Lower link draft sensing system on tractor

Details Lower link draft sensing system on tractor Lower link draft sensing system on tractor

1980-03-24

1981-10-20

Stouffer, Richard T.

Earth working

Automatic power control

Draft responsive

A01B 63112

Patent

active

042955300

ABSTRACT:
Tractor hydraulic power lift mechanisms may have automatic draft control signals fed back to them from lower link draft force sensing systems. One such system has two bowed rearwardly-extending leaf springs anchored to the tractor frame at their front ends, two laterally-spaced arms pivoted at their upper ends to the tractor frame and at their lower ends to the rear ends of the respective springs, a cross-bar universally supported by the lower ends of the respective arms and having two attachment points laterally offset from said arms to which the front ends of respective lower hitch links are universally connectible, and linkage for deriving a control signal from the fore and aft displacement of the mid-point of the cross-bar. However, the cross-bar is stressed in bending to the detriment of the control signal accuracy. To avoid this, a summating bar is universally connected between said arms and the control signal derived from a point on the unstressed summating bar.

REFERENCES:
patent: 3342274 (1967-09-01), Wridt, Jr.
patent: 3375876 (1968-04-01), Engelmann
patent: 3399733 (1968-09-01), North
patent: 3527305 (1970-09-01), Dollase
patent: 4059159 (1977-11-01), Moorhouse et al.

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