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Vibration sensor

  • US 4,966,031 A
  • Filed: 01/06/1989
  • Issued: 10/30/1990
  • Est. Priority Date: 01/11/1988
  • Status: Expired due to Term
First Claim
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1. A nonresonant knocking sensor comprising:

  • a ceramic piezoelectric element having electrodes and a mass member, whereby forming a seismic system;

    a base member shaped in the form of a sleeve with a structure for installation on an object the knocking of which is to be measured;

    means for mounting said piezoelectric element and said mass member onto the periphery of said base member;

    means for tightening said piezoelectric element and said mass member to said base member;

    lead wires connected to said electrodes extending away therefrom; and

    polyamide resin casing integrally encasing said piezoelectric element, said mass member, said tightening means and a portion of the lead wires.

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