CN210881426U

CN210881426U - Chalk sleeve

Info

Publication number: CN210881426U
Application number: CN201921084729.6U
Authority: CN
Inventors: 周奕萌
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-07-12
Filing date: 2019-07-12
Publication date: 2020-06-30
Anticipated expiration: 2029-07-12

Abstract

The utility model relates to a chalk cover, including pressing from both sides core and overcoat, press from both sides core lower half and vertically split, the overcoat is outside pressing from both sides the core, and the mouth inside diameter is unanimous with pressing from both sides the core under the overcoat mouth outside diameter, and the core splits the mouth upper portion inside diameter and is not less than the big head end diameter of chalk, presss from both sides core bottom inside diameter and equals the little head end diameter of chalk, is equipped with compression spring between the annular bead of second and the annular bead of first, and the annular bead of third is near first annular bead below. The utility model can automatically realize the adjustment of the length of the chalk, and the hand does not need to contact the chalk; can be used for shorter chalk heads; is not easy to break off when writing and is convenient for writing and using.

Description

Chalk sleeve

Technical Field

The utility model relates to a stationery technical field, concretely relates to chalk cover.

Background

At present, chalk plays an important role in teaching writing due to the convenience of writing and wiping, however, the component of the chalk is generally calcium carbonate, the skin of fingers is easy to be injured, the fingers are not sanitary when directly contacting the chalk, and the chalk is difficult to use after being shortened, only can be discarded, causes waste and pollutes the environment. Although some existing chalk sleeves can embed chalk, chalk ends are continuously abraded in the using process, the chalk ends need to be continuously adjusted outwards, and the chalk ends often need to be pulled outwards or screwed by hands, so that the chalk ends are exposed out of the chalk sleeves. The adjustment process is extremely inconvenient and requires direct contact with the chalk tip by hand.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve above-mentioned problem, provide a chalk cover, it is convenient that it adjusts the chalk end to adjustment process is not with the hand contact chalk.

In order to solve the above problem, the utility model discloses a technical scheme as follows:

the chalk sleeve is characterized by comprising a sandwich core 1 and an outer sleeve 2, wherein the sandwich core 1 is cylindrical, the lower half part of the sandwich core 1 is longitudinally split, the lower part of the sandwich core 1 is conical, the wall thickness of the conical part at the lower part of the sandwich core 1 is gradually thickened from top to bottom, the outer sleeve 2 is a cylindrical barrel with an opening at the lower end, the outer part of the sandwich core 1 is sleeved with the outer sleeve 2, the inner diameter of the lower opening of the outer sleeve 2 is consistent with the outer diameter of the lower port of the sandwich core 1, the inner diameter of the upper part of the split end of the sandwich core 1 is not smaller than the diameter of a large head end of chalk, the inner diameter of the bottom end of the sandwich core is equal to the diameter of a small head end of the chalk, the upper end of the sandwich core 1 is exposed out of the outer sleeve 2, a first annular convex edge 3 is arranged on the inner wall of the middle part, the third annular convex edge 5 is tightly close to the lower part of the first annular convex edge 3, and the lower end of the core 1 is flush with the lower end of the outer sleeve 2.

Preferably, a top column 7 is arranged above the sandwich core 1, the top column 7 extends into the sandwich core 1, and the upper end of the top column 7 exceeds the sandwich core 1.

Further optimization, the outer wall of the top column 7 is in threaded connection with the top of the sandwich core 1.

Preferably, the lower end of the outer sleeve 2 is matched with a chalk end polisher 8, the chalk end polisher 8 is hemispherical or conical, and polishing textures are arranged on the inner surface of the chalk end polisher 8.

Further preferably, the chalk end sander 8 is connected with the lower end of the outer sleeve 2 through threads.

The utility model discloses a theory of operation does:

referring to the attached figure 2 of the specification, the outer sleeve is held by a hand, a thumb presses the upper end of the sandwich downwards, the compression spring is extruded, the lower end of the sandwich is exposed out of the outer sleeve, the lower half part of the sandwich is longitudinally cracked, cracked strips on the lower part of the sandwich are loosened, chalk slides downwards under the self gravity, and the length of the chalk end is adjusted. The upper end of the sandwich core is loosened by the thumb, the third annular convex rib is clamped by the first annular convex rib under the resilience force of the compression spring, the sandwich core automatically resets, the lower port of the sandwich core is clamped by the outer sleeve, and the chalk is clamped by the sandwich core.

The chalk is a cone with a large end and a small end, when the chalk is inserted into the chalk sleeve, the large end of the chalk props up the crack of the sandwich, and the chalk is inserted into the chalk sleeve. When the chalk big end is clamped into the lower end of the sandwich, the chalk big end props open the sandwich to have big cracks, and the lower end of the outer sleeve clamps the outer part of the sandwich upwards due to the conical shape of the lower part of the sandwich. When the small end of the chalk is clamped into the lower end of the sandwich, the small end of the chalk props open the sandwich to cause small cracks, and the lower end of the outer sleeve clamps the outer part of the sandwich to be lower.

Compared with the prior art, the utility model has the advantages that:

the utility model can automatically realize the adjustment of the length of the chalk, and the hand does not contact the chalk in the process of adjusting the length of the chalk;

the utility model can be applied to shorter chalk ends, and the sandwich can be clamped as long as the chalk length can be put in the sandwich;

the utility model discloses the chalk is whole to be entangled by the chalk cover, writes the difficult rupture of in-process chalk, is convenient for write, and the hand does not contact the chalk.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings while paying inventive attention.

FIG. 1 is a cross-sectional view of a chalk sleeve according to one embodiment;

FIG. 2 is a cross-sectional view showing the working state of the chalk sleeve of the present invention when the length of the chalk end is adjusted;

FIG. 3 is a cross-sectional view of a chalk sleeve according to a second embodiment;

FIG. 4 is a cross-sectional view of a chalk sleeve according to a third embodiment;

description of reference numerals: the chalk comprises a sandwich core-1, an outer sleeve-2, a first annular rib-3, a second annular rib-4, a third annular rib-5, a compression spring-6, a top column-7 and a chalk end sander-8.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention can be more clearly and clearly defined.

The first embodiment is as follows:

referring to the attached figure 1 of the specification, the utility model provides a chalk sleeve, which comprises a sandwich core 1 and an outer sleeve 2, wherein the sandwich core 1 is cylindrical, the lower half part of the sandwich core 1 is longitudinally cracked, the appearance of the lower part of the sandwich core 1 is conical, the wall thickness of the conical part of the lower part of the sandwich core 1 is gradually thickened from top to bottom, the outer sleeve 2 is a cylindrical barrel with an open lower end, the outer sleeve 2 is sleeved outside the sandwich core 1, the inner diameter of the lower end of the outer sleeve 2 is consistent with the outer diameter of the lower end of the sandwich core 1, the inner diameter of the upper part of the cracked end of the sandwich core 1 is not smaller than the diameter of a chalk big end, the inner diameter of the bottom end of the sandwich core is equal to the diameter of the chalk small end, the outer sleeve 2 is exposed at the upper end of the sandwich core 1, a first annular convex edge 3 is arranged on the inner wall of the middle part of the outer sleeve 2, the third annular convex edge 5 is tightly close to the lower part of the first annular convex edge 3, and the lower end of the core 1 is flush with the lower end of the outer sleeve 2.

The specific operation process of the specific embodiment is as follows: the outer sleeve is held by a hand, the thumb presses the upper end of the sandwich downwards, the compression spring is extruded, the lower end of the sandwich is exposed out of the outer sleeve, the lower half part of the sandwich is longitudinally cracked, the cracked strips on the lower part of the sandwich are loosened, the chalk slides downwards under the self gravity, and the length of the chalk end is adjusted. The upper end of the sandwich core is loosened by the thumb, the third annular convex rib is clamped by the first annular convex rib under the resilience force of the compression spring, the sandwich core automatically resets, the lower port of the sandwich core is clamped by the outer sleeve, and the chalk is clamped by the sandwich core.

The second embodiment is as follows:

referring to the attached figure 3 in the specification, when the length of the chalk tip is adjusted, for convenience of operation, on the basis of the first embodiment, a top pillar 7 is arranged above the sandwich core 1, the top pillar 7 extends into the sandwich core 1, and the upper end of the top pillar 7 exceeds the sandwich core 1. The specific operation process of the specific embodiment is as follows: the outer sleeve is held by a hand, the thumb presses the upper end of the sandwich downwards, the compression spring is extruded, the lower end of the sandwich is exposed out of the outer sleeve, the lower half part of the sandwich is longitudinally cracked, the sandwich is loosened, the ejection column extrudes chalk downwards, the chalk slides downwards, the thumb loosens the upper end of the sandwich, the third annular convex edge is clamped by the first annular convex edge under the resilience force of the compression spring, the sandwich automatically resets, the lower port of the sandwich is clamped by the outer sleeve, and the chalk is clamped by the sandwich.

In order to fix the top column and the chalk sleeve together without separation, the outer wall of the top column 7 is in threaded connection with the top of the sandwich 1.

The third concrete embodiment:

referring to the attached figure 4 in the specification, in order to polish the chalk end, a chalk end polisher 8 is arranged at the lower end of the outer sleeve 2, the chalk end polisher 8 is hemispherical or conical, and polishing textures are arranged on the inner surface of the chalk end polisher 8.

Further preferably, the chalk end sander 8 is connected with the lower end of the outer sleeve 2 through threads. The chalk end sander of the specific embodiment can be used for a protective cover of a chalk end, and when the chalk end sander is not used, the chalk end is prevented from being broken due to the fact that chalk falls.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only preferred embodiments of the present invention, and the present invention is not limited by the above preferred embodiments, and various changes and modifications can be made without departing from the spirit and scope of the present invention, and these changes and modifications all fall into the scope of the present invention as claimed.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The chalk sleeve is characterized by comprising a sandwich core (1) and an outer sleeve (2), wherein the sandwich core (1) is cylindrical, the lower half part of the sandwich core (1) is longitudinally split, the appearance of the lower part of the sandwich core (1) is conical, the wall thickness of the conical part of the lower part of the sandwich core (1) is gradually thickened from top to bottom, the outer sleeve (2) is a cylindrical barrel with an opening at the lower end, the outer sleeve (2) is sleeved outside the sandwich core (1), the inner diameter of the lower end opening of the outer sleeve (2) is consistent with the outer diameter of the lower end opening of the sandwich core (1), the inner diameter of the upper part of the split end of the sandwich core (1) is not smaller than the diameter of a chalk big end, the inner diameter of the bottom end of the sandwich core is equal to the diameter of a chalk small end, the outer sleeve (2) is exposed at the upper end of the sandwich core (1), the second annular convex edge (4) is positioned above the first annular convex edge (3), a compression spring (6) is arranged between the second annular convex edge (4) and the first annular convex edge (3), the third annular convex edge (5) is abutted against the lower part of the first annular convex edge (3), and the lower end of the sandwich core (1) is flush with the lower end of the outer sleeve (2).

2. The chalk sleeve according to claim 1, characterized in that a top pillar (7) is arranged above the core (1), the top pillar (7) extends into the core (1), and the upper end of the top pillar (7) exceeds the core (1).

3. The chalk sleeve according to claim 2, characterized in that the outer wall of the top pillar (7) is in threaded connection with the top of the core (1).

4. The chalk sleeve according to claim 1, characterized in that the lower end of the outer sleeve (2) is provided with a chalk end sander (8), the chalk end sander (8) is hemispherical or conical, and the inner surface of the chalk end sander (8) is provided with sanding textures.

5. A chalk holder according to claim 4, characterized in that the chalk end sander (8) is screwed to the lower end of the outer sleeve (2).