Agricultural implement

Details Agricultural implement Agricultural implement

1983-07-20

1986-01-14

Johnson, Richard J.

Earth working

Overload shifting

Against spring return device

172710, A01B 6104

Patent

active

045640742

ABSTRACT:
An agricultural implement such as a cultivator includes a support body and a ground treatment tool depending from the support body for pivotal movement forwardly to and rearwardly from a work position.
Means is connected to the support body for biasing the tool to its work position. This biasing means and the ground treatment tool are pivotally coupled at spaced locations to a lever which slidably rests between such locations on a roller providing a fulcrum for the lever. As the tool retracts in response to a pre-determined resistance to its forward movement through or along the ground, it pulls the lever across and about the roller against the biasing means, resulting in relative movement of the fulcrum along the lever and consequent variation in the effective biasing force on the tool.

REFERENCES:
patent: 3275086 (1966-09-01), Morris
patent: 3365002 (1968-01-01), Jacobs
patent: 3529673 (1970-09-01), Morris
patent: 3606928 (1971-09-01), Quanbeck
patent: 4040491 (1977-08-01), Dietrich
patent: 4116281 (1978-09-01), Lant

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