CN202719929U

CN202719929U - Protractor

Info

Publication number: CN202719929U
Application number: CN 201220411791
Authority: CN
Inventors: 杨敏
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-08-11
Filing date: 2012-08-11
Publication date: 2013-02-06
Anticipated expiration: 2022-08-11

Abstract

The utility model discloses a protractor, which comprises a protractor body, an angle scale is provided on the protractor body, a semicircle groove which takes an center of circle of the protractor body as a center of circle is provided on the protractor body, a slide block coupled with the semicircle groove is embedded in the semicircle groove, and a fine wire is connected between the slide block and the center of circle of the protractor body. The protractor has the following beneficial effects that 1) the structure is simple; 2) the semicircle groove is provided on the protractor body, the slide block is embedded in the semicircle groove, the fine wire is connected between the slide block and the center of circle of the protractor body, when the angle is measured, a zero scale on the protractor body and one edge of the angle to be measured enable alignment, then the slide block is rotated, when the fine wire is completely superposed with another edge of the angle to be measured, the angle scale covered by the fine wire is the angle to be measured, thereby the measurement precision is high.

Description

A kind of protractor

Technical field

The utility model relates to a kind of mathematics stationery, particularly a kind of protractor.

Background technology

Protractor is a kind of mathematics stationery commonly used, its major function is to measure angle, existing protractor is in both sides, usually the zero degree scale is alignd with a limit at the angle that will measure, then estimate the other scale that the limit is aimed at the angle that will measure, thereby the angle of reading, so measuring accuracy is relatively poor.

Summary of the invention

Problem to be solved in the utility model is: a kind of simple in structure, protractor that measuring accuracy is high is provided.

In order to solve the problems of the technologies described above, protractor of the present utility model, comprise the protractor body, described protractor body is provided with angle index, described protractor body be provided with one take the center of circle of protractor body the half-arc groove as the center of circle, described half-arc groove is embedded to be connected to a slide block that is complementary with half-arc groove, is to be connected to a finer wire between the center of circle of described slide block and protractor body.

The beneficial effect that the utility model is obtained is: (1) is simple in structure; (2) the protractor body is provided with half-arc groove, half-arc groove is embedded to be connected to a slide block, be to be connected to the bar finer wire between the center of circle of slide block and protractor body, thereby when taking measurement of an angle, zero degree scale on the protractor body is alignd with a limit at the angle that will measure, and rotary slider then is when finer wire overlaps fully with an other limit at the angle that will measure, the angle index that finer wire covers is the angle at the angle that will measure, thereby measuring accuracy is high.

Fig. 1 is structural representation of the present utility model.

Among the figure: 1, protractor body, 2, half-arc groove, 3, angle index, 4, finer wire, 5, slide block.

Embodiment

As shown in Figure 1, protractor of the present utility model, comprise protractor body 1, described protractor body 1 is provided with angle index 3, described protractor body 1 be provided with one take the center of circle of protractor body 1 half-arc groove 2 as the center of circle, described half-arc groove 2 is embedded to be connected to a slide block 5 that is complementary with half-arc groove 2, is to be connected to a finer wire 4 between the center of circle of described slide block 5 and protractor body 1.

In the time of concrete the measurement, zero degree scale on the protractor body 1 is alignd with a limit at the angle that will measure, then rotary slider 5, when finer wire 4 overlaps fully with an other limit at the angle that will measure, the angle index that finer wire covers is the angle at the angle that will measure, thereby measuring accuracy is high.

The utility model is not limited to above-mentioned embodiment, and anyone should learn the structural change of making under enlightenment of the present utility model, every with the utlity model has identical or close technical scheme, all fall within the protection domain of the present utility model.

Claims

1. protractor, comprise protractor body (1), described protractor body (1) is provided with angle index (3), it is characterized in that: described protractor body (1) be provided with one take the center of circle of protractor body (1) half-arc groove (2) as the center of circle, described half-arc groove (2) is embedded to be connected to a slide block (5) that is complementary with half-arc groove (2), is to be connected to a finer wire (4) between the center of circle of described slide block (5) and protractor body (1).