CN2693489Y

CN2693489Y - Multipurpose compasses with ruler

Info

Publication number: CN2693489Y
Application number: CN 200420051041
Authority: CN
Inventors: 沈灵奕
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-04-17
Filing date: 2004-04-17
Publication date: 2005-04-20
Anticipated expiration: 2014-04-17

Abstract

The utility model relates to a multi-purpose compass with a ruler which adopts plastic as raw material and is different from the structure of a traditional compass. The utility model is widely suitable for a teacher to teach, a student to study and various official places. The utility model changes the structure of drawing a circle with two legs of the traditional compass, only needs material with the volume less than one leg whereof to be formed into an I-shaped girder, and the compass with novel structure, easy use and accurate dimension can be produced by additionally attaching a small amount of accessories. The utility model is characterized in that the I-shaped girder which is provided with a scaleplate is provided with a slide bar which can be used to adjust the size of the radius of a circle manually, the slide bar is provided with a center fixing handle and a circle center fixer which are used for fixing the circle center, and one end of the I-shaped girder is provided with a chalk fixer. The utility model is an ideal drawing tool for school teaching, student studying and various official places. Compared with the traditional compass, the material of the utility model is reduced by more than a half, thus the production cost is reduced. Therefore, the utility model has obvious market competitive power.

Description

The Napier's compasses of band scale

Technical field

The utility model is that a kind of employing plastics are material, with the distinct a kind of Napier's compasses with scale of traditional compasses structure.It is widely used in the application of teachers ' teaching, student's study and various office spaces.Be teachers ' teaching, student's study and the desirable drawing instrument in various office space.It changes the structure that two legs of traditional compasses are made circle, and is more over half than traditional compasses materials minimizing, therefore, the material cost of compasses is significantly reduced, thereby has the tangible market competitiveness.

Background technology

Traditional compasses have two big classes, and a class is the wooden compasses that teachers ' teaching is used, and its volume is bigger, and it is not too convenient to use, and particularly the student appears on the stage when doing the demonstration topic on blackboard.Because the student did not use wooden compasses basically, added that the iron pin needlepoint form that is used on the wooden compasses use as the center of circle resembles iron nail head, very stiff and demanding when contacting with blackboard, be difficult to home position is fixed.So, seldom make decent circular pattern.And the common compasses that the another kind of student of being uses are used on the compasses that the iron aciculiform shape used as the center of circle is very thin, needle point is very sharp, are easy to paper is transfixed; Even the paper that can will map is badly damaged.If the student does not take care, be used to the iron pin needle point used as the center of circle on the compasses, probably stab the tender little hand of student children; moreover; wooden compasses need consume a large amount of timber, and felling timber impairs the greening construction and destroys the ecological balance, is unfavorable for the protection of the Nature.

Summary of the invention

The purpose of this utility model is, a kind of deficiency that overcomes above-mentioned two big class compasses is provided, and possesses the scale of carrying simultaneously, and it both can be used as ruler and has used when making straight line; Again can be to the direct value of the radius of circle done size, the size of the circle of being done with decision; Make a kind of Napier's compasses that the easy to operate circle of only being done of circle is difficult for walking (change) shape again with scale.

The utlity model has four big advantages.The one, on blackboard (or paper), make bowlder, because of left hand directly hold centering handle after, the center of circle firmly is fixed on the blackboard (or paper), and and the center of circle fixator of slide bar one and a word beam between can rotate flexibly, it is parallel each other with the plane that needs to do circle to rotate formed disk.So, there is not external force to influence the location in the center of circle, the center of circle is not fixedly positioning move.This has just laid firm foundations for making real circular pattern.Two is to be printed on scale size marking line and corresponding scale dimension figure on the word beam, makes the radius of a circle size that bowlder can directly be set needs works, saved need other mark and take measurements after could determine need work uses such as radius of a circle size inconvenient.The 3rd, to mould Dai Mu, replace timber fully with plastics, eradicated wooden educational compasses and need consume a large amount of timber, and felling timber impairs the greening construction and destroys the ecological balance, is unfavorable for the protection of the Nature.The 4th, compare use with traditional common compasses quite safe.Traditional common compasses all have is making the needle point of bowlder as the center of circle.When particularly students in middle and primary schools use common compasses,, be easy to stab the tender little hand of student children, even bring unnecessary accident as not taking care.

The utility model is highly suitable for the application of all kinds of school instructions, student's study and various office spaces, is the desirable drawing instrument in above-mentioned place.

Description of drawings

Accompanying drawing is a structural representation of the present utility model.

The specific embodiment

At first on (2) on the word beam of existing gathering sill, stamp scale size marking line (7) and corresponding scale size numerical value, the handle (3) of will feeling relieved be installed in slide bar (4) above, again center of circle fixator (5) is installed in slide bar (4) below, and then the end that the slide bar (4) that centering handle (3) and center of circle fixator (5) will be installed guide slot from the word beam is opened loads onto, and at last chalk fixator (1) is installed in the end that guide slot is opened on the word beam.

The utility model can select to determine the diameter and the length of a word beam according to using needs when producing, its style can be made the wooden compasses that teachers ' teaching is used, and is used for mapping on blackboard; Also can make the common compasses of student's study or office usefulness, be used on paper, mapping.It makes used material can be plastics or metal or other nonmetallic materials.The utility model materials province, less investment, instant effect can be accomplished devoid of risk.

Claims

1, a kind of Napier's compasses with scale, form by Yi Ziliang (2), chalk fixator (1), centering handle (3), slide bar (4), center of circle fixator (5), directed piece (6), scale size marking line (7) etc., it is characterized in that having guide slot on the Yi Ziliang (2), the guide slot openend of one word beam (2) is equipped with chalk fixator (1), be with slide bar (4) on the one word beam, slide bar (4) is equipped with centering handle (3) and center of circle fixator (5) up and down respectively; Directed piece (6) also is housed in addition.

2, according to the Napier's compasses of the band scale of claim 1, it is characterized in that the cross section vertical with the axle center of a word beam (2) can be triangle, trapezoidal, cabinet shape, square, limit shape, circle, ellipse, flute profile arbitrarily, and by the shape that combines of above shape, the slide bar that matches with it (4) inner chamber should be to match with above-mentioned shape and slidable shape on Yi Ziliang (2), the length of one word beam (2) should be selected between 50 to 5000 millimeters according to the practical use needs.

3, according to the Napier's compasses of the band scale of claim 1, flat of the rubber sucker of (or the other) shape that it is characterized in that a bowl is arranged on the center of circle fixator (5) or rubber.

4, according to the Napier's compasses of the band scale of claim 1, it is characterized in that having guide slot on the Yi Ziliang (2), guide slot one end is opened other end sealing, and guide slot seals the sealing size of an end and should select between 1 to 50 millimeter, and groove is embedded in the directed piece (6) that is fixed on the slide bar (4).Directed piece (6) is the slide block that screw, nut or other and guide slot match.

5,, it is characterized in that the material of Yi Ziliang (2), chalk fixator (1), centering handle (3), slide bar (4), center of circle fixator (5), directed piece (6) is plastics or other nonmetallic materials or metal material according to the Napier's compasses of the band scale of claim 1.

6,, it is characterized in that chalk fixator (1) can make corresponding pencil, pen, ballpoint pen fixator according to actual needs according to the Napier's compasses of the band scale of claim 1.