Eraser

Abstract

Provide a simple and new eraser that is easy to hold, easy to apply force due to its easy-to-grip shape, brings ease of use to the user, can improve the learning efficiency of preschool children, elementary school students, college students, or graduate students, and adults, as well as the work efficiency of working people, and can be easily accommodated in a pencil case or the like. 【Solution means】An eraser characterized by a shape in which one or more sides of a rectangle projected onto a plane from a solid with a polygonal planar shape are outside the polygon, and one or more identical rectangular parallelepipeds whose bottom rectangle is parallel to the polygon of the bottom of the polyhedral solid, or one or more identical spheres in which a circle projected onto a plane is inside the polygon are cut out.

Description

Technical Field

[0001] The present invention relates to erasers.

Background Art

[0002] Conventionally, erasers having a rectangular parallelepiped shape have been widely used. In particular, when primary school students to university students study, there is a demand for erasers that can effectively and efficiently erase. Especially for primary school students to university students who often take tests within a limited time, there is a strong tendency to strongly demand erasers that can quickly and neatly erase.

[0003] When using a rectangular parallelepiped eraser, since the corners tend to be effective in effectively erasing fine parts, an eraser having a shape formed by combining a plurality of rectangular parallelepipeds or cubes and having corners protruding outward (hereinafter referred to as "multi-corner eraser") is created. For example, Patent Document 1 is known.

[0004] These multi-corner erasers can effectively erase fine parts by their corners, but on the other hand, due to their complex shapes, they tend to be difficult to hold, it may be difficult to apply force, and since the connecting parts between the protruding parts are small, they tend to bend easily, which tends to hinder the user from efficiently erasing the eraser.

[0005] In addition to multi-corner erasers, in order to provide more corners, an eraser having a unique shape with V-shaped notches throughout the periphery in a plan view (hereinafter referred to as "corner eraser") is created. For example, Patent Document 2 is known.

[0006] Compared with multi-corner erasers, corner erasers do not have small parts, but due to their complex shapes, users tend to feel difficult to hold and tend to feel difficult to use when erasing.

[0007] Against such a backdrop, the emergence of a new and simple eraser that is easier to grip, easier to erase with pressure, and different from multi-corner erasers and square erasers is expected.

Prior Art Documents

Patent Documents

[0008]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0009] The present invention has been made in view of the above circumstances, and an object thereof is to provide an eraser that can improve work efficiency, learning efficiency, and can be manufactured at low cost, and can be easily accommodated in a pencil case or the like by allowing the user to erase efficiently.

[0010] When elementary school students to high school students are learning, the importance of learning by computer is increasing. However, during the period from elementary school students to high school students when they acquire learning postures, it is important to increase the opportunities to actively write or draw using pencils and erasers. The act of erasing what one has written or drawn often means starting over for the learner, and a simple eraser that can be erased effectively and efficiently is important for learning.

[0011] The main object of the present invention is to improve learning efficiency by enabling elementary school students to high school students to learn efficiently and with free thinking when they are learning. With the advent of the Internet society, the learning by elementary school students to high school students through searching on notebook computers and inputting into notebook computers has increased, and the opportunities to write or draw by hand have decreased. In this social environment, an object of the present invention is to provide an eraser that allows elementary school students to high school students to learn efficiently while feeling the fun of writing or drawing by hand, and can be effectively used by college students to adults.

Means for Solving the Problem

[0012] An object of the present invention is a polygon solid in the shape of a column with a polygonal planar shape that can be efficiently erased from children to adults. One or more identical rectangular parallelepipeds or spheres are used to cut out a part of the polygon solid, and the shape is characterized by having one or more cut-out parts. The eraser has a groove where a finger can be inserted, improving the ease of gripping and applying force.

[0013] The planar shape of the polygon solid is preferably a regular polygon shape such as a square, rectangle, or regular hexagon.

[0014] In the shape where a rectangular parallelepiped is cut out from the polygon solid, the part to be cut out The planar shape of the pentagon is preferably the shape of a line object.

[0015] The present invention is not limited to the general white color of the eraser, and it can be made of colored materials.

Effects of the Invention

[0016] According to the present invention, since it has a shape that is easy to hold and apply force, a new eraser can be realized that allows users to efficiently study and work.

Brief Description of the Drawings

[0017]

Figure 1

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Figure 11

Mode for Carrying Out the Invention

[0018] An embodiment of the present invention will be described with reference to the drawings. Specific examples of the embodiments of the present invention are not limited to the following embodiments, Example 1 and Example 2. In addition, for the sake of easy understanding of the description, the same numbers are assigned to the similar parts and members in the drawings.

[0019] Figs. 1, 2, and 3 show the eraser according to the present embodiment. Fig. 1 shows the perspective view of the present embodiment, Fig. 2 shows the plan view, Fig. 3(a) shows the front view, and (b) shows the side view. It is the most basic shape in which a rectangular parallelepiped is removed from a rectangular parallelepiped, and it is easy to apply force and easy to use. Fig. 4 shows the perspective view of the rectangular parallelepiped with the solid part of the rectangular plane removed, and the eraser according to the present embodiment in Fig. 1 is indicated by a dotted line.

[0020] Specific configurations of other parts can be variously modified without departing from the gist of the present invention.

Examples

[0021] Example 1 As an example, Example 1 of the present invention will be described with reference to the drawings. Fig. 5 shows the perspective view of Example 1, Fig. 6 shows the plan view, Fig. 7 shows (c) the front view, and (d) the side view. It is a shape in which two rectangular parallelepipeds are removed from a regular hexagonal solid with a regular hexagonal planar shape, and the planar shapes of the removed parts are each pentagonal. Since the shape of Example 1 has more corners than the present embodiment and a general rectangular parallelepiped eraser, fine parts can be effectively erased.

[0022] Example 2 As an example, Example 2 of the present invention will be described with reference to the drawings. FIG. 8 shows a perspective view of Example 2, FIG. 9 shows a plan view, FIG. 10(e) shows a front view, and (f) shows a side view. It has a shape in which one elongated rectangular parallelepiped is removed from a regular octagonal solid with a regular octagonal planar shape, and the planar shape of the removed portion is a pentagon. FIG. 11 shows a perspective view of the rectangular parallelepiped that removes a part of the solid with the regular octagonal plane, and the regular octagonal solid in FIG. 8 is shown by a dotted line. The shape of Example 2 has a wider removed portion with respect to the width of the eraser than in this embodiment and Example 1, so that some users can apply more force and effectively erase.

Industrial Applicability

[0023] The eraser according to the present invention can be widely applied to all fields of daily life, such as a writing instrument when learning widely from preschool children, primary school students, college students, graduate students, to adults, or a writing instrument when a working person is on business. Raw

Explanation of Signs

[0024] 1 ··· Eraser 11 ··· Among the six surfaces constituting the polygonal solid with a polygonal plane or a polygonal cross-section, the surface removed by the rectangular parallelepiped 12 ··· Among the six surfaces constituting the polygonal solid with a polygonal plane or a polygonal cross-section, the surface not removed by the rectangular parallelepiped 21 ··· Groove portion removed by the rectangular parallelepiped 31 ··· Rectangular parallelepiped that removes a part from the polygonal solid

Claims

1. This eraser is characterized in that it has a shape in which one or more parts of a cylindrical polygonal solid having a polygonal planar shape are cut away by one or more identical rectangular parallelepipeds, one or more sides of which, when projected onto a plane, are outside the polygon and the rectangular base is parallel to the polygonal base of the polygonal solid, and the planar shape of the cut-away parts is a pentagon.

2. 2. The eraser according to claim 1, characterized in that the polygonal solid has one or more parts cut away by one or more identical spheres, the circle of which, when projected onto a plane, is inside the polygon.

Images