Earth working – With actuator adapted to lift tool for transport on wheeled... – Plural tools – individually spring biased down – lifted as unit
Patent
1991-08-21
1992-11-17
Reese, Randolph A.
Earth working
With actuator adapted to lift tool for transport on wheeled...
Plural tools, individually spring biased down, lifted as unit
172500, 1726245, 111 62, A01B 6332
Patent
active
051635186
ABSTRACT:
A plurality of parallel arm type openers are mounted on a frame tube, and a rockshaft is supported directly below the tube. Adjacent each of the openers, a lever arm is fixed for rotation with the rockshaft and, upon rotation of the rockshaft in a first direction, the lever arm engages the parallel arms to lift the opener while the frame tube remains stationary in the vertical direction. A tension spring assembly connected between the parallel arms and the lever arm applies varying down force when the opener is lowered by rotating the rockshaft in the opposite direction. The amount of down pressure can be adjusted for varying conditions by rotation of the rockshaft, and adjustment can be made on-the-go from the tractor cab to compensate for changing ground conditions in a given field. Locking structure on the row units permits selective lock-up of row units with a single cycle of the hydraulic lift system.
REFERENCES:
patent: 2225393 (1940-12-01), Ray
patent: 2580480 (1952-01-01), Strohlow et al.
patent: 2616348 (1952-11-01), Ariens
patent: 3601202 (1971-08-01), Steffe
patent: 4116140 (1978-09-01), Anderson
patent: 4149475 (1979-04-01), Bailey et al.
patent: 4766962 (1988-08-01), Frase
Deere & Company
Reese Randolph A.
Thompson Jeffrey L.
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