Counter-rotating head electric razor

Claim 1

A ROTARY BLADE RAZOR COMPRISING A HOUSING A BLADE HAVING A GENERALLY CIRCULAR SHARPENED PERIPHERAL SLICING EDGE MOUNTED FOR ROTATION ON THE HOUSING AND WITH A MARGINAL PORTION OF THE AXIALLY OUTWARD SIDE OF THE BLADE ADJACENT THE SLICING EDGE EXPOSED EXTERIORLY OF THE HOUSING FOR SLIDING CONFORMING CONTACT WITH THE SKIN OF A USER DURING A SHAVING OPERATION, A BLADE BACK UP RING COMPRISING A HELICAL COIL OF WIRE FORMED INTO A RING MOUNTED CO-AXIALLY OF THE BLADE ON THE AXIALLY INWARD SIDE THEREOF A SURFACE FORMED ON EACH CONVOLUTION OF THE COIL, SUCH SURFACES DEFINING A COMMON ANNULAR SURFACE FACING A BLADE AND CONFORMING WITH AN AXIALLY INWARD, MARGINAL PORTION OF THE BLADE, EACH OF THE SURFACES FORMED ON THE CONVOLUTIONS OF THE COIL EXTENDING TRANSVERSELY ACROSS THE SLICING EDGE OF THE BLADE, MEANS LIGHTLY BIASING THE CONFORMING SURFACES OF THE COIL INTO CONFORMING ENGAGEMENT WITH A MARGINAL PORTION OF THE AXIALLY INWARD SIDE OF THE BLADE, ACROSS AND DRIVE MEANS FOR DRIVING THE BACK UP RING ROTATIVELY RELATIVE TO THE BLADE.