CN202151963U

CN202151963U - Chalk sleeve

Info

Publication number: CN202151963U
Application number: CN2011202923126U
Authority: CN
Inventors: 张晟廷
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-08-04
Filing date: 2011-08-04
Publication date: 2012-02-29
Anticipated expiration: 2021-08-04

Abstract

The utility model aims to provide a chalk sleeve which sleeves a laser pointer and a chalk sleeve into a whole and realizes the effects that a hand is not sticky when a chalk is held, and the chalk sleeve can be directly used as the pointer. The chalk sleeve comprises a laser propelling rod 1, a pen holding barrel 2, a force transmission ball 3, a pen pushing ejector rod 4, a special spring 5 and a universal chalk 6. External threads 12 of the laser propelling rod 1 are matched with internal threads 21 of the pen holding barrel 2; through positively rotating two rotating lugs 18 applied on the laser propelling rod 1, the laser propelling rod 1 move forwards through the internal threads 21 and drives the pen pushing ejector rod 4 through the force transmission ball 3 to slightly push out the universal chalk 6 as required; pen holding spring sheets 56 always apply proper holding force onto the universal chalk 6; and generally, a user difficultly holds the chalk with a length of below 2 cm, and the universal chalk 6 only can be discarded when the length is less than 1 cm. A laser head 19 is arranged between the two rotating lugs 18; and the chalk sleeve can be directly turned around to be used as the pointer conveniently.

Description

A kind of chalk sleeve

Technical field

The utility model relates to a kind of teaching aid of school, is meant a kind of chalk sleeve that the pupil uses especially.

Background technology

Along with social industrialization; Though multimedia teaching is universal day by day in the school of China part developed area; But the overwhelming majority remains " chalk---teacher's pointer---blackboard " this traditional mode, and writes the pupil comprehension original advantage of writing with the chalk scene.Problem is that the sticking hand of chalk dust is horrible always, simultaneously, puts down chalk and goes to take the order of teacher's pointer also to bother again.

Summary of the invention

The purpose of the utility model provides a kind of chalk sleeve, and laser pointer and chalk sleeve are united two into one, and it is tack-free to realize holding chalk, holds chalk sleeve and directly works as teacher's pointer.

The utility model adopts following technical scheme: a kind of chalk sleeve; Comprise laser pushing ram 1, the bucket 2 that holds a pen, power transmission ball 3, push away a push rod 4, special type spring 5 and general chalk 6; The described bucket 2 that holds a pen has a step groove 25 fixing special type springs 5, and described special type spring 5 is that three of a retainer ring 52 one-sided extensions are at least embraced a spring leaf 56.

The external screw thread 12 of laser pushing ram 1 cooperatively interacts with the internal thread 21 of the bucket 2 that holds a pen; Make it to be rotated in the forward through executing two rotation ears 18 that are beneficial on the laser pushing ram 1; Then laser pushing ram 1 internal thread 21 do advance mobile; Pushing away a push rod 4 through 3 drives of power transmission ball releases general chalk 6 as required slightly; Embrace a spring leaf 56 and give general chalk 6 suitable grip force all the time, just abandon in the time of generally can general chalk 6 being used length less than 1 centimetre, and we have controlled being difficult to below 2 centimetres with holding chalk.

After last general chalk 6 used up; Two rotations of reverse rotation ear 18; Then laser pushing ram 1 internal thread 21 do retreat mobile; T type groove 14 on the laser pushing ram 1 hauls the convex shoulder 41 that pushes away on the push rod 4 and does together and retreat mobilely, then the major part of general chalk 6 is filled in special type spring 5 inwardly and is withstood and push away a push rod 4, embraces a spring leaf 56 and gives general chalk 6 suitable grip force all the time.In the middle of two rotation ears 18 is laser head 19, can reverse end for end directly to use easily as teacher's pointer.

The utility model beneficial effect is: laser pointer and chalk sleeve are united two into one, and it is tack-free to realize holding chalk, holds chalk sleeve and directly works as teacher's pointer.The utility model is novel, easy to use, simple in structure, safe and reliable and be convenient to make and promote.

Description of drawings

Fig. 1 is that the utility model is at the general chalk 6 initial profiles of installing;

Fig. 2 is the profile of the utility model when general chalk 6 uses to intermediate length;

Fig. 3 is that the utility model uses to profile very in short-term at general chalk 6;

To be the utility model at general chalk 6 use Fig. 4 is pushed away a push rod 4 and make the profile when abandoning fully;

Fig. 5 is the A of Fig. 4---the A cross-sectional view

Fig. 6 is the profile of special type spring 5

Fig. 7 is the outline drawing of special type spring 5

The specific embodiment

A kind of chalk sleeve; Comprise laser pushing ram 1, the bucket 2 that holds a pen, power transmission ball 3, push away a push rod 4, special type spring 5 and general chalk 6; The described bucket 2 that holds a pen has a step groove 25 fixing special type springs 5, and described special type spring 5 is armful spring leafs 56 of four of a retainer ring 52 one-sided extensions.

After last general chalk 6 used up; Two rotations of reverse rotation ear 18; Then laser pushing ram 1 internal thread 21 do retreat mobile; T type groove 14 on the laser pushing ram 1 hauls the convex shoulder 41 that pushes away on the push rod 4 and does together and retreat mobilely, then the major part of a back general chalk 6 is filled in special type spring 5 inwardly and is withstood and push away a push rod 4, embraces a spring leaf 56 and gives general chalk 6 suitable grip force all the time.In the middle of two rotation ears 18 is laser head 19, can reverse end for end directly to use easily as teacher's pointer.

Claims

1. chalk sleeve; Top comprises laser pushing ram (1), hold a pen bucket (2), a power transmission ball (3), push away a push rod (4), special type spring (5) and general chalk (6); It is characterized in that: the described bucket (2) that holds a pen has a step groove (25) to fix special type spring (5), and described special type spring (5) is that three of the one-sided extensions at least of a retainer ring (52) are embraced a spring leaf (56).