阅读说明：本技术 一种新型黑板擦 (Novel blackboard eraser ) 是由 田卓雅 于 2018-08-22 设计创作，主要内容包括：一种新型黑板擦,为了解决现用黑板擦使用起来费时费力的缺陷,提供一种可存储少量粉笔并且可自由伸长和旋转的粉笔擦。本发明的目的是提供一种使用方便的黑板檫,是由可伸缩的金属杆、旋转接头、可滑动打开金属外壳和毛刷等组成的。其特征在于：可滑动打开的金属外壳內可以放入少量粉笔,同时在使用此黑板擦时,其金属杆可伸缩与旋转。在目前教学用具发展的情况下,本发明提高了教学效率。(A novel blackboard eraser aims to overcome the defects that an existing blackboard eraser is time-consuming and labor-consuming to use, and provides a chalk eraser capable of storing a small amount of chalk and capable of freely extending and rotating. The invention aims to provide a convenient blackboard eraser which comprises a telescopic metal rod, a rotary joint, a metal shell capable of being opened in a sliding mode, a brush and the like. The method is characterized in that: a small amount of chalk can be placed in the metal shell which can be opened in a sliding mode, and meanwhile when the blackboard eraser is used, the metal rod of the blackboard eraser can stretch and rotate. Under the condition of the development of the current teaching aid, the teaching efficiency is improved.)

1. The utility model provides a novel blackboard eraser, it includes metal pole, rotary joint, metal casing and brush, its characterized in that: the metal rod is fixedly connected with the metal shell through a rotary joint, and a brush is arranged below the metal shell.

2. The novel blackboard eraser according to claim 1, characterized in that: the metal rod can be extended and retracted.

3. The novel blackboard eraser according to claim 1, characterized in that: the metal housing is slidable open.

Technical Field

The invention relates to a teaching tool, in particular to a chalk eraser capable of storing a small amount of chalk and freely extending and rotating.

Background

At present, teachers in middle and primary schools need to write on blackboard, the blackboard eraser is single in function, and time and labor are wasted when the blackboard eraser is used.

Disclosure of Invention

The invention aims to solve the defect that the existing blackboard eraser wastes time and labor when used.

The purpose of the invention is realized as follows: the device consists of a telescopic metal rod, a rotary joint, a metal shell capable of being opened in a sliding mode, a hairbrush and the like. The method is characterized in that: a small amount of chalk can be placed in the metal shell which can be opened in a sliding mode, and meanwhile when the blackboard eraser is used, the metal rod of the blackboard eraser can stretch and rotate.

By adopting the structure, the teaching efficiency is improved, and the teaching device has the advantages of being scientific, practical and the like.

Drawings

The invention is further described below with reference to the accompanying drawings:

FIG. 1 is a schematic structural diagram of the present invention.

In the figure: 1 metal rod, 2 rotary joints, 3 hairbrushes and 4 metal shells.

Detailed Description

As shown in fig. 1, a novel blackboard eraser comprises a metal rod, a rotary joint, a metal shell and a brush, and is characterized in that: the metal rod is fixedly connected with the metal shell through a rotary joint, and a brush is arranged below the metal shell. The metal rod can be extended and retracted, and the length of the rod can be adjusted. The metal shell can be opened in a sliding mode, and the hairbrush is convenient to replace.