JPH0668887U - Blackboards that prevent the scattering of powder - Google Patents

Abstract

(57) [Summary] [Purpose] To provide blackboards that prevent the adverse effects of powder generated from blackboards (including green boards and white boards). [Structure] A frame member 4 is fitted and attached to the periphery of the board 3. When the eraser 2 is moved in the direction of the arrow a to perform the wiping operation, even if the eraser 2 is roughly handled, the eraser may get over the frame member as shown by the chain line arrow c and the mower 2a of the eraser may be rubbed against the ridge of the frame member. A wall surface 4a is provided on the frame member 4 so as not to exist. The height h of the wall surface is 15 mm or more.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a blackboard which is improved so that the powder or the like drawn on a writing surface of the blackboard with a writing instrument for the blackboard does not scatter when wiped with an eraser. In the present invention, the blackboards collectively mean so-called blackboards, white boards and green boards. Therefore, when we say writing instruments for blackboards, we generally refer to chalk and marker pens.

[0002]

[Prior art]

 3A and 3B show conventional examples of blackboards, where FIG. 3A is an overall perspective view, FIG. 3B is a cross-sectional view near the frame, and FIG. The board 1a is mainly responsible for the function as a blackboard, that is, the function of immediately marking with a writing instrument, erasing with an eraser and restoring to a reusable state. In the past, the boards used were so-called blackboard-painted wooden boards, and the color tone was mostly black or green, and the dark tone was used to clarify the whiteness of chalk. Since then, iron plates have come to be used to magnetically attract magnetic buttons, and wooden plates or synthetic resin plates (for example, foam styrene plates) with a thin iron plate attached to reduce weight are used. Became. In addition, the technique of marking with a marker pen was developed, and boards with white or a coating close to white were used. A frame 1b is attached to the periphery of the board 1a with attachment screws 1d. The role of the frame 1b is to improve the product value by first arranging the design, and secondly, it is functional to attach a hanging ring or legs. In addition, it also has the role of protecting the board 1a and the safety of the user. Then, the powder receiver 1c is attached below the board 1a. The original role of this powder receiver is to receive the powder that falls when the board 1a is wiped with the eraser 2, but it is also used as a storage area for erasers and writing instruments (white ink, marker pens, etc.). There is.

[0003]

[Problems to be solved by the device]

 In the era when chalk was mainly used as a writing instrument for blackboards, a large amount of chalk powder was generated when the board was wiped with an eraser, so cleaning it required a lot of labor. However, since marker pens have been mainly used as writing instruments, the labor required to dispose of generated powder has been significantly reduced. For this reason, there was a time when I had the illusion that “I started to write with a marker pen on a whiteboard, and I no longer have to worry about disposing of powder.” However, among blackboards, whiteboard-based ones have become diversified in offices, while furniture and interiors in offices have become more sophisticated, and the harmful effects of powder generated from blackboards have become a problem. Became. Although white ink powder is white, although it is often generated, it was easy to remove it by wiping or tapping it, whereas marker pen is often used in blue, red, black, etc. Since the color tone of the powder that is generated is dark, the actual damage is significantly greater than the amount of powder that is generated. The present applicant, who is the leader in the industry as a manufacturer of blackboards, and the inventor, who is the technical staff thereof, repeated tests and studies to reduce the damage of powder generated from blackboards. "The most effective way to reduce the damage of powder generated from blackboards is to clean the eraser frequently and keep it clean at all times." The generated foreign matter once adheres to the eraser mohair, and when the accumulated amount reaches a certain amount, it peels off and becomes powder, so if it is removed while adhering to the mohair, scattering of the powder is prevented. You can do it. From these viewpoints, the present inventors have invented an eraser automatic purifier and have filed a separate application. However, subsequent research confirmed that powder may be scattered from the eraser before the eraser is automatically cleaned by the eraser's automatic cleaner. FIG. 4 is an explanatory view of a state in which powder is scattered from the eraser at the moment when the wiping of the board surface is completed. The eraser 2 wipes the notation surface of the board 1a while holding it by hand and reciprocating it as indicated by arrows a and b. However, since the dimension d shown in the figure is generally about 5 mm, the momentum is excessive, and as indicated by the chained arrow c There is a risk of getting over the frame 1b. When the frame 1b is thus crossed over, the mohair 2a of the eraser 2 is rubbed against the ridge of the frame 1b to generate powder. The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide blackboards which are free from the possibility that powder will be scattered from mohair rubbed against a frame even if an eraser is handled roughly. And

[0004]

[Means for Solving the Problems]

 As described above with reference to FIG. 4, powder is generated when the eraser 2 crosses over the frame 1b as indicated by the chain line arrow c. Therefore, a wall surface with a height of 15 mm or more is formed so as to prevent the movement of the arrow c. Set up. However, the height in this case does not mean the distance from the center of the globe, but the distance from the writing surface of the blackboard.

[0005]

[Action]

 According to the above configuration, since a wall with a height of 15 mm or more is provided around the writing surface of the blackboard, even if the eraser is handled roughly, it will not be obstructed by the wall and will not get over the frame. . Therefore, there is no possibility that the eraser mohair is rubbed against the frame of the blackboard to generate powder.

[0006]

【Example】

 FIG. 1 shows an embodiment of a blackboard and the like according to the present invention in which the scattering of powder is prevented, and an external view of an eraser is added to the cross-sectional view near the frame for explaining the configuration, operation and effect. Is. FIG. 2 is a sectional view taken along a plane perpendicular to the longitudinal direction, showing a frame member in a blackboard or the like which prevents the powder from scattering according to the above embodiment. Next, this embodiment will be described with reference to FIGS. (See FIG. 1) A frame member 4 is attached to the peripheral portion of the board 3. In this embodiment, the frame members 4 are attached to the left and right edges (vertical edges) of the board and the upper edge (horizontal edge) of the board. The wall surface 4a is formed on the frame member 4 so that when the eraser 2 moves in the direction of the arrow a, there is no risk of overpowering the frame as shown by the arrow c. In this example, the height dimension h of the wall surface 4a is 15 mm. In implementing the present invention, if the height dimension h is insufficient, sufficient effect cannot be obtained, so it is necessary to set h> 15 mm.

As shown in FIG. 2, the frame member 4 of this example has a portion 4b having a U-shaped cross section, and is prevented from slipping out inside the two parallel sides (two horizontal sides in FIG. 2) of the U-shape. The tooth 4c is provided and is integrally formed of an elastic synthetic resin material (vinyl chloride in this example). When the board 3 is press-fitted into the U-shaped portion 4b as shown in FIG. 1, it does not come off due to the action of the retaining teeth. This eliminates the need for a mounting screw, reduces the man-hours required for screwing in the mounting screw, and facilitates assembly work. Reference numeral 4d shown in FIG. 2 is an engaging recess for assembling the vertical frame member and the horizontal frame member. As shown in FIG. 1, the wall surface 4a of this example is not a right angle to the writing surface of the board 3 but an obtuse angle. The inclination of the wall surface 4a is provided in order to improve the design, and to improve the compatibility of the parts with the powder receiver. Specifically, the frame member 4 and the powder receiver (not shown) are designed so that they can be extrusion-molded (injection-molded) with the same mold. The illustrated dimension e is 8 mm in this embodiment.

[0008]

[Effect of device]

 When the present invention is applied, since a wall having a height of 15 mm or more is provided in the peripheral portion of the writing surface of blackboards, even if the eraser is handled roughly, it will not be obstructed by the wall and will not get over the frame. . Therefore, there is an excellent practical effect that there is no possibility that the eraser mohair is rubbed against the frame of the blackboard to generate powder.

[Submission date] April 9, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

[Prior art]

3A and 3B show conventional examples of blackboards, where FIG. 3A is an overall perspective view, FIG. 3B is a cross-sectional view near the frame, and FIG. The board 1a is mainly responsible for the function as a blackboard, that is, the function of immediately marking with a writing instrument, erasing with an eraser and restoring to a reusable state. In the past, the boards used were so-called blackboard-painted wooden boards, and the colors used were mostly black or green, and dark colors were used to clarify the whiteness of chalk. Subsequent advances, the magnetic button is as iron is used so as to magnetic attraction, is used that is adhered to a thin plate of iron wood board or synthetic resin plate for weight reduction (e.g., foamed Suchiro Le plate) It became so. In addition, the technique of marking with a marker pen was developed, and boards with white or a coating close to white were used. A frame 1b is attached to the periphery of the board 1a with attachment screws 1d. The role of the frame 1b is to improve the product value by first arranging the design, and secondly, it is functional to attach a hanging ring or legs. In addition, it also has the role of protecting the board 1a and the safety of the user. Then, the powder receiver 1c is attached below the board 1a. The original function of this powder receiver is to receive the powder that falls when the board 1a is wiped with the eraser 2, but it is also used as a storage space for erasers and writing instruments (white ink, marker pens, etc.). There is.

[Brief description of drawings]

FIG. 1 is one of blackboards according to the present invention which prevents scattering of powder.
It is a figure which added the external view of the eraser to the cross-sectional view of a frame vicinity in order to demonstrate the Example, its structure, an effect | action, and an effect.

FIG. 2 is a cross-sectional view showing a frame member in a blackboard or the like in which the powder is prevented from scattering according to the above-mentioned embodiment, and which is a plane perpendicular to the longitudinal direction.

3A and 3B show conventional examples of blackboards, where FIG. 3A is an overall perspective view, FIG. 3B is a sectional view near the frame, and FIG. 3C is a sectional view near the dust receiver.

FIG. 4 is an explanatory view of a state in which powder is scattered from the eraser at the moment when the wiping of the board surface is completed.

[Explanation of symbols]

1 ... Blackboards, 1a ... Board, 1b ... Frame, 1c ... Powder receiver, 2
... eraser, 2a ... mohair, 2b ... eraser cover, 3 ... board, 4 ... frame member, 4a ... wall surface, 4b ... section with U-shaped cross section, 4c ... retaining tooth, 4d ... engaging recess.

Claims (3)

[Scope of utility model registration request] 1. A height dimension 1 is provided on the periphery of the marking surface of a blackboard.
Blackboards that prevent powder from scattering, characterized by having a wall surface of 5 mm or more. 2. The wall surface is formed on a frame member, and the frame is a member made of a synthetic resin having elasticity and having a U-shaped cross section to be fitted to an edge of a board. When,
The blackboards according to claim 1, characterized in that the blackboards according to claim 1 are provided with retaining teeth inside two parallel sides of the U-shaped section. 3. The blackboards according to claim 1, wherein the wall surface forms an obtuse angle with respect to the writing surface of the blackboards.