CN2085308U

CN2085308U - Set square combined with compasses and protractor

Info

Publication number: CN2085308U
Application number: CN 90222251
Authority: CN
Inventors: 范世龙
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-10-11
Filing date: 1990-10-11
Publication date: 1991-09-25

Abstract

The utility model relates to a combined set-square combined by a set-square, a protractor and a compass plate. A rotating circle-shaped compass plate is inlaid on the inner circumference of the center of the set-square. The center of the compass plate is the circle-center, around whose surrounding equidistant small-holes are arranged in a spiral shape. When the compasses plate rotates for a round, the trails that all small-hole rotates following the compasses plate are concentric circles with different radius. Two right-angle sides of the set-square are provided with straightedge graduations. The inner circumference of the center is provided with angle graduations in a range of 0 to 180 DEG. With simple structure and convenient operation, the combined set-square is most suitable for primary and secondary school students.

Description

Set square combined with compasses and protractor

The utility model belongs to instrument of surveying and mapping.

At present, the set square of selling on the market generally is only to be that set square or set square and protractor are combined, and higher grade pupils and middle school student just need possess compasses, set square in the school, otherwise just cannot draw, and carry trouble like this, use also inconvenience.

The purpose of this utility model is: in order to remedy above-mentioned the deficiencies in the prior art, design a kind of set square that has the compasses plate, two right-angle sides of set square engrave the ruler scale, in set square, engrave angle measuring calibration on the intracardiac circle, in inlay the compasses plate on the intracardiac circle, the compasses plate can be done circle, can justify under not with the situation of compasses like this, the convenient program of primary and secondary students' mappings.

Content of the present utility model is: compasses, protractor combined triangular chi are made up of set square, protractor, compasses plate, inlay a rotary circular compasses plate at the set square center, compasses plate center is the center of circle, around the center of circle is equidistant aperture, twist, the compasses plate rotate one week each aperture thereupon the track that rotates all be with one heart and the circle of different radii, at set square two right-angle sides, be carved with the ruler scale, in on intracardiac round week, be carved with 180 ° angle index.

The circumferential edge cross section of compasses plate is outstanding circular arc, and the surrounding edge cross section of intracardiac circle is recessed circular arc in the set square, and both match, and makes the compasses plate embed the centre and can fall, and can rotate.

On two right-angle sides on the set square, be carved with the ruler scale, on the inner periphery of set square center, be carved with 180 ° angle index.The cross section of intracardiac round periphery is recessed circular arc in the set square; On the compasses plate, the centre is the center of circle, it around the center of circle small sircle hole of 1 millimeter of distance, compasses plate circumferential section is outstanding circular arc, the compasses plate is embedded in the set square on the intracardiac circle, the recessed circular arc in intracardiac round week matches in outstanding circular arc of compasses plate and the set square like this, the compasses plate was both rotatable on the intracardiac circle in set square, but can not fall, both become a measurer, in case use, set square two right-angle sides are rulers, on the intracardiac circle protractor is arranged in the set square, the compasses plate that inlay the centre is not drawn circle again, nib is inserted in the corresponding circular hole behind the radius as long as determine, with finger push compasses plate, make the compasses plate rotate a week, just obtain the circle asked, and the center of circle of compasses plate is exactly the round center of circle of asking.

The utility model compared with prior art has following advantage: easy to carry, make simple, easy to use.

Description of drawings:

Fig. 1 is the schematic diagram of the utility model compasses, protractor combined triangular chi.

The utility model is described further in conjunction with the accompanying drawings:

Inlay a rotary circular compasses plate (2) having 30 ° of right angle triangle (1) centers with 60 °, compasses plate (2) center is to be equidistant aperture around the center of circle centers on the center of circle, twist, compasses plate (2) rotates all each apertures, on set square (1) two right-angle side, be carved with the ruler scale, in on intracardiac round week, be carved with 180 ° angle index, and the cross section on every side of compasses plate (2) is the circular arc of giving prominence to, intracardiac round all cross sections are recessed circular arc in the set square (1), two directly match, compasses plate (2) was embedded in the set square (1) in intracardiac round week, both can not fall, rotatable again, the surveying and mapping tool that becomes one.Compasses plate (2) is gone up and to be begun to be respectively 1,2,3,4,27 intersection points of making circle and center of circle ray for radius from the center of circle and make aperture, and adjacent two apertures are at a distance of 30 °, each aperture of being done like this twist, as long as the circle of being done is in this scope, rotate compasses plates (2) after just can only nib being inserted aperture, just obtain desired circle without compasses.

Claims

1, a kind of set square, form by set square, protractor, compasses plate, it is characterized in that inlaying a rotary circular compasses plate at the set square center, compasses plate center is the center of circle, is equidistant aperture around the center of circle, twist, the compasses plate rotate one week each aperture thereupon the track that rotates all be with one heart and the circle of different radii at set square two right-angle sides, is carved with the ruler scale, in on intracardiac round week, be carved with 180 ° angle index.

2, compasses according to claim 1, protractor combined triangular chi, the circumferential edge cross section that it is characterized in that the compasses plate is outstanding circular arc, and the circumferential edge cross section of intracardiac circle is recessed circular arc in the set square, and is corresponding with compasses plate circumferential edge, can do not fall in the middle of making the embedding of compasses plate, and rotatable.