Patent ID: 7520059

Claim:
A knife comprising: a handle having an aperture therein; a blade holder slidingly carried by the handle for sliding movement relative to the handle between an extended position and a retracted position; and a utility blade replaceably attached to the blade holder for selective removal and replacement of the utility blade, the utility blade having first and second parallel linear edges, a mounting notch formed in the first linear edge, and a cutting edge, wherein a portion of the blade holder engages the mounting notch and locks the utility blade to the blade holder, the utility blade extending out of the aperture when the blade holder is in the extended position, the utility blade not extending out of the aperture when the blade holder is in the retracted position, wherein the extended position is an operative position in which the blade is locked to the blade holder and the cutting edge is partially exposed for use in cutting, and wherein the aperture and blade holder ensure that the utility blade remains spaced from a perimeter of the aperture by at least 1 mm as the blade holder slides from the extended to the retracted position and when the blade holder is in the extended position.