CN103575173A

CN103575173A - 180-degree vernier protractor

Info

Publication number: CN103575173A
Application number: CN201310601125.5A
Authority: CN
Inventors: 郭永然
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-11-25
Filing date: 2013-11-25
Publication date: 2014-02-12

Abstract

The invention relates to a measuring tool capable of measuring angle and radian accurately. The measurement range of the vernier protractor is from 0 to 180 degrees; the measuring precision of the vernier protractor can reach minute; a pointer is provided for allowing a user to read conveniently. The vernier protractor comprises two parts, namely a dial plate and an alidade, wherein the dial plate can measure 239 degrees, the alidade can measure 59 degrees, and 60 scales are formed in the alidade; a pointer a is fixed at the 0-scale position on the alidade; the length of the pointer a is larger than the radius of the dial plate; the scale pointed by the pointer a on the dial plate is the angle degree of the measured angle; a pointer b is fixed at a rotating shaft; the length of the pointer b is also larger than the radius of the dial plate; the pointer b can be rotated within the vernier range; the scale pointed by the pointer b on the dial plate is minute of the measured angle; when the vernier and the dial plate are folded at the 0-scale position, the pointer a, the 0-degree on the dial plate and the 0-degree on the vernier are on the same straight line. The measuring tool can accurately and quickly measure angles, is simple in the whole structure, low in the manufacturing cost, easy to operate, and suitable for being used in aspects of study and the like.

Description

180 degree vernier protractors

Affiliated technical field

The present invention relates to a kind of accurately taking measurement of an angle and the survey instrument of radian.Especially can in 0-180 degree, accurately and fast measurement of angle be arrived to " dividing " this position.

Background technology

At present, by a kind of protractor, by 180 scale scales and alidade two parts, formed.It is fan-shaped that alidade becomes, and the center of circle of alidade overlaps with the center of circle of angulation dial, and a thin axle is fixed both through the center of circle, and alidade is pasting the plane of angulation dial and rotating around stationary shaft, utilizes the principle of work of vernier, can survey and read " dividing " this position.But this survey instrument cannot be accurate to all angles in 0-180 degree the measurement of " dividing ", and especially easily misunderstand or misread when reading " dividing " operation.

Summary of the invention

In order to overcome above-mentioned protractor, cannot the random angle in 180 degree accurately be measured the deficiency that " dividing ", reading are easily made mistakes, the invention provides a kind of protractor, this protractor can not only measure to the random angle in 180 degree " dividing ", and user can carry out reading to " angle " and " dividing " respectively quickly and easily by pointer.

The technical solution adopted for the present invention to solve the technical problems is: by the angulation dial of one 239 degree and one 59 degree, be split alidade two parts of 60 parts and form, a root pointer a is fixed in alidade 0 scale position, pointer a length is greater than dial radius, when alidade and dial are when 0 scale closes up, on pointer a, dial on 0 scale, alidade 0 scale all on same straight line.Rotating shaft position is flexibly connected a root pointer b.Left and right sides on alidade arranges respectively an obstacle, and limit pointer b is only at alidade internal rotating.Angulation dial is inner free fan-shaped.

The invention has the beneficial effects as follows, can accurately measure the angle in 0-180 degree, and be accurate to " dividing ".There are two root pointers to indicate respectively " angle " and " dividing ", facilitate user's Rapid reading.User can be fan-shaped by the sky of protractor inside, with finger, stirs alidade.Take measurement of an angle accurately and fast, one-piece construction is simple, cheap for manufacturing cost.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the present invention is further described.

Fig. 1 is the figure that the present invention measures middle certain angle of 0-180 degree.

Fig. 2 is that protractor of the present invention is measured 0 figure while spending.

Fig. 3 is that protractor of the present invention is measured 180 figure while spending.

1. dials in figure, 2. alidade, 3. pointer a, 4. pointer b, 5. empty fan-shaped 6. rotating shafts.

Embodiment

In Fig. 1, institute's angle measurement summit is overlapped with the protractor center of circle, dial (1), on one side upper 0 degree overlaps with institute angle measurement, is stirred the pointer a(3 on alidade (2)), or stir alidade (2) by sky fan-shaped (5).Make alidade (2) and pointer b(4) (6) rotation around the shaft, until pointer a(3) overlap with another limit of institute angle measurement.User fixes alidade (2), then rotates the pointer b(4 on alidade (2)), until pointer b(4) on upper certain scale of the dial (1) of indication and alidade certain scale on same straight line.Then read the registration on the dial (1) of pointer a (3) indication, the reading at " angle " surveyed, read now pointer b(4) registration of indication on alidade (2), the reading of " dividing " of surveying, the angle of then " angle " and " dividing " being added up and being surveyed.

In Fig. 2, be the original state of measuring, to take measurement of an angle be 0 to protractor.Now, pointer (3) and pointer (4) close up, and 59 on upper the 60th lattice of alidade (2) and dial spent on same straight line.

In Fig. 3, be the state while measuring maximum angle, i.e. institute's angle measurement is 180 degree.Pointer a(3) overlap with the degree of 180 on dial (1) scale mark, upper the 60th lattice of alidade (2) overlap with the degree of 239 on dial (1) line.

Claims

1. a degree vernier protractor is comprised of dial and alidade two parts, it is characterized in that: dial is 239 degree, and alidade is 59 degree, and in alidade, 59 degree are divided into 60 parts.

2. 180 degree vernier protractors according to claim 1, is characterized in that: a root pointer a is fixed in alidade 0 degree position, and pointer a length is greater than dial radius, and on dial, the registration of indication is " angle ".

3. 180 degree vernier protractors according to claim 1, is characterized in that: in rotating shaft place, be flexibly connected a root pointer b, this pointer b length is greater than dial radius, and pointer b can rotate in alidade, and on alidade, the registration of indication is " dividing ".

4. 180 degree vernier protractors according to claim 1 and 2, is characterized in that: when alidade and dial close up at 0 scale mark place, be fixed on pointer a on alidade, dial on 0 scale, vernier 0 scale on same straight line.

According to claim 1 180 degree vernier protractors, it is characterized in that: on dial, had fan-shaped, the fan-shaped dial inside that is positioned at, fan-shaped angle is 239 degree, inside radius is greater than 0, external radius is less than alidade radius.

6. 180 degree vernier protractors according to claim 1, is characterized in that: the left and right sides on alidade arranges respectively an obstacle.