JPH07309099A - Eraser for blackboard - Google Patents

Abstract

PURPOSE:To prevent scattering of coarse particulate of chalk from occurring when a character, a pattern, etc., which are recorded on a blackboard with chalk are erased. CONSTITUTION:A wiping off member 2 with which a character and a pattern which are recorded on a blackboard with chalk are wiped off, is provided with a suction means 5 composed by containing a suction fan 14 and a motor 15. The coarse particulate of chalk wiped off with a wiping off face 3 of the wiping off member 2 is sucked via an open suction hole 4 facing the wiping off face 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blackboard erasing device for wiping and removing characters and patterns written in black on a blackboard.

[0002]

2. Description of the Related Art Conventionally, a blackboard is provided in, for example, a school classroom or a conference room, and arbitrary characters and patterns are written on the blackboard with black ink. This description is so-called blackboard erase It is wiped and erased by the device.

[0003]

In the above prior art, since the white ink is produced by kneading calcined gypsum or chalk powder with water, and drying and hardening it into a cylindrical or hexagonal column shape. , When the letters or patterns written on this chalk are wiped off with the blackboard erasing device, the dust of the chalk adhered to the surface of the blackboard scatters and adheres to the user of the blackboard and the surrounding objects and stains it. Will end up. In addition, if the user sucks the scattered dust of black ink, there is a problem that the health is damaged.

Therefore, it is an object of the present invention to provide a blackboard erasing device which can prevent dust of the black ink from scattering when the contents written on the blackboard by the black ink are erased.

[0005]

The present invention has a wiping member for wiping characters and designs written in black on a blackboard, and a suction hole that opens toward the wiping surface of the wiping member,
A blackboard erasing device comprising: suction means for sucking the dust of the black ink through the suction hole.

Further, the present invention is characterized in that the suction means includes a bag-like filter which is detachably attached to a peripheral portion of the suction hole on the downstream side in the suction direction and which has air permeability and captures the dust. To do.

Further, the present invention is characterized in that the wiping member is formed with a plurality of through holes that are open to the outside of the wiping surface and communicate with the suction holes.

[0008]

According to the present invention, a wiping member for wiping the blackboard,
And a suction means having a suction hole that opens toward the wiping surface of the wiping member, and the dust of the white ink wiped on the wiping surface is sucked through the suction hole. As a result, the dust attached to the wiping surface can be quickly sucked and removed, so that the dust can be prevented from scattering to the outside.

Further, according to the invention, the suction means is provided with a bag-shaped filter at the peripheral portion of the suction hole on the downstream side in the suction direction. With such a bag-like filter, the sucked dust can be captured and collected. Also, since this bag-shaped filter is detachably attached to the suction means, when dust collects in the filter, the filter is taken out from the suction means, the dust in the filter is discarded, and the filter is again attached to the periphery of the suction hole. It can be attached to the part, and the sucked dust can be easily treated.

Further, according to the present invention, the wiping member is formed with a plurality of through holes that are open to the outside of the wiping surface. These through-holes communicate with the suction holes, so that the dust scattered outside of the wiping surface when wiped can be sucked through each through-hole. As a result, it is possible to improve the collection efficiency of the dust scattered during the wiping.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a blockboard erasing apparatus 1 according to an embodiment of the present invention.
2 is a cross-sectional view of FIG. 2, and FIG. 2 is a cross-sectional line II-II of FIG. 1.
It is sectional drawing seen from. Blackboard erasing device 1 of the present embodiment
Is basically a ring-shaped wiping member 2 for wiping off characters and patterns written in black on a blackboard, and a wiping member 2
It has a suction hole 4 which opens to face the wiping surface 3, and suction means 5 which sucks the dust of the white ink through the suction hole 4.

The wiping member 2 includes a cushion material 6 made of foamed synthetic resin such as sponge,
An outer skin sheet 7 made of cloth surrounding the cushion material 6
And has a so-called horizontally long donut shape. With the wiping member 2 described above, the wiping surface 3 formed by a part of the surface of the outer skin sheet 7 that is exposed to the outside is elastically pressed against the blackboard, and the characters written in black on the blackboard. You can wipe and erase the pattern.

The white ink is generally called chalk,
Mix calcined gypsum or chalk powder with water to give a columnar or 6
It refers to what is dried and cured in the shape of a prism, and there are various colors such as white, red, yellow, and blue. In order to erase the characters and patterns written on the blackboard with such a black ink, by moving the erasing device 1 while the wiping surface 3 is pressed against the surface of the blackboard, the characters and patterns are removed. It is possible to suck the white powder, particularly fine powder, which has been wiped off and adhered to the wiping surface 3 through the suction hole 4.

The suction means 5 includes a base 8 made of synthetic resin, which is fixed to the wiping member 2 and in which the suction holes 4 are formed, and a main body 9 which is detachably mounted on the base 8. .
The main body 9 includes a dome-shaped cover body 10 made of synthetic resin, a bottom plate 11 that closes an opening of the cover body 10, and a bag-shaped filter 13 housed in an internal space 12 defined by the cover body 10 and the bottom plate 11. A suction fan 14, a motor 15 that rotationally drives the suction fan 14, and a rechargeable battery 16 that supplies driving power to the motor 15.

A partition wall 19 for partitioning the internal space 12 into first and second spaces 17 and 18 is integrally formed on the cover body 10 toward the bottom plate 11, and the partition wall 19 has a right cylindrical shape. The tubular portion 20 of the
The suction passage 21 is formed by the inner peripheral surface of the. Tubular part 20
At the opening of the first space 17, a lattice-shaped suction preventing member 22 for preventing suction is fixed by an adhesive. In the vicinity of the partition wall 19 and the suction prevention member 22, the second
A suction fan 14 is provided in the space 18. Such a suction fan 14 preferably has a large diameter in order to obtain a large suction force, and therefore the cover body 10 is provided.
A bulge 23 that is convex outward is formed in the second space 1
The volume of the suction fan 14 having a large diameter is accommodated by increasing the volume of the suction fan 8. The exhaust air from the suction fan 14 is exhausted to the outside from an exhaust hole 24 formed in the rear portion of the cover body 10, that is, the right side portion in FIG. Therefore, the motor 15 is arranged between the exhaust hole 24 and the suction fan 14, and the motor 15 can be cooled by the air discharged from the suction fan 14.

The suction force generated by rotationally driving the suction fan 14 is introduced into the first space 17 through the suction passage 21. The bag filter 13 is provided in the first space 17. The bag-shaped filter 13 is made of, for example, a non-woven fabric that has air permeability and can capture dust of chalk, and a ring-shaped synthetic resin to which the opening of the bag 25 is fixed. And a frame 26. The frame body 26 to which the bag-shaped body 25 is fixedly formed is integrally formed on the base 8 and is detachably fitted in a tubular fitting projection 27 surrounding the suction hole 4 in an airtight state. In this state, the bag filter 13 faces the suction hole 4 and opens.
Therefore, the dust of the black ink sucked through the suction holes 4 is
The bag 25 is captured and stored.

A cover body 10 is provided on the periphery of the bottom plate 11.
The peripheral edge portion of is adhered by, for example, an adhesive. Further, a rising portion 29 in which a screw hole 28 is formed is formed in the left end portion of the bottom plate 11 in FIG. 1, and a shaft portion of a bolt 30 is screwed into the rising portion 29. An engaging recess 32 is formed at the right end of the bottom plate 11 in FIG. 1 with which an engaging claw 31 formed integrally with the base 8 engages. At the left end portion of the base 8 in FIG. 1, a rising portion 34 having a U-shaped notch 33 through which the shaft portion of the bolt 30 is loosely formed is integrally formed. With such a structure, the base 8 to which the wiping member 2 is fixed
The main body 9 and the main body 9 are detachably attached, and the dust inside the bag-shaped filter 13 can be discarded in a state where the main body 9 is detached from the base 8.

A valve seat 35, which is a peripheral portion of the suction hole 4, is integrally formed on the base 8 so as to rise substantially perpendicularly to the main body 9 side. The cross-sectional shape of the valve seat 35 is rectangular, and the support surface 36 is configured to be higher as it approaches the suction passage 21.
Is formed. The support surface 36 is annular and supports a sheet-shaped valve body 37 made of a flexible and elastic material such as rubber. When the suction fan 14 is rotationally driven, the valve body 37 opens to face the suction passage 21 by its suction force, and the base end 39 on the side opposite to the open end 38 of the base 8. On the surface facing the first space 17,
For example, it is fixed by an adhesive.

FIG. 3 is a front view of the blackboard erasing apparatus 1 shown in FIGS. 1 and 2, FIG. 4 is a bottom view of the blackboard erasing apparatus 1 as seen from below in FIG. 3, and FIG. 3 is a side view of the blackboard erasing apparatus 1 viewed from the left side of FIG. 3, and FIG. 6 is a side view of the blackboard erasing apparatus 1 viewed from the right side of FIG. 3. Referring also to FIG. 2, concave portions 43a and 43b, into which fingers are fitted, shown by imaginary lines 42 in FIG. 3, are formed on both side portions 41a and 41b of the cover body 10, respectively, and one concave portion 43b. Is provided with a switch 44 for supplying / shutting off the electric power from the rechargeable battery 16 to the motor 15. The switch 44 is provided closer to the rechargeable battery 16 than the central portion in the longitudinal direction of the blackboard erasing device 1, and the center of gravity of the blackboard erasing device 1 is closer to the rechargeable battery 16 than the central portion. Therefore, when the main body 9 is grasped by the fingers 42 as shown in FIG. 3, it can be stably supported, and
The switch 44 can be turned on / off by a thumb. In this way, the rechargeable battery 16 is gripped closer to the central portion of the main body 9, so that the characters and figures written on the high places of the blackboard can be easily wiped and erased, and the gripping is stable. Then, the switch 44 can be operated.

The wiping member 2 has suction recesses 45a and 45b formed at both ends in the longitudinal direction thereof. The suction recesses 45a and 45b press the wiping surface 3 of the wiping member 2 against the surface of the blackboard. In this state, it is separated from the surface of the blackboard and communicates the suction hole 4 with the external space. As a result, the dust of the black ink scattered at the time of wiping is removed in each suction recess 45.
It can be suctioned via a and 45b. Since the suction recesses 45a and 45b are formed at both ends in the longitudinal direction of the erasing device 1 as described above, when the wiping member 2 is wiped in the lateral direction perpendicular to the paper surface of FIG. A wide wiping width B can be obtained over substantially the entire length in the left-right direction (3), the description on the blackboard can be erased efficiently, and dust scattering can be reduced. Further, the annular wiping member 2 has a longitudinal groove 46 formed in the center thereof and communicating with the suction hole 4, whereby the suction force can be guided substantially uniformly over the entire wiping surface 3 over the width B. Therefore, the dust of the black ink attached to the wiping surface 3 can be sucked over almost the entire area.

A connector 47 is provided on one side of the cover body 10 on the side where the rechargeable battery 26 is provided, and a plug of a rectifying transformer such as a commercially available adapter is connected from a commercial AC power source to The rechargeable battery 16 can be charged.

FIG. 7 is a sectional view showing a blackboard erasing device 1a according to another embodiment of the present invention. The parts corresponding to those in the embodiment shown in FIGS. 1 to 6 are designated by the same reference numerals.
In this embodiment, it should be noted that two sheet-shaped valve bodies 48a and 48b made of a flexible and elastic material such as rubber or silicon, and the respective valve bodies 48a and 48b.
There is provided a suction cylinder 49 having a rectangular cross section whose base ends are fixed by screws or the like. Each valve body 48a, 48
The free ends 50a and 50b of b are the first space 1 of the suction cylinder 49.
It extends near the end face 51 on the 7 side and elastically abuts each other. These valve bodies 48a and 48b function as check valves, and can prevent the dust particles of the black ink stored in the bag filter 13 from flowing back and leaking to the outside. Moreover, since the suction cylinder 49 is formed so as to stand upright in the first space 17, the dust sucked into the bag-shaped filter 13 is accumulated on the valve bodies 48a, 48b, so that the respective valve bodies 48a, 48b. It is possible to prevent the free ends 50a and 50b of the 48b from being prevented from being opened by the suction force.

As another embodiment of the present invention, which is similar to this embodiment, as shown by a phantom line 52 in FIG.
May have a truncated pyramid shape. This makes it possible to further reduce the amount of dust accumulated on the valve elements 48a and 48b.

FIG. 8 is a bottom view of a blackboard erasing apparatus 1b according to still another embodiment of the present invention as seen from below, and FIG. 9 is a front view of the blackboard erasing apparatus 1b. The blackboard erasing device 1b of this embodiment is provided with a wiping member 56 having a plurality of through holes 55 formed in the circumferential direction. Each of the through holes 55 communicates the concave groove 46 with the external space, and the suction force from the suction holes is introduced thereto. Therefore, as in the previous embodiment,
It is not necessary to form the suction recesses 45a and 45b on the wiping member 56, and the dust of white ink or the like is circulated through the respective through holes 55 which are opened to face the surface of the blackboard while being pressed against the surface of the blackboard. It is possible to suck from almost the entire circumference in the direction. Such a through hole 55 may be realized by, for example, a synthetic resin thin tube, or may be formed by directly boring the wiping member 56.

As still another embodiment of the present invention, an axial fan may be used instead of the suction fan 14 which is a centrifugal fan. Further, the wiping member 2 is not limited to the structure in which the cushion material 6 is surrounded by the outer skin sheet 7, but may be configured to use other structures, for example, only the cushion material made of foamed synthetic resin such as sponge.

As still another embodiment of the present invention, the exhaust air from the suction fan 14 is guided to the concave groove 46, sucked from the suction hole 4 and circulated, and only the dust of the black ink is captured by the bag filter 13. May be. With such a configuration, the load on the motor 15 is reduced and the suction hole 4
It is possible to improve the suction force at.

[0027]

According to the present invention, since the dust of the black ink wiped by the suction means can be sucked from the suction hole facing the wiping surface, the dust of the black ink is scattered when erasing the description on the blackboard. It is possible to prevent the pollution of the environment around the blackboard due to dust, or to eliminate it.

Further, according to the present invention, since the bag-shaped filter is provided in the suction means, the dust sucked through the suction hole can be stored in the bag-shaped filter and can be collectively discarded. Dust can be easily treated.

Further, according to the present invention, since the plurality of through holes are formed in the wiping member, the suction force is introduced through these through holes, and the dust floating on the outer side of the wiping member can be efficiently provided. Can be aspirated. This makes it possible to improve the suction efficiency of the black dust.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a blackboard erasing device 1 according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the section line II-II in FIG.

3 is a front view of the blackboard erasing device 1 shown in FIGS. 1 and 2. FIG.

FIG. 4 is a bottom view of the blackboard erasing device 1.

5 is a side view of the blackboard erasing device 1 viewed from the left side of FIG. 3. FIG.

6 is a side view of the blackboard erasing device 1 viewed from the right side of FIG. 3. FIG.

FIG. 7 is a cross-sectional view showing a blackboard erasing device 1 according to another embodiment of the present invention.

FIG. 8 is a blackboard erasing device 1 according to still another embodiment of the present invention.
It is a bottom view which shows b.

9 is a front view of the blackboard erasing device 1b of the embodiment shown in FIG. 8. FIG.

[Explanation of symbols]

 1, 1a, 1b Erase device for blackboard 2, 56 Wiping member 3 Wiping surface 4 Suction hole 5 Suction means 10 Cover body 13 Bag-shaped filter 14 Suction fan 16 Rechargeable battery 37; 48a, 48b Valve body 43a, 43b Recessed portion 45a, 45b suction recess 46 recess groove 50 through hole

Claims (3)

[Claims] 1. A blackboard has a wiping member for wiping letters and patterns written in black on the blackboard, and a suction hole that opens toward the wiping surface of the wiping member. The dust of the white ink is removed through the suction hole. A blackboard erasing device comprising: a suction means for sucking. 2. The suction means includes a bag-shaped filter which is detachably attached to a peripheral portion of the suction hole on the downstream side in the suction direction and which has air permeability and captures the dust. 1. The blackboard erasing device according to 1. 3. The blackboard according to claim 1, wherein the wiping member is formed with a plurality of through holes that are open to the outside of the wiping surface and communicate with the suction holes. Eraser.