CN2152670Y - Automatic chalk - Google Patents

Abstract

The utility model relates to an automatic chalk with a chalk as a core, which is composed of an inner sleeve, an outer sleeve and a spring, wherein, the outer surface of the inner sleeve is divided into three parts: an upper part, a middle part and a lower part. The outside diameter of the upper part is larger than that of the middle part, and the outside diameter of the lower end of the lower part is larger than that of the middle part. A lower part pipe is provided with axial slotted holes, and the outside diameter of the middle part of the inner sleeve is slightly smaller than the inside diameter of the outer sleeve. The outer sleeve has an upper part and a lower part, the inside diameter of the upper part is larger than that of the lower part, and the spring is arranged at the upper parts of the inner and the outer sleeves. The automatic chalk is used for protecting users' skin, and users 's hands can avoid directly touching the chalk when the users use the automatic chalk.

Description

Automatic chalk

This is novel be a kind of be the automatic chalk of pen core with the chalk.

Chalk is a writing implement commonly used in a kind of educational propaganda work, is the writing implement of teacher's indispensability in the educational work, and consumption is big.Chalk does not allow the user directly catch and touches chalk owing to material in the dust is harmful to human body skin, and protection user skin is not impaired to be very necessary thing.

Task of the present utility model is that proposition is a kind of improved, simple in structure, easy to use, portable automatic chalk.

The technical solution of the utility model is that automatic chalk is pen core with the chalk, by interior cover, overcoat and spring constitute, and the outer surface of interior cover has top, the middle part, bottom three partly, the top external diameter is greater than the middle part, and last, the middle part transition position has the boss rank, lower outer diameter lower end external diameter has axial slots greater than the middle part on the lower tube.The external diameter at interior cover middle part is slightly less than the internal diameter of overcoat.The axial length of interior cover is longer than overcoat, the outer surface of cover in overcoat is enclosed within, and internal surface of hole has two parts in the overcoat, the top internal diameter is big, and the bottom internal diameter is little, and two part transition positions have the concave station rank, spring is between the concave station rank of interior cover boss rank and overcoat, and chalk places in the inner sleeve as pen core.

The technical solution of the utility model has proposed the new design of automatic chalk, has finished the invention task.

Fig. 1 is an embodiment of the present utility model

Fig. 2 is interior cover embodiment of the present utility model

Fig. 3 is overcoat embodiment of the present utility model

Fig. 4 is that to set up part be teacher's pointer embodiment

Fig. 5 sets up the embodiment that part is a pen

Fig. 6 sets up the embodiment that part is a writing brush

Be described in detail the utility model below in conjunction with accompanying drawing:

Interior cover (3) overcoat (2) all is a light-wall pipe, the outer surface of interior cover (3) has top (11), and middle part (12), bottom (13) three is partly, see Fig. 1, Fig. 2, top external diameter are greater than the middle part, last, the middle part transition position has boss rank (15), lower end, bottom external diameter can be to increase gradually from middle greater than the middle part, has axial slots (14) on the lower tube.The external diameter at interior cover (3) middle part (12) is slightly less than the internal diameter of overcoat (2) bottom (23), top (21) and bottom (23) transition position have step (22), spring (4) is positioned at the concave station rank (22) of overcoat (2) and overlaps between the boss rank (15) of (3), chalk places in interior cover (3) pipe as pen core.Overcoat (2) is enclosed within on the interior cover (3).

At overcoat (2) cap for brush (1) can be arranged, the cap for brush is a round tube, end sealing.Pen clip is arranged on the cap for brush, on interior cover (3) top annex (5) is arranged, setting up part can be combination joint formula teacher's pointer (Fig. 4), it also can be pen (Fig. 5), also can be writing brush (Fig. 6), teacher's pointer be to make up the joint formula, can draw back and condensation, the binding of they and interior cover can be a screw thread, also can be to press formula.

Claims (3)

1, a kind of is the automatic chalk of pen core with the chalk, by interior cover (3), and overcoat (2), spring (4) is formed, and it is characterized in that interior cover (3), and overcoat (2) all is a light-wall pipe, and the outer surface of interior cover (3) has top (11), middle part (12), and bottom (13), three partly.The top external diameter is greater than the middle part, transition position has boss rank (15) at last middle part, lower end, bottom (13) external diameter is greater than the middle part, have axial slots (14) on the lower tube, the external diameter at interior cover (3) middle part (12) is slightly less than middle part (23) internal diameter of overcoat (2), overcoat (2) has top (21) and bottom (23), the top internal diameter is greater than the bottom, top (21) and bottom (23) transition position have concave station rank (22), spring (4) is positioned at the concave station rank (22) of overcoat (2) and overlaps between the boss rank (15) of (3), and overcoat (2) is enclosed within on the interior cover (3).

2, automatic chalk according to claim 1 is characterized in that the bottom (13) of interior cover (3), and internal diameter is constant, and middle increases gradually without leave outward.

3, automatic chalk according to claim 1 is characterized in that there is the cap for brush (1) at the overcoat place.

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