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EXPANSION JOINT FOR CONNECTING RIGID CONDUIT WITH GROUNDING CONTINUITY

  • US 3,783,178 A
  • Filed: 08/03/1972
  • Issued: 01/01/1974
  • Est. Priority Date: 08/03/1972
  • Status: Expired due to Term
First Claim
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1. An electrically conducting expansion joint comprising in combination:

  • a. a body member having first and second ends coupling a section of rigid conduit to another member with said first end thereof coupled to said another member by a means which provides for high integrity electrical continuity between said body member and said another member;

    b. said body member having an internal size at its second end which is at least of sufficient size admitting a portion of said rigid conduit section therein;

    c. head coupling means coupling a head member to said body member and which provides electrical continuity between said body member and said head member and wherein said head member includes an opening receiving an end of said rigid conduit section therethrough;

    d. grounding ring confined between said head member and said rigid conduit section and encircling said rigid conduit section;

    e. pressure producing means confined between said head member and said grounding ring for applying pressure between said grOunding ring and both of said head member and said rigid conduit section providing electrical continuity between said head member and said grounding ring and sliding electrical continuity between said grounding ring and said rigid conduit section; and

    f. motion limiting means including a longitudinal extension of said grounding ring limiting the longitudinal motion of said rigid conduit section in the direction to remove it from said head member so that said electrical continuity between said head member and said rigid conduit section is not endangered.

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