Hydraulic reset for tillage and seeding equipment

Details Hydraulic reset for tillage and seeding equipment Hydraulic reset for tillage and seeding equipment

1982-06-23

1983-12-27

Johnson, Richard J.

Earth working

Having tool overload shift controlled by a fluid pressure...

172464, 172572, 111 87, A01B 6104, A01B 6332

Patent

active

044225113

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: 3439749 (1969-04-01), Olsson
patent: 3561541 (1971-02-01), Woelfel
patent: 3565180 (1971-02-01), Arnold
patent: 3752092 (1973-08-01), Vinyard
patent: 4044697 (1977-08-01), Swanson
patent: 4116140 (1978-09-01), Anderson

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