Portable power saw guide

Claim 1

A guide device intended for use as an accessory for a portable power circular saw to guide the saw squarely across a piece of lumber being cut in a cross cut manner, the guide device comprising, in combination: a square unit and a saw mounting plate unit reciprocally slidable longitudinally therealong; said square unit comprising: an elongated rectangularly shaped leg having a flat vertical interior surface, a flat vertical exterior surface, flat horizontally extending top and bottom edges, a front vertical end, and a back vertical end; a flat rectangularly shaped elongated guide member generally of a board shape and having a flat horizontally extending top surface, a flat horizontally extending bottom surface, opposed flat parallely extending side edges, and opposed front and back edges; fastening means affixing said back end edge of said guide member to said back end portion of said top edge of said leg with said guide member overlapping said leg and said guide member extending outwardly of the interior surface of said leg at a ninety degree engle thereto; a flat elongated rectangularly shaped lip forming member having a flat horizontal top surface, a flat horizontal bottom surface, transversely opposed longitudinally extending parallel side edges, and longitudinally spaced apart transversely extending front and back edges; fastening means affixing said lip forming member to said top edge of said leg extending longitudinally therealong with said lip forming bottom surface in juxtaposition with said leg top edge, the lip forming member extending outwardly over the interior surface of said leg member to overlap the same and form a horizontal lip therewith which extends at a ninety degree angle to the interior surface of the leg member; said plate unit comprising: a flat rectangularly shaped plate member having a flat smooth horizontal top surface, a flat horizontal bottom surface, opposed parallel side edges, and opposed parallel front and back edges; a pair of centrally spaced longitudinally spaced apart apertures extending through said plate member; a pair of mounting bolts, each bolt associated with one of said plate member apertures and adapted to pass therethrough for detachably securing said plate member to a base portion of the portable power circular saw with the side edges of the plate member extending parallel to the plane defined by the circular blade of the circular saw; a pair of transversely spaced apart longitudinally extending gib members each of an elongated rectangular shape with each extenDing along an opposite side edge of said plate member between opposite end edges thereof and in juxtaposition with the flat bottom surface thereof; the spacing between interior confronting side edges of said gib members being slightly greater than the width of said guide member of said square unit; the thickness of each of said gib members being identical to each other and being slightly greater than the thickness of said guide member of said square unit; a pair of flat elongated rectangularly shaped holding members each extending along a bottom surface of one of the gib members longitudinally of the plate member and overlapping the interior side edges of the gib members such that a pair of grooves having a generally U-shaped cross-sectional configuration are defined between the gib members, holding members, and bottom surface of the plate member; means disposed at spaced intervals along the side edges of the plate member and affixing the gib member and said holding member thereto; said plate unit being reciprocally slidable along said guide member of said square unit which is movably received in said plate unit grooves so that when said square unit guide member is positioned against an upper surface of the piece of lumber to be cut with said square unit leg positioned alongside said piece of lumber with said lip member resting on said upper side of said lumber and said leg interior surface engaging the adjacentmost edge of said piece of lumber then the saw secured to the edge unit is guided thereby in a manner normal to the longitudinal axis of the wood to provide an accurate cross-cut of the wood.