CN2202649Y

CN2202649Y - Multi-purpose protractor

Info

Publication number: CN2202649Y
Application number: CN 93239466
Authority: CN
Inventors: 黄廷
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-10-30
Filing date: 1993-10-30
Publication date: 1995-07-05
Anticipated expiration: 2003-10-30

Abstract

The utility model belongs to a culture article drawing tool, which is composed of a straight rule and an angle protractor that are connected. The utility model has multi-function of direct angle drawing, arc drawing, angle measurement, arc measurement, equal division of a circle, etc. With simple structure, the utility model is suitable for the drawing works of students, teachers, and scientific and technical persons.

Description

Multi-purpose protractor

The utility model belongs to the cultural goods drawing instrument.

Existing protractor need carry out when drawing the angle in two steps, measures the size at drawn angle earlier, draws with ruler again, and the circular arc of can not directly draw different radii, the different number of degrees can not directly be justified etc. and to grade.

The utility model is that the end with ruler is connected on the central point of Angle protractor, and ruler can be that (see figure 1) is rotated in the center of circle arbitrarily with this central point, when drawing the angle, ruler is forwarded on the angle at drawn angle on the Angle protractor, and the angle of can drawing along the limit of ruler is come.

Have aperture on the different scales on the movable ruler, the scale on the ruler is exactly the radius of circular arc, is the center with the center of Angle protractor, and pencil is inserted can the draw arc of different radii of aperture.

On this multiple use angle protractor lower end of Angle protractor anyhow part can exceed circular arc portion and use as ruler.

Compare with existing protractor, the utlity model has direct picture angle, draw arc, angulation, amount arc, the multiple function of grading such as justify.

Description of drawings and embodiment:

Fig. 1 is the front elevation of a multiple use angle protractor.

The part of multiple use angle protractor comprises: ruler 1, Angle protractor 2, an end of ruler 1 is connected with the central point 3 of Angle protractor 2, and can rotate around central point 3, has aperture 4 on the different scales of ruler 1.

Fig. 2 is the front elevation of another kind of multiple use angle protractor.

The straight part 5 in Angle protractor 2 lower ends can exceed circular arc portion and use as ruler.

Embodiment 1 multiple use angle protractor is connected to form by ruler 1 and Angle protractor 2, sees Fig. 1.

Embodiment 2 multiple use angle protractors by ruler 1 and lower end anyhow part 5 Angle protractor that exceeds circular arc portion and become ruler connect to form, see Fig. 2.

Claims

1, a kind of multiple use angle protractor of forming by ruler 1 and Angle protractor 2, it is characterized in that: the central point 3 of an end of ruler 1 and the straight flange of Angle protractor 2 is bound up, have aperture 4 on the different scales of ruler 1, protractor lower end part 5 anyhow can exceed circular arc portion and uses as ruler.