CN2700828Y - Multipurpose protractor - Google Patents

Abstract

The utility model relates to a protractor, particularly a multipurpose protractor used in building trade. The utility model is characterized in that two rulers are movably connected, the two rulers are movably connected with crossed supporting bars, and one supporting bar is provided with the protractor. The utility model utilizes the principle of similar triangles with equal angles, so the angle measured is reflected on the protractor artfully. The utility model has the advantages of simple structure, easy use, and wide usage, and is suitable for the building projects.

Description

The multi-usage protractor

Technical field

The utility model relates to a kind of protractor, the multi-usage protractor that especially a kind of suitable building trade is used.

Background technology

Existing protractor kind is a lot, and wherein most of only being fit to imparts knowledge to students and draw and use, and they have the wideless shortcoming of function singleness, the scope of application, especially are not suitable for using in construction work.

Summary of the invention

Technical problem to be solved in the utility model is the defective that exists at existing product, and the multi-usage protractor that provides a kind of suitable building trade to use is to remedy the deficiency of existing product.

The technical solution of the utility model is achieved in that it comprises the ruler of two flexible connections, is connected with the support bar of intersection on two rulers, equipped amount hornwork on one of them support bar; Protractor is provided with groove, is provided with pointer in the groove; Pointer is fixed on the top of support bar.

The principle that the utility model utilizes the angle of similar triangles to equate is reflected in measured angle on the protractor cleverly, and it has advantage simple in structure, easy to use, broad-spectrum, is particularly suitable for using in construction work.

Description of drawings

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

Fig. 2 is another user mode figure of the present utility model

Concrete real mode

Below in conjunction with accompanying drawing the utility model is further described:

As shown in Figure 1, the utility model comprises the support bar 3 and 4 that is connected with intersection on the ruler 1 of two flexible connections and 2, two rulers 1 and 2 by screw, equipped amount hornwork 5 on one of them support bar 3; Protractor 5 is provided with groove 6, is provided with pointer 7 in the groove 6; Pointer 7 is fixed on the top of support bar 3.

During use, ruler 1 and 2 is adjacent to the both sides of the measured angular of wanting,, so can clearly shows measured angle on the protractor 5 because angle α equates with angle β.As shown in Figure 2, in the time will measuring the exterior angle, only need support bar 3 and 4 is attached to respectively on ruler 2 and 1, ruler 1 and 2 is blocked the both sides that will measure the exterior angle get final product, very easy to use.

Claims (3)

1, a kind of multi-usage protractor, it is characterized in that: it comprises the ruler of two flexible connections, is connected with the support bar of intersection on two rulers, equipped amount hornwork on one of them support bar.

2, according to a kind of multi-usage protractor of claim 1, it is characterized in that: protractor is provided with groove, is provided with pointer in the groove.

3, according to a kind of multi-usage protractor of claim 1, it is characterized in that: pointer is fixed on the top of support bar.

Images