CN201856492U - Chalk sleeve - Google Patents

Abstract

The utility model provides a chalk sleeve, which comprises a casing (3) with an open lower end, a chalk claw (2) reciprocating in the casing (3), and a chalk claw (2) and a sleeve fixed on the casing (3). The elastic element (1) at the top of the tube (3), wherein the side of the sleeve (3) is provided with a chute (31) extending from the top to the bottom, and the chalk claw (2) includes a main body (21), a main body (21 ) a clamping mechanism extending vertically downward, and a chuck (211) extending from the main body (21) and extending from the chute (31) of the sleeve (3) to the outside of the sleeve (3). According to the chalk sleeve of the utility model, the length of the chalk is virtually increased, the utilization rate of the chalk is improved, the teaching cost is reduced, and since the user does not directly touch the chalk, the cleanliness of the user is guaranteed.

Description

A kind of chalk sleeve

[technical field]

The utility model relates to a kind of educational aid, particularly a kind of chalk sleeve.

[background technology]

In teaching, chalk is one of most important aid in all educational aids, though, in a lot of advanced schools, adopted electronics to give lessons, but, for most of school, mode of on blackboard, giving lessons or ubiquity with the chalk writing words, at this moment, the utilization rate of chalk is a very important factor for instruction cost.In most of the cases, when chalk when becoming very little to the end owing to grasp inconveniently, a lot of teachers discard these chalks, so, the utilization rate of chalk is had a greatly reduced quality, and instruction cost increases therefrom.In addition, because the teacher is when using chalk, hand directly contacts with chalk, and therefore, a class gets off, teacher's hand by chalk pollute very serious, necessary cleaning, thereby, had a strong impact on teacher's sanitation and hygiene.

[utility model content]

Technical problem to be solved in the utility model provides a kind of chalk sleeve, can improve the utilization rate of chalk, reduces instruction cost, and for the user, sanitation and hygiene.

For achieving the above object, the utility model provides a kind of chalk sleeve, comprise the open sleeve pipe in lower end, reciprocating chalk claw in sleeve pipe, and the flexible member that is fixed on chalk claw and cannula tip, wherein, the sleeve pipe side offers from the top chute that extends to the bottom, and the chalk claw comprises that adding that main body, autonomous agent extend downward vertically hold mechanism, and autonomous agent continues to extend and extend from the chute of sleeve pipe the dop of jacket exterior.

As preferred embodiment of the present utility model, described internal surface of sleeve pipe is provided with and communicates with chute and form the card nest of angle with chute;

As preferred embodiment of the present utility model, described chute forms 90 degree angles with the card nest;

As preferred embodiment of the present utility model, the chalk claw is provided with the projection that autonomous agent extends vertically upward, and described flexible member is fixed on this projection;

As preferred embodiment of the present utility model, projection is provided with the through hole that runs through self in vertical direction, and this through hole further runs through main body;

As preferred embodiment of the present utility model, described chalk sleeve further comprises thimble, and described thimble is fixed on the sleeve pipe top interior, and extends in the through hole;

As preferred embodiment of the present utility model, described flexible member is a spring.

Compared with prior art, the utility model chalk sleeve has the following advantages at least: when the chalk use is extremely very little,, can increase the length of chalk by the utility model chalk sleeve, thereby, improve the utilization rate of chalk, and reduce instruction cost; In addition, during owing to use, what hand directly contacted is sleeve pipe, rather than chalk itself, has therefore guaranteed user's sanitation and hygiene.

[description of drawings]

Fig. 1 is the structure cutaway view of the utility model chalk sleeve, and wherein, the chalk claw is positioned at the primary importance near cannula tip;

Fig. 2 is the structure cutaway view of the utility model chalk sleeve, and wherein, the chalk claw is positioned at the second place near sleeve bottom;

Fig. 3 is the structure cutaway view in another cross section of the utility model molding powder pen cap tube.

The corresponding relation of number in the figure and each element is as follows:

Flexible member	1	The chalk claw	2	Main body	21
						Dop	211	Claw	23	Projection	25
Sleeve pipe	3	Chute	31	The card nest	33
						Thimble	7	?	?	?	?

[specific embodiment]

See also Figure 1 and Figure 2, the utility model chalk sleeve comprises sleeve pipe 3, place in the sleeve pipe 3 and the chalk claw 2 of the outstanding sleeve pipe of part, be fixed on the flexible member 1 on the chalk claw 2, and is fixed on the sleeve pipe 3 and extends into thimble 7 in the chalk claw 2.

Sleeve pipe 3, cylindrical structure, and the lower end is open, and so, chalk can stretch to sleeve pipe 3 inside from the lower end; Please consult shown in Figure 1 especially, sleeve pipe 3 sides offer long and narrow opening, form chute 31, chalk claw 2 extends sleeve pipe 3 from this chute 31, in addition, sleeve pipe 3 inwalls also offer communicate with this chute 31 and with chute 31 card nest 33 in a certain angle, in the present embodiment, described chute 31 is 90 degree angles with card nest 33.

Chalk claw 2 is the claw-like structure, comprises that main body 21, autonomous agent 21 extended respectively vertically downward and at a distance of the claw 23 of certain distance, and autonomous agent 21 projection 25 of extending vertically upward.Wherein, described main body 21 is along sleeve pipe 3 horizontal expansions, and main body 21 ends are extended with dop 211, in fact, in the present embodiment, dop 211 is structure as a whole with main body 21, wherein, main body 21 is extended outside part from the chute 31 of sleeve pipe 3 and just is called dop 211; Claw 23 and main body 21 vertical settings, in the time of in chalk extends into sleeve pipe 3, a pair of claw 23 adds chalk to be held with fixing chalk; Projection 25 autonomous agents 21 position intermediate are extended vertically upward, and projection 25 central authorities are provided with through hole (not shown), and this through hole runs through the main body 21 of chalk claw 2 in vertical direction.

Flexible member 1 in the present embodiment, is spring, and the one end is fixed on the chalk claw 2, and the other end is fixed on the upper end of sleeve pipe 3.

Thimble 7 has sufficient length, and spring housing is in thimble 7 outsides, and thimble 7 passes in the through hole that spring extends into chalk claw 2.

During use, at first active force is acted on the dop 211 of chalk claw 2, make chalk claw 2 along the chute 31 of sleeve pipe 3 from the upper end to lower slider until the end, at this moment, add with a pair of claw 23 of chalk claw 2 and to hold and fixing chalk, afterwards, make chalk claw 2 suitably moving to travelling backwards, the distance that moves is according to the length decision of chalk, after moving to correct position, dop 211 is pushed in the card nest 33 of sleeve pipe 3 stuck, at this moment, the fixed-site of chalk claw 2 in sleeve pipe 3, so, increased the length of chalk, easy to use; If chalk uses, it need be taken out from sleeve pipe 3, then only need to apply active force for dop 211, its continuation is moved towards the upper end of sleeve pipe 3, until, chalk contacts with thimble 7, at this moment, continue to make chalk claw 2 to move, at this moment towards sleeve pipe 3 upper ends, because the effect of thimble 7, chalk is ejected naturally.

The above only is a kind of embodiment of utility model, it or not whole or unique embodiment, the conversion of any equivalence that those of ordinary skills take technical solutions of the utility model by reading the utility model specification is claim of the present utility model and contains.

Claims (7)

1. a kind of chalk sleeve, it is characterized in that: comprise the sleeve pipe (3) that lower end is open, the chalk jaw (2) that reciprocates in sleeve pipe (3), and be fixed on chalk jaw (2) and The elastic element (1) at the top of the sleeve (3), wherein the side of the sleeve (3) is provided with a chute (31) extending from the top to the bottom, and the chalk claw (2) includes a main body (21), a main body ( 21) A clamping mechanism extending vertically downward, and a chuck (211) extending from the main body (21) and extending from the chute (31) of the sleeve (3) to the outside of the sleeve (3). 2. The chalk sleeve according to claim 1, characterized in that: the inner wall of the sleeve (3) is provided with a socket (33) which communicates with the chute (31) and forms an angle with the chute. 3. The chalk sleeve according to claim 2, characterized in that: the chute (31) and the socket (33) form an angle of 90 degrees. 4. The chalk sleeve according to claim 1, characterized in that: the chalk claw (2) is provided with a protrusion (25) extending vertically upward from the main body (21), and the elastic element (1) is fixed on on the protrusion (25). 5. The chalk sleeve according to claim 4, characterized in that: the protrusion (25) is provided with a through hole penetrating itself in the vertical direction, and the through hole further penetrates the main body (21). 6. The chalk sleeve according to claim 5, characterized in that: the chalk sleeve further comprises a thimble (7), and the thimble (7) is fixed inside the top of the sleeve (3) and extends into the through hole Inside. 7. The chalk sleeve according to any one of claims 1 to 6, wherein the elastic element is a spring. the

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