CN202557073U - Ruler with drawing circle function - Google Patents

Abstract

The utility model discloses a ruler with a drawing circle function. A small hole is arranged at the zero graduation position of a central line of an upper plane of the ruler to serve as a centre point, a straight groove is arranged on the central line of the upper plane of the ruler, and side lines on two sides of the straight groove are manufactured to be in a sawtooth shape. During usage, two pencils are required, one pencil is inserted into the small hole of the centre point of the ruler to serve as a centre point, the other pencil is inserted into a tooth root which corresponds to a drawn circle radius value and draws a circumference line on a drawing paper around the centre point by abutting to the tooth root, a standard circle can be drawn, and thereby an aim of drawing the circumference line by the ruler can be achieved.

Description

Take the ruler of making the circle function

Technical field

The utility model relates to a kind of student's drawing rule, the specifically a kind of ruler that can make the circle line.

Background technology

Existing student use ruler with drawing, and can only do can straight line usefulness, can not make the circle line, makes the also handy compasses of bowlder at needs, trouble not only, but also the compasses of being with more.

The utility model content

In order to remedy the deficiency that the student can not make to justify line with ruler, the utility model provides a kind of ruler of making the circle function of taking, and this ruler not only can be made straight line usefulness, and can also make circumference usefulness, and a chi is dual-purpose.

The technical measures that its technical problem of the utility model solution is taked are that an aperture is made a call in the position of the center line zero graduation on plane on ruler, as centre point; Plane centreline is opened a straight trough on ruler; Process zigzag on the sideline of straight trough both sides; Spacing distance with between two tooth roots of row is 2 millimeters; On the odd bits of tooth root to object staff face groove of chi face groove the same side tooth, the tooth root of opposite side tooth is aimed on the even bit of size scale line dorsad, and adjustable distance is 1 millimeter when mapping like this.Design two toothrow shapes and mainly avoid a toothrow apart from too close, can not practical application.Design generally can conform to the required precision of student's mapping like this.During use, need, in the aperture of an insertion chi body centre point with two pencils; As centre point, and be fixed on the drawing paper, another pencil inserts to be drawn in the pairing tooth root of radius of circle; As scribe point, and on drawing paper, draw circumference around centre point, perhaps select a drawing pin or tack to insert the aperture of centre point near tooth root; One end of chi body is followed closely on the center of circle of drawing, and the reusable lead penholder is gone in the pairing tooth root of radius value, as scribe point; And be that centre point is made circumference on drawing paper around drawing pin, the circle that just can draw standard comes, thereby reaches the purpose that ruler can make to justify line.

The beneficial effect of the utility model is that ruler one chi that the student is used is dual-purpose, simple in structure.

Description of drawings

Be described further the utility model is bright below in conjunction with accompanying drawing.

Fig. 1 is a structural representation of taking the ruler of making the circle function.

Among Fig. 1,1, the chi body, 2, centre point, 3, straight trough, 4, zigzag.

The specific embodiment

In Fig. 1, an aperture is made a call in the position of the center line zero graduation on plane on the chi body 1, as centre point 2; Plane centreline is opened a straight trough 3 on ruler; Process zigzag 4 on the sideline of straight trough both sides; Spacing distance with between two tooth roots of row is 2 millimeters; On the odd bits of tooth root to object staff face groove of chi face groove the same side tooth, the tooth root of opposite side tooth is aimed on the even bit of size scale line dorsad, and adjustable distance is 1 millimeter when mapping like this.Being provided with of two row's apertures mainly avoid one when design row pitch-row too close, bad processing, but when line during radius value institute corresponding odd and even number point, is done the in the opposite direction of line.

Claims (2)

1. take the ruler of making the circle function, it is characterized in that: an aperture is made a call in the position of the center line zero graduation on plane on ruler, as centre point; Plane centreline is opened a straight trough on ruler; Process zigzag on the sideline of straight trough both sides; Spacing distance with between two tooth roots of row is 2 millimeters; On the odd bits of tooth root to object staff face groove of chi face groove the same side tooth, the tooth root of opposite side tooth is aimed on the even bit of size scale line dorsad.

2. the ruler of making the circle function of taking according to claim 1 is characterized in that: said ruler is with two pencils, in the aperture of an insertion chi body centre point; As centre point, and be fixed on the drawing paper, another pencil inserts to be drawn in the pairing tooth root of radius of circle value; As scribe point, and on drawing paper, draw circumference around centre point, perhaps select a drawing pin or tack to insert the aperture of centre point near tooth root; One end of chi body is followed closely on the center of circle of drawing; The reusable lead penholder is gone in the pairing tooth root of radius value, as scribe point, and is that centre point is made circumference on drawing paper around drawing pin.

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