CN2271445Y - Dustless writing training aid - Google Patents

Abstract

The utility model relates to a dustless writing training aid, which is used for writing in teaching. The utility model is composed of a writing pen, an eraser, and a writing board. The utility model is characterized in that the writing pen contains a kind of water-soluble liquid with a color (writing liquid); when words written on the writing board need to be erased, color fading liquid which is mainly made of alcohol is filled in the eraser, and the color fading liquid makes a contact with the written words by the surface of erasing material, and the words are change into colorless words. Because the alcohol can be volatilized fast, words can be written on the surface instantly. The utility model has the advantage that the whole teaching process has no dust, achieving the purpose of teaching without dust.

Description

The dust-free writing teaching aid

The utility model relates to a kind of chalk that uses, blackboard eraser and blackboard in teaching writing.

In existing teaching writing, all be to go up writing words etc. at the metal that scribbles black or green paint film, glass or wooden blackboard (being clipboard) with chalk, wipe the writing of chalk with blackboard eraser.Chalk is after writing on the blackboard, and in the time of wiping, its dust flies upward everywhere, pollutes teaching environment, and the infringement teachers and students' is healthy.And the root of contaminated environment to be chalk write powder that the back produced.In recent years, listings such as carrying out improved micronic dust chalk from chalk is arranged, write defect such as painstaking according to thinking after the actual use of teacher to exist, and the pollution of dust is not significantly improved.

The purpose of this utility model provides a cover dust-free writing teaching aid, with lettering pen writing words etc. on white or other light clipboard, the writing of writing is to be made of the coloured liquid of writing, when eraser is wiped writing, writing becomes colourless even the lip-deep liquid that fades of its wiping material contacts with the writing of being write, have suffered equal no dust pollution source in the teaching process, realize the purpose of no dust pollution writing and teaching.

The purpose of this utility model is achieved in that

Drawn colored liquid in the lettering pen, writing words on clipboard, the liquid that fades is equipped with in the eraser the inside, and when wiping writing, it is wiped the lip-deep liquid that fades of material and contacts the material even its writing becomes colorless with the literal of being write.

Lettering pen is by writing liquid, pen core, nib, shell, the pen plug, the pen cap is formed, pen core draws material by the cavernous body that can draw a lot of liquid etc. and the book Membrane cover constitutes, cavernous body etc. is drawn material be contained in book Membrane cover the inside, insertion is write in the liquid, cavernous body draws material and draws automatically and write liquid, pen core is contained in a shell the inside, at pack into pen plug of one end, the other end insertion cavernous body of nib from a shell drawn the material, when writing, the liquid of writing that cavernous body draws in the material supplies to write usefulness to the nib transmission, the pen cap is enclosed within on the shell of a written end when not using, and prevents that the liquid of writing on the nib from outwards volatilizing withered.Writing liquid is can dissolve, meet the liquid of writing that liquid such as weak acid or weak base can be broken down into colourless colored pigment formation different colours with meeting water or alcohol, be about to easily to be decomposed into colourless ground pen and write the ethereal blue ink of usefulness and write liquid as blueness by weak base, or with blue pigments such as barba hispanicas, reach other and easily be decomposed into other colourless colored pigment and be dissolved in water or spill the liquid of writing of promptly making different colours in the essence by weak-alkaline and weak-acidic etc.Eraser is drawn material, limit liquid layer, is wiped material, shell, enclosing cover etc. and form by the liquid that fades, the cavernous body etc. that can draw a lot of liquid, cavernous body etc. is drawn the innermost layer that material is contained in shell, on shell, be drilled with a hole, making the liquid that fades can be injected into cavernous body from the hole draws in the material and goes, the limit liquid layer be contained in cavernous body draw material above, hinder and the restriction liquid that fades is transferred to the amount that material goes of wiping, wipe the surface that material is contained in the limit liquid layer.During use, the liquid that fades that cavernous body draws in the material is sent to the total amount that wiping material surface is gone through the control of limit liquid layer, make and wipe material lip-deep fade liquid and the literal of being write etc. and contact, make it the material that becomes colorless, because of alcohol volatilization is fast, can be immediately writing words, not time spent again in its surface, enclosing cover is enclosed within to cover on the shell wipes material, make that to wipe the lip-deep liquid that fades of material not volatile withered.Fade liquid by with alcohol dilution alkali or acidic liquid material, become weak base or weak acid solution, it is harmless and contact with the writing of writing that can make it becomes colorless is as the criterion that the concentration of dilution is controlled at skin to human body.Clipboard and former blackboard are same or similar, promptly make of glass, metal, timber, plastic or other material, change the paint film of the dark paint films such as black of former blackboard for white or other face light color.

The utility model has the following advantage and effect: get for chalk with lettering pen and write, writing liquid is water-soluble pigment, the writing of being write is not to constitute with a lot of powdered materials, and the liquid that fades when wiping contacts with the writing of writing liquid, can make its writing become colourless shape.And can be immediately writing words again, stop the dust source and do not have the dust from flying contaminated environment, realize the purpose of dustless teaching.

Introduce the structure of utility model below in conjunction with accompanying drawing:

Fig. 1 is the lettering pen structure chart.

Fig. 2 is the eraser structure chart.

With reference to accompanying drawing: lettering pen (Fig. 1), eraser (Fig. 2), pen core (1), nib (2), a shell (3), pen plug (4), the pen cap (5), cavernous body etc. draw material (6), limit liquid layer (7), wipe and expect (8), shell (9), enclosing cover (10), hole (11).

Pen core (1) draws material by the cavernous body that can draw a lot of liquid etc. and the film cover constitutes, cavernous body draws and has drawn coloured liquid of writing in the material, pen core (1) is contained in the inside of a shell (2), the end that pen plug (4) is contained in a shell (3) can not withdraw from pen core, cavernous body that nib (2) is inserted pen core (1) the inside from the other end of a shell (3) draws to go the material to draw writes liquid, and the pen cap (5) is enclosed within the shell (3) that nib (2) one ends are housed and goes up and constitute lettering pen (Fig. 1).

The layer when cavernous body that can draw a lot of liquid draws material (6) and is contained in shell (9), having a hole (11) on shell (9) makes the liquid that fades can be injected into cavernous body from hole (11) to draw material (6) the inside, to limit liquid layer (7) to be contained in cavernous body draws above the material (6), the liquid that fades that the restriction cavernous body draws in the material (6) is sent to how many degree that material (8) surface is gone of wiping, wipe material (8) and be contained in the surface of limitting liquid layer (7), enclosing cover (10) is enclosed within the top of shell (9) and covers wiping material (8), makes to wipe the not volatile withered and formation eraser (Fig. 2) of the lip-deep liquid that fades of material.

Claims (2)

1 one kinds of dust-free writing teaching aids that in teaching writing, use, liquid, pen core, nib, a shell, a plug, the pen cap and the liquid that fades, cavernous body draw material, limit liquid layer, wipe material by writing, shell, enclosing cover are formed, it is characterized in that: pen core is contained in a shell the inside after drawing and writing liquid, nib is drawn the material from the end insertion cavernous body of a shell, at the other end of a shell pen plug is installed, the pen cap is enclosed within the lettering pen that constitutes on the shell of a written end in the dust-free writing teaching aid; Cavernous body is drawn material is contained in the innermost layer of shell, the limit liquid layer be contained in cavernous body draw material above, wipe the surface that material is contained in the limit liquid layer, enclosing cover is enclosed within to cover on the shell and wipes material and constitute eraser in the dust-free writing teaching aid.

2 according to claims 1 described dust-free writing teaching aid, it is characterized in that: be drilled with an aperture on the shell of eraser, the liquid that will fade is injected into cavernous body and draws in the material and go from the hole.

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