Electronic probe for sensing and reproducing the sound of mechanical movement

• US 4,038,866 A
• Filed: 08/13/1976
• Issued: 08/02/1977
• Est. Priority Date: 08/13/1976
• Status: Expired due to Term

• Current Assignee: John F. Johnson
• Original Assignee: John F. Johnson
• Inventors: Johnson, John F.
• Primary Examiner(s): Gill, James J.
• Application Number:
  US05/714,108
• Time in Patent Office: 354 Days
• Field of Search: 73/71.2, 73/71.4, 310/20, 310/23, 310/15
• US Class Current: 73/654
• CPC Class Codes: G01H 1/00 Measuring characteristics of vibrations in solids by using direct conduction to the detector G01H9/00, G01H11/00 take precedence

Abstract

A vibration detector including a probe, a transducer and an amplifier coupled to visual and audible read-out devices for monitoring mechanical and electro-mechanical equipment during operation.

Claims

1. A vibration detector for translating mechanical vibratory motion into electrical values comprising:

a casing formed with an internal chamber,

a transducer assembly mounted in the chamber of said casing,

said assembly comprising a hollow non-ferrous cone having an apex,

a first metallic diaphragm attached on one of its sides to an opening through the apex of said cone,

a dynamic microphone,

said microphone being mounted within a housing attached to said cone and comprising a voice coil, an associated second diaphragm, and a permanent magnet attached to said housing,

said housing being arranged to extend within said cone,

an elongated insulator,

a metallic probe connected to one end of said insulator,

the other end of said insulator being connected to said first diaphragm, and

weight means attached to said second diaphragm for holding it and said voice coil relatively stationary,

whereby vibrations transmitted through said probe produce sympathetic vibrations in said housing while said weight means attached to said second diaphragm holds it and said voice coil relatively stationary thus inducing a voltage in said voice coil representative of the vibration sensed by said probe.

2. The vibration detector set forth in claim 1 wherein:

said second diaphragm is provided with a plurality of spaced holes therethrough serving as air passageways for increasing the sensitivity and frequency response of said microphone.

3. The vibration detector set forth in claim 1 wherein:

said casing is in the form of a handgun, and

said probe extends therefrom simulating the barrel of the handgun.

4. The vibration detector set forth in claim 1 in further combination with:

an amplifier connected to said voice coil for amplifying its output, and

means for controlling the output volume of said amplifier.

5. The vibration detector set forth in claim 2 in further combination with:

an amplifier mounted in said casing and connected to said voice coil for amplifying its output, and

means for controlling the output of said amplifier.

6. The vibration detector set forth in claim 4 in further combination with:

a set of earphones,

said amplifier and means for controlling said volume being mounted in said earphones.

7. A system for sensing the mechanical vibration motions of various parts of a mechanical assembly and translating each motion sensed into an electrical signal comprising:

at least two vibration detectors,

each of said detectors comprising;

a casing formed with an internal chamber,

a transducer assembly mounted in the chamber of said casing,

said assembly comprising a hollow non-ferrous cone having an apex,

a first metallic diaphragm attached on one of its sides to an opening through the apex of said cone,

a dynamic microphone,

said microphone being mounted within a housing attached to said cone and comprising a voice coil, an associated second diaphragm, and a permanent magnet attached to said housing,

said housing being arranged to extend within said cone,

an elongated insulator,

a metallic probe connected to one end of said insulator,

the other end of said insulator being connected to said first diaphragm, and

weight means attached to said second diaphragm for holding it and said voice coil relatively stationary,

whereby vibrations transmitted through said probe produce sympathetic vibrations in said housing while said weight means attached to said second diaphragm holds it and said voice coil relatively stationary thus inducing a voltage in said voice coil representative of the vibration sensed by said probe, and

means for translating said voltage of each detector to an observable signalling device.

8. The system set forth in claim 7 in further combination with:

sequencing means for selectively sensing the signals of said detectors.