CN2513785Y

CN2513785Y - Multifunctional compasses for drawing circle without needle hole

Info

Publication number: CN2513785Y
Application number: CN 01252679
Authority: CN
Inventors: 刘秀萍; 刘合猛
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-12-03
Filing date: 2001-12-03
Publication date: 2002-10-02
Anticipated expiration: 2011-12-03

Abstract

The utility model is a tracer. A multi-functional bow compass with a hidden center comprises a base and a disk. The utility model is characterized in that the base is a circular ring, in which the disk is arranged. The surface of the base is scored with the graduation mark of 360 degrees. The inner side of the base is provided with a circular groove for the disk to be embedded and slide. The disk is provided with a poking hole, a line drawing long hole and an arc drawing hole and the both sides of the line drawing long hole are marked with the graduation mark of metric system. The number of the arc drawing holes is at least 20 and the distance of each arc drawing hole to the center of the disk varies. The utility model has the beneficial effects of multiple functions, convenient use and carrying and no needle hole left at the center.

Description

Multi-functional latent heart compasses

(1) technical field: the utility model is a kind of drawing instrument.

(3) background technology: drawing instrument has compasses, protractor, set square, ruler etc. at present, these instruments will be selected to be used during drawing, and process is loaded down with trivial details, and draws bowlder, and circle centre position will stay disagreeable pin hole.

(3) summary of the invention: the purpose of this utility model provides a kind of multi-functional latent heart compasses, and its draws bowlder circle centre position let the acupuncture needle remain at a certain point the hole, and it integrates the function of compasses, protractor, set square and ruler, portably uses conveniently.

The technical solution of the utility model is: multi-functional latent heart compasses are made of base and disk, and it is characterized in that: base is annular, and disk is arranged in base; The susceptor surface portrayal has 360 ° reticule, and the base inboard has the toroidal cavity that embeds and slide for disk; Have dial hole, setting-out slotted hole on the disk and draw the arc hole, setting-out slotted hole both sides indicate metric system graduation mark, draw the arc hole and have 20 at least, and each distance of drawing arc pitch-row disc centre is different.

The beneficial effects of the utility model are: integrate the function of compasses, protractor, set square and ruler, portably use conveniently, and draw bowlder, circle centre position let the acupuncture needle remain at a certain point hole.

(4) description of drawings: Fig. 1 is a structural representation of the present utility model.

Among the figure, the 1-base, the 2-disk, the 3-dial hole, 4-setting-out slotted hole, 5-draws the arc hole.

(5) specific embodiment: referring to Fig. 1, this is the drawing instrument that a kind of primary and secondary students of being suitable for use, and makes of transparent lucite, the external diameter φ 100mm of base [1], the external diameter φ 80mm of disk [2], dial hole [3] diameter phi 15mm, the wide 3mm of the long 60mm of setting-out slotted hole [4], draw arc hole [5] diameter phi 3mm, the summary using method is drawn circle and arc: home position and disc centre are aligned, nib is stretched in the corresponding picture arc hole now, buttress base, mobile nib rotates with disk and forms; Draw the angle: nib is stretched into the setting-out slotted hole, and to draw a straight line be true edge, and finger pushing hole is rotated disk needs angle, draws a straight line again and just becomes.

Claims

1. multi-functional latent heart compasses are made of base [1] and disk [2], and it is characterized in that: base [1] is annular, and disk is arranged in base; The susceptor surface portrayal has 360 ° reticule, and the base inboard has the toroidal cavity that embeds and slide for disk; Have dial hole [3], setting-out slotted hole [4] on the disk [2] and draw arc hole [5], setting-out slotted hole both sides indicate metric system graduation mark, draw the arc hole and have 20 at least, and each distance of drawing arc pitch-row disc centre is different.