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Round ruler

A round ruler and round frame technology, applied in the field of round rulers that can draw circles, can solve problems such as inconvenience

Inactive Publication Date: 2013-07-17
张汉兵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When doing math homework, especially those involving circles, you should use a compass to draw a circle, a protractor to measure angles, and a ruler to draw auxiliary lines, which is very inconvenient

Method used

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Embodiment Construction

[0010] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0011] figure 1 A circular ruler according to an embodiment of the present invention is schematically shown.

[0012] Such as figure 1 As shown, the round ruler is mainly composed of a circle frame 1, a cross frame 2 and a pointer 3, and the circle frame 1 and the cross frame 2 form a whole. The circle frame 1 and the cross frame 2 have the same width. The circle frame 1 is marked with a scale of 0-360°. The cross frame 2 is a positive cross, which is symmetrical up and down. Align the 0°, 90°, 180° and 270° of the circle box 1 in a straight line.

[0013] The central point of the cross frame 2 is provided with a connecting column 4, combined with figure 2 , figure 2 It is a schematic diagram of the structure of the connecting column 4, the connecting column 4 is perpendicular to the surface of the cross frame 2, the connecting column 4 is a cylinder, ...

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PUM

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Abstract

The invention discloses a round ruler comprising a round frame, a cross frame and an indicator. The round frame and the cross frame are integrated. A connecting post is arranged at the center of the cross frame. The cross frame and the indicator are in key joint through the connecting post. The vertical projection of a pinpoint of the indicator to the round frame just falls on the inner frame line of the round frame. Scales are marked on the round frame. The round frame can be used for drawing circles. Due to the joint of the cross frame and the indicator, the round ruler can be used as an angel gauge. The cross frame can be used for drawing auxiliary lines. The indicator just points to the inner side of the round frame, so that errors can be reduced during angle measuring.

Description

technical field [0001] The invention relates to a ruler, in particular to a round ruler capable of drawing circles. Background technique [0002] When doing math homework, especially those involving circles, you should use a compass to draw a circle, a protractor to measure angles, and a ruler to draw auxiliary lines, which is very inconvenient. Contents of the invention [0003] The object of the present invention is to provide a circular ruler, which can simultaneously have the functions of drawing circles, measuring angles and providing straight lines. [0004] According to one aspect of the present invention, a round ruler is provided, which is composed of a round frame, a cross frame and a pointer. The round frame and the cross frame form a whole, and a connecting column is arranged in the center of the cross frame, and the cross frame and the pointer are realized through the connecting column. The key is connected, the vertical projection of the needle tip of the po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B43L9/00B43L7/00G01B3/56
Inventor 张汉兵
Owner 张汉兵
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