Shop tool attachment

A low cost shop tool attachment for a drill press comprising:

• an elongated rigid plastic housing having an upper panel and a lower panel with the upper panel having a first set of integral plain bearings and the lower panel having a second set of integral plain hearings with the first set of integral plain bearings in axial alignment with the second set of integral plain bearings;
• a polymer plastic drive gear rotationally supported between said upper panel and said lower panel;
• a plurality of polymer plastic driven gears with each of said driven gears having an upper plain bearing engaging one of the integral plain bearings in the upper panel and a lower plain bearing engaging one of the integral plain bearing in the lower panel for axially and rotationally supporting each of said driven gears between said lower panel and said upper panel, each of said driven gears in driving engagement with an adjacent driven gear;
• a hollow hub having a first end secured to said elongated housing and a free end for removable attachment to a stand alone shop tool whereby the hub fixedly supports the elongated housing;
• a driveshaft axle in engagement with said drive gear with said driveshaft axle extending axially outward from said hub, whereby rotation of said driveshaft axle from an external power source rotates the drive gear;
• a plurality of drill bits with one of the plurality of drill bits axially secured to said drive gear and the remaining of the plurality of drill bits secured to said plurality of driven gears so that rotation of the drive gear rotates the plurality of drill bits to thereby simultaneously form a set of aligned holes in a workpiece;
• and
• a two stage mechanical fuse for interrupting power to the drive gear if a drill bit encounters undue resistance with the two stage mechanical fuse comprising a shear pin (15a) extending through the driveshaft axle and an axle on the drive gear with the axle on the drive gear having a set of ears (17a, 18b) for engagement with the shear pin with either the shear pin or the ears yielding in response to undue resistance on a drill bit to limit damage to the shop tool attachment to replacement of the shear pin or the drive gear.