Protractor

Abstract

The invention discloses a protractor which comprises a protractor body (1), wherein the middle of the protractor body (1) is hollowed out. The protractor further comprises a dwang (2), a sliding rail (4), a sliding block (5), a connecting sheet (6) and a fixed platform (7), wherein the circle center of the protractor body (1) enables one end of the dwang (2) to be fixed through a fixing part (3); scales are marked on the two sides of the dwang (2), a hollowed-out portion is arranged in the middle of the dwang (2), and the sliding rail (4) is fixed to the inner side of the hollowed-out portion; the sliding block (5) is located in the middle of the sliding rail (4), a through hole is formed in the center of the sliding block (5), and one side of the sliding block (5) is connected with one end of the connecting sheet (6) through a hinge; the other end of the connecting sheet (6) is connected with the fixed platform (7) through a hinge, and a through hole is formed in the center of the fixed platform. The protractor integrates the functions of a compass, a dividing ruler and the protractor, enhances flexibility, saves drawing time, improves use efficiency and is convenient to operate.

Description

technical field [0001] The invention relates to a protractor and belongs to the technical field of measuring tools. Background technique [0002] In the measurement tool, a protractor must be used to measure angles. The protractor can freely draw angles, measure angles, draw vertical lines, parallel lines, measure inclination, verticality, levelness, etc., so it is widely used. The traditional protractor includes a protractor body, the protractor body is a solid structure of a semicircle, and a scale line is engraved on the semicircle. When measuring, directly correspond the straight line of the measured angle to the scale line, and then you can read. Such a protractor has a simple structure and is easy to use. . But it has some problems. The body of such a protractor is often engraved with multiple scale lines, which is easy to cause visual confusion, is not conducive to reading, increases errors, and cannot measure the straight line length corresponding to the angle whi...

AI Technical Summary

Problems solved by technology

The body of such a protractor is often engraved with multiple scale lines, which is easy to cause visual confusion, is not conducive to reading, and increases errors, and it is impossible to measure the straight line length corresponding to the angle while measuring the angle, thus increasing the error and reducing the function.

In addition, on this basis, it is impossible to directly use the protractor to draw a circle or arc according to the corresponding radius, and such a protractor usually needs to use a compass to measure the radius before drawing, and the compass and protractor cannot be well integrated. , resulting in reduced flexibility, reduced usage efficiency, increased drawing time, and extended drawing process, so there are limitations

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