JP2617275B2 - Blackboard eraser - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

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

[0003] The chalk is manufactured by kneading calcined gypsum or chalk powder with water, and drying and curing it into a cylindrical or hexagonal column shape. When wiped by the blackboard erasing device, chalk dust adhering to the surface of the blackboard is scattered, adheres to the user of the blackboard and peripheral articles, and becomes dirty.
In addition, there is a problem that if the user sucks the scattered chalk black dust, health is impaired. A conventional technique for solving such a problem is disclosed in, for example, Japanese Utility Model Laid-Open No. 5-807.
No. 92 is disclosed. In this conventional technique, a black powder or a white powder wiped by a plurality of wiping rollers is captured by a filter in a dust collecting chamber by a suction force of a fan rotated by a motor, and characters written on a blackboard or a white board are erased. At this time, it is configured such that the fine powder of the chalk falling and scattered is sucked to prevent leakage to the outside.

In such a prior art, since the filter is housed in the dust collecting chamber, when discharging the powder accumulated in the filter, the filter is easily removed from the dust collecting chamber. There is a problem that it cannot be removed and it takes time to dispose of the powder. In addition, a motor for rotating each wiping roller is provided separately from the motor for driving the fan, and these motors are provided at both ends in the longitudinal direction of the apparatus. When wiping is performed, there is a problem that the inertia force in the movement direction by the motor provided at the other end in the longitudinal direction acts on the hand of the user, the grip cannot be stably held, and the usability is poor. Further, since the suction port where the powder collection chamber and the filter are opened remains open, there is a problem that the powder once collected in the filter leaks from the suction port to the outside. Furthermore, in the above prior art,
Since the powder scattered to the outside of the wiping roller is not sucked, the powder is pushed in the moving direction at the time of wiping, so that there is a problem that the powder cannot be prevented from being scattered at the time of wiping. .

[0004] Therefore, an object of the present invention is to stably grip the wiping, prevent leakage of the sucked powder, and remove the dust of the black ink on the blackboard when the written contents are erased. An object of the present invention is to provide a blackboard erasing device capable of preventing scattering.

[0005]

According to the present invention, there is provided a wiping member which is formed in a horizontally long annular shape and is resiliently pressed against a blackboard, and wipes characters and designs written in black ink on the blackboard, and a wiping member for the wiping member. And a suction means for suctioning said black chalk dust through said suction hole, said suction means being a base on which a wiping member is fixed and said suction hole is formed. A table, including a main body detachably attached to the base, the main body, a hollow dome-shaped cover body,
A bottom plate that closes the opening of the cover body, a bag-shaped filter that has air permeability and captures black dust, a suction fan, and a motor that is provided on the bottom plate and rotates the suction fan, and is provided on the bottom plate; A rechargeable battery for supplying drive power to the motor, wherein the cover body has an internal space, a first space in which the bag-shaped filter is stored, and a first space in which the suction fan, the motor, and the rechargeable battery are stored. A partition wall is formed for partitioning the suction space into two spaces, and a suction passage for guiding suction force generated by a suction fan from the second space to the first space is formed on the partition wall. A cylindrical fitting protrusion which is enclosed and removably fitted with the bag-shaped filter; and a suction passage which surrounds the suction hole inside the fitting protrusion and rises substantially at a right angle from the base, and a suction passage. Includes an annular support surface that rises closer The valve seat is provided with a sheet-shaped valve element which is flexible and resilient and opens toward the suction passage by suction force. On both sides in the width direction both sides perpendicular to the longitudinal direction of the main body, concave portions into which the gripped fingers are fitted are formed, and one concave portion into which the thumb fits when gripped is formed from the rechargeable battery. A blackboard erasing device, wherein a switch and a rechargeable battery for supplying / interrupting electric power to the motor are provided closer to one end in the longitudinal direction than to the central portion in the longitudinal direction.

According to the present invention, the wiping member is provided with a plurality of through holes communicating with an inner peripheral portion facing the concave groove surrounded by the wiping member and an outer peripheral portion facing the external space, and is spaced apart in the circumferential direction. It is characterized by being formed.

[0007]

[0008]

According to the present invention, when the switch is turned on with the thumb while grasping the powder, the motor is driven by the power of the rechargeable battery, and the suction fan rotates to generate a suction force. It is guided from the second space to the first space via a suction passage provided in the body and the partition wall. The first space is provided with a bag-shaped filter to which a cylindrical fitting protrusion formed on the substrate is detachably mounted, and the suction force is guided into the bag-shaped filter. A valve seat surrounding the suction hole is formed in the substrate, and a valve body is seated on the valve seat. The valve body has flexibility and resilience, is formed in a sheet shape, and the support surface of the valve seat is formed high near the suction passage, so that the valve seat is provided with the suction introduced into the bag-shaped filter. Released by force,
The suction force is guided to the suction hole. By the suction force guided to the suction hole in this way, the black ink powder can be captured and collected in the bag-shaped filter, and leakage to the outside can be prevented. When the powder accumulated in the bag-like filter is discarded, the powder can be easily discarded from the bag-like filter by removing the bag-like filter separating the substrate and the main body. The cover body is formed with concave portions into which fingers gripped are formed on both sides in the width direction perpendicular to the longitudinal direction of the main body, so that the main body can be stably gripped, and a switch on / off operation can be performed. Can also be easily performed. Moreover, since the switch and the rechargeable battery are provided closer to one end than the center in the longitudinal direction of the main body, it is possible to stably move the main body in the direction intersecting the longitudinal direction at the time of wiping by gripping this one end. Can be. As described above, the main body can be stably wiped by gripping one longitudinal end thereof,
It is possible to wipe out and erase the description of the blackboard in a wider range than the reach.

Further, according to the present invention, since a plurality of through holes are formed in the wiping member at intervals in the circumferential direction, dust scattered outside the wiping member is sucked through the respective through holes. Thus, scattering of dust generated at the time of wiping can be more reliably prevented.

[0010]

[0011]

FIG. 1 shows a blackboard erasing apparatus 1 according to one embodiment of the present invention.
FIG. 2 is a sectional view taken along line II-II of FIG.
It is sectional drawing seen from. Blackboard erasing device 1 of this embodiment
Basically, an annular wiping member 2 for wiping characters and designs written in black and white on a blackboard, and a wiping member 2
And a suction means 5 for sucking the black ink dust through the suction hole 4.

The wiping member 2 includes a cushion member 6 made of a foamed synthetic resin such as a sponge.
A skin sheet 7 surrounding the cushion material 6 and made of cloth.
Are formed in a so-called horizontally long donut shape. With such a wiping member 2, the wiping surface 3 formed by a part of the surface facing the outside of the skin sheet 7 is elastically pressed against a blackboard, and characters written in black on the blackboard are displayed. And symbols can be wiped and erased.

[0013] The black ink is generally called chalk,
Gypsum or chalk powder is kneaded with water, and it is cylindrical or 6
It is dried and cured into a prismatic shape, and includes various colors such as white, red, yellow, and blue. In order to erase characters, designs, and the like written on the blackboard with such black ink, the eraser 1 is moved while the wiping surface 3 is pressed against the surface of the blackboard, so that the characters, designs, and the like are erased. The description is wiped, and the black ink powder, particularly the fine powder, attached to the wiping surface 3 can be sucked through the suction hole 4.

The suction means 5 includes a synthetic resin base 8 fixed to the wiping member 2 and having the suction hole 4 formed therein, and a main body 9 detachably mounted on the base 8. .
The main body 9 is a hollow dome-shaped cover body 10 made of synthetic resin.
A bottom plate 11 for closing the opening of the cover body 10;
A bag-shaped filter 13 housed in an internal space 12 defined by the bottom plate 11 and the suction plate 14, a suction fan 14,
A motor 15 for rotationally driving the suction fan 14;
And a rechargeable battery 16 for supplying drive power to the power supply 5.

The cover body 10 is integrally formed with a partition wall 19 for partitioning the internal space 12 into first and second spaces 17 and 18 toward the bottom plate 11. The partition wall 19 has a straight cylindrical shape. Is formed integrally, and the cylindrical portion 20 is formed.
Forms a suction passage 21. Cylinder 20
A lattice-shaped suction preventing member 22 for preventing suction is fixed to the opening of the first space 17 by an adhesive. In the vicinity of the partition wall 19 and the suction prevention member 22, the second
The 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.
Is formed with a raised portion 23 which is outwardly convex, and the second space 1
8 is configured to be large so that the suction fan 14 having a large diameter can be accommodated. The exhaust air from the suction fan 14 is exhausted to the outside through an exhaust hole 24 formed in the rear part of the cover body 10, that is, in the right part of FIG. Therefore, the motor 15 is disposed 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 the rotation of the suction fan 14 is guided to the first space 17 through the suction passage 21. The bag-shaped 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 black dust, and a ring-shaped synthetic resin to which an opening of the bag-shaped body 25 is fixed. And a frame 26. The frame body 26 to which the bag-like body 25 is fixed is integrally formed on the base 8 and is detachably fitted in a cylindrical fitting projection 27 surrounding the suction hole 4 in an airtight state. In this state, the bag-shaped filter 13 is open to the suction hole 4.
Therefore, the black dust sucked through the suction hole 4
It is captured and stored in the bag 25.

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

The base 8 also has a peripheral portion of the suction hole 4,
That is, the valve seat 35 that defines the peripheral edge of the suction hole rises substantially perpendicularly to the main body 9 side and is integrally formed. The cross-sectional shape of the valve seat 35 is rectangular, and the support surface 36 is formed so as to become higher as it approaches the suction passage 21. The support surface 36 is annular, and a seat-like valve body 37 made of a flexible and elastic material such as rubber is seated and supported. When the suction fan 14 is driven to rotate, the valve body 37 opens toward the suction passage 21 due to the suction force, and a base end 39 opposite to the open end 38 is
The base 8 is fixed to the surface facing the first space 17 by, for example, an adhesive.

FIG. 3 is a front view of the blackboard erasing device 1 shown in FIGS. 1 and 2, FIG. 4 is a bottom view of the blackboard erasing device 1 viewed from below in FIG. 3, and FIG. FIG. 6 is a side view of the blackboard erasing device 1 as viewed from the left side of FIG. 3, and FIG. 6 is a side view of the blackboard erasing device 1 as viewed from the right side of FIG. Referring also to FIG. 2, concave portions into which fingers shown by phantom lines 42 in FIG. 3 are fitted on both side portions 41 a and 41 b on both sides in the width direction perpendicular to the longitudinal direction of the main body 9 of the cover body 10. 43
a and 43b are respectively formed, and a switch 44 for supplying / cutting power from the rechargeable battery 16 to the motor 15 is provided in one concave portion 43b into which the thumb fits when gripped. The switch 44 is provided closer to the rechargeable battery 16 than the center 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 center. Therefore, when the main body 9 is gripped by the fingers 42 as shown in FIG.
Can be turned on / off. Since the rechargeable battery 16 is gripped closer to the center of the main body 9 than in the above-described manner, characters and figures written at a high place on the blackboard can be easily wiped and erased, and the gripper can be stably gripped. Thus, the switch 44 can be operated.

The wiping member 2 has suction recesses 45a and 45b formed at both ends along the longitudinal direction of the main body 9, and these suction recesses 45a and 45b are formed on the surface of the blackboard by the wiping surface of the wiping member 2. 3 is pressed away from the surface of the blackboard, and communicates the suction hole 4 with the external space. Thereby, the black dust scattered at the time of wiping can be sucked through the suction recesses 45a and 45b. As described above, each of the suction recesses 45a and 45b is erased by the erasing device 1.
Are formed at both ends in the longitudinal direction of the wiping member, so that when the wiping member is wiped in a lateral direction perpendicular to the paper surface of FIG. 3, a wide wiping width B is provided over substantially the entire length in the longitudinal direction of the wiping member 2 (left-right direction in FIG. 3). Thus, it is possible to efficiently erase the description on the blackboard and to reduce scattering of dust. Further, a longitudinal concave groove 46 communicating with the suction hole 4 is formed at the center of the annular wiping member 2,
As a result, the suction force can be almost uniformly guided to the entire surface of the wiping surface 3 over the width B, and the black dust adhering to the wiping surface 3 can be sucked over almost the entire area.

A connector 47 is provided at one longitudinal end of the cover body 10 on the side where the rechargeable battery 26 is provided.
The rechargeable battery 16 can be charged by connecting a plug of a rectifier transformer such as a commercially available adapter that rectifies and transforms the power from a commercial AC power supply.

[0022]

[0023]

FIG. 7 is a bottom view of a blackboard erasing device 1b according to still another embodiment of the present invention as viewed from below, and FIG. 8 is a front view of the blackboard erasing device 1b. In the blackboard erasing device 1b of this embodiment, a plurality of through holes 5 are provided at intervals in the circumferential direction.
5 is provided. Each through hole 55
Communicates an inner peripheral portion of the wiping member facing the concave groove 46 and an outer peripheral portion facing the external space, and the suction force from the suction hole is guided. Therefore, it is not necessary to form the suction recesses 45a and 45b in the wiping member 56 as in the above-described embodiment, and each through-hole that opens toward the surface of the blackboard while being pressed against the surface of the blackboard. Dust and the like of chalk can be sucked from almost the entire circumference in the circumferential direction. Such a through hole 55 may be realized by, for example, a thin tube made of synthetic resin, or may be formed by directly piercing the wiping member 56.

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

As still another embodiment of the present invention, the exhaust air from the suction fan 14 is guided to the concave groove 46 to be sucked and circulated through the suction hole 4 so that only the black dust is captured by the bag-shaped filter 13. You may. With such a configuration, the load on the motor 15 can be reduced and the suction holes 4
Can be improved.

[0027]

According to the present invention, since the fitting projection is formed on the base on which the main body is detachably mounted, and the bag-like filter is removably fitted, the bag-like filter is provided. And the powder accumulated in the bag-shaped filter can be easily discarded. In addition, since a valve seat that rises vertically from the base is formed inside the fitting projection and this valve seat is closed by a sheet-shaped valve body, powder in the bag-shaped filter leaks to the outside. Is prevented. Further, concave portions are formed on both sides of the cover body, and a switch for supplying / cutting power from the rechargeable battery to the motor is provided in one of the concave portions. And the switch can be operated easily and stably. In addition, since the switch and the rechargeable battery are provided closer to one longitudinal end than the longitudinal central portion of the main body, the center of gravity of the device exists closer to one end than the longitudinal central portion, and the wiping operation is performed stably. be able to.

Further, according to the present invention, since a plurality of through-holes are formed in the wiping member at intervals in the circumferential direction, the suction force is guided to each of the through-holes and scattered to the outside of the wiping member during wiping. The powder can be sucked, whereby the scattering of the powder at the time of wiping can be more reliably prevented.

[0029]

[Brief description of the drawings]

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

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

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

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

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

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

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

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

[Explanation of symbols]

 1, 1b Blackboard erasing device 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 Valve body 43a, 43b Recessed portion 45a, 45b Suction recess 46 Recess Groove 50 Through hole

Claims (2)

(57) [Claims] 1. A wiping member which is formed in a horizontally long annular shape and resiliently presses against a blackboard to wipe characters and designs written in white chalk on the blackboard, and a suction hole which opens to face a wiping surface of the wiping member. And a suction unit for sucking the black dust through the suction hole, wherein the suction unit is fixed to a wiping member and the suction hole is formed, and is detachably attached to the base. The main body is a hollow dome-shaped cover body, a bottom plate that closes the opening of the cover body, a bag-shaped filter that has air permeability and captures black chalk dust, and a suction fan. , Provided on the bottom plate,
A motor for rotating the suction fan; and a rechargeable battery provided on the bottom plate for supplying drive power to the motor. The cover body has an internal space defined by a first space in which the bag-shaped filter is housed. A partition wall is formed to partition the suction fan, the motor, and the second space in which the rechargeable battery is housed, and the partition wall has a suction passage for guiding a suction force generated by the suction fan from the second space to the first space. Is formed on the base, and a cylindrical fitting protrusion that surrounds the suction hole and into which the bag-shaped filter is removably fitted, and the suction hole is formed outside the fitting protrusion. A valve seat having an annular support surface that rises substantially at a right angle from the base and is raised toward the suction passage, the valve seat having flexibility and resilience; And a sheet that opens to the suction passage by suction force A concave portion is formed on each of both sides of the cover body in the width direction perpendicular to the longitudinal direction of the main body, and a concave portion into which a grasped finger fits is formed, and a thumb fits when grasped. A switch for supplying / cutting power from the rechargeable battery to the motor and a rechargeable battery are provided in the one concave portion closer to one end in the longitudinal direction than the central portion in the longitudinal direction. Erasing device. 2. A plurality of through-holes are formed in the wiping member so as to communicate between an inner peripheral portion facing a groove surrounded by the wiping member and an outer peripheral portion facing an external space at intervals in a circumferential direction. The erasing device for a blackboard according to claim 1, wherein: