Hydraulic valve control linkage

Harvesters – Motorized harvester – With condition-responsive operation

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Details

56 108, 56DIG15, 180333, A01D 6903

Patent

active

049744003

ABSTRACT:
A control linkage for use on a tractor to control hydraulic implements associated therewith is disclosed wherein a control lever controlling the raising and lowering of the header forming a part of an implement mounted on a tractor is provided with a control device detachably connected thereto and engageable with a second control lever operably controlling the speed of a hydraulic motor powering the components of the implement attached to the tractor. The control device automatically moves the control lever for the speed of the hydraulic motor to a slow position whenever the header lift control lever is moved to effect a raising of the header relative to the ground. The speed control lever is spring-loaded toward the fast position so that a return of the header lift control lever to lower the header into an operating position will result in an automatic return of the speed control lever to a fast position. The spring-loading mechanism includes a bayonet slot in a bracket in which an anchoring pin is movable such that a positioning of the anchoring pin in a hook portion of the bayonet slot anchors the mechanism for exerting a biasing force on the speed control lever, while a positioning of the anchoring pin into the slide portion of the bayonet slot will permit the pin to move with the speed control lever without anchoring the spring-loading mechanism.

REFERENCES:
patent: 3135234 (1964-06-01), Tweridge
patent: 3611827 (1971-10-01), Bottum
patent: 3736737 (1973-06-01), Schumacher, II et al.
patent: 4059171 (1977-11-01), Pakosh
patent: 4612757 (1986-09-01), Halls et al.
patent: 4685340 (1987-08-01), Shust et al.

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