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A knife has a housing, a blade carrier supported in the housing and adapted to hold a blade, and an actuating element coupled to the blade carrier. A handle can move between a nonactuated position and an actuated position and is coupled to the actuating element such that on movement from the nonactu

A knife has a housing, a blade carrier supported in the housing and adapted to hold a blade, and an actuating element coupled to the blade carrier. A handle can move between a nonactuated position and an actuated position and is coupled to the actuating element such that on movement from the nonactuated position to the actuated position the actuating element displaces the blade carrier from a safety position in which blade mounted on the blade carrier is retracted into a seat of the housing in a first cutting position in which the blade projects out of the housing. A pivot joint connects the actuating element with the blade carrier. A guide supports the blade carrier in a translatory and a rotatable manner on the housing.

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1. A knife comprising: a housing;a blade carrier supported within the housing and adapted to hold a blade and movable between a safety position in which the blade mounted on the blade carrier is retracted into the housing, a first cutting position in which the blade projects out of the housing, and

1. A knife comprising: a housing;a blade carrier supported within the housing and adapted to hold a blade and movable between a safety position in which the blade mounted on the blade carrier is retracted into the housing, a first cutting position in which the blade projects out of the housing, and a second cutting position offset from the first position and from the safety position;an actuating element;a pivot joint connecting the actuating element to the blade carrier;a handle coupled to the actuating element and movable therewith between a nonactuated position and an actuated position such that on movement from the nonactuated position to the actuated position the actuating element displaces the blade carrier from the safety position into the first cutting position; anda support element engageable between the housing and the actuating element and bracing the actuating element against the housing on movement of the handle from the nonactuated position to the actuated position and forcing the blade carrier to move into the first cutting position, movement of the blade into the second cutting position disengaging the support element from between the actuating element and the housing and permitting the blade carrier to move from the second cutting position into the safety position with the handle in the actuated position. 2. The knife of claim 1, wherein the actuating element is formed as a lever and is pivotal on the handle. 3. The knife of claim 1, further comprising a spring urging the blade carrier into the safety position. 4. The knife of claim 1, wherein the handle is a lever pivotal on the housing between the nonactuated position and the actuated position. 5. The knife of claim 1, further comprising: a spring biasing the handle into the nonactuated position. 6. The knife of claim 1, further comprising: an abutment fixed to the housing and against which the support element is braceable. 7. The knife of claim 1, wherein the support element is detachably braced against the housing or the actuating member. 8. The knife of claim 7, wherein the support element is braceable against the housing or the actuating element only by applying pressure to the handle. 9. The knife of claim 1, wherein the support element is pivotal on the actuating element. 10. The knife of claim 1, wherein the housing is formed with a notch in which the support element is detachably engageable. 11. The knife of claim 1, further comprising: at least one guide face formed adjacent the notch and guiding the support element into engagement with the notch 12. A knife comprising: a housing;a blade carrier supported within the housing and adapted to hold a blade and movable between a safety position in which the blade mounted on the blade carrier is retracted into the housing, a first cutting position in which the blade projects out of the housing, and a second cutting position offset from the first position;an actuating element coupled to the blade carrier;a pivot joint connecting the actuating element to the blade carrier;a handle movable between a nonactuated position and an actuated position and coupled to the actuating element such that on movement from the nonactuated position to the actuated position the actuating element displaces the blade carrier from the safety position into the first cutting position;guide means for supporting the blade carrier in a translatory and a rotatable manner on the housing; anda support element mounted on the actuating element or the housing so as to brace the actuating element against the housing and prevent the blade carrier from moving into the safety position when the blade carrier is moved from the safety position into the first cutting position and to disengage the actuating element from the housing and permit movement of the blade carrier into the safety position when the blade carrier is moved from the first cutting position into the second cutting position. 13. The knife of claim 12, wherein the actuating element is formed as a lever and is rotatable on the handle. 14. The knife of claim 12, wherein the handle is a lever pivotal on the housing between the nonactuated position and the actuated position. 15. The knife of claim 12, further comprising: a spring biasing the handle into the nonactuated position. 16. The knife of claim 12, further comprising: an abutment fixed to the housing and against which the support element is braceable. 17. The knife of claim 12, wherein the support element is detachably braced against the housing or the actuating member. 18. The knife of claim 12, wherein the support element is braceable against the housing or the actuating element only by applying pressure to the handle. 19. The knife of claim 12, wherein the support element is pivotal on the actuating element. 20. The knife of claim 12, wherein the housing or the actuating element is formed with a notch in which the support element is detachably engageable, the knife further comprising: at least one guide face formed adjacent the notch and guiding the support element into engagement with the notch.