Earth working – Having tool overload shift controlled by a fluid pressure...
Patent
1979-03-30
1982-10-12
Johnson, Richard J.
Earth working
Having tool overload shift controlled by a fluid pressure...
172572, 172464, 111 85, A01B 6104, A01B 6332
Patent
active
043534236
ABSTRACT:
An hydraulic ram is situated between the tillage tool and the frame and is normally fully extended and acts as a rigid link. The ram has a predetermined and adjustable pressure so that if an obstruction is encountered by the tool, it only retracts when the preset pressure is exceeded and then returns to the fully extended position as soon as the obstruction is passed. It can be used on machines such as discers, hoe drills, press drills or any ground working implement which includes tillage tools which are pivoted to the frame and which do not engage the ground by raising and lowering the frame. An adjustable pressure reducing valve is situated in the hydraulic line extending to the ram and senses the pressure downstream of the valve rather than the pressure upstream as is usual.
REFERENCES:
patent: 2756662 (1956-07-01), Christensen
patent: 2979138 (1961-04-01), Martensen
patent: 3481407 (1969-12-01), Arnold
patent: 3561541 (1971-02-01), Woelfel
patent: 3706345 (1972-12-01), Patterson
patent: 3749035 (1973-07-01), Cayton
patent: 3752092 (1973-08-01), Vinyard
patent: 4044697 (1977-08-01), Swanson
patent: 4116140 (1978-09-01), Anderson
patent: 4176721 (1979-12-01), Poggemiller et al.
Poggemiller Erhard
Sweet Ralph
Ade Stanley G.
Johnson Richard J.
Kep Enterprises
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