CN201105588Y - multi-purpose protractor - Google Patents

Abstract

The utility model discloses a multipurpose protractor, which is a semicircle enclosed by a bottom edge and an arc edge, wherein an arc scale mark parallel to the arc edge is marked on the semicircle made of transparent material, 0-180 degrees are evenly marked on the arc scale mark, and two intersection points of the arc scale mark and the bottom edge are evenly marked with-1 from left to right; a perpendicular bisector perpendicular to the bottom edge intersects the arc scale line at an angle of 90 degrees; scales from 0 to 1 are uniformly scaled from the perpendicular point to the intersection point; and (4) leading out rays from the middle vertical point to the arc scale line to intersect with the arc edge, and marking the tangent value of the corresponding angle at the intersection point. Utilize the utility model discloses can be convenient seek sine, cosine, tangent, the cotangent value of measuring angle, can also regard as the ruler to use, measure object length, realize the multipurpose.

Description

multi-purpose protractor

【Technical field】

The utility model relates to the field of surveying and mapping tools, in particular to a multi-purpose protractor.

【Background technique】

Existing surveying and mapping tools generally have a single function, and common ones include rulers, set squares, and protractors. Usually it is easy to use multiple surveying and mapping tools at the same time in study and work, so it is often necessary to be equipped with various tools. Because there are many tools and various shapes, it is inconvenient to carry.

Moreover, in some on-site measurement calculations, it is necessary to directly know the value of the trigonometric function corresponding to the measured angle, but it is very inconvenient to carry a calculator or look up the trigonometric function table.

【Content of utility model】

Aiming at the above-mentioned defects of the prior art, the utility model provides a multi-purpose protractor for conveniently querying the trigonometric function value corresponding to the measured angle.

In order to solve the above technical problems, the utility model is achieved through the following technical solutions:

A multi-purpose protractor, which is a semicircle surrounded by a base and an arc, an arc scale line parallel to the arc is marked on the semicircle of transparent material, and the uniform scale of 0°～180° is on the arc scale line, the two intersecting points of the arc scale line and the bottom edge are evenly marked with -1~1 from left to right; The uniform scale between the point and the intersection point is 0~1; starting from the sag point to the arc scale line, the ray is drawn to intersect the arc edge, and the tangent value of the ray passing angle is marked at the intersection point.

Preferably, the vertical foot intersects with the bottom edge and the mid-perpendicular line on the arc-shaped scale line respectively.

Preferably, a tangent arc parallel to the arc edge and between the arc edge and the arc scale line intersects with the ray drawn from the vertical point to the arc scale line, and the cotangent of the corresponding angle is marked at the intersection point value.

Preferably, the bottom edge is also marked with a length scale value whose minimum scale is millimeters.

As can be seen from the above technical solutions, the utility model marks the corresponding tangent and cotangent values of the angle on the peripheral line, so after measuring a certain angle, the corresponding tangent and cotangent values and the length scale value of the bottom can be found immediately Can also be used as distance measurement. Simultaneously, because the utility model respectively makes vertical foot intersect with bottom edge and mid-perpendicular line on arc scale line, can find out the cosine, sine value of corresponding angle according to the data of vertical foot point.

【Description of drawings】

Accompanying drawing is a schematic diagram of the new structure of this application.

【Detailed ways】

The utility model will be described in further detail below in conjunction with specific embodiments.

Referring to the accompanying drawings, the use of the novel multi-purpose protractor includes a semicircle surrounded by a bottom edge 11 and an arc edge 12, and an arc-shaped scale line 13 parallel to the arc edge 12 is engraved on the semicircle of a transparent material, 0°～180° are evenly marked on the arc-shaped scale line 13, and the two intersection points of the arc-shaped scale line 13 and the bottom edge are evenly marked with -1～1 from left to right; one is perpendicular to the bottom edge 11 The vertical line 14 intersects the arc scale line 13 at the 90° scale; the uniform scale between the vertical point and the intersection point is 0～1; The intersection point is marked with the tangent value of the corresponding angle; the bottom edge 11 is also marked with a length scale value whose minimum scale is millimeter.

In order to measure the sine value and the cosine value, the arc scale line 13 is used as a foot to the vertical line 14, intersects with the mid-perpendicular line 14, and the scale corresponding to the intersection point is the sine corresponding to the angle indicated on the arc scale line 13 value; the arc scale line 13 makes a vertical foot towards the bottom edge 11, intersects with the bottom edge 11, and the scale corresponding to the intersection point is the cosine value corresponding to the angle indicated on the arc scale line 11, which can be found immediately after a certain angle is measured The corresponding sine and cosine values bring great convenience to work and life. Among them, the accuracy of the sine and cosine value marking is proportional to the size of the protractor, the larger the protractor, the finer the marked scale.

As a preferred mode of the present utility model, a tangent arc 15 parallel to the arc edge and between the arc edge and the arc scale line intersects with the ray drawn from the vertical point to the arc scale line 13. Points are marked with the cotangent of the corresponding angle.

Wherein, the length scale marked on the bottom edge can be used for drawing a straight line and measuring the distance between two points.

The marking data shown on the panel of the utility model, wherein the sine value and cosine value are directly obtained according to the definition of sine and cosine, that is, shown on the sin and cos axes, and the tangent value and cotangent value are based on the ratio of sine and cosine , The ratio of cosine and sine is obtained.

The above-mentioned embodiments only express several implementation modes of the present utility model, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the patent scope of the present utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the scope of protection of the utility model patent should be based on the appended claims.

Claims (4)

1, a kind of multiple use angle protractor, it is the semicircle that a base and an arc limit surround, it is characterized in that: a curved scale line subscript parallel with the arc limit is engraved on the semicircle of transparent material, 0 °～180 ° even scales are at this curved scale line, and two joinings on described curved scale line and base are evenly marking-1～1 from left to right; The perpendicular bisector and the curved scale line that fall in the base in one intersect at 90 °; In hang down point to even scale 0～1 between this intersection point; Therefrom hanging down to pointing out is dealt into the curved scale line to draw ray crossing with the arc limit, indicates the tangent value that ray passes angle at this intersection point.

2, multiple use angle protractor according to claim 1 is characterized in that: make intersection point respectively on the described curved scale line and give base and perpendicular bisector mutually.

3, multiple use angle protractor according to claim 1, it is characterized in that: one is parallel to arc limit and the tangent camber line between arc limit and curved scale line, it is dealt into the curved scale line and draws ray and intersect with therefrom hanging down to pointing out, and indicates the cotangent value of respective angles in joining.

4, multiple use angle protractor according to claim 1 is characterized in that: described base also is marked with the length scale value of minimum scale for millimeter.