CN201099103Y

CN201099103Y - Pointer type protractor

Info

Publication number: CN201099103Y
Application number: CNU2007200944511U
Authority: CN
Inventors: 白玉霞
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-10-12
Filing date: 2007-10-12
Publication date: 2008-08-13
Anticipated expiration: 2017-10-12

Abstract

A pointer-type angle gauge is provided, which relates to the field of study and teaching appliances. The angle gauge is characterized in that a positioning pin is provided at the central point of a main body of the angle gauge, and a pointer is movably connected around the positioning pin as an axis. The positioning pin is provided at the central point of the main body of the angle gauge, so that the central point is fixed when measuring an angle, thereby ensuring accurate measurement. The pointer is movably connected around the positioning pin as an axis, so that the angle gauge can measure an angle with short edges without lengthening the two edges of the angle. The measured angle is easily obtained by reading the scale at the outer circle, to which the pointer points. The pointer-type angle gauge has simple structure and is easy to use.

Description

The pointer-type protractor

Technical field:

The utility model relates to a kind of protractor of measuring angle and picture angle.

Background technology:

Protractor is student's the schooling apparatus and the teaching aid of teacher's indispensability, and its main application is the tolerance angle and draws the angle.

At present, its weak point of protractor commonly used has 2 points, and the one, it is thick excessively that central point has, and what have is meticulous, and the central point that also has is the aperture of about 1 millimeter.When the tolerance angle, at first be that the central point of protractor is alignd with the summit at the angle that will measure.Central point is crossed slightly can cause measurement error; When central point is meticulous, one side rotation amount hornwork zero graduation line with tolerance the angle the process that overlaps in be easy to the position of Mobility Center point, thereby also can cause measurement error; When central point is 1 millimeter a aperture, though it is very convenient to draw the angle, increased measurement error simultaneously, the beginner is difficult to be alignd with the summit of measuring the angle in the center of circle of aperture.The 2nd, scale and graduation mark are imperfect.Existing protractor is divided into inner ring scale and outer ring scale, and the scale of outer ring is very accurate also data, but inner ring scale free of data, and be that five degree are unit lattice.In tolerance during the angle, when too short, use the inner ring scale of free of data can cause very mistake as the both sides at angle.If the both sides at angle are prolonged use outer ring scale, because the thickness of pen and user's factors such as the technique of painting also can cause very mistake.

Summary of the invention:

Technical problem to be solved in the utility model is the error that the tolerance angle exists, thereby a kind of simple in structure, easy to use, pointer accurately protractor of tolerance is provided, to overcome the deficiency that prior art exists.

The technical solution of the utility model is: the central spot at the protractor body is provided with a pilot pin, is that axle flexibly connects a pointer with the pilot pin.

For preventing pointer damage and easy to use, transparent plastic sheet identical of connection on the protractor body with the protractor body size, have the arcuate socket consistent with its arc on the transparent plastic sheet, pointer is provided with an indicator knob that stretches out the arcuate socket on the transparent plastic sheet.

The utility model is provided with a pilot pin in the central spot of protractor body, and center position is fixed during the tolerance angle, and tolerance accurately; Is that axle flexibly connects a pointer with the pilot pin, therefore, during very short angle, need not prolongs two limits at angle, utilize pointer outer ring scale pointed can accurately read the scale value at angle on two limits of tolerance, simple in structure, easy to use.

Description of drawings:

Accompanying drawing is a structure cutaway view of the present utility model.

The specific embodiment:

With reference to accompanying drawing, the utility model is that the central spot at protractor body 1 is provided with a pilot pin 2, with pilot pin 2 serves as that axle flexibly connects a pointer 3, on protractor body 1 by pilot pin 2 connect one with protractor body 1 big or small identical transparent plastic sheet 5, have the arcuate socket consistent with its arc 6 on the transparent plastic sheet 5, pointer 3 is provided with an indicator knob 4 that stretches out the arcuate socket 6 on the transparent plastic sheet 5.

During use, the protractor central point is fixed in the summit at measured angle, overlaps with the another side at angle by the indicator knob rotary indicator then, can measure the angle accurately by pilot pin.

Claims

1, a kind of pointer protractor is characterized in that: the central spot at protractor body (1) is provided with a pilot pin (2), serves as that axle flexibly connects a pointer (3) with pilot pin (2).

2, pointer protractor according to claim 1, it is characterized in that: one of connection and the identical transparent plastic sheet (5) of protractor body (1) size on protractor body (1), have the arcuate socket consistent with its arc (6) on the transparent plastic sheet (5), pointer (3) is provided with an indicator knob (4) that stretches out the arcuate socket (6) on the transparent plastic sheet (5).