JP3018102U - Diameter measuring instrument - Google Patents

Abstract

(57) [Abstract] [Purpose] An instrument that can easily and accurately measure the diameter of a cylindrical object without converting it from the circumference to the diameter. [Structure] A measuring instrument characterized by displaying two types of scales, a normal scale and a diameter scale obtained by multiplying it by a pi.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a measuring instrument used for measuring the circumference and diameter of various pipes, circular poles such as electric poles, and standing trees.

[0002]

[Prior art]

 Conventionally, when the cross-section cannot be measured directly with a cylindrical shape, the diameter is measured by measuring the circumference with a measuring instrument such as a surveying tape, convex scale, ribbon rod, etc., and dividing that value by the circumference ratio to determine the diameter. It was calculated.

[0003]

[Problems to be solved by the device]

 This had the following drawbacks. Standards such as pipes, columns, and trees are often indicated by diameter. If short pipes or cross sections can be measured directly, it can be measured with normal scale tape, but standing trees, utility poles, and pipes incorporated in the structure as members can be measured with a caliper if the diameter is small. However, when the diameter could not be measured with calipers, the circumference was measured and the calculation to convert it to the diameter was attached. Also, in the case of taking photographs, it is necessary to enter a conversion formula in the explanation of the diameter of the photographed record, because the circumference is displayed with ordinary measuring instruments.

[0004]

[Means for solving the problem]

 In the present invention, in order to solve the above-mentioned drawbacks, as shown in Fig. 1, a normal scale, that is, a scale on the circumference and a scale converted to the diameter are additionally written on the measuring instrument, and the conversion work from the circumference to the diameter is performed. I omitted it.

[0005]

[Action]

 When measuring the circumference, the diameter is displayed at the same time.

[0006]

Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a measuring instrument with a normal scale of 5 meters, in which the diameter scale according to the present invention is shown together with the normal scale. Diameters up to 159 cm are displayed for this length. FIG. 2 shows a part of FIG. 1 at a scale of 1/1. Here, the diameter scale is a length scale obtained by multiplying a normal scale by a pi. Reference numeral 1 is a diameter measuring instrument according to the present invention, a measuring tape having a normal scale and a diameter scale, a convex scale, a ribbon rod, and the like. 2 is a normal scale and 3 is a diameter scale. As for both 2 and 3, as shown in Fig. 1, there is a method of displaying two kinds of scales on one side and displaying them on the front and back respectively. The diameter scale may be displayed alone. FIG. 3 is a perspective view of a situation where the diameter of a cylinder is being measured. The diameter of the object to be measured can be measured immediately by reading the diameter scale of the diameter instrument at point A, eliminating the need for conversion from the circumference to the diameter. In the present invention, the unit of length is described in meters, but even in units such as inches, since the ratio of the normal scale to the diameter scale is only related to the pi, the length unit can be applied to any unit. .

[0007]

[Effect of device]

 The use of the diameter instrument with both the above-mentioned circumference scale and diameter scale simplifies the diameter measurement of a cylindrical object. If you take a picture of the measurement situation, the diameter can be seen clearly even in the picture. In machining and manufacturing, the circumference length corresponding to the diameter can be easily obtained with a diameter measuring instrument without calculation.

[Brief description of drawings]

FIG. 1 is a plan view of a diameter measuring instrument of the present invention.

FIG. 2 is a scale of a scale of the diameter measuring instrument of the present invention, which is one-half the length.

FIG. 3 is a perspective view of a situation in which the diameter of an object to be measured is measured by a diameter measuring instrument.

[Explanation of symbols]

 1 Diameter measuring instrument 2 Normal scale 3 Diameter scale 4 Object to be measured

Claims (1)

[Scope of utility model registration request] 1. A measuring instrument, characterized in that the diameter and the circumference can be read at the same time when the circumference of a cylindrical object is measured.