CN200963988Y - Portable compasses - Google Patents

Abstract

Disclosed is a portable bow compass, which comprises a ruler, a fixed needle, a pencil lead and a moveable needle clamp. The utility model is characterized in that the ruler is provided with size calibrations and a sliding rail; the fixed needle is connected with one end of the ruler; the moveable needle clamp is connected on the sliding rail of the ruler; the moveable needle clamp is connected with the pencil lead. The utility model has the advantages that: (1), the radius can be directly read out by the ruler; (2), the circle drawing is convenient and time-saving, improving the work efficiency; (3) the stability of large circle drawing is greatly enhanced.

Description

The portable compasses

Technical field

The utility model relates to a kind of portable compasses.

Background technology

Compasses are drawing instruments that student, teacher use always, and the compasses that use can be divided into common compasses and drop bow etc. at present.These compasses are drawn bowlder and all must on paper or be measured earlier on the blackboard and be drawn radius of a circle, just can draw then and require the circle of radius.That is to say, draw the circle of a definite radius, different instrument must be arranged: ruler and compasses, bring inconvenience to people like this with compasses, particularly the teacher will draw one when definite radius is arranged at blackboard on class, need take the plenty of time.In addition, when drawing great circle, compasses fixedly stitch easily are shifted, and the circle of drafting is nonstandard.

Summary of the invention

The purpose of this utility model provides a kind of portable compasses, and it is without ruler, with the compasses circle with definite radius that just can draw.

The utility model is achieved like this, it comprises scale, locking pin, pencil-lead, active pointer folder, it is characterized in that being provided with on scale size scale and sliding rail, is connected and fixed pin at an end of scale, connect the active pointer folder on the sliding rail of scale, the active pointer folder connects pencil-lead.

The utility model has the advantages that: (1) radius can directly be read by scale; (2) it is convenient and time-saving to paint bowlder, increases work efficiency; Stability when (3) improving the drafting great circle greatly.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Active pointer folder 2, pencil-lead 3, scale 4, sliding rail 5, size scale 6, locking pin in the drawings 1,

The specific embodiment

As shown in Figure 1, the utility model comprises scale 3, locking pin 6, pencil-lead 2, active pointer folder 1, it is characterized in that on scale 3, being provided with size scale 5 and sliding rail 4, end at scale 3 is connected and fixed pin 6, connect active pointer folder 1 on the sliding rail 4 of scale 3, active pointer folder 1 connects pencil-lead 2.During use, people are as long as do the center of circle with locking pin, and according to the radius of circle size, mobile active pointer clips on the radius scale, carry out the picture circle.

Claims (1)

1, a kind of portable compasses, it comprises scale, locking pin, pencil-lead, active pointer folder, it is characterized in that being provided with on scale size scale and sliding rail, is connected and fixed pin at an end of scale, connect the active pointer folder on the sliding rail of scale, the active pointer folder connects pencil-lead.