KR20180063519A - Chalkboard eraser - Google Patents

Abstract

The present invention relates to a blackboard eraser which conveniently supplies water to a cloth by a simple operation of a hand and moves the cloth downwards. According to an embodiment of the present invention, the blackboard eraser comprises: a cover unit including a lower cover having a plurality of through holes, and an upper end cover forming first and second spaces above the lower cover; a belt unit having a belt wound on rollers in the lower space to move; a porous absorbent body which is arranged in the first space and absorbs water; and a water supply unit which has a plurality of protrusions formed on a lower portion thereof to be tightly inserted into the through holes, and is arranged on a lower portion of the absorbent body. The water supply unit slides and moves vertically in the first space.

Description

Chalkboard eraser {CHALKBOARD ERASER}

Disclosed herein is a board eraser capable of effectively erasing the chalkboard through a structure for supplying water to the lower part of the chuck.

Unless otherwise indicated herein, the description set forth in this identification section is not prior art to the claims of this application and is not to be construed as prior art as described in this identification section.

Conventionally, there has been an increase in the development of blackboard erasers that use water to prevent chalk from scattering for the health of students and teachers, although they have used blackboard erasers with dry, surface-area cloth to erase the chalk written on the surface of the blackboard .

However, as the water is stored in the eraser on the board, the stored water pressure often causes the water to flow outward, and the weight is increased, and excessive force is applied to erase the board, which requires a convenient board eraser to erase the board .

Korean Patent Registration No. 10-1375858 discloses an eraser for a water board that supplies water through the elasticity of a spring. Korean Patent Registration No. 10-0915780 discloses an eraser for a water board for preventing water from being wet by a hand, Discloses a water eraser.

However, the conventional inventions provide a technique for controlling the water supply and preventing the water from getting wet on the hand, but it does not disclose an invention that effectively reduces the amount of stored water and prevents the water from flowing out to the outside. If not used, it is necessary to effectively prevent water from leaking and conveniently put an appropriate amount of water on a cloth or mop of a blackboard eraser.

It is an object of the present invention to provide a blackboard eraser for easily supplying water to the mop and moving the mop downward through a simple operation of the hand.

Further, it is obvious that the present invention is not limited to the above-described technical problems, and another technical problem may be derived from the following description.

According to an embodiment of the disclosure, the board eraser includes a cover portion including a lower cover on which a plurality of through holes are formed and an upper cover that forms first and second spaces on the lower cover, A porous absorber disposed in the first space and absorbing water, and a plurality of protrusions formed in a lower portion of the absorber so as to be closely inserted into the through holes, And the water supply portion slides upward or downward within the first space.

In addition, when the water supply portion rises, the absorber is compressed, and the water in the absorber can be moved downward through the holes as the holes are opened.

The apparatus may further include a driving unit disposed in the second space and configured to be engaged with the belt unit through gears.

According to one embodiment of the present disclosure, the blackboard eraser can easily supply water to the lower mop and the lower mop conveniently by moving a simple finger while holding the board.

In addition, an absorber for absorbing water is disposed inside, and water is always stored and stored in the absorber to prevent the water from flowing to the outside, and the degree of shrinkage of the absorber can be adjusted, so that the amount of water supplied to the mop can be adjusted.

In addition, water can be injected in accordance with the amount of water absorbed by the absorber, and water can be injected through the injection port whenever necessary, without needing to store an excessive amount of water in order to wet the mop attached to the bottom, Can be erased.

It can also have other effects besides the effects of weight reduction, ease of drive and convenience.

1 is a perspective view of a blackboard eraser according to an embodiment of the present invention;
Fig. 2 is an exploded perspective view showing the internal space of the blackboard eraser of Fig. 1; Fig.
FIGS. 3 and 4 are exploded perspective views illustrating the operation of the switch portion of FIG. 2;
Figures 5 and 6 are exploded perspective views of the driving part and the belt part of Figure 1;

Hereinafter, the configuration, operation, and effects of the blackboard eraser according to the preferred embodiment will be described with reference to the accompanying drawings. For reference, in the following drawings, each component is omitted or schematically shown for convenience and clarity, and the size of each component does not reflect the actual size, and the same reference numerals denote the same components throughout the specification. And reference numerals for the same components in individual drawings are omitted.

1 shows a perspective view of a blackboard eraser according to an embodiment of the present invention.

1, the blackboard eraser 100 includes a cover portion 120, a belt portion 140, a switch portion 160, and a driving portion 180. As shown in FIG.

The cover portion 120 includes a lower cover 121, a top cover 122, and a water injection plate 123.

The eraser (100) on the board is designed to solve the problem of dusting on the board by combining the wipes at the bottom and supplying water from the top to the mop by user's operation, have.

The cover 120 is formed in the shape of a cover so that the dust removed by the mop coupled to the lower portion is not blown, the space for storing water at the upper portion, and the space for storing water at the upper portion, A device for supplying water to the mop is disposed.

The lower cover 121 is formed in a cover shape in which both sides are bent downward and a belt portion 140 is detachably attached to the lower cover 121 at a lower portion thereof. Can be attached.

The upper cover 122 is detachably coupled to the upper portion of the lower cover 121, and a plurality of spaces are formed therein to store water or to supply water according to a user's operation.

The water injection plate 123 is formed in the form of a cover that opens or closes a through hole connecting the space inside the top cover 122 and the outside. When the water falls inside the top cover 122, So that water can be injected through the through hole.

The belt portion 140 is disposed in a lower space formed at a lower portion of the lower cover 121 and rotates the rollers about the portion of the lower cover 121 that is bent downward from both sides of the lower cover 121, .

The belt 140 is detachably attached to the lower cover 121. The belt 140 is detached and attached to the belt so that the belt 140 is coupled to the lower cover 121, Or by attaching or detaching it.

The switch part 160 is partially formed in the inner space of the top cover 122 and the other end is formed to protrude outward through the both side surfaces of the top cover 122. The other end surface is flat .

The switch unit 160 is connected to a water supply unit to be described later formed in the inner space of the top cover 122 and is pressed toward the inside of the top cover 122, And supplies the water stored in the inside of the mop 122 to the mop.

The driving unit 180 is formed in the inner space of the top cover 122 so that a plurality of gears of different sizes are connected to each other. One of the gears protrudes outward through a groove formed in the front of the top cover 122 And is rotatable by the operation of the user.

One of the gears rotated by the operation of a gear projected to the outside and disposed inside the top cover 122 is engaged with the thread of the roller exposed to the outside of the belt portion 140 to rotate the gear The roller of the belt portion 140 rotates.

Accordingly, when the water supplied from the water supply unit formed in the upper cover 122 wets the mop attached to the upper end of the belt unit 140, the user operates the gear of the driving unit 180 protruding to the outside, It is possible to move the lower part of the belt part 140 and erase the black board which has been written using a mop conveniently wiped with water.

Fig. 2 is an exploded perspective view showing the internal space of the blackboard eraser of Fig. 1. Fig.

2, the board eraser 100 further includes an absorber 150, a water supply unit 170, and an adjustment unit 200. [

The inner space of the upper cover 122 is divided into a first space 10 and a second space 20 so that water can not be moved between the first space 10 and the second space 20. The first space 10 has an absorber 150, The water supply unit 170 and the adjustment unit 200 are disposed in the first space 160 and the driving unit 180 is disposed in the second space 20. [

The absorber 150 may be made of a porous polymer or a natural material. The absorber 150 is formed so as to have a sponge characteristic that shrinks when pressure is applied from the upper or lower portion, returns to the original state when pressure is recovered, and water is easily absorbed.

The water supply part 170 is formed in a plate shape and is not shown in the figure, but a plurality of protrusions are formed in the lower part, and are closely disposed to the lower part of the absorber 150, and both side surfaces are in close contact with the switch part 160.

The water supply unit 170 includes a pressure plate 171 and a guide plate 172.

The pressure plate 171 is formed in the shape of a plate, the protrusions are disposed at the bottom, and the absorber 150 is disposed closely to the upper surface.

One end of the guide plate 172 is coupled to each of opposite side surfaces of the pressure plate 171 and the other end extends a predetermined distance toward the outside of both sides. A slant surface is formed so as to be elongated toward the center.

One end of the switch portion 160 is closely attached to the inclined surface and when the switch portion 160 is pressed toward the absorber 150 to move the pressure portion through the guide plate 172 pushed upward by the inclined surface, Moves upward and the pressure plate 171 compresses the absorbent body 150 and water flows out from the absorbent body 150 to the outside.

The water flowing down to the outside flows down into a space formed between the pressure plate 171 and the upper cover 122 and flows through the through holes through the lower cover 121, Move to this mop.

The switch unit 160 is disposed on both sides of the top cover 122 and is configured to add or reduce the number of the switch units 160 disposed on both sides of the top cover 122 relatively to the size of the blackboard eraser 100 .

In this case, the number of the switch parts 160 disposed on both side surfaces of the upper cover 122 are kept the same, and the pressure of the switch part applying pressure from both sides acts on both sides of the pressure plate 171, 150 so that the water flows down effectively.

The adjustment portion 200 is formed to be disposed on the upper portion of the pressure plate 171 and protrude toward the side surface of the absorber 150 on the inner surface of the upper cover 122 of the cover portion 120, And extends toward the upper portion of the pressure plate 171 of the pressure plate 171 to be in contact with the upper portion of the pressure plate 171.

When the guide plate 172 is moved upward by pressing the switch unit 160, the pressure plate 171 compresses the absorber 150 to allow the water to flow down, and the water flowing downward flows through the pressure plate 171 and the upper cover 122, When the user returns the pressure applied to the switch unit 160, the elasticity of the spring of the adjustment unit 200 causes the pressure plate 171 to return to the original position and the water flows into the mop Falling stops.

The driving unit 180 includes a first connecting gear 181, a second connecting gear 182, a gear shaft 183, and an adjusting gear 184.

The first connection gear 181 is disposed on one side of the second space 20 and a part of the first connection gear 181 passes through a groove passing through the lower cover 121 so as to be engaged with a thread exposed on the side surface of the roller formed on the belt portion 140 .

Accordingly, when the belt portion 140 is driven, the roller of the belt portion 140 rotates and the first connecting gear 181 simultaneously rotates in the rotating direction of the roller.

One of the second connection gears 182 is configured to engage with the first connection gear 181 and the other is connected to an adjustment gear 184 configured to protrude out of the top cover 122.

The adjustment gear 184 is rotatably coupled to a gear shaft 183 having both ends connected to the inner walls of the top cover 122 inside the second space 20 and the adjustment gear 184 is rotated The first and second connecting gears 181 and 182 rotate and the belt portion 140 rotates.

Accordingly, the user can conveniently adjust the adjusting gear 184 with his / her finger while holding the board eraser 100, thereby moving the wetted mop to the lower portion of the belt unit 140, The mop can be prevented from being moved by the belt 140 while the wet board is moving.

Figures 3 and 4 show exploded perspective views illustrating the operation of the switch portion of Figure 2.

As shown in Figs. 3 and 4, the switch portion 160 includes a switch 161 and a sealing unit 162. Fig.

The other end of the switch 161 is protruded toward the outside of the upper cover 122 through the upper cover 122 and the other end of the switch 161 is pressed by a finger As shown in FIG.

Bar-shaped guide bars are formed on both sides of the switch 161, and the guide bars are slidably engaged with the top cover 122.

The sealing unit 162 is slidably coupled to the switch 161 through a guide bar in the form of a bar formed on a side surface of the switch 161 and seals a space formed at the top and bottom of the switch 161 Thereby preventing water stored in the first space 10 from flowing down along the switch 161 to the outside.

When the switch 161 is moved toward the absorber 150 by the user, the guide plate 172 is moved upward by pressing the inclined surface of the guide plate 172 and the pressure plate 171 is simultaneously moved upward by a predetermined distance Move.

The protrusions 173 formed on the lower portion of the pressure plate 171 inserted into each of the plurality of through holes 124 formed through the lower cover 121 from the upper portion to the lower portion move as the pressure plate 171 moves upward, And the through holes 124 are opened.

In this case, water generated in the absorber 150 moves to the pressure plate 171, and water flows through the space formed between the pressure plate 171 and the upper cover 122 into the through holes 124, ).

When enough water moves to the belt part 140, the user withdraws the pressure applied to the switch 161, and the pressure plate 171 moves downward by the adjusting part 200 and returns to the original position.

Each of the protrusions 173 is inserted into each of the through holes 124 while the pressure plate 171 is returned to the original position and the water remaining in the first space 10 is moved to the belt portion 140 through the through holes 124 .

Accordingly, the user can move the pressure plate 171 upward while moving the pressure plate 171 in a simple manner by pressing the switches 161 formed on both sides, so that the water can flow down from the absorber 150, 124) have the advantage of wetting the mop.

In addition, the pressure plate 171 is automatically returned to its original position through the regulating unit 200, and water is normally stored through the absorber 150 to prevent water from flowing to the outside, There is an advantage that water proportional to the magnitude of the pressure applied to the switch 161 is supplied only when it is desired to supply.

Figures 5 and 6 show an exploded perspective view of the drive and belt portions of Figure 1.

5 and 6, the belt portion 140 includes a first roller 141, a second roller 142, a belt 143, and a fixing plate 144. As shown in FIGS.

5 and 6 are exploded to be disposed between the lower cover 121 and the belt 140 to explain the structure of the belt 180 connected to the belt 140, 100 are disposed in the second space 20 above the lower cover 121 in the completed structure.

The roller 141 and the second roller 142 are formed in a cylindrical shape with threads formed along the outer surface and are spaced apart from each other at a predetermined interval in front of and behind the lower space of the lower cover 121.

The thread of the first roller 141 is formed to engage with the thread of the first connecting gear 181 and the thread of the first connecting gear 181 is connected to the second connecting gear 182 disposed in the second space 20, And the thread of the other one of the second connecting gears 182 is connected to the thread of the adjusting gear 184. [

Accordingly, the user can rotate the first roller 141 by rotating the adjusting gear 184, and the user can grasp the blackboard eraser 100 by gripping the water moped on the water attached to the belt 143, So that it can be easily moved toward the lower portion of the belt portion 140.

The belt 143 is formed so as to surround the first roller 141 and the second roller 142 and is formed on the inner surface of the belt 143 to be engaged with the threads of the first and second rollers 141 and 142 The first roller 141 and the second roller 142 move along the rotational direction when they are rotated.

The fixing plate 144 is disposed on a part of the outer surface of the belt 143 and is fixed to the belt 143 when the user removes the belt 140 and fixes the rag to the belt 143. [ And protrusions are formed to generate a frictional force between the rag and the belt (143).

When the user moves the blackboard eraser 100 along the surface of the blackboard after the user grips and fixes the adjustment gear 184 with the finger through the fixing plate 144 and prevents the slider from sliding off the belt 143 To effectively wash the blackboard.

Accordingly, the user can move the water having a different amount depending on the magnitude of the pressure that presses the switch 161 to the lower portion of the lower cover 121, so that the water can be wetted on the mop and the pressure applied to the switch 161 can be recovered To prevent water from flowing down automatically.

The mop fastened to the water can be moved to the lower portion of the belt 140 through the adjusting gear 184 protruded to the upper portion of the upper cover 122, And thus it is advantageous to prevent slippage from being separated from the slider 143.

In addition, since an appropriate amount of water is absorbed through the absorber 150, water is prevented from flowing out through the gap of the upper cover 122, and the size of the absorber 150 to be contracted can be adjusted, There is an advantage that the amount of water can be controlled.

In addition, it is possible to inject water by judging the amount of water absorbed by the absorber 150 without needing to store excessive water for wetting the mop inside the upper cover 122, thereby reducing the overall weight of the board eraser 100 There are advantages.

When the blackboard eraser 100 is not used, the protrusions 173 are closely inserted into the through holes 124 so that the pressure of the water stored in the second space 20, or the user's mistake, It is advantageous to effectively prevent leaking.

In addition, the surface area of the rag attached to the belt 143 is relatively increased as compared with the blackboard eraser used by attaching only one mop, and the adjusting gear 184 can be rotated by the finger to use a wide area rag, There are advantages to using on the board.

The second coupling gear 182 may include one or more gears other than the two gears illustrated in the figure, and may include a control gear 184 and a first coupling gear 181 Can be connected.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken in conjunction with the present invention. It is to be understood that various equivalents and modifications may be substituted for those at the time of the present application. It is to be understood, therefore, that the above description is intended to be illustrative, and not restrictive, and that the scope of the present invention will be defined by the appended claims rather than by the foregoing description, All changes or modifications that come within the scope of the equivalent concept are to be construed as being included within the scope of the present invention.

10: first space 20: second space
100: board eraser 120: cover part
140: belt part 150: absorber
160: switch unit 170: water supply unit
180: driving unit 200:

Claims (9)

A cover portion including a lower cover having a plurality of through holes formed therein and a top cover forming first and second spaces above the lower cover;
A belt portion in which a belt wound on the rollers to move in the lower space is formed;
A porous absorber disposed in the first space and absorbing water; And
And a plurality of projections each formed at a lower portion thereof so as to be closely inserted into each of the holes, and a water supply portion disposed at a lower portion of the absorbent body,
Wherein the water supply part slides upward or downward in the first space.
The method according to claim 1,
Wherein when the water supply part rises, the absorber is compressed and water in the absorber moves down through the through holes as the through holes are opened.
The method according to claim 1,
Further comprising a driving unit connected to the plurality of gears to be disposed inside the second space, wherein one gear is engaged with the roller and the other gear is formed to protrude to the outside of the top cover. .
The apparatus as claimed in claim 3,
Connecting gears, some of which rotate in engagement with the rollers; And
And an adjusting gear which is engaged with one of the connecting gears and protrudes to the outside of the upper cover.
The method according to claim 1,
Further comprising an adjuster formed on the cover to protrude toward the absorber and a spring extending downward from the upper surface of the water supply unit.
The water treatment system according to claim 1,
A pressure plate in which protrusions are formed at a lower portion and the upper surface is in contact with the absorber; And
And a guide plate coupled to the side surface of the pressure plate, the outer side surface forming an inclined surface such that the upper surface extends relatively longer than the bottom surface.
The method according to claim 6,
Further comprising a switch unit which is in contact with an inclined surface of the guide plate through a side surface of the upper cover, on a side surface of the water supply unit.
8. The apparatus according to claim 7,
A switch which is in close contact with the inclined surface and protrudes outside the upper cover; And
And a hermetically-sealed unit slidingly coupled to the switch, the hermetically-sealed unit sealing the upper surface of the switch and the outer surface of the switch.
9. The method of claim 8,
Wherein when the switch is moved toward the absorber, the pressure plate is pressed upward to press the absorber, the through holes are opened, and water stored in the absorber moves to the belt portion through the through holes.

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