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Geophone spring

  • US 5,134,593 A
  • Filed: 05/17/1991
  • Issued: 07/28/1992
  • Est. Priority Date: 05/17/1991
  • Status: Expired due to Fees
First Claim
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1. A spring, for use in a motion sensor, for suspending an inertial mass at a predetermined position within a fixed support structure, comprising:

  • (a) an outer annulus;

    (b) an inner annulus concentric with the outer annulus;

    (c) a plurality of arcuate legs radially disposed around the center of the spring at substantially equal distances from each other and interconnecting the outer annulus with the inner annulus, wherein each leg has an inner edge defined by a first set of outside, middle and inside arcs having dissimilar centers and an outer edge defined by a second set of outside, middle and inside arcs with dissimilar centers, the two middle arcs defining a middle section of constant width which equally disperses torsional stress along the constant width length to reduce mechanical sagging of the suspended mass thereon, and the outside and inside arc pairs defining outside and inside sections that taper outwardly from their respective junctions with the constant-width center section to their respective connections with the outer and inner annuli.

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