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Pressure sensitive switch

  • US 4,160,139 A
  • Filed: 08/29/1977
  • Issued: 07/03/1979
  • Est. Priority Date: 08/29/1977
  • Status: Expired due to Term
First Claim
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1. A pressure sensitive switch comprising:

  • a housing including a cap having a top wall and a continuous side wall,a spacer tightly disposed within said housing and including a support surface,a dielectric substrate secured to said support surface of said spacer,a metal diaphragm mounted about its periphery on said substrate and forming a first cavity with said top wall of said cap and a second cavity with said substrate,said first cavity communicating with a source of fluid pressure,said metal diaphragm having a large resilient surface portion movable toward and away from said substrate in response to variations in fluid pressure within said first cavity,a first contact supported by said substrate in a preselected position relative to said diaphragm, anda second contact supported by said diaphragm and arranged for movement with said diaphragm,said second contact engaging and disengaging said first contact in response to variations in fluid pressure within said first cavity.

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