Spring cushioned shank for earthworking chisel having trip mecha

Details Spring cushioned shank for earthworking chisel having trip mecha Spring cushioned shank for earthworking chisel having trip mecha

1978-05-08

1980-04-29

Johnson, Richard J.

Earth working

Overload shifting

Against spring return device

172705, A01B 6104, A01B 3524

Patent

active

042001579

ABSTRACT:
A shank assembly for tools, such as those used in tillage on farm implements, is provided with mechanism which, during use, will yield horizontally, yet not trip, when the tool encounters certain abnormal resistances, e.g. frozen or compact soils, thereby maintaining the tool in its proper attitude, which will trip in response to the tool encountering relatively immovable obstructions, for example large, heavy rocks, and which will automatically reset after the tool has cleared the obstruction.

REFERENCES:
patent: 3052308 (1962-09-01), Quanbeck
patent: 3098531 (1963-07-01), Hunter
patent: 3125167 (1964-03-01), Mannheim
patent: 3191688 (1965-06-01), Morkoski
patent: 3223175 (1965-12-01), Twidale
patent: 3245480 (1966-04-01), Quanbeck
patent: 3277967 (1966-10-01), Weispfenning
patent: 3292713 (1966-12-01), Mannheim
patent: 3326300 (1967-06-01), Morkoski
patent: 3439748 (1969-04-01), Ward
patent: 3589448 (1971-06-01), Gay

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