Carpet cutting machine

Claim 1

IN A RECIPROCALLY OPERATED PORTABLE ELECTRIC MACHINE, AN IMPROVEMENT FOR RAPIDLY CUTTING WITHOUT RAVELING TAUT SCRIM BACKED, RESILIENTLY EXTENSIBLE FIBER PILE CARPETING TO PROVIDE CUT SCRIM AND PILE EDGES FREE OF OSCILLATORY TEAR AND FIBER PULLING, SAID MACHINE COMPRISING AN ELECTRIC DRIVE MOTOR, FRAME, AND RECIPROCALLY DRIVEN OUTPUT MEMBER, SAID IMPROVEMENT COMPRISING IN COMBINATION A CUTTING BLADE DISPOSED TO DEPEND FROM SAID OUTPUT MEMBER AND BE ATTACHABLE THERETO, SAID BLADE BEING RECIPROCALLY DRIVEN THROUGH AT SUBSTANTIALLY AT LEAST ONE-HALF INCH OF LINEAR MOVEMENT AT SUBSTANTIALLY AT LEAST 300 STROKES PER MINUTE, AND BEING CONFIGURED WITH A SHARPENED EDGE FOREMOST WHEREIN SAID EDGE COMPRISES ALTERNATELY DISPOSED KNIFE SHARPENED INDENTATIONS, AND KNIFE SHARPENED SUBSTANTIALLY STRAIGHT EDGE SECTIONS, EACH SAID STRAIGHT EDGE SECTION BEING AT LEAST SUBSTANTIALLY AS GREAT IN DIMENSION ALONG SAID BLADE EDGE AS EACH SAID INDENTATION, AT LEAST A WORKING PORTION OF SAID BLADE EDGE BEING DISPOSED REARWARD AT A SLIGHT ANGLE WITH RESPECT TO THE DIRECTION OF RECIPROCATION, SAID PORTION OF SAID BLADE EDGE BEING COPLANAR AND NON-PARALLEL WITH SAID DIRECTION OF RECIPROCATION, A FIXED STANDARD FOR RECEIVING GOODS TO BE CUT CONFIGURED WITH A DEPENDING POST PORTION HAVING RELATIVELY NARROW DIMENSION TRANSVERSE TO THE DIRECTION OF TRAVEL THROUGH GOODS TO BE CUT AND DISPOSED IN REARWARD ALIGNMENT WITH SAID BLADE, AND WITH A FOOT PORTION INCORPORATING A SPACER EMBODIMENT AT LEAST FORWARDLY EXTENDING FROM SAID POST PORTION, SAID STANDARD HAVING AN OPENING EXTENDING THEREINTO AND CONFIGURED TO RECEIVE SAID BLADE IN ALL POSITIONS OF BLADE MOVEMENT, SAID SPACER EMBODIMENT COMPRISING LOW FRICTIONAL COEFFICIENT MEANS FOR PASSING ALONG FLOOR AND WALL SURFACES WITH THE PROJECTED DISTANCE BETWEEN THE TOP AND BOTTOM OF SAID FOOT PORTION AND SPACER EMBODIMENT BEING GREATER THAN THE PROJECTED DISTANCE BETWEEN NEXT ADJACENT INDENTATIONS IN SAID BLADE EDGE, THEREBY OPERABLY ENABLING SAID MACHINE TO BE PASSED ALONG FLOOR SURFACES DURING OPERATION.