CN201186562Y

CN201186562Y - Protractor

Info

Publication number: CN201186562Y
Application number: CNU2008200453815U
Authority: CN
Inventors: 时聪聪
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-03-25
Filing date: 2008-03-25
Publication date: 2009-01-28
Anticipated expiration: 2018-03-25

Abstract

The utility model discloses a protractor, which comprises a circular housing with a hollow structure and angle scales arranged on the edge of the housing; a slab penetrating the center of the housing and having two ends respectively arranged in the housing; and a pointer having one end fixed at the center of the slab in a rotary manner and the other end pointing to the scales on the edge of the housing. The direct measurement range of the protractor is extended from the original 180 DEG to 360 DEG to facilitate the use. The protractor solves the problem that the common protractor cannot accurately read the degree of an angle with shorter edges, and the pointer serving as the original shorter edge extends to accurately measure the degree of the angle. The protractor has the advantages of convenient disassembly and assembly, convenient use and good portability, and the middle part of the protractor and the midline on the pointer are designed to have a hollow structure, so that the protractor can be used for measuring and drawing angles.

Description

A kind of protractor

Technical field

The utility model relates to a kind of educational aid that takes measurement of an angle, especially a kind of multi-functional protractor.

Background technology

Protractor is a kind of angulation instrument commonly used, but in normal conditions, when measuring more bookish angles, because these angles are often drawn very for a short time, two limits at angle are also shorter, and the limit at angle can't be connected to the indicating graduation on the protractor, thereby also are difficult to read the accurate number of degrees at this angle; On the other hand, general protractor often can only be measured 180 degree with interior angle, can not directly read the number of degrees at the above angle of 180 degree; And general protractor all can't be drawn straight line, angle, so the student also need prepare ruler except preparing protractor, set square has increased the input of learning cost.

Summary of the invention

The purpose of this utility model is to provide a kind of multi-functional protractor, solves problems of the prior art.

For realizing above purpose, the utility model has been taked following technical scheme: a kind of protractor, include circular shell, and this housing is a hollow structure, described housing edge is provided with the angle index line; Pass the lath in this housing center of circle, these lath two ends are arranged at the housing inboard respectively; One end is fixed in the pointer of slat center point with rotation mode, and this pointer other end points to the graduation mark at housing edge.

Described lath is provided with graduation mark, in order to measure the length of line segment.

Described circular shell is to be made up of the two halves round casing, to form demountable structure.

One end of described arbitrary semicircle housing is provided with buckling end, and its second half relative round casing is provided with storage tank, and this buckling end is fastened in the storage tank.Adopt the feasible two halves round casing that both guaranteed of the form that fastens closely to fix dismounting easily again.

Described circular shell inboard is the slideway of circular groove formula, and described lath two ends are movably set in this slideway, can rotate around the center of circle of this circular shell.

The utility model possesses following advantage with respect to prior art: the semicircular structure of common protractor is improved to circular configuration, makes the direct measurement category of protractor expand 360 degree to by 180 original degree, made things convenient for use; Increased the pointer that can rotate around circle, thereby solved common protractor can't accurately be read the angle when the angle that some length of sides of measurement are lacked number of degrees problem, the effect of pointer is equivalent to original short limit is prolonged, and makes it just in time can measure the accurate number of degrees of angle; With 0 graduation mark is the boundary, and this protractor is conveniently detachable, has made things convenient for to use and carry; The centre and the center line on the pointer of protractor all are designed to hollow structure, make both energy angular of this protractor, can draw the angle again.

Description of drawings

Fig. 1 is the utility model angle gage structure schematic diagram;

Fig. 2 is the utility model protractor split structural representation;

Description of reference numerals: 1, housing, 11, slideway, 12, buckling end, 13, storage tank, 2, lath, 3, pointer.

The specific embodiment

Below in conjunction with the drawings and specific embodiments content of the present utility model is described in further details.

Embodiment one

See also shown in Figure 1ly, a kind of protractor includes circular shell 1, and this housing 1 is a hollow structure, and described housing 1 edge is provided with the angle index line; Pass the lath 2 in this housing 1 center of circle, these lath 2 two ends are arranged at housing 1 inboard respectively; One end is fixed in the pointer 3 of lath 2 mid points with rotation mode, and these pointer 3 other ends point to the graduation mark at housing 1 edge.

For ease of measuring the length of line segment, lath 2 is provided with graduation mark.

Easy to carry for making, circular shell 1 is divided into because the two halves round casing is formed, and each parts all with the housing flexible connection, make its assembly and disassembly all more convenient.

An end of stating arbitrary semicircle housing is provided with buckling end 12, and its second half relative round casing is provided with storage tank 13, and this buckling end 12 is fastened in the storage tank 13.Buckling end can be provided with a projection, and is provided with flanging on the projection top, and is provided with protruding tight muscle in the corresponding storage tank 13, and flanging can well overlap and be fixed in this protruding tight muscle place like this.

Circular shell 1 inboard is the slideway 11 of circular groove formula, and lath 2 two ends are movably set in this slideway 11, can rotate around the center of circle of this circular shell 1.If on lath, dispose pencil again, so just can draw circle.

Above-listed detailed description is at the specifying of the utility model possible embodiments, and this embodiment is not in order to limiting claim of the present utility model, does not allly break away from the equivalence that the utility model does and implements or change, all should be contained in the claim of this case.

Claims

1, a kind of protractor is characterized in that: include circular shell, this housing is a hollow structure, and described housing edge is provided with the angle index line; Pass the lath in this housing center of circle, these lath two ends are arranged at the housing inboard respectively; One end is fixed in the pointer of lath mid point with rotation mode, and this pointer other end points to the graduation mark at housing edge.

2, protractor according to claim 1 is characterized in that: described lath is provided with graduation mark.

3, protractor according to claim 1 is characterized in that: described circular shell is for to be made up of the two halves round casing, to form demountable structure.

4, protractor according to claim 3 is characterized in that: an end of described arbitrary semicircle housing is provided with buckling end, and its second half relative round casing is provided with storage tank, and this buckling end is fastened in the storage tank.

5, protractor according to claim 4 is characterized in that: described buckling end is the protruding end, and is provided with flanging on the top, protruding end, correspondingly is provided with protruding tight muscle in described storage tank.

6, according to arbitrary described protractor in the claim 1 to 5, it is characterized in that: described circular shell is inboard to be the slideway of circular groove formula, and described lath two ends are movably set in this slideway, can rotate around the center of circle of this circular shell.