JPS5920874Y2 - cutting tool - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention particularly relates to a cutting tool such as a cutter knife having a handle for cutting paper.

Prior Art Conventionally, in this type of cutter knife, the blade part of the blade body can be stored inside the handle, and a cutting groove that exposes the blade part is cut into the handle, and the opposing guide surface of this cutting groove is Some blades extend from the insertion opening of the cutting groove along both sides of the blade so as to intersect at an angle with respect to the longitudinal direction.

However, in a cutter knife with this structure, the object to be cut is guided by the guide surface and touches the blade so that it is inclined in the longitudinal direction of the blade, but when viewed from directly above the blade, the object to be cut is Since it is perpendicular to the blade, the cutting resistance is large, the so-called pulling effect is small, and the cutting quality is poor.

Purpose The purpose of this invention is to reduce the cutting resistance and improve the pulling effect by inclining the guide surface at least in the width direction of the guide surface, that is, in the direction perpendicular to the side surface of the blade body, at least immediately before the blade. To provide a cutting tool which can be more sharply cut and sharpened.

EXAMPLE An example of a cutter knife will be described below with reference to FIGS. 1 to 3. A guide groove 2 is formed on one side of the handle 1, and a guide 3 is movable back and forth along the guide groove 2.
This allows the blade 4 housed inside the handle 1 to protrude outward from the front end of the handle 1.

A cutting groove 5 is diagonally cut into the front upper part of the handle 1, and the blade part 4a of the blade body 4 is exposed in this cutting groove 5.

An insertion opening portion 5a that expands outward is formed at the entrance of this cutting groove 5, and the opposing guide surface 6 of the cutting groove 5 is approached just before the blade portion 4a, and the blade body 4 inside the cutting groove 5 is They are spaced apart on both sides.

The guide surface 6 extends along both side surfaces of the blade body 4 from the insertion opening 5a of the cutting groove 5 so as to be inclined and intersect with the longitudinal direction of the blade part 4a, and at least immediately before the blade part 4a. The guide surface 6 is also inclined in its width direction, that is, in the direction perpendicular to the side surface of the blade body 4.

Further, on both sides of the blade body 4, the blade body 4 is located at the inner end of the cutting groove 5.
A diagonal relief surface 7 is formed that widens outward from the side surface of the housing.

Next, a case will be described in which paper such as an envelope is cut using the cutting groove 5 of this cutter knife.

As shown in FIGS. 2 and 3, when the paper P is inserted through the insertion opening 5a of the cutting groove 5, the paper P is guided by both guide surfaces 6 and rotates in the longitudinal direction of the blade body 4 and in the orthogonal direction thereof. The blade portion 4a contacts the blade portion 4a so as to be tilted.

Then, while supporting the paper P with the fingers of the left hand, hold the handle 1 between the fingers of the right hand so as to press the guide 3 with the right thumb.
When the handle is pulled in the direction of the arrow, the paper P is cut in the direction of the arrow in FIG. be done.

At this time, immediately before the blade body 4, the guide surface 6 is also inclined in its width direction, that is, in the direction perpendicular to the blade body 4, so the cutting resistance of the paper P is reduced and the pulling effect is even more pronounced. It is possible to improve the cutting quality.

In addition, since the guide surface 6 is close to just before the blade part 4a, even if the paper P surface has wrinkles, the wrinkles can be smoothed out and the paper P can be guided to the blade part 4a, so that the paper P surface can be kept flat. It is possible to reduce the resistance and guide the cutting edge to the blade portion 4a, thereby improving the cutting quality.

Further, the guide surfaces 6 are spaced apart on both sides of the blade body 4 inside the cutting groove 5, and a relief surface 7 is provided at the inner end of the cutting groove 5.
is formed, the cut paper P can be smoothly guided to the release surface 7 and sent out to the outside of the cutting groove 5.

Note that when cutting, the guide 3 is used by pressing the thumb, but the thumb tends to slip at this time, and in order to prevent this, the guide 3 is provided with a finger rest 3a as shown in FIG.
Alternatively, as shown in FIG. 5, a finger rest 2a may be provided protrudingly along one side of the guide groove 2.

Effects As detailed above, in this invention, the blade 4 is housed inside the handle 1, a cutting groove 5 is cut into the handle 1 through which the blade part 4a of the blade 4 is exposed, and the cutting groove 5 is opposite to the cutting groove 5. Guide surface 6 to blade part 4
Since the guide surface 6 is inclined with respect to the longitudinal direction of a and at least in the width direction of the guide surface 6 immediately before the blade portion 4a, that is, in the direction perpendicular to the side surface of the blade body 4, the cutting resistance is reduced. This has an excellent effect of making the cutting action more pronounced and the cutting quality even better than that of conventional ones.

[Brief explanation of drawings]

Figure 1 is a perspective view of the cutting tool, Figure 2 is a front view of the cutting tool during cutting, Figure 3 is a partially enlarged plan view of Figure 2, and Figures 4 and 5 show the guide and guide groove. It is a partial perspective view which shows separate. Handle...1, Blade body...4, Blade...
...4a, Cutting groove...5, Insertion opening section...
・5a, Guide surface...6, Relief surface...
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Claims (1)

[Scope of claim for utility model registration] 1. A blade 4 is housed inside the handle 1, and the blade portion 4 of this blade 4 is
A cutting groove 5 that exposes a is cut into the handle 1, and the guide surface 6 facing the cutting groove 5 is inclined with respect to the longitudinal direction of the blade part 4a, and at least in the width direction of the guide surface 6 immediately before the blade part 4a. In other words, the cutting tool is characterized in that the blade body 4 is inclined also in a direction perpendicular to the side surface thereof. 2. Cutting according to claim 1 of the utility model registration, in which both guide surfaces 6 constituting the cutting groove 5 are brought close to each other just before the blade part 4a and are separated on both sides of the blade body 4 inside the cutting groove 5. Ingredients. 3. The cutting tool according to claim 1 or 2, wherein a relief surface 7 is formed at the inner end of the cutting groove 5 so that the side surface of the blade body 4 is inclined toward the outside.