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Semi-trailer lifting and coupling gear for tractor vehicles

  • US 4,148,497 A
  • Filed: 01/31/1977
  • Issued: 04/10/1979
  • Est. Priority Date: 03/22/1976
  • Status: Expired due to Term
First Claim
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1. Device for lifting the pole of a trailer of the semi-carried type and coupling same to a tractor vehicle, which comprises a supporting bracket secured beneath, and to the rear of said tractor, substantially in alignment with the longitudinal center line thereof, and further comprising a lever having a hook-shaped rear end adapted to engage the shackle of said trailer pole and a crosshead-shaped opposite end, said lever being pivoted to said supporting bracket about a horizontal axis, a hydraulic cylinder and piston unit mounted on the vehicle and connected to move the hook shaped rear end portion of the lever from a low position corresponding to the picking up of said shackle to a high coupling and hauling position in which said lever is locked against motion by a safety locking system, and a pivot pin for mounting said lever on said supporting bracket about said horizontal axis, said safety locking system including a visible element movable between one position to indicate a locked condition and another position to indicate an unlocked condition, said hydraulic cylinder and piston being adapted to pull said crosshead portion of said lever for lifting same being pivoted to said supporting bracket about an axis located upstream of the plane containing the axis of the rear axle of said tractor, said lever being adapted to be locked in relation to said bracket in the upper coupling position by means of said safety locking system including a latch bolt adapted to abut an inwardly contoured portion of said crosshead shaped opposite end.

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