Depth calibration means for portable power-driven saw

Claim 1

IN A PORTABLE POWER-DRIVEN SAW OF THE TYPE HAVING A SHOE PLATE BY MEANS OF WHICH THE UNIT IS SUPPORTED ON A WORKPIECE, A BLADE EXTENDING BEYOND THE SHOE PLATE TO ENGAGE THE WORK, A HOUSING ON THE SHOE PLATE WITH A MOTOR TO DRIVE THE BLADE, ADJUSTABLE MEANS TO RAISE OR LOWER THE BLADE WITH RESPECT TO THE SHOE PLATE FOR SELECTIVE DEPTHS OF CUT, A CONTROL HANDLE ON THE HOUSING, AND A BLADE GUARD LATERALLY OF THE HANDLE, THE GUARD AND HOUSING BEING ROTATABLE RELATIVE TO ONE ANOTHER AS THE DEPTH OF CUT IS ADJUSTED, A DEPTH CALIBRATION MEANS, COMPRISING: (A) A SCALE AND A COOPERATING INDICATION MEANS, ONE ON THE GUARD AND THE OTHER ON THE HOUSING, WHEREBY A RELATIVE MOVEMENT IS OBTAINED BETWEEN SAID SCALE AND SAID INDICATION MEANS WHENEVER THE DEPTH OF CUT IS ADJUSTED; (B) SAID SCALE AND INDICATION MEANS BEING MOUNTED BETWEEN SAID HANDLE AND GUARD AND BEING READILY VISIBLE TO THE OPERATOR IN HIS NORMAL POSITION LOOKING DOWN ON THE UNIT; AND (C) SAID INDICATION MEANS BEING ADJUSTABLY MOUNTED, WHEREBY THE ACCURACY MAY BE MAINTAINED WHENEVER THE BLADE IS SHARPENED TO A REDUCED DIAMETER.