Importance

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Abstract

A blade unit for cutting sheet material including a base member assembly mounting a circular blade and a cover member for detachable engagement with the base member assembly. The base member assembly includes a supporting wall having a circular upper edge and a guard flange extending around the circular upper edge and protecting a portion of an outer edge of the blade from contact. The base member assembly is further provided with a straight bottom edge and a portion of the blade extends below the bottom edge to define an exposed cutting edge for the blade. An elongated guide structure tab extends from the bottom edge parallel to and adjacent the exposed portion of the blade for guiding the blade unit along a slot in a guide template. The cover member is positionable in engagement with the base member assembly in a first, use position wherein a cavity of the cover member receives a portion of the base member assembly with the exposed portion of the blade located extending away from the cavity of the cover member. In a second position of the cover member relative to the base member assembly, the exposed portion of the blade is located within the cavity of the cover member to provide a protective cover over the exposed portion of the blade.

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First Claim