Land vehicles – Wheeled – Articulated vehicle
Patent
1977-04-19
1980-03-25
Pekar, John A.
Land vehicles
Wheeled
Articulated vehicle
172439, A01B 5906
Patent
active
041947568
ABSTRACT:
Removable lifting devices for tractors having horizontal front wheel axles which pivot relative to the contour of the ground, one device having tubes pivotably connected on each side of the tractor frame which rotatably and pivotably receive further tubes connected by a hinged structure to the tractor's forward axle and which extend forwardly thereof to be interconnected across the front of the tractor. The connecting hinged structure permits pivotable movement of the tube relative to the axle about substantially horizontal axes parallel and perpendicular to the longitudinal axis of the tractor. The front structure connecting the tube portions extending forwardly from the axle includes a hydraulically operated three-point lifting device wherein hydraulic cylinders are disposed within a quadrangular arrangement of pivotable arms including the lower of the three-point lifting device's links. A power take-off from the rear of the tractor is connected through a gear transmision and appropriate linkage supported under the tractor, including universal joints, to extend forwardly of the tractor for optional connection to a machine or tool connected to the lifting device. In a further embodiment, the front support for the lifting device is rigidly connected to the front axle on both sides of the tractor. Torque generated by the load of the lifting device is compensated for by hydraulic cylinders which are disposed horizontally to connect the tractor's frame and upward extensions which are rigidly connected to the lifting device's front supporting beam and via same to the front axle. Such extensions are maintained in a relative vertical position by the hydraulic cylinders whereby twisting of the front axle is prevented.
REFERENCES:
patent: 3020066 (1962-02-01), Torrey
patent: 3145781 (1964-08-01), Rogler
patent: 3201878 (1965-08-01), Markwardt
patent: 3620551 (1971-11-01), Brown
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