Earth working – Overload shifting – Against spring return device
Patent
1980-01-25
1982-01-26
Johnson, Richard J.
Earth working
Overload shifting
Against spring return device
172699, 172268, A01B 1308, A01B 6104
Patent
active
043124089
ABSTRACT:
An assembly for mounting the shank of a ground tool to a clamping plate carried on the tool bar of a soil tilling farm implement. The mounting assembly has a mounting member for attachment to the clamping plate, a first pivotal connection of the tool shank with the mounting member, and a variable pressure unit associated with the tool shank and the mounting member for applying a variably decreasing pressure on the ground tool during movement thereof from an operating position to an inoperative position. The pressure applied by the variable pressure unit, in a first moved position therefor, acts to initially hold the ground tool in the operating position, and in a second moved position being rendered ineffective to return the ground tool to the operating position. The variable pressure unit is movable from the first position to the second position therefor by movement of the ground tool, in response to striking an obstruction in the soil, and provides for the initial application of a counter pressure on the tool greater than the initial tool holding pressure applied by the variable pressure unit.
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patent: 4116281 (1978-09-01), Lant
Johnson Richard J.
Lowell Rudolph L.
Pingel G. Brian
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