Patent ID: 9700979
Date: 2017-07-11
CPC Classifications: B23B,B23Q,F16H,Y10T

Claim:
1. A belt drive for a power tool, comprising; a housing; a motor mounted connected to the housing, the motor having a motor shaft; a first stepped pulley on the motor shaft; a first belt on the first stepped pulley; a second stepped pulley connected to the first belt to receive rotational energy from the first stepped pulley via the first belt; a second belt on the second stepped pulley; a third stepped pulley connected to the second belt to receive rotational energy from the second stepped pulley via the second belt; a tool connected to the third stepped pulley; a belt tension roller configured to bear against one of the first belt and the second belt; an offset shaft on which the belt tension roller is mounted, the offset shaft being pivotable in a range of possible positions wherein the range of possible positions include positions bearing against the one of the first and second belts to a greater or lesser extent; and an adjustment apparatus configured for adjusting a position of the belt tension roller by pivoting the offset shaft and for securing the belt tension roller in a position, the adjustment apparatus includes a user operable control at a first end of the belt tension roller that transmits an engaging force along an axis of the belt tension roller to fasten a second opposite end of the belt tension roller in a selected position to a stationary anchor plate.