CN2250513Y

CN2250513Y - Protractor

Info

Publication number: CN2250513Y
Application number: CN 95229680
Authority: CN
Inventors: 梁福顺
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-12-22
Filing date: 1995-12-22
Publication date: 1997-03-26
Anticipated expiration: 2005-12-22

Abstract

The purpose of the utility model is to provide a protractor which is composed of inner scales, outer scales and an inner slide board. The utility model is a comprehensive drawing tool which can be used for drawing various figures of straight lines, measuring angles, directly drawing the lengths of both sides of an angle and an included angle, etc. The utility model has simple structure and wide use range and is suitable for teachers to teach, students to measure and all workers.

Description

A kind of protractor

The utility model provides a kind of protractor, belongs to the stationery class.

At present, employed most of angle gage structures are simple, and function singleness can not directly be painted the angle, uses very inconvenient.

The purpose of this utility model provides a kind of protractor, form by inside and outside scaleplate and inner slider, it has drawing beeline, measuring angle, directly paints the comprehensive drawing instrument of two multiple figures such as edge lengths of angle and angle, and it is simple in structure, use widely, be suitable for teaching, the student measures and all drawing workers use.

The purpose of this utility model can realize by following steps, a kind of protractor, being marked with angle index at semi-circular plate forms, the EXT scale plate 1 that protractor is made of the semicircle annulus with together circle center, inner slider 3 and semicircle interior scaleplate 2 are formed, EXT scale plate 1 is connected as a single entity by common radius 5 with inner slider 3, EXT scale plate 1 and interior scaleplate 2 concavo-convex being slidingly matched, interior scaleplate 2 has the groove 4 that is slidingly matched with inner slider 3, and stator 6 and 7 fixed mounts are in groove 4 both sides.

Structure of the present utility model also can be, and establishes a screw hole 8 on stator 6.

Structure of the present utility model also can be, and unit length is carved with bellmouth 9 at interval on the semicircle diameter.

Narrate below in conjunction with drawings and Examples.

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

Fig. 2 is A-A cut-away view of Fig. 1.

Be embodiment of the present utility model in conjunction with the accompanying drawings, the interior scaleplate 2 that the EXT scale plate 1 that this kind protractor is made of the semi-round ring shape with together circle center, inner slider 3 and semicircle constitute is formed, EXT scale plate 1 fuses by common radius 5 with inner slider 3, EXT scale plate 1 and interior scaleplate 2 concavo-convex being slidingly matched, interior scaleplate 2 has the groove 4 that is slidingly matched with inner slider 3, scaleplate 1 slidably reciprocates along inner slider 3 in making, stator 6 and 7 fixed mounts are in groove 4 both sides, in case inner slider 3 skids off from the groove 4 of interior scaleplate 1.

On stator 6, be provided with screw hole 8, with the position of scaleplate 2 in fixing.

Unit length is carved with bellmouth 9 at interval on the semicircle diameter, does the center of circle with it and can conveniently paint circle.

During use, can be according to different needs, scaleplate 1 in rotating, this protractor can present different scales, can draw various required figures after skilled the use, as paint triangle, square, prismatic etc.

The utility model is simple in structure, and is easy to use, is suitable for teaching, student's measurement and all drawing workers and uses, and practicality is very strong.

Claims

1, a kind of protractor, being marked with angle index at semi-circular plate forms, the interior scaleplate (2) that it is characterized in that EXT scale plate (1), inner slider (3) and semicircle formation that protractor is made of the semicircle annulus with together circle center is formed, EXT scale (1) fuses by common radius (5) with inner slider (2), EXT scale plate (1) and concavo-convex being slidingly matched of interior scaleplate (3), interior scaleplate (2) has the groove (4) that is slidingly matched with inner slider (3), and stator (6) and (7) fixed mount are in groove (4) both sides.

2,, it is characterized in that on stator (6), establishing a screw hole (8) by the described a kind of protractor of claim 1.

3,, it is characterized in that the interval unit length is carved with bellmouth (9) on the semicircle diameter by claim 1 or 2 described a kind of protractors.