CN201752980U

CN201752980U - Dustproof chalk sleeve

Info

Publication number: CN201752980U
Application number: CN2010202792036U
Authority: CN
Inventors: 王兴珍; 孙继凤
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-08-03
Filing date: 2010-08-03
Publication date: 2011-03-02
Anticipated expiration: 2020-08-03

Abstract

The utility model relates to a dustproof chalk sleeve, which comprises a sleeve. An elastic rubber cap is arranged at the top of the sleeve, a pusher is arranged in the sleeve, the elastic rubber cap is a big end down conical structure, the diameter of the upper opening of the elastic rubber cap is smaller than the inner diameter of the sleeve, the outer side wall of the pusher is provided with thread, the inner side wall of the sleeve is provided with thread, the pusher is in threaded connection with the sleeve, a chalk is fixed in the sleeve, and fingers can not contact with the chalk, thereby preventing dust corroding fingers. As the chalk is fixed in the sleeve, the chalk can avoid being broken due to uneven pinch stress of fingers, and even a small chalk stub can be used continuously. Simultaneously, an exposed portion of the chalk in the sleeve is pushed by the pusher in an up and down moving form, so that service length of the chalk can be adjusted, the chalk can be gripped with hands more comfortably and used more conveniently.

Description

A kind of dustproof chalk sleeve

Technical field

The utility model relates to a kind of chalk sleeve, and a kind of specifically dustproof chalk sleeve is used for the instrument of clamping chalk, pencil, wax crayon etc., belongs to the educational aid field.

Background technology

Chalk is the instrument that widely uses in the daily life, generally is used for book and writes on the blackboard, and the chalk in ancient times is made with natural chalk usually, but many now material replacements with other.The composition of chalk is a kind of white depositions of calcium sulfate, be not easy to be decomposed, particle is bigger than dust, now, the chalk of domestic use mainly contains two kinds of common chalk and dust-free chalks, its main component of common chalk is calcium carbonate and calcium sulfate, or contain a spot of calcium oxide, when using chalk to write, dust attached on the finger, not only can cause damage to skin for a long time, cleans halfway words and also is drawn in the respiratory tract easily, near the gypsum dust object plane and on the ground blackboard that in air, falls after of short duration the waving, majority is by vibrissa when the nostril, nose, pharynx, throat stops that attached to little air flue of mucous membrane and alveolar, but a spot of dust that still can pass through attached to hand enter health with the respiratory tract that contacts of nose and mouth, still can cause nose, pharynx, throat's discomfort if things go on like this causes certain infringement to health.Therefore dust-free chalk arises at the historic moment, dust-free chalk belongs to the improvement product of common chalk, being intended to eliminate the classroom chalk dust pollutes, it just adds the grease class in common chalk or the polyalcohols material is made binding agent, add the bigger filler of proportion again, as clay, marl, cement etc., the proportion of chalk dust and volume are all increased, be difficult for dispersing, but in actual applications, its reduction effect that chalk dust is polluted is fairly obvious and cost is higher.

Moreover, chalk directly is affectedly bashful with hand in use, also is very easy to fracture, and uses last short and small chalk head and just takes unusual inconvenience with hand, so can only abandon, causes waste.Therefore, we need a kind of chalk clamping device that can solve dust corrosion finger, frangibility and easily waste.

The utility model content

Technical problem to be solved in the utility model provides a kind of dustproof chalk sleeve, can solve dust corrosion finger, prevent the problem that fractures and cut the waste.

For addressing the above problem, the utility model by the following technical solutions:

A kind of dustproof chalk sleeve comprises sleeve pipe, it is characterized in that: the top of described sleeve pipe is provided with the elasticity leather sheath, is provided with push rod in the described sleeve pipe.

Below be further improvement of these options:

Described elasticity leather sheath is up-thin-low-thick conical structure, and the top opening diameter is less than the internal diameter of sleeve pipe.

The lateral wall of described push rod is provided with screw thread, and the madial wall of described sleeve pipe is provided with screw thread, and described push rod is connected with casing threads.

The utility model compared with prior art, have following characteristics: chalk is placed sleeve pipe, make finger can not take place directly to contact with chalk, avoided the phenomenon of dust corrosion finger, simultaneously the chalk that uses is placed sleeve pipe, prevent because of finger and be affectedly bashful the phenomenon that discontinuity breaks, like this, even very little chalk head also can continue to use, utilize push rod to rotate the mode that moves up and down simultaneously and promote the part that chalk exposes in the sleeve pipe, length in the time of can regulating the chalk use is held and felt more comfortable, and is more convenient to use.

The utility model is described in further detail below in conjunction with drawings and Examples:

Description of drawings

Accompanying drawing is the cutaway view of dustproof chalk sleeve among the utility model embodiment.

Among the figure:

The 1-sleeve pipe, 2-cavity, 3-push rod, 4-elasticity leather sheath.

The specific embodiment

Embodiment, as shown in the figure, a kind of dustproof chalk sleeve comprises sleeve pipe 1, be provided with cavity 2 in the sleeve pipe 1, the top of described sleeve pipe 1 is provided with elasticity leather sheath 4, is provided with push rod 3 in the described sleeve pipe 1, and described elasticity leather sheath 4 is up-thin-low-thick conical structure, the top opening diameter is less than the internal diameter of sleeve pipe 1, the lateral wall of described push rod 3 is provided with screw thread, and the madial wall of described sleeve pipe 1 is provided with screw thread, and described push rod 3 is threaded with sleeve pipe 1.

During use, push rod 3 is screwed out, chalk is inserted in the cavity 2 in the sleeve pipe 1, rotate push rod 3 then, making push rod 3 promote chalk moves upward, passing elasticity leather sheath 4 exposes, the material of elasticity leather sheath 4 is the rubber-like rubber, because the up-thin-low-thick structure of elasticity leather sheath 4, and square opening diameter is less than the internal diameter of sleeve pipe 1, make elasticity leather sheath 4 can clamp chalk, prevent that chalk from sliding, utilize push rod 3 to rotate the mode that moves up and down like this and promote the part that chalk exposes in the sleeve pipe 1, the length in the time of can regulating the chalk use, hold and feel more comfortable, more convenient to use.

Claims

1. a dustproof chalk sleeve comprises sleeve pipe (1), it is characterized in that: the top of described sleeve pipe (1) is provided with elasticity leather sheath (4), is provided with push rod (3) in the described sleeve pipe (1).

2. a kind of dustproof chalk sleeve according to claim 1 is characterized in that: described elasticity leather sheath (4) is up-thin-low-thick conical structure, and the top opening diameter is less than the internal diameter of sleeve pipe (1).

3. a kind of dustproof chalk sleeve according to claim 2 is characterized in that: the lateral wall of described push rod (3) is provided with screw thread, and the madial wall of described sleeve pipe (1) is provided with screw thread, and described push rod (3) is threaded with sleeve pipe (1).