Oil-pneumatic load control device

Details Oil-pneumatic load control device Oil-pneumatic load control device

1993-07-19

1995-05-30

Look, Edward K.

Earth working

Automatic power control

Land leveller type

111200, 111906, 60418, 60473, 60571, A01B 63111, F16D 3102

Patent

active

054194016

ABSTRACT:
A load control device applicable on agricultural machinery in general and in particular on machinery used for direct planting, so that the working components in contact with the ground will maintain the same load constantly at all times for any ground profile condition. An oil-pneumatic device is provided with a fluid compressor connectable to the tractor's power take-off by a cardan shaft and an electromagnetic clutch that can be powered from the tractor's electrical system or by an independent source, including a compressor with its associated pressurestat which governs it in order to maintain the air pressure required by the circuit. The compressor supplies a tank of compressed air, to which is connected at least one hydraulic cylinder whose upper and lower chambers are each connected to intermediate air and oil collecting reservoirs. The tank and reservoirs which supply the hydraulic cylinder are interconnected alternately by a two-way electrovalve in each of its two positions, while the reservoirs in turn in each position of the valve alternate their connection with the atmosphere through a filtering medium.

REFERENCES:
patent: 3529424 (1970-09-01), Cibie
patent: 4089172 (1978-05-01), Junttila
patent: 4872310 (1989-10-01), Kaye
patent: 5033397 (1991-07-01), Colburn, Jr.
patent: 5234060 (1993-08-01), Carter

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