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Retractable antenna device having a rodlike antenna and a helix antenna which is electrically isolated from the rodlike antenna in the retracted condition of the antenna device

  • US 5,426,440 A
  • Filed: 10/29/1993
  • Issued: 06/20/1995
  • Est. Priority Date: 02/19/1993
  • Status: Expired due to Fees
First Claim
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1. An antenna device comprising:

  • a rodlike antenna;

    an antenna cover covering said rodlike antenna, an elastically deformable helix antenna disposed near a distal end of said rodlike antenna;

    a cap covering said helix antenna and connected With said antenna cover;

    electrical conduction control means for electrically connecting said helix antenna to said rodlike antenna in an extended position of said rodlike antenna relative to a body by means of a restoring resilient force of said helix antenna and for imparting an elastic strain to said helix antenna in a retracted position of said rodlike antenna relative to the body to interrupt an electrical connection between said helix antenna and said rodlike antenna, said electrical conduction control means comprising an electrically-conductive member supported for movement along the axes of said cap and said rodlike antenna cover, and in said extended position of said rodlike antenna relative to said body, said electrically-conductive member being adapted to be urged toward said rodlike-antenna by the restoring resilient force of said helix antenna to be held in contact with said helix antenna and said rodlike antenna, and in said retracted position of said rodlike antenna relative to said body, said electrically-conductive member being adapted to be engaged with said body to impart an elastic strain to said helix antenna and also to be spaced apart from said rodlike antenna; and

    an engagement portion for releasably retaining said cap relative to said body to keep said electrically-conductive member spaced apart from said rodlike antenna in said retracted position of said rodlike antenna.

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