Novel blackboard eraser

Abstract

The invention provides a novel blackboard eraser, and belongs to the field of teaching tools. By adoption of the novel blackboard eraser, the problem that an existing blackboard eraser is inconvenient to use is solved. The novel blackboard eraser comprises a square base. A mounting groove is formed in the bottom of the base, and a back plate is arranged in the mounting groove. Bristles are obliquely arranged on the back side of the back plate. An adjustment hole is formed between the groove wall of the mounting groove and the lateral portion of the base, and an adjustment block is embedded in the adjustment hole. The side face of the back plate is an oblique face. The adjustment block is provided with an oblique adjustment side face which can be attached to the side face of the back plate. Springs are arranged between the back plate and the bottom of the mounting groove, and the springs pull the back plate to enable the bristles to be located in the mounting groove completely; and the adjustment block can be squeezed towards the side face of the back plate, so that the adjustment side face pushes the side face of the back plate, and the bristles are made to stretch out of the mounting groove. The novel blackboard eraser is convenient to use, and the situation that the bristles are exposed and consequentially working is affected is avoided when the novel blackboard eraser is stored.

Description

[0001] This application was filed on June 26, 2016, the application number is 201610530275.5, and the title of the invention is a divisional application of a patent for an improved chalk eraser. technical field [0002] The invention belongs to the technical field of teaching tools and relates to a novel chalk eraser. Background technique [0003] The chalk eraser generally includes a base and bristles fixed on the bottom of the base. After the teacher uses the chalk eraser, in order to avoid the chalk dust on the bristles from polluting the desk, the bristles are generally placed upwards, but when the chalk eraser is picked up again, it is easy to adhere to the chalk dust on the hand , It is also easy to stick chalk dust to the book, so it is necessary to improve. Contents of the invention [0004] The purpose of the present invention is to provide a kind of novel chalk eraser that can prevent chalk dust from affecting work for the above-mentioned problem that exists in t...

AI Technical Summary

Problems solved by technology

[0003] The chalk eraser generally includes a base and bristles fixed on the bottom of the base. After the teacher uses the chalk eraser, in order to avoid the chalk dust on the bristles from polluting the desk, the bristles are generally placed upwards, but when the chalk eraser is picked up again, it is easy to adhere to the chalk dust on the hand , it is also easy to stick chalk dust to the book, so it is necessary to improve

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