CN201058545Y

CN201058545Y - Practical chalk sleeve

Info

Publication number: CN201058545Y
Application number: CNU2007200801039U
Authority: CN
Inventors: 喻谦鹏; 谌建平
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-06-27
Filing date: 2007-06-27
Publication date: 2008-05-14
Anticipated expiration: 2017-06-27

Abstract

The utility model relates to a teaching aid, specifically speaking are practical chalk cover for writing chalk. The novel screw rod clamping device is characterized by comprising a sleeve, wherein a support body is arranged in the sleeve, the support body is connected with a bottom handle with a threaded rod, a baffle with a screw hole is arranged at one end, close to the bottom handle, of the sleeve, and the baffle is in threaded connection with the threaded rod with external threads. The support body is a cylinder, the diameter of the support body is slightly smaller than the diameter of the sleeve, and the support body is connected with the sleeve through a piston. The length of the sleeve is slightly less than that of the chalk. The threaded rod is fixedly connected with the support body and the bottom handle. The utility model discloses simple structure, convenient to use can use with ordinary chalk is supporting, has avoided polluting teacher's hand, has also improved student's learning environment when having improved teacher's operational environment, low cost, easily popularization moreover.

Description

A kind of practical chalk sleeve

Technical field

The utility model relates to a kind of teaching aid, specifically a kind of practical chalk sleeve that is used to write chalk.

Background technology

The educational aid that chalk is used always as the teacher, it is the necessary article in the teaching, and since the waste that chalk fracture causes and since when writing hand always touch chalk and cause using the back hand skin to become coarse the corrosion that hand produces, more serious in chronicity contact chalk causes the situation of contact dermatitis, just become puzzlement teacher's a serious problem all the time.And chalk sleeve as a kind of for the teacher very important teaching appurtenance, the effect that can reach dustproof, anti-breaking, unrestrained expense, needn't contact, just constantly studied by people all the time, but never applied, existing chalk sleeve otherwise be exactly too simple, effect is bad, be exactly the device too complex, use is inconvenient, production cost is high.Chinese patent CN2114566U once disclosed a kind of automatically flexible chalk device, it is provided with the sleeve of a double end negative thread, the storage penholder is installed in the sleeve, during use, chalk one end must be made sliding firewood so that match with penholder, though this patent to the chalk interplanting further improvement, its complex structure, production cost height and be difficult for matching with common chalk, the scope of application is very limited, and therefore fails extensively to be promoted the use of.

Summary of the invention

The utility model provides a kind of simple in structure for solving the deficiencies in the prior art, and is easy to use, and chalk sleeve applied widely.

The utility model is realized by following content:

A kind of practical chalk sleeve, comprise sleeve pipe, it is characterized in that: be provided with support body in the described sleeve pipe, described support body is connected with the end handle that is threaded bar, described sleeve pipe is provided with the baffle plate of band screw near end handle one side, baffle plate is threaded with being with externally threaded threaded rod, and the casing length after the baffle plate equals threaded rod length.

Described support body is a cylinder, and diameter is slightly less than casing diameter, and support body becomes piston to be connected with sleeve-shaped.

Length before the described sleeve pipe Internal baffle is slightly less than chalk length.

Fixedly connected between described threaded rod and support body and the end handle.

The thickness of casing diameter and chalk adapts.

The two ends of described sleeve pipe are opening.

Be provided with support body in the utility model sleeve pipe, support body is a cylinder, and diameter is slightly less than casing diameter, and support body becomes piston to be connected with sleeve-shaped, conveniently supports and promote flexibly chalk; Support body is connected with the end handle that is threaded bar, and described sleeve pipe is provided with the baffle plate of being with screw near end handle one end, and baffle plate is threaded with being with externally threaded threaded rod, and support body is controlled by the people by end handle, and is easy to use; The thickness of casing diameter and chalk adapts, and effectively the chalk of fixed placement among sleeve pipe keeps its stability in writing process; Casing length after the baffle plate equals threaded rod length, and when support body reached baffle position, threaded rod was unlikely to expose outside by casing protection, makes whole device good looking appearance like this.The utility model is simple in structure, and is easy to use, can reuse, and avoid polluting teacher's hand, also improved student's academic environment when having improved teacher's working environment.

Description of drawings

Fig. 1 is the utility model cutaway view.

The specific embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.As shown in Figure 1, a kind of practical chalk sleeve comprises the suitable sleeve pipe 1 of thickness of diameter and chalk, and sleeve pipe 1 length is slightly less than chalk length.Be provided with cylindrical shape support body 2 in the described sleeve pipe 1, its diameter is slightly less than sleeve pipe 1 diameter, and 1 one-tenth piston of support body 2 and sleeve-shaped is connected.Support body 2 is fixedlyed connected with the end handle 3 that is threaded bar 4, is provided with the baffle plate 5 of being with screw at sleeve pipe 1 near end handle 3 one ends, and baffle plate 5 is threaded with being with externally threaded threaded rod 4.Fixedly connected between described threaded rod 4 and support body 1 and the end handle 3.When in use, only chalk need be put into sleeve pipe 1 and can conveniently use, according to the use abrasion condition of chalk, handle 3 at the bottom of the turn, and under the promotion of threaded rod 4 and support body 1, chalk is constantly released sleeve pipe 1, until using up.After using up piece of chalk, support body 1 is threaded to baffle plate 5 places, reusable again new chalk, so circulation.The utility model is simple in structure, easy to use, has protected effectively that teaching person's is healthy.

Claims

1. practical chalk sleeve, comprise sleeve pipe, it is characterized in that: be provided with support body (2) in the described sleeve pipe (1), described support body (2) is connected with the end handle (3) that is threaded bar (4), described sleeve pipe (1) is provided with the baffle plate (5) of band screw near end handle (3) one ends, baffle plate (5) is threaded with being with externally threaded threaded rod (4), equals the length of threaded rod (4) in baffle plate (5) sleeve pipe (1) length afterwards.

2. a kind of practical chalk sleeve according to claim 1 is characterized in that: described support body (2) is a cylinder, and diameter is slightly less than sleeve pipe (1) diameter, and support body (2) forms piston with sleeve pipe (1) and is connected.

3. a kind of practical chalk sleeve according to claim 1 is characterized in that: described sleeve pipe (1) Internal baffle (5) length before is slightly less than chalk length.

4. a kind of practical chalk sleeve according to claim 1 is characterized in that: fixedly connected between described threaded rod (4) and support body (2) and the end handle (3).

5. according to claim 1 or 3 described a kind of practical chalk sleeves, it is characterized in that: the two ends of described sleeve pipe (1) are opening.