Earth working – With actuator
Patent
1976-06-04
1977-06-21
Pellegrino, Stephen C.
Earth working
With actuator
172224, 172705, A01B 6500
Patent
active
040305520
ABSTRACT:
In a plow assembly, each plow bottom is supported by an arm mounted pivotally on a beam for movement of the plow bottom between outwardly extending and inwardly retracted positions. The beam and each arm are operatively interconnected by an extensible fluid pressure piston-cylinder unit supplied at one end with fluid under pressure, whereby the plow bottom is urged toward said outwardly extending position. The opposite end of the piston-cylinder unit communicates with a sealed chamber containing air or other compressible gas to prevent entrance into the cylinder of air laden with dust and other debris. In a two-way plow assembly, the arms of each opposed pair are interconnected by the fluid pressure piston-cylinder unit, and abutment means interengages each arm and the beam to limit the degree of outward extension of the plow bottoms.
REFERENCES:
patent: 3511050 (1970-05-01), Taberner
patent: 3539018 (1970-11-01), Sprenkel
patent: 3662840 (1972-05-01), Richey
patent: 3672402 (1972-06-01), Bloemer
patent: 3760882 (1973-09-01), Geurts
Olson Oliver D.
Pellegrino Stephen C.
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