Patent ID: 7044682
Filing Date: 2006-05-16
Classification: E04F

Abstract:
1. A concrete finishing trowel comprising: a drive means having extending therefrom a drive shaft, said drive shaft connecting with and configured to rotate a rotatable blade assembly; said rotatable blade assembly adapted to finish a concrete surface, said rotatable blade assembly having a generally vertical axis of rotation and a plurality of radially spaced apart concrete finishing blades extending outwardly from said vertical axis for frictionally contacting said concrete surface, said blades each defining a longitudinal axis generally perpendicular to said vertical axis; a pitch controller for varying the pitch of said blades by rotating said blades about their longitudinal axis, said pitch controller utilizing the rotation of said drive shaft to supply the force necessary to rotate said blades about their longitudinal axis, wherein said pitch controller comprises a thrust collar, said thrust collar having a plate configured to bear downwardly on said rotatable blade assembly thereby varying the pitch of said blades by rotating them about their longitudinal axis, wherein said thrust collar further comprises a hollow shaft able to receive said drive shaft therethrough, said hollow shaft having a threaded exterior surface configured for receiving a nut thereupon; and, a clutch for selectively engaging and disengaging said pitch controller.