Road structure – process – or apparatus – Apparatus – Tool rotating in horizontal plane
Patent
1999-03-29
2000-07-18
Lillis, Eileen Dunn
Road structure, process, or apparatus
Apparatus
Tool rotating in horizontal plane
404112, B01D 1100
Patent
active
060897864
ABSTRACT:
A high performance, twin rotor riding trowel for finishing concrete and a joystick operated electro-hydraulic control circuit enabling complete joystick control to the operator. The rigid trowel frame mounts two spaced-apart, downwardly projecting, and bladed rotors that frictionally contact the concrete surface. The rotors 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 proportional joystick system directly controls electrical circuitry that outputs proportional control signals to electrically controlled, proportional, pressure-reducing valves in line with the tilting cylinders. The hydraulic 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.
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Allen J. Dewayne
Guinn Timmy D.
McKean Michael W.
Addie Raymond
Allen Engineering Corp.
Carver Stephen D.
Lillis Eileen Dunn
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