CN2412757Y

CN2412757Y - Set square comdined protractor and compasses

Info

Publication number: CN2412757Y
Application number: CN 00219067
Authority: CN
Inventors: 崔辉明
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-01-03
Filing date: 2000-01-03
Publication date: 2001-01-03
Anticipated expiration: 2010-01-03

Abstract

The utility model relates to an angle square sector, which combines the functions of a protractor, a set square and a pair of compasses. The angle square sector is improved on the basis of a set square, a bevel edge of the angle square sector can rotate along a notched shaft and can be used as a leg of a pair of compasses, and the leg forms a pair of compasses together with the other retractable leg that is attached on a right-angle edge which is labeled with scales for length, angle and radius. The utility model can demonstrate angles and triangles, and can also be used as a drawing board stroke to draw closed angles and right triangles with an arbitrary or specified angle. For a closed angle that is not larger than 45DEG, accurate measurement on even short edges still can be achieved quickly. When the leg of the sector is locked, the radius dimensions can be ensured not deviated when drawing circles, and the radiuses of the drawn circles can be directly read out.

Description

Set square comdined protractor and compasses

The utility model belongs to a kind of stationery.

In present stationery, set square, protractor, compasses all separate separately, function singleness, and taking, putting is very much inconvenience, has usually taken so again poor such.

The purpose of this utility model provides a kind of " three-in-one " stationery that set square, protractor, compasses are combined into one, and one-object-many-purposes has avoided common discrete stationery to carry the shortcoming of inconvenience.

The purpose of this utility model is achieved like this: at the hypotenuse and a right-angle side connecting place of set square, axle with pointed breach is arranged, the through axle center of breach point, hypotenuse can rotate and as a pin of compasses around this, and is attached to that retractable another pin constitutes compasses on the right-angle side; Be marked with the number of degrees and the drawn radius of a circle of a place right-angle side and hypotenuse angle at another right-angle side; The angle index of inboard mid point of hypotenuse and angle square inboard constitutes protractor.

Owing to adopt such scheme, can demonstrate angle and any right angled triangle, show drawn radius of a circle, can draw fast arbitrarily or the acute angle and the right angled triangle of specified angle by unicursal again, make set square comdined protractor and compasses not only have all functions of protractor, set square, compasses, and increased many new functions and entertaining.

The utility model is described in further detail below in conjunction with drawings and Examples.

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

Fig. 2 is I-I cutaway view of Fig. 1.

Fig. 3 is I-I cutaway view of Fig. 2.

Among the figure: 1. leading role's chi limit 2. secondary angle square limit 3. movable hypotenuse 4. "? " most advanced and sophisticated 16. stitch axles, 17. set screws of shape elbow 5. notched axle 6. retractable stitch 15. times elbow sheets in 14. lower ends of inboard mid point 10. angle indexs, 11. length scale 12. angle scales, the 13. radius scales of retaining 8. trough of belt arc backplates 9. hypotenuses, 7. location.

In Fig. 1, the angle square both sides equate, leading role's chi limit 1 is marked with length scale 11, on the movable hypotenuse 3 "? " arranged shape elbow 4 is embraced on notched axle 5 and is clamped leading role's chi limit, 315 ° of last elbow sheet cornerites by upper and lower two elbow sheets, 285 ° of following elbow sheet cornerites, and have 15 ° of tips 15 in through axle center, 60 ° of the pointed breach angles in the 14 through centers of circle, axle 5 lower ends, 45 ° of axle remainder breach angles.Elbow 4 rotates around axle 5, makes hypotenuse 3 and leading role's chi limit 1 constitute the angle, both can demonstrate the angle, can measure again and be not more than 45 ° acute angle, also can accurately measure even the limit at angle is very short, and the angle number of degrees are read by angle scale 12 on the arrow indication arc backplate 8.The 2 groups of any right angled triangles in above-mentioned two limits and secondary angle square limit are owing to according to right angled triangle two acute angle complementarity principles, can draw arbitrarily or the acute angle and the right angled triangle of specified angle at inboard unicursal in following elbow sheet most advanced and sophisticated 15 through axle center.Angle is opened to 45 °, and the inboard mid point 9 of hypotenuse constitutes protractor with the inboard angle index 10 of angle square.But cast-over pin axle 16 puts down folding and unfolding stitch 6, screws nut and fixes, and the position is determined by location retaining 7; Rotation activity hypotenuse 3 is to the appropriate location, and the set screw 17 that screws on it can fix radius picture circle, and its radius is read by the radius scale 13 on the arrow indication arc backplate 8.

Claims

1, a kind of set square comdined protractor and compasses, with the set square is that the basis improvement forms, it is characterized in that: at the hypotenuse and a right-angle side connecting place of set square, axle with pointed breach is arranged, the through axle center of breach point, hypotenuse can rotate and as a pin of compasses around this, and is attached to that retractable another pin constitutes compasses on the right-angle side; Be marked with the number of degrees and the drawn radius of a circle of a place right-angle side and hypotenuse angle at another right-angle side, the angle index formation protractor of the inboard mid point of hypotenuse and angle square inboard.

2, set square comdined protractor and compasses according to claim 1, it is characterized in that: major and minor angle square limit is isometric, the part of swaying for clamp leading role's chi limit up and down two-layer "? " shape elbow sheet, 315 ° of upper strata elbow sheet cornerites, 285 ° of lower floor's elbow sheet cornerites, and with 15 ° of tips in a through axle center, 60 ° of corresponding axle lower end breach angles, 45 ° of axle remainder breach; But the folding and unfolding compass foot cast-over pin axle that invests on leading role's chi limit rotates and puts down, and its position is determined by the location retaining; The trough of belt arc backplate of restricted hypotenuse scope of activities has the set screw of clamping the groove both sides on the secondary angle square limit on the movable hypotenuse.