CN202293828U - Residual chalk reusing sleeve - Google Patents

Abstract

The utility model discloses a residual chalk reusing sleeve, which comprises a sleeve body, a base which is provided with a spiral sliding rail, and a cylindrical outer sleeve with diameter which is slightly larger than the diameter of chalk. A threaded sleeve is arranged at the bottom of the outer sleeve, is fit with the spiral sliding rail on the base and can freely slide to a certain degree. The residual chalk reusing sleeve has the advantages and positive effects that the structure is simple, the residual chalk reusing sleeve is convenient to use, safe and hygienic, the energy is saved and the hands of a user can be enabled to be not stained by dust.

Description

The chalk head is again with cover

Technical field

The utility model relates to a kind of teaching aid, relates in particular to a kind of chalk head again with cover.

Background technology

Chalk is teacher's necessary tool of teaching, and in the prior art, manyly abandons because be inconvenient to use with short chalk heads, causes serious waste; If be inserted in the chalk head in the common chalk sleeve,, use also inconvenient because bad fixing.

Summary of the invention

The utility model provides a kind of chalk head again with cover for solving the technical problem that exists in the known technology, is used to solve the problem that the common flour pen cap can't make full use of the chalk head.

For achieving the above object; The utility model chalk head with cover, comprises body again, is provided with base and the diameter of the helical form slide rail cylindrical jacket than chalk somewhat larger in diameter, and this jacket bottom is provided with thread bush; Chimeric each other with the helical form slide rail on the base, can in to a certain degree, be free to slide.

Advantage and the good effect that the utlity model has are: health simple in structure, easy to use, safe, and save the energy, can also let the user point and not be stained with dust.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Among the figure: 1, overcoat, 2, body, 3, base.

The specific embodiment

For further understanding summary of the invention, characteristics and the effect of the utility model, the following examples of giving an example now, and conjunction with figs. specifies as follows:

The described a kind of chalk head of the utility model is again with cover; As shown in Figure 1; Comprise the cylindrical jacket 1 and body 2 of diameter than chalk somewhat larger in diameter, said body 2 bottoms are connected with the base 3 of helical form slide rail, and above-mentioned overcoat 1 is provided with thread bush; Chimeric each other with the helical form slide rail on the base 3, can in to a certain degree, be free to slide.

The concrete use of the utility model is: insert overcoat 1 to the chalk head, rotating base 3 then, and overcoat 1 is screwed out in body 2, and can use chalk this moment.

More than the specific embodiment of the utility model is specified, but said content is merely the preferred embodiment of the utility model, can not be considered to be used to limit the practical range of the utility model.All equalizations of doing according to the utility model application range change and improve etc., all should still belong within the patent covering scope of the utility model.

Claims (1)

1. a chalk head with cover, comprises body again, the base and the diameter that are provided with the helical form slide rail be than the cylindrical jacket of chalk somewhat larger in diameter, and it is characterized in that: jacket bottom is provided with thread bush, and is chimeric each other with the helical form slide rail on the base.

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