An improved utility razor safety knife is disclosed. The knife hood is normally in the closed position where the blade is protected. The hood may be locked in the closed position by a sliding hood lock. The hood pivots into the open position, exposing the razor blade, when the knife is in use. The hood...http://www.google.com.au/patents/US5241750?utm_source=gb-gplus-sharePatent US5241750 - Utility razor safety knife
