CN103600599A

CN103600599A - Chalk

Info

Publication number: CN103600599A
Application number: CN201310640980.7A
Authority: CN
Inventors: 刘佳睿
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-12-04
Filing date: 2013-12-04
Publication date: 2014-02-26

Abstract

The invention discloses a chalk. The chalk comprises a chalk body and is characterized in that the chalk further comprises a rubber sleeve, the rubber sleeve is tightly attached to the bottom of the chalk and the side face of the chalk, and the end portion of the rubber sleeve can be folded or unfolded along the side face of the chalk. When the chalk is used, teachers make direct contact with the rubber sleeve and can not be stained with chalk dust, and therefore the chalk is sanitary and healthy. Furthermore, an inverted V-shaped cavity is formed in the bottom of the chalk, and a corresponding inverted V-shaped base which can be inserted into the cavity is fixed to the bottom of the rubber sleeve. A large number of chalks are prevented from being wasted. The reserved rubber sleeve and the reserved base are connected into a whole, and therefore the rubber sleeve and the base can be repeatedly used. In addition, the chalk is in a cylindrical shape and is slippery when held, and therefore a notch for allowing the teachers to conveniently hold the chalk to conduct blackboard writing is formed in the side face of the chalk. The teachers can conveniently conduct blackboard writing.

Description

A kind of chalk

Technical field

The present invention relates to a kind of chalk.

Background technology

Chalk is the instrument widely using in daily life, is generally used for book and writes on the blackboard.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 containing a small amount of calcium oxide.No matter teachers, with chalk writing on the blackboard on blackboard, are common chalk or dust-free chalk, all can cause being stained with on hand chalk dust in the process of writing on the blackboard, unhygienic also unhealthy.

Summary of the invention

For the problems referred to above, the invention provides a kind of chalk, in the process of writing on the blackboard, avoid being stained with on hand chalk dust, not only health but also health.Further, facilitate teacher to hold chalk writing on the blackboard on blackboard.

For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions:

A chalk, comprises chalk, it is characterized in that, also comprises rubber case, and described rubber case is close to bottom and the side of chalk, and the end of described rubber case can be drawn in or launch along the side of chalk.

During use, teachers directly contact rubber case, can not be stained with chalk dust, not only health but also health.And the good hand touch of rubber case, be close to chalk, writing on the blackboard is not impacted, along with shortening of chalk, the end of rubber case can be drawn in toward chalk bottom, simple and convenient.

Further, when chalk uses very short time, cannot hold chalk and carry out writing on the blackboard, so having a large amount of " chalk end " is wasted, therefore in chalk bottom, be provided with a cavity that is down " V " shape, described rubber case bottom is fixed with the base of " V " shape in corresponding an inserted cavity.Avoided chalk to be wasted in a large number, and remaining rubber case and base be connected as a single entity, also can repetitive cycling utilization.

Further, how cylindrical chalk is, when holding, easily skids, and therefore on chalk side, is provided with and conveniently holds the breach that chalk carries out writing on the blackboard.Facilitate teachers' writing on the blackboard.

The invention has the beneficial effects as follows: simple in structure, in the process of writing on the blackboard, avoid being stained with on hand chalk dust, not only health but also health.Further, avoided the waste of chalk.Further, facilitate teacher to hold chalk writing on the blackboard on blackboard.

Accompanying drawing explanation

Fig. 1 is the structural representation of a kind of chalk embodiment mono-of the present invention;

Fig. 2 is the structural representation of a kind of chalk embodiment bis-of the present invention;

Fig. 3 is the structural representation of a kind of chalk embodiment tri-of the present invention;

The mark implication of accompanying drawing is as follows:

1: chalk; 2: rubber case; 3: base; 4: breach.

The specific embodiment

Below in conjunction with accompanying drawing and specific embodiment, technical solution of the present invention is described in further detail, so that those skilled in the art can better understand the present invention also, can be implemented, but illustrated embodiment is not as a limitation of the invention.

As shown in Figure 1, a kind of chalk, comprises chalk 1, also comprises rubber case 2, and rubber case 2 is close to bottom and the side of chalk 1, and the end of rubber case 2 can be drawn in or launch along the side of chalk 1.Wherein rubber case 2 finger-stall used at ordinary times namely, is made by Heveatex or polyurethane material conventionally, rubber case 2 just one preferably, so long as it is all passable to have the soft leather sheath of retractility, such as the protective sleeve of silica gel material.During use, teachers directly contact rubber case 2, can not be stained with chalk 1 ash, not only health but also health.And the good hand touch of rubber case 2, be close to chalk 1, writing on the blackboard is not impacted, along with shortening of chalk 1, the end of rubber case 2 can be drawn in toward chalk 1 bottom, simple and convenient.

When chalk 1 uses very short time, cannot hold chalk 1 and carry out writing on the blackboard, so having a large amount of " chalk end " is wasted, therefore in chalk 1 bottom, be provided with a cavity that is down " V " shape, as shown in Figure 2, and rubber case 2 bottoms be fixed with the base 3 that falls " V " shape in corresponding an inserted cavity.The base 3 of " V " shape that falls is corresponding with the cavity of " V " shape, has avoided the waste of chalk 1, and remaining rubber case 2 and base 3 be connected as a single entity, also can repetitive cycling utilization.Wherein, for the shape of cavity and base 3, " V " shape of falling is preferred embodiment, can be also other shape, such as falling " U " shape, ridge shape.Preferably the height of cavity and base 3 is between sixth to four/mono-of chalk 1 height.

Chalk more than 1 is cylindrical, when holding, easily skids, and therefore on chalk 1 side, is provided with and conveniently holds the breach 4 that chalk 1 carries out writing on the blackboard.Wherein breach 4 can be on even, the symmetrical from top to bottom side that is distributed in chalk 1 and each breach 4 is hemispherical, hemispherical indentation 4 preferably with point correspondingly, as shown in Figure 3, teachers can carry out writing on the blackboard by holding in two breach 4 of symmetry; Breach 4 can also be several uniform ring around the annular groove (not shown) of chalk 1 side, facilitate teacher to hold chalk 1 writing on the blackboard on blackboard.Breach 4 is set and also makes to be not easy to skid between rubber case 2 and chalk 1, fit tightr.

These are only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes description of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.

Claims

1. a chalk, comprises chalk, it is characterized in that, also comprises rubber case, and described rubber case is close to bottom and the side of chalk, and the end of described rubber case can be drawn in or launch along the side of chalk.

2. a kind of chalk according to claim 1, is characterized in that, described chalk bottom is provided with a cavity that is down " V " shape, and described rubber case bottom is fixed with the base of " V " shape in corresponding an inserted cavity.

3. a kind of chalk according to claim 1 and 2, is characterized in that, on described chalk side, is provided with and conveniently holds the breach that chalk carries out writing on the blackboard.

4. a kind of chalk according to claim 2, is characterized in that, the height of described cavity and base is between sixth to four/mono-of chalk height.

5. a kind of chalk according to claim 3, is characterized in that, described breach is from top to bottom on even, the symmetrical side that is distributed in chalk, and each breach is hemispherical.

6. a kind of chalk according to claim 3, is characterized in that, described breach is that several uniform ring are around the annular groove of chalk side.