Automatic support system for a screed

Details Automatic support system for a screed Automatic support system for a screed

1974-07-26

1977-05-31

Byers, Jr., Nile C.

Road structure, process, or apparatus

Apparatus

Automatic control

E01C 1900

Patent

active

040266583

ABSTRACT:
An asphalt finishing machine includes a tractor and a screed of the free floating type wherein the latter is towed behind the tractor by a pair of draft arms pivotally connected at their forward ends to the frame of the tractor. A pair of hydraulic cylinders is connected to the tractor and to the screed for lifting the latter away from the roadway mat when the finishing machine is transported from one job site to another. A control system is connected with these cylinders and is automatically and instantaneously brought into operation, by means of a pressure-sensitive switch, whenever forward motion of the finishing machine is arrested, as when the hopper is being refilled, for actuating the hydraulic cylinders to develop a lifting force having a magnitude at least 80 to 90% of the force developed by the dead-weight of the screed thereby to prevent the screed from settling into the mat during such periods of time when forward motion of the finishing machine is stopped.

REFERENCES:
patent: 2591502 (1952-04-01), Bohannan
patent: 2973723 (1961-03-01), Hudis
patent: 3015258 (1962-01-01), Apel
patent: 3043201 (1962-07-01), Maxon
patent: 3137219 (1964-06-01), Hudis
patent: 3403609 (1968-10-01), Bradshaw
patent: 3533336 (1970-10-01), Wikel
patent: 3533337 (1970-10-01), Swisher
patent: 3559543 (1971-02-01), Schwoebel

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