Patent ID: 6854937
Filing Date: 2005-02-15
Classification: B23Q,Y10S,Y10T

Abstract:
1. An attachment for a hand-held spiral saw power tool, comprising: a first rigid attachment portion, adapted to be secured to a forward portion of a hand-held spiral saw power tool in which a spiral saw bit is mountable, wherein the first attachment portion is structured and adapted to permit the first attachment portion to be secured to the forward portion of the power tool at various selected longitudinal positions therealong, so that when the first attachment portion is in a selected position on the power tool, the tip of a cutting portion of the spiral saw bit extends beyond the forward end of the first attachment portion by a distance at least equal to that of the thickness of the workpiece to be cut by the spiral saw, wherein the attachment portion is further adapted to permit a moving contact between a forward edge of the first attachment portion and an abutting surface of the workpiece to be cut by the spiral saw, the forward edge of the attachment portion being continuously flat, in a single plane, and defining an opening for the spiral saw, and wherein the attachment portion has an interior diameter at its forward edge which is more than two times greater than the diameter of the spiral saw, such that there is a substantial open space between the interior diameter of said forward edge of the attachment portion and the spiral saw through which dust moves into the attachment portion, the attachment portion having no openings therein which would allow air into the interior of the attachment portion during operation of the power tool other than the opening for the spiral saw, and wherein the forward edge of the attachment portion controls the depth of cut of the spiral saw and acts as a stop for the spiral saw when the forward edge of the attachment portion abuts the surface of the workpiece; and a dust exit member communicating with the interior of the first attachment portion, said dust exit member extending away from a side surface of the first attachment portion, wherein dust generated during use of the tool is substantially collected within the first attachment portion and then moved out from the interior thereof through the dust exit member by a vacuum device connectable to the dust exit member, such that dust can continue to collect within the attachment portion without affecting the operation of the tool.