Motion sensing alarm

• US 4,772,879 A
• Filed: 12/22/1986
• Issued: 09/20/1988
• Est. Priority Date: 12/22/1986
• Status: Expired due to Fees

• Current Assignee: Kalynchuk Dinah 10340 Railway Avenue Richmond British Columbia Canada V7E 2B8, Reuben Rothstein, Sydney Harrison
• Original Assignee: Dinah Kalynchuk, Reuben Rothstein, Sydney Harrison
• Inventors: Hein, Edward A.
• Primary Examiner(s): Swann, III, Glen R.
• Application Number:
  US06/944,828
• Time in Patent Office: 638 Days
• Field of Search: 340/63, 340/65, 340/571, 340/566, 340/527, 340/530, 340/541
• US Class Current: 340/571
• CPC Class Codes: B60R 25/1007 comprising associated circuitry
• CPC Class Codes: G08B 13/02 Mechanical actuation
• CPC Class Codes: G08B 13/1436 with motion detection

Abstract

A motion sensing alarm is disclosed. It is comprised of a time delayed switching circuit connected between a supply circuit and an electronic logic circuit. A triggering circuit is connected between the switching circuit and a false triggering circuit and the electronic logic circuit. An alarm initiating circuit is connected between the electronic logic circuit and an alarm.

Claims

1. A motion sensing alarm, comprising:

time delayed circuit means connected between a supply means via a switch and a first input of said electronic logic circuit means;

sensor means comprising a thin metallic wire having a weight at its distal end, said wire being disposed in a generally central position within a contact making element until motion is detected, said wire being connected between said switch and said time delay circuit means and said contact making element being connected to a second input of said electronic logic circuit means;

alarm initiating circuit means connected to said electronic logic circuit means;

false triggering circuit connected between said electronic logic circuit means and said alarm initiating circuit means; and

alarm means connected at the output of said electronic logic circuit means.

2. A motion sensing alarm as defined in claim 1 wherein said electronic logic circuit means comprises a first NAND gate having a first and a second input and having an output connected to inputs of a second NAND gate, said second NAND gate being connected to said flase triggering circuit means and a first input of a third NAND gate via a diode, said third NAND gate having a resistor connected between its output and its second input and a capacitor connecting said resistor to ground so as to form said alarm initiating circuit means, the output of said third NAND gate being connected being connected to the input of a fourth NAND gate with its output connected to said alarm means.

3. A motion sensing alarm as defined in claim 2 further comprising stabilizing circuit means connected between said contact making element and ground.

4. A motion sensing alarm as defined in claim 3 wherein said stabilizing circuit means comprises a resistor connected in parallel with a capacitor.

5. A motion sensing alarm as defined in claim 4 wherein said time delay circuit means comprises a resistor connected in series with a capacitor.

6. A motion sensing alarm as defined in claim 5 wherein said alarm means comprises a buzzer connected between the output of said fourth NAND gate and ground.