Control change system for a hydraulic work vehicle

Details Control change system for a hydraulic work vehicle Control change system for a hydraulic work vehicle

1992-05-11

1993-08-17

Look, Edward K.

Power plants

Pressure fluid source and motor

Having plural energy outputs

91521, 91529, 91461, 137596015, F16D 3102

Patent

active

052358119

ABSTRACT:
A control change system for a backhoe in a construction vehicle, comprising a plurality of pilot valves for generating a pilot pressure corresponding to operations of a first and a second control levers, respectively, and a hydraulic switching unit for relaying the pilot pressure from the pilot valves and supplying the pilot pressure to a plurality of control valves. This switching unit includes a plurality of slidable spools for supplying the pilot pressure from the pilot valves selectively to the control valves. The control system further includes a first and a second switching members for selectively sliding the plurality of slidable spools. The first switching member is operable to select the swing cylinder or the hydraulic motor to be controlled by a shift in one direction of the first control lever. The second switching member is operable to switch interlocks between the first and second control levers and a boom cylinder and an arm cylinder.

REFERENCES:
patent: 1020176 (1912-03-01), Astfalck
patent: 4398861 (1983-08-01), Shimoie
patent: 4622998 (1986-11-01), Kussel et al.
patent: 4736647 (1988-04-01), Shimoie et al.
patent: 4986165 (1991-01-01), Miyaoka

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