eraser

Abstract

To provide an eraser having a substantially rectangular parallelepiped shape (quadrangular columnar shape) and capable of responding to a request for erasing a fine part and also responding to another request for erasing a wide part in a planar manner.SOLUTION: An eraser E1 with an outline shape of a substantially rectangular parallelepiped shape, when viewed from the front, includes a corner portion 3 forming a vertex of a virtual rectangle R and the vicinity thereof, and a surface portion 5 having a concave portion 5a located between corner portions 3 adjacent to each other. A configuration that the corner portions 3 are hard portions H made of hard material compared to other portions is adopted.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an eraser having a generally rectangular parallelepiped shape as a whole. [Background technology]

[0002] Conventionally, erasers having various shapes have been devised to meet the demand for erasing small details (see, for example, Patent Documents 1 and 2).

[0003] However, although the erasers having the shapes described in Patent Documents 1 and 2 can certainly meet the need to erase small details, they have the following problems.

[0004] That is, the eraser described in the cited document 1 is roughly rectangular in front view, with all four sides recessed toward the center, and the corners protrude outward at acute angles. With this shape, the tips of the corners are thin and sharp, which poses a problem of poor durability.

[0005] In addition, the eraser described in Patent Document 2 has a different shape from the generally available rectangular parallelepiped erasers. In other words, there is a problem that the shape is special and cannot necessarily be used for general purposes. There is also a problem that such a shape cannot necessarily meet other demands such as erasing a wide area. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Utility Model Application Publication No. 50-140550 [Patent Document 2] JP 2016-120688 A Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in consideration of the points mentioned above, and provides an eraser that is roughly rectangular (prism-shaped) and can meet the demand for erasing small details while also meeting other demands such as erasing large areas over a wide area. [Means for solving the problem]

[0008] The eraser of the invention described in claim 1 has a rough shape of a roughly rectangular parallelepiped, and when viewed from the front, has corners that form the vertices of an imaginary rectangle and their vicinity, and a surface portion that is located between adjacent corners and has one or more recesses that are recessed toward the center, and the corners are hard parts formed from a harder material compared to other parts.

[0009] The eraser according to the invention described in claim 2 is the eraser described in claim 1, in which the hard parts of the corners extend in the longitudinal direction.

[0010] The eraser according to the invention described in claim 3 is the eraser described in claim 2, in which the hard parts of the corners located diagonally opposite each other when viewed from the front are connected by a hard part in the middle.

[0013] Claim 4 The eraser according to the invention described in the above claims 1 and 2 or The eraser body is housed in a rectangular, cylindrical case, and the case is slidable while making sliding contact with the hard parts at the corners. When the part of the case that corresponds to the surface is gripped, the case deforms and comes into contact with the eraser body, preventing it from sliding.

[0014] Claim 5 The eraser according to the invention described in the claims 4 The eraser body has a concave surface in the entirety that is recessed toward the center, and when the area of ​​the case that corresponds to the surface is gripped, the case deforms and comes into contact with the surface of the eraser body's surface.

[0015] In this specification, the term "rectangle" includes a rectangular shape and a square shape. Furthermore, a front view is a view of the eraser as seen from either of its longitudinal end faces. Effect of the Invention

[0016] According to the present invention, it is possible to provide an eraser that is roughly rectangular (square prism-shaped), that meets the need to erase small details while ensuring durability and that can also meet other needs such as erasing large areas. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is an overall perspective view showing an eraser according to a first embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. 4 is an explanatory diagram showing how to use the eraser according to the embodiment. [Figure 4] FIG. 11 is an overall perspective view showing an eraser according to a second embodiment of the present invention. [Diagram 5] FIG. [Figure 6] FIG. 11 is an overall perspective view showing an eraser according to a third embodiment of the present invention. [Figure 7] FIG. [Figure 8] FIG. 11 is an overall perspective view showing an eraser according to a fourth embodiment of the present invention. [Figure 9] FIG. [Figure 10] FIG. 13 is an overall perspective view showing an eraser according to a fifth embodiment of the present invention. [Figure 11] FIG. [Figure 12] FIG. 13 is an overall perspective view showing an eraser according to a sixth embodiment of the present invention. [Figure 13] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0019] <First embodiment (FIGS. 1 to 3)> The eraser E1 according to this embodiment comprises an eraser body 1 housed in a rectangular, tubular case 2. In order to more clearly show the eraser body 1 as a whole, the case 2 is shown by imaginary lines.

[0020] The eraser body 1 has a rough shape of a rectangular parallelepiped, and when viewed from the front, has corner portions 3 that form the vertices of an imaginary rectangle R and their vicinity, diagonal connection portions 4 that are formed along the diagonals of the imaginary rectangle R and connect the corners 3 located on both sides of the diagonal, and a surface portion 5 that is located between adjacent corners 2 along the sides of the imaginary rectangle R.

[0021] In this embodiment, the corner 3 forms a columnar body extending in the longitudinal direction of the eraser body 1, i.e., a virtual rectangular parallelepiped RR in Figures 1 and 2. In addition, both outer surfaces 3a of this corner 3 coincide with the ends of each side of the virtual rectangle R in Figures 1 and 2 when viewed from the front, and are perpendicular to each other. Note that both outer surfaces 3a of the corner 3 may be substantially or completely perpendicular to each other.

[0022] As described above, the diagonal connection portion 4 is formed along the diagonal line of the imaginary rectangle R, and is molded integrally with the corner portion 3.

[0023] As described above, the surface portion 5 is located between the adjacent corner portions 2 along the sides of the imaginary rectangle R, and the entire surface thereof forms a recessed portion 5a having a smooth concave curved shape.

[0024] This eraser also consists of a hard part H made of a hard material, and a soft part S made of a material softer than the material that forms the hard part H. In the drawings, the hard part H is patterned (lightly filled in). Note that a "hard material" refers to a material that contains a small proportion of plasticizer and / or a large proportion of hard additives such as calcium carbonate (CaCO3), while a "soft material" refers to a material that contains a large proportion of plasticizer and / or a small proportion of hard additives such as calcium carbonate (CaCO3).

[0025] In the eraser body E1 of this embodiment, the portion including the corner portion 3, specifically the corner portion 3 and the diagonal connection portion 4, is the hard portion H, and the other portions, specifically the surface portion 5, is the soft portion S. Here, the corner portion 3 is the “hard portion of the corner portion” in claim 2, and the diagonal connection portion 4 is the “middle hard portion” in claim 3.

[0026] On the other hand, the case 2 is slidable while making sliding contact with the corners 3 of the eraser body 1, and is, for example, a square cylinder made of paper. The inner peripheral surface 2a of this case coincides with the outer peripheral surface of a square prism (rectangular parallelepiped) with the imaginary rectangle R as its base, and is separated from the recesses 5a of the surface 5 of the eraser body 1 when the eraser E1 is not being gripped.

[0027] This eraser E1 is mainly used in the manner described below.

[0028] That is, when erasing a small area, the corner 3 is rubbed against the desired area. At this time, the area adjacent to the corner 3 is the recess 5a of the surface 5, so only the corner 3 comes into contact with the writing surface. Furthermore, with continued use, the corner 3 wears down while still protruding outward, so that the corner 3 comes into contact with the desired area. In other words, in the state shown in Figure 3, for example, the area A comes into contact with the desired area.

[0029] On the other hand, when erasing a wide area, hold the area of ​​the case 2 that corresponds to the surface 5 and rub one side of the eraser body 1 against the writing surface. At this time, the case 2 deforms and comes into contact with the surface 5 of the eraser body 1, preventing the case 2 from sliding relative to the eraser body 1.

[0030] As described above, according to this embodiment, the corners 3 can be used to erase small details, and the eraser has superior durability compared to the eraser described in Patent Document 1, which has sharp corners. Furthermore, by holding the part of the case 2 corresponding to the surface 5 while pressing one side of the eraser body 1 against the paper surface, it is possible to erase large areas in a planar manner.

[0031] In addition, since the corners 3 which are the hard parts H extend in the longitudinal direction, even if the corners 3 wear down, the hard parts H continue to be exposed, so that the durability as an eraser can be more effectively ensured.

[0032] Furthermore, when viewed from the front, the corners 3 located diagonally opposite each other are connected by the diagonal connecting parts 4 which are hard parts, so even if the eraser body 1 wears down due to repeated erasing operations using the corners 3, the hard parts H continue to be exposed with a stable width.

[0033] Furthermore, since the corners 3 form an imaginary rectangular parallelepiped RR, the shape is relatively simple and the eraser body 1 is easy to manufacture.

[0034] <Second embodiment (FIGS. 4 and 5)> The eraser E2 according to this embodiment differs from the eraser E1 according to the first embodiment in the following respects, but has a similar configuration in other respects. Therefore, the parts corresponding to those according to the first embodiment are given the same reference numerals and the description thereof will be omitted.

[0035] In this eraser E2, only the corners 3 form the hard parts H, and the other parts form the soft parts S. That is, the hard parts H are the four corners 3 each forming a rectangular parallelepiped. On the other hand, the soft parts S are composed of surface parts 5 that connect the adjacent corners 3 along the sides of the imaginary rectangle R, and a central soft part 6 that further connects the surface parts 5 together.

[0036] With the configuration of this embodiment, it is possible to erase small details by utilizing the corner portion 3, and it is also possible to erase large areas by holding the part of the case 2 corresponding to the face portion 5 and pressing one side of the eraser body 1 against the paper surface.

[0037] In addition, since the corners 3 which are the hard parts H extend in the longitudinal direction, even if the corners 3 wear down, the hard parts H continue to be exposed, ensuring durability as an eraser.

[0038] Furthermore, since the corners 3 are rectangular parallelepiped, the shape is relatively simple and the eraser body 1 is easy to manufacture.

[0039] <Third embodiment (FIGS. 6 to 7)> The eraser E3 according to this embodiment differs from the eraser E2 according to the second embodiment described above in the following respects, but has a similar configuration in other respects. Therefore, the parts corresponding to those according to the first and second embodiments are given the same reference numerals and the description thereof will be omitted.

[0040] In this eraser E3, only the corners 3 form the hard parts H, and the other parts form the soft parts S. That is, the hard parts H are the four corners 3 each forming a rectangular parallelepiped. On the other hand, the soft parts S are composed of surface parts 5 that connect the adjacent corners 3 along the sides of the imaginary rectangle R, and a central soft part 6 that further connects the surface parts 5 together.

[0041] In addition, the entire surface of the face 5 of this eraser also forms a recess 5a, but the middle part is a planar bottom portion 5a1 that is parallel to the corresponding side of the imaginary rectangle R when viewed in a plane, and the part adjacent to the corner 3 is a chamfered portion 5a2.

[0042] The configuration of this embodiment also makes it possible to obtain the main effects of the present invention described above.

[0043] <Fourth embodiment (FIGS. 8 to 9)> The eraser E4 according to this embodiment differs from the eraser E2 according to the second embodiment described above in the following respects, but has a similar configuration in other respects. Therefore, the parts corresponding to those according to the first and second embodiments are given the same reference numerals and the description thereof will be omitted.

[0044] In this eraser E4, only the corners 3 form the hard parts H, and the other parts form the soft parts S. That is, the hard parts H are the four corners 3 each forming a rectangular parallelepiped. On the other hand, the soft parts S are composed of surface parts 5 that connect the adjacent corners 3 along the sides of the imaginary rectangle R, and a central soft part 6 that further connects the surface parts 5 together.

[0045] In addition, the surface portion 5 of this eraser is provided with recesses 5a that are semicircular when viewed from the front only in the portion between the corners 3 located on both sides of the short sides of the imaginary rectangle R and in the portion adjacent to the corners 3 located on both sides of the long sides of the imaginary rectangle R, and the portion corresponding to the middle of the long sides of the imaginary rectangle R is a flat portion 5b that coincides with the sides of the imaginary rectangle R when viewed from the front.

[0046] The configuration of this embodiment also makes it possible to obtain the main effects of the present invention described above.

[0047] <Fifth embodiment (FIGS. 10 and 11)> The eraser E5 according to this embodiment has a configuration similar to that of the eraser E5 according to the fourth embodiment, but the shape of the recess 5a is V-shaped rather than semicircular. Hereinafter, parts corresponding to those according to the first, second and fourth embodiments will be given the same reference numerals and will not be described.

[0048] The configuration of this embodiment also makes it possible to obtain the main effects of the present invention described above.

[0049] In addition, the third to fifth embodiments described above may adopt an aspect in which, like the first embodiment described above, a diagonal connection portion is provided that connects corners on diagonals of a virtual rectangle, and the corners and the diagonal connection portion form a hard portion.

[0050] Sixth embodiment (FIGS. 12 and 13) The eraser E6 according to this embodiment also comprises an eraser body 1 housed in a rectangular, tubular case X2.

[0051] The eraser body 1 has a roughly rectangular parallelepiped shape, and when viewed from the front, it has a columnar body, specifically a cylindrical corner portion X3, which forms the vertices and their vicinity of the virtual rectangle R, and a surface portion 5 which connects these corner portions X3 and is recessed toward the center. In this embodiment, when viewed from the front, the surface of each surface portion 5 coincides with the middle portion of each side of the virtual rectangle R, and a part of the corner portion X3 is shaped to protrude outside the virtual rectangle R. In other words, the surface of each surface portion 5 is recessed from the protruding end of the corner portion X3 toward the center, forming a recess 5a.

[0052] In addition, in this eraser E6, only the corners X3 form the hard parts H, and the other parts form the soft parts S. That is, the hard parts H are the four corners X3 each forming a rectangular parallelepiped. On the other hand, the soft parts S are composed of surface parts 5 that connect the adjacent corners X3 along the sides of the imaginary rectangle R, and a central soft part 6 that further connects the surface parts 5.

[0053] On the other hand, the case X2 of this embodiment is a generally rectangular parallelepiped and cylindrical shape with rounded corners when viewed from the front, and the rounded corners of the inner surface X2a of the case X2 are in sliding contact with the corners X3 of the eraser body 1, while the other parts are flat. The recess 5a of the eraser body 1 is spaced from the inner surface X2a of the case X2.

[0054] With the configuration of this embodiment, it is possible to erase small details by utilizing the corner portion X3, and it is also possible to erase large areas by holding the area corresponding to the face portion 5 of the case 2 and pressing one side of the eraser body 1 against the paper surface.

[0055] In addition, since the corners X3, which are the hard portions H, extend in the longitudinal direction, even if the corners X3 wear down, the hard portions H continue to be exposed, ensuring durability as an eraser.

[0056] Furthermore, since the corner X3 is cylindrical, the shape is relatively simple and the eraser body 1 is easy to manufacture.

[0057] As with the first embodiment described above, this sixth embodiment may also adopt an aspect in which a diagonal connection portion is provided that connects corners on diagonals of a virtual rectangle, and a hard portion is formed by the corners and the diagonal connection portion.

[0058] The present invention is not limited to the above-described embodiments.

[0063] In addition, it is not necessary that the eraser body is stored in a case, and it is not necessary that the case is such that when the part corresponding to the face of the eraser body is gripped, the case deforms and contacts the surface of the face of the eraser body. However, if the eraser body is stored in a case and the case is slidable while sliding against the hard part of the corner, the corner of the eraser body functions as a guide for sliding the case. On top of that, if the case is such that when the part corresponding to the face of the case is gripped, the case deforms and contacts the eraser body, especially the surface of the face, and the sliding is suppressed, the gripping force for gripping the eraser body and the frictional force between the case and the eraser body can be used to effectively suppress the sliding of the case.

[0064] In addition, various modifications may be made without departing from the spirit of the present invention. [Explanation of symbols]

[0065] E1~E6…Eraser 1…Eraser body 2. Case 3... Corner (hard part of corner) 4...Diagonal connection part (hard part in the middle) 5…face part 5a…Recess R…Virtual rectangle H…Hard part

Claims

1. An eraser having a rough shape of a roughly rectangular parallelepiped, and having, when viewed from the front, corners that form the vertices of an imaginary rectangle and their vicinity, and a surface portion having one or more recesses located between adjacent corners and recessed toward the center, wherein the corners are hard portions formed from a harder material compared to other portions.

2. 2. The eraser according to claim 1, wherein the hard portion of the corner extends in the longitudinal direction.

3. 3. The eraser according to claim 2, wherein the hard parts of the corners located diagonally opposite each other when viewed from the front are connected to each other by an intermediate hard part.

4. An eraser according to claim 1, 2 or 3, in which the eraser body is housed in a rectangular, cylindrical case, the case is slidable while making sliding contact with the hard parts at the corners, and when a part of the case corresponding to the surface part is gripped, the case deforms and comes into contact with the eraser body, thereby preventing it from sliding.

5. 5. The eraser according to claim 4, wherein the entire surface of the eraser body is concave toward the center, and when a portion of the case corresponding to the surface of the eraser body is gripped, the case deforms and comes into contact with the surface of the eraser body's surface.

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