JP2014043005A - Eraser for board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an eraser for a board, which does not have problems related to ink erasability or writability after erasure.SOLUTION: An erasing member is formed by an elastic body having a water holding property, and a blade made of an elastic body having higher rigidity than the erasing member projects by a prescribed amount from an erasing road surface of the erasing member and is disposed so as to extend along an erasing surface. Ink on a board surface can be reliably erased, as water is contained in the erasing member and the water exudes from the erasing surface when wiping off the board surface with the erasing member to enable water wiping of the board surface. In the erasing operation, the water is exuded from the erasing surface on a front side of the blade, the exuded water is dammed by the blade, the water dammed up by the blade can be returned to the erasing member, and because the board surface is drained by the blade, water due to the water wiping does not remain at an ink-erased portion on the board surface, thereby a marker pen can be used to start writing directly.

Description

  The present invention relates to an eraser for erasing characters and lines written on a board or the like, and more particularly to a board eraser suitable for a white board also serving as a projection screen.

  Conventionally, among what are called electronic blackboards, for example, a whiteboard can be used as a projection screen. In such an electronic blackboard, in order to improve the screen projectability (screen gain / viewing angle characteristics), it is better to make the board surface rough to some extent. However, if the board surface is uneven, it will be written with a marker pen. It becomes difficult to completely erase the ink adhering to the board surface by wiping with an eraser. In order to improve ink erasability, it is preferable to increase the smoothness of the board surface, but there arises a problem that the antiglare property at the time of projection decreases. Such conflicting problems are difficult to solve simply by improving the board surface.

  On the other hand, it is known that ink written on an uneven board surface can be surely erased by wiping with water. For example, as an eraser for erasing ink on a white board, a coating body having a water storage part storing water and a coating surface for leaching the water is provided, and a wiping body having a drying surface for wiping water is provided in parallel. (See, for example, Patent Document 1). In addition, there is a liquid storage sponge infiltrated with cleaning liquid in the case, an eraser sponge is laminated on the liquid storage sponge through a water permeable film, and the surface that is slidably contacted with the board surface is covered with felt. Yes (see, for example, Patent Document 2).

JP-A-6-336099 Japanese Utility Model Publication No. 62-138096

  According to the eraser for boards that enables wiping as described above, the ink on the board surface can be erased by the wiping effect, but when the board surface is wet, it is not possible to start writing with a marker pen immediately. There is a problem. In the above-mentioned Patent Document 1, the dry surface of the wiping body and the application surface of the application body are located on the same plane, and water that has exuded from the application surface is wiped off by the dry surface. However, if the dry surface does not dry out, the water adhering to the board surface cannot be sufficiently wiped off, and if moisture remains on the board surface, there is a problem that it is impossible to write with a marker pen immediately. Further, in the above-mentioned Patent Document 2, the board surface is wiped with the felt wetted through the eraser sponge, and only the ink erasability is ensured by wiping. Similarly, there is a problem that it is impossible to write with a marker pen immediately because moisture remains.

  The present invention has been devised to solve such problems of the prior art, and its main purpose is to ensure ink erasability on the board surface with anti-glare and writing properties and An object of the present invention is to provide a board eraser that can immediately start writing with a marker pen on an erased portion.

  The board eraser of the present invention is a board eraser for erasing characters or figures written in ink on the board surface, and has a wiping surface that can be brought into sliding contact with the board surface, and the wiping member The wiping member is made of an elastic body having water retention, and the blade is made of an elastic body having higher rigidity than the wiping member, and protrudes a predetermined amount from the wiping surface. And

  According to the present invention, since a blade made of an elastic body having higher rigidity than the wiping member is attached to the wiping member made of an elastic body having water retention so as to protrude a predetermined amount from the wiping surface, the wiping member contains water. If the board surface is wiped off with the wiping member, water can ooze out from the wiping surface and the board surface can be wiped off, so that the ink on the board surface can be surely erased. By providing the blade so as to be posterior to the wiping direction and perpendicular to the wiping direction, in the wiping operation, water can be oozed out from the wiping surface on the front side of the blade, and the oozed water can be dammed up by the blade. As a result, the water blocked by the blade can be returned to the wiping member, and the board surface is drained by the blade, so that the water from the wiped surface does not remain on the portion of the board surface where the ink has been erased, and the marker pen is immediately You can start writing at.

1 is a schematic configuration diagram of a whiteboard device according to an embodiment of the present invention. (A) is a perspective view showing the whole eraser with the wiping surface side up, (b) is a perspective view showing the whole eraser with the wiping surface side down. (A) is sectional drawing seen along the IIIa-IIIa line | wire of FIG.2 (b), (b) is a figure corresponding to (a) which shows the upper rank which pushed the top-plate part. The main part disassembled perspective view showing the entire eraser with the wiping surface side up Diagram showing eraser wiping instructions (A) is the principal part expanded sectional view of the braid | blade vicinity which shows a water wiping state, (b) is the principal part expanded sectional view of the center part which shows a water wiping state. Table showing erasability and writability when each dimension of the main part of the eraser is changed Perspective view showing eraser wiping procedure when erasing a narrow area (A) is an enlarged cross-sectional view showing a second example of the blade cross-sectional shape, (b) is an enlarged cross-sectional view showing a third example of the blade cross-sectional shape, and (c) is another diagram in the first example of the blade cross-sectional shape. Diagram showing shape The figure corresponding to Drawing 3 (a) showing a 2nd embodiment of an eraser

  1st invention made | formed in order to solve the said subject is an eraser for boards for erasing the character, figure, etc. which were written with the ink on the board surface, Comprising: It has the wiping surface which can be slidably contacted to the said board surface A wiping member; and a blade attached to the wiping member, wherein the wiping member is made of an elastic body having water retention, and the blade is made of an elastic body having higher rigidity than the wiping member, and the wiping surface It is set as the structure which protrudes predetermined amount from.

  According to this, since a blade made of an elastic body having higher rigidity than the wiping member is attached to the wiping member made of an elastic body having water retention so as to protrude a predetermined amount from the wiping surface, water is included in the wiping member. When the board surface is wiped off with the wiping member, water oozes out from the wiping surface and the board surface can be wiped off, so that the ink on the board surface can be surely erased. By providing the blade so as to be posterior to the wiping direction and perpendicular to the wiping direction, in the wiping operation, water can be oozed out from the wiping surface on the front side of the blade, and the oozed water can be dammed up by the blade. As a result, the water blocked by the blade can be returned to the wiping member, and the board surface is drained by the blade, so that the water from the wiped surface does not remain on the portion of the board surface where the ink has been erased, and the marker pen is immediately You can start writing at.

  Moreover, 2nd invention is set as the structure provided in the position which bisects the said wiping surface in the said 1st invention.

  According to this, simply by making the wiping direction perpendicular to the blade, the board surface is wiped with either side divided by the blade of the wiping surface in front of the wiping direction, and then drained by the following blade. can do.

  According to a third aspect of the present invention, in the second aspect of the present invention, the wiping surface is formed by two inclined surfaces that are bent with the position where the blade is provided as a top.

  According to this, the wiping surface is formed by two inclined surfaces inclined from the blade extending to the top of the bent cross-sectional shape toward both ends, and the wiping is performed so that one of the inclined surfaces is in sliding contact with the board surface. Then, the other slope slopes away from the board surface, so by setting the bending angle of the bent part to a larger angle than the specified angle, the slope that does not slide on the board surface can be kept sufficiently away from the board surface. And the board surface after wiping can be prevented from coming into contact with the other slope and getting wet.

  Moreover, 4th invention is provided with the auxiliary | assistant blade extended in the direction which cross | intersects the said blade in the said wiping surface in the said wiping surface in either said 2nd or 3rd invention. The configuration.

  According to this, for example, using a wiping member having a rectangular contact surface edge, the blade is provided so as to extend in the longitudinal direction of the wiping surface, and each auxiliary blade is provided at each end of the blade and orthogonal to the blade. When wiping in the direction orthogonal to the blade, when wiping by sliding one of the pair of wiping surfaces against the board surface, the entire wiping surface can be used to wipe a wide area, and the auxiliary blade When wiping in a direction perpendicular to the wiping area, a portion close to the auxiliary blade on the wiping surface can be slid to wipe a narrow area.

  Moreover, 5th invention sets it as the structure by which the said wiping surface is formed of the cloth-like member which has the water permeability provided in the surface of the said wiping member in any one of the said 1st thru | or 4th invention. .

  According to this, water retention is ensured by the wiping member, and by appropriately changing the material of the cloth-like member provided on the surface of the wiping member, the water permeability can be adjusted, so that an appropriate amount of water is absorbed when wiping. Can be issued. In addition, it is not necessary to consider wear resistance for the material of the wiping member, and a material mainly composed of water retention can be selected, and a wide selection of materials is possible.

  According to a sixth invention, in any one of the first to fifth inventions, the wiping member is supported by a gripping member for gripping by hand, and the gripping member supplies water to the wiping member. The water tank that stores water is built in.

  According to this, the eraser is provided with a gripping member that can be gripped by hand, and by providing a water tank in the gripping member, an appropriate amount of water can be supplied from the water tank to the wiping member each time it is used. By supplying an appropriate amount of water from the water tank to the wiping member at the time of use, good ink erasing can always be performed by wiping with water.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of a whiteboard device according to an embodiment of the present invention. The whiteboard device main body 1 has a board surface 2 that is also used as a projection screen. The board surface 2 has an appropriateness as a projector screen for projecting a projected image from the projector device 4 connected to the personal computer 3 or the like, and has an appropriateness for erasing writing using the whiteboard marker pen 5 and the eraser 6. .

  The surface of the board surface 2 may have sufficient light diffuse reflectance as a projection screen for the projector device 4 having increased brightness in recent years. For example, the surface of the board surface 2 may have an appropriate surface roughness due to an uneven shape. This surface roughness is also effective for adhesion of marker ink when writing with the marker pen 5.

  On the other hand, for the erasability of the marker ink adhering to the board surface 2, the roughness due to the irregularities of the board surface 2 is difficult to erase. The eraser 6 according to the present invention, which corresponds to such a rough surface due to unevenness and has good writing properties immediately after erasure, will be described below.

  FIG. 2 is a perspective view showing the entire eraser 6, FIG. 2 (a) shows a state where the wiping surface side is up, and FIG. 2 (b) shows a state where the wiping surface side is down. The eraser 6 includes a body 7 as a gripping member on the lower side in FIG. 2A, a support member 8 integrally provided on the upper side of the body 7, and a support member 8 so as to cover the entire upper surface side of the body 7. And a wiping member 9 made of a sponge as a supported elastic body having water retention. The overall size of the eraser 6 may be similar to that of a known whiteboard eraser that is commercially available.

  The wiping member 9 may be a soft sponge material, has a rectangular outer shape in plan view, and is formed into a gable roof shape having a bent cross-sectional shape when viewed from the longitudinal direction, and two inclined surfaces that are inclined to each other The wiping surfaces 9a and 9b are made of. Examples of the soft sponge material include PVA, urethane, EVA, and polyester. In addition, each edge part of the both sides opposite to the top part of a pair of wiping surface 9a * 9b which each inclines on both sides from the top part of the bending cross-sectional shape of the wiping member 9 is chamfered.

  At the top of the pair of wiping surfaces 9a and 9b, a square bar-like blade 11 is disposed over the entire length of the eraser 6 in the longitudinal direction. The blade 11 is made of a non-water-absorbing elastomer such as rubber as an elastic body having flexibility but higher rigidity than the wiping member 9, and has a rectangular cross section as shown in FIG. And it adheres to the top part of the gable roof shape between a pair of wiping surfaces 9a and 9b by adhesion, for example. Further, rod-shaped auxiliary blades 12 that are bent and extend along the respective edges are provided in the vicinity of the respective bent-shaped edges that are both ends in the longitudinal direction of the wiping surfaces 9a and 9b. Each auxiliary blade 12 is provided so that bent portions are connected to both ends of the blade 11 and extend orthogonally to the blade 11. The material and cross-sectional shape of each auxiliary blade 12 may be the same as the blade 11. In the illustrated example, each auxiliary blade 12 is provided with a length from a straight top portion between the pair of bent wiping surfaces 9a and 9b to the vicinity of each edge parallel to the top portion. These blades 11 and 12 have a draining action like a wiper blade.

  Further, a water tank 13 is provided inside the body 7 as shown by a broken line in FIG. For example, the body 7 is formed in a hollow shape by a synthetic resin material, and the entire body 7 is formed as the water tank 13.

  In the central portion of the top plate 7a of the body 7 on the upper side in FIG. 3 (b), an opening 14 for introducing water into the water tank 13 is provided, and a plug 15 is attached to the opening 14. . The top plate 7a is formed to be thinner than the bottom wall 7b and the peripheral wall 7c that form the water tank 13 as shown in FIG. As shown in FIG. 4, the bottom wall 7 b is provided with a plurality of water supply channels 16 at positions corresponding to the tops of the gable roof shape of the wiping member 9. A reed valve type elastic plate-like valve element 17 is provided at the outlet of the water supply passage 16 on the wiping member 9 side. The plug 15 is provided with a one-way valve (not shown) that can take outside air into the water tank 13.

  Further, as shown in FIG. 4, triangular support members 8 are erected on the outer portion of the bottom wall 7 b of the body 7 so as to face each other at both ends in the longitudinal direction. A bent cross-sectional shape is formed on the upper edges of the support members 8, both longitudinal edges between the support members 8 of the bottom wall 7 b, and a reinforcing beam (not shown) passed between the support members 8. The four sides of the wiping member 9 are fixed by adhesion, for example. Thereby, the space enclosed by the bottom wall 7b, both the supporting members 8, and the wiping member 9 is sealed.

  A procedure for erasing the marker ink on the board surface 2 by the eraser 6 thus formed will be described below.

  First, an appropriate amount of water is stored in the water tank 13 in advance. In order to add water, the stopper 14 is once removed, water is put into the water tank 13 through the opening 16, the stopper 14 is returned, and the opening 16 is closed. When the wiping member 9 (wiping surfaces 9a and 9b) is dry when the marker ink on the board surface 2 is erased, the top plate 7a is pushed in an appropriate amount as shown by the arrow A in FIG. . As a result, pressure is applied to the water in the water tank 13 to open the valve body 17, and the water in the water tank 13 flows out toward the wiping member 9 as indicated by the broken line arrow in FIG. . The water that has flowed out penetrates the wiping member 9 and is retained in the wiping member 9.

  When wiping the board surface 2, as shown in FIG. 5, one of the pair of wiping surfaces 9a and 9b (9a) forming both slopes of the gable roof shape is brought into sliding contact with the board surface 2. The eraser 6 is moved in the direction indicated by the arrow B in the figure. At this time, a part of the water contained in the wiping member 9 oozes out from the preceding edge portion of the wiping surface 9a slidably contacted with the board surface 2 as shown by the arrow D in FIG. The board surface 2 becomes wet with water W.

  6A shows a state in which only the edge portion preceding the wiping direction of the wiping surface 9a is in sliding contact with the board surface 2, the central portion other than the vicinity of the blade 11 and the auxiliary blade 12 is shown in FIG. As shown in FIG. 6B, the wiping member 9 can come into contact with the board surface 2 by elastic deformation. As a result, the water W that has flowed out to the board surface 2 can be used to wipe the board surface 2 with the central portion of the wiping surface 9a, and the marker ink INK can be reliably erased.

  The water W that has oozed out from the preceding edge portion of the wiping surface 9a that is in sliding contact with the board surface 2 adheres to the board surface 2 and moves toward the blade 11 relatively by the movement of the eraser 6. 11 to stop it. The side surfaces facing the wiping surfaces 9a and 9b of the blade 11 having a rectangular cross-sectional shape are inclined rearward with respect to the wiping surfaces 9a and 9b, respectively. As shown in FIG. ) Side edge 11a is in sliding contact with the board surface 2. As a result, the edge 11 a makes line contact with the board surface 2, the edge 11 a is elastically deformed according to the unevenness of the board surface 2, and unwiping of the water W by the blade 11 is suppressed. The water W blocked by the blade 11 with the movement of the eraser 6 can be absorbed by the wiping member 9 in the vicinity of the blade 11 and returned to the wiping member 9 as indicated by an arrow E in the figure. Since the auxiliary blades 12 extending orthogonally at both ends of the blade 11 are prevented from flowing out to the outside of the side of the eraser 6, the water W is removed when the vertical board surface 2 is wiped. It is possible to prevent dripping of the liquid dripping on the surface 2.

  In this way, the board surface 2 can be wiped with water when the wiping surface 9a is brought into sliding contact with the board surface 2 and the marker ink INK on the board surface 2 is wiped off. In erasing the marker ink written on the white board, the water wiping effect is great, and the marker ink INK on the board surface 2 can be erased reliably. Further, since one of the pair of wiping surfaces 9a and 9b composed of both slopes of the gable roof shape is wiped, the other wiping is performed as shown by a two-dot chain line in FIG. The surface 9b can be brought into contact with the board surface 2 and wiped in the direction indicated by the arrow C in a direction opposite to the arrow B. Thereby, for example, what is written in a plurality of lines can be sequentially erased while the eraser 6 reciprocates.

  As described above, the water W remaining on the board surface 2 by wiping the eraser 6 is surely drained by the blade 11 along with the movement of the eraser 6, and thus on the board surface 2 after the blade 11 has moved. Does not remain. Accordingly, the board surface 2 remains in a dry state without water remaining despite being wiped with water, and can respond to writing of characters, lines and the like with the marker pen 5 immediately after without any problems. In addition, since the water W is collected by the blade 11 and returned to the wiping member 9, the wet state of the wiping member 9 can be maintained for a long period of time, and water is supplied from the water tank 13 each time the eraser 6 is used. There is no need.

  The marker ink INK moves to the wiping surfaces 9a and 9b by wiping, but the marker ink INK can be removed from the wiping surfaces 9a and 9b by washing the wiping surfaces 9a and 9b with water, for example. Furthermore, even if a part of the marker ink INK soaks into the wiping member 9, the marker ink INK can be easily washed out by washing with the wiping member 9 containing water, and is always refreshed. The state eraser 6 can be used.

  In addition, since water is stored in the water tank 13 and supplied to the wiping member 9 as necessary, for example, a separate water tank is prepared, and a compact structure is used for wiping the eraser in the water tank. It is. Further, since the eraser 6 can be handled as a single unit, it is easy to store.

  FIG. 7 is a table showing the results of examining the erasability and the writing property when the dimensions of the main part of the eraser 6 according to the present invention are changed. As shown in the table of FIG. 7, the dimensions are changed in a state where the thickness of the wiping member 9 (s in FIG. 6) and the wiping surface 9 a on the wiping side are in surface contact with the board surface 2. The opening angle (eraser inclination; θ in FIG. 6) of the wiping surface 9b on the rear side in the wiping direction to be contacted and the height from the wiping surfaces 9a and 9b of the blade 11 (b in FIG. 6). Moreover, it divided into 9 samples (No. 1-9) according to those differences, and investigated. The area to be erased has a width in the longitudinal direction of the eraser 6 that is vertical, a distance that can be wiped by a single wiping operation by the eraser 6 is horizontal, and a rectangular area that is readable by the marker pen 5 is large. The characters were written side by side and erased by one wiping operation in one direction.

  First, all sample Nos. In 1 to 9, erasure due to the water wiping effect was confirmed.

  Sample No. 1, the thickness s of the wiping member 9 was 1 mm. In this case, the effect of water wiping was obtained only in about half of the area to be wiped. Sample No. 2, sample no. 1, the thickness s of the wiping member 9 was 2 mm. In this case, the marker ink could be erased by the water wiping effect with a single wiping operation on the entire surface of the wiping target area. Thereby, it was confirmed that the thickness s of the wiping member 9 should be at least 2 mm.

  However, the above sample no. In No. 2, water remained on the board surface 2, and there was difficulty in writing immediately after wiping. This is because the eraser inclination θ is 2 degrees or the blade height b is 0.5 mm. Sample No. 3, sample no. The blade height b is set to 1 mm with respect to 2, but water remains on the board surface 2, and when the eraser inclination θ is 2 degrees and the blade height b is 1 mm, the state where there is difficulty in writing immediately after that is solved. Was not.

  Sample No. In 1-3, the water-wiping effect was obtained 0.5-1 times. This is because the wiping member thickness is 1 to 2 mm, so that the volume of the wiping member 9 is small and the water retention amount is small.

  Sample No. In sample 4, sample no. Although the eraser inclination θ was set to 5 degrees with respect to 2, water remained on the board surface 2 and there was difficulty in writing immediately after. As a result, it was confirmed that when the blade height b was 0.5 mm, even if the eraser inclination θ was 5 degrees, the state where there was difficulty in writing immediately after that was not solved.

  Sample No. 4, the wiping member thickness s was also set to 10 mm. Thereby, the volume of the wiping member 9 was increased, a large amount of water was retained, and the water wiping effect by repeated erasing was 12 times. It can be determined that the number of repeated erasures is not a problem in a normal use state, and the thickness s of the wiping member 9 for satisfying the repeated erasability is preferably 10 mm or more.

  Sample No. mentioned above. 1 to 4, when the eraser inclination θ is 2 degrees, the wiping surface 9b on the rear side in the wiping direction cannot be sufficiently separated from the board surface 2, and the wiping surface 9b on the rear side in the wiping direction contacts the board surface 2. Thus, it is determined that water adheres to the board surface 2 and writing cannot be performed immediately after wiping. Further, in order to stop the water W by the blade 11, the blade 11 needs to have a certain height, and when the blade height b is 0.5 mm, the blade 11 is buried in the wiping member 9. Therefore, it is determined that sufficient drainage by the blade 11 cannot be performed.

  Sample No. 4 resulted in difficulty in writing immediately after erasure, but the blade height b was set to 0.5 mm, and it is unclear whether or not the eraser inclination θ is 5 degrees. 5, the wiping member thickness s was 10 mm, the eraser inclination θ was 5 degrees, and the blade height b was 1 mm. This sample No. In No. 5, the writability immediately after erasure was good. Thus, in order to ensure the writing property immediately after erasing, the eraser direction θ should be 5 degrees or more, the blade height b should be 1 mm or more, and the wiping member thickness s for repeated erasing properties. It was confirmed that the thickness should be 10 mm or more.

  Sample No. 6-9, sample no. The dimensions identified in 5 are combined in an appropriately increased manner. Sample No. 6 is a case where only the height b of the blade 11 is 2 mm. In this case as well, sample no. The same effect as 5 was obtained.

  Sample No. Sample No. 7 The thickness s of the wiping member 9 is set to 15 mm, and the inclination θ of the eraser 6 is set to 10 degrees with respect to 5. In this case, the number of repeated erasures of water wiping increased to 16, and the writability immediately after erasure was determined as Sample No. It was the same as that of 5.

  Sample No. 8 ・ No. 9 are sample Nos. The height of the blade 11 is 2 mm and 3 mm with respect to 7. Even in this case, the number of repeated wiping with water wiping and the writability immediately after erasing are the same as in Sample No. It was the same as 7.

  From the table of FIG. It was found that the eraser 6 should be formed with each dimension of 5, and it was confirmed that there was no problem in practical use. Of course, no. You may form with each dimension of 6-9, and what is necessary is just to respond | correspond according to a use condition. For example, when a scene where writing / erasing is frequently repeated is considered, it is conceivable to use a wiping member 9 having a thickness s of 15 mm. In addition, when there is anxiety of water reattachment due to contact with the wiping surface 9b on the rear side in the wiping direction, it is preferable to use an eraser having a tilt angle of 10 degrees.

  Further, according to the eraser 6 of the present embodiment, the board surface 2 may be wiped by making the blade 11 perpendicular to the wiping direction in a wide range of erasing, but assisting in erasing a narrow range. This can be dealt with by using the blade 12. For example, as shown in FIG. 8, the eraser 6 is placed on the board surface 2 so that the vicinity 9c of the auxiliary blade 12 of either one of the pair of wiping surfaces 9a and 9b is in contact with the board surface 2 in a narrow range. Position it diagonally. In this state, the eraser 6 is moved in the direction indicated by the arrow B in the drawing, which is the longitudinal direction thereof.

  Even in this case, in the same manner as shown in FIG. 6, a part of the water retained by the wiping member 9 flows out from the vicinity portion 9c to the board surface 2, and the board portion 2 is wiped with the vicinity portion 9c. can do. Then, the water on the board surface 2 can be damped by the auxiliary blade 12 and returned to the wiping member 9.

  In the above embodiment, the cross-sectional shapes of the blade 11 and the auxiliary blade 12 are rectangular, but the cross-sectional shape is not limited to a rectangle. Examples of other shapes will be described with reference to FIG.

  The blade 21 in FIG. 9A is an example formed in a shape having a trapezoidal cross section. The trapezoidal upper base 21a is directed to the contact side with the board surface 2, and the lower base 21b is fixed to the wiping member 9. Even in this shape, the same effect as the above embodiment can be obtained. The blade 22 in FIG. 9B is an example formed in a shape having a triangular cross section. The triangular vertex 22a is directed to the contact side with the board surface 2 and the base 22b is fixed to the wiping member 9. Even in this shape, the same effect as the above embodiment can be obtained.

  Further, in the blade 11 having the rectangular cross section, as shown in FIG. 9C, incisions are made in the vicinity of the fixing side to the wiping member 9 from the outer side to the inner side in the width direction perpendicular to the longitudinal direction, You may make it the shape which provided the narrow neck part 23 extended in a longitudinal direction in the center part. This makes it easier for the neck portion 23 to bend when wiping in the direction perpendicular to the blade 11, and the edge 11 a easily follows the unevenness of the board surface 2. This shape can also be applied to the blades 21 and 22 shown in FIGS. 9A and 9B, and each neck 23 may be provided as shown by a two-dot chain line in each drawing. .

  FIG. 10 is a view corresponding to FIG. 3A showing the second embodiment of the eraser 6. 10, the same parts as those in FIG. 3A are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the example of FIG. 10, a surface member 24 formed of, for example, a synthetic fiber having water permeability as a cloth-like member is integrally provided on the outer surface of the wiping member 9. In the illustrated example, the surface member 24 is provided so as to cover the entire surface of the wiping member 9, but it is only necessary to be provided in a range that covers at least the wiping surfaces 9 a and 9 b in the first embodiment. The surface member 24 is fixed to the wiping member 9 by adhesion or the like at an appropriate place. Thereby, the permeability of water can be adjusted by appropriately changing the material of the surface member 24, and the adjustment of the amount of water oozing during wiping becomes easy.

  Further, by forming the surface member 24 from a material that is less likely to wear than the wiping member 9, the durability of the wiping surface 24 a of the surface member 24 by repeated erasure becomes higher than that of the wiping surface 9 a of the wiping member 9. Improves durability. As a result, it is not necessary to consider wear resistance for the material of the wiping member 9, a material mainly composed of water retention can be selected, and a wide selection of materials is possible.

  The present invention has been described with reference to the preferred embodiments. However, as those skilled in the art can easily understand, the present invention is not limited to such embodiments, and the gist of the present invention. As long as it does not deviate from the above, it can be appropriately changed. For example, in the above embodiment, the blades 11 and 12 are mounted on the wiping surfaces 9a and 9b. However, the blades 11 and 12 only have to protrude by a predetermined amount (for example, 1 mm) from the wiping surfaces 9a and 9b. The part may be attached so as to be buried in the wiping surfaces 9a and 9b. In addition, all the components shown in the above embodiment are not necessarily essential, and can be appropriately selected without departing from the gist of the present invention.

  The board eraser according to the present invention can wipe the board surface with water and erase the ink reliably. It is useful as an eraser for the board surface that repeats writing and erasing with marker ink or the like because it has an effect that water by wiping does not remain and can immediately start writing with a marker pen.

DESCRIPTION OF SYMBOLS 1 White board apparatus main body 2 Board surface 5 Marker pen 6 Eraser 7 Body 9 Wiping member 9a * 9b Wiping surface 11 Blade 12 Auxiliary blade 13 Water tank

Claims (6)

A board eraser for erasing characters and figures written in ink on the board surface.
A wiping member having a wiping surface capable of sliding on the board surface, and a blade attached to the wiping member;
The wiping member is made of an elastic body having water retention,
The board eraser according to claim 1, wherein the blade is made of an elastic body having higher rigidity than the wiping member, and protrudes a predetermined amount from the wiping surface.   The board eraser according to claim 1, wherein the blade is provided at a position that bisects the wiping surface.   3. The board eraser according to claim 2, wherein the wiping surface is formed by two inclined surfaces that bend at a position where the blade is provided.   4. The board eraser according to claim 2, wherein the wiping surface is provided with an auxiliary blade extending in a direction crossing the blade at an end of the blade. 5. .   5. The board eraser according to claim 1, wherein the wiping surface is formed by a water-permeable cloth-like member provided on a surface of the wiping member. The wiping member is supported by a gripping member for gripping by hand,
The board eraser according to any one of claims 1 to 5, wherein the gripping member has a built-in water tank for storing water to be supplied to the wiping member.

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