Hydraulically controlled twin rotor riding trowel

Details Hydraulically controlled twin rotor riding trowel Hydraulically controlled twin rotor riding trowel

1998-03-31

2000-04-25

Lillis, Eileen Dunn

Road structure, process, or apparatus

Apparatus

Tool rotating in horizontal plane

451353, E01C 1922

Patent

active

060536608

ABSTRACT:
A high performance, twin rotor riding trowel for finishing concrete and hydraulic circuitry therefor, enabling complete joystick control to the operator. The rigid trowel frame mounts two spaced-apart, downwardly-projecting, bladed rotor assemblies that frictionally engage the concrete surface. The rotor assembly blades finish the surface while supporting the trowel. The rotor assemblies are tilted with double acting, hydraulic cylinders to effectuate steering and control. Double acting hydraulic cylinders also control blade pitch. A joystick system enables the operator to hand control the trowel with minimal physical exertion. The joystick system activates electrical circuitry that fires solenoid control valves that in turn energize the various hydraulic cylinders that tilt the rotors and alter blade pitch. The hydraulic control circuitry comprises a motor driven pump delivering pressure to a flow divider circuit. A bypass-valve in line before the flow divider enables an operator to customize the trowel steering characteristics.

REFERENCES:
patent: 3412657 (1968-11-01), Colizza
patent: 3936212 (1976-02-01), Holz
patent: 4046484 (1977-09-01), Holz
patent: 5108220 (1992-04-01), Allen et al.
patent: 5480258 (1996-01-01), Allen
patent: 5816739 (1998-10-01), Allen

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