Rubber spring for furrow opener

Details Rubber spring for furrow opener Rubber spring for furrow opener

1982-04-19

1984-05-15

Johnson, Richard J.

Earth working

With actuator adapted to lift tool for transport on wheeled...

Plural tools, individually spring biased down, lifted as unit

267153, 267 63R, 172573, 172500, 111 84, A01C 506

Patent

active

044482590

ABSTRACT:
A pre-stressed columnar rubber spring interposed between the pressure beam and pivoted draw bar tube of a no-till seed drill deflects under load in one direction only and the force causing increased spring deflection in the principle operational range increases to a desired maximum and then remains substantially constant or decreases slightly thereby relieving the machine of excess stresses caused by contact of coulters and openers with rocks and other field obstructions.

REFERENCES:
patent: 2361496 (1944-10-01), Pointer
patent: 2917302 (1959-12-01), Mattern
patent: 3195918 (1965-07-01), Poole
patent: 3315951 (1967-04-01), Boschi
patent: 3461816 (1969-08-01), Beck
patent: 3570605 (1971-03-01), Rikli
patent: 3845730 (1974-11-01), Koronka
patent: 4083412 (1978-04-01), Stocks
patent: 4116140 (1978-09-01), Anderson

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