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Geophone spring

  • US 5,134,594 A
  • Filed: 07/03/1991
  • Issued: 07/28/1992
  • Est. Priority Date: 07/03/1991
  • Status: Expired due to Fees
First Claim
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1. In a geophone having a cylindrical housing having a longitudinal axis, a cylindrical magnet assembly in the housing having its longitudinal axis along the longitudinal axis of the housing, said magnet assembly forming an annulus between the magnet assembly and the housing, and fixed against lateral and axial movement relative to the housing, said magnet assembly forming an annulus between the magnet assembly and the housing, a cylindrical coil-mass located in the annulus between the magnet assembly and the housing and surrounding the magnet assembly, and disc-shaped spider springs mounted on the magnet assembly for supporting the coil-mass for longitudinal and lateral movement of the coil-mass relative to the magnet assembly, each of said spider springs comprising an outer ring, an inner ring, and three arms connecting the outer and inner rings, said arms extending from a juncture point on the outer ring to a juncture point on the inner ring, said arm being formed by three slots, each of which extends along the outside surface of one leg and the inside surface of an adjacent leg, said portions of the slots that extend along the outside surface of each leg being substantially wider for most of their length than the rest of the slot so the outer ring can move laterally toward the center of the springs with the coil-mass until the coil-mass engages either the housing or the magnet assembly when the geophone is subjected to sharp lateral forces without stressing the arms beyond their elastic limits.

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