A utility knife has a housing having a longitudinally open front end, a blade assembly including a blade and movable in the housing between a front end position and a rear end safety position, and a lever pivoted on the housing. Two links each have one end pivoted on the blade assembly and an opposite end pivotal on the lever so as to pivotally interconnect the blade assembly and the lever for relative movement of the blade assembly and the housing between the rear end safety position with the blade inside the housing and the front end position with the blade projecting longitudinally forward from the front end of the housing. A spring is connected to the links urges the blade assembly into the rear end safety position.

A cutting device has a selectively replaceable and reorientable blade. The cutting device includes 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 and reorientable in the carriage and a cover member that is removably attachable to the housing. Further, the cutting device includes an adjustable blade depth assembly providing the ability to direct and/or pre-select the depth or length a blade disposed in the carriage will reach upon engagement of a dial component and/or switch member operably connected to the blade carriage.

A knife that can be quickly assembled and disassembled comprises a blade and a handle that are removably connected to each other through a connection assembly, and further comprises a knife clip, a knife disc and a handle ring. The left end of the blade is provided with a knife rod. A step is provided at the connection between a main body of the blade and the knife rod. A knife clip is sleeved outside of the step. The handle ring and the knife disc are provided parallel on the left and right sides respectively, and are respectively sleeved outside of the knife rod. The handle comprises a handle sleeve and a built-in sleeve that is fixed at the right end of the inner hole of the handle sleeve.

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.

One or more embodiments of a device/knife for with a replaceable blade. The device may include a handle and a blade. The handle may include a grip, a pivot pin, and a latch. The pivot pin may have a first shape in a first plane. The blade may include an edged portion, a connection portion, and a tang. The connection portion may define an opening where the pivot pin is capable of entering into or exiting out of the opening of the connection portion if the pivot pin has a first orientation relative to the connection portion and the pivot pin is not capable of exiting out of the opening of the connection portion if the pivot pin has a second orientation. The latch may be configured to secure the tang of the blade when the pivot pin has the second orientation relative to the connection portion.

One or more embodiments of a device/knife for with a replaceable blade. The device may include a handle and a blade. The handle may include a grip, a pivot pin, and a latch. The pivot pin may have a first shape in a first plane. The blade may include an edged portion, a connection portion, and a tang. The connection portion may define an opening where the pivot pin is capable of entering into or exiting out of the opening of the connection portion if the pivot pin has a first orientation relative to the connection portion and the pivot pin is not capable of exiting out of the opening of the connection portion if the pivot pin has a second orientation. The latch may be configured to secure the tang of the blade when the pivot pin has the second orientation relative to the connection portion.

A system may include a blade die, a first clamping caul positioned on a first side of the blade die, and a second clamping caul positioned on a second side of the blade die. A molding surface of the blade die and a molding surface of the first clamping caul may be configured to bend a first interchangeable blade positioned therebetween into a first shape in response to a first compression force. A second molding surface of the blade die and a molding surface of the second clamping caul may be configured to bend a second interchangeable blade positioned therebetween into a second shape in response to a second compression force.

A knife includes a handle, a neck configured to hold a blade, and a lever configured to selectively release the blade from the neck. The lever is coupled to a blade lock arm configured to extend along a side of the blade. A ramped surface pushes the blade lock arm into the blade to press the blade against a side of the neck to clamp the blade to the side of the neck when the blade lock arm is in a blade locked position.

A knife includes a handle, a neck configured to hold a blade, and a lever configured to selectively release the blade from the neck. The lever is coupled to a blade lock arm configured to extend along a side of the blade. A ramped surface pushes the blade lock arm into the blade to press the blade against a side of the neck to clamp the blade to the side of the neck when the blade lock arm is in a blade locked position.

A box cutter includes a blade, a handle, a sheath and a restraining element. The handle includes a space for receiving a rear portion of the blade, a chamber in communication with the space, a rear slot in communication with the space, and a front slot in communication with the chamber. The sheath is movable in the chamber and covers a front portion of the blade. The restraining element is movable in the handle between a locking position and an unlocking position. In the locking position, the restraining element abuts against the sheath to prevent the sheath from retreating into the handle to keep on covering the front portion of the blade. In the unlocking position, the restraining element is moved from the sheath to allow the sheath to retreat into the handle to allow the front portion of the blade to extend from the sheath.