Hydraulically controlled steering for power trowel

Details Hydraulically controlled steering for power trowel Hydraulically controlled steering for power trowel

1997-01-23

1998-10-06

Graysay, Tamara L.

Road structure, process, or apparatus

Apparatus

Tool rotating in horizontal plane

E01C 1922

Patent

active

058167404

ABSTRACT:
A self-propelled power trowel, for finishing a concrete surface, is provided, having a rigid frame adapted to be disposed over a concrete surface, an engine assembly, and at least a pair of rotor assemblies having rotatable trowel blades. The rotor assemblies are tiltable relative to the frame. Dual-action hydraulic cylinders are provided interconnected between the frame and the rotor assemblies for selectively tilting the rotors to provide steering control to the power trowel. The hydraulic fluid is delivered to the cylinders at variably selectable but constant pressures through the proportional pressure output control valves.

REFERENCES:
patent: 4046484 (1977-09-01), Holz, Sr. et al.
patent: 4775306 (1988-10-01), Kikuchi et al.
patent: 5108220 (1992-04-01), Allen et al.
patent: 5480258 (1996-01-01), Allen
patent: 5584598 (1996-12-01), Watanabe et al.
patent: 5613801 (1997-03-01), Allen

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