Gear reduction arrangement for variable speed power driven tool

F - Mech Eng,Light,Heat,Weapons – 16 – H

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143/11, 74/266

F16H 35/06 (2006.01) B23D 55/06 (2006.01) B23Q 5/14 (2006.01) F16H 3/00 (2006.01)

Patent

CA 1186530

GEAR REDUCTION ARRANGEMENT FOR VARIABLE SPEED POWER DRIVEN TOOL ABSTRACT A power tool, is adapted to be driven by an external drive means such as a portable, hand held drill, through a novel gear reduction arrangement in which a selected pinion gear and an idler gear are supported between a gear case cover and the tool frame. The gear reduction arrangement provides for a gear case cover having a support position for a pinion and a plurality of support positions for the idler gear. The idler gear support positions are placed at varying distances from the pinion gear position to accommodate pinion gears of various sizes and numbers of teeth, thereby to permit the tool to be operated at a plurality of gear reduction ratios.

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