CN202480621U - Chalk sleeve - Google Patents

Abstract

The utility model relates to a teaching article and particularly to a chalk sleeve. The chalk sleeve comprises a sleeve body, a sliding block and a pushing button, wherein the sleeve body is hollow, the sliding block is located in the sleeve body, a guide groove is arranged on the sleeve body along an axial direction of the sleeve body, saw-shaped grooves are arranged on two sides of the guide groove, the pushing button and the sliding block are in rotating connection through a rotating shaft, the pushing button is located outside the sleeve body, a spring is arranged between the front end of the pushing button and the sliding block, the rear end of the pushing button extends downwards to form a positioning portion, and two sides of the positioning portion are in a saw shape and is fit with the saw-shaped grooves. The problems that chalk dust stains hands, the chalk is easy to break off and the chalk is wasted during usage are solved, and certain advantages are achieved.

Description

A kind of chalk sleeve

Technical field

The utility model relates to a kind of realia, especially a kind of chalk sleeve.

Background technology

School instruction all be unable to do without chalk at present; Teacher is when using chalk; Because of hand and chalk directly contact one is that chalk dust can be bonded on hand, uses the trouble and unhygienic of all will washing one's hands at every turn, the 2nd, and chalk fractures easily; The 3rd, in the chalk residue not for a long time, so caused waste because of being difficult for gripping normally being dropped.

The utility model content

The utility model is intended to address the above problem, and a kind of chalk sleeve is provided, and it has overcome in using the chalk process chalk dust and has been infected with the drawback of hand, chalk frangible and chalk waste, and its technical scheme is following:

A kind of chalk sleeve comprises body, slide block and push button, said body hollow; Said slide block is arranged in body, has a guide groove on its axial direction of said body upper edge, and said guide groove two sides have serriform groove; Said push button and slide block are rotationally connected through turning cylinder, and it is external that push button is positioned at cover, is provided with spring between the front end of said push button and the slide block; The rear end of said push button is extended with the location division downwards, and the both sides indention of said location division matches with serriform groove.

The utlity model has following advantage: deposit, easy to use, avoided the user directly to contact, prevented that effectively chalk is infected with hand with chalk, simultaneously chalk not frangible, can normally not use for a long time when the chalk residue yet and the problem that difficulty grips can occur.

Description of drawings

Fig. 1: the utility model plan structure sketch map;

Fig. 2: A-A is to cutaway view among Fig. 1;

Fig. 3: the upward view of the said push button of the utility model;

Symbol description:

1. chalk, 2. body, 3. slide block, 4. push button, 5. turning cylinder, 6. location division, 7. spring, 8. guide groove, 9. serriform groove.

The specific embodiment

Below in conjunction with accompanying drawing and instance the utility model is described further:

To shown in Figure 3, a kind of chalk sleeve of present embodiment comprises body 2, slide block 3 and push button 4 like Fig. 1; Said body 2 hollows, said slide block 3 is arranged in body 2, has a guide groove 8 on its axial direction of said body 2 upper edges; Said guide groove 8 two sides have serriform groove 9; Said push button 4 is rotationally connected through turning cylinder 5 with slide block 3, and push button 4 is positioned at outside the body 2, is provided with spring 7 between the front end of said push button 4 and the slide block 3; The rear end of said push button 4 is extended with location division 6 downwards, and the both sides indention of said location division 6 matches with serriform groove 9.

During use, chalk 1 is inserted in the body 2, until contacting with slide block 3; Chalk 1 part is exposed body 2, along with using chalk 1 to shorten, promotes push button 4 chalks 1 and just constantly stretches out; Owing to match with serriform groove 9 in location division 6,, use to be exhausted until chalk 1 so slide block 3 can not drawn back; Press push button 4 front ends, because the 4 rear end perks of lever principle push button, so location division 6 breaks away from serriform groove 9; So just, can unclamp the perk under the effect of spring 7 of hand push button 4 front ends with behind push button 4 pulled backwards to guide groove 8 tail ends, location division 6 descends chimeric once more with serriform groove 9.

With way of example the utility model is illustrated above, but the utility model is not limited to above-mentioned specific embodiment, all any changes done based on the utility model or modification all belong to the utility model and require the scope protected.

Claims (1)

1. a chalk sleeve is characterized in that: comprise body (2), slide block (3) and push button (4), said body (2) hollow; Said slide block (3) is arranged in body (2); Have a guide groove (8) on its axial direction of said body (2) upper edge, said guide groove (8) two sides have serriform groove (9), and said push button (4) and slide block (3) are rotationally connected through turning cylinder (5); Push button (4) is positioned at outside the body (2); Be provided with spring (7) between the front end of said push button (4) and the slide block (3), the rear end of said push button (4) is extended with location division (6) downwards, and the both sides indention of said location division (6) matches with serriform groove (9).

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