Agricultural soil-working apparatus

Details Agricultural soil-working apparatus Agricultural soil-working apparatus

1976-03-15

1978-04-11

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, 111 84, 172573, 172500, 172624, A01C 506

Patent

active

040834123

ABSTRACT:
An agricultural seed-drill comprises a frame and pivotally mounted drag bar carrying a coulter disc. An ovoid rubber spring is located between the drag bar and a member, such as a moving beam or bell crank lever, associated with the frame to apply pressure to the coulter, or to enable the coulter to be raised so that the disc does not contact the soil. In order to relieve strain on the spring member when the coulter is raised, the said spring member and associated threaded studs, used to attach the spring member to the drag arm and the member associated with the frame, contain a continuous longitudinal axial passageway in which is located a cable the end portions of which extend through the studs and are terminated by nipples spaced apart from the end of the studs. By this means the weight of the drag arm is taken by the cable when the drag arm is in the raised position.

REFERENCES:
patent: 264921 (1882-09-01), Bemis
patent: 1156376 (1915-10-01), Smith
patent: 1671764 (1928-05-01), Dickey
patent: 2361496 (1944-10-01), Pointer
patent: 3570605 (1971-03-01), Riki
patent: 3611956 (1971-10-01), Moore
patent: 3845730 (1974-11-01), Koronka

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