REMOTE ALARM SYSTEM
First Claim
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1. A portable alarm system comprising in combination:
- a housing adapted to support the alarm system;
means for mounting said housing in a predetermined attitude irrespective of the oRientation of the surface to which the housing is mounted;
indicating means on said housing adapted to indicate when said housing is in said predetermined attitude;
an acceleration sensitive switch means in said housing, said switch means resting in a nonconducting position when said housing is in said predetermined attitude;
activation means;
a relay means operable to be activated by said activation means and said switch means;
radio transmitting means adapted to have its output signal modified by said relay means when said relay means is activated;
radio receiving means operable to sense transmissions from said transmitting means and modifications thereof at a remote location; and
charge storage means comprising a capacitor circuit in parallel with said relay means connected to said acceleration sensitive switch means and to said relay means operable to keep said relay means activated for a short interval of duration in the range of about a second upon initial activation by said switch means.
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Abstract
A vehicle alarm system is disclosed which incorporates an acceleration-sensitive pendulum connected to a relay operated radio transmitter so as to signal silently to a remote station any movement of the vehicle on which the apparatus is magnetically mounted. A charge storage circuit in parallel with the relay keeps the transmitter on for about a 1 second interval.
19 Citations
9 Claims
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1. A portable alarm system comprising in combination:
- a housing adapted to support the alarm system;
means for mounting said housing in a predetermined attitude irrespective of the oRientation of the surface to which the housing is mounted;
indicating means on said housing adapted to indicate when said housing is in said predetermined attitude;
an acceleration sensitive switch means in said housing, said switch means resting in a nonconducting position when said housing is in said predetermined attitude;
activation means;
a relay means operable to be activated by said activation means and said switch means;
radio transmitting means adapted to have its output signal modified by said relay means when said relay means is activated;
radio receiving means operable to sense transmissions from said transmitting means and modifications thereof at a remote location; and
charge storage means comprising a capacitor circuit in parallel with said relay means connected to said acceleration sensitive switch means and to said relay means operable to keep said relay means activated for a short interval of duration in the range of about a second upon initial activation by said switch means.
- a housing adapted to support the alarm system;
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2. The apparatus of claim 1 in which said activation means comprises a diode controlled electronic switching means in series with said relay means which diode is controlled by a capacitor charging circuit.
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3. The apparatus of claim 2 in which said electronic switching means comprises a silicon controlled rectifier.
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4. The apparatus of claim 3 in which said means for mounting comprises a magnetic mount connected to said housing through a swiveling ball joint.
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5. The apparatus of claim 4 in which said acceleration sensitive means comprises a weighted, flexible, electrically conducting arm disposed between a pair of electrical contacts.
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6. The apparatus of claim 5 in which said indicating means comprises a bubble level in said housing.
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7. The apparatus of claim 6 in which said relay means comprises an electromagnetically operated switch, the coil of said switch connected in series with said acceleration sensitive means.
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8. The apparatus of claim 7 including a switchable grounding circuit connected to said capacitor charging circuit for preventing activation of said rectifier by said diode.
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9. The apparatus of claim 8 including a capacitive coupling to ground from the control input of said rectifier to prevent accidental switching due to transient voltages in the circuits.
Specification