PORTABLE SECURITY ALARM AND ALARM SYSTEM

• US 3,710,371 A
• Filed: 02/18/1970
• Issued: 01/09/1973
• Est. Priority Date: 02/18/1970
• Status: Expired due to Term

• Current Assignee: BROOKS, ROYCE L., 418 VISTA CORT, BENICIA,
• Original Assignee: George J. Whalen, Rudolf F. Graf
• Inventors: Whalen, George J., Graf, Rudolf F.
• Primary Examiner(s): Trafton, David L.
• Application Number:
  US05/012,344
• Time in Patent Office: 1,056 Days
• Field of Search: 340/283,280,276,384E,224,261,327
• US Class Current: 340/571
• CPC Class Codes: G08B 13/1436 with motion detection

Abstract

A portable alarm system including at least one alarm device triggered when displaced from a normal position. A mercury switch triggers a latching type semi-conductor switch, causing electrical current to energize an alarm. Once sounded, the alarm cannot be silenced unless the correct procedure or key method is followed.

Claims

1. An alarm system comprising a source of electrical power, alarm means for producing an alarm signal when connected to said source of electrical power, first switch means for providing a gating pulse, a latching gate, said first switch means being connected to said latching gate, said latching gate being responsive to said gating pulse for connecting said alarm means to said source of electrical power, and second switching means different from said first switch means for disconnecting said alarm means from said source of electrical power, said latching gate including a silicon controlled rectifier, said first switch means including a mercury switch, said second switch means including shunt means connected across said latching gate for diverting electrical power away from said latching gate.

2. The alarm device set forth in claim 1, wherein said second switch means is provided with a high gain current amplifier, a pair of contact means for causing current to flow through said high gain current amplifier when said contact means are activated, said high gain current amplifier shunting said latching gate diverting electrical power from said latching gate when said pair of contact means are activated and further disconnecting said alarm means from said source of electrical power when said contact means are deactivated.

3. The alarm device set forth in claim 2, including a housing having said alarm means, said source of electrical power, said first and second switch means, and said latching gate being located therein, said latching gate connecting said source of electrical power to said alarm means when said housing is displaced from a normal position.

4. The alaRm device set forth in claim 3, wherein said first switch means includes a mercury switch being gravity responsive and connecting said source of electrical power to said alarm means when said housing is displaced from said normal position, said housing being provided with a bottom capable of adhering to non-level surfaces.