JPH0825891A - Black board erasing device - Google Patents

Abstract

PURPOSE:To provide a black board erasing device, with which a black board can be fully erased without spattering chalk dusts. CONSTITUTION:A black board erasing device has a powder sucker 1, a connecting hose 2, the basic end part side of which is connected to the suction port of the powder sucker 1, while some part of the tip side of which has a flexible structure, and an erasing utensil 3, which is installed at the tip of the connecting hose 2 and one surface of which acts as an erasing surface providing with suction holes opened on its rear or side surface. When the powder sucker 1 is put into action, air is sucked through the suction holes of the erasing utensil 3. By erasing chalk under the condition that the erasing surface of the erasing utensil 3 under sucking state is pushed against a black board 9, the chalk dusts intending to scatter are sucked through the suction holes, resulting in preventing chalk dusts from scattering and keeping the air in a room clean.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blackboard wiping device for wiping chalk off a blackboard.

[0002]

2. Description of the Related Art Conventionally, as a tool for wiping off chalk on a blackboard, there has been a blackboard wiping structure in which the front surface of a hard substrate is covered with a wiping cloth and a cushion material is filled between the substrate and the wiping cloth.

[0003]

The substance of the above-mentioned blackboard wiping is that the wiping cloth is immediately clogged with chalk powder, so that the chalk powder is scraped off.
Therefore, it is difficult to wipe off the chalk cleanly, and in addition, the chalk powder may be scattered and filled in the room, which may impair the health of the instructor and the students. Moreover, since the chalk powder is accumulated in the room, it is necessary to frequently clean the room.

The present invention has been made in view of the above, and an object thereof is to provide a blackboard wiping device which does not scatter chalk powder.

[0005]

In order to achieve the above object, the present invention provides a powder suction machine, a base end side of which is connected to a suction port of the powder suction machine and at least a part of the tip side is flexible. It has a certain connection hose and a wiping tool which is attached to the tip of the connection hose and has a wiping surface for choke provided on at least one surface thereof, and the wiping tool has a powder so as to open on the back side or the side surface of the wiping surface. Provided is a blackboard wiping device provided with suction holes for use with the blackboard.

Further, a switch for turning on / off the powder suction device may be provided in the wiping tool.

Further, it is preferable that the suction holes of the wiping tool are formed in a long hole shape in a direction orthogonal to the wiping operation direction, and a plurality of suction holes are provided so as to sandwich the wiping surface.

[0008]

Operation When the powder suction device is turned on, air is sucked from the suction hole of the wiping device through the connecting hose. In this suction state, when the wiping surface of the wiping tool is pressed against the blackboard to wipe off the chalk, the chalk powder that is about to scatter is sucked from the suction hole. Therefore, the chalk powder is not scattered and the indoor air is kept clean.

Further, a powder suction device is turned on / off in the wiping tool.
If a switch for FF is provided, the powder suction device can be operated only when it is necessary for wiping, so that energy is not wasted.

Further, the suction hole of the wiping tool is formed in a long hole shape in a direction orthogonal to the wiping operation direction, and
The suction efficiency of the choke is highest if a plurality of wipes are provided so as to sandwich the wiping surface.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a front view showing the entire blackboard wiping device, FIG. 2 is an exploded perspective view of the wiping device, FIG. 3 is a sectional view of the powder suction device, and FIG. 4 is a sectional view of the wiping device showing a usage state. .

As shown in FIG. 1, the blackboard wiping device comprises a powder suction device 1, a connecting hose 2, and a wiping tool 3. The powder suction machine 1 is installed under the floor of a building. As shown in FIG. 3, the powder suction device 1 is one in which a liquid chamber 5 and an air chamber 6 are formed in a vertical position inside a casing 4, and a vacuum motor 7 is integrally incorporated. A filter 8 is provided between the liquid chamber 5 and the air chamber 6. The suction port 1a of the powder suction device 1 is opened so as to communicate with the liquid chamber 5, and the air sucked from the suction port 1a by the drive of the motor 7 passes through the filter 8 and enters the air chamber 6 and the casing as it is. 4 is discharged to the outside from the exhaust stack 1b protruding to the rear surface. The liquid chamber 5
Water W is contained inside the suction port 1a.

The connecting hose 2 includes a fixed hard hose 2a and a flexible hose 2 having a bellows-like flexible structure.
b, and the base end of the hard hose 2a is connected to the suction port 1a of the powder suction device 1. In this embodiment, since the powder suction device 1 is installed under the floor of the building, the hard hose 2a is piped through the wall of the building or under the floor to the center of the lower end of the blackboard 9. On the other hand, a flexible hose 2 having a flexible structure
b is connected to the end of the hard hose 2a via a removable joint 10, and has a length such that the tip reaches every corner of the blackboard 9 as shown by the chain double-dashed line in FIG. Flexible hose 2
b is detachable from the hard hose 2a because the flexible hose 2b is more easily damaged than the hard hose 2a, and the length needs to be adjusted according to the size of the blackboard 9. is there. In the embodiment, the storage box 11 is provided in the lower wall surface of the blackboard 9 and the flexible hose 2b is stored in the storage box 11. By doing so, since the flexible hose 2b is not exposed to the outside, there is no possibility of catching a part of the body such as a foot on the flexible hose 2b, and therefore, the flexible hose 2b may fall and be injured, or it may be flexed by a tensile impact. The hose 2b does not break. In addition, the flexible hose 2
Since b is not exposed to the outside, it is easy to clean the wall and floor, and the appearance is neat.

The hard hose 2a is provided with a spray nozzle 12 near the blackboard 9. The spray nozzle 12 has a tip facing the inside of the hard hose 2a, and receives water supply from a sub-hose 13 arranged in parallel with the hard hose 2a. On the other hand, the sub-hose 13 communicates with the liquid chamber 5 of the powder suction device 1 through the filter 14, and the water W in the liquid chamber 5 is supplied to the spray nozzle 12. In addition, water W
It is the simplest to use the negative pressure generated in the connecting hose 2 as the power supply for the above. However, when the height difference between the liquid chamber 5 and the spray nozzle 12 is large, it is operated by the power of the vacuum motor 7. A liquid pump may be separately provided.

The wiping tool 3 is attached to the tip of the flexible hose 2b, and the flexible hose 2b is connected to the box-shaped hard case 3a. In the hard case 3a, the short side plate 3b has a substantially semi-cylindrical shape, and the curved side has a large opening, and a slightly elastic net plate 3c made of synthetic resin or metal is stretched over the opening surface. A thick wiping cloth 3d is attached to the mesh plate 3c. In addition, long hole-like suction holes 15 are formed on both side edges in the longitudinal direction on the opening surface of the hard case 3a. Generally, since the wiping device 3 is used by moving it in a direction parallel to the short side plate 3b, the suction hole 15 is oriented in a direction orthogonal to the wiping operation direction of the wiping device 3.

Furthermore, the wiping tool 3 is provided with a switch 16 for turning on and off the powder suction device 1. The switch 16 is of a touch type, for example, and is turned on by holding the hard case 3a by hand to operate the powder suction device 1. The switch 16 may be a micro switch, a reed switch, or an optical switch in which a light emitting element and a light receiving element are combined.
Of course, the switch 16 may be provided on the blackboard 9 side, and the switch 16 may be turned on by lifting the wiping tool 3.

Besides, reference numeral 17 in FIG. 1 is a powder receiver provided on the lower edge of the blackboard 9.

Next, a method of wiping off chalk on the blackboard 9 using a blackboard wiping device will be described. First, when the wiper 3 is held by hand, the switch 16 is touched by a finger, so that the powder suction device 1 is turned on and the motor 7 is operated to suck air. As a result, the inside of the hard case 3a of the wiping device 3 has a negative pressure and air is sucked through the suction holes 15. In this state, the wiping cloth 3d of the wiping tool 3 is pressed against the surface of the blackboard 9 as shown in FIG. At this time, wipe cloth 3d
Since the surface of the is curved in a semi-cylindrical shape and is slightly higher than the suction hole 15, the suction hole 15 is not blocked, and therefore, an excessive load is not applied to the motor 7. Next, when the wiping tool 3 is slid on the blackboard 9 in this state as shown by the arrow a in FIG. 4, the chalk powder P is accumulated between the surface of the blackboard 9 and the wiping cloth 3d. The chalk powder P accumulated here is sequentially sucked from the suction hole 15 of the wiping device 3, but is completely sucked from the suction hole 15 by sliding the wiping device 3 in the opposite direction as shown by arrow b in FIG. .

Next, the chalk powder sucked from the suction hole 15 flows from the flexible hose 2b to the hard hose 2a.
Since air is flowing at high speed toward the powder suction device 1 in the hard hose 2a, the tip of the spray nozzle 12 has a negative pressure, and the water supplied from the sub-hose 13 is hard hose 2a.
Is sprayed in. The mist-like water and chalk powder enter the liquid chamber 5 of the powder suction device 1 in a mixed state. Then, water drops drop toward the bottom of the liquid chamber 5, and the air enters the air chamber 6 through the filter 8. Of course, the chalk powder also tries to flow toward the air chamber 6, but is blocked by the filter 8. Therefore, only clean air that does not contain chalk powder or dust is discharged from the exhaust pipe 1b. In addition, although chalk powder is naturally mixed in the water W in the liquid chamber 5,
Since the filter 14 is installed at the connection portion of the sub hose 13, clean water is supplied to the spray nozzle 12.
If water is sprinkled into the hard hose 2a in this way,
Since the chalk powder is washed away, the hard hose 2a is not clogged indefinitely, and the maintenance is easy. In addition, the chalk powder attached to the wiping cloth 3d does not need to be cleaned because it is sucked from the cloth.

After the chalk on the blackboard 9 has been wiped as described above, the wiping tool 3 is placed on the powder receiver 17 of the blackboard 9 while returning the flexible hose 2b into the storage box 11.
When the switch 16 is released, the power is turned off and the powder suction device 1 is stopped. If the time until all the powder in the connection hose 2 is sucked into the powder suction device 1 is provided between the time when the switch 16 is turned off and the time when the powder suction device 1 is stopped, the connection hose can be provided. 2 is more difficult to clog. Also,
When chalk powder is accumulated in the liquid chamber 5, the liquid chamber 5 is removed and the chalk powder is discarded together with water.

Although the present invention has been described with reference to the embodiments, the present invention is of course not limited to the above embodiments. For example, in the embodiment, the structure in which the water W in the liquid chamber 5 is sprayed into the connection hose 2 is adopted, but a known vacuum cleaner may be diverted as it is. In particular, maintenance is easy if the powder is stored in the paper pack. Further, in the embodiment, the suction holes 15 of the wiping tool 3 are provided on both sides of the wiping cloth 3d, but the suction holes 15 are wiped with the wiping cloth 3d.
It may be formed also in the center of, or may surround the periphery of the wiping cloth 3d. Further, in the embodiment, the powder suction device 1 is installed under the floor of the building, but other than that, the powder suction device 1 may be installed indoors or outdoors such as under the blackboard 9. When the installation location is selected outdoors or under the floor of a building, other than indoors, the operation noise is not a concern. Furthermore, the blackboard 9 is not limited to being fixed to the wall surface, but is also applicable to a type that is fixed to the frame and is movable.

[0022]

In the blackboard wiping device of the present invention, since the wiped chalk powder is immediately sucked by the suction hole of the wiping tool, there is no possibility that the chalk powder will be scattered into the room, and therefore, the long-term wiping The air is kept clean even in lectures.
In addition, since the chalk powder does not scatter, there is no possibility that it will be deposited in the room, and therefore, there is an excellent effect that the room is less likely to become dirty.

Further, if the wiper is provided with a switch to turn the powder suction device on and off, the powder suction device can be operated only when necessary, thus significantly reducing the operating cost. In addition to being able to do so, driving noise is hardly noticeable.

Further, the suction hole of the wiping tool is formed in a long hole shape in a direction orthogonal to the wiping operation direction, and
If a plurality of wiping surfaces are provided so as to sandwich the wiping surface, chalk powder can be sucked with high efficiency in both directions in which the wiping tool is slid, and many excellent effects are exhibited.

[Brief description of drawings]

FIG. 1 is a front view showing an entire blackboard wiping device.

FIG. 2 is an exploded perspective view of a wiping tool.

FIG. 3 is a sectional view of the powder suction device.

FIG. 4 is a cross-sectional view of the wiping tool showing a usage state.

[Explanation of symbols]

 1 ... Powder suction machine 1a ... Suction port 2 ... Connection hose 3 ... Wiping tool 15 ... Suction hole 16 ... Switch

Claims (3)

[Claims] 1. A powder suction device, a connecting hose whose proximal end side is connected to a suction port of the powder sucking device, and at least a part of the distal end side has a flexible structure, and which is attached to the distal end of the connecting hose. And a wiping tool provided with a wiping surface for chalk on at least one surface, wherein the wiping tool is provided with a suction hole for powder so as to open on the back side or the side surface of the wiping surface. Blackboard wiping device. 2. The blackboard wiping device according to claim 1, wherein the wiping tool is provided with a switch for turning on and off the powder suction device. 3. The suction hole of the wiping tool is formed in a long hole shape in a direction orthogonal to the wiping operation direction, and
The blackboard wiping device according to claim 1 or 2, wherein a plurality of wiping surfaces are provided so as to sandwich the wiping surface.