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Dust-free blackboard eraser

A blackboard eraser and bottom plate technology, applied in the field of teaching supplies, can solve the problems of heavy weight, inconvenient use, complicated structure of the blackboard eraser, etc., and achieve the effect of simple structure

Inactive Publication Date: 2019-08-20
王晨
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this blackboard eraser has complicated structure and heavy weight, it is inconvenient to use

Method used

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  • Dust-free blackboard eraser
  • Dust-free blackboard eraser
  • Dust-free blackboard eraser

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] The present invention as Figure 1-3 As shown, it includes a hollow handle 1 and a wiper 2 arranged on the handle. Several springs 3 are arranged in the handle, and one end of the spring 3 is fixed on the top inside the handle. One end is fixedly connected with the wiper, and a magnet 4 is arranged in the middle of each spring, and the spring is sleeved on the magnet, and the wiper slides on the side wall of the handle through the support plate 5 . When wiping the blackboard, the rubbing body exerts pressure on the spring, so that the spring shrinks, cutting the magnetic induction line, and generating a current in the spring to generate a magnetic field to absorb fine dust. When the blackboard is wiped, the spring resets and does not stretch back and forth. , so as to stop cutting the magnetic flux line movement, and the magnetism of the spring disappears. In this way, the mechanical energy of wiping the blackboard is converted into a magnetic field, so that the sprin...

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PUM

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Abstract

The invention discloses a dust-free blackboard eraser, relates to the field of realia, and particularly relates to improvement of the blackboard eraser in the prior art. The dust-free blackboard eraser is simple in structure, good in wiping effect and lightweight in use. The dust-free blackboard eraser comprises a hollow handle and an eraser body arranged on the handle, wherein a plurality of springs are arranged in the handle, one ends of the springs are fixed to the inner top end of the handle, the other ends of the springs are fixedly connected with the eraser body, a magnet is arranged inthe middle of each spring, the springs sleeve the magnets, and the eraser body slides on the side wall of the handle through a supporting plate; and sliding grooves are symmetrically formed in the side wall of the handle, the supporting plate is L-shaped, the short edges of the supporting plate are clamped in the sliding grooves and can slide in the sliding grooves, and the long edges of the supporting plate are connected with the eraser body. The dust-free blackboard eraser is simple in structure, and the whole blackboard eraser is more lightweight.

Description

technical field [0001] The invention relates to the field of teaching supplies, in particular to the improvement of the blackboard eraser in the prior art. Background technique [0002] The existing blackboard eraser has a lot of dust when wiping the blackboard, which leads to easy inhalation of dust in the process of wiping the blackboard, which affects human health. The State Intellectual Property Office published an invention patent application (CN 105882263 A, a blackboard eraser) on 2016-8-24, which disclosed a blackboard eraser body, a handle and bristles. The blackboard eraser body was hollow and installed with an electrostatic generator device; the blackboard eraser is also equipped with a switch, a powder box and a battery box. When in use, hold the handle of the blackboard eraser, check each part of the blackboard eraser, and press the switch on the handle. After electrification, it will generate static electricity (no harm to the human body), wipe the blackboard...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B43L21/00B43L21/02
CPCB43L21/00B43L21/02
Inventor 王晨
Owner 王晨