Patent ID: 7971611
Filing Date: 2011-07-05
Classification: B23Q,B27C

Abstract:
1. A combination router support plate and dust extractor comprising: a flat, generally rectangular center layer, wherein the center layer has a pear-shaped aperture disposed through the center layer, the pear-shaped aperture further comprising: a flat, generally rectangular second layer disposed adjacent one side face of the center layer to follow the contour thereof, the second layer further comprising: a flat, generally rectangular third layer disposed adjacent the opposite side face of the center layer to follow the contour thereof, the third layer further comprising: the plurality of layers being machinable to permit mounting of a conventional woodworking router with a plurality of threaded fasteners to the exterior face of the third layer; the third layer further permitting engagement to the exterior face of a connectable hose of a vacuum source, said engagement being concentric with the circular aperture disposed through the third layer concentric with the small circle partially formed by the circular arc described by the small end of the pear-shaped aperture of the center layer; wherein a circular channel is disposed through the plurality of layers, the circular channel comprising the centrally disposed circular aperture of the second layer, concentric with the large circle partially formed by the circular arc described by the large end of the pear-shaped aperture of the center layer, and concentric with the centrally disposed circular aperture of the third layer, the circular channel sized to permit a router spindle and collet to pass through; and wherein the plurality of layers has a closed internal chamber described by the pear-shaped aperture disposed through the center layer, the interior face of the second layer, and the interior face of the third layer, the closed internal chamber having an inlet at one edge of the circular channel disposed through the plurality of layers, and the closed internal chamber having an exhaust duct disposed through the exterior face of the third layer near a corner of the third layer, the exhaust duct comprising the circular aperture disposed through the third layer near a corner of the third layer.