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Speedometer particularly for water skis

  • US 3,978,725 A
  • Filed: 01/07/1976
  • Issued: 09/07/1976
  • Est. Priority Date: 01/07/1976
  • Status: Expired due to Term
First Claim
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1. A speed indicating apparatus particularly for water skis, said indicator apparatus including:

  • (a) a ski body;

    (b) a pressure responsive gauge carried on and by the ski body and having indicia and a viewing face so positioned as to be readily visible to the user of the skis and also when the skis are advanced in normal use in the water;

    (c) a tubular conductor provided in the ski body and having its forward end operatively connected to the pressure responsive gauge and its rear or other end disposed on the underside and toward the trailing end of the ski as used;

    (d) a flexible diaphragm carried by the ski and disposed so as to close the tubular conductor at a point near its rear opening to the water, and (e) a fluid means filling that portion of the tubular conductor between the operative connection to the pressure responsive gauge and the diaphragm, and in response to the movement of the diaphragm as effected by the rush of water by the rear opening of the tubular conductor the diaphragm and the fluid in the sealed conductor is moved so as to actuate the gauge to provide an indication thereon of the rate of travel of the ski through the water.

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