CN201143849Y - Straight ruler capable of drawing circles - Google Patents

Abstract

A ruler capable of drawing a circle belongs to the field of drawing instruments; a short pin is arranged below the zero calibration of the scale ruler as the circle center leg of a pair of compasses; a U-shaped splint which can slide is arranged on the same side of the short pin as the drawing leg of the compasses; the drawing leg is provided with a protuberant circular-groove-shaped pencil case for drawing instruments, such as a pencil to be inserted in, and the circle can be drawn; the utility model is provided with the functions of a ruler and compasses, so that the circle drawing is more accurate and convenient.

Description

A kind ofly draw round ruler

One, technical field

The utility model relates to drawing appliance, will set up two compass foots on the scale ruler and is used for drawing, particularly the shape and structure of its compass foot.

Two, background technology

For a long time, student and engineering drawing all use compasses to draw, and determine that its radius length will use the scale ruler, and the two must cooperate, and is indispensable, uses inconvenience, and error often appears in circular diameter.

Three, summary of the invention

The utility model is that ruler and compasses are united two into one, and not only can make ruler but also can draw circle.

1, technical scheme

The center of circle pin that replaces compasses at ruler scale 0 place's hour hand of downside peace, press from both sides slidably U-shaped clamping plate at its homonymy, establish the circular groove shape pen cap of projection on the clamping plate, can insert drawing tools such as pencil, ball pen, establish holding screw above the pen cap, can fix drawn radius of a circle and paintbrush, replace the picture pin of compasses with this.With center of circle pin is the center of circle, rotates one week of ruler, and the picture pin promptly draws round next, does not draw bowlder, can take off paintbrush.

2, beneficial effect

Compasses and ruler function are merged and minimizing apparatus amount, make the radius of a circle that draws more accurate.

Four, description of drawings

Fig. 1 is a kind of round ruler sketch of drawing

Among the figure: ruler 1 center of circle pin 2 U-shaped clamping plate 3 paintbrushes 4 a solid screw 5 pens cap 6

Five, the specific embodiment

Get one thick 3 millimeters scale ruler, aim at the center, below of 0 scale and bore dark 10 millimeters apertures, one section with 20 millimeters long has the draw point tail of needle point to penetrate in the hole, use A, B is gluing to reinforce as center of circle pin 2, adopt thick 1 millimeter thick iron plate, process the side and be 20 * 4 * 20 millimeters U-shaped clamping plate 3, its flat long 20 millimeters, lower plane, projection radius in center is that 5 millimeters circular groove is as the pen cap 6 above, the aperture of line in the band is bored in the center on the pen cap 6, the hold-doun nut that has of joining a same outer line of band, long 5 millimeters primary screw conduct is a screw 5 admittedly, pencil 4 is fined away insert the pen cap 6, slide into required radius length, fastening screw of lemon 5 can the picture circle.

Claims (3)

1, a kind ofly draw round ruler, main structure is a scale ruler, it is characterized in that below ruler with the center of circle pin picture pin.

2, a kind of round ruler of drawing according to claim 1, the pin side that it is characterized in that drawing is a U-shaped, is sandwiched in the ruler below, can be in the ruler slid underneath.

3, a kind of round ruler of drawing according to claim 1, the bossed circular groove shape pen cap on the pin that it is characterized in that drawing has a solid screw on it.

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