CN202862904U

CN202862904U - Protective sleeve for chalk

Info

Publication number: CN202862904U
Application number: CN 201220589065
Authority: CN
Inventors: 马延清; 刘爱爱
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-11-09
Filing date: 2012-11-09
Publication date: 2013-04-10
Anticipated expiration: 2022-11-09

Abstract

The utility model discloses a protective sleeve for a chalk. The protective sleeve for the chalk comprises a sleeve tube used for sleeving and containing the chalk, wherein an elastic block used for elastically claming the chalk is arranged at one end of the sleeve tube, and a rotary pusher capable of pushing the chalk to move axially is connected with the other end of the sleeve tube in a threaded mode. The rotary pusher comprises a double-screw bolt which is matched with the inner wall of the sleeve tube in a threaded mode, a spring used for sleeving and containing the chalk is fixedly arranged at the inner end of the double-screw bolt, an elastic ring used for sleeving around the chalk is fixedly arranged at the tail end of the spring, a twisting plate is fixedly arranged at the outer end of the double-screw bolt, a brush capable of erasing chalk characters is fixedly arranged on the twisting plate, anti-slipping veins are evenly distributed on the outer surface of the sleeve tube. The anti-slipping veins can strengthen friction force when users hold the protective sleeve for the chalk and effectively avoid the phenomenon of slipping, and thus the protective sleeve for the chalk is more reliable in usage. The protective sleeve for the chalk is reasonable in structure, can not only prevent the chalk breaking off, but also prevent dust from sticking on the hands, is convenient to use, and is suitable for a variety of teaching situations.

Description

Chalk sleeve

Technical field

The utility model relates to a kind of chalk sleeve.

Background technology

Chalk is the writing implement that widely uses in the daily life, generally be common in the teacher on the classroom toward the blackboard use of writing.The chalk in ancient times is made with natural chalk usually, but multiplex other material replaces now.The composition of chalk is a kind of white depositions of calcium sulfate, is not easy to be decomposed, and particle is larger than dust.Now, the chalk of domestic use mainly contains two kinds of common chalk and dust-free chalks, and its main component is calcium carbonate (lime stone) and calcium sulfate (gypsum), or contains a small amount of calcium oxide.At present, about two cun long of chalk commonly used, pluckings, a thin truncated cone-shaped, very well-balanced, very hard very crisp.Chalk is simple in structure, and is with low cost, easy to use, is still at present the main writing implement in China's education sector.Although chalk has above advantage, owing to himself structure and constituent reason, radially holding capacity is less to have determined chalk.The teacher is to pinch the chalk middle part application of force with thumb and forefinger when using chalk to write, and therefore very easily fractures, and so not only affects teaching quality, and has caused waste.Owing to there is not special auxiliary device, chalk generally all is directly to pinch with hand in use.Like this, the dust on the chalk will be stained with to hand, has not only affected hand cleaning, and when patting hand, dust can float in the air, and then affects the healthy of teachers and students.

Summary of the invention

The technical problems to be solved in the utility model is to provide a kind of rational in infrastructure for above-mentioned deficiency, can prevent that chalk from fractureing, and can avoid again dust to be stained with to hand, and chalk sleeve easy to use.

For solving the problems of the technologies described above, the design feature of this chalk sleeve is: comprise the sleeve pipe that can be set with chalk, sleeve pipe one end is installed with the elastomer block of resilient clamp chalk, and the sleeve pipe other end is bolted with and can promotes the axially movable precession device of chalk.

This chalk sleeve is to realize preventing that by suit precession structure chalk from fractureing, and can avoid again dust to be stained with to hand, and easy to use.

Suit precession structure mainly comprises the sleeve pipe that is sleeved on the chalk outside, and sleeve pipe one end is the port that chalk enters, and for convenient narration, this port is called import.The sleeve pipe other end is the port that chalk outwards screws out, and for convenient narration, this port is called outlet.Because casing pipe sleeve is contained in the chalk outside, therefore when using this chalk sleeve, directly pinch sleeve pipe and get final product, use very simply, and avoided hand to contact with the direct of chalk, ensured the cleaning of hand.Be bolted with precession device in the outlet of sleeve pipe, the Main Function of precession device is to promote chalk to move axially.Consume along with the continuous use of chalk like this, just can operate at any time precession device chalk is outwards promoted, continue to write guaranteeing, operate very simple.Therefore be provided with elastomer block in the outlet of sleeve pipe, elastomer block can be carried out resilient clamp to chalk, played the effect of buffer ferrule to the chalk application of force, has greatly improved the effect that chalk bears external force, efficiently solves the problem easy to break of chalk.

As a kind of implementation, described precession device comprises the double-screw bolt with the internal surface of sleeve pipe threaded, and double-screw bolt the inner is installed with the spring of suit chalk, and spring end is installed with the elastic ring of ring set chalk, and the double-screw bolt outer end is installed with turns round dish.

In this precession device, double-screw bolt is the critical piece with the sleeve pipe threaded, also is to promote the critical piece that chalk moves.The double-screw bolt outer end sets firmly turns round dish, and its Main Function is to make things convenient for the user to the double-screw bolt application of force, and then chalk is released in sleeve pipe.The inner elastic ring that arranges of double-screw bolt, its Main Function is that the chalk inner segment is carried out resiliency supported.Like this, chalk all can be subject to resiliency supported at its front and rear, can play the effect of double buffering external force, has greatly reduced the probability that chalk is fractureed, and has effectively avoided wasting phenomenon.Elastic ring is installed in double-screw bolt the inner by spring, can guarantees under the prerequisite of resiliency supported chalk inner segment, chalk can be released fully, also just guaranteed the utilization rate of chalk.

As improvement, turn round be installed with on the dish can the erasing chalk word hairbrush.

Hairbrush is set turning round dish, can write letter written with chalk when using this chalk sleeve again can the erasing chalk word, very convenient, has effectively avoided in the traditional teaching way, takes on the other hand the on the other hand drawback of that blackboard eraser of pen.

As further improvement, be evenly equipped with anti-slip veins on the bushing outer surface.

At bushing outer surface anti-slip veins is set, can strengthens the frictional force of user when controlling this chalk sleeve, effectively avoided skidding, use more reliable.

In sum, adopt the chalk sleeve of this structure, rational in infrastructure, can prevent that chalk from fractureing, can avoid again dust to be stained with to hand, and easy to use, be adapted at various teaching occasionses and use.

Description of drawings

By reference to the accompanying drawings the utility model is described in further detail:

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

Fig. 2 is the structural representation after the utility model dismounting;

Fig. 3 is the structural representation behind the utility model suit chalk.

Among the figure: 1 is chalk, and 2 is sleeve pipe, and 3 is elastomer block, and 4 is precession device, and 5 is double-screw bolt, and 6 is spring, and 7 is elastic ring, and 8 for turning round dish, and 9 is hairbrush, and 10 is anti-slip veins.

The specific embodiment

As shown in the figure, this chalk sleeve comprises sleeve pipe 2, and sleeve pipe 2 is the circular tube shaped of both ends open, and sleeve pipe 2 internal diameters are slightly larger than chalk 1 maximum gauge.Sleeve pipe 2 one ends are the port that chalk 1 enters, and for convenient narration, this port are called import.Sleeve pipe 2 other ends are the port that chalk 1 outwards screws out, and for convenient narration, this port are called outlet.Because sleeve pipe 2 is sleeved on chalk 1 outside, therefore when using this chalk sleeve, directly pinch sleeve pipe 2 and get final product, use very simply, and avoided hand to contact with the direct of chalk 1, ensured the cleaning of hand.Be bolted with precession device 4 in the outlet of sleeve pipe 2, the Main Function of precession device 4 is to promote chalk 1 to move axially.Consume along with the continuous use of chalk 1 like this, just can operate at any time precession device 4 chalk 1 is outwards promoted, continue to write guaranteeing, operate very simple.Therefore be provided with elastomer block 3 in the outlet of sleeve pipe 2, elastomer block 3 can be carried out resilient clamp to chalk 1, played the effect of 2 pairs of chalk 1 application of forces of buffer ferrule, has greatly improved the effect that chalk 1 bears external force, efficiently solves the problem easy to break of chalk 1.

Be evenly equipped with anti-slip veins 10 on sleeve pipe 2 outer surfaces, can strengthen like this frictional force of user when controlling this chalk sleeve, effectively avoided skidding, use more reliable.

In the present embodiment, precession device 4 comprises the double-screw bolt 5 with sleeve pipe 2 inwall threaded, and double-screw bolt 5 outer ends are installed with turns round dish 8.Double-screw bolt 5 is the critical pieces with sleeve pipe 2 threaded, also is to promote the critical piece that chalk 1 moves.Double-screw bolt 5 outer ends set firmly turns round dish 8, and its Main Function is to make things convenient for the user to double-screw bolt 5 application of forces, so with chalk 1 from sleeve pipe 2 interior releases.Turn round dish be installed with on 8 can erasing chalk 1 word hairbrush 9, can write like this chalk 1 word when using this chalk sleeve again can erasing chalk 1 word, very convenient, has effectively avoided in the traditional teaching way, takes on the other hand the on the other hand drawback of that blackboard eraser of pen.

Double-screw bolt 5 the inners are installed with the spring 6 of suit chalk 1, and spring 6 ends are installed with the elastic ring 7 of ring set chalk 1.The Main Function of elastic ring 7 is that chalk 1 inner segment is carried out resiliency supported.Like this, chalk 1 all can be subject to resiliency supported at its front and rear, can play the effect of double buffering external force, has greatly reduced the probability that chalk 1 is fractureed, and has effectively avoided wasting phenomenon.Elastic ring 7 is installed in double-screw bolt 5 the inners by spring 6, can guarantees under the prerequisite of resiliency supported chalk 1 inner segment, chalk 1 can be released fully, also just guaranteed the utilization rate of chalk 1.

Claims

1. chalk sleeve, it is characterized in that: comprise the sleeve pipe (2) that can be set with chalk (1), sleeve pipe (2) one ends are installed with the elastomer block (3) of resilient clamp chalk (1), and sleeve pipe (2) other end is bolted with and can promotes the axially movable precession device of chalk (1) (4).

2. chalk sleeve as claimed in claim 1, it is characterized in that: described precession device (4) comprises the double-screw bolt (5) with sleeve pipe (2) inwall threaded, double-screw bolt (5) the inner is installed with the spring (6) of suit chalk (1), spring (6) end is installed with the elastic ring (7) of ring set chalk (1), and double-screw bolt (5) outer end is installed with turns round dish (8).

3. chalk sleeve as claimed in claim 2 is characterized in that: turn round be installed with on the dish (8) can the erasing chalk word hairbrush (9).

4. chalk sleeve as claimed in claim 3 is characterized in that: be evenly equipped with anti-slip veins (10) on sleeve pipe (2) outer surface.