CN2581197Y - Angle gauge - Google Patents

Abstract

The utility model relates to stationery which is an angle gauge used for primary and middle school students. The utility model is characterized in that the utility model is composed of three identical straight rulers which are connected together, and the straight ruler can be made of transparent materials, such as transparent plastics and organic glass. Both ends and the middle of each straight ruler is respectively provided with a connecting screw hole, and the three straight rulers are connected together by manually operating screw caps and screws. The straight ruler can rotate around a connecting point. Evenly distributed angular measuring scale lines are arranged around head and tail screw holes of each straight ruler. A transverse center line with the length of 20 centimeters is arranged on the straight ruler. Length scales are graved above and under the transverse center line. The angle gauge of the utility model used as the stationery for the students can replace straight rulers and protractors and is used for measuring sine, cosine, tangent and cotangent trigonometric function value. Two straight rulers are connected end-to-end for drawing any acute angle and measuring angles.

Description

Angle gauge

Technical field

The utility model relates to a kind of stationery---angle gauge of middle and elementary school student study usefulness.

Background technology

At present, primary and secondary students' learning mathematics, how much study stationery, tradition is sold on the market ruler, set square, protractor etc., and these stationery only can be used to measure length, angle.

Summary of the invention

The purpose of this utility model is to be middle and elementary school student learning mathematics, how much, provides a kind of and can replace ruler, protractor, can also measure the angle gauge of four kinds of trigonometric function values of sine, cosine, tangent, the cotangent of angle of departure.

The utility model angle gauge content Description:

The utility model angle gauge, it is characterized in that: be to be formed by connecting by three identical rulers, ruler can adopt transparent material such as transparent plastic, lucite to make, and with the centre screw of connection is arranged at its two ends, be connected by manual nut, screw, ruler can rotate around tie point; Around the head and the tail screw of each ruler, have uniform angle measuring calibration line, horizontal center line is set on the ruler, length is 20 centimetres, is carved with the length scale at the upper and lower of horizontal center line.

The utility model angle gauge is used stationery as a kind of student, can substitute ruler, protractor, is used for sine, cosine, the tangent of measured angular, four kinds of trigonometric function values of cotangent.With two rulers any acute angle and taking measurement of an angle of to draw that joins end to end.

Description of drawings

Fig. 1 is the angle gauge connection status structural representation that two rulers constitute

Fig. 2 is the ruler structural representation

Fig. 3 is the angle gauge connection status structural representation that three rulers constitute

Fig. 4 is the angle gauge connection status structural representation that three rulers constitute

Among the figure: 1 is that ruler, 2 is that connection screw, 3 is that angle measuring calibration line, 4 is that horizontal center line, 5 is that length graduation mark, 6 is that manual nut, 7 is a screw.

The specific embodiment

The utility model is to realize like this, see that Fig. 1 ruler structural representation, Fig. 2 are the angle gauge connection status structural representation that two rulers constitute, ruler 1 can adopt transparent material such as transparent plastic, lucite to make, in its two ends and centre the screw of connection 2 is arranged, be connected by manual nut 6, screw 7, ruler 1 can rotate around connecting screw 2 tie points; Around the head and the tail screw of each ruler 1, have uniform angle measuring calibration line 3, have horizontal center line 4 on the ruler, length is 20 centimetres, is carved with length scale 5 at the upper and lower of horizontal center line 4, an independent ruler can substitute ruler and protractor.The angle gauge that constitutes with two rulers can take measurement of an angle easily and be used for the picture angle.

Seeing Fig. 3, Fig. 4, is the angle gauge connection status structural representation that three rulers constitute, and is after being joined end to end by two rulers, screw in the middle of second ruler is connected on the head end of the 3rd ruler again.

Getting hypotenuse when measuring sinusoidal, cosine value is 10 centimetres of form right angle triangle two right-angle sides, and two acute angle values come into plain view, and length sinusoidal, that cosine is two right-angle sides is removed the organization decimal point, and to be moved to the left one value be sine, the cosine function value at angle.

When measuring tangent, cotangent value, getting a right-angle side is 10 centimetres of form right angle triangles, then tangent, cotangent functional value are the ratio of two right-angle sides, getting the pairing right-angle side of denominator is 10 centimetres, and then the length of another right-angle side is removed the organization decimal point to be moved to the left one value is tangent of an angle, cotangent functional value.

Claims (1)

1, a kind of angle gauge, it is characterized in that: be to be formed by connecting by three identical rulers, ruler can adopt transparent material such as transparent plastic, lucite to make, and with the centre screw of connection is arranged at its two ends, be connected by manual nut, screw, ruler can rotate around tie point; Around the head and the tail screw of each ruler, have uniform angle measuring calibration line, horizontal center line is set on the ruler, length is 20 centimetres, is carved with the length scale at the upper and lower of horizontal center line.

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