Road structure – process – or apparatus – Apparatus – Tool rotating in horizontal plane
Patent
1995-07-07
1997-03-25
Neuder, William P.
Road structure, process, or apparatus
Apparatus
Tool rotating in horizontal plane
E01C 1900
Patent
active
056138016
ABSTRACT:
A high performance twin engine riding trowel for finishing concrete. A rigid frame mounts two downwardly projecting rotors that counter-rotate simultaneously. A guard cage mounted to the frame prevents inadvertent contact between the rotors and foreign objects. An operator sits in a seat mounted to the frame and steers the rotors with a pair of primary control levers that tilt the rotors to generate steering forces. The longitudinal pitch of the blades on each rotor is adjustable. Throttle controls are interconnected to synchronize the engines at low throttle and higher speeds. Illumination may be provided by lights mounted on the frame. Each engine slidably mounts a generally parallelepiped block attached to the frame. The engines counter-rotate while establishing generally coaxial, horizontal axes of rotation. Each engine drives a rotor through a belt system attached to a driveshaft. Both drive shafts establish generally coaxial axes of rotation that are generally parallel to the axes of rotation of the engines. Each driveshaft extends to a gearbox to transfer power to the rotor. U-joints on each of the drive shafts facilitate independent movement of the gearboxes. The gearboxes are interchangeable and mounted to tiltable, pivot able steering boxes secured to the frame by a top plate. Each rotor establishes a generally vertical axis of rotation. Several equidistantly spaced blades extend radially outward from each rotor. The blades contact plastic concrete to finish the surface while supporting the trowel.
REFERENCES:
patent: 3936212 (1976-02-01), Holz, Sr. et al.
patent: 4046484 (1977-09-01), Holz, Sr. et al.
patent: 4773306 (1988-10-01), Kikuchi et al.
patent: 5480258 (1996-01-01), Allen
Allen Engineering Inc.
Carver Stephen D.
Neuder William P.
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