Anti-buck-jump coupling gears for tractor and semi-trailer vehicles

Claim 1

A DEVICE FOR REDUCING THE BUCK-JUMP EFFECT IN TRACTORS OF SEMI-TRAILER VEHICLES, COMPRISING AT LEAST TWO PAIRS OF ROLLERS CONNECTING THE KING-PIN SUPPORTING PLATFORM OF THE TRACTOR TO THE CHASSIS THEREOF, EACH PAIR OF SAID ROLLERS BEING DISPOSED ON THE SAME LATERAL SIDE OF THE PLATFORM WITH RESPECT TO THE LONGITUDINAL AXIS OF THE VEHICLE AND SO DIRECTED THAT A RADIUS OF EACH OF SAID ROLLERS ON ONE SIDE INTERSECTS AT A POINT LOCATED ABOVE THE TRACTOR PLATFORM, AT LEAST TWO PAIRS OF RACEWAYS HAVING A PREDETERMINED VERTICAL CURVATURE FIXEDLY ATTACHED TO SAID TRACTOR CHASSIS, ONE END OF EACH OF SAID LOAD-BEARING MEANS BEING IN ROLLING ENGAGEMENT WITH A CORRESPONDING RACEWAY TO DEFINE A MOMENTARY AXIS OF VERTICAL ROTATION PASSING THROUGH SAID INTERSECTION OF THE LOAD BEARING MEANS, SAID AXIS BEING ABOVE SAID PLATFORM AND SHIFTED FORWARD WHEN THE TRACTOR IS REARING AND BACKWARD WHEN THE TRACTOR IS TILTING FORWARD.