Soil undercutter with trip release for pivotally mounted shank

Details Soil undercutter with trip release for pivotally mounted shank Soil undercutter with trip release for pivotally mounted shank

1979-09-12

1981-10-06

Marlo, George J.

Earth working

Overload shifting

Against spring return device

172720, A01B 6104

Patent

active

042930430

ABSTRACT:
The present invention relates to a shank assembly for a soil undercutter, which is similar to an extremely wide cultivator shovel which travels underneath the ground and cuts the roots from weeds and plants without substantially disturbing the surface of the ground. The shank assembly position can be adjusted by changing the length of a link which holds the shank assembly in position. As shown the link includes a spring trip with a near center type toggle trip release that prevents "floating" and will hold the blade in position until an obstacle is encountered. The shank and spring mounting rod are pivotally mounted with respect to a common pivot, and when the blade encounters an obstruction the toggle linkage releases permitting the shank to pivot rearwardly and upwardly, while the toggle linkage compresses the spring. The trip will automatically reset after the blade clears the obstruction.

REFERENCES:
patent: 247756 (1881-10-01), Grissinger
patent: 2565668 (1951-08-01), Simpson
patent: 2944613 (1960-07-01), Anderson
patent: 4167977 (1979-09-01), Geurts

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