Earth working – Overload shifting – Against spring return device
Patent
1976-05-28
1978-01-17
Marlo, George J.
Earth working
Overload shifting
Against spring return device
172268, 172269, 172744, A01B 6100
Patent
active
040687236
ABSTRACT:
A beam for supporting an earth working tool, such as a moldboard plow, which is made so that it will float vertically over obstacles that do not hook the earth working tool, and which also includes linkage that will trip to provide clearance over obstacles which cause a high resistance to floating. The unit utilizes tension springs placed to insure reliable operation, and yet which provide high holding forces for working conditions. Folding links are used to provide full tripping of the mechanism. The folding links are arranged in relation to the provided tension springs to keep spring expansion to a minimum during tripping and yet permit reliable tripping under high forces. The springs provide adequate pressure for resetting after clearing the obstacle.
REFERENCES:
patent: 637390 (1899-11-01), Howe et al.
patent: 839956 (1907-01-01), Reeves et al.
patent: 3321027 (1967-05-01), Johnson et al.
patent: 3605905 (1971-09-01), Bo
patent: 3662839 (1972-05-01), Thorsrud
patent: 3901326 (1975-08-01), Geurts
patent: 3972374 (1976-08-01), Venable et al.
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