CN2186161Y

CN2186161Y - Automatic chalk cover

Info

Publication number: CN2186161Y
Application number: CN 94204598
Authority: CN
Inventors: 杨宝存
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-02-15
Filing date: 1994-02-15
Publication date: 1994-12-28
Anticipated expiration: 2004-02-15

Abstract

The utility model relates to a chalk cover which can automatically stretch. An inner screw sleeve pipe is sheathed on a chalk container which is provided with an elevating trough, and two convex cards on the chalk cover move up and down in the elevating trough so that the chalk can automatically stretch. The utility model has the advantages of simple structure and stretching flexibility and can be matched with an ordinary chalk to use.

Description

Automatic chalk cover

Automatically chalk sleeve is a kind of can being used to write by the clamping chalk, and the device that can stretch automatically.

Prior art of the present utility model is: Chinese patent CN2114566U, and a kind of automatically flexible chalk device, it is formed by the storage penholder is installed in a sleeve by the double end negative thread, the sleeve.Chalk one end must be made sliding tenon so that match with penholder during use.Though whole device is uncomplicated, can not connect supportingly with common flour is straight, thereby use and to be restricted.

The utility model purpose is a kind of chalk sleeve that can stretch automatically of design, can with the supporting use of general chalk, and simple in structure, easy to use.

The utility model project organization is: the overcoat of chalk sleeve is an internal thread sleeve pipe 1 automatically, it is enclosed within on the pen container 3, pen container 3 is connected as a single entity with end handle 4, is shaped on two lifting vertical slots 7 on the pen container 3, and the pen cap 2 relies on that two projectioies 6 are stuck in the lifting groove 7 and can move up and down on it.

In order to eject easily, written screw rod 5 can be housed on end handle 4 tops with surplus chalk head.

Being shaped on several card lines on pen 2 inwalls can make the chalk clamping tighter.Also the pen cap 2 can be made the shape of bore greater than following bore.

The utility model advantage can be stretched automatically with the supporting use of common chalk on being, has avoided polluting finger, has improved teacher's working environment.

Fig. 1 is the utility model structural representation cutaway view.

Fig. 2 is the structural representation of the pen cap.

Embodiment: accompanying drawing and specification the 5th part have described the utility model embodiment in detail.Below in conjunction with accompanying drawing the utility model use principle is done a narration, block chalk one end with the pen cap 2, when rotation end handle 4, the projection 6 on the pen cap 2 relies on the internal thread oscilaltion on the screw shell 1 and realizes that chalk is flexible.

Claims

1, a kind of automatic chalk sleeve, it is characterized in that: be shaped on internal thread on the screw shell (1) and be enclosed within on the pen container (3), pen container (3) is connected as a single entity with end handle (4), be shaped on two lifting grooves (7) on the pen container (3), the pen cap (2) relies on that two projectioies 6 are stuck in the lifting groove (7) and can move up and down on it.

2, automatic chalk sleeve according to claim 1 is characterized in that can being shaped on written screw rod (5) on the end handle (4).

3, automatic chalk sleeve according to claim 1, its feature is shaped on the chucking line on the pen cap (2) inwall.

4, according to claim 1 or 3 described automatic chalk sleeves, the last bore that it is characterized in that the pen cap (2) is less than following bore.