Abstract: The present invention is to provide a knife configured to receive a blade securely and safely in a handle thereof. The handle is assembled at least from first to third plates. The blade has one end pivotally connected between the second and third plates. The first plate has a switch groove extending in a front-rear direction and configured to position a locking switch. The second plate has a positioning hole corresponding to the switch groove. A positioning member (e.g., a steel ball) is engaged in the positioning hole. When the blade is received in the handle, an engaging hole in the blade corresponds precisely to the positioning hole so that a user can push the locking switch against a top portion of the positioning member, and consequentially for enabling a bottom portion of the positioning member to extend into the engaging hole, thereby fixing the blade and preventing the blade from exposure.

Abstract: The present invention is a cigar cutter, which includes a housing having a hole through two corresponding sides and a first knife covering a part of the hole; a pressing portion movably embedded at one end of the housing and having a first magnetic element on one side thereof; and a knife holder movably embedded at one side of the housing and having a second magnetic element and a second knife. When the knife holder is displaced toward the housing, the first and second magnetic elements are connected together by magnetic attraction, and the first and second knives jointly cover the hole. When the pressing portion is displaced toward the housing, the first magnetic element is disconnected from the second magnetic element, and the knife holder is pushed and displaced by a spring to prevent the second knife from covering the hole that is not covered by the first knife.

Abstract: The present invention is to provide a knife including a blade and a handle, wherein the blade has a first end provided with a projection and two resilient elements, each resilient element has one end protrudingly provided with an engaging portion, and the handle has a receiving space for receiving the blade and has a first track and two second tracks provided longitudinally thereon. The projection can be movably inserted in the first track. The distance between each pair of the corresponding ends of the second tracks corresponds to the distance between the engaging portions. Thus, when the engaging portions are respectively engaged in a pair of the corresponding ends of the second tracks, the engaging portions cannot move along the second tacks, such that either the blade is completely received and positioned in the handle, or a second end of blade is extended and positioned outside the handle.

Abstract: The present invention is a cigar cutter, which includes a housing having a hole through two corresponding sides and a first knife covering a part of the hole; a pressing portion movably embedded at one end of the housing and having a first magnetic element on one side thereof; and a knife holder movably embedded at one side of the housing and having a second magnetic element and a second knife. When the knife holder is displaced toward the housing, the first and second magnetic elements are connected together by magnetic attraction, and the first and second knives jointly cover the hole. When the pressing portion is displaced toward the housing, the first magnetic element is disconnected from the second magnetic element, and the knife holder is pushed and displaced by a spring to prevent the second knife from covering the hole that is not covered by the first knife.

Abstract: The present invention is to provide a knife including a blade and a handle, wherein the blade has a first end provided with a projection and two resilient elements, each resilient element has one end protrudingly provided with an engaging portion, and the handle has a receiving space for receiving the blade and has a first track and two second tracks provided longitudinally thereon. The projection can be movably inserted in the first track. The distance between each pair of the corresponding ends of the second tracks corresponds to the distance between the engaging portions. Thus, when the engaging portions are respectively engaged in a pair of the corresponding ends of the second tracks, the engaging portions cannot move along the second tacks, such that either the blade is completely received and positioned in the handle, or a second end of blade is extended and positioned outside the handle.

Abstract: The invention discloses a processing method and device for image encryption and decryption. The processing method is first to obtain at least one main film and at least one subsidiary film. Then, when the at least one main film and the at least one subsidiary film are playing, the video signals will be synchronously inputted into the composite video-signal processing unit for processing composite video signals. Next, when the video signals of the at least one main film and at least one subsidiary film are executing the composite video signal process, a markup signal is added into each field of the main film synchronously. Thus, an encrypted composite film is completed. In addition, after the analog video signal in the encrypted composite film has been converted into a digital video signal output through the analog/digital converter, the digital video signal output will be stored in the memory unit. Then, the detection control unit will determine whether the data in the memory should be updated.