CN201148077Y

CN201148077Y - Big compasses

Info

Publication number: CN201148077Y
Application number: CNU2007200777203U
Authority: CN
Inventors: 宋匀; 李莉
Original assignee: Shanghai Jingan Area No 1 Primary School
Current assignee: Shanghai Jingan Area No 1 Primary School
Priority date: 2007-12-29
Filing date: 2007-12-29
Publication date: 2008-11-12
Anticipated expiration: 2017-12-29

Abstract

The utility model discloses a big bow compass comprising a curve ruler, a pencil, a sucking disc and a fixed needle group; the curve ruler comprises a ruler tape, a handle, a curve-ruler shaft and a ruler-tape lock; the utility model is characterized in that a pencil is fixed on the end of the ruler tape. The handle is arranged on one end of the curve-ruler shaft and the sucking disc is fixed on the other end. The ruler-tape lock that fixes the ruler tape and the extension elongation is arranged on the handle. A short and sharp fixing needle is arranged at the middle of the sucking disc.

Description

Big compasses

Technical field

The utility model relates to a kind of drawing tools, is specially a kind of compasses.

Background technology

It is limited that existing compasses are drawn diameter of a circle.Be subjected to the compasses volume restrictions, generally draw diameter of a circle in one meter.Therefore when needing the great circle of a standard of picture, some engineering project constructions can not find suitable circle tool.

The utility model content

The purpose of this utility model is to provide a kind of big compasses of suitable picture standard great circle.

The problem that the utility model solved can realize by the following technical solutions: big compasses are mainly by tape measure, pen, sucker, locking pin group, tape measure has chi band, handle, tape measure axle, chi with lock, it is characterized in that described chi end of tape is fixed with the pen of the vestige that is used for drawing.

Described tape measure axle, a positive end is fixed with handle, and reverse side one end is fixed with sucker.

There is the chi of fixed ruler band extension elongation with lock on the described handle.

The center fixation of described sucker has short and small and sharp-pointed locking pin.

Using method of the present utility model is: pull out chi and take appropriate length to, it is with lock to lock chi, fixes the chi strip length.Find the center of circle, with the centrally aligned center of circle of sucker.If home position is smooth,, sucker is held get final product as long as press sucker gently.To firmly locking pin be inserted if home position is coarse, and pin handle with hand and fix.The chi band stretching pen is pressed on the face that needs picture circle to rotate around the center of the sucker that fixes get final product.

Beneficial effect, the utility model is simple in structure, and is easy to implement, as long as original tape measure is done to transform slightly.The very large diameter circle of the standard of can drawing has very easily solved and has drawn the problem that great circle does not have specialist tools in the engineering project.

Description of drawings

Fig. 1 is a Facad structure schematic diagram of the present utility model;

Fig. 2 is a structure schematic diagram of the present utility model.

The specific embodiment

For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.

See figures.1.and.2, big compasses are mainly by 4 groups of tape measures 1, pen 2, sucker 3, locking pin, and tape measure 1 has chi band 6, handle 5, tape measure axle 7, chi with lock 8, it is characterized in that described chi band 6 ends are fixed with the pen 2 of the vestige that is used for drawing.

Described tape measure axle 7, an end is fixed with handle 5 in the front of tape measure 1, is fixed with sucker 3 at reverse side one end of tape measure 1.

The chi with lock 8 that fixed ruler band 6 extension elongations are arranged on the described handle 5.

The center fixation of described sucker 3 has short and small and sharp-pointed locking pin 4.

More than show and described basic principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims

1, big compasses are mainly by tape measure, pen, sucker, locking pin group, and tape measure has chi band, handle, tape measure axle, chi with lock, it is characterized in that described chi end of tape is fixed with the pen of the vestige that is used for drawing; Described tape measure axle, a positive end is fixed with handle, and reverse side one end is fixed with sucker; There is the chi of fixed ruler band extension elongation with lock on the described handle; The center fixation of described sucker has short and small and sharp-pointed locking pin.