VIBRATION-RESPONSIVE APPARATUS

• US 3,733,598 A
• Filed: 12/22/1971
• Issued: 05/15/1973
• Est. Priority Date: 12/27/1968
• Status: Expired due to Term

• Current Assignee: Tomezo Kato
• Original Assignee: Tomezo Kato
• Inventors: Kato, Tomezo
• Primary Examiner(s): Trafton, David L.
• Application Number:
  US05/210,994
• Time in Patent Office: 510 Days
• Field of Search: 340/261,258D,258R,276
• US Class Current: 367/136
• CPC Class Codes: G08B 13/1654 using passive vibration detection systems
• CPC Class Codes: H05B 33/26 characterised by the composition or arrangement of the conductive material used as an electrode

Abstract

A vibration-responsive apparatus having means for detecting a vibration and producing a signal in response to the detected vibration, and electric circuit means operating in response to the vibration when it lasts for more than a certain period of time and the signal corresponding thereto is produced a predetermined number of times, the electric circuit means being adapted to actuate a desired device connected thereto.

Claims

1. A vibration responsive apparatus for detecting mechanical vibrations propagated through a solid or fluid comprising:

means for detecting said mechanical vibrations and producing an electrical output signal when said mechanical vibrations occur;

a first electrical wave generator receiving the electrical output signal from said detecting means and producing a pulse of standard time length each time an electrical output signal is received from said detecting means and producing a series of standard time length pulses if said electrical output signal from said detecting means persists longer than said standard time length, said first electrical wave generator comprising a multivibrator including a pair of transistors with a period equal to said standard time length;

a pulse generator connected to the output of said first electrical wave generator and producing a pulse each time a standard time length pulse is generated by said first electrical wave generator;

a second electrical wave generator receiving the output of said pulse generator and comprising a ring counter for counting said pulses; and

an output warning device connected to the output of said second electrical wave generator and producing an alarm if a predetermined number of standard time length pulses are produced by said first electrical wave generator.

2. A vibration responsive apparatus according to claim 1 wherein said pulse generator comprises a relay connected to the output of said first electrical wave generator and closed each time a pulse of standard length is received, a first silicon controlled rectifier with its output connected to said electrical wave generator, a voltage source, a capacitor connected between said voltage source and the gate electrode of said first silicon controlled rectifier, and a switch connected across said capacitor and controlled by said relay.

3. A vibration responsive apparatus according to claim 2 including a resistor connected between the gate of said first silicon controlled rectifier and said second electrical wave generator.

4. A vibration responsive apparatus according to claim 2 wherein said ring counter includes a plurality of cascaded silicon controlled rectifiers connected to form a ring counter with the gate of the first of said cascaded silicon controlled rectifiers connected to said first silicon controlled rectifier and the gates of succeeding cascaded silicon controlled rectifiers connected to the outputs of preceding silicon controlled rectifiers and the last of said cascaded silicon controlled rectifiers connected to said output warning device.