JP3061090U - Crayon sharpener - Google Patents

Abstract

(57) [Summary] [PROBLEMS] A sharpener having a good cutting property without using a metal cutting blade, in a sharpener for shaping the tip of a marker-like material formed of plastic or paraffin such as crayon or crepas. The container is provided by integral molding of plastic. SOLUTION: A hollow cone-shaped pre-sharpening housing is formed in a main body housing which is surrounded on all sides by side walls, a slit is formed in the conical body in an axial direction, and an inner diameter side edge of one end face of the slit is formed. A structure was formed by hanging down to a position slightly smaller than the inner diameter and inscribed in the inner diameter with a flat surface so that the edge forms an angle of 65 to 90 degrees, and this was manufactured by integral molding of plastic.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a structure of a sharpener for a crayon, a craper, or the like, or a similar coloring tool or marker tool.

[0002]

[Prior art]

 Japanese Patent Application Laid-Open No. 3-207699 discloses a standard type of conventional polisher such as a crayon or a craper. FIG. 6 and FIG. 7 show the outline thereof, and FIG. 6 discloses a general-purpose crayon scraper as a conventional example. In this method, a conical crayon point-housing housing protrudes from the base end of the housing, and a plurality of cutting blades symmetrical about its central axis are formed on the conical wall surface.

[0003] Further, as disclosed in Japanese Patent Application Laid-Open No. 3-207699, an upper portion converging to form a top portion of a housing and an opening in a base of a housing for accommodating a crayon in the housing as shown in FIG. A first shaving having a hollow conical pre-sharpening housing with a lower portion forming a portion, the shaving extending from an opening in the base of the pre-sharing housing to approximately the top of the housing. A crayon being rotated within a pre-striking housing, including at least two shaving means such as second shaving means extending over a portion of the distance from the opening of the means and the base of the housing to the top of the housing. Asymmetric shaving means for removing a part of the surface; and at the end of the second shaving means And guide means for engaging and maintaining the crayon in a suitable pre-cutting position relative to the asymmetric shaving means; and a crayon inserted and rotated into the device; This is a device for sharpening similar marker tools.

[0004] Including the above, for example, as disclosed in Japanese Utility Model Application Laid-Open No. 63-82597 (FIG. 8), the cutting edge of a conventional crayon sharpener is made of metal like a pencil sharpener. Usually, the cutting edge angle is formed to be very acute.

[0005]

[Problems to be solved by the invention]

 As a conventional example, the crayon scraper shown in FIGS. 6 and 7 has two shaving means formed in a housing at symmetrical or asymmetrical positions. Crayons or similar markers are made of soft materials such as plastic and paraffin and are relatively soft. Therefore, a sharp cutting edge penetrates deeply into these crayons during cutting, and is rather difficult to cut. In a sharpener having two cutting edges as described above, both cutting edges have an equal sharpness. Otherwise, one will be cut deeper and the tip of the cone will not be aligned with the center of the crayon axis.

In each of the above-mentioned conventional examples, since the container-shaped portion for accommodating crayon shavings is formed in a direction perpendicular to the crayon insertion direction, the crayon is inserted vertically from below while holding the shaving device vertically. There was the inconvenience of having to rotate.

Further, in the conventional example, the cutting blade is generally formed of a metal material and attached to a plastic housing. However, when such a scraper becomes used waste, the metal is cut. It was difficult to separate waste and plastics for disposal, and their disposal was a problem.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problem, an invention according to claim 1 is to form an opening in a base end side wall of a main body housing in which a side wall is formed in a rectangular shape or one of the rectangular shapes, and a hollow conical crayon. The base-side open end of the pre-sharpening housing is coupled to the opening of the base side wall such that the top is close to the opposing side wall, and the side wall is surrounded by the crayon pre-sharpening housing. In the crayon-sharpener with the middle bottom stretched, a single slit is opened from the open end to the top of the housing in the crayon pre-sharpening housing, and one inner diameter edge of the end face sandwiching the slit is formed into the hollow circle. The projection is formed to have a slightly smaller diameter than the inner diameter of the conical portion, and the end face side of the edge is formed at an obtuse angle of 30 to 90 degrees with respect to the tangent line of the inner diameter to form a cutting edge.

In addition, since the main body housing, the crayon point-housing housing, the cutting edge portion and the insole formed in the housing are integrally formed using a plastic material, plastic and metal can be disposed of after use. The necessity of separation from the company has been eliminated.

[0010] Further, the invention according to claim 2 is that the crayon shaving device according to the present invention, in which the main body housing, the crayon shaving housing and the cutting blade are integrally formed, is molded from plastic containing an antistatic agent. The shavings were prevented from adhering to the container.

[0011]

[Embodiment of the invention]

 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a crayon scraper according to the present invention. FIGS. 2 to 5 show details thereof, and FIGS. 6 to 8 show conventional examples.

The crayon scraper 1 shown in FIG. 1 has a crayon scraper body housing 2 composed of three straight side walls 2a, 2d, 2d and an arc-shaped side wall 2b, and an arc-shaped side wall 2b of the housing 2. A circular opening 2c is formed in the base side wall 2a, which is a plane of symmetry, and a hollow conical crayon tip for inserting a crayon (including other similar markers, etc .; hereinafter collectively referred to as a crayon). The base side opening end 3a of the housing 3 is connected to the opening of the base side wall 2a, and the top 3b at the other end is integrally formed so as to approach the arcuate side wall 2b. An insole 4 is stretched in a portion surrounded by 2b, 2d, 2d and the crayon insertion housing 3.

Although the above description and FIGS. 1 to 3 show an embodiment in which one side of the side wall is formed in an arc shape, it is needless to say that a rectangle in which all four side walls are formed in a straight line may be used. It is.

The crayon insertion housing 3 is provided with a single slit 5 extending from the vicinity 3a of the opening 2c to the top 3b, and the edge of the crayon insertion housing 3 which is in contact with the inner diameter of the end face 6 on one side is formed of crayon. It is a cutting blade for shaving the surface layer of. The shavings are discharged between the other side surface 7, that is, from the slit 5.

3, 4 and 5 show details of the cutting blade surface 6 and the cutting blade. The slit 5 is formed such that the interval between the slit 5 is tapered from the opening side 3a toward the top. . That is, at the opening-side starting point 3a, it is formed so as to be slightly deviated from the center line to the one side (to the right in FIG. 2 toward the paper surface), and to be positioned substantially on the center line at the conical top 3b. Is about 45 degrees (about 20 to 50 degrees) on the opposite side of the cutting edge side end face from the center line at the opening side starting point 3a (left side in FIG. 4B toward the paper surface). It is only necessary to be able to discharge the swarf.) It is biased to the inclined position, and is arranged slightly on the top 3b on the opposite side of the center line (the left side in FIG. 2 as viewed in the drawing).

The cutting edge (edge) 6 a of the cutting edge surface 6 is formed over the entire length of the slit. That is, the edge 6a is inscribed in the inner diameter with a flat surface 8 as a small diameter portion slightly protruding in the center direction from the inner diameter of the hollow conical portion, and its end face 6 is not parallel to the center line Y in FIG. It is formed at an obtuse angle of right inclination. Therefore, the angle of the cutting edge is formed at 90 to 30 degrees.

[0017]

【Example】

 The most important point of the crayon or the like having the above configuration is the formation of the cutting edge in the crayon insertion housing 3. As for a relatively soft material such as crayon, if the cutting edge is sharp, the bite is deepened, and the crayon cannot be smoothly rotated in the pre-cut housing 3 as described above. .

The cutting edge angle formed between the end face 6 of the cutting edge surface 6 and the plane 8 shown in FIG. 4B is related to the cutting performance of the crayon, and the one shown in FIG. It is about 90 degrees. In the embodiment, a crayon sharpener formed with cutting edge angles of 25, 30, 45, 60, 75, 90, 100 and 110 degrees is integrally molded with polystyrene, and a sharpness test is performed using a commercially available crayon. Did. As a result, the smoothest sharpness was obtained when the cutting edge angle was 90 to 60 degrees, followed by the order of 30, 25 degrees. The appropriate angle is 30 to 90 degrees, and the angle of 25 degrees is hard to cut into the crayon because of its great penetration.

The crayon sharpener of the present invention is integrally formed of plastic including the cutting edge as described above, and a relatively hard molding material is desired. Using a PET, ABS resin, polycarbonate, polyacetal, polyolefin-based resin (eg, nylon, polypropylene) as a prototype, a crayon sharpener with a 90 ° cutting edge angle was prototyped, and the same test as above was performed, but good sharpness was obtained. Was done. From this, it is natural that engineering plastics and thermosetting resins having higher hardness and durability can be used.

The polystyrene (GPPS) is mixed with 5% by weight of a nonionic antistatic agent (commercially available product, for example, safamin) to form a crayon sharpener of the present invention, and the crayon is shaved. Discharge was smooth. However, if the crayon is made of plastic, the swarf itself will be charged with static electricity, so it may adhere even though the crayon scraper of the present invention uses an antistatic agent-filled resin. However, even in this case, the removal of the shavings was easier than that of a crayon shaving machine made of a resin not subjected to the antistatic treatment. The antistatic agent includes a cationic activator, an anionic activator, a nonionic activator, an amphoteric activator, and the like, and it goes without saying that the one suitable for the resin used is selected.

[0021]

[Effect of the invention]

 The crayon sharpener according to the present invention is integrally formed of plastic including the cutting blade, and does not need to be separated when discarded as unnecessary.

The body housing of the crayon sharpener, the crayon shaving housing, the insole and the cutting blade are integrally formed, so that the mounting process of the cutting blade becomes unnecessary, the manufacturing process is greatly simplified, and the product cost is reduced. Can be obtained.

Since no metal is used for the cutting blade, there is no longer a need to be worried about injuries when using such as an infant.

By forming the angle of the cutting blade at an obtuse angle, a soft crayon can be cut smoothly.

[Brief description of the drawings]

FIG. 1 is a perspective view of a crayon scraper according to the present invention.

FIG. 2 is a plan view of the crayon scraper according to the present invention.

FIG. 3 is a sectional view taken along line AA of the crayon scraper shown in FIG. 2;

4A is a cross-sectional view taken along the line BB in FIG. 2, and FIG. 4B is an enlarged end view of a main part of the end face.

FIG. 5 is a sectional view taken along the line CC in FIG. 2;

FIG. 6 is a perspective view of Conventional Example 1.

FIG. 7 is a perspective view of Conventional Example 2.

FIG. 8 is a perspective view showing a component configuration of Conventional Example 3.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crayon sharpener 2 Main body housing 3 Crayon insertion housing 4 Middle bottom 5 Slit 6 Cutting blade surface 7 Side surface 8 Flat surface

Claims (2)

[Utility model registration claims] 1. A base opening end of a hollow conical crayon pre-cutting housing is formed in a base side wall of a main body housing in which a side wall is formed in a rectangular shape or one of the rectangular shapes is formed in an arc shape. A crayon cutting tool in which a top portion of the ridge portion is coupled so as to be close to the opposing side wall, and an inner bottom is stretched at a portion surrounded by the four peripheral side walls and a crayon cutting tool housing. The housing is provided with a slit on the conical surface extending from the open end to the top of the housing, the inside edge of one end face sandwiching the slit is used as a cutting edge, and plastic is integrally molded. Crayon sharpener with a. 2. A crayon sharpener in which a main body housing, a crayon tip sharpening housing and a cutting blade are integrally formed of plastic, wherein the plastic is made to contain an antistatic agent. Sharpener.