CN204763925U - Rubber sack and rubber - Google Patents

Abstract

The utility model provides a rubber cover which is difficult to cause cracks or cracks in the rubber. The rubber case has a square tube-shaped main body (3) for accommodating a cuboid-shaped rubber (2). A protruding portion (4) protruding in a direction in which the main body (3) extends is provided on one end side of the main body (3). The protruding portion (4) is arc-shaped and follows the large-area portion (17a) of the eraser (2). An ink application part (5) to which ink is applied is provided on the protruding part (4). In addition, the rubber cover (1) is made of elastically deformable thick paper together with the rubber (2). Therefore, when erasing characters, if the rubber (2) bends, the protruding part (4) can also be bent in the same way, and the protruding part (4) will not be inserted into the rubber (2), and the rubber (2) will not crack.

Description

Rubber Covers and Erasers

technical field

The utility model relates to a rubber sleeve for accommodating rubber. In addition, the utility model relates to a rubber with a sleeve.

Background technique

Erasers (eraser erasers) have been used in a wide range of age groups from infants to adults. The shape of the eraser is various, and the mainstream is a rectangular parallelepiped structure according to the degree of easy to hold, easy to use, and easy to manufacture. In addition, the size of the eraser is also various, and an appropriate size that is easy to hold is preferable in consideration of ease of use. Furthermore, the eraser is used in a state stored in a rubber case. In addition, erasers are often sold in a state inserted into a rubber case made of paper or the like.

As shown in FIG. 7 , the rubber sheath 61 is slightly shorter than the rubber sheath 62 , and a part of the rubber sheath 62 is exposed from the rubber sheath 61 to form an exposed portion 62 a. As shown in FIG. 8( a ), the user holds the eraser 62 through the rubber sheath 61 , and rubs the exposed portion 62 a of the eraser 62 against an object 60 to erase characters such as paper to perform the eraser operation.

As shown in Figure 8 (a), when performing the character erasing operation, the eraser 62 that is pressed on the character eraser object 60 is pressed at the edge 61a of the rubber cover 61, and there is a small hole at the position abutting against the edge 61a. crack. That is, the front end portion of the exposed portion 62 a of the eraser 62 abuts against the character-erasing object 60 . Furthermore, the rubber 62 is gripped by the user's fingers via the rubber sheath 61 in the vicinity of the edge 61 a. The user moves the eraser 62 back and forth along the directions indicated by the arrow A1 in FIG. 8( a ) and the arrow A2 in FIG. 8( b ), to remove characters or lines on the object 60 to be erased. At this time, the rubber 62 has cracks at the portion abutting against the edge 61 a of the rubber sheath 61 .

Furthermore, during the reciprocating movement of the rubber 62 along the directions shown by the arrows A1 and A2, the rubber 62 is repeatedly bent in one direction and bent in the opposite direction so that the crack expands, and a crack occurs on the rubber 62 as shown in FIG. 8( b ). Crack 63. Also, as shown in FIG. 9, the rubber 62 is broken.

Therefore, for example, Patent Document 1 discloses a rubber case obtained by researching so that the rubber does not break. As shown in FIG. 10 , Patent Document 1 discloses a structure in which a substantially U-shaped notch 73 is provided at a corner portion of an edge 71 a of one end of a rubber sheath 71 where the rubber 72 is exposed. In this way, the edge 71a of the rubber case 71 is hardly pressed against the rubber 72 during the character erasing operation by providing the substantially U-shaped notch 73 at the corner portion of the edge 71a of the rubber case 71, and the rubber 72 is difficult to crack.

prior art literature

Patent Document 1: Japanese Publication No. 3-7193

Contents of the invention

However, the inventors of the present invention have tried, and as a result, it has been found that even with the rubber case having the structure of Patent Document 1, cracks still occur in the rubber.

Therefore, the purpose of this utility model is to provide a kind of rubber sheath that cracks hardly occur in the rubber.

The utility model for solving the above-mentioned problems provides a rubber sleeve, which is in the shape of a square tube, has an opening at least on one end side, is installed on the rubber to cover a part of the rubber, and makes a part of the rubber protrude from the above-mentioned opening, and the above-mentioned The rubber is roughly cuboid, and has two large-area parts with the largest areas, front and rear end faces with the smallest areas, and two middle-area parts with medium areas. The above-mentioned rubber cover is characterized in that it has a large A pair of first covering parts of a part of the area part and a second covering part covering a part of the middle area part of the above-mentioned rubber, and a protruding part is provided at the end of the above-mentioned first covering part on the side of the above-mentioned one end of the rubber sheath. The protruding portion protrudes in an arc shape and follows the surface of the eraser, and the protruding portion can elastically deform together with the eraser.

Preferably, unevenness is provided on the outer surface of the protrusion.

In the above-mentioned utility model, there are a pair of first covering parts covering a part of the large area part of the rubber and a second covering part covering part of the middle area part of the rubber, and the periphery of the rubber is covered by the rubber sheath.

A protruding part is provided at the end of the first covering part on one end side of the rubber sheath. The protruding part protrudes in an arc shape and follows the surface of the rubber, so that the central part of the protruding part is closer to the front end face of the rubber than the two end parts. . That is, both ends of the protruding portion are located behind the central portion. Therefore, the user holds the central part of the protruding part and fixes the central part of the protruding part to the eraser, and the edges of the two end parts of the protruding part will not be pressed against the eraser during the character erasing operation. Thus, the rubber is less prone to cracks.

In addition, the protruding part can elastically deform together with the eraser, so even if the front end of the eraser is pressed against the object to be erased and the eraser is elastically deformed during the erasing operation, the protruding part will also elastically deform along with the eraser, so the eraser is difficult to remove. Pressed by the edge of the protrusion. Therefore, cracks or fissures are less likely to occur at the portion of the eraser that is in contact with the edge of the protruding portion. That is, the eraser is hard to break.

Furthermore, when the outer surface of the protruding part is provided with concavities and convexities, the user of the eraser can easily hold the protruding part, and it is difficult to slip between the hand (finger) and the rubber sheath during the character erasing operation. Accordingly, the user of the eraser can easily remove the characters and lines to be erased without holding the eraser forcefully.

Here, the unevenness provided on the outer surface of the protrusion can be formed by affixing another member to the protrusion, or can be formed by partially cutting off the outer surface of the protrusion.

Preferably, the unevenness is formed three-dimensionally by UV ink applied to the surface of the protruding portion.

In the above-mentioned invention, since the unevenness is formed three-dimensionally by the UV ink applied to the surface of the protrusion, the unevenness can be formed very easily.

Preferably, the second covering portion on the one end side of the rubber boot is provided with an arc-shaped receding portion receding toward the other end side of the boot.

In the utility model, the second covering portion on one end side of the rubber sheath is provided with an arc-shaped receding portion that recedes to the other end side of the rubber sheath, so that even if the eraser is pressed against the object to be erased, it will be elastically deformed. , the rubber is not easily pressed by the second covering part of the rubber sheath. Therefore, the eraser is hard to break.

Preferably, a plurality of annular shearing lines are provided at predetermined intervals across the pair of first covering portions and the pair of second covering portions.

In the present invention, a plurality of annular shear lines crossing a pair of first covering parts and a pair of second covering parts are provided at predetermined intervals, so cutting (cutting) along the cutting lines is possible. off) part of the rubber sleeve. That is, the length of the rubber boot can be shortened. Since the respective cutting lines are provided at predetermined intervals, as the rubber is consumed and becomes shorter, the length of the rubber case can be easily adjusted by appropriately cutting along the cutting lines.

Preferably, it consists of thick paper.

In the present invention, since the rubber sheath is made of thick paper, the protrusion can easily follow the elastically deformed rubber. Therefore, it is difficult for the edge of the protrusion to cause cracks on the surface of the eraser.

It is preferable that the side constituted by the protruding portion is an arched shape continuously formed from one end to the other end over the entire width of the first covering portion.

Preferably, there is provided a rubber case which is in the shape of a square tube, has an opening at least on one end side, is installed on the rubber to cover a part of the rubber, and makes a part of the rubber protrude from the opening, and the rubber is approximately rectangular parallelepiped , having two large-area parts with the largest area, a front face and a rear-end face with the smallest area, and two middle-area parts with a medium area. In the above-mentioned rubber case, there is a A pair of first covering part and a second covering part covering a part of the middle area part of the above-mentioned rubber, the above-mentioned first covering part and the second covering part are made of thick paper, and the above-mentioned The end of the first covering part is provided with a protruding part, and the above-mentioned protruding part protrudes in an arc shape and follows the surface of the rubber. The above-mentioned protruding part can elastically deform together with the above-mentioned rubber. The ink is formed with concavities and convexities, and the second covering part is provided with an arc-shaped receding part receding to the other end side of the rubber sheath, and the protruding part of the first covering part is smoothly connected with the concave part of the second covering part, A plurality of ring-shaped cutouts are provided at predetermined intervals from the one end side to the other end side across the pair of first covering parts and the pair of second covering parts.

A rubber case according to another embodiment has a square tube shape, has an opening at least on one end side, is installed on the rubber to cover a part of the rubber, and makes a part of the rubber protrude from the opening, and the rubber is a substantially rectangular parallelepiped and has The two large-area parts with the largest area, the front face and the rear end face with the smallest area, and the two middle-area parts with an intermediate area, in the above-mentioned rubber case, there is a pair that covers part of the large-area parts of the above-mentioned rubber. The first covering part and the second covering part covering a part of the middle area part of the above-mentioned rubber, the above-mentioned first covering part and the second covering part are made of thick paper, and the above-mentioned first covering part on the above-mentioned one end side of the rubber sheath The end of the covering part is provided with a protruding part, and the side formed by the protruding part is an arc formed continuously from one end to the other end of the entire width of the first covering part, and the above-mentioned protruding part is along the surface of the eraser, and the above-mentioned protruding part It can be elastically deformed together with the above-mentioned rubber, and the outer surface of the above-mentioned protruding part is formed with unevenness, and the above-mentioned second covering part is provided with an arc-shaped receding part that retreats to the other end side of the rubber sheath, and the first covering part The protruding part of the second covering part is smoothly connected with the concave part.

Preferably, a plurality of annular shearing lines are provided at predetermined intervals across the pair of first covering portions and the pair of second covering portions.

The rubber that the utility model relates to is equipped with the above-mentioned rubber sleeve.

Invention effect

The rubber sheath of the utility model makes the rubber difficult to be damaged during the operation of erasing characters.

Description of drawings

FIG. 1 is a perspective view of a rubber boot according to this embodiment.

Fig. 2 is a perspective view of the rubber sheath of Fig. 1 viewed from different directions.

Fig. 3 is a perspective view showing a state in which an eraser is accommodated in the rubber case of Fig. 1 .

Fig. 4 shows the eraser in the erasing operation through the long edge corners of the eraser, (a) is a side view, and (b) is an A-A view of (a).

Fig. 5 shows the eraser in the erasing operation through the short edge corners of the eraser, (a) is a side view, and (b) is a BB-direction view of (a).

Fig. 6 is a rubber boot according to this embodiment different from Fig. 1 , (a) is a developed view, and (b) is a perspective view.

Fig. 7 is a perspective view of a conventional eraser.

Fig. 8 is a side view of a state in which the eraser of Fig. 7 is used for erasing characters, (a) shows a state where the edge of the rubber sheath is in contact with a bent rubber to generate cracks, (b) shows the expansion of cracks generated in (a), The state where the rubber is broken.

Fig. 9 is a perspective view showing a state where the rubber of Fig. 7 is broken.

FIG. 10 is a perspective view showing a state in which an eraser is accommodated in the rubber case disclosed in Patent Document 1. FIG.

Fig. 11 is a perspective view of a rubber boot according to another embodiment different from Figs. 1 and 6 .

Fig. 12 is a rubber cover according to another embodiment different from Fig. 1 , Fig. 6 , and Fig. 11 , (a) is a developed view, and (b) is a perspective view.

Symbol Description

1 rubber case (set of erasing eraser)

2 erasers (eraser eraser)

3a, 3c first cladding part

3b, 3d second cladding part

4.8 The protruding part of the rubber sleeve

5 ink application part (convex and convex)

6a～6d cutting line

7a opening

10, 12 short edge (set back)

Large area of 17a, 17b eraser

The middle area of 18a, 18b eraser

Front face of 19a eraser

19b eraser's rear end face

Detailed ways

Hereinafter, description will be made with reference to the drawings.

The rubber case 1 according to this embodiment accommodates a rectangular parallelepiped rubber 2 . As shown in Figure 3, the eraser 2 has a pair of large-area parts 17a, 17b with the largest area, a pair of middle-area parts 18a, 18b with an intermediate area, and a front end surface 19a and a rear end surface 19b (Figure 4) with the smallest area. ,Figure 5).

In addition, the eraser 2 to which the rubber case 1 is attached is generally sold on the market as an "eraser".

As shown in Fig. 1 and Fig. 2, rubber cover 1 (the cover of erasing character eraser) is the square tubular part of opening at both ends.

That is, a space 7 is formed inside the rubber boot 1 , and an opening 7 a is formed at one end (front end side) of the space 7 . The rubber cover 1 is formed of a paper sheet such as thick paper that is easily elastically deformed. The boot 1 has a main body region 3 and projections 4 , 8 in the longitudinal direction.

For convenience of description, with reference to the posture of FIG. 1 , the surface on the upper side of the rubber boot 1 is referred to as the front side, and the opposite side is referred to as the rear side. In addition, for convenience of description, the side where a part of the eraser 2 protrudes is called the front end side, and the opposite side is called the rear end side.

The rubber sheath 1 has a pair of opposing first covering portions 3a, 3c, and a pair of opposing second covering portions 3b, 3d. The rubber sheath 1 has an annular structure formed by connecting each first covering part 3a, 3c and each second covering part 3b, 3d, and is in the shape of a square tube. As shown in FIG. 3 , each first covering portion 3a, 3c covers a part (most part) of the large area portion 17a, 17b of the eraser 2, and each second covering portion 3b, 3d covers the middle area portion 18a, 17b of the eraser 2. Part (most) of 18b.

The first covering parts 3 a and 3 c constitute front and back surfaces (front and back) of the rubber case 1 , and the second covering parts 3 b and 3 d constitute side surfaces of the rubber case 1 .

As shown in FIG. 1 , protrusions 4 , 8 are provided on one end sides (front end side, opening 7 a side) of the first covering portions 3 a , 3 c of the rubber boot 1 , respectively. The protruding portions 4, 8 are formed so as to extend from the central portions of the first covering portions 3a, 3c.

The protruding portion 4 of the first covering portion 3 a on the surface side is on the opening 7 a side (tip side) of the main body region 3 , and is configured to extend the first covering portion 3 a of the main body region 3 . That is, the protruding portion 4 is a portion that extends the front end side of the first covering portion 3 a of the main body region 3 toward the front end, and constitutes the long edge 9 on one end side (the front end side) of the rubber boot 1 . In addition, the long edge 9 of the protruding part 4 is formed in a semicircular shape (arc shape) so that the central part of the first covering part 3a protrudes. That is, the long edge 9 of the protrusion 4 is arched.

An ink application portion 5 is provided on the outer surface of the protruding portion 4 . The ink application portion 5 is a portion where UV ink is applied by UV printing, and is a portion where protrusions are formed. In addition, the UV ink (ink) is an ultraviolet curable ink. Characters, patterns, and the like are three-dimensionally drawn on the ink application portion 5 , for example, to such an extent that they can be actually perceived by touch. That is, when the user holds the ink application unit 5 , large friction occurs between the rubber boot 1 and the user's fingers. In other words, the ink application portion 5 imparts unevenness to the surface of the rubber boot 1 to perform a non-slip function. Therefore, the finger of the user holding the rubber 2 (rubber case 1) is less likely to slip.

The protruding portion 8 is also provided on the first covering portion 3c on the back side. The protruding portion 8 on the back side has the same size and shape as the protruding portion 4 of the first covering portion 3 a on the front side, and is opposed to the protruding portion 4 on the front side. That is, the protruding portion 8 on the back side constitutes the same long edge 11 as the long edge 9 on the opening portion 7 a side on the front side. The long edge 11 on the rear side is also arched like the long edge 9 on the front side. Preferably, the same ink application portion as the ink application portion 5 of the front side protrusion 4 is provided on the outer surface of the rear side protrusion 8 .

As shown in FIG. 2 , linear long edges 13 , 15 are respectively provided in openings 7 b ( FIG. 2 ) on the other end side (rear end side) of the first covering portions 3 a , 3 c of the rubber boot 1 .

Further, linear short edges 14 , 16 are provided on the other end sides (rear end sides) of the second covering portions 3 b , 3 d , respectively. The short edges 14 , 16 are connected to the long edges 13 , 15 . That is, the opening 7b has a rectangular shape.

As shown in FIG. 1 , a short edge 10 (reset portion) is provided on the opening portion 7 a side (front end side) of the second covering portion 3 b. The short edge 10 is arched, and is a concave shape formed in such a way that it is connected to the long edges 9, 11 and the central part of the second covering portion 3b recedes toward the other end side (the rear end side, that is, the opening portion 7b side) of the main body portion 3. edge. Although not shown in figure, the short edge 12 similar to the short edge 10 of the 2nd covering part 3b is provided also in the one end side of the 2nd covering part 3d.

Cutting lines (cutting lines) 6 a to 6 d parallel to the opening 7 b (opening end) are provided in the main body 3 . The shear lines 6 a to 6 d are formed by breaking in the shape of holes, and are provided in an annular shape across the first covering parts 3 a and 3 c and the second covering parts 3 b and 3 d of the main body part 3 . The cutting lines 6 a to 6 d are provided at predetermined intervals (for example, 3 to 7 mm). In addition, the length from the opening part 7b of the main-body part 3 to the cutting line 6a is also the same distance.

As shown in FIG. 3 , a rectangular parallelepiped eraser 2 (character eraser) is accommodated inside the eraser case 1 having the above-mentioned structure.

The eraser 2 has a longitudinal corner portion 25 at the boundary between the large-area portion 17 a and the middle-area portion 18 a described above. Similarly, a longitudinal corner portion 26 is formed at the boundary between the large-area portion 17b and the middle-area portion 18a. In addition, there is a longitudinal corner portion 27 at the boundary between the large-area portion 17a and the middle-area portion 18b. In addition, there is a longitudinal corner portion 28 at the boundary between the large-area portion 17b and the middle-area portion 18b. However, the longitudinal corner portion 28 is not shown in the figure.

The cross section of the rubber 2 is roughly consistent with the rectangular cross section of the space 7 of the rubber sheath 1 . That is, the rubber 2 can be just inserted into the space 7 arranged in the rubber case 1 . As shown in FIG. 3 , the eraser 2 has long side corners 21 , 22 and short side corners 23 , 24 on the front end surface 19 a side.

In addition, the rubber 2 is slightly longer than the rubber case 1 (for example, about 3 to 7 mm). Therefore, if the rear end surface 19b of the eraser 2 is in a state consistent with the long edges 13, 15 and the short edges 14, 16 of the rubber case 1 shown in FIG. It protrudes slightly from the central part of the protruding parts 4 and 8 of the rubber sheath 1 . That is, the protruding parts 4, 8 (long edges 9, 11) are along the large-area parts 17a, 17b of the eraser 2, and the central part of the protruding parts 4, 8 (long edges 9, 11) and the front end surface 19a side of the eraser 2 The long side corners 21 and 22 are close to each other. Furthermore, the short edge 10 of the rubber sheath 1 is along the middle area portion 18a of the rubber 2 . The short edge 10 is formed in a concave shape so as to recede toward the short edge 14 side of the opening 7b. Not shown in the figure, but the short edge 12 of the rubber sheath 1 is also along the middle area portion 18b on the side opposite to the middle area portion 18a along which the short edge 10 is located. Long edges 9, 11 and short edges 10, 12 of protrusions 4, 8 are connected by connection parts 29a to 29d.

Next, the character erasing operation of the eraser 2 accommodated in the eraser case 1 will be described.

When erasing the characters and line drawings etc. drawn in the object 30 with the long side corners 21 of the eraser 2, the user holds the central part of the protruding parts 4, 8, as shown in Fig. 4(a) , make the long-side corner portion 21 abut against the character-erasing object 30, for example, make the eraser 2 reciprocate in the direction indicated by the arrow B1 to perform rubbing. In this case, the reciprocating direction of the eraser 2 (arrow B1 direction) coincides with the alignment direction of the user's fingers holding the eraser 2 (rubber case 1), so the user can easily apply force for erasing characters. That is, the protruding parts 4 and 8 are vertically oriented, and the user presses down the upper protruding part 4 or 8 with a finger to erase characters. Therefore, the user can easily apply force to the eraser 2 . Therefore, a large load is easily applied to the rubber 2, but the rubber 2 is difficult to break for the following reason.

That is, as shown in FIG. 3 , the central portions of the protruding portions 4 , 8 held by the user approach the long-side corner portions 21 , 22 of the eraser 2 by a relatively short distance L1 . In addition, the protruding parts 4 and 8 are arc-shaped, and the ends of the protruding parts 4 and 8 are connected to the short edges 10 and 12 by the connection parts 29 a to 29 d at positions retreated from the central part. Each connection part 29a-29d and the front-end surface part 19a are separated by distance L2. The distance L2 is considerably longer than the distance L1.

Furthermore, the user can easily grasp the central part of the protruding part 4, 8 due to the anti-slip function of the ink application part 5, and can hold a part very close to the long edges 9, 11 of the central part of the protruding part 4, 8. That is, the point of force (the part held by the user of the eraser 2 ) and the fulcrum (the part where the long edges 9 and 11 of the rubber sheath 1 of the eraser 2 abut) are substantially the same, and the distance between them is very short. Moreover, the distance L1 from a fulcrum to the long edge corner part 21 (action point) which abuts on the character erasing object 30 is also short. In addition, as shown in FIG. 3 , connecting portions 29 a to 29 d connecting both ends of the protruding portions 4 , 8 and the short edges 10 , 12 are located on the corners 25 , 26 , 27 , 28 of the eraser 2 in the longitudinal direction. The connecting portions 29 a to 29 d are located behind the central portion of the protruding portion 4 .

Eraser 2 moves back and forth along the direction of arrow B1 shown in Fig. 4 (a), even if long-side corner portion 21 rubs against object 30 to erase characters, eraser 2 is also clamped by the user's fingers to fix the central part of protrusions 4, 8 The eraser 2 can be bent only within the length of the distance from the long corners 21 of the eraser 2 to the center of the protrusions 4, 8 held by the user (approximately the distance L1 to the long edges 9, 11).

Furthermore, the protrusions 4, 8 (rubber cover 1) are made of a paper sheet such as thick paper that is easily elastically deformed together with the rubber 2, so the protrusions 4, 8 are pressed against the slightly curved rubber 2 to elastically deform. Therefore, it is difficult for the protruding parts 4, 8 (the long edges 9, 11) to be inserted (sinked) into the large-area parts 17a, 17b of the eraser 2 . Therefore, it is difficult for the eraser 2 to be cracked. That is, since the eraser 2 does not generate cracks that cause fracture, the eraser 2 does not break. In addition, the elastically deformable parts of the rubber 2 are reinforced by the protrusions 4 , 8 of the rubber case 1 .

In addition, the connection portions 29a-29d of the rubber sheath 1 that are in contact with the longitudinal corner portions 25-28 of the rubber 2 are located at a distance L2 from the long-side corner portions 21, 22 (front end portion 19a). Compared with the distance L1, The distance to L2 is quite long. Therefore, during the character erasing operation, the parts of the longitudinal corners 25, 26, 27, 28 of the eraser 2 that are in contact with the connecting parts 29a-29d are not elastically deformed (accurately, the amount of deformation is small).

Furthermore, the protruding parts 4 and 8 are arc-shaped, and the ends of the protruding parts 4 and 8 are smoothly connected by the short edges 10 and 12 and the connecting parts 29a to 29d at a position behind the central part of the protruding parts 4 and 8 . Therefore, the longitudinal corners 25 to 28 of the rubber 2 are less likely to be pressed by the rubber case 1 , and the connecting parts 29 a to 29 d are not inserted into the longitudinal corners 25 , 26 , 27 , and 28 . This makes it difficult for the eraser 2 to crack.

In addition, when the eraser 2 is reciprocated in the arrow B2 direction ( FIG. 4( b )) perpendicular to the arrow B1 ( FIG. 4( a )), the arrow B2 direction coincides with the direction in which the long-side corners 21 extend. Therefore, It is possible to perform character erasing only in a specific narrow area of the character erasure object 30 . In this case, the user pays attention to whether or not the long-side corners 21 of the eraser 2 are in contact with the part to be erased, so the user does not apply too much force. Therefore, a large load is not applied to the eraser 2, and the eraser 2 is hardly damaged.

In addition, when reciprocating in the arrow B2 direction, the eraser 2 bends (elastically deforms) in the direction in which the long-side corners 21 extend. That is, the eraser 2 is bent such that the long-side corners 21 move toward the middle area 18 a side or the middle area 18 b side.

However, compared with the distance L3 ( FIG. 3 ) from the central portion of the protruding portions 4 and 8 as the point of force to the short-side corner portion 24 as the point of action, the distance from the long-side corner portion 21 (front end portion 19 a ) to the rubber sheath 1 The distance L2 (FIG. 3) of the connecting portions 29a to 29d is considerably long. That is, when clamping the central part of the protrusions 4, 8, with respect to the short side corners 24, the clamped position is located on the front side than the short edge 10, so that the middle area part 18a of the eraser 2 is in contact with the eraser. The portion where the short edge 10 of the sleeve 1 contacts is not bent. Therefore, the portion of the middle area portion 18a that is in contact with the short edge 10 is not pressed, and the short edge 10 is not inserted into the middle area portion 18a, so no cracks are generated in the middle area portion 18a. Cracks do not occur in the middle area portion 18b (the surface opposite to the middle area portion 18a ) of the eraser 2 for the same reason.

In addition, when using the long-side corner portion 21 to reciprocate in the direction of the arrow B2, it is difficult for the user to hold the protruding portions 4 and 8 to perform the character erasing operation. That is, the direction in which the user's fingers are arranged is perpendicular to the arrow B2 direction (reciprocating movement direction), and therefore it is difficult for the user to apply force to the eraser 2 . Therefore, in this case, it is easier to perform the character erasing operation by clamping the second covering parts 3b, 3d of the rubber sheath 1 . In this case, the user pays attention to whether the long edge corner portion 21 of the eraser 2 is in contact with the part to be erased, so there will be no greater force acting on the eraser 2, and the eraser 2 will not break.

Next, a case where characters are erased using the short corners 24 of the eraser 2 will be described.

As shown in Figure 5 (a), when making the short edge corner portion 24 abut against the object 30 to erase characters and making the eraser 2 move back and forth along the direction shown by the arrow C1, the eraser 2 moves toward the middle area portion with the short edge corner portion 24. The 18a side or the front end surface 19a side is bent (elastically deformed) so as to move. However, the central part of the protruding parts 4, 8 of the rubber 2 is clamped, so as mentioned above, the short edge 10 of the rubber case 1 will not be pressed against the middle area portion 18a, and the short edge 10 will not be inserted into the middle area portion 18a. Cracks do not occur in the middle area portion 18a.

In addition, when the short-side corners 24 are brought into contact with the character-erasing object 30 and the eraser 2 is reciprocated in the direction indicated by the arrow C1, characters can be erased within the width of the short-side corners 24 . Here, when the user holds the protrusions 4, 8, the direction in which the fingers of the user holding the eraser 2 are aligned is the direction perpendicular to the arrow C1 (the direction perpendicular to the paper surface in FIG. 5(a) ). Therefore, The user needs to clamp the eraser 2 with a relatively large force. That is, it is considered that it is difficult for the user to perform the character erasing operation, and it is seldom to apply a large force to the eraser 2 to perform the character erasing operation. Accordingly, a large load is not applied to the eraser 2, and the eraser 2 does not break.

In addition, as shown in FIG. 5(b), when the eraser 2 is reciprocated in the direction shown by the arrow C2, the arrow C2 direction is consistent with the arrangement direction of the user's fingers holding the eraser 2, so the user can easily apply force. Do wiping work. Therefore, a large load is applied to the eraser 2 .

However, since the protrusions 4, 8 are arc-shaped, there are no corners on the arc-shaped long edges 9, 11, and the connection portions 29a-29d with the short edges 10, 12 are at a distance L2 from the front end surface 19a. That is, each connecting portion 29a-29d is in contact with the longitudinal corner portions 25-28 of the eraser 2, and the distance between the connecting portions 29a-29d from the front end surface portion 19a is a distance L2 longer than the distance L1. Therefore, the longitudinal corner portion 25 ~28 is not easy to produce cracks.

Since the rubber cover 1 is made of an elastic material, when the rubber cover 1 is bent and the rubber cover 1 is pressed, the rubber cover 1 is easily elastically deformed, and the long edges 9, 11 of the protrusions 4, 8 are difficult to insert into the large-area portion 17a of the rubber 2. , 17b, and each middle area portion 18a, 18b. Therefore, the large-area portions 17a, 17b and the respective middle-area portions 18a, 18b are less likely to be cracked, and the eraser 2 is less likely to be broken.

In addition, the eraser 2 itself gradually decreases as it is used, and its length becomes shorter. Therefore, according to the length of the rubber 2, the cutting lines 6a to 6d of the rubber case 1 are cut. The rubber case 1 does not use high-quality materials, but paper sheets such as thick paper, so there is no harm in discarding them.

In addition, as the eraser 2 is used, the long-side corners 21 and 22 and the short-side corners 23 and 24 on the front end surface 19 a side are eliminated, and the eraser 2 becomes curved. Even in this case, the eraser 2 basically passes through arrows B1, B2, C1, and C2 shown in Fig. 4(a), Fig. 4(b), Fig. 5(a), and Fig. 5(b). The reciprocating movement in any direction or the reciprocating movement in a direction oblique to these reciprocating directions erases characters, line drawings, etc. displayed on the object to be erased 30 . At this time, the large-area portions 17a, 17b of the eraser 2 are also sandwiched by the protruding portions 4, 8, any large-area portions 17a, 17b of the eraser 2, and each middle area portion 18a, 18b, and the longitudinal corners 25-25. 28 did not produce cracks.

In addition, when the short edges 10 and 12 on one side (front end side) of the rubber sheath 1 are arcuate in such a way that they recede toward the other side (rear end side) of the rubber sheath 1, no large force acts locally. In the middle area portions 18a, 18b of the eraser 2, the eraser 2 is less likely to be cracked.

In addition, the top 20a where the long-side corners 21, short-side corners 24, and longitudinal corners 26 of the eraser 2 shown in FIG. In this case, by sandwiching the central portions of the protruding portions 4 and 8 of the rubber sheath 1, the eraser 2 can erase characters without cracks in the large-area portions, each middle-area portion, and each longitudinal corner portion. The same applies to the other tops 20b to 20d of the eraser 2 .

In this embodiment, the ink application part 5 is provided on the protruding part 4, and if an interesting character sequence or pattern is drawn on the ink application part 5, the user can use the eraser 2 happily. For example, when drawing a cartoon character or the like, even younger people will be interested in the protruding part 4 and can correctly hold the protruding parts 4 and 8 to erase characters.

Here, instead of providing the ink application portion 5 by UV printing on the outer surface of the protrusion 4 , it is also possible to form irregularities on the surface of the protrusion 4 by attaching another member, or to partially cut off the surface of the protrusion 4 . Concave-convex on the outer surface.

Next, a rubber boot 31 according to another embodiment will be described with reference to FIG. 6( a ) and FIG. 6( b ). The boot 31 has substantially the same structure as the boot 1 shown in FIG. 1 .

As shown in FIGS. 6( a ) and 6 ( b ), the rubber boot 31 has a main body region 33 and protrusions 34 , 38 . The main body region 33 has a pair of opposing first covering portions 33a, 33c and a pair of opposing second covering portions 33b, 33d. Furthermore, the main body region 33 has a repeating portion 32 . As shown in FIG. 6( a ), the overlapping portion 32 is connected to the second covering portion 33d. Bending portions 45a, 45b are provided at boundaries between the first covering portions 33a, 33c and the second covering portion 33b. In addition, bending portions 45 c and 45 d are respectively provided between the second covering portion 33 d and the first covering portion 33 c and between the second covering portion 33 d and the overlapping portion 32 .

Cutting lines 36 a to 36 d are provided in order from the side of the opening 37 b in the main body region 33 . The shear lines 36a to 36d are formed by breaking in the shape of linear perforations.

The main body region 33 has a ring structure formed by connecting the first covering part 33a, the second covering part 33b, the first covering part 33c, and the second covering part 33d, and is in the shape of a square tube. That is, the main body region 33 is bent along the bending parts 45a-45d, not shown in the figure, but the overlapping part 32 is overlapped and bonded with the first covering part 33a, and the rubber sheath 31 is in the shape of a square tube.

Since the main body region 33 is formed in a square tube shape, the cutting lines 36a to 36d are connected in a ring shape.

A space 37 is formed inside the square tube, and both sides of the space 37 are opened to form openings 37a, 37b.

In addition, slits (slits) 46a to 46c are provided in the first covering portion 33a. The slits 46a to 46c are alternately provided in parallel to the cutting lines 36a to 36d, and the length is approximately half of the width of the first coating portion 33a. Similarly, slits 47a to 47c are also provided in the first covering portion 33c.

Protruding portions 34 , 38 are provided on one end sides (opening portion 37 a side) of the first covering portions 33 a , 33 c of the main body region 33 , respectively. The protruding portion 34 has an arc shape such that the central portion of the first covering portion 33 a protrudes, and has a long edge 39 . The protruding portion 38 is also arc-shaped like the protruding portion 34 and has a long edge 41 . The protruding amounts of the protruding portions 34 and 38 are smaller than the protruding amounts of the protruding portions 4 and 8 of the rubber boot 1 in FIG. 1 .

That is, as shown in FIG. 1 , the protrusions 4 and 8 of the rubber sheath 1 protrude approximately in a semicircular shape, but the protrusions 34 and 38 of the rubber sheath 31 are circular as shown in FIGS. 6( a ) and 6 ( b ). Arc protruding.

Further, the long edge 41 constituted by the protruding portions 34, 38 is in an arched shape continuous from one end to the other end over the entire width of the first covering portion 33a, 33b. That is, the long edge 39 has an arc shape, and one end of the arc is positioned on the boundary formed by the first covering portions 33a, 33c and the second covering portions 33b, 33d. In other words, the long edge 39 is a circular arc having a boundary line between the first covering portion 33a and the second covering portion 33b as one end and a boundary line between the first covering portion 33a and the second covering portion 33d as the other end.

In addition, ink application parts 35 a and 35 b are provided on the outer surfaces of the protruding parts 34 and 38 . Concaveities and convexities are formed on the protruding portions 34, 38 by the ink application portions 35a, 35b.

On the other hand, recessed parts 43 and 44 are provided on one end sides (opening part 37a side) of the pair of second covering parts 33b and 33d, respectively. The concave parts 43, 44 constitute the short edges 40, 42 on the one end side of the second covering parts 33b, 33d. The central parts of the recessed parts 43, 44 retreat toward the opening part 37b side, and the short edges 40, 42 have a smooth concave arc shape.

As shown in FIG. 6( a ) and FIG. 6( b ), the long edge 39 , the short edge 40 , the long edge 41 , and the short edge 42 are connected so as to draw a smooth concave-convex curve. That is, each edge 39, 40, 41, 42 is arcuate in shape. Therefore, as shown in FIG. 6( b ), the opening 37 a of the rubber sheath 31 forms four arch-shaped openings connected together. Therefore, it is difficult to apply a large force locally during the character erasing operation, and it is difficult for the eraser to crack.

In addition, the rubber cover 1 shown in FIG. 1 may be configured like the rubber cover 51 shown in FIG. 11 . The outer shape of the rubber boot 51 shown in FIG. 11 is substantially the same as the outer shape of the rubber boot 1 shown in FIG. 1 , except that the protruding portion 8 does not have the ink application portion 5 (concave-convex). Also in the rubber case 51, the user can hold the protruding parts 4 and 8 and perform the character erasing work well. In addition, it is difficult to locally apply a load to the rubber (not shown), and it is difficult for the rubber to crack.

Furthermore, the rubber sheath 31 shown in FIG. 6( a ) and FIG. 6( b ) can also be configured like the rubber sheath 52 shown in FIG. 12( a ) and FIG. 12( b ). The outer shape of the rubber sheath 52 is substantially the same as that of the rubber sheath 31, except that the protrusions 34, 38 do not have the ink application portions 35a, 35b. Also in the rubber case 52, the user can hold the protruding parts 34 and 38 and perform the character erasing work well. In addition, it is difficult to locally apply a load to the rubber (not shown), and the rubber is unlikely to be cracked.

Claims (11)

1. A rubber sheath, which is in the shape of a square tube, has an opening at least on one end side, is installed on the rubber to cover a part of the rubber, and makes a part of the rubber protrude from the opening, and the rubber is approximately cuboid, It has two large-area parts with the largest areas, front and rear-end faces with the smallest areas, and two middle-area parts with medium areas. The rubber sheath is characterized by: having a pair of first covering portions covering a part of the large-area portion of the eraser and a second covering portion covering a part of the middle-area portion of the eraser, A protruding portion is provided at the end of the first covering portion on the one end side of the rubber sheath, The protruding portion protrudes in an arc shape and follows the surface of the rubber, The protrusion can be elastically deformed together with the rubber. 2. The rubber sheath according to claim 1, characterized in that: Concavities and convexities are provided on the outer surface of the protrusion. 3. The rubber sheath according to claim 2, characterized in that: The unevenness is three-dimensionally formed by UV ink applied to the surface of the protrusion. 4. The rubber sheath according to claim 1, characterized in that: The second covering portion on the one end side of the rubber boot is provided with an arc-shaped receding portion receding toward the other end side of the boot. 5. The rubber sheath according to claim 1, characterized in that: A plurality of annular shearing lines are provided at predetermined intervals across the pair of first covering portions and the pair of second covering portions. 6. The rubber sheath according to claim 1, characterized in that: It consists of thick paper. 7. The rubber sheath according to claim 1, characterized in that: The side constituted by the protruding portion is an arch shape formed continuously from one end to the other end over the entire width of the first covering portion. 8. A rubber case, which is in the shape of a square tube, has an opening at least on one end side, is installed on the rubber to cover a part of the rubber, and makes a part of the rubber protrude from the opening, and the rubber is approximately cuboid, It has two large-area parts with the largest areas, front and rear-end faces with the smallest areas, and two middle-area parts with medium areas. The rubber sheath is characterized by: a pair of first covering parts covering a part of the large-area part of the eraser and a second covering part covering a part of the middle-area part of the eraser, the first covering part and the second covering part Made of thick paper, a protruding part is provided at the end of the first covering part on the one end side of the rubber sheath, and the protruding part protrudes in an arc shape and follows the surface of the rubber, and the protruding part It can be elastically deformed together with the rubber, and the outer surface of the protruding part is formed with unevenness with UV ink, and the second covering part is provided with an arc-shaped receding part that recedes toward the other end side of the rubber sheath. The protruding portion of the first covering portion is smoothly connected to the concave portion of the second covering portion, and a pair of first covering portions and a A plurality of annular cutouts to the second cladding. 9. A rubber case, which is in the shape of a square tube, has an opening at least on one end side, is installed on the rubber to cover a part of the rubber, and makes a part of the rubber protrude from the opening, and the rubber is approximately cuboid, It has two large-area parts with the largest areas, front and rear-end faces with the smallest areas, and two middle-area parts with medium areas. The rubber sheath is characterized by: a pair of first covering parts covering a part of the large-area part of the eraser and a second covering part covering a part of the middle-area part of the eraser, the first covering part and the second covering part Made of thick paper, a protruding part is provided at the end of the first covering part on the one end side of the rubber sheath, and the side formed by the protruding part is from one end to the other end of the entire width of the first covering part A continuously formed arch, the protruding portion is along the surface of the rubber, the protruding portion can be elastically deformed together with the rubber, concavities and convexities are formed on the outer surface of the protruding portion, and the second covering The portion is provided with an arc-shaped receding portion that recedes toward the other end side of the rubber sheath, and the protruding portion of the first covering portion is smoothly connected to the concave portion of the second covering portion. 10. The rubber sheath according to claim 9, characterized in that: A plurality of annular shearing lines are provided at predetermined intervals across the pair of first covering portions and the pair of second covering portions. 11. An eraser, characterized in that: The rubber sheath described in any one of claims 1-10 is installed.