Means for controlling the stroke of a hydraulic cylinder

Details Means for controlling the stroke of a hydraulic cylinder Means for controlling the stroke of a hydraulic cylinder

1999-01-20

1999-11-02

Novosad, Christopher J.

Earth working

With ground support vertically adjustable relative to frame

Power operated adjustment

172423, A01B 6322

Patent

active

059752157

ABSTRACT:
Structure for controlling the stroke of a hydraulic cylinder, especially where the hydraulic cylinder is utilized on farm implements where field operation height control is necessary. The farm implement includes a frame having at least a wheel support pivotally secured thereto which supports a ground-engaging wheel thereon. A hydraulic cylinder is operatively connected to the frame and to the wheel support whereby extension of the hydraulic cylinder causes the frame to be raised relative to the ground and whereby retraction of the hydraulic cylinder causes the frame to be lowered with respect to the ground. An adjustable valve support is positioned in the pivotal path of the hydraulic cylinder and supports a valve thereon having a plunger extending therefrom which controls the operation of the valve. An actuator is movably positioned on the hydraulic cylinder and is adapted to engage the plunger of the valve to close the normally open valve upon predetermined movement of the hydraulic cylinder. The closing of the valve by the actuator moving with the hydraulic cylinder discontinues the flow of hydraulic fluid to the cylinder thereby limiting the stroke of the cylinder.

REFERENCES:
patent: 2914125 (1959-11-01), Tanke et al.
patent: 2967725 (1961-01-01), Roberson
patent: 3993413 (1976-11-01), Cox et al.
patent: 4189009 (1980-02-01), Welch
patent: 4967851 (1990-11-01), Barber
patent: 5086847 (1992-02-01), Meiners
patent: 5143160 (1992-09-01), May
patent: 5234060 (1993-08-01), Carter
patent: 5641026 (1997-06-01), Balmer

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