Patent ID: 6592290
Filing Date: 2003-07-15
Classification: E04F

Abstract:
A power trowel for finishing a concrete surface, said power trowel comprising:a rigid frame assembly adapted to be disposed over said concrete surface; an engine assembly for rotating a drive shaft, said engine assembly attaching to said frame assembly; at least one rotor assembly for frictionally contacting said concrete surface and supporting said frame assembly above said concrete surface, said rotor assembly tiltably connected to said frame assembly and operably connected to said engine assembly through use of a transmission system for transmitting rotation of said drive shaft to said rotor assembly; and at least one transmission system comprising said drive shaft and at least one gearbox attached to said rigid frame assembly, wherein said gearbox comprises an input shaft having a first bevel gear for intermeshing cooperation with a second bevel gear of an intermediate shaft located within said gearbox, said intermediate shaft further comprising a first helical gear, said first helical gear formed for intermeshing cooperation with a second helical gear located on an output shaft, said output shaft further comprising said second helical gear, said output shaft for cooperating with said rotor assembly to transfer the rotation of said drive shaft to the rotation of said rotor assembly.