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Tractor with anti-slipping and overloading controls

  • US 4,344,499 A
  • Filed: 12/03/1979
  • Issued: 08/17/1982
  • Est. Priority Date: 12/08/1978
  • Status: Expired due to Term
First Claim
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1. A tractor comprising an engine, a torque converter including means for adjusting its transmission ratio, a wheel driven by said engine through said torque converter, at least one further wheel rotated by its contact with the underlying ground, and a lifting device for attachment to an implement, the tractor further comprising control means adapted to adjust automatically the transmission ratio of said torque converter in dependence on slipping of said driven wheel with respect to the ground compared to the rotation of said further wheel, said control means comprising counters which operatively count the revolutions of said driven wheel and the revolutions of said further wheel and a comparator which provides a signal when there is a predetermined difference between the respective revolutions of said driven wheel and said further wheel, said control means adjusting said transmission ratio to decrease the speed of said tractor in response to said signal.

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