Dual action earth working implement

Details Dual action earth working implement Dual action earth working implement

1994-05-12

1996-10-01

Warnick, IV, Spencer K.

Earth working

Overload shifting

Against spring return device

172264, A01B 6104

Patent

active

055604331

ABSTRACT:
An earth working implement including a frame having at least one earth working tool mounted thereon. A spring biased linkage assembly connects the tool to the frame to allow for vertical "floating" and "tripping" movements of the tool. The linkage assembly includes upper and lower generally parallel links which are pivotally connected to the frame and to a generally vertical standard having the tool connected to the lower end thereof. The upper link is formed from a pair of toggle elements defining a pivotal connection between opposite ends thereof. A spring assembly normally maintains the toggle elements in non-collapsible relation relative to each other and inhibits floating movements of the tool as it is drawn through the soil. The spring mechanism furthermore allows the toggle elements to move to a collapsed position relative to each other thereby allowing the tool to move to a tripped position. The upper and lower links of the linkage assembly are connected by a series of pivotal connections arranged in a quadrilateral formation relative to each other and such that a 1600 pound preload spring tension setting on the spring assembly advantageously requires a 4600 pound draft condition to abe applied to the tool before the tool begins to float and a draft condition ranging between 4200 and 6800 pounds is required to be imparted to the tool before the spring mechanism allows the tool to be moved to a tripped position. The implement of the present invention further includes a mechanism for adjusting the level of draft force required to be imparted to the tool before the tool is moved to a tripped position.

REFERENCES:
patent: 3321027 (1967-05-01), Johnson et al.
patent: 3972374 (1976-08-01), Venable et al.
patent: 3976144 (1976-08-01), Ralston et al.
patent: 4036305 (1977-07-01), Kinzenbaw
patent: 4128130 (1978-12-01), Green et al.
patent: 4161986 (1979-07-01), Ward
patent: 4703810 (1987-11-01), Meiners
patent: 4865132 (1989-09-01), Moore, Jr.
Booklet entitled "7500 Vari-Width Moldboard Plow, Semi-Mounted In-The-Furrow Type" Rac 9-19092, Copyright .COPYRGT. 1992 Case Corporation (50 pages).

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