Patent ID: 8596427
Filing Date: 2013-12-03
Classification: B24B,B25F

Abstract:
1. An installment structure for a braking mechanism for braking an output shaft of a motor in a power tool, the structure comprising: a tubular motor housing accommodating the motor; and a front housing mounted frontwardly of the motor housing with a shaft support plate configured to support an output shaft of the motor being provided between the front housing and the motor housing, the shaft support plate having a plurality of types available which includes a first shaft support plate adapted to be connected directly to the motor housing and a second shaft support plate adapted to be connected to the motor housing with a tubular spacer being provided between the second shaft support plate and the motor housing, the output shaft consists of a front shaft to be rotatably supported by the shaft support plate and a rear shaft disposed rearwardly of the front shaft, the front shaft being detachably connected to a rear shaft, the front shaft having a plurality of types available which includes a first front shaft adapted to be rotatably supported by the first shaft support plate and a second front shaft adapted to be rotatably supported by the second shaft support plate, the second front shaft being longer than the first front shaft in an axial dimension, wherein the braking mechanism includes a flange plate, a braking member and a biasing member, and is configured to be mounted to the second shaft support plate and the second front shaft such that the flange plate is fixed to the second front shaft, the braking member is movable between a braking position in which the braking member is pressed against the flange plate and a retreating position in which the braking member is separate from the flange plate, and the biasing member is configured to press the braking member toward the flange plate, whereby two modes of configuration are implementable which include: a first mode without the braking mechanism in which the first front shaft is connected to the rear shaft with the first shaft support plate being mounted between the motor housing and the front housing; and a second mode with the braking mechanism in which the second front shaft is connected to the rear shaft with the second shaft support plate and the spacer being mounted between the motor housing and the front housing.