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Magnetically biased velocity change sensor

  • US 5,068,502 A
  • Filed: 11/13/1989
  • Issued: 11/26/1991
  • Est. Priority Date: 11/13/1989
  • Status: Expired due to Fees
First Claim
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1. In a velocity change sensor of the type comprising a tube having a circular cylindrical inside diameter containing a magnetically permeable sphere whose diameter is just slightly less than the tube'"'"'s inside diameter so that travel of said sphere within said tube is damped by gaseous fluid present within said tube, a magnet for biasing said sphere axially within said tube against a stop proximate one axial end of said tube, a switch disposed proximate the opposite axial end of said tube for actuation by said sphere in response to said sensor experiencing a velocity change of sufficient magnitude and duration to cause said sphere to overcome the bias of said magnet and travel within said tube from the position against said stop to a position causing said switch to give a signal indicative of the occurrence of such velocity change, the improvement comprising said sphere consisting of iron having a density of essentially 5.7 grams per cubic centimeter.

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