CN204820796U

CN204820796U - Modular compasses

Info

Publication number: CN204820796U
Application number: CN201520532690.5U
Authority: CN
Inventors: 万云茸
Original assignee: Shanghai Gezhi High School
Current assignee: Shanghai Gezhi High School
Priority date: 2015-07-21
Filing date: 2015-07-21
Publication date: 2015-12-02
Anticipated expiration: 2025-07-21

Abstract

The utility model relates to a stationery field especially relates to a modular compasses, including compasses cap, pivot, access arm, drawing arm, still include: scale and calibrated scale, wherein the scale is located the access arm, and the scale initiating terminal of scale is fixed on the end of access arm below to the diameter of circle is measured to rotatory scale to horizontal position, the calibrated scale is located pivot, scale initiating terminal and access arm coincidence. Desk after the improvement uses convenient and fast.

Description

A kind of Combined compasses

Technical field

The utility model relates to a kind of stationery, particularly relates to the improvement to a kind of Combined compasses structure.

Background technology

The compasses used at present are by given radius distance value, and auxiliary extra chi determines that the amplitude of opening of compasses two-arm draws circle, can be with and serve inconvenience, when surrounding does not have chi, use very inconvenient with such compasses construction.

Utility model content

In order to solve the problem, the utility model devises one can determine radius of a circle without the need to other chi, is easy to use quick.

To achieve these goals, the utility model devises a kind of Combined compasses, comprises compasses cap, rotating shaft, registration arm, plotting hand, it is characterized in that, also comprise:

Rule, is positioned in described registration arm, and the scale initiating terminal of described rule is fixed on described registration arm lower ends, measures diameter of a circle with rotating scale chi to horizontal level;

Dial, be positioned in described rotating shaft, scale initiating terminal overlaps with described registration arm.

Preferably, the tow sides of described rule are equipped with scale.

Preferably, the long length being less than registration arm of the chi of described rule.

Preferably, the scale of described rule is accurate to centimetre.

Preferably, the scale of described dial is accurate to integer angle.

Preferably, the maximum of described dial scale is identical with the maximum opening angle of plotting hand.

Compared with prior art, the beneficial effects of the utility model are:

1, when given need the radius of a circle of picture time, only the chi in registration arm need be rotated to horizontal level, can radius of a circle be determined, easy to use;

If 2 given radius of a circle or diameters, by performing mathematical calculations by the length of known radius and registration arm, subscale mark dish, can determine the amplitude that plotting hand opens.

Accompanying drawing explanation

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

Fig. 2 is use schematic diagram of the present utility model.

1-compasses cap; 2-rotating shaft; 3-registration arm; 4-plotting hand; 5-rule; 6-dial.

Detailed description of the invention

As shown in accompanying drawing 1, accompanying drawing 2, a kind of Combined compasses, comprise compasses cap 1, rotating shaft 2, registration arm 3, plotting hand 4, also comprise: rule 5 and dial 6, wherein rule 5 is positioned in registration arm 3, the scale initiating terminal of rule 5 is fixed on registration arm 3 lower ends, measures diameter of a circle with rotating scale chi 5 to horizontal level; Dial 5 is positioned in rotating shaft 2, and scale initiating terminal overlaps with registration arm 3.

The tow sides of rule 5 are equipped with scale; The long length being less than registration arm 3 of chi of rule 5; The scale of rule 5 is accurate to centimetre; The scale of dial 6 is accurate to integer angle; The maximum of dial 6 scale is identical with the maximum opening angle of plotting hand 4.

When given need the radius of a circle of picture time, only the chi in registration arm 3 need be rotated to horizontal level, can radius of a circle be determined, easy to use; If given radius of a circle or diameter, by performing mathematical calculations by the length of known radius and registration arm 3, subscale mark dish, can determine the amplitude that plotting hand 4 opens.

By illustrating and accompanying drawing, giving the exemplary embodiments of the ad hoc structure of detailed description of the invention, based on the utility model spirit, also can do other conversion.Although above-mentioned utility model proposes existing preferred embodiment, but these contents are not as limitation.

For a person skilled in the art, after reading above-mentioned explanation, various changes and modifications undoubtedly will be apparent.Therefore, appending claims should regard the whole change and correction of containing true intention of the present utility model and scope as.In Claims scope, the scope of any and all equivalences and content, all should think and still belong in intention of the present utility model and scope.

Claims

1. a Combined compasses, comprises compasses cap, rotating shaft, registration arm, plotting hand, it is characterized in that, also comprise:

2. a kind of Combined compasses according to claim 1, is characterized in that, the tow sides of described rule are equipped with scale.

3. a kind of Combined compasses according to claim 1 and 2, is characterized in that, the long length being less than registration arm of chi of described rule.

4. a kind of Combined compasses according to claim 1 and 2, is characterized in that, the scale of described rule is accurate to centimetre.

5. a kind of Combined compasses according to claim 1, is characterized in that, the scale of described dial is accurate to integer angle.

6. a kind of Combined compasses according to claim 1 or 5, it is characterized in that, the maximum of described dial scale is identical with the maximum opening angle of plotting hand.