A utility knife with a locknut includes a case, a blade holder, a blade, a movable pushbutton and a locking device. A blade extension/retraction opening is formed at a front end of the case and provided for the blade to extend or retract, and a movable chute is formed on a side of the case and provided for the movable pushbutton to move. The blade is correspondingly installed in the case by the blade holder, the blade controls its extension and retraction in the blade extension/retraction opening by the movable pushbutton. The locking device includes a locking rod and an adjusting device and uses the adjusting device to adjust the locking rod and lock the blade.

Contemplated cutting systems are provided that include a blade, a blade holder, and a non-cutting surface. The non-cutting surface is configured to contact a surface to be cut. As the cutting system is moved across the surface and the non-cutting surface is rotated against the surface, the blade is configured to (i) pierce the surface with a first piercing edge and (ii) cut the surface with a first cutting edge. Contemplated cutting systems can be incorporated into hand or machine operated cutting tools.

A cutting device is disclosed. The cutting device has a housing and a carriage that is movably disposed in the housing, the carriage being movable between a retracted position and an extended position. The cutting device also has a cutting member that is removably disposable in the carriage and a cover member that is removably attachable to the housing. The housing has a locking member. When the carriage is in the extended position and the cover member is attached to the housing, the locking member locks the cover member to the housing. When the cutting member is disposed in the carriage in the extended position, the cutting member is retained in the housing by the locked cover member.

Quick-change utility knives can be rapidly opened, often without tools, such that the blade of the knives can be rapidly and readily changed. The knife can be achieved with a variety of body materials and sizes, and can be applied to both fixed and retractable knives equally. The knife separates into body portions that are secured together at the blade end by a physical structure. The opposite end of the body portions are secured together by a magnetic force. When the blade is to be changed, a separation force between the body portions overcomes the magnetic force, the body is opened, and the blade rapidly changed.

A knife includes a handle body defining an interior blade-slide cavity housing a blade slide carrying a blade with a cutting edge. The blade slide is reciprocated within the blade-slide cavity between a blade-storage position in which the cutting edge is housed within the handle body and at least two blade-protruding positions in which the cutting edge protrudes to the exterior of the handle body, through a forward-end opening, to disparate extents. Blade-slide reciprocation is facilitated by a blade-slide actuator that includes a button reciprocable along an actuator slot defined through the handle body. A handle-body undulated surface defined along the handle body in the vicinity of the actuator slot is configured for selective mechanical interference with a button undulated surface in order to define the at least two blade-protruding positions. A blade-protruding position is temporarily maintained through a user's depression of the button to maintain the selective interference.

The invention relates, inter alia, to a knife with a housing comprising a first housing part (12) and a second housing part (13) and also a blade carrier (20), in which a blade (15) is retained, wherein the first housing part (12), in particular for a blade changeover, can be released from the second housing part (13) and fastened thereon again, wherein the blade carrier (20) is mounted in the housing (11) such that it can be moved between a basic position and a cutting position. The special feature is that the blade carrier (20) is connected to the second housing part (13) in a non-releasable manner, and that the blade carrier (20) and the second housing part (13) form a preassemblable structural unit which can be fastened on the first housing part (12) in a releasable manner.

A cutting device is disclosed. The cutting device has a housing, a cutting assembly that is movably disposed in the housing, the cutting assembly including a body member, an actuating member, and a first urging member that is configured to urge the actuating member away from the body member, from an inner position toward an outer position relative to the body member, by applying a first urging force, and a second urging member that is configured to urge the cutting assembly to retract within the housing by applying a second urging force that urges the actuating member to move from an extended position toward a retracted position relative to the housing. The housing includes at least one recess.

A box cutter includes a handle, a holder and a linkage. The handle includes a front slot in communication with a space. The holder is formed with a boss and operable for holding a portion of a blade. The linkage includes a sliding element formed with a pusher. The linkage is operable to move the sliding element toward the holder to abut the pusher against the boss to move the holder toward the front slot to extend a pointed end of the blade from the space through the front slot when the boss is located between the front slot and the pusher. The pusher is biased from the boss to allow the holder to return to its original position when the pusher is located between the front slot and the boss.

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 tool includes a housing comprising first and second sides, and a slidable blade assembly configured to move between first, second, third positions. The blade assembly selectively receives a removable blade such that the blade is stored within the housing when the assembly is in the first position, a portion of the blade extends outwardly from the housing when the assembly is in the second position, and the blade is completely outside of the housing, and exposed for removal of the blade from the assembly without removing or separating any portion of the first side or the second side of the housing, when the assembly is in the third position. The tool further includes a first button associated with moving the slidable blade assembly between the first and second position, and a second button associated with moving the slidable blade assembly between the second and third position.