Fluid control system for roadway grooving apparatus

Details Fluid control system for roadway grooving apparatus Fluid control system for roadway grooving apparatus

1989-02-14

1990-11-06

Kisliuk, Bruce M.

Mining or in situ disintegration of hard material

Automatic control; signaling or indicating

Of hard material disintegrating machine

299 39, E01C 2309

Patent

active

049680994

ABSTRACT:
A machine for cutting spaced grooves in a concrete road surface includes at least two laterally-spaced hydraulic cylinders which apply downward operating forces on a travelling cutter head. Each cylinder is individually pressurized through a pressure line that incorporates a pressure reducing valve and a pressure relief valve. The pressure setting for the relief valve is slightly higher than the setting of the reducing valve, such that the cylinder pressure is closely maintained between a high limit established by the relief valve and a low limit established by the reducing valve.

REFERENCES:
patent: 2270943 (1942-01-01), Freundel et al.
patent: 2311891 (1943-02-01), Tyson
patent: 3608969 (1971-09-01), Fowkes
patent: 4353289 (1982-10-01), Lonnemo

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