Sentrol, Inc.

Other

Kentrox Industries, Inc.

Thomas J Holce

Charles M Huckins

Keith E Flint

A magnetically actuated reed switch assembly in which a small permanent helper magnet is attached to a magnetic lead of the reed switch at an end of the reed switch envelope. The lead then may be bent around parallel with a magnetic reed of an encapsulated reed switch. The permanent helper magnet provides an axis of magnetic polarity parallel with the axis of the reed switch, and is magnetized to a level of magnetism which supplies slightly less than enough magnetic flux density to hold the reed switch in a magnetically actuated condition, so that only a small amount of additional flux density needs to be provided. By selecting reed switches within close tolerances and using helper magnets of selected size and strength within close tolerances, satisfactory assemblies may be produced without adjustment of helper magnet position to actuate the switch. The small permanent magnet may alternatively define a bore fitting around the magnetic lead, and may be magnetized after assembly of the magnet and magnetic lead of the switch, thus reducing the amount of time and labor required to manufacture the switch assembly.

Wide gap magnetic reed switch and method for manufacture of same

A connector assembly for effecting mechanical and electrical connection between a portion of a security alarm or similar circuit mounted on a swinging door or window and a portion of such a circuit located on fixed structure adjacent the door or window, including a resilient electrical cable mechanically connecting a pair of terminal housings which protectively cover the cable and terminals at the ends of the cable when the housings are located adjacent one another with the door closed. The housings may also enclose an electrical sensor, such as a magnetically actuated switch and an actuating magnet, electrically connected with the terminals, for connection with a security alarm circuit.

Switch and connector assembly including protective housings for jumper

A connecting and sensing device and a method for its use in a system for electrically monitoring physical security, including a magnetically operated switch, such as an encapsulated magnetic reed switch, and a quantity of ferromagnetic material located in a fixed position relative to the magnetically operated switch. The switch is connected electrically to an alarm system control circuit and is physically restrained by a flexible cable or the like. An actuating magnet may be attached either to an object whose unauthorized removal is to be detected, or to a fixed object. The actuating magnet is held within a holder including a cavity which permits the magnetically actuated switch and ferromagnetic material to be placed in a predetermined location wherein a magnetic field of a desired polarity and strength produces a desired condition in the magnetically operated switch. The switch is retained in the desired location relative to the actuating magnet by the magnetic attraction between the actuating magnet and the ferromagnetic material. Unauthorized removal of the object being monitored by the use of the sensor results in the ferromagnetic material and the magnetically operated switch being pulled away from the actuating magnet, causing the switch to produce an electrically detectable change of state.

Magnetically retained connecting cable incorporating magnetically

A housing for a magnetic reed switch or other electrical component is housed in a compact cylindrical housing. A screw type terminal strip having recessed openings for the insertion of wires is mated to the cylindrical housing by an adapter having snap lugs for engaging flange portions in the recessed openings on one side, and a circular retainer on the other. A tab on the housing cooperates with a slot on the adapter to prevent rotation.

Modular terminal housing

A plunger-operated magnetically actuated switch enclosed in a generally cylindrical housing which may be mounted either within a cylindrical cavity or against a flat surface. A magnetic contact reed switch is housed alongside the guide for a plunger which carries a small permanent magnet. Depressing the plunger moves the magnet sufficiently to operate the magnetic reed switch. Optional plunger length and reed switch location provide for setting the switch in either a normally open or normally closed configuration. A flange is provided for securely mounting the switch unit in a cylindrical cavity. A resilient catch and a pair of mating hooks are provided to attach a flat mounting plate to the side of the housing and permit the switch unit to be mounted against a flat surface.

Plunger-operated switch unit

Explosion-proof housing for electrical circuit components

Latching housing for miniature electrical components

A housing for an electrical circuit component such as a magnetic contact reed switch for use in a security system. Clamps are provided for connecting the electrical component to conductors of the circuit, with apertures in a wall of the housing permitting insertion of the conductors in the proper location relative to the clamps. Clamping screws for securing the electrical connections are accessible only through apertures provided in the opposite ends of the housing. Recessed location of the clamping screws protects against inadvertent or surreptitious short circuiting around the switch. A flexibly attached mounting bracket includes a latch to hold the housing alongside the bracket.

Switch housing having recessed conductor terminals

A take-off connector for connecting part of a security system electrical circuit, such as a metal foil strip conductor mounted on a movable portion of a window to detect breakage of the window glass, to a fixedly mounted portion of the circuit. The separate portions of the take-off connector may be mounted in a plurality of positions relative to one another and include provisions for connecting electrical conductors alternatively on a side which is parallel to or perpendicular to a surface against which that portion of the connector is mounted. Movable contacts are bifurcated flat springs and include convex contact points, while flat fixed contact surfaces are provided on each of two sides of one portion of the connector.

Take-off connector for security circuit

Combined switch housing and integral mounting bracket

An assembly protectively housing an electrical component includes electrical test points connected to the electrical component and accessible by electrical test instrument probes to enable testing of the electrical component while the assembly is physically mounted in an operational location and electrically connected in a circuit. In one embodiment an end of a lead is exposed flush with the end of a rectangular housing. In another embodiment an end of a lead is exposed within a small well defined in an outer surface of the housing. In a third embodiment of the invention openings are provided in a cover portion of a housing to permit test probes to contact electrical circuit conductor terminals protectively contained within the housing.

Switch assembly including circuit test points

A switch assembly which has an actuating magnet, held in one of a plurality of intersecting cavities within a reciprocally movable plunger, and a magnetic reed switch located alongside one another within a switch housing. With the actuating magnet in one position in the plunger the magnetic reed switch contacts remain normally open when the plunger is extended. With the actuating magnet in another cavity in the plunger, the magnetic reed switch contacts remain normally closed when the plunger is extended. The switch housing comprises a barrel including a cavity for receiving the magnetic switch and a guide cavity for receiving a plunger spring and guiding the reciprocal movement of the plunger. A cap of the housing retains a cylindrical roller against the plunger, and permits the roller to move reciprocally between an extended position projecting above the outer surface of the cap and a depressed position, moving the plunger and the actuating magnet carried in the plunger to change the state of the magnetic reed switch.

Plunger operated magnetic contact switch assembly

A unitary housing defining a cavity for protectively containing a fragile component such as a glass encapsulated magnetic reed switch includes a mounting plate and a protective body interconnected by a thin flexible member which extends between one end of the body of the housing and one end of the mounting plate. The mounting plate includes apertures for receiving fasteners. A resiliently flexible loop is attached to the end of the mounting plate opposite the flexible connecting member, and a protuberance is provided on the end of the body of the housing opposite the flexible interconnecting member. When the body of the housing is positioned parallel to the mounting plate, the flexible interconnecting member and the resiliently flexible loop latch together, holding the body of the housing closely adjacent to the mounting plate. The flexibly attached mounting plate may be easily removed from the body of the housing, permitting the housing to be attached to a surface by the use of an adhesive.

Switch housing incorporating flexibly attached mounting plate

Housing for a floor-mounted magnetic contact switch

A telephone line attenuator pad comprises a printed circuit board one portion of which mounts a plurality of resistances each connected in series with a pair of electrical printed circuit conductors. The resistances and mounting portion of the board are potted within a hollow case and the remaining portion of the board, including portions of the printed circuit conductors, projects from the case for removable mounting, in either of two opposing orientations, in an electrical connector to which are connected a plurality of permanent, fixed resistors included in the attenuator network to which telephone line circuitry is connected.

Growing community of inventors

Portland, OR, United States of America

Thomas J Holce