Abstract: A utility knife has a housing in which a particle flow cross section is substantially constant or increases in a flow direction of particles from an inlet of the housing into an interior of the housing at an end of the housing to an outlet of the housing. A blade assembly has a blade with a cutting edge and is movable relative to the housing between a stowed position and an operating position for a cutting operation. A first actuating part and a second actuating part mounted movable relative to the first actuating part move of the blade assembly between the stowed and operating positions. First and second slotted links form a four-point linkage with the first and second actuating parts.

Abstract: 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.

Abstract: A utility knife has a housing, a blade holder movable between a front position and a rear position in the housing, and first and second return formations of which one is mounted on the housing and the other on the blade holder. The first and second return formations urge the blade holder into the rear position relative to the housing in at least one region of movement of the blade holder. The first return formation includes a spring and a movable element connected to the spring and urged thereby in a travel direction of the movable element. The second return formation includes a counter surface engageable with the movable element.

Abstract: 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.

Abstract: A knife has a first part and a second part movably engaged to the first part along a path between an open position in which a housing interior is accessible and a closed position. A holding surface is fixed on and jointly slidable with the second part, and a third part is fixable on the first part, An actuator is movable on the second part between an actuated position and an unactuated position. An arm integral with or fixed on the third part is operatively engaged by the actuator and displaced on movement of the actuator between the unactuated position and the actuated position between a locking position securing the second part in one of the open and closed positions and a release position.

Abstract: 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.

Abstract: A knife has a housing, a blade having a cutting edge and mounted on the housing with the edge extending transversely of a predetermined direction. An actuator is movable on the housing and pivots a blade guard on the housing about a guard axis for movement in the predetermined direction from a safety position in which the blade guard covers the cutting edge of the blade into a cutting position in which the blade guard is spaced from the cutting edge and the cutting edge is freely accessible and from the cutting position in a direction opposite the predetermined position into the safety position.

Abstract: A knife having a housing (11) and a blade support (18) for holding a blade (19), the blade support being movable between a retracted position in which the blade support (18) is moved by a reset device (22) against a stop of the housing (11), and a fully advanced position, the blade support having a base (23) and a blade cover (24) movable between a closed position and an open position relative to the base (23), and in the closed position, the base (23) and the blade cover (24) firmly secure the blade (19) in a blade seat (41) between the base (23) and the blade cover (24) and in the open position, the base (23) and the blade cover (24) are so oriented relative to each other that a blade can be changed.

Abstract: A knife with automatic blade retraction including a housing, a moveable actuating device, a rotatable blade unit, and a retraction element which always applies a retraction force to the blade unit in the direction of the retracted position. The rotatable blade unit can be brought into engagement with the actuating device and is moveable by means of the actuating device from a position retracted in the housing into a position extended from the housing. The blade unit is also rotatable by the action of a cutting force in an extended position from an engagement position in which the blade unit is in engagement with the actuating device into a release position in which the blade unit is not in engagement with the actuating device.

Abstract: A knife has a casing, a blade, and a blade support carrying the blade and movable in the casing between a rear safety position in which the blade is recessed in the casing, a cutting position in which the blade projects forward out of the casing, and a blade-change position forward of the cutting position and in which the blade projects out of the casing to a greater extent than in the cutting position. An actuator can move the blade support, and a latch is slidable into and out of a blocking position fixing the blade support in the blade-change position in a releasable manner.

Abstract: A knife has a body forming a cavity, a blade with a cutting edge, and a holder forming a tool seat and movable relative to the knife body between an operating position with the tool seat in the cavity and a change position with the tool seat outside the cavity. An additional tool has at least two working parts and is provided with a holding part that can be fitted to the tool seat such that, in the operating position of the holder, one of the working parts is in a working position in which it projects from the body and can be used by a user while the other working part is in a stowed position inaccessible in the cavity and, in the change position, the tool is entirely outside the body and can be separated from the seat.

Abstract: A utility knife has a housing, a blade, and a blade support carrying the blade and supported on the housing so as to be displaceable in a straight line with the blade between a safety position, a cutting position, and a blade-change position. A torsion spring biases the blade into the safety position.

Abstract: The invention relates to a knife with a housing (11) and with a blade holder (13) for holding a blade (17), the blade holder (13) being movable between a safety position in which the blade (17) is inaccessible within the housing (11) and a cutting position in which the blade (17) projects at least partially out of the housing (11), the cutting position being defined by the interaction of at least one stop surface (32a, 32b) associated with the housing (11) and at least one counterpart surface (23a, 23b) associated with the blade holder (13).

Abstract: A knife (1) with automatic blade retraction including a housing (2), a moveable actuating device (4), a rotatable blade unit (30), and a retraction element (34) which always applies a retraction force to the blade unit (30) in the direction of the retracted position. The rotatable blade unit (30) can be brought into engagement with the actuating device (4) and is moveable by means of the actuating device (4) from a position retracted in the housing (2) into a position extended from the housing (2). The blade unit (30) is also rotatable by the action of a cutting force in an extended position from an engagement position in which the blade unit (30) is in engagement with the actuating device (4) into a release position in which the blade unit (30) is not in engagement with the actuating device (4).