Earth working – Tool – standard or connection – Spring biased or formed tool or tool part
Patent
1976-09-09
1977-12-20
Johnson, Richard J.
Earth working
Tool, standard or connection
Spring biased or formed tool or tool part
A01B 1902
Patent
active
040635988
ABSTRACT:
A soil cultivator comprising a supporting frame; means for attachment of said frame to a tractor; a first lever arm pivoted at one end to said frame, a second lever arm pivoted at an intermediate position to the other end of said first lever arm, said second lever arm being provided with a first arm portion extending downwardly below said intermediate pivot point and having secured thereto a shovel or the like soil working tool, and with a second arm portion integral with said first lever arm portion and extending upwardly above said intermediate pivot point, the free end of said second arm portion being into sliding engagement with a fixed guide element secured to said support frame, and being urged downwardly along said guide element by spring means, while it may be caused to slide upwardly along said guide means in opposition to the force of said spring by effect of the resistance opposed by the soil to the progress of the working tool, so as to only partially lift the working tool with respect to the soil by an amount proportional to the soil resistance encountered, while maintaining it at all times into substantial operating and working engagement with the soil.
REFERENCES:
patent: 1951701 (1934-03-01), Majar
patent: 2312405 (1943-03-01), Haagen
patent: 3042122 (1962-07-01), Anderson
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