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Liquid level detection apparatus

  • US 7,350,413 B2
  • Filed: 07/22/2005
  • Issued: 04/01/2008
  • Est. Priority Date: 07/22/2004
  • Status: Active Grant
First Claim
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1. A liquid level detection apparatus comprising:

  • a float arm which includes a swing portion for swing around an axis of a rotation shaft portion thereof, and has a float mounted on a distal end portion thereof;

    an arm holder which holds said float arm, and enables said float arm to be swung around the axis of said rotation shaft portion;

    a contact plate which is fixed to said arm holder, and is operatively associated with said swing portion of said float arm;

    a contact provided at a distal end portion of said contact plate; and

    a resistance plate which is formed on a wiring board, and has a conductor portion over which said contact can slide so as to detect a liquid level;

    wherein a conductor pattern formed other than said conductor portion is formed on a region of said wiring board which said contact at the distal end portion of said contact plate contacts when said arm holder is mounted with respect to said wiring board.

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