entry through the passageway.

Abstract: There is provided an alarm, which includes a mounting base, and means for securing the mounting base to an item whose movement is to be signalled by the alarm. A magnetic reed switch constitutes a first element, and a magnet constitutes a second element. One of these elements is mounted on a pivotal member capable of pivoting with respect to the mounting base, while the other of the elements is capable of retaining a given position with respect to the mounting base.

Abstract: A self-contained pre-intrusion detection and alarm system for doors and other closures, the system including an rf oscillator circuit incorporating a tank circuit which includes an antenna. The system also includes a detection and processing circuit effective to detect and amplify a change in the voltage in the rf oscillator circuit caused by a change in the antenna to ground capacitance; an audio oscillator circuit; time delay circuitry connected between the detecting and processing circuit and the audio oscillator circuit and controlling the energization of the audio oscillator circuit; and an alarm electrically connected to and controlled by the audio oscillator circuit for alerting occupants of potential danger of intrusion and also deterring potential intruders from continuing their activities toward intrusion.

Abstract: Portable, self-powered multiple warning device, including an alarm clock, a smoke or gas detector, a common power source for powering the alarm clock and smoke or gas detector, first warning means for issuing an activation signal for the alarm clock and second warning means for issuing an activation signal for the smoke or gas detector.

Abstract: An intrusion alarm is provided in a compact enclosure permitting its movement from location to location as needed. The alarm includes one or more motion detectors, some of which may be battery operated, one or more alarm devices, such as horns, sirens, etc., door switches and appropriate relays for operating the system. A battery back up system insures that the alarm is always activated.

Abstract: A sensor alarm has a sensor for detecting heat, smoke, noxious gases, and the like and an alarm for warning of an alarm condition coupled to the sensor. The sensor alarm is attached to a support plate. An angled arm is formed at the upper edge of the plate to provide an inverted channel-shaped member fittable over a door top and having stiffly resilient pads for forcibly cocking the door top open, when the door is closed and latched, to provide a path for gaseous passage so that room occupants are provided with an early warning of an alarm condition.

Abstract: A battery operated personal alarm having a withdrawable actuating pin extending from the case thereof is provided with a multi-purpose handle attached to the exterior of the case, permitting attachment of the alarm to the person or purse-handle of a user in a first position, and in a second position permitting attachment of the alarm to a door handle for use as a portable burglar alarm. Removal of the handle from its inverted keyhole shaped aperture on the back of the case permits the hanging of the alarm from a screw head or a nail head attached to a fixed support, the actuating pin being attached by a lanyard to a relatively moveable object, for displacement thereby.

Abstract: An alarm device responsive to vibration includes a unitary housing in which is disposed an SCR for connecting an alarm signal to an associated source of power, the gate of the SCR being connected to a pendulum and ring assembly with the pendulum being normally suspended within the ring out of engagement therewith but which moves into engagement with the ring when the housing is subjected to vibration to apply power to the SCR gate so that the SCR conducts to actuate the alarm signal for indicating the application of a vibration to the housing or a supporting structure on which the housing is mounted. The alarm device may also include timing circuitry which deactivates the SCR after a predetermined period of time.

Abstract: A portable alarm device adapted to be actuated upon the movement of a door, a window, or other movable object. The alarm device includes a slidably supported actuating rod adapted to be engaged or moved by the movable object and that electrically closes a switch in order to energize both a light assembly and a bell assembly in the alarm device. A manual switch permits the light assembly to be operated independently of any movement of the rod so that the alarm device may be used as a portable flashlight or lantern.

Abstract: A portable alarm consists of a unit which emits an alarm signal when it is tilted to a predetermined extent from its upright position, and having a base support which will support the unit in a condition of unstable equilibrium, and a stay which, when the unit is stood substantially upright near to a door, for example, may be rested against the door to impart stability to the unit, which will fall from the upright position and emit the alarm signal if the door is opened to move the stay.

Abstract: An alarm device which includes a housing, batteries in the housing, conductors and a light source and an audio signal in parallel to one another and connected to the batteries and switch means between the light source and the audio signal, in series therewith, and normally opened, yet adapted to be closed by movement of the switch to cause, optionally, a light or an audio signal and, alternatively, an attachment for the housing to provide an alternative circuit with a switch in it which is activated by heat, or by closing to a normal position upon release under predetermined conditions to override the signal and to cause an audio signal to warn a person that an intruder has entered a room or that the heat within a given location exceeds a certain predetermined amount.

Abstract: A portable, self-contained protection device includes a battery operated combustion product sensor and intrusion switch, providing energization to an audible warning device, all contained in a casing adapted to be mounted, for example, such as on a door. A spring biased retainer maintains the warning device in its mounted condition. Two forms of intrusion switch are disclosed, both of which have opened and closed conditions. When the warning device is mounted on the door, and the door is closed, the intrusion switch is maintained open, however when the door is opened, the intrusion switch closes, providing energy to the audible warning device. The combustion product sensor, likewise, provides energy to the audible warning device, upon sensing products of combustion. Auxiliary devices include an optical indicator issuing a light signal whenever the audible warning device is actuated. An external actuator may also be employed to actuate the warning device.

Abstract: A portable, miniaturized, self-contained audible alerting device is disclosed. The device is housed in a small case adapted to be positioned in a darkened enclosure, such as a medicine cabinet, for receiving light when the enclosure is opened, producing an audible signal after a predetermined time delay for altering a person some distance from the enclosure that the latter has been opened, e.g., by a child. Within the case is a photodetector positioned with respect to an aperture of the case which receives light upon opening of the enclosure. Also within the case is a time delay circuit responsive to the photodetector, a first oscillator controlled by the time delay circuit, an amplifier circuit and a transducer, for providing the audible alerting signal only after the time delay. A frequency control circuit, comprising a lower frequency oscillator, causes an output signal of the first oscillator to change repeatedly between upper and lower frequency limits.

Abstract: A compact portable housing encloses a piezoelectric element which receives short pulses from a pulse generator circuit controlled by a ramping waveform generator circuit so that the element and the adjacent speaker portion of the housing produce a frequency modulated loud sweeping sound. The housing also encloses a detector switch for sensing a disturbance, and the sensitivity of the switch may be adjusted according to the position of the housing. The detector switch actuates a timer circuit which is armed or disarmed by moving a combination code switch having code wheels projecting from the housing.

Abstract: An intrusion alarm system utilizes an inertially responsive sensor preferably present as a pendulum actuated reed switch. Logic circuits provided within the system provide, an efficient pulsating alarm at dual frequencies optimized for human recognition. In both arrangements, a unique dual delay arrangement is provided, one delay commencing with the arming of the device to permit adequate time for the setting of a sensing switch. A second delay arrangement is provided at the option of the operator for purposes of delaying the activation of the alarm once the sensor switch has been tripped. This feature may be utilized to permit entrance through a door or the like upon which the unit is mounted wherein the device can be deactivated prior to assuming an alarm sounding condition.

Abstract: A strip of conductive spring material is formed in a loop with extending ends adapted to be clamped together by closed doors and windows. In one embodiment, a conductive rod member has a hook at one end, the other end of the rod member being fixedly connected to one side of the loop, the hooked end extending through a hole in the other side of the loop. An apertured contact member is mounted on and insulated from the outside of the other side of the loop. The loop is unclamped when the door or window is opened and a circuit is completed between the hooked end and the contact. In another embodiment, the loop is positioned between two stationary contacts, being permanently attached to the first one of the contacts. When the extended ends are clamped, the loop does not touch the second contact, but when the ends are unclamped, the loop bridges the two fixed contacts to complete an alarm circuit.

Abstract: A jack in accordance with the present invention includes a plurality of contact springs that are arranged in a row side by side one another and extend rearwardly cantilever fashion within a plug-receiving cavity. It further includes a switch disposed on each side of the connector contacts. Each switch comprises a movable contact spring that is normally in engagement with a stationary contact spring. The movable contact springs extend within the plug-receiving cavity while the stationary contact springs are remote to the opening.The jack is intended to be connected to a telephone line by respectively wiring the switches in series with the ring and tip conductors and wiring an individual connector contact in parallel with each of the switch contacts. Continuity in the telephone line is then provided by the closed switches of the jack when no plug is inserted into the jack.

Abstract: A multi-purpose radio of the AC or battery operated type which includes connections for an auxiliary unit which is an alarm device of the ultrasonic type in which the transducers of the alarm device are mounted on the radio cabinet. The output of the alarm device is applied to the audio frequency amplifier section of the radio.

Abstract: An improved door alarm which is mounted on the inside of a door adjacent the hinged edge thereof sounds an audible alarm when the door is opened. A housing containing a buzzer and a battery is mounted on the door by a pressure-sensitive adhesive. An arming lever is pivotally mounted on the housing and together with a conductor extends outwardly therefrom and operatively engages an actuator block which is mounted on the door frame adjacent the alarm housing. The lever and conductor are operatively connected with the battery and buzzer to form an alarm circuit which will actuate the buzzer when brought into contact with each other at the actuator block. The actuator block has an insulated shelf with which a hooked end of the arming lever is engaged when the alarm is armed and an alarm actuating zone wherein the lever end disengages the shelf and engages an end of the conductor located therein to complete the alarm circuit and actuate the buzzer.

Abstract: A burglar alarm provided with a housing which contains a bell assembly and a battery compartment connected in series with a switch assembly having a linearly movable element which can be displaced a predetermined threshold distance by a chain extending to a magnet temporarily joined to a metal bracket attached to a movable surface. The switch assembly contains a pivoted contact which moves against a fixed contact when the linearly movable element is displaced a predetermined distance, and remains there regardless of the subsequent position of the linearly moveable element until a button operationally connected to the switch assembly is moved to the "off" position. The bell assembly includes a motor having a clanger support mounted on its shaft, the clangers being loosely mounted on the clanger support so that they can strike the bell without impeding the rotation of the motor.

Abstract: A burglar alarm is disclosed which detects the unauthorized opening of a door or window. The device has a longitudinally adjustable rod which extends between the burglar alarm and the moveable portion of a closed door or window. An attempt to open the door or window activates the burglar alarm causing the alarm to sound. A built in detent within the burglar alarm holds the alarm in the "on" position until manually released. A releasable locking fabric mounts the alarm to an adjacent stationary door or window frame. The alarm is readily separated by hand from the releasing locking fabric for easy opening of the door or window in the event of an emergency requiring a rapid exit.

Abstract: An intrusion detection unit comprises a compacitance having an "active" field, the coupling of which is significantly increased when an intruder comes into conductive relation with a doorknob. The unit is hung on the inside doorknob and is so arranged that the doorknob is the transmitting element of the capacitor, while a separate plate is the receiving element of the capacitor. The capacitor field is maintained actively charged by a battery driven oscillator which operates at a substantially uniform frequency and amplitude. The intrusion detector circuit is complete in itself and is not externally grounded by the intruder. The signal receiving portion of the circuit incorporates a square law amplifier, and also has means for adjusting the reference level to which the signal is compared.

Abstract: A tamper-proof security alarm system comprising basically a radio transmitter unit to be located at equipment which is to be protected, and a radio receiver unit with alarm and control circuits located at a point remote from the transmitter. The transmitter unit comprises a unique, wholly self-contained, small portable sensing and triggering assemblage constructed in a novel manner by which it is completely, 100 percent tamper-proof. The sensing and triggering assemblage employs an ultra-sensitive, gravity-responsive electrical switch connected to energize the transmitter, said switch incorporating a suspension system with reset means whereby the switch can be properly oriented to take care of various angularities of the supporting surface on which the assemblage is placed. The reset means clamps the switch in any of an infinite number of oriented positions. Whenever the unit is moved, however slightly, the switch closes and energizes the transmitter.

Abstract: A portable, miniaturized, self-contained audible alerting device is disclosed. The device is housed in a small case adapted to be positioned in a darkened enclosure, such as a medicine cabinet, for receiving light when the enclosure is opened, producing an audible signal after a predetermined time delay for alerting a person some distance from the enclosure that the latter has been opened, e.g., by a child. Within the case is a photodetector positioned with respect to an aperture of the case which receives light upon opening of the enclosure. Also within the case is a time delay circuit responsive to the photodetector, an amplifier circuit and audible signalling circuitry, including a transducer, for providing the audible alerting signal only after the time delay. The time delay prevents the alerting signal from being given if the enclosure is opened and then closed quickly enough by a person knowing of the device, e.g., the parent of the child.

Abstract: An alarm device is provided comprising a portable housing having an audio alarm positioned therein and a battery powered electronic circuit for activating the alarm. The circuit comprises a battery, an arming switch, a triggering switch, an audio alarm, and a latching circuit and oscillator circuit utilizing an integrated circuit therein. The circuit also includes a means for connecting auxiliary devices thereto and a means for coupling an AC adapter. A magnetically operated reed switch and a mechanically operated pull switch comprise the normally open triggering switch. The triggering switch also contains means for adapting any activator wired normally open to the triggering switch. The oscillator circuit drives the audio alarm whenever any of the triggering switches are closed and the latching circuit maintains the oscillator in an operating mode.

Abstract: A plunger switch is releasably held against the inner surface of the outer section of a double-hung window or sliding door; by a suction cup, in an exemplary embodiment. Movement of the inner section with respect to the outer section dislodges the suction cup, releasing the switch and allowing it to close. Closure of the switch actuates a signalling means to generate an alarm signal.

Abstract: A portable flashlight burglar alarm apparatus has a flashlight with an annunciator attached thereto and powered by the flashlight batteries. The flashlight may be placed adjacent a door and the burglar alarm circuit enabled so that opening the door knocks the flashlight over to actuate the annunciator.

Abstract: A burglar alarm apparatus is provided with a housing adapted to slide over a door knob for actuation upon rotation or attempted rotation of the door knob. An insert is provided for insertion into the housing which has a protruding suction cup so that the door knob burglar alarm can be converted for use on windows or sliding glass doors or the like. The burglar alarm has a sensor switch of the platform and ball type, which is resettable and may be turned off by a single switch knob.