CN2474346Y - Apparatus for trisection of arbitrary angle - Google Patents

Abstract

Provided is a device for trisecting any angle. The utility model belongs to stationery, in particular to a ruler which can precisely draft out trisectrixs of any angle without usage of an angle gage. The device for trisecting any angle is provided with a transparent ruler board, and two mutually perpendicular straight-lines are carved on the transparent ruler board, further equidistant identification points are respectively provided on transverse lines of the left end and the right end of pedals. An arc identification line is provided in the right direction of the perpendicular line of the ruler board, a center of the arc identification line is the right identification point, and the radius of the arc identification line is the distance between the pedal and the center. The utility model has the advantages of simple structure, convenient usage, low costs and capability of precise trisection of any angle.

Description

Any angle of trisection instrument

The utility model belongs to stationery, does not particularly adopt protractor just can accurately draw in a big way the ruler of trisection of an angle line arbitrarily.

In geometrical learning and some actual production processing, often an angle need be carried out trisection accurately, and this geometric construction operation is a difficult problem for a long time always.In the reality mapping, people normally adopt protractor to realize trisection, and the angular accuracy that this instrument is told is relatively poor, and not high operation can only meet the demands; Carrying out accurately waiting timesharing, generally to adopt special instrument, its price is more expensive, and troublesome poeration is not suitable for numerous students and plant operations workman and uses.

The purpose of this utility model is any angle of an a kind of trisection instrument, and it is simple in structure, and is easy to use, and cost is low, can be at the accurate any angle of trisection in a big way.

Implementation of the present utility model is: adopt the transparent material flat panel production, stamp has two orthogonal straight lines on the chi plate, on the horizontal line of the left and right two ends of intersection point an equidistant identification point is arranged respectively, right-hand at the perpendicular vertical line of chi plate, having with right identification point is the center of circle, arrives curtate distance from a circular arc tag line that is radius.During use, maintenance is being erected on the vertical line by the summit of sub-multiple angle, the left side at angle overlaps with the left identification point of chi plate, the right at angle and chi plate circular arc line are tangent, thereby the line at summit, each identification point and point of contact has just constituted three congruent triangles, with the draw line of summit and each identification point of ruler, the accurate any angle of trisection just.

Below, the specific embodiment of the present utility model according to Figure of description provides is further described its structure.

Referring to Fig. 1, this drawing instrument adopts transparent material flat board (as transparent plastic sheet) to make, stamp has two orthogonal straight line HF and GI on chi plate 1, on intersection point F and arranged on left and right sides horizontal line GI, an equidistant identification point G and an O arranged respectively, on chi plate 1 perpendicular vertical line HF right side, having with right identification point O is the center of circle, is a circular arc tag line L of radius to intersection point F distance.For the ease of the point on the bisector of drawing, the intersection point F of chi plate 1 and right identification point O place should have small through hole, nib can be inserted small through hole in the use, and corresponding point draws.Carry this instrument for the ease of the student, guarantee enough drawing accuracy again simultaneously, the lateral dimension of chi plate 1 is 60～90mm, and vertical dimension is 70～110mm.When desiring trisection ∠ BAC, the perpendicular vertical line HF of this chi plate 1 can be kept overlap with A point, attachable mechanical stage plate 1 makes its left identification point G overlap with the AB limit at angle, while circular arc tag line L and ^ACThe limit is tangent, so just can form triangle △ AGF, △ AFO and the △ AOH of three congruences, the purpose of any angle ∠ ABC that also just reached accurate five equilibrium.

From technique scheme of the present utility model, this drawing tool is simple in structure, and is easy to manufacture, easy and simple to handle, can be fast and accurately to the diffusing five equilibrium in any angle in a big way.

Claims (3)

1, any angle of a kind of trisection instrument, it is characterized in that stamp has two orthogonal straight lines on the transparent ruler plate, on the horizontal line of the left and right two ends of intersection point an equidistant identification point is arranged respectively, right-hand at the perpendicular vertical line of chi plate, having with right identification point is the center of circle, arrives curtate distance from a circular arc tag line that is radius.

2, by any angle of the described trisection of claim 1 instrument, it is characterized in that the intersection point of chi plate and right identification point place have small through hole.

3, by any angle of the described trisection of claim 2 instrument, the lateral dimension that it is characterized in that the chi plate is 60～90mm, and vertical dimension is 70～110mm.