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Dust collecting chalk sleeve

A chalk cover and chalk technology, applied in the field of teaching aids, can solve the problems of charging or replacing batteries, and the weight of the chalk cover, etc., and achieve the effect of soft writing

Inactive Publication Date: 2018-04-13
丁云友
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this type of dust-absorbing chalk case is: due to the built-in fan and power supply, the weight of the chalk case will be relatively large, and it needs to be charged or replaced frequently

Method used

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  • Dust collecting chalk sleeve
  • Dust collecting chalk sleeve
  • Dust collecting chalk sleeve

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Embodiment Construction

[0013] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0014] like Figures 1 to 4 As shown, a dust-absorbing chalk cover includes a hollow sleeve 1 and a dust-absorbing tube 2. The lower part of the hollow sleeve 1 contains a chalk window 11 which is socketed with chalk. The inner diameter of the tube 2 is slightly larger than the outer diameter of the hollow sleeve 1, and the inner diameter wall of the dust suction tube 2 and the outer diameter wall of the hollow sleeve 1 form a dust suction channel 3, and a dus...

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Abstract

The invention discloses a dust-absorbing chalk cover, which comprises a hollow casing and a dust-absorbing tube. The dust-absorbing tube is sleeved on the outside of the hollow casing. There is also a dust suction chamber on the outside of the dust suction pipe, and a piston is arranged on the top of the hollow sleeve. The piston is in sealing and sliding contact with the dust suction chamber. The outer wall of the dust suction pipe is sealed with a sealing rubber ring, and a detachable dust filter chamber is arranged outside the lower part of the dust suction chamber. The dust-absorbing chalk case of the present invention does not need power consumption, is very light and handy, and at the same time, the written characters can be softer.

Description

technical field [0001] The invention relates to the field of teaching appliances, in particular to a dust-absorbing chalk cover. Background technique [0002] When teachers write on the blackboard in class, they mostly hold chalk in their hands, and their hands are in close contact with the chalk. After a long time, due to the material of the chalk and other reasons, it will cause damage to the skin of the fingers; for this, some teachers will use The chalk cover puts the chalk in it, and then writes by holding the chalk cover, so that the chalk can be prevented from causing damage to the hand. In addition, in order to further improve the function of the chalk case, some chalk cases that can absorb chalk dust have appeared in the prior art. This type of chalk case is realized by setting a negative pressure fan in the chalk case; The advantage is that the dust generated during writing can be sucked into the chalk case to prevent the dust from being sucked into the lungs. Ye...

Claims

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Application Information

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IPC IPC(8): B43K23/016B43K19/14B43L21/02
CPCB43K23/016B43K19/14B43L21/02
Inventor 丁云友
Owner 丁云友
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