CN2485155Y

CN2485155Y - Straight angular ruler

Info

Publication number: CN2485155Y
Application number: CN 01240442
Authority: CN
Inventors: 侯俊峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-05-24
Filing date: 2001-05-24
Publication date: 2002-04-10
Anticipated expiration: 2011-05-24

Abstract

The utility model relates to a measuring tool, in particular to a ruler shape angle ruler. The key techniques are that: one end of the straight suture ruler is provided with axis rotating points. One side of the ruler is provided with angle scales while the other side is provided with beeline distance scales. The division of the angle scales is based as the formula of the trigonometric function that MX=1/2L plus ctga/2. The utility model marks the angle as the ruler form, thereby not only being used as the ruler, but also being used as the angle ruler, having simple structure and convenient use.

Description

Ruler shape bevel protractor

The utility model relates to a kind of tolerance instrument, and particularly a kind of straight line tolerance of can either carrying out can be carried out the ruler shape bevel protractor that angle is measured again.

At present, people use and commercially available measurement facility, generally are divided into linear pattern measurement facility and angle type measurement facility.The linear pattern measurement facility can measure straight line spacing, carry out the line of quantitative length, as ruler, set square etc.; The angle type measurement facility can measure existing angle size, carry out determining and delimiting of different angles, as graphometer etc.The combination metric instrument that also has graphometer to be enclosed within to be formed centrally in the set square promptly can utilize set square right-angle side tolerance, delimit straight line, also can utilize wherein the graphometer tolerance of alignment to delimit angle.In sum, the instrument of existing these metric segments and angle, always ruler is limited to the tolerance and the delimitation of straight line, can not carry out the tolerance and the delimitation of angle, and bevel protractor can not be made the linear of ruler.This has often brought many deficiencies to people in actual life.As straightening chi in pupil's the pencil box, also to put other schooling apparatus such as graphometer, gave originally and just added a little weight in very heavy student's school bag.

The purpose of this utility model provides a kind of ruler shape bevel protractor, straight line is measured scale and angle tolerance scale be engraved on respectively on the ruler, utilizes this ruler promptly can measure the delimitation straight line, can measure the delimitation angle again, fully overcomes the deficiencies in the prior art.

Realization of the present utility model: be described further below in conjunction with accompanying drawing.

Accompanying drawing 1 is the utility model structure structural map.

Accompanying drawing 2 delimited schematic diagram for the utility model angle index.

Accompanying drawing 3 is the utility model set square shape bevel protractor (embodiment).

As shown in Figure 1, an end of straight shape chi is provided with pivot point (O), and a side is angle index (I), another side is air line distance scale (II). The concrete delimitation of angle index (I) is root Try to achieve according to the conversion of trigonometric function relation formula. As shown in Figure 2, wide such as chi is L, needs to determine the α angle The X point of degree just will be determined the distance of MX. At first draw with air line distance scale (II) side Straight line, MN are the wide L of chi that determines, form α when straight shape chi turns clockwise with drawing straight line NX ' Angle, namely during ∠ NX ' M '=α, Δ OM ' X ' ≌ Δ ONX ' then, NX '=M ' X '=MX, Tg α/2=ON/NX ' then, MX=NX '=ONctg α/2=1/2MNctg α/2=1/2Lctg α/2, wherein MN=L is the preset parameter of straight shape chi own, given different α angle then can be obtained The position that corresponding X is ordered. Be 60 ° such as given α angle, establish the wide MN=L=3cm of chi, then MX=1/2 * 3 * ctg30 °=2.598cm. Then delimit 60 ° scale at this X point place. The like, get final product Mark all angle indexs (I).

With this principle can also be with ruler angular dimension scale on other straight shape chi, carry out angle Delimit and measure.

Embodiment 1, as shown in Figure 3, on 30 ° right angle triangle, selected respectively two pivot point (O ₁, O ₂), hypotenuse angular dimension≤40 °, long right-angle side angular dimension is between 40 ° and 180 °.Using method and ruler shape bevel protractor are similar.

Advantage of the present utility model and good effect: 1. a chi is multiplex, both can be used as ruler, can do again Bevel protractor is used; 2. enrich the use approach of straight shape chi, enlarged the range of application of straight shape chi; 3. tie Structure is simple, and is easy to use.

Claims

1, a kind of ruler shape bevel protractor is characterized in that: an end of straight shape chi is provided with pivot point (O), and a side is angle index (I), and another side is air line distance scale (II).

2, ruler shape bevel protractor according to claim 1 is characterized in that: the concrete delimitation of angle index (I) is to convert according to trigonometric function relation formula MX=1/2Lctg α/2 to try to achieve.