A cutting device includes cutting device includes a housing including an aperture, and a blade cartridge removably coupled to the housing through the aperture. The blade cartridge is configured to hold a plurality of blades. The cutting device further includes a cartridge ejector configured to eject the blade cartridge from the housing.

A cutting device is disclosed. The cutting device has a first housing member, a second housing member that is removably attachable to the first housing member to form a housing, and a carriage that is movably disposed in the housing, the carriage including a first attachment portion, which is disposed at a first portion of the carriage, and a second attachment portion, which is disposed at a second portion of the carriage that is disposed away from the first portion of the carriage. The cutting device also has an exterior member disposed at an exterior of the housing and attached to the carriage via an aperture disposed in one of the first housing member and the second housing member, and a cutting member that is removably attachable to the first attachment portion at the first portion of the carriage.

A knife has two housing parts as well as a blade and a blade support. The support has a blade seat having a contact face normally engaging a blade face with the opposite blade face being freely accessible. The parts are movable between an operating position with the blade projecting and a stowed position with the blade wholly contained. A holder on the blade support secures the blade in the seat via interlocking formations that hold the blade against the contact face but that are so constructed that the blade has a degree of freedom in at least one direction in order to be detached from the blade seat. A latch on the holder has a bolt movable between a bolted position detachably fitted in the seat and holding the blade there and a released position out of the seat and allowing the blade to be replaced.

A device is disclosed including a reloadable utility knife having a blade magazine with one or more compartments for storing multiple cutting blades. The blade magazine has a reloading compartment for new blades, and a storage compartment to keep additional blades. The blade magazine is loaded from the rear of the knife body and is locked inside. A working blade may be released before reloaded a fresh blade. The working blade can be extended or retracted multiple times via a blade transport mechanism. The blade magazine may be extracted via the lock mechanism and pushed out by a spring designed for this purpose. The blade transport mechanism, the blade release mechanism, and a blade lock mechanism work in cooperation to allow extension and retraction of a blade, disposing of a blade, and reloading of a blade.

A retractable utility knife includes a blade carrier having a control pin and a frame liner having a control track, the carrier moveable between a retracted configuration, and deployed configuration, and a removal/replacement configuration, the control pin retaining the blade to the carrier in the retracted configuration and deployed configuration, and the control track being arranged so that the control pin releases the blade from the carrier when in the removal/replacement configuration.

A utility knife is provided, including: a housing, including first and second compartments; a blade holder, movably received within the first compartment; a blade storing carrier, detachably inserted in the second compartment, including a receiving portion for receiving at least one spare blade; an elastic unit, disposed between the housing and the blade storing carrier; and a locking mechanism, including a base body disposed to the housing, a movable member attached to the base body and movable between locking and release positions, a first engaging member disposed on the movable member and a second engaging member disposed on the receiving portion and releasably engagable with the first engaging member, when the is second engaging member is disengaged from the second engaging member, the elastic unit biases the receiving portion to eject the blade storing carrier.

A box top opener employs a trapezoidal ceramic blade having a cutting edge which is positionable at multiple positions. A knob is rotatable to extend and retract the blade. A guide projects from a front of the cutter body to provide a guide surface engageable against the top of a box. In one embodiment, a blade carrier has a follower which traverses a spiral track for displacing the blade.

An automatically retractable knife that includes an actuator, a blade carrier, two springs, a pawl and a blade. The knife is configured with a safety feature to ensure that the knife blade is automatically retractable upon completion of cutting a surface.

A safety knife functions as both a box cutter and a separate line cutter. A slidable grip is manually displaceable between two stable safety positions. In one safety position, the grip obstructs access to a forwardly projecting blade. In a second safety position, the grip obstructs access to the line cutter.

A finger-push safety knife, including a knife housing, a knife holder, a blade, and a shifter. The blade is installed onto the knife holder. The knife holder is disposed in a cavity of the knife housing. A restricting groove is disposed on the knife holder. A gear adjustment slot is disposed on the knife housing. When the shifter rotates to the blade ejection gear, the shifter fits with the restricting groove to enable the knife holder to move and move to a preset position in the cavity, and the shifter is clamped at a blade ejection position in the restricting groove, so that the displacement of the knife holder can be restricted and the knife holder can be fastened at the preset position in the cavity under the action of an external force, to restrict an extension length of the blade from the knife housing.