Control for the hydraulic power lift of a tractor

Details Control for the hydraulic power lift of a tractor Control for the hydraulic power lift of a tractor

1977-05-23

1979-02-13

Stouffer, Richard T.

Earth working

Automatic power control

Draft responsive

A01B 63112

Patent

active

041390636

ABSTRACT:
A control for the hydraulic power lift of a tractor, particularly one used in agriculture. The control includes a pre-control slide valve which is adjustable not only by the pick-up or indicator of the working resistance or the position of a working implement but also by a rated or desired value pick-up, by way of a control linkage, to the control positions "lift", "neutral", and "lower". A first spring which urges the pre-control slide valve toward the lifting position, engages the control linkage to transmit the values of the working resistance. The force of this spring is greater than the force of the spring which continuously urges the pre-control slide valve towards the lowering position. The pick-up or indicator for the working resistance of the working implement is linked to the control linkage, against the force of the first spring, by way of a rod having a slotted hole.

REFERENCES:
patent: 2722873 (1955-11-01), Garmager
patent: 2964113 (1960-12-01), Presnell et al.
patent: 3331447 (1967-07-01), Simak

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