CN2384787Y

CN2384787Y - Angle-drawing instrument

Info

Publication number: CN2384787Y
Application number: CN 99229110
Authority: CN
Inventors: 张光子
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-08-09
Filing date: 1999-08-09
Publication date: 2000-06-28
Anticipated expiration: 2009-08-09

Abstract

The utility model relates to an angle-drawing instrument for students, which is composed of an upper ruler (1), a lower ruler (2) and a circular disk (3) that is provided with angle graduation. The left two ends of the rulers are respectively hinged at the circle center of the circular disk (3), and the upside of the upper ruler (1) and the downside of the lower ruler (2) are respectively provided with a vertical line that is perpendicular to the circle center of the circular disk (3). The utility model smartly uses the principle of geometry, integrates the work of measuring and drawing angles, can directly draw the required angles, and can directly draw the required arbitrary angles.

Description

Angle drawing device

The utility model relates to the angle drawing device tool that a kind of student uses.

Traditional picture angle method is the mapping of construction with ruler and compasses (promptly using ruler and compasses) or protractor secondary, operates cumbersomely, and using appliance is also many, and is easy to generate error.

The purpose of this utility model is exactly the picture angle method of reform traditional, and a kind of angle drawing device of required angle that directly draws of once mapping is provided.

Technical solution of the present utility model is:

Upward formed by ruler (1), following ruler (2), a disk (3) that has angle index by one for this angle drawing device, the left end of two rulers is articulated in the center of circle of disk (3) respectively, is respectively equipped with a vertical line perpendicular to disk (3) center of circle in the top of last ruler (1) and the bottom of following ruler (2).

This angle drawing device make the student learn geometric knowledge and practicality to do the work of picture angle fast and convenient, be the folding utility chi that integrates ruler, protractor, angle drawing device, pattern.Use the utility model, utilize geometrical principle dexterously angulation to be combined together with drawing the angle, directly draw required any angle.

Figure one is the utility model structural representation.

Two rulers connect and can rotate freely between 0～180 ° by the rotating disk that has angle index, and ruler 1 is connected with rotating disk 2, and in fact rotating disk is exactly a protractor, only need two chis are rotated to required angle α, and the angle between two chis is exactly drawn angle β; Intersection point is exactly the summit O at drawn angle between two chis, and two chi limits are exactly two rays at angle, and the angle can be wanted by picture along two ruler limits in the alignment back.Simple to operately understand that make and draw materials easy to be cheaply, the popularizing value height not only to the study geometric knowledge, and also brings great convenience to industrial actual production mapping.

Claims

A kind of angle drawing device of required angle that can directly draw, it is characterized in that upward formed by ruler (1), following ruler (2), a disk (3) that has angle index by one for this angle drawing device, the left end of two rulers is articulated in the center of circle of disk (3) respectively, is provided with a vertical line perpendicular to disk (3) center of circle in addition in the top of last ruler (1) and bottom's branch of following ruler (2).