Attitude control for implement

Details Attitude control for implement Attitude control for implement

1977-02-07

1978-11-21

Purser, Ernest R.

Motors: expansible chamber type

Relatively movable working members with one having motive...

Moving cylinders

13759612, 173 43, 214771, 299 37, 91183, B66F 900

Patent

active

041260830

ABSTRACT:
In a vehicle including a stick cylinder movable to change the attitude of a stick relative to a boom, and an implement cylinder movable to change the inclination of an implement relative to the stick, hydraulic circuit means are provided for serially connecting the cylinders so that as the stick cylinder moves the stick in one direction, discharge of fluid from the stick cylinder is used to actuate the implement cylinder to maintain substantially the same attitude of the implement relative to the ground. A flow divider is interposed between the cylinders to provide the desired degree of actuation of the implement cylinder in response to actuation of the stick cylinder. A dual pressure-responsive bypass valve provides a relatively high pressure relief to the implement cylinder when the implement cylinder is operated independently of the stick cylinder and provides a relatively low discharge path for the implement cylinder when operated in series with the stick cylinder.

REFERENCES:
patent: 3179120 (1965-04-01), Erickson et al.
patent: 3251277 (1966-05-01), Stacey
patent: 3374975 (1968-03-01), Bronder
patent: 3395816 (1968-08-01), Hodges et al.
patent: 3563137 (1971-02-01), Graber
patent: 3868145 (1975-02-01), Cobb
patent: 4066004 (1978-01-01), Alcalay

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