Earth working – With earth marker
Patent
1986-08-12
1989-05-02
Johnson, Richard J.
Earth working
With earth marker
172271, 403 2, A01B 3914
Patent
active
048259578
ABSTRACT:
An improved breakaway assembly for preventing damage to markers for agricultural equipment when such markers encounter obstacles during use. The improved breakaway assembly includes an elongated member for holding the marker in place, imparting only tension forces onto such elongated member and minimizing the amount of shearing forces typically encountered by prior art shear pins. The elongated member is generally positioned tangentially to an arc formed by rotation of the point of attachment of such elongated member about the vertical axis on which the marker pivots when an obstruction is encountered.
REFERENCES:
patent: 1207146 (1916-12-01), Dickinson
patent: 1214974 (1917-02-01), Urban
patent: 1780112 (1930-10-01), Bowman
patent: 1947552 (1934-02-01), Huddle
patent: 2612827 (1952-10-01), Bagette
patent: 3627057 (1971-12-01), Hartwig
patent: 3922104 (1975-11-01), McCullough
patent: 4147305 (1979-04-01), Hunt
John Deere Operator's Manual 7000 Conservation 4 Row and 6 Row Narrow Max--Emerge Drawn Planters, pp. 27 and 96, 5-1982.
Erickson William E.
White Gregory S.
Deere & Company
Johnson Richard J.
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