Abstract: The present invention relates to an improved blade-switchable utility knife. The utility knife comprises a housing, a blade slider, a slide actuator, a switch actuator, and a pair of blades. By switching the switch actuator, a corresponding blade is pushed and pressed by either a first auxiliary reacting portion or a second auxiliary reacting portion to remain in an operative position thereof, and is moved together with the blade slider. Accordingly, the present invention has advantages and effects of quick switch of blades for use and convenient carrying, etc.

Abstract: The present invention relates to an improved blade-switchable utility knife. The utility knife comprises a housing, a blade slider, a slide actuator, a switch actuator, and a pair of blades. By switching the switch actuator, a corresponding blade is pushed and pressed by either a first auxiliary reacting portion or a second auxiliary reacting portion to remain in an operative position thereof, and is moved together with the blade slider. Accordingly, the present invention has advantages and effects of quick switch of blades for use and convenient carrying, etc.

Abstract: A safe utility knife is provided having a housing, a blade sliding seat, a pushing force generator, an acceleration detector, a stopper, a stopper pushing portion, and a sliding switch. When activated with a blade protruding out, and an acceleration due to a sudden dropping movement occurs, the acceleration detector moves from a low acceleration position to a high acceleration position. It also presses down the sliding switch and the stopper so that the stopper moves from a locking position to a non-locking position. The blade sliding seat is pulled by the pulling force generator to a blade storing position to protect against accidental injury. The knife can be operated by one hand and is suitable for regular blades available on the market. In addition, it can be switched to manual automatic blade returning mode.

Abstract: A blade-switchable utility knife of the present invention comprises a housing, a blade slider, a slide actuator, a switch actuator, a pair of blades and a pair of restoring elements. By manipulating the switch actuator, one of the pair of blades is capable of moving together with the blade slider. Accordingly, the present invention has advantages and effects of quick switch of the blades for use and convenient carrying.

Abstract: A utility knife using tilting status thereof for blade switching of the present invention comprises a housing, a blade slider, a switch actuator and a pair of blades. By tilting the housing, one of the pair of blades is capable of moving together with the blade slider. Accordingly, the present invention has advantages and effects of quick switch of the blades for use and convenient carrying.

Abstract: A blade-switchable utility knife of the present invention comprises a housing, a blade slider, a slide actuator, a switch actuator, a pair of blades and a pair of restoring elements. By manipulating the switch actuator, one of the pair of blades is capable of moving together with the blade slider. Accordingly, the present invention has advantages and effects of quick switch of the blades for use and convenient carrying.

Abstract: A safe utility knife comprises a housing, a blade sliding seat, a pushing force generator, an acceleration detector, a stopper, a stopper pushing portion, and a sliding switch. When this blade sliding seat carried with a blade protruding out and an acceleration caused by a suddenly dropping down movement occurs, the acceleration detector moves from a low acceleration position to a high acceleration position. It also presses down the sliding switch and the stopper so that the stopper moves from a locking position to a non-locking position. Plus, the blade sliding seat is pulled by the pulling force generator to a blade storing position. So, this invention can avoid the user to be injured accidentally. It can be operated by one hand to protrude the blade. It is suitable for regular blades available on the market. In addition, it can switch to the mode for manual automatic blade returning.

Abstract: A utility knife includes a housing, a cutter blade magazine and a push block. The housing has an accommodation chamber, a protruding portion, and an opening for insertion of the cutter blade magazine into the accommodation chamber of the housing. The cutter blade magazine has a cutter blade chamber accommodating a number of cutter blades, a sliding slot, an outlet, a through hole for receiving the protruding portion of the housing, and a stop portion. The push block has a flexible arm, which is stopped by the stop portion of cutter blade magazine to prohibit displacement of the push block relative to the cutter blade magazine after separation of the cutter blade magazine from the housing and which is deformed by the protruding portion of the housing for allowing movement of the push block relative to the cutter blade magazine after insertion of the cutter blade magazine into the accommodation chamber of the housing.

Abstract: A utility knife includes a housing, a cutter holder, a cutter blade magazine and an elastic member. The housing has a front chamber, a rear chamber in communication with the front chamber, and an opening extending from the rear chamber to the outside. The cutter holder is mounted in the front chamber. The cutter blade magazine is inserted through the opening of the housing into the rear chamber. The cutter blade magazine has a cutter blade chamber for accommodating a plurality of cutter blades, a sliding slot, an elongated slot, an outlet in communication between the cutter blade chamber and the front chamber of the housing, and a push block slidably mounted in the cutter blade chamber. The elastic member has one end fastened to the inside of the rear chamber and the other end inserted through the elongated slot of the cutter blade magazine into the cutter blade chamber for stopping against cutter blades inside the cutter blade chamber.

Abstract: A utility knife includes a housing, a cutter holder slidably mounted in the housing for holding a cutter blade, a first compartment formed in the housing and aimed at the cutter holder, a second compartment formed in the housing for accommodating spare cutter blades, and a push block slidably mounted in the housing for pushing spare cutter blades from the second compartment into the first compartment, and a spring member provided inside the first compartment for pushing one cutter blade out of the first compartment into the cutter holder each time the cutter holder is empty.