Alarm system for computers and the like
First Claim
1. A motion sensitive warning device, comprisinga first modular circuit including a portable, DC power supply,an electrically operated alarm connected in said first circuit across said power supply,electronic valve means interposed between said power supply and said alarm and operative to be switched selectively between conducting and non-conducting modes, respectively, said valve means being operative when in one of its modes to maintain said alarm deenergized, and being operative when in the other of its modes to cause said power supply to energize said alarm,a second modular circuit having therein motion-sensitive switch means, andmeans releasably connecting said second circuit at one side to said first circuit with said switch means being operative to maintain said valve means in said one mode when said second circuit is stationary, thereby to maintain said alarm deenergized, and being operative to switch said valve means to its other mode, thereby to energize said alarm when said second circuit is subjected to physical movement, andsaid switch means including means connected across said DC power supply and operative to switch said valve means automatically back to said one mode, when after having been subjected to physical movement said second circuit once again becomes stationary.
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Accused Products
Abstract
Several modular circuits are releasably connected to one another and with the plug which supplies AC power to a computer or the like. A first circuit rectifies the AC voltage and applies a DC voltage to one side of a motion sensing circuit, the opposite side of which is connected to a third circuit containing a portable, DC power supply. The third circuit include an electrically operated alarm, and an electronic valve, which normally maintains the alarm deenergized. The motion sensing circuit contains a capacitor in parallel with a mercury switch which, when subjected to sudden movement, closes and switches the electronic valve to a conducting mode, thereby energizing the alarm, provided the equipment has been unplugged so that the AC power has been removed from the first circuit. The capacitor delays the deenergization of the alarm after the mercury switch recloses; and the DC voltage provided by the AC power supply prolongs the life of the portable DC power supply (battery).
42 Citations
14 Claims
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1. A motion sensitive warning device, comprising
a first modular circuit including a portable, DC power supply, an electrically operated alarm connected in said first circuit across said power supply, electronic valve means interposed between said power supply and said alarm and operative to be switched selectively between conducting and non-conducting modes, respectively, said valve means being operative when in one of its modes to maintain said alarm deenergized, and being operative when in the other of its modes to cause said power supply to energize said alarm, a second modular circuit having therein motion-sensitive switch means, and means releasably connecting said second circuit at one side to said first circuit with said switch means being operative to maintain said valve means in said one mode when said second circuit is stationary, thereby to maintain said alarm deenergized, and being operative to switch said valve means to its other mode, thereby to energize said alarm when said second circuit is subjected to physical movement, and said switch means including means connected across said DC power supply and operative to switch said valve means automatically back to said one mode, when after having been subjected to physical movement said second circuit once again becomes stationary.
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10. A motion sensitive alarm device for electrically operated equipment such as computers and the like, comprising
a plurality of modular circuits, means for releasably connecting one side of a first one of said circuits to an AC power supply through the same plug that is used to supply power to a piece of electrically operated equipment, means in said first circuit for rectifying an AC voltage received from said power supply, and for producing a first DC power supply at an output of said first circuit, means for releasably connecting the output of said first circuit to one side of a second one of said modular circuits, means for connecting the opposite side of said second circuit with a third one of said circuits, said third circuit having therein a portable DC power supply the output of which is applied to said second circuit at the side thereof opposite said one side thereof, an electrical alarm in said third circuit, electronic valve means in said third circuit between said alarm and said DC power supplies and operative, when nonconducting, to maintain said alarm deenergized, and operative when conducting to energize said alarm, a normally-open motion sensitive switch in said second circuit operative when open, to maintain said valve means in its nonconducting mode, and means for switching said valve means to a conducting mode when said switch is closed and said one side of said first circuit is not connected to an AC power supply.
Specification