Device for controlling the pressure upon the ground of a screed

Details Device for controlling the pressure upon the ground of a screed Device for controlling the pressure upon the ground of a screed

1985-08-06

1987-07-28

Novosad, Stephen J.

Road structure, process, or apparatus

Apparatus

Automatic control

404118, E01C 1922

Patent

active

046829083

ABSTRACT:
A device for controlling the pressure of the extensible screed of a road paver on the material to be laid down, comprising hydraulic actuators capable of lifting the screed unit and structure for regulating the pressure of the hydraulic fluid without varying the vertical position of said screed, including distributors, non-return valves, maximum pressure valves and, at least one accumulating chamber, wherein an electric circuit for transmitting signals acts upon the hydraulic circuit to adjust the pressure of the fluid in the actuators.

REFERENCES:
patent: 3158945 (1964-12-01), Curlett et al.
patent: 3285148 (1966-11-01), Munyon
patent: 3907451 (1975-09-01), Fisher et al.
patent: 3989402 (1976-11-01), James, III
patent: 3992124 (1976-11-01), Schrader
patent: 4026658 (1977-05-01), Newendorf et al.
patent: 4379653 (1983-04-01), Brown

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