CN2187554Y

CN2187554Y - Multi-purpose set square

Info

Publication number: CN2187554Y
Application number: CN 94211718
Authority: CN
Inventors: 刘海深
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-05-06
Filing date: 1994-05-06
Publication date: 1995-01-18
Anticipated expiration: 2004-05-06

Abstract

The utility model relates to a multi-purpose set square. A chute is arranged below the graduation of the long side of the set square, and two slide blocks are arranged in the chute, wherein, a rope is tied on the slide block arranged at the inside, and the other end of the rope is penetrated from the outer end of the chute. The center of the set square is provided with a graphometer of which the center is provided with a small shaft on which a pointer is fixed; the pointer can be rotated around the small shaft. A section of parabola is arranged at one short edge of a triangle. The utility model has the advantages of simple structure and multiple functions; the multi-purpose set square is especially suitable for teaching.

Description

Multi-purpose set square

The utility model relates to a kind of set square, especially a kind of multi-functional triangular ruler.

At present, the set square that existing teacher uses is that it can only draw straight line and special angle by 30 °, 60 °, 90 ° and two 45 °, 90 ° two kinds of right angled triangle chis that constitute.Draw bowlder as the teacher, also need to take in addition compasses, draw ellipse and parabola and just more bothered.

The purpose of this utility model is to provide a kind of multipurpose set square at above-mentioned defective, and it can draw triangle at any angle, and can draw circle, ellipse and parabola.

The purpose of this utility model is achieved in that

The utility model has a chute below the scale on the long limit of set square, two slide blocks are arranged in the chute, is that a rope is arranged on the slide block inside wherein, and the other end of rope passes from the outer end of chute; There is a graphometer at the center of set square, and the graphometer center is provided with a little axle, and being fixed with one on the little axle can have one section to be parabola around the pointer of its rotation on the leg-of-mutton minor face.

The utility model can be used for the picture circle owing to adopt said structure, and ellipse, parabola, parallel lines reach triangle at any angle, have characteristics simple in structure, easy to use.

Below in conjunction with drawings and Examples the utility model is further specified:

Fig. 1 is a front view of the present utility model.

Fig. 2 is that the A-A of Fig. 1 is to figure.

Among the figure: 1, blade, 2, slide block, 3, rope, 4, scale, 5, chute, 6, handle, 7, projection, 8, little axle, 9, pointer, 10, slide block, 11,12, graphometer, 13, fake, 14, parabola.

See Fig. 1-2, there is scale 4 on the long limit of set square blade 1, one straight runner 5 is arranged below the scale 4, two slide blocks 2,10 are arranged in the chute 5, wherein by being that a rope 3 is arranged on the slide block 2 of inner end (left end among the figure), the other end of rope 3 passes from the outer end (right-hand member of chi the figure) of chute 5 and is to have a circle to be convenient to overlap chalk; When drawing bowlder, rope 3 is pulled out required radius length, be that the center of circle can the picture circle with the right-hand member of chi.When drawing ellipse, rope is pulled out, with the snare of its outer end on outer end slide block 10, fixed a point as two in the position of two slide blocks, (during manufacturing, the groove of two slide block lower ends and slideway have certain pretightning force, the plasticity of reliable plastics self realizes, like this, if without the hand push slide block, it can arbitrarily not slide).Rope can the picture ellipse as boning out.There is an arch hole centre of blade 1, and there is a projection 7 at the center of this hole straight line, and a little axle 8 perpendicular to blade 1 is arranged on the projection 7, and an end of pointer 9 is pointed, and the other end has two rings.Be enclosed within the two ends of little axle 8 respectively, and can relatively little axle 8 rotations.Two transparent graphometers 11,12 are bonded at the both sides in arch hole, and the hole is sealed.When drawing parallel lines or during triangle, because pointer 9 gravitates refer to all the time vertically downward, so the angle of blade rotation can read from graphometer, thereby the corresponding oblique line that can draw is as required finished and drawn parallel lines or the purpose of arbitrary triangle.

There is one section to be parabola 14 on the leg-of-mutton minor face, by the upset ruler, positive and negative picture, a complete parabola can draw.

The straight line of graphometer is perpendicular to the long limit of set square among the figure, and the angle excursion that can draw is big, and when the little figure of picture angle excursion, the graphometer straight flange can be parallel to the long limit of set square, and the arc limit is provided with downwards.

Claims

1, a kind of multipurpose set square is characterized in that: below the scale on the long limit of set square a chute being arranged, two slide blocks are arranged in the chute, wherein is that a rope is arranged on the slide block inside, and the other end of rope passes from the outer end of chute; The center of set square is provided with graphometer, and the graphometer center is provided with a little axle, and being fixed with one on the little axle can have one section to be parabola around the pointer of its rotation on the leg-of-mutton minor face.