Motors: expansible chamber type – Working member position feedback to motive fluid control – Electrical input and feedback signal means
Patent
1982-05-25
1985-05-14
Richter, Sheldon J.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Electrical input and feedback signal means
60422, 60427, 74577R, 74583, 91513, 91522, 91530, F15B 1316
Patent
active
045164690
ABSTRACT:
An electric hydraulic control device for controlling hydraulic cylinders of work tools in a construction vehicle, in which control valves of the hydraulic cylinders are controlled in two ways. For some work tools which need not be controlled smoothly and finely, the corresponding control valves are controlled directly by an electric signal outputted according to the position of the operation levers, and for other work tools which must be controlled smoothly and finely, the corresponding control valves are controlled through an electric servo mechanism which is operated by an electric signal representative of the amount by which the operation lever is manipulated. In addition, there is provided a detector for detecting as to whether the transmission lever is in the locked condition, and electric systems of all of the control valves are rendered inoperative when the transmission lever is in the locked condition.
REFERENCES:
patent: 2175799 (1939-10-01), Hodgman
patent: 2643515 (1953-06-01), Harsch
patent: 3768367 (1973-10-01), Fuzzell
patent: 3818926 (1974-06-01), Wohlwend
patent: 3945206 (1976-03-01), Krause
patent: 4281526 (1981-08-01), Lipschultz
Maeo Hidemi
Sato Yoshito
Tsutsumi Yoshio
Yato Tokuhiro
Kabushiki Kaisha Komatsu Seisakusho
Meller Michael N.
Richter Sheldon J.
Smith Randolph A.
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