Remote activated alarm triggering device

• US 4,535,324 A
• Filed: 07/12/1982
• Issued: 08/13/1985
• Est. Priority Date: 07/12/1982
• Status: Expired due to Fees

• Current Assignee: Mark Levental
• Original Assignee: Mark Levental
• Inventors: Levental, Mark
• Primary Examiner(s): Swann, III, Glen R.
• Application Number:
  US06/397,538
• Time in Patent Office: 1,128 Days
• Field of Search: 340/531, 340/539, 340/574, 200/DIG. 2, 200/61.58 R, 200/52 R
• US Class Current: 340/574
• CPC Class Codes: G08B 1/08 using electric transmission ; transformation of alarm signals to electrical signals from a different medium, e.g. transmission of an electric alarm signal upon detection of an audible alarm signal
• CPC Class Codes: G08B 21/0297 Robbery alarms, e.g. hold-up alarms, bag snatching alarms

Abstract

An alarm activator in the form of a ring-transmitter can be squeezed readily to activate an alarm by either ultrasonic or radio or infrared waves. The ring consists of either an ultrasonic or radio or infrared transmitter in a casing welded on an incomplete ring. Inside the casing is located a power source, a time delay circuit, an oscillator, a timer and either an ultrasonic or radio or infrared transducer. The tips of the incomplete ring are provided with two conductors, e.g. silver plates, one on each tip, forming a normally open contact. An all-around clearance is provided between the casing and the ring to permit the compression of the ring without interference from the casing to close the normally open contact and to permit current to flow from the power source through the time delay, energizing the timer which in turn will turn on the oscillator for a short time. The oscillator energizes the transducer which generates either ultrasonic, radio or infrared waves, and upon reaching a receiver an alarm will be initiated.

Claims

1. A remotely activated alarm triggering device comprising a transmitter means mounted in a casing which is secured to an incomplete finger ring, said ring having opposed free ends forming a gap, an electrical conductor secured to each of said opposed free ends, said gap forming a normally open contact, said normally open contact being closed by applying opposing forces on said ring by fingers adjacent said ring when worn to close the normally open contact whereby to activate said transmitter to generate a signal to activate a remote alarm circuit.

2. A remotely activated alarm triggering device as defined in claim 1, wherein said transmitter means is an ultrasonic frequency transmitter;

said transmitter including a power source, a time delay circuit, an oscillator, a timer and an ultrasonic sound generator;

said normally open contact when closed permitting current to flow from said power source through said time delay circuit energizing said timer which turns on the oscillator for a short time, said oscillator energizing said ultrasonic sound generator which generates ultrasonic sound waves to activate said alarm circuit, wherein said alarm circuit is a receiver comprising a transducer which will convert said generated sound waves into corresponding electrical impulses, said impulses being filtered by a band-pass filter to eliminate surrounding interference, and to make sure that only a predetermined frequency can activate an alarm, said electrical impulses, having passed said filter, being amplified by an amplifier and fed to an alarm activator through a time delay circuit.

3. A remotely activated alarm triggering device as defined in claim 2, in which said casing is welded to said ring adjacent one of said opposed free ends and extends across said gap, said casing also having an all-around clearance between the casing and the ring to permit said gap to be closed without interference from said casing.

4. A remotely activated alarm triggering device as defined in claim 3, in which said clearance is between 0.1 and 3.0 millimeters wide.

5. A remotely activated alarm triggering device as defined in claim 2, in which said conductors are silver plates mounted on the free ends of the ring to form said normally open contact.

6. A remotely activated alarm triggering device as defined in claim 5, in which said gap between said conductors is between 0.1 and 3.0 millimeters wide.

7. A remotely activated alarm triggering device as defined in claim 2, in which said ultrasonic sound generator is a piezoelectric crystal.

8. A remotely activated alarm triggering device as defined in claim 2, in which said time delay circuit of said transmitter provides a time delay of between 0.1 and 5 seconds.

9. A remotely activated alarm triggering device as defined in claim 2, in which said timer will automatically turn off said transmitter after a delay of 0.1-20 seconds.

10. A remotely activated alarm triggering device as defined in claim 2, in which said time delay circuit of receiver provides a delay of between 0.01 and 5 seconds.

11. A remotely activated alarm triggering device as claimed in claim 1, wherein said transmitter means is a radio transmitter which generates radio frequency waves.

12. A remotely activated alarm triggering device as claimed in claim 1, wherein said transmitter means is an infrared transmitter generating infrared frequency waves.