Road structure – process – or apparatus – Apparatus – Tool rotating in horizontal plane
Patent
1998-01-16
1999-10-19
Lisehora, James A.
Road structure, process, or apparatus
Apparatus
Tool rotating in horizontal plane
474 8, 474 18, 474 46, E01C 1922
Patent
active
059676965
ABSTRACT:
A powered concrete finishing trowel comprises a variable ratio drive train to power one or more revolving rotors. One or more internal combustion motors power two or more downwardly projecting rotors comprising blades that frictionally contact the concrete surface. The rotors are shaft driven by reduction gear boxes. By tilting the rotors steering forces are developed. A variable gear drive unit comprises a variable ratio pulley driven by the motor. A second pulley drives the gear box input shaft, with a drive belt entrained between the pulleys. A linear actuator projecting outwardly from a stationary mounting plate terminates at a bracket assembly whose opposite end is pivoted to a rigid stabilizer that structurally compliments the linear actuator, establishing a fulcrum action applied to the bracket center. The linear actuator deflects the bracket assembly to axially displace portions of the variable ratio pulley to change the effective pulley diameter. Concurrently, belt tension enables axial movement of the lower pulley halves, changing its effective diameter in response to drive belt pressure. The varying ratio between effective pulley diameters establishes a variable drive gear ratio.
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"Hi-Lo Variable Speed Pulley Drives" brochure by Hi-Lo Manufacturing Co. Prtd. Nov. 1994.
"TS 78 Multi-Lap Ride-On Power Trowel" Spec Sheet by Bartell Powell Products.
Bartell "Power Trowels" Brochure .
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Allen J. Dewayne
Guinn Timmy D.
Allen Engineering Corporation
Carver Stephen D.
Lisehora James A.
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