Down pressure control mechanism for grain drills

Details Down pressure control mechanism for grain drills Down pressure control mechanism for grain drills

1977-02-22

1978-03-07

Wright, Jr., Ernest T.

Earth working

Overload shifting

Against spring return device

111 59, 111 85, 172414, 172500, 172502, 172572, A01B 6100, A01C 500

Patent

active

040774783

ABSTRACT:
A down pressure control for use with furrow openers in grain drills which provides a spring load for maintaining down pressure on the furrow opener during normal operating conditions and which can be at relatively high rate to permit minimum tillage, or work in hard ground, but yet will release upon excessive movement of the furrow opener to prevent overstressing the hold down springs. The down pressure control is used in combination with an individual depth control for each of the furrow openers to insure that each furrow opener is individually controlled as to down pressure and depth.

REFERENCES:
patent: 520843 (1894-06-01), Carpenter
patent: 536231 (1895-03-01), Pickett
patent: 626822 (1899-06-01), Baseman
patent: 753452 (1904-03-01), Van Brunt
patent: 2155443 (1939-04-01), Parks et al.
patent: 2738969 (1956-03-01), Morris et al.
patent: 3005426 (1961-10-01), Sorensen et al.
patent: 3228363 (1966-01-01), Gardner et al.
patent: 4004640 (1977-01-01), Bland
patent: 4030428 (1977-06-01), Traux

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