Tension reducer for a power tool drive apparatus

Details Tension reducer for a power tool drive apparatus Tension reducer for a power tool drive apparatus

1992-05-11

1993-04-27

Bray, W. Donald

Woodworking

Shaping machine

Heel forming

144136R, 144145A, 409 97, 409110, 474110, 474114, B27C 502

Patent

active

052053318

ABSTRACT:
A tension reducer for a tension controller for use on a power tool such as an inverted router. The router has a drive motor, a motor driven pulley, a router bit-carrying spindle moveable between a lowered inoperative position and an raised cutting position, a drive belt for transferring rotational motion from the motor driven pulley to the spindle, and a drive belt tension control apparatus. The drive belt tension control apparatus includes a mount for mounting the motor driven pulley in continuously variable spaced-apart relation to the spindle during operation of the router and a pressure source for exerting a predetermined pressure on the motor driven pulley and thereby a predetermined tension on the drive belt during operation of the router for rotating the spindle. A tension reducer reduces the tension on the spindle during movement of the spindle between its lowered inoperative position and raised cutting positions for preventing tension-induced hesitation in the movement of the spindle.

REFERENCES:
patent: 4893661 (1990-01-01), Onsrud

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