EMPLOYEE WAS STARTING THE PIPE CUTTER WITH HIS LEFT HAND HOLDING DOWN THE LOCKING HANDLE. WHEN PRESSURE WAS APPLIED TO PIPE THE HANDLE KICKED UPPUSHING THE HANDLE UP. BACK OF EMPLOYEE'S HAND S TRUCK SHARP EDGE OF ANGLE IRON MOUNTED ABOVE CUTTER. BACK OF HAND RECEIVED PUNCTURE WOUND, REQUIRING 5 SUTURES.