JP2001317907A - Multi-purpose measurement unit for radius of curvature - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-purpose measurement unit for radius of curvature, which enables measurement of the radius of curvature with higher accuracy along with superior portability, regardless of varied level in a measuring surface, on which a measuring body for measuring the radium of curvature is placed. SOLUTION: The multi-purpose measurement unit for radius of curvature includes a digital scale body having a measuring bar moving groove carved along the longitudinal direction of the center part of the upper surface side, two rotating arms supported via an arm support member at a lower end part of the digital scale body so as to be rotatable at the right angle to the digital scale body, a support member of a measuring body fixed at the tip of the turning arms, a measuring bar movable vertically along the measuring bar moving groove and an arithmetic unit, which is capable of computing the radius of curvature of the measuring body which receives a measurement signal of a distance to the circular arc surface of the measuring body from the intersection of the axial center line of the two turning arms measured by the measuring bar and the center line of the measuring bar moving groove.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multipurpose radius of curvature measuring instrument. More specifically, the present invention relates to a multipurpose radius of curvature measuring device capable of measuring the radius of curvature of a measuring object having a curvature, for example, an insulated wire, a power cable, or the like.

[0002]

2. Description of the Related Art When laying insulated wires and power cables, it is desirable to lay these insulated wires and power cables as straight as possible. This is because the installation space can be minimized by laying the insulated wires, power cables, etc. as straight as possible, and their performance can be fully exhibited, and the aesthetic appearance can be improved. .

[0003] However, insulated wires, power cables, and the like are long products, and therefore, it is practically difficult to transport the insulated wires, power cables, and the like from a wire manufacturing company to the installation site in a linear package.

[0004] Therefore, insulated wires, power cables, and the like are transported from a wire manufacturing company to the installation site in a drum package wound on a drum or the like. Naturally, insulated wires, power cables, and the like wound on a drum or the like will bend.

[0005] For this reason, electric wire manufacturing companies are improving conductors, insulating coating materials, manufacturing methods, and the like so that even if an insulated electric wire, a power cable, or the like is wound on a drum or the like, a bending habit does not occur.

Further, in shipping inspection of insulated wires and power cables, the radius of curvature of the insulated wires and power cables when they are wound on a drum or the like is measured.

Japanese Utility Model Publication No. Sho 56-65408 discloses a tool for measuring the radius of curvature of insulated wires and power cables.

FIG. 6 is an explanatory front view showing a state where the radius of curvature of a power cable is measured by a conventional radius of curvature measuring instrument.

In FIG. 6, 1 is a punch body, 2 is a scale body,
3 is a scale scale, 4 is a power cable, b is the length of the scale 2, r is a radius of curvature of the power cable 4, and x is a distance from an intermediate point of the punch 1 to an arc surface of the power cable 4.

FIG. 7 shows the distance relationship to each point in FIG. 6 separately.

Here, (Equation 1) holds for the lower triangle formed by Pythagorean theorem.

[0012]

(Equation 1)

Next, when (Equation 1) is opened, (Equation 2) is obtained.

[0014]

(Equation 2)

Next, (Equation 3) is obtained by rearranging (Equation 2).

[0016]

(Equation 3)

Finally, when the equation for calculating r is obtained with respect to (Equation 3), (Equation 4) is obtained.

[0018]

(Equation 4)

That is, the radius of curvature r of the bending of the power cable 4 can be obtained by obtaining the distance x from the midpoint of the punch 1 to the arc surface of the power cable 4 in FIG.

Therefore, the radius of curvature r corresponding to the distance x from the midpoint of the punch 1 to the arc surface of the power cable 4 is calculated in advance by the following equation (4), and the radius of curvature r is set on the scale 2 to correspond to the distance x The radius of curvature r can be displayed as a scale at the position.

FIG. 8 is an enlarged front view of the scale body thus prepared.

In FIG. 8, reference numeral 2 denotes a scale body, and reference numeral 3 denotes a radius of curvature scale.

[0023]

The improvement of the measurement accuracy when measuring the bending of the power cable 4 along the longitudinal direction by the above-described conventional radius of curvature measuring instrument is achieved by placing the measured power cable 4 on a flat ground. Or on a flat, long and large-area measuring table.

However, it is very difficult to secure a flat, long, and large-area measurement point where a long power cable 4 can be placed at a place where the cable is laid. For this reason, it has been difficult to improve the accuracy of the measurement of the radius of curvature using the conventional radius of curvature measuring instrument.

Further, in the conventional curvature radius measuring instrument, the scale is coarse as shown in FIG. 9, and the reading accuracy cannot be improved.

Furthermore, the conventional radius of curvature measuring device has a substantially cross shape, so that it has poor storage properties, and as a result, portability to a place where it is laid is inferior.

The present invention has been made in view of such a point, and an object of the present invention is to solve the above-mentioned drawbacks of the prior art, and to provide a measuring surface on which a measuring object for measuring a radius of curvature has a height. It is an object of the present invention to provide a multipurpose radius of curvature measuring instrument which can measure the radius of curvature with high accuracy and is excellent in portability.

[0028]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a digital scale body in which a measuring rod moving groove is engraved along a longitudinal direction of a central portion on the upper surface side, and a digital scale body at a lower end of the digital scale body. Two rotatable arms supported via an arm support member so as to be rotatable at right angles to the digital scale body, a measurement body support member fixed to a tip of the rotatable arm, and the measurement A measuring rod which can be moved up and down along the rod moving groove, and from an intersection of an axis center line of the two rotatable arms measured by the measuring rod and a center line of the measuring rod moving groove to an arc surface of the measuring object. And an arithmetic unit capable of receiving the distance measurement signal and calculating the radius of curvature of the measurement object.

In the present invention, the pivotable arm can be smoothly pivoted in the direction perpendicular to the digital scale body when the radius of curvature is measured by the arm support member and the curved surface stopper, and cannot be rotated in the reverse outward direction. Sometimes it is preferred to be constructed so that it can be folded inward.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the multipurpose radius of curvature measuring instrument of the present invention will be described with reference to the drawings.

(One Embodiment of Multipurpose Curvature Radius Measuring Device of the Present Invention and Measurement Example of Power Cable Curvature Radius) FIG. 1 shows the measurement of the radius of curvature of a power cable using one embodiment of the multipurpose curvature radius measuring device of the present invention. FIG. 4 is an explanatory front view showing the state of

In FIG. 1, reference numeral 4 denotes an electric power cable, 5 denotes a digital scale made of a hard plastic plate, 6 denotes a measuring rod moving groove, 7, 7 denotes a pivotable arm, 8, 8 denotes an arm supporting member, 9, Reference numeral 9 denotes an L-shaped measuring object supporting member for easy mounting of the measuring object, 10 denotes a measuring rod having a length of Lcm, and 11 denotes a calculator.

That is, the multi-purpose radius of curvature measuring instrument according to one embodiment of the present invention is made of a hard plastic plate, and has a measuring rod moving groove 6 cut along the longitudinal direction of the central portion on the upper surface side. 5 and the digital scale body 5
At the lower end of the arm, rotatable arms 7, 7 supported so as to be rotatable in a direction perpendicular to the digital scale body 5 via arm supporting members 8, 8, and at the tips of the rotatable arms 7, 7, A fixed measuring body support member 9, a measuring rod 10 movable along a measuring rod moving groove 6 cut in the longitudinal direction of the digital scale body 5, and a rotating arm measured by the measuring rod 10. The arithmetic unit 11 is capable of receiving a measurement signal of the distance A from the power supply cable 7 to the arc surface of the power cable 4 and calculating the radius of curvature of the power cable 4.

As shown in FIG. 1, a power cable 4 for measuring a radius of curvature has a center portion of an arc surface supported by a digital scale body 5, and both ends of the arc surface are connected to the lower end of the digital scale body 5 by the digital scale body 5. It is supported by measurement body support members 9, 9 fixed to the tip of arm support members 8, 8 supported in a direction perpendicular to the scale body 5. In other words, the power cable 4 is composed of the digital scale body 5, the measuring body supporting member 9 fixed to the tip of the left rotating arm 7, and the measuring body supporting member fixed to the tip of the right rotating arm 7. 9 and 3 points in total.

In the multipurpose radius of curvature measuring device according to one embodiment of the present invention, first, when the measuring rod 10 is moved along the measuring rod moving groove 6 so as to be aligned with the upper end of the arc surface of the power cable 4, the rotating arm 7, The distance A from the intersection of the axis center line 7 and the center line of the measuring rod moving groove 6 to the arc surface of the power cable 4 is automatically read, and the read distance A signal is transmitted to the arithmetic unit 11. ing.

Next, in the multipurpose radius of curvature measuring device according to one embodiment of the present invention, the arithmetic unit 11 which has received the distance A signal calculates the radius of curvature, and immediately displays the calculated radius of curvature digitally. I have.

FIG. 2 is an explanatory front view showing the principle of calculating the radius of curvature.

FIG. 2 shows the distance relationship to each point in FIG. 2 separately.

Here, (Equation 5) holds for the lower triangle formed by Pythagorean theorem.

[0040]

(Equation 5)

Next, when this (Equation 5) is opened, (Equation 6) is obtained.

[0042]

(Equation 6)

Next, (Equation 7) is obtained by rearranging (Equation 6).

[0044]

(Equation 7)

Finally, the following equation (8) is obtained when the equation (7) is used to determine r.

[0046]

(Equation 8)

Here, the distance from the center line of the measuring rod moving groove 6 of the digital scale body 5 to the tip of the rotatable arms 7, 7 and the blockage B in FIGS. 1 and 2 are 5 cm (rotatable arms 7, 7). Is 2B = 2 × 5 = 10 cm), B ² is 25.

The distance from the center line of the measuring rod moving groove 6 to the tip of the rotatable arms 7, 7, ie, B in FIGS. 1 and 2, is the total length of the rotatable arms 7, 7. Desirably, it is half of 2B.

The radius of curvature r is minimized when the total length 2B of the rotatable arms 7, 7 is equal to the diameter of the circle. Therefore, the mechanical limit of the multipurpose radius of curvature measuring instrument according to one embodiment of the present invention is the limit of measurement.

FIG. 3 is an explanatory front view showing the housed state of the multipurpose radius of curvature measuring instrument according to one embodiment of the present invention.

As can be seen from FIG. 3, in the multi-purpose radius of curvature measuring device according to one embodiment of the present invention, the pivotable arms 7, 7 can be folded 90 °, thereby enabling compact storage and portability. .

FIG. 4 is an enlarged perspective explanatory view of a mounting portion of an arm support member of a multipurpose radius of curvature measuring instrument according to one embodiment of the present invention.

In FIG. 4, 5 is a digital scale, 8
Is an arm support member, and 13 is a curved stopper.

That is, the rotatable arm 7 can be smoothly rotated by the arm support member 8 and the curved surface stopper 13 and cannot be reversely rotated outward.

(Example of Measurement of Curvature Radius of Cylindrical Tube of One Embodiment of Multipurpose Curvature Radius Measuring Device of the Present Invention) FIG. 5 shows the measurement of the radius of curvature of the inner wall of a cylindrical tube by one embodiment of the multipurpose curvature radius measuring device of the present invention. FIG. 4 is a partial cross-sectional front explanatory view showing a state in which the operation is performed.

In FIG. 5, 5 is a digital scale made of a hard plastic plate, 6 is a groove for moving a measuring rod, 7,
7 is a rotating arm, 8 and 8 are arm support members, 9 and 9 are L-shaped measurement striatum support members for easily placing the measurement striatum,
Reference numeral 10 denotes a measuring rod having a length of Lcm, 11 denotes a calculator, and 12 denotes a cylindrical tube.

When measuring the radius of curvature of the inner wall of the cylindrical tube 10 by one embodiment of the multipurpose radius of curvature measuring device of the present invention, first, the tip of the rotatable arms 7, 7 is connected to the cylindrical tube 10 as shown in FIG. Apply to the inner wall.

Next, the lower end of the measuring rod 10 is
It is lowered until it comes into contact with the inner wall of No. 0, and the reading length A of the measuring rod 10 is read.

Next, the value of C shown in FIG. 3 is obtained from (Equation 9) from the reading length A of the measuring rod 10 and the length Lcm of the measuring rod 10.

[0060]

(Equation 9)

In equation (9), since L is a constant, the value of C can be easily obtained.

Using the value of C, the radius of curvature of the inner wall of the cylindrical tube 10 can be easily obtained.

[0063]

The multipurpose radius of curvature measuring device of the present invention can measure the radius of curvature with high precision even if the measuring surface on which the measuring object for measuring the radius of curvature is placed has a height, and has excellent portability. Yes, industrially useful.

[Brief description of the drawings]

FIG. 1 is an explanatory front view showing a state in which the radius of curvature of a power cable is measured using an embodiment of the multipurpose radius of curvature measuring device of the present invention.

FIG. 2 is an explanatory front view showing the principle of calculating the radius of curvature when measuring the radius of curvature of a power cable using one embodiment of the multipurpose radius of curvature measuring device of the present invention.

FIG. 3 is a front explanatory view showing a stored state of the multipurpose radius of curvature measuring device according to one embodiment of the present invention.

FIG. 4 is an enlarged perspective explanatory view of a mounting portion of an arm support member of the multipurpose radius of curvature measuring device according to one embodiment of the present invention.

FIG. 5 is a partially sectional front view showing a state where the radius of curvature of the inner wall of the cylindrical tube is measured by one embodiment of the multipurpose radius of curvature measuring device of the present invention.

FIG. 6 is an explanatory front view showing a state where a radius of curvature of a power cable is measured by a conventional radius of curvature measuring tool.

FIG. 7 is an explanatory front view showing a principle of measuring a radius of curvature of a power cable using a conventional radius of curvature measuring tool.

FIG. 8 is an enlarged front explanatory view showing a scale scale indicating a radius of curvature scaled on a scale of a conventional curvature radius measuring instrument.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Punch body 2 Scale body 3 Scale body scale 4 Power cable 5 Digital scale body 6 Measuring rod moving groove 7 Rotatable arm 8 Arm support member 9 Measuring body support member 10 Measuring rod 11 Computing unit 12 Cylindrical tube 13 Curved surface stopper

Claims (2)

[Claims] 1. A digital scale body in which a measuring rod moving groove is cut along a longitudinal direction of a center portion on an upper surface side, and a lower end of the digital scale body is rotatable in a direction perpendicular to the digital scale body. Two rotatable arms supported via an arm support member, a measuring body support member fixed to the tip of the rotatable arm, and a measuring rod capable of moving up and down along the measuring rod moving groove. Receiving the measurement signal of the distance from the intersection of the axis center line of the two rotatable arms measured by the measuring rod and the center line of the measuring rod moving groove to the arc surface of the measuring object, A multipurpose curvature radius measuring device comprising: a computing device capable of computing a radius of curvature. 2. The pivotable arm has an arm support member and a curved stopper, whereby the pivotable arm can smoothly pivot in a direction perpendicular to the digital scale body when measuring a radius of curvature, and outward. 2. The multipurpose radius-of-curvature measuring instrument according to claim 1, wherein said multipurpose radius-of-curvature measuring instrument is constructed so as to prevent reverse rotation of said multi-angle and to be able to fold inward when carried.