CN201224246Y

CN201224246Y - Chalk sleeve

Info

Publication number: CN201224246Y
Application number: CNU2008200593929U
Authority: CN
Inventors: 姚心怡; 马元璐
Original assignee: Second Foreign Language School Affiliated to Shanghai Normal University
Current assignee: Second Foreign Language School Affiliated to Shanghai Normal University
Priority date: 2008-06-05
Filing date: 2008-06-05
Publication date: 2009-04-22
Anticipated expiration: 2018-06-05

Abstract

The utility model discloses a chalk sleeve, which mainly comprises a sleeve body and a pushing device; the sleeve body is hollow, chalks can be sheathed into the sleeve body; screw threads are arranged on the inner wall of the sleeve body; and the pushing device is inosculated with the screw threads on the inner wall of the sleeve body and can be rotationally sheathed into the screw thread strips of the sleeve body. The chalks can be easily broken when in use; and the chalks can be guaranteed to be used fully under the condition of ensuring the conveniently writing.

Description

A kind of chalk sleeve

Technical field:

The utility model relates to a kind of chalk sleeve, particularly a kind of chalk sleeve that can be attractive in appearance, simple in structure, practical.

Background technology:

Chalk is an indispensable instrument in the teaching process, all is with finger contact chalk when teacher writes in teaching.Because the main component of chalk is quick lime and gypsum, when human body skin Long contact time chalk, the sweat that skin oozed out just produces chemical action with quick lime, generates alkalescent material calcium hydroxide, human body skin there is corrosiveness, is unfavorable for the health of human body.In writing process, if chalk is long with regard to frangibility, and too shortly to be inconvenient to write, therefore a lot of chalks have just still fallen after using 2/3rds, have so just caused waste, also are not easy to carry simultaneously.

The utility model content:

The utility model is at the problems referred to above, thereby and provide a kind of both hands that can make the people directly not contact to have avoided the erosion human body skin with chalk, and can improve the utilization rate of chalk, the chalk sleeve that avoids waste.

To achieve these goals, a kind of chalk sleeve that the utility model is related, it mainly comprises a body and a propulsion plant, described body inner hollow, and can be inserted in chalk, the inwall of body is provided with screw thread simultaneously; Described propulsion plant for the body inwall on screw thread match and can screw in the screw thread bar of body.

The utility model in use, thereby directly not contacting with chalk, the both hands that can make the people do not avoided the erosion human body skin, chalk is frangibility not, and can guarantee to guarantee under the prerequisite that chalk can use up the utility model easy realization simple in structure simultaneously substantially writing easily.

Description of drawings:

Further specify the utility model below in conjunction with the drawings and specific embodiments.

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

The specific embodiment:

For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.

Thereby avoided the erosion human body skin in order to provide a kind of both hands that can make the people directly not contact with chalk, and can improve the utilization rate of chalk, the chalk sleeve that avoids waste, the utility model as shown in Figure 1, the chalk sleeve that is provided mainly comprises body of being made by hard material 2 and the propulsion plant of being made by hard material, the inside of body 2 is hollow, and size just in time can be inserted in piece of chalk 1, and its inwall is provided with internal thread 3; Propulsion plant matching used with it is one to be provided with externally threaded screw thread bar 5, internal thread 3 in its external screw thread and the body coincide, and size just in time can make screw thread bar 5 screw in the body, and an end of screw thread bar is provided with limited block 6, both can be spacing, can conveniently rotate the screw thread bar again.

The utility model in the pen cap of at first chalk being packed into, screws in the screw thread bar in use then from pen cap back, just in time make it withstand chalk, when chalk position externally falls short of,, chalk can be ejected certain length as long as the screw thread bar is screwed in suitable length again.Do not avoided the erosion human body skin thereby the both hands that so promptly can realize making the people directly do not contact with chalk, can guarantee not frangibility of chalk again, and can guarantee to guarantee under the prerequisite that chalk can use up substantially writing easily.

More than show and described basic principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims

1, a kind of chalk sleeve, it mainly comprises a body and a propulsion plant, it is characterized in that, described body inner hollow, and can be inserted in chalk, the inwall of body is provided with screw thread simultaneously; Described propulsion plant for the body inwall on screw thread match and can screw in the screw thread bar of body.