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Jumper cable

  • US 4,272,142 A
  • Filed: 10/15/1979
  • Issued: 06/09/1981
  • Est. Priority Date: 10/15/1979
  • Status: Expired due to Term
First Claim
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1. A jumper cable device, comprising,a first electrical cable means having opposite ends,a pair of electrical connector clamps on one end of said first electrical cable means,an electrical coupling on the other end of said first electrical cable means,a second electrical means having opposite ends,a pair of electrical connector clamps on one end of said second electrical cable means,an electrical coupling on the other end of said electrical cable means,each cable means being comprised of positive and negative cable elements,electrical circuit means electrically connecting said cable elements within said couplings,polarity signal means imposed in said circuit means,a diode in said circuit means permitting flow of current in only one direction through said polarity signal means from one of said cable elements whereby the flow of current through said polarity signal means is indicative of the polarity of the clamps and cable elements associated therewith,said electrical couplings adapted to be secured directly together to effect electrical connection between said first and second electrical cable means,said electrical couplings having positive and negative terminals electrically connected to the positive and negative cable elements, respectively, of each cable means, and means on said couplings permitting the interconnection of said positive terminals together and permitting the interconnection of said negative terminals together, and preventing the interconnection of said positive and negative terminals.

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