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Pressure operated switch including an expandable flat tube

  • US 4,446,344 A
  • Filed: 10/26/1981
  • Issued: 05/01/1984
  • Est. Priority Date: 02/21/1980
  • Status: Expired due to Fees
First Claim
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1. Apparatus in fluid communication with a selected environment of varying pressure, said apparatus responsive to a predetermined pressure change in said environment and causing a controlled, consistent relative movement between a flat tube support surface of said apparatus and a tube compression member of said apparatus comprising:

  • a tube having a segment of deformable material adapted to expand and contract in response to a varying pressure condition, said tube disposed in fluid communication with said environment and inserted between a flat tube support surface and the tube compression member;

    said tube support surface in juxtaposition to said tube compression member, said tube support surface contacting a surface of said tube segment; and

    said tube compression member contacting another elongated surface of said tube segment in an unpressurized condition so that there is relative movement between said support surface and said tube compression member upon expansion or contraction of said segment of said tube lying between said support surface and said tube compression member;

    said tube segment lying between said support surface and said tube compression member being flat on at least said entire elongated surface of said tube segment in contact with the tube compression member when said tube is in an unpressurized condition.

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