CN2190033Y

CN2190033Y - Three uniform divider

Info

Publication number: CN2190033Y
Application number: CN 94227238
Authority: CN
Inventors: 伍炳元
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-03-03
Filing date: 1994-03-03
Publication date: 1995-02-22
Anticipated expiration: 2004-03-03

Abstract

The utility model relates to a drawing tool used for dividing an angle into three uniform parts. A main scale and a subsidiary scale are connected to form the three uniform divider by two locking devices. The main scale forms a T shape and has slot-shaped through groovs along the horizontal and the vertical directions. Two through holes are bore in the median line of the subsidiary scale, and the distance between the two through holes is 2 a. Two gaps whose length is a are arranged in the two sides of the subsidiary scale. The three uniform divider has the advantages that the structure is simple, the operation is convenient, and the control is easy. The utility model can divide exactly and has higher practical value in the engineering design and the actual work.

Description

Three uniform divider

The utility model relates to a kind of geometric construction instrument, belongs to stationery.

Want any angle of trisection in geometric construction, at present used drawing tool compasses, ruler, protractor can only be accomplished approximate cutting apart, and method more complicated also is not easy to grasp.Yet in engineering design and other real work, can not satisfy required requirement approximate often cutting apart.Therefore press for a kind of ruler of cutting apart the trisection of an angle accurate, easy to use.

The purpose of this utility model is to avoid above-mentioned weak point of the prior art, and a kind of trisection gauge accurate, easy to use, easy grasp of cutting apart is provided.

The purpose of this utility model is to reach by following measure: this trisection gauge is to be made of main scale, secondary chi and two locking devices, wherein the main scale profile is " T " font, and has the long hole shape chute of intercommunication in the centre of the vertical of this chi and horizontal direction; And secondary chi is a ruler that has two breach, simultaneously two through holes is arranged on the center line of this pair chi, and one of them through hole is positioned at the central authorities of secondary chi, and another through hole and it are a fixed length at a distance of 2a(a).Two breach are positioned at the both sides of secondary chi, and the length of breach is a, and the base line of two breach must be by the center of circle of middle that through hole on the secondary chi; Locking device is made up of the nut that bolt and head two ends have pointer.

Main scale of the present utility model and secondary chi can be made with lucite or plastics.

The drawing of accompanying drawing is described as follows:

Fig. 1 is a structure chart of the present utility model.

Fig. 2 is the part drawing of main scale.

Fig. 3 is the part drawing of secondary chi.

Fig. 4 is the part drawing of bolt.

Fig. 5 is the part front view of nut.

Fig. 6 is the vertical view of Fig. 5.

The utility model is described in further detail below in conjunction with embodiment: this trisection gauge is main scale (1) and secondary chi (2) and two locking devices (4) formation of being made by lucite, wherein the profile of main scale (1) is " T " font, and all has the chute (6) of long hole shape in the centre of the vertical of this chi and horizontal direction.And the profile of secondary chi (2) is a ruler that has two breach (3,5), be drilled with on the center line of this chi simultaneously two at a distance of for 2a(a be a fixed length) through hole (7,8), one of them through hole (7) is positioned at the central authorities of secondary chi (2), and another through hole (8) is positioned at the right-hand member of secondary chi (2).And two breach (3,5) are positioned at the both sides of secondary chi (2), and the length of breach (3,5) all is a, and the base line of two breach (3,5) should be gone up the center of circle of those through holes of central authorities (7) by secondary chi (2).Two bolts (10) pass on the main scale (1) long hole shape chute on the horizontal direction and the long hole shape chute on the vertical respectively after passing two through holes (7,8) on the secondary chi (2) respectively again.The nut (9) that has a pointer with the head two ends is screwed into bolt (10) then, can be with secondary chi (2) and main scale (1) locking.

This trisection gauge is to use like this: five equilibrium is during less than any angle of 180 degree, and wanting the angle of five equilibrium with this earlier is isosceles triangle that waist is a of drift angle work, do afterwards one with this perpendicular vertical line in isoceles triangle shape base.Then trisection gauge is placed in the plane at above-mentioned figure place, make the nut pointer tip that is positioned on the trisection gauge on the vertical, aim at the base of above-mentioned isosceles triangle, allow the nut pointer tip that is positioned on the third-class ruler on the horizontal direction aim at and the perpendicular vertical line in isosceles triangle base simultaneously, just main scale is maintained static then with hand, moving sets chi again, allow the summit of above-mentioned isosceles triangle drop on the breach base on the secondary chi left side, on the base of secondary chi the right breach, get work a bit again, just whole third-class ruler can be taken down, at last with ruler with the summit of isosceles triangle with got work just now that couple together.This straight line just equals 1/3rd of this isoceles triangle shape drift angle with the size at an angle that waist becomes of isosceles triangle.And then the drift angle of remainder halved, just finished any trisection of an angle.During greater than any angle of 180 degree, its using method and five equilibrium are basic identical less than the method at 180 any angles of spending for five equilibrium.Only the nut pointer tip that is positioned at horizontal direction on the trisection gauge being shifted onto the left side of main scale horizontal direction, allowed the summit of isosceles triangle drop on the breach base on secondary chi the right simultaneously, is to obtain on the breach base on the secondary chi left side and ask the work point.

The utility model has following advantage compared to existing technology: this trisection gauge is not only simple in structure, and is easy to use, grasps easily, and cuts apart accurately, and the circular arc of any length also can be cut apart in angle that can the trisection arbitrary size. It has higher practical value in engineering design and real work.

Claims

1, a kind of trisection gauge that is made of main scale (1), secondary chi (2) and two locking devices (4) is characterized in that main scale (1) profile is " T " font, and has the long hole shape chute (6) of intercommunication in the centre of the vertical of this chi and horizontal direction; And secondary chi (2) is a ruler that has two breach (3,5), two through holes (7,8) are arranged on the center line of this pair chi (2) simultaneously, one of them through hole (7) is positioned at the central authorities of secondary chi (2), another through hole (8) and it are at a distance of 2a (a is a fixed length), two breach (3,5) lay respectively at the both sides of secondary chi (2), the length of breach all is a, and the base line of two breach (3,5) must be gone up the center of circle of those through holes of central authorities (7) by secondary chi (2); Locking device (4) is made up of the nut (9) that bolt (10) and head two ends have pointer.

2, trisection gauge according to claim 1 is characterized in that main scale (1) and the available lucite of secondary chi (2) or plastics make.