CN202144164U - Straight ruler capable of measuring diameter - Google Patents

Abstract

The utility model relates to drawing apparatuses or teaching aids of stationery, in particular to a straight ruler capable of measuring diameter, which mainly comprises a main ruler, a secondary ruler and a sliding block, wherein a longitudinal slot is arranged in the middle of the main ruler, the bottom surface of the middle of the longitudinal slot is provided with a steering round hole, the sliding block and the middle of the secondary ruler are connected into a whole, the sliding block can slide along the longitudinal slot, and the sliding block can steer at the position of the steering round hole. The straight ruler capable of measuring the diameter is reasonable in design, is easy to realize, not only can draw straight lines and vertical lines, but also can measure the diameter, and is simple in structure and convenient for use.

Description

ruler to measure diameter

technical field

The utility model relates to a drawing instrument or teaching aid for stationery, in particular to a diameter-measuring straightedge capable of drawing straight lines and vertical lines and measuring diameters with a simple and practical structure.

Background technique

As we all know, the current stationery on the market has a single purpose, especially when students measure the diameter of a circle with a ruler or a set square, they need to first draw the diameter line by drawing, and then measure it with a ruler, which is inefficient. A ruler that measures diameter can solve this problem.

Contents of the invention

In order to solve the above problems, the utility model provides a straightedge that can measure the diameter, which can not only draw a straight line, but also measure the diameter. An effective teaching aid is provided.

The scheme that the utility model adopts is:

A straightedge capable of measuring diameters is mainly composed of a main ruler, an auxiliary ruler and a slider. There is a longitudinal groove in the middle of the main ruler, and a turning hole is opened on the bottom surface of the middle part of the longitudinal groove. The slider and the The middle part of the auxiliary ruler is connected as a whole, the slider can slide along the longitudinal groove, and the slider can turn at the turning hole.

The beneficial effects of the utility model are:

The straightedge capable of measuring the diameter is reasonable in design and easy to implement, can not only draw straight lines and vertical lines, but also measure the diameter, has a simple structure and is convenient to use.

Description of drawings

Below in conjunction with the figure of the present utility model further explanation:

Fig. 1 is the upper appearance schematic diagram of described main chi;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is the schematic diagram of the appearance of the bottom surface of the main ruler;

Fig. 4 is a schematic diagram when the slider and the middle part of the auxiliary scale are connected as one;

Fig. 5 is a schematic diagram when the diameter-measurable ruler measures the diameter of the circle to be measured;

Fig. 6 is a schematic diagram of the diameter-measurable straightedge as a straightedge.

In the figure, 1. Longitudinal groove, 2. Turning round hole, 3. Vice ruler, 4. Slide block, 5. Circle to be measured.

Detailed ways

Figure 1 is a schematic diagram of the upper appearance of the main ruler, Figure 2 is a sectional view of A-A of Figure 1, and Figure 3 is a schematic diagram of the appearance of the bottom surface of the main ruler, and there is a longitudinal groove (1) in the middle of the main ruler. , the bottom surface of the middle part of the longitudinal groove is provided with a turning hole (2).

Figure 4 is a schematic diagram of when the slider (4) is integrated with the middle part of the auxiliary scale (3), the slider (4) can slide along the longitudinal groove (1), and the slider (4) Turning can be made at the turning hole (2).

FIG. 5 is a schematic diagram of the diameter-measurable ruler measuring the diameter of a circle to be measured. The diameter-measurable ruler is mainly composed of a main ruler, an auxiliary ruler and a slider. By moving the auxiliary scale, the diameter value can be read directly from the main scale. During operation, the starting point of reading on the main ruler coincides with a point on the circle, and then the auxiliary ruler is moved so that the left and right vertices of the auxiliary ruler coincide with the circle at the same time, and the line connecting the left and right vertices is a section of the chord of the circle. The longitudinal centerline of the main chi is exactly the vertical bisector of the chord, and the diameter of the circle is on the vertical bisector of the chord, so it is easy to obtain the circle diameter from the main chi.

Figure 6 is a schematic diagram of the ruler that can measure the diameter as a ruler. When the slider (4) rotates 90 degrees at the turning hole (2), the main ruler and the secondary When the main chi and the auxiliary chi are vertical, they can be used as a straight ruler. Depending on the scope of use, the scale of the main ruler can have different specifications, and the length of the auxiliary ruler can also have different lengths.

Claims (1)

1. the ruler that can measure diameter; Mainly constitute by main scale, secondary chi and slide block; It is characterized in that: the centre of said main scale has cannelure (1), and the bottom surface at the middle part of said cannelure has and turns to circular hole (2), and said slide block (4) connects as one with the middle part of said secondary chi (3); Said slide block (4) can slide along said cannelure (1), and said slide block (4) can be located to turn at the said circular hole (2) that turns to.

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