Abstract: A knife has a blade that can be contained within a housing when not in use and extended outside the housing when used. Additional blades can be stored within the housing, and when desired, loaded onto a blade seat. A trigger actuator moves a blade seat carrying a blade between extended and retracted positions. The blade seat may be locked into a number of different positions.

Abstract: An artistic knife with spare blades, including a main body in which a blade seat is back and forth slidably disposed. The main body is formed with a receptacle corresponding to the blade seat for receiving multiple spare blades. Each blade has more than one engaging notch. The blade seat is provided with a transversely movable engaging block corresponding to the engaging notch of the blade for inserting therein. When the blade seat is slided forward, the blade is driven to extend out of the main body. The main body has a guide rail corresponding to the engaging block. By means of the guiding and restriction of the guide rail, in the travel of the blade pushed out by the blade seat, the engaging block is inserted into the engaging notches of the blade deeper and deeper. In returning travel, the depth by which the engaging block is inserted in the engaging notch is gradually reduced until it is slightly smaller than the thickness of the blade. Therefore, the engaging block can be truly engaged with the blade.

Abstract: A knife has a blade that can be contained within a housing when not in use and extended outside the housing when used. Additional blades can be stored within the housing, and when desired, loaded onto a blade seat. A trigger actuator moves a blade seat carrying a blade between extended and retracted positions. The blade seat may be locked into a number of different positions.

Abstract: An artistic knife with spare blades, including a main body in which a blade seat is back and forth slidably disposed. The main body is formed with a receptacle corresponding to the blade seat for receiving multiple spare blades. Each blade has more than one engaging notch. The blade seat is provided with a transversely movable engaging block corresponding to the engaging notch of the blade for inserting therein. When the blade seat is slided forward, the blade is driven to extend out of the main body. The main body has a guide rail corresponding to the engaging block. By means of the guiding and restriction of the guide rail, in the travel of the blade pushed out by the blade seat, the engaging block is inserted into the engaging notches of the blade deeper and deeper. In returning travel, the depth by which the engaging block is inserted in the engaging notch is gradually reduced until it is slightly smaller than the thickness of the blade. Therefore, the engaging block can be truly engaged with the blade.