Patent ID: 7360312
Filing Date: 2008-04-22
Classification: A01D,F16H

Abstract:
1. A bush cutter comprising: a handle pole having proximal and distal end portions; a driving shaft extending lengthwise through the handle pole; a drive source disposed at the proximal end portion of the handle pole for rotationally driving the driving shaft; a gearbox fixed at the distal end portion of the handle pole, a driving bevel gear housed in the gearbox and mounted on a distal end portion of the driving shaft to be rotated by rotation of the driving shaft; a driven bevel gear engaging with and rotationally driven by the driving bevel gear; an output shaft connected to be rotated by rotation of the driven bevel gear; a cutting blade mounted on the output shaft; a first bearing rotatably supporting the driving bevel gear and mounted in an axially longitudinally movable manner relative to the gearbox to allow adjustment of engagement of the driving bevel gear with the driven bevel gear, the first bearing comprising a screw-in support member having a male thread formed on an outer peripheral surface thereof and threadedly engaged with a female thread formed on an inner peripheral surface of the gearbox so that turning of the screw-in support member in either direction effects axial longitudinal movement thereof relative to the gearbox to thereby adjust engagement of the driving bevel gear with the driven bevel gear, and a first journal bearing supported by the screw-in support member and rotatably supporting a boss of the driving bevel gear; and second and third bearings rotatably supporting opposite ends of the output shaft.