Saw dust blower for portable power-driven saw

Claim 1

IN A PORTABLE POWER-DRIVEN SAW OF THE TYPE HAVING A SHOE PLATE BY MEANS OF A WORKPIECE, A BLADE EXTENDING ON THE TOP SURFACE OF A WORKPIECE, A BLADE EXTENDING STHROUGH THE SHOE PLATE TO ENGAGE THE WORK, A HOUSING WITH A MOTOR TO DRIVE THE BLADE, MEANS TO RAISE AND LOWER THE HOUSING WITH RESPECT TO THE SHOE PLATE FOR SELECTIVE DEPTHS-OF-CUT OF THE BLADE, A BLADE GUARD PIVOTABLE MOUNTED ON THE HOUSING, AND MEANS TO PIVOT THE GUARD ON THE HOUSING IN ACCORDANCE WITH THE SELECTIVE RAISING AND LOWERING MOVEMENTS OF THE HOUSING WITH RESPECT TO THE SHOE PLATE, THE IMPROVEMENT WHICH COMPRISES: (A) AIR DISCHARGE MEANS INCLUDING AN APERTURE FORMED IN THE HOUSING: (B) A FIRST ARCUATE FLANGE MOUNTED ON THE HOUSING AROUND SAID APERTURE; (C) A SECOND ARCUATE FLANGE CARRIED BY THE GUARD; (D) SAID FLANGES TELESCOPING WITH RESPECT TO ONE ANOTHER, THEREBY FORMING AN AIR CONDUIT WHICH IS IN COMMUNICATION WITH SAID APERTURE FORMED IN THE HOUSING; (E) SAID SECOND FLANGE AND THE HOUSING HAVING AN AIR DISCHARGE OPENING THEREBETWEEN, WHEREBY A STREAM OF AIR IS DIRECTED TO THE APPROXIMATE POINT WHERE THE CUTTING EDGE OF THE BLADE LEAVES THE WORK FOR BLOWING THE SAW DUST AWAY FROM THE VICINTIY OF THE SUCCEEDING PORTION OF THE LINE-OF-CUT ON THE WORK SURFACE; AND (F) WHEREBY AS THE HOUSING IS RAISED OF LOWERED WITH RESPECT TO THE SHOE PLATE, THE GUARD PIVOTS ON THE HOUSING, THEREBY AUTOMATICALLY CHANGING THE POSITION OF SAID AIR DISCHARGE OPENING WITH RESPECT TO THE SHOE PLATE, AND THEREBY PROVIDING FOR THE AIR STREAM TO BE DIRECTED AT ALL TIMES TO THE PROXIMITY OF THE SAID LINE-OF CUT REGARDLESS OF THE PARTICULAR DEPTH-OF-CUT PORTIONS OF THE BLADES.