Patent ID: 7533467

Claim:
A blade and cartridge for a utility knife comprising an elongated housing having a pair of blade compartments, one adjacent each housing end, a blade opening in each compartment through its adjacent end, for enabling a blade to be extended from each compartment, a pair of blade passageways in the housing joining the two compartments, one aligned with each opening for enabling blades in one compartment to be transferred directly from one compartment to the other, a plurality of blades each having top and bottom edges and upwardly converging side edges disposed in one or the other of the blade compartments, said bottom edges of the blades having operative cuffing portions at least at the ends thereof; a notch in each blade body open at the blade top edge and extending downwardly from the top edge for receiving a restrictor that limits movement of the blade in the cartridge; a pair of slots in each blade, one extending inwardly from and open to each of the side edges for receiving a lifter-pusher that enters one or the other of the slots through a blade side edge for simultaneously lifting and pushing the blade to an operative position extending partially out of the cartridge; and a central opening in each blade body for receiving a support for moving each blade to a retracted position within the cartridge.