Device for automatically lifting and rapidly lowering tractor im

Details Device for automatically lifting and rapidly lowering tractor im Device for automatically lifting and rapidly lowering tractor im

1979-06-07

1981-04-07

Watson, Robert C.

Earth working

Automatic power control

Draft responsive

254124, A01B 63112

Patent

active

042600251

ABSTRACT:
A device for lifting an implement carried by an agricultural tractor three-point linkage has a flexible bar connected at its ends to the said lower linkage arms for rotation about a transverse axis, the reaction forces transmitted from the ground to the implement, when the latter is lowered into the ground, causing flexural deformation of the bar in a horizontal plane to effect operation of a distributor control shaft through a linkage which includes a first lever fixed at one end to the center of the bar, and acting through an inclined slot and pin on a second lever so that the weight of the implement when lifted from the ground causes the linkage arms to rotate about their connections to the respective tie-rods, deforming the flexible bar in a vertical plane and causing rotation of the distributor control shaft in a sense to return the implement rapidly to the ground.

REFERENCES:
patent: 3191687 (1965-06-01), Bunting
patent: 3497015 (1970-02-01), Ward

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