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Tension cord burglar-alarm
| Details |
Inventors: Blasucci, Leonard;
Assignee: Fairway Trading, Inc. (Jersey City, NJ)
Primary Examiner: Swann, III; Glen R.
Assistant Examiner:
Attorney, Agent or Firm: Blum, Kaplan, Friedman, Silberman & Beran
Members are attachable to the window or door around which a cord can be stretched, under tension, in the form of a polygon. A switch is positioned within the polygon, said switch being attached by further cords to two of the sides of the polygon. The switch is held under a selected tension and the shape of the polygon is such that an intruder cannot enter through the window or door without disturbing the cord polygon and, thereby, the tension on the switch. The switch is designed to respond to a change in the tension applied thereto, to supply a signal to an alarm system. |
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DETAILED DESCRIPTION A burglar-alarm device includes as an essential feature an off-on switch which can be altered with respect to being in an off state or an on state by a change in the tension applied thereto.
To place the switch under tension, a plurality of cord holders are mounted on the door or window to be protected and a cord is used to connect the cord-holders.
A switch, preferably of the slider type, is joined by the cord, the join being made in such a way that the switch is held under a selected tension.
Change in tension of the switch can be used to cut off or initiate a current through said switch and thereby trigger an alarm.
By the use of transistor circuitry the current required for operation can be held to a minimum so that the switch can be powered by small electrochemical cells as well as from the mains.
Where the region to be protected is a double-hung window at least two of said cord-holders are attached to each section of the window.
The cord-holders may be attached to the surface of the window or door by a suction cup or, where appropriate, by a push pin or other means.
The cord holder can be provided with a groove therearound for receiving the cord or with an aperture through which the cord can be threaded.
In an exemplary embodiment at least four cord holders are provided and the cord attached thereto forms a polygon or loop.
The switch is joined by two sides of the polygon by an additional cord.
The dimensions of the polygon are such, that, in combination with the additional cord and switch, entry cannot be made through the window or door without disturbing the switch and the tension under which it is held.
The switch is preferably of the three-position type and spring-biased so that either an increase or decrease in tension will result in displacement of the switch from an intermediate position, displacement to either side position resulting in triggering of an alarm either by making or breaking a circuit.
It should be noted that the burglar-alarm device of the present invention is adaptable to protecting a hinge window or hinge door by placing at least two of the cord holders on an adjacent wall
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