Agricultural rig pressure adjustment with overcenter toggle

Details Agricultural rig pressure adjustment with overcenter toggle Agricultural rig pressure adjustment with overcenter toggle

1995-11-17

1997-02-11

Melius, Terry Lee

Earth working

Plural relatively movable tools

Plural tool groups relatively vertically movable because of...

172744, A01B 6332

Patent

active

056011474

ABSTRACT:
Down pressure structure for providing an adjustable down force on a rig of row crop implement such as a cultivator includes an overcenter toggle connected to the rig for pivoting about a toggle axis between a first and second positions. The toggle has a protrusion that contacts the edge of a rig plate at two different locations corresponding to a light and a heavy down pressure position. A down pressure spring is tensioned between the frame and the toggle and maintains the toggle in a selected one of two overcenter positions corresponding to the two different spring tension positions. A hex projection on the toggle receives a conventional wrench for moving the toggle between the first and second positions. A second toggle and down pressure spring combination provide additional spring adjustments so that at a numerous easily determinable down pressure settings are available.

REFERENCES:
patent: 2580480 (1952-01-01), Streblow et al.
patent: 3708019 (1973-01-01), Ryan
patent: 4461355 (1984-07-01), Peterson et al.
patent: 4766962 (1988-08-01), Frase
patent: 4846084 (1989-07-01), Sigle
patent: 4974683 (1990-12-01), Hanig et al.
patent: 5163518 (1992-11-01), Foley

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