REMOTE ALARM SYSTEM

• US 3,668,675 A
• Filed: 04/03/1970
• Issued: 06/06/1972
• Est. Priority Date: 04/03/1970
• Status: Expired due to Term

• Current Assignee: Allan D. Joens, Michael Riggle, Robert W. Johnson
• Original Assignee: Allan D. Joens, Michael Riggle, Robert W. Johnson
• Inventors: Johnson, Robert W., Joens, Allan D., Riggle, Michael
• Primary Examiner(s): Trafton, David L.
• Application Number:
  US05/025,330
• Time in Patent Office: 795 Days
• Field of Search: 340/224,276,63,64,65,261 307/293 325/111,116
• US Class Current: 340/426.18
• CPC Class Codes: B60R 25/102 a signal being sent to a remote location, e.g. a radio signal being transmitted to a police station, a security company or the owner
• CPC Class Codes: G08B 13/02 Mechanical actuation

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.

Claims

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.

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.

3. The apparatus of claim 2 in which said electronic switching means comprises a silicon controlled rectifier.

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.

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.

6. The apparatus of claim 5 in which said indicating means comprises a bubble level in said housing.

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.

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.

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.