Patent ID: 8152602
Filing Date: 2012-04-10
Classification: B23Q,B28D

Abstract:
1. A power tool comprising: a rotating cylindrical hollow shaft about a first axis; a ring gear coupled to the shaft; and a casing housing the hollow shaft and ring gear, the casing having upper and lower openings about the first axis, the upper opening coupled to a vacuum apparatus providing negative pressure with respect to atmosphere, the upper and lower openings together with the hollow shaft forming a conduit to collect dust from a work piece created as a byproduct from use of the power tool, and wherein the hollow shaft further comprising: a 30 degree taper at a proximal end to slip fit components with close tolerances: a second threaded portion approximately at a middle area of the hollow shaft, the second threaded portion engaging a ring gear; a ring gear seat wherein the ring gear seat is an abutment to the ring gear, wherein the ring gear further includes two cavities to engage a spanner wrench for assembling and disassembling the ring gear with respect to the hollow shaft.