Spring reset mechanism for tillage tool

Details Spring reset mechanism for tillage tool Spring reset mechanism for tillage tool

1983-10-13

1985-10-22

Johnson, Richard J.

Earth working

Overload shifting

Against spring return device

172705, A01B 6104

Patent

active

045482772

ABSTRACT:
A spring reset mechanism for a ground engaging tool includes a four-bar linkage mounting for the tool. A fixed cam surface is mounted to one of the links and a roller cam carried by a guide link is spring-biased against the cam surface to urge the tool into its working position. As the tool nears the limit of its raised position, a recess in the cam surface receives the roller to reduce the rate of spring compression and enable the tool to clear an obstruction without substantially increasing the resistance force. Further, as the tool raises, the resistance moment arm decreases which further facilitates clearing a large obstruction. The reset force characteristics may be changed by simple and economical design changes.

REFERENCES:
patent: 3191688 (1965-06-01), Morkoski
patent: 3202223 (1965-08-01), Fulton
patent: 3321027 (1967-05-01), Johnson
patent: 4040491 (1977-08-01), Dietrich
patent: 4077478 (1978-03-01), Neukom
patent: 4128130 (1978-12-01), Green

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