safety cutter

Abstract

A utility knife has a handle and a blade holder that holds a utility blade for selective removal and replacement of the utility blade. The blade holder is pivotally carried by the handle for pivotal movement in an arcuate path relative to the handle between a retracted position and an extended position.

Description

technical field [0001] The invention relates to knife technology, in particular to a safety cutting knife technology. Background technique [0002] Cutter is a basic cutting tool, which has the advantages of sharp edge, compact and durable, replaceable blade, strong cutting force, fast cutting speed, etc. It is widely used in the fields of life, construction and machinery manufacturing. [0003] Existing cutting knives are basically divided into four types: [0004] The blade and the handle of the first type of cutting knife are integrally formed. The edge of the blade is exposed and cannot be put into the handle when not in use. Although this kind of cutting knife is easy to use, the exposed edge always poses a safety hazard. It is easy to cause harm to the human body and objects, and its safety is very low; [0005] The blade of the second type of cutting knife can be folded into the handle when not in use. This cutting knife requires the cooperation of two hands to fold...

AI Technical Summary

Problems solved by technology

[0004] The blade and the handle of the first type of cutting knife are integrally formed. The edge of the blade is exposed and cannot be put into the handle when not in use. Although this kind of cutting knife is easy to use, the exposed edge always poses a safety hazard. It is easy to cause harm to the human body and objects, and its safety is very low;

[0005] The blade of the second type of cutting knife can be folded into the handle when not in use. This cutting knife requires the cooperation of two hands to fold the blade into the handle, which is very inconvenient to use, and the handle area of ​​the hand and The folded areas of the blades overlap, which is easy to cut hands, and its safety is also low;

[0006] The blade of the third type of cutting knife can extend forward from the handle under the push of the user, and can be locked by the pusher. When the pusher is triggered when not in use, the blade can automatically retract back into the handle under the action of the spring Internally, since the blade of this kind of cutting knife retracts quickly under the action of elastic force, once the pusher is accidentally triggered during use, it will easily cut the human body, and its safety is also low;

[0007] The blade of the fourth kind of cutting knife can stretch out the handle of a knife forward and retract into the handle of a knife backward when the user pushes and pulls the pusher. The safety of this cutting knife is higher than that of the first three cutting knives, but due to The motion trajectory of the blade is a linear trajectory, so the speed when the blade is extended and retracted is relatively fast, and there is no buffer in the middle of the extension process. If the speed of the knife is too fast, the safety factor will be relatively On the other hand, the pusher and the knife holder are integrated, and the blade is pushed to the cutting position only by the point contact between the shrapnel on the pusher and the knife holder to realize the locking position. If the force is too large during the cutting operation, Or when the pusher is pressed by mistake, the knife holder and the blade are also relatively easy to retract into the knife handle, and it is also easy to cut the user's hand in such an accidental situation, so it also has potential safety hazards

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