CN201279998Y

CN201279998Y - Chalk jacket

Info

Publication number: CN201279998Y
Application number: CNU200820222028XU
Authority: CN
Inventors: 张涵
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-10-24
Filing date: 2008-10-24
Publication date: 2009-07-29
Anticipated expiration: 2018-10-24

Abstract

The utility model discloses a chalk sleeve comprising a shell and a movable shaft, wherein, a plurality of fixing teeth are evenly formed on the inner surface of the shell; the movable shaft is movably mounted in an inner cavity of the shell; and movable fins which can be mutually meshed with the fixing teeth and a fixing part used for fixing the chalk are vertically arranged at the end part of the movable shaft, which extends into the shell. The utility model has the advantages of simple structure and convenient use; the length of the part extending from the shell can be adjusted according to the length of the chalk; a user can apply even force for writing and grip the chalk comfortably; and the chalk sleeve can prevent the user from directly contacting the chalk with hands.

Description

Chalk sleeve

Technical field

The utility model relates to a kind of realia, especially relates to a kind of chalk sleeve.

Background technology

When the teacher uses chalk to write on blackboard on class, with the chalk of long section through regular meeting because firmly excessive, cause fractureing of chalk, writing with the chalk of segment to be ground to finger, feels under the weather and does not use power.And the main component of chalk is lime stone and gypsum, directly holds chalk with hand for a long time, make easily hand by chalk pollute, corrosion, be unfavorable for that the teacher's is healthy.Present existing chalk sleeve, often complex structure, damage easily is unfavorable for that the user is flexible, reuses.

The utility model content

Technical problem to be solved in the utility model is at above-mentioned deficiency of the prior art, a kind of chalk sleeve is provided, it is simple in structure, easy to use, can regulate the length that it stretches out housing according to the length of chalk, write firmly evenly, grasping is comfortable, and can avoid hand and the direct of chalk to contact.

For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of chalk sleeve, comprise housing and movable axis, it is characterized in that: described shell inner surface evenly is provided with a plurality of fixed teeth, described movable axis moves and is installed in the housing inner chamber, be positioned at end upper and lower settings that movable axis stretches into housing have can with fixed teeth mutually interlock movable fin and be used for fixing the fixture of chalk.

Be positioned at the fixed teeth both sides in the described housing and be provided with baffle plate.

The two ends up and down of described baffle plate have the groove for described movable fin precession and back-out.

Between movable fin and fixture, be provided with block plate on the described movable axis.

Described fixture is a taenidium.

The end that described movable axis stretches out case top is provided with accent core knob.

Described housing is the elliptical tube that shrink at two ends.

The utility model compared with prior art has the following advantages: 1, simple in structure, use easy and simple to handle, regulate the length that it stretches out housing according to the length of chalk: after the end user is installed on the taenidium on the movable axis to chalk, can transfer the core knob by rotation and extend into length in the housing so that movable fin cooperates with the different fixing tooth with the adjusting movable axis, its installation, regulate all very convenient, so the end user is chalk frangibility not when writing duration section chalk, grasping is comfortable when using short section chalk, do not cause waste.2, effectively isolate hand and chalk: the user holds chalk sleeve when writing, and has effectively isolated hand and chalk, avoids hand to be subjected to the pollution and the corrosion of chalk.

Below by drawings and Examples, the technical solution of the utility model is described in further detail.

Description of drawings

Fig. 1 is the internal structure schematic diagram of the utility model housing.

Fig. 2 is the structural representation of the utility model movable axis.

Fig. 3 is an overall structure schematic diagram of the present utility model.

Fig. 4 is the utility model user mode structural representation.

Description of reference numerals:

1-housing; 2-fixed teeth; 3-baffle plate;

4-groove; 5-chalk; 6-movable axis;

7-movable fin; 8-block plate; 9-taenidium;

10-accent core knob.

The specific embodiment

As Fig. 1, Fig. 2, Fig. 3 and shown in Figure 4, the utility model comprises housing 1 and movable axis 6, movable axis 6 moves in the inner chamber that is installed in housing 1, evenly be provided with a plurality of fixed teeth 2 on housing 1 inner surface, fixed teeth 2 is four row on axial direction on housing 1 inner surface, is four on same circumferential section.

The end that movable axis 6 stretches out housing 1 top is provided with accent core knob 10, and the end user rotates and transfers core knob 10 with the relative position of control movable axis 6 in housing 1.The end upper and lower settings that stretches on the movable axis 6 in the housing 1 has: movable fin 7, block plate 8 and fixture 9, wherein, movable fin 7 can with fixed teeth 2 mutually interlock fix the relative position of movable axis 6 in housing 1 with this, in order to make fixed effect better, be provided with two relative movable fins 7 of position.Fixture 9 is provided with block plate 8 and upwards slides to prevent chalk 5 for being used for fixing the metal system taenidium of chalk 5 on fixture 9.

Be positioned at fixed teeth 2 both sides on housing 1 inner surface and be provided with baffle plate 3, slide the good fixing effect of movable axis 6 when preventing movable fin 7 with fixed teeth 2 interlocks.Because fixed teeth 2 is equally distributed four row on axial direction on housing 1 inner surface, promptly baffle plate 3 is equally distributed eight strip baffle plates on axial direction on housing 1 inner surface, and all there are two strip baffle plates the both sides of every row fixed teeth 2.The two ends up and down of baffle plate 3 have the groove 4 for described movable fin 7 precessions, back-out.

More comfortable when holding housing 1 and write for ease of the end user, housing 1 is the elliptical tube that shrink at two ends.

The above; it only is preferred embodiment of the present utility model; be not that the utility model is imposed any restrictions; every according to the utility model technical spirit to any simple modification, change and equivalent structure transformation that above embodiment did, all still belong in the protection domain of technical solutions of the utility model.

Claims

1. chalk sleeve, comprise housing (1) and movable axis (6), it is characterized in that: evenly be provided with a plurality of fixed teeth (2) on described housing (1) inner surface, described movable axis (6) moves and to be installed in housing (1) inner chamber, be positioned at end upper and lower settings that movable axis (6) stretches into housing (1) have can with fixed teeth (2) mutually interlock movable fin (7) and be used for fixing the fixture (9) of chalk (5).

2. according to the described chalk sleeve of claim 1, it is characterized in that: be positioned at fixed teeth (2) both sides in the described housing (1) and be provided with baffle plate (3).

3. according to the described chalk sleeve of claim 2, it is characterized in that: the two ends up and down of described baffle plate (3) have the groove (4) for described movable fin (7) precession and back-out.

4. according to claim 1,2 or 3 described chalk sleeves, it is characterized in that: be positioned on the described movable axis (6) between movable fin (7) and the fixture (9) and be provided with block plate (8).

5. according to claim 1,2 or 3 described chalk sleeves, it is characterized in that: described fixture (9) is a taenidium.

6. according to claim 1,2 or 3 described chalk sleeves, it is characterized in that: the end that described movable axis (6) stretches out housing (1) top is provided with accent core knob (10).

7. according to claim 1,2 or 3 described chalk sleeves, it is characterized in that: the elliptical tube that described housing (1) shrinks for two ends.