Down pressure spring adjustment

Details Down pressure spring adjustment Down pressure spring adjustment

1995-04-17

1996-08-13

Melius, Terry Lee

Earth working

Plural relatively movable tools

Vertically translatable tool

1726245, 172705, 172736, A01B 3922

Patent

active

055447090

ABSTRACT:
A series of notches are provided in the upright plates on one end of a parallel bar linkage connecting a cultivator rig or planter assembly to a tool bar. Coil springs are tensioned between the opposite end of the linkage and a rod and trunnion assembly that fits into the series of notches. The coil springs maintain the rod and trunnion in a selected set of notches. A handle on the rod allows the operator to walk the rod and trunnion assembly up and down the series of notches to select a different set of notches and thereby incrementally adjust the down pressure to a known value or setting. When the tool bar is raised to a transport position and the linkage pivots downwardly to a lowermost position, the spring is stretched only slightly so that down pressure adjustments can be made easily using only the handle on the rod.

REFERENCES:
patent: 2580480 (1952-01-01), Strehlow
patent: 2616348 (1952-11-01), Ariens
patent: 3203487 (1965-08-01), Whitesides
patent: 3452826 (1969-07-01), Lehman
patent: 3804179 (1974-04-01), Johnson
patent: 4461355 (1984-07-01), Peterson et al.
patent: 4766962 (1988-08-01), Frase
patent: 4895086 (1990-01-01), Tye, III
patent: 5163518 (1992-11-01), Foley
patent: 5398771 (1995-03-01), Hornung et al.
Deere & Company, brochure entitled "Cultivators and Hoes, Win Your War On Weeds The Low-Cost Way", 16 pages (see particulary the front cover, pp. 10-11, and the back cover), dated Aug. 1994, published in the U.S.A.

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