CN201105588Y

CN201105588Y - Multipurpose protractor

Info

Publication number: CN201105588Y
Application number: CNU2007200572701U
Authority: CN
Inventors: 常碾甫
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-09-21
Filing date: 2007-09-21
Publication date: 2008-08-27
Anticipated expiration: 2017-09-21

Abstract

The utility model discloses a multi-purpose protractor, which is a semicircle enclosed by a bottom edge and an arc edge; an arc-shaped scale marker, which is parallel with the arc edge, is arranged on the semicircle made of transparent material by marking, 0 degree to 180 degrees are uniformly marked on the arc-shaped scale marker, two crosspoints of the arc-shaped scale marker and the bottom edge are uniformly marked with minus 1 to 1 from left to right, a perpendicular bisector, which is perpendicular to the bottom edge, is crossed with the arc-shaped scale marker at 90 degrees; 0 to 1 is evenly marked between a perpendicular point and the crosspoint, a ray is induced to be crossed with the arc edge from the perpendicular point to the arc-shaped scale marker, and the crosspoint is marked with tangent value of the corresponding angle. By adopting the multi-purpose protractor, the sine value, the cosine value, the tangent value and the cotangent value of an angle to be measured can be found out conveniently; the multi-purpose protractor can also be used as a ruler to detect the length of an article, thus realizing multiple purposes.

Description

Multiple use angle protractor

[technical field]

The utility model relates to the surveying and mapping tool field, relates in particular to a kind of multiple use angle protractor.

[background technology]

Existing surveying and mapping tool is function singlenesses all generally, and common have ruler, set square, a protractor.Usually in study and work, run into easily and use multiple surveying and mapping tool simultaneously, therefore often need to be equipped with various tool.Because instrument is numerous, shape is various, gives to carry and makes troubles.

And under some in-site measurements calculate, need directly know the trigonometric function value of tested angle correspondence, yet carry calculator or look into trigonometric table very inconvenient again.

[utility model content]

The utility model provides a kind of multiple use angle protractor at the above-mentioned defective of prior art, with the convenient trigonometric function value of inquiring about institute's angle measurement degree correspondence.

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

A kind of multiple use angle protractor, it is the semicircle that a base and an arc limit surround, the one curved scale line subscript parallel with the arc limit is engraved on the semicircle of transparent material, and 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.

Preferably, make intersection point respectively on the described curved scale line and give base and perpendicular bisector mutually.

Preferably, one is parallel to arc limit and the tangent camber line between arc limit and curved scale line, and 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.

Preferably, described base also is marked with the length scale value of minimum scale for millimeter.

As can be seen from the above technical solutions, the utility model marks tangent, the cotangent value of angle correspondence at object-line, so can find corresponding tangent, cotangent value immediately after measuring certain angle, and the length scale value on base can also be used as range measurement.Simultaneously, because the utility model is made intersection point respectively and given base and perpendicular bisector mutually on the curved scale line, can find cosine, the sine value of corresponding angle according to the data of intersection point point.

[description of drawings]

Accompanying drawing is this use new structure schematic diagram.

[specific embodiment]

Below in conjunction with the specific embodiment the utility model is described in further detail.

Shown in accompanying drawing, this use novel multi-use protractor is included as the semicircle that a base 11 and an arc limit 12 surround, and one curved scale line 13 subscripts parallel with arc limit 12 be engraved on the semicircle of transparent material, 0 °～180 ° even markings on curved scale line 13, the from left to right evenly marking-1～1 of two joinings on described curved scale line 13 and base; The perpendicular bisector 14 that falls in base 11 in one intersects at 90 ° of scales with curved scale line 13; In hang down point to even scale 0～1 between this intersection point; Therefrom hanging down to pointing out is dealt into curved scale line 13 to draw ray crossing with arc limit 12, indicates the tangent value of respective angles at this intersection point; Described base 11 also is marked with the length scale value of minimum scale for millimeter.

For measuring sine value and cosine value, described curved scale line 13 is made intersection point to perpendicular bisector 14, intersects with perpendicular bisector 14, and the scale of intersection point correspondence is the sine value of indicating the angle correspondence on the curved scale line 13; Curved scale line 13 is made intersection point to base 11, intersect with base 11, the scale of intersection point correspondence is the cosine value of indicating the angle correspondence on the curved scale line 11, can find corresponding sine and cosine value immediately after measuring certain angle, all brings great convenience for work and life.Wherein, the precision of sine, cosine value marking is directly proportional according to the size of protractor, and protractor is big more, and institute's marking scale is meticulous more.

As optimal way of the present utility model, one is parallel to arc limit and the tangent camber line 15 between arc limit and curved scale line, and it is dealt into curved scale line 13 and draws ray and intersect with therefrom hanging down to pointing out, and indicates the cotangent value of respective angles in joining.

Wherein, the length scale of marking can be with drawing a picture straight line and measure the distance of point-to-point transmission on the base.

Marking data shown on the utility model panel, wherein sine value, cosine value for according to just, the cosine definition directly draws, promptly on sin, cos axle, illustrate, and tangent value, cotangent value are for being worth with cosine ratio, cosine and sine ratio according to sinusoidal.

The above embodiment has only expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the utility model design, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.

Claims

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.