WO2000009968A1

WO2000009968A1 - Measuring tape

Info

Publication number: WO2000009968A1
Application number: PCT/JP1999/004337
Authority: WO
Inventors: Norio Kusano
Original assignee: Kyoto Me Machine & Electricity Engineering-Manufacturer Co., Ltd.
Priority date: 1998-08-12
Filing date: 1999-08-11
Publication date: 2000-02-24
Also published as: JP2000055601A

Abstract

A measuring tape for taking a direct reading of the diameter or circumference of a subject, comprising a strip material having a given width (W) and a given thickness (t), characterized in that the strip material is marked on the surface thereof with graduations in a unit of length including a zero point and a main graduation which contacts the zero point when the strip material is spirally wound a single turn around the subject of measurement and which corresponds to the diameter or circumference of the subject of measurement. Since the measuring tape can be formed of a strip material of given width and thickness, the material cost and processing cost are very low.

Description

It is convenient because it can measure the circumference and the circumference.

However, the above-mentioned tape measure is inferior in accuracy to the vernier caliper and therefore cheaper than the vernier caliper. However, it is necessary to process it into an irregular shape with a step h. Hard materials must be used. Therefore, it is not easy to carry because it may bend if it is too small and rolled when storing. In addition, since hard materials are used, material costs and processing costs are high for accuracy. Therefore, a first object of the present invention is to provide an inexpensive and highly accurate direct reading tape measure. The second object is to provide a highly accurate tape measure that is excellent in portability. Disclosure of the invention

In order to attain the object, a tape measure for direct reading of a diameter of the present invention is a tape measure for directly reading the diameter of an object, comprising a band-shaped material having a constant width and thickness, and having a surface on the surface of the band-shaped material. A zero point of a scale in units of length, and a main scale corresponding to a diameter of the object to be measured are formed at a contact point between the belt-shaped material and the zero point when the belt-shaped material is spirally wound once around the object to be measured. It is characterized by

Similarly, the tape measure for directly reading the circumference of the present invention is:

A tape measure that directly reads the circumference of the object, on the surface of a band-shaped material with a constant width and thickness, the zero point of the scale in units of length, and this band-shaped material spiraled on the object to be measured. A main scale corresponding to the circumference of the object to be measured is formed at a contact point with the zero point when the coil is wound.

Since the tape measure for direct reading according to the present invention can be made from a band-shaped material having a constant width and thickness, both material costs and processing costs are extremely low. When measuring the diameter or circumference of the object to be measured, unlike the conventional tape measure in which a tape measure is wound on the object as shown in Fig. 1, it does not overlap the extra length and Wind spirally so as not to create gaps.

The main scale for direct reading of the diameter may be formed based on the following principle. In Fig. 1, let B be the point that matches A on the first lap from origin A. The outer length L of the tape measure is equivalent to the straight line distance between AB when the tape measure is deployed as shown in Fig. 2. Therefore, = vit (D + 2 t) and L ² = W ² + P ² hold. These 2 O formula Ri ^{P = {π 2 (D +} 2 t) 2 - W 2) ' c is obtained, et al. Therefore, an arbitrary point close to the longitudinal end of the strip material is defined as a zero point, and a scale is marked D at a distance P from the zero point. The scale of the point to be measured is the diameter of the object.

The main scale for reading the circumference directly is as follows. In FIG. 1, the actual circumference is D = L-2 κ t, so replacing it with 7r D = C results in L = C + 2π t and L ² = W ² + as described above. P ² holds. It these two formulas Ri P = {(C + 2 π t) 2 - W 2} 1 κ 2 is obtained. Therefore, an arbitrary point close to the end of the band-shaped material is defined as a zero point, and a scale is marked c at a distance Ρ from the zero point, so that the point facing the point when the measuring tape is wound around the object to be measured. Is the circumference of the object.

Regardless of whether it is a tape measure for direct reading of the diameter or a tape measure for reading the circumference, it is preferable that the main scale be displayed on both sides of the band-shaped material. As is clear from Fig. 1, if the zero point is displayed on one side of the strip, the point facing the zero when wound on the object to be measured is located on the other side of the strip. Because you do. Therefore, by displaying the main scale on both sides of the band-shaped material, it is not necessary to pay attention to the direction in which the tape is wound around the object during measurement.

Further, it is preferable that a vernier scale be formed instead of the main scale between a certain distance from the zero point. In this case, instead of reading the main scale at the point facing the zero point, first read the value of the main scale at the point facing any point on the vernier scale. Next, read the value of the point on the vernier scale. No. Then, the sum of those two values is the direct or circumferential length. The measurement can be performed with higher accuracy than when the scale is not attached by attaching the vernier scale. The vernier scale contributes to the improvement of accuracy not only when the main scale is formed for direct reading of the diameter or the circumference, but also for all cases where the main scale is formed in units of length.

The tape measure according to the present invention is characterized in that the main scale for direct reading of diameter is provided on the first main surface of the belt-shaped material, and the main scale for direct reading of circumferential length is provided on the second main surface on the opposite side. It can also be used for direct reading of both circumferences. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a view showing a state in which a tape measure is wound around a measurement object in order to explain the principle of the invention.

FIG. 2 is a diagram showing a state in which the tape measure has been developed to explain the principle of the invention.

FIG. 3 is a plan view of a conventional tape measure for direct reading of diameter.

FIG. 4 is a diagram showing a state where the diameter is measured using a conventional tape measure for direct reading of diameter.

FIG. 5 is a plan view of the tape measure of the present embodiment.

FIG. 6 is a bottom view of the tape measure according to the embodiment.

FIG. 7 is a diagram illustrating another method of using the tape measure according to the embodiment. BEST MODE FOR CARRYING OUT THE INVENTION

An embodiment of the present invention will be described together with figures. FIG. 5 is a plan view showing a tape measure for direct reading of the embodiment, and FIG. 6 is a bottom view similarly.

The tape measure has a width W of 19 mm and a thickness t of 0.14 mm, both of which are made of a fixed strip material. Since the width and thickness of the band-shaped material are constant, It can be easily manufactured from not only hardened steel but also cloth containing glass fiber or plastic.

The first major surface of the strip is 44.1 mm, 60.8 mm, 77.lmm,---3 1 12.4 .4 mm from the zero point as shown in Figure 5. A main scale K of 15 mm, 20 mm.2 δ mm>'·' 100 mm is formed at a distance of. This main scale Κ indicates the diameter of the object to be measured. The relationship between these distances and the display scale is designed so that when the distance is Ρ and the scale is D, the formula Ρ = {π ² (D + 2t) ² -W ² } ^1/2 is satisfied. ing. A vernier scale J is formed between the zero point and a distance of 28.26 mm. This vernier scale J calculates 3.14 X (9/10) X 10 = 28.26 from the pi π = 3.14 and obtains a distance 28.8 from the zero point.

It is formed by dividing the area up to 26 mm by 10 into 10 parts. On the other hand, as shown in Fig. 6, the second main surface of the strip-shaped material (the first ridge) is 47.2 min, 99.1 rn m, and 199. 9 mm,

50 mm, 100 mm in.200 mm, at a distance of 300 mm

--· A main scale S of 300 mm is formed. This main scale S indicates the circumference of the object to be measured. The relationship between these distances and the display scale is designed such that when the distance is P and the scale is C, the equation P = {(C + 2 T t) '-W ^{2 2} holds . A vernier scale U is formed between the zero point and a distance of 33 mm.

When measuring the diameter using the tape measure of this embodiment, the tape measure is helically wound around the measurement object such that the first surface shown in FIG. 5 is outside. Then, read the value at the contact point with the zero point or the closest point on the scale on the winding side. If you just want to know the approximate diameter, you can use that value as the diameter. If you want to measure precisely, read the value at the point on the vernier scale that matches any value on the scale on the wrapping side, and read the value The value shall be a decimal fraction of the diameter. This enables highly accurate measurement equivalent to a caliper. When measuring the circumference, it is sufficient to wind the second surface shown in Fig. 5 so that it faces outward, and follow the same procedure as for diameter measurement.

In addition, it is possible to measure not only the outer diameter of a columnar or cylindrical shape but also the outer diameter of an object having an elliptical cross section. Furthermore, as shown in Fig. 7, when the circumference length G of the shaft is subtracted from the measurement length M of one rotation when wound around two shafts, and divided by 2, the pitch V between the shafts can be measured. Can also be. In this case as well, the use of the vernier scale makes it possible to measure with higher accuracy than a conventional tape measure. As described above, the tape measure of this embodiment is easy to manufacture. Thus, the diameter and circumference can be measured with high accuracy. Industrial applicability

Since the tape measure of the present invention can be easily manufactured using various materials, it can be provided to users at low cost. In addition, a wide range of materials can be selected according to the type of material that is excellent in portability, the material that is easy to add, and the use of power.

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(57GTUAGHU YNYZBRR2F FE JI) Summary

Kisokokokodoko

Ibra Rammezun, Nao

Lulu-Majida Tatsulot

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Sibon Kuriri

A tape measure that directly reads the diameter or circumferential length of an akaka object, which is provided with a band-shaped material having a constant width w and a thickness t, and is provided on a surface of the band-shaped material with a scale point in units of length. WMMADHNUDNGRRT EsBEREERLS PP

It is characterized in that the main graduation is set to the day of the formation. A belt with a constant width and thickness Belarus

ナナ鮮鮮

Since it can be made from materials, it is very inexpensive because both materials and processing are very cheap.

Saandodod

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Code used to identify the PCT member on the first page of an international application published under the PCT (Reference) United Arab Emirates Kazatan Russia

Albania Saint Lucia Sudan

Armenia Lichtenstein: Sweden Austria Sri Lan Power Gabo

Australia Liberia Slovenia Azerbaijan Slovakia Boznia Herzegovina Lithonia Sierra Leone

Luxembourg Senegal

Belgian Latvia Switzerland Land Bulgina Faso Moroccan

Bulgaria Monaco Togo—

Moldova Tajikistan Madagascar Tanzania

Former Macedonia-Love Turkmenistan Republic Turkey

Mari Trinidad Tobago Ukraine

Moritania Uganda

Malawi United States

Mexico Pazbekistan J. Vietnam Vietnam Rabbia No. 1 South Africa

Zimbabwe

Boland

Boltgar

Rumania The scope of the claims

1. A tape measure that directly reads the diameter of an object, which is provided with a rectangular material having a fixed width and thickness, and a zero point on a scale in units of length on the surface of the ribbon material, and the ribbon material. A linear scale corresponding to the diameter of the object to be measured, formed at a contact point with the zero point when the object is spirally wound around the object by 1 mm.

2. The main scale is W for the width of the strip-shaped material, t for the thickness, D for the variable in units of length, and {π ² (D + 2t) ² -W ² } ¹ corresponding to each D. The diameter direct-measurement tape according to claim 1, wherein, when the value of ^{/ 2} is P, D is displayed at each point of the distance P in the lengthwise direction from the zero point.

3. The tape measure according to claim 1, wherein the main scale is displayed on both sides of the band-shaped material.

4. The tape measure according to claim 1, wherein a vernier scale is formed instead of the main scale between a certain distance from the zero point.

5. A tape measure that directly reads the circumference of the object, which is provided with a band-shaped material having a certain width and thickness, and on the surface of the band-shaped material, a scale zero point in units of length, and the band-shaped material. And a main scale corresponding to the circumference of the object to be measured is formed at the contact point with the zero point when the object is spirally wound once around the object to be measured. .

6. The main scale is W for width, t for thickness, and unit for length. The variable value is C, corresponding to the C - when the value of {(C + 2 π t) 2 W 2} 1 C is P, the C on each point of the distance P in Nagasun direction Ri by zero The tape measure according to claim 5, wherein the tape measure is formed by being displayed as a scale.

7. The tape measure according to claim 5, wherein the main scale is displayed on both sides of the band-shaped material.

8. The tape measure according to claim 5, wherein a vernier scale is formed in place of the main scale between a certain distance from the zero point.

9. On the surface of the strip-shaped material, a main scale starting from the zero point in units of length and a bar scale instead of the main scale from the zero point of the main scale to a certain distance are formed. And a tape measure characterized by:

Claims

Description Tape measure Technical field

The present invention belongs to a tape measure, particularly a tape measure capable of directly reading a diameter or a circumference fi. Background art

Conventionally, a tape measure (hereinafter, referred to as “direct-reading tape measure”) capable of directly reading a diameter or a circumference is commercially available. As shown in Fig. 3, a conventional tape measure for direct reading has a circumferential length scale in one direction on the surface of a material m with a constant thickness t = = m and a surface that intersects the scale direction only near the zero point. It had a step h corresponding to the winding width in the direction. Then, when measuring the circumference, as shown in Fig. 4, the excess length is wrapped around the cylinder or cylinder to be measured, and the graduation that overlaps the zero point is set on the circumference. I was reading.

The circumference scale is 1 ^ = π (D + 2t) = C + 27t t, where D is the diameter of the object to be measured, C is the circumference, and L is the actual length on the scale. It is formed by displaying C at a position at a distance L from the zero point so that the following relationship holds. As is clear from Fig. 4, the step h was to prevent the zero from being hidden by the scale to be read. In addition, a diameter scale is formed on the back surface by displaying D at a position L away from the zero point according to the same principle.

Unlike a vernier caliper made of a rigid material, such a tape measure can be rolled up and stored when not in use, and has a considerably longer diameter than the vernier caliper.