Earth working – Diverse tools – Including colter
Patent
1976-07-14
1977-11-08
Johnson, Richard J.
Earth working
Diverse tools
Including colter
172439, 172699, 280 432, 172419, 172271, A01B 1308, A01B 5906, A01B 6104
Patent
active
040571122
ABSTRACT:
A subsoil plow having a plurality of forwardly facing C-shaped plow teeth arranged on a rigid frame in a generally V-shaped array. Each plow tooth has an upper portion, a curved shank portion, and a bottom tip and is mounted on the frame by a so-called pivot bolt located directly above the tip of the tooth and by a shear bolt spaced from the pivot bolt, the shear bolt being adapted to fail in shear upon application of a predetermined load to the plow tooth, such as may be occasioned upon the tooth striking an underground object as the plow is pulled through the field, so as to release the tooth and to permit it to swing upwardly and rearwardly about the pivot bolt without the tip of the tooth digging deeper into the ground.
Also disclosed is a hitch which enables the plow to readily be coupled to a tractor equipped either with a category 2 or 3N or a category 3 three point hitch with or without an automatic coupler.
REFERENCES:
patent: 2091427 (1937-08-01), Brodersen
patent: 2209083 (1940-07-01), Du Vall
patent: 3231294 (1966-01-01), Horney
patent: 3275341 (1966-09-01), Ralston
patent: 3450212 (1969-06-01), Sylvester
patent: 3472528 (1969-10-01), Richey
patent: 3559747 (1971-02-01), Cline
Grain Systems, Inc.
Johnson Richard J.
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