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Fabrication of seismic springs from sheets

  • US 4,400,861 A
  • Filed: 11/27/1981
  • Issued: 08/30/1983
  • Est. Priority Date: 11/27/1981
  • Status: Expired due to Fees
First Claim
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1. A method of preforming at least one sheet containing a plurality of seismometer spider springs, while the springs remain connected to the body of the sheet by tie tabs, comprising:

  • positioning the sheet in a preform fixture having internal parts constructed to simultaneously displace each inner ring of each spring relative to its outer ring by a predetermined distance; and

    heat treating the fixture with the sheet therein, thereby causing the simultaneous preforming of the spider springs whereby each inner ring is permanently displaced from its outer ring.

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