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Trailer hitching aid

  • US 4,988,116 A
  • Filed: 04/10/1989
  • Issued: 01/29/1991
  • Est. Priority Date: 04/10/1989
  • Status: Expired due to Fees
First Claim
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1. A towing vehicle positioning aid for joining a vehicle mounted hitching ball to a trailer mounted ball accepting socket, the positioning aid comprising:

  • switching means including a set of three magnetically actuated normally open switches spaced apart about the ball in a triangular pattern, the rearmost side thereof being lateral to the vehicle and rear of the ball; and

    a set of three permanent bar magnets generating a permanent magnetic field having a pair of side segments disposed on each side of the socket parallel to the trailer longitudinal axis and a segment perpendicular to said axis connecting the pair of ends of the side segments which are forward of the socket, so that the closing of only one or two of the switches corresponds to the direction of deviation of the position of the ball from the socket; and

    means indicating to the vehicle operator the open or closed condition of each of the switches as the vehicle is maneuvered into trial hitching positions.

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