Ball measuring tool

The present invention relates to a ball measuring tool for measuring the diameter and sphericity of a ball that is inflated by injecting gas.

Generally, for example, a ball used in soft volleyball, soft dodge ball, soft handball, etc. is used by injecting air and inflating it to a specified diameter. When inflating by injecting air, it is difficult to tell whether or not the size has reached a specified size. Therefore, for example, a measuring tool as disclosed in Patent Documents 1 and 2 may be used.

The measuring tool of Patent Document 1 includes two annular ribbons, and these annular ribbons are integrated in a crossed state. The inner diameter of the annular ribbon is set to be the same as the specified diameter of the ball to be measured. By putting a deflated ball in the annular ribbon and injecting air, the ball is inflated, and when the outer peripheral surface of the ball comes into contact with the entire annular ribbon, it is grasped that the ball has reached the specified size. You can do it.

Further, the measuring tool of Patent Document 2 includes an arm curved in an arc shape, and one end portion and the other end portion of the arm are arranged so as to coincide with a line passing through the diameter of the ball and the outer peripheral surface of the ball. This makes it possible to measure the diameter of the ball.

<p><patcit num="1"><text>Japanese Patent No. 3425433</text></patcit><patcit num="2"><text>Japanese Patent Application Laid-Open No. 2002-5606</text></patcit></p>

<p> By the way, the sphericity of the ball may decrease due to dents or partial bulges due to aging or the like. Even if the sphericity is reduced, it is difficult to understand at first glance, and you may feel a sense of discomfort if you continue to use the product with the sphericity reduced. This is especially problematic in official matches.</p><p> However, although the diameter of the ball can be measured by the measuring tools of Patent Documents 1 and 2, it is not possible to obtain the sphericity.</p><p> That is, since the measuring tool of Patent Document 1 uses an annular ribbon, for example, even if a part of the ball has a bulge, the ribbon is easily deformed so as to correspond to the shape of the bulge. Therefore, it cannot be determined whether or not the ball has a bulge. In addition, the influence of the bulge of the ball may adversely affect the diameter measurement result, making it difficult to accurately measure the diameter.</p><p> Further, in the measuring tool of Patent Document 2, since one end and the other end of the arm are only applied to the outer peripheral surface of the ball, there is a gap in most of the outer peripheral surface of the arm and the ball, and a part of the ball has a gap. I don't know if there are dents or bulges.</p><p> Further, when using the measuring tool of Patent Document 1, it is necessary to inflate the deflated ball in a state of being put in the annular ribbon, which may be troublesome. Further, when the measuring tool of Patent Document 2 is used, the correct diameter cannot be obtained unless one end and the other end of the arm are accurately aligned on the line passing through the diameter of the ball, so that the matching operation is complicated. Is.</p><p> The present invention has been made in view of this point, and an object of the present invention is to enable easy and accurate measurement of the diameter and sphericity of a ball inflated by injecting gas. It is in.</p>

<p> In order to achieve the above object, in the present invention, a ball contact portion formed in a semicircular arc shape is provided, and the outer peripheral surface of the ball is brought into contact with the ball contact portion.</p><p> The first invention is a ball measuring tool for measuring the diameter and sphericity of a ball that is inflated by injecting gas into a semi-arc shape obtained by halving the circumference having the same diameter as the specified diameter of the ball. It is formed and is characterized by having a ball contact portion for contacting the outer peripheral surfaces of the balls and measuring the diameter and sphericity of the balls.</p><p> According to this configuration, when the ball is brought into contact with the ball contact portion, the ball contact portion has a semi-arc shape. Therefore, when the diameter of the ball is smaller than the specified value, between the outer peripheral surface of the ball and the ball contact portion. If a gap is formed and the diameter of the ball is larger than the specified value, the ball will protrude from the end of the ball contact portion. This makes it possible to know whether or not the ball has a specified diameter.</p><p> Further, when a part of the ball has a dent, a gap is formed in a part between the semicircular arc-shaped ball contact portion and the outer peripheral surface of the ball, and the part of the ball bulges. Similarly, if there is, a gap is formed in a part between the outer peripheral surface of the ball and the ball contact portion. As a result, the sphericity of the ball, that is, whether or not the ball has a dent or a bulge, and how large the size is can be obtained.</p><p> Further, when measuring the diameter and sphericity of the ball, since the ball contact portion has a semicircular arc shape, it is only necessary to bring the outer peripheral surface of the ball into contact with the ball contact portion from the open side of the ball contact portion, which is a conventional measuring tool. The work is easier than.</p><p> The second invention is characterized in that, in the first invention, the periphery of the ball contact portion is colored in a dark color.</p><p> That is, when measuring the sphericity of the ball, if a dent or the like is formed in the ball as described above, a gap is formed between the outer peripheral surface of the ball and the ball contact portion. When the gap is formed, the periphery of the ball contact portion is darkened, so that the light entering the gap can be clearly seen, and the existence of the gap and the size of the gap can be easily grasped.</p><p> The third invention is characterized in that, in the first or second invention, a scale is provided around the ball contact portion.</p><p> According to this configuration, when a gap is formed between the outer peripheral surface of the ball and the ball contact portion, the size of the gap can be specifically obtained as an absolute value.</p><p> The fourth invention includes a first plate material and a second plate material arranged so as to extend substantially vertically in any one of the first to third inventions, and the first plate material and the second plate material are flat surfaces. It is characterized in that it is connected in a state of intersecting each other visually, a ball contact portion is formed on the upper edge portion of the first plate material, and a ball contact portion is formed on the upper edge portion of the second plate material. is there.</p><p> According to this configuration, since the first plate material and the second plate material intersect in a plan view, these plate materials are in a stable state on, for example, a desk or a floor surface. Since the ball contact portion is formed on the upper edge portion of the first plate material and the second plate material, it is possible to inflate the ball by injecting air while the ball is placed on the ball contact portion.</p><p> Further, after the ball is inflated, the ball can be placed at the ball contact portion of the first plate material and the second plate material.</p><p> The fifth invention is characterized in that, in the fourth invention, the first plate material is formed with a notch in which the second plate material is fitted.</p><p> According to this configuration, the first plate material and the second plate material can be easily joined by fitting the notch portion of the first plate material into the second plate material.</p>

<p> According to the first invention, the diameter and sphericity of the ball are adjusted by bringing the outer peripheral surface of the ball into contact with the ball contact portion formed in a semi-arc shape in which the circumference having the same diameter as the specified diameter of the ball is halved. Since it can be measured, it is possible to accurately determine whether the diameter of the ball is the specified diameter and the sphericity of the ball by the simple operation of bringing the outer peripheral surface of the ball into contact with the ball contact portion. And it can be easily grasped.</p><p> According to the second invention, since the periphery of the ball contact portion is colored in a dark color, when measuring the sphericity of the ball, the existence and size of the gap between the outer peripheral surface of the ball and the ball contact portion are determined. It becomes easier to grasp, and the sphericity can be measured more accurately and easily.</p><p> According to the third invention, since the scale is provided around the ball contact portion, when a gap is formed between the outer peripheral surface of the ball and the ball contact portion, the size of the gap is used as an absolute value. It is possible to determine whether or not the ball can be used.</p><p> According to the fourth invention, the first plate material and the second plate material extending substantially vertically are joined in a state of intersecting each other in a plan view, and a ball contact portion is formed on the upper edge portion of these plate materials, so that the ball is inflated. The ball can be easily inflated at the ball contact portion, and the ball measuring tool can be used as a stand on which the ball is placed.</p><p> According to the fifth invention, since the notch portion into which the second plate material fits is formed in the first plate material, the first plate material and the second plate material can be easily joined when the ball measuring tool is used, and the second plate material can be easily connected at the time of use. Convenience is improved.</p>

<figref num="1">It is a perspective view of the ball measuring tool which concerns on embodiment.</figref><figref num="2">It is a side view of the ball measuring tool.</figref><figref num="3">It is an exploded perspective view of a ball measuring tool.</figref><figref num="4">It is a side view of the first plate material.</figref><figref num="5">It is a side view of the 2nd plate material.</figref><figref num="6">It is a figure corresponding to FIG. 1 explaining a state in which a ball is inflated.</figref><figref num="7">It is a figure corresponding to FIG. 1 in which a ball in an inflated state is placed.</figref><figref num="8">It is a figure corresponding to FIG. 2 in which a ball with a dent is placed.</figref>

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is essentially merely an example and is not intended to limit the present invention, its application or its use.

FIG. 1 shows a ball measuring tool 1 according to an embodiment of the present invention. This ball measuring tool 1 is for measuring the diameter and sphericity of the ball B (shown in FIGS. 7, 8 and the like) used in the soft volleyball competition, and is a stand on which the ball B is placed. It can also be used as.

As shown in FIGS. 2 and 3, the ball measuring unit 1 is configured by combining the first plate material 10 and the second plate material 20. The first plate member 10 and the second plate member 20 are arranged so as to extend substantially vertically, and are joined in a state of being substantially orthogonal to each other in a plan view.

The first plate material 10 is a flat plate formed by cutting cardboard, and the vertical dimension is set shorter than the horizontal dimension in the side view shown in FIG. The thickness of the first plate material 10 is set to about 3 mm.

The upper edge portion of the first plate member 10 is cut out in a semicircular shape, and the ball contact portion 10a is formed by the edge portion of the cutout portion. The ball contact portion 10a is for contacting the outer peripheral surfaces of the ball B to measure the diameter and sphericity of the ball B, and the arc shape has a circumference having the same diameter as the specified diameter of the ball B. The shape is halved. The specified diameter of the ball B is a diameter obtained from the circumference defined by the regulation of soft volleyball, and is 250 mm in this embodiment.

Both side edges of the first plate member 10 extend linearly substantially parallel to each other. The length of both edges is set to about 180 mm. Further, the lower edge portion of the first plate member 10 extends substantially in a straight line, and the length thereof is set to about 300 mm. A notch 10b into which the second plate member 20 fits is formed on the lower side of the first plate member 10. The cutout portion 10b has a slit shape extending in the vertical direction at the central portion in the longitudinal direction of the lower portion of the first plate member 10, and is open downward. The length of the notch 10b is said to be about 30 mm. Below the edge of the notch 10b, a widened edge 10c formed so that the slit width becomes wider toward the lower end is provided. Further, each corner of the first plate member 10 is curved.

The periphery of the ball contact portion 10a of the first plate material 10 is a colored portion 10d colored in black. The colored portion 10d is formed of a line having a predetermined width extending in an arc shape along the ball contact portion 10a, and is similarly provided on both sides of the first plate material 10. The color of the colored portion 10d is not limited to black, and may be a dark color such as dark gray, dark blue, or dark brown.

A scale 10e is provided around the ball contact portion of the first plate material 10. The scale 10e is provided on the entire surface of both sides of the first plate material 10 except for the colored portion 10d. The scale 10e is composed of a large number of vertical lines drawn at 1 mm intervals and a large number of horizontal lines drawn at the same intervals so as to be orthogonal to the vertical lines, and is similar to the scale on graph paper. Is.

As shown in FIG. 5, the second plate material 20 is configured in the same manner as the first plate material 10. That is, a ball contact portion 20a is formed on the upper edge portion of the second plate material 20, and a coloring portion 20d and a scale 20e are provided on both surfaces.

The second plate material 20 is provided with a notch 20b into which the first plate material 10 is fitted. The notch 20b has a slit shape extending downward from the central portion of the ball contact portion 20a, and is open upward. The length of the notch 20b is said to be about 30 mm. On the upper side of the edge portion of the notch portion 20b, a widened edge portion 20c formed so that the slit width becomes wider toward the upper end is provided.

An illustration D for explaining the usage procedure of the ball measuring tool 1 is drawn on one surface of the second plate material 20 (shown only in FIG. 5). This explanatory illustration D has three diagrams, a diagram showing how to connect the first plate material 10 and the second plate material 20, a diagram when the deflated ball B is inflated, and a diagram showing the inflated state of the ball B. Includes.

Next, a procedure for using the ball measuring tool 1 configured as described above will be described. When not in use, the first plate material 10 and the second plate material 20 may be stacked in the thickness direction so that they can be compactly assembled.

At the time of use, the first plate material 10 and the second plate material 20 are combined. That is, as shown in FIG. 1, the second plate material 20 is fitted into the cutout portion 10b of the first plate material 10, and the first plate material 10 is fitted into the cutout portion 20b of the second plate material 20. At this time, the notch portion 10b of the first plate material 10 is inserted into the notch portion 20b of the second plate material 20. Further, since the widening edge portion 10c is formed in the notch portion 10b of the first plate material 10 and the widening edge portion 20c is formed in the notch portion 20b of the second plate material 20, the second plate material 20 is notched by the widening edge portion 10c. Along with being guided to the portion 10b, the first plate member 10 is guided to the notch portion 20b by the widening edge portion 20c. As a result, the joining work between the first plate material 10 and the second plate material 20 can be easily performed. Further, since the illustration D for explanation is described on the second plate material 20, this joining work can be performed correctly even by a person who is using the ball measuring tool 1 for the first time.

When the first plate material 10 and the second plate material 20 are combined as described above, both plate materials 10 and 20 are substantially orthogonal to each other in a plan view. As a result, the ball measuring tool 1 becomes stable when placed on a desk, floor, or the like, for example.

Then, as shown in FIG. 6, the deflated ball B is placed on the ball contact portion 10a of the first plate material 10 and the ball contact portion 20a of the second plate material 20. An air injector 100 is connected to the ball B. When air is injected into the ball B by the air injector 100, the ball B swells on the ball contact portions 10a and 20a.

As shown by the virtual line in FIG. 2, when the diameter of the ball B is smaller than the specified diameter, a large gap is formed between the ball contact portions 10a and 20a and the outer peripheral surface of the ball B. It's easy to see that the worker needs to inflate more. On the other hand, when the ball B is inflated too much, the ball contact portion 10a bites into the ball B and the ball B protrudes from the edges of the ball contact portions 10a and 20a, so that the operator can easily understand that the ball B is inflated too much.

In this way, the workability is good because it is possible to know whether or not the diameter has reached the specified size simply by inflating the ball B while keeping it on the ball contact portions 10a and 20a without moving it.

Further, since the work of inflating the ball B on the ball contact portions 10a and 20a can be easily grasped by looking at the illustration D for explanation, even a person who uses the ball measuring tool 1 for the first time can correctly perform the work.

The inflated ball B can be placed on the ball contact portions 10a and 20a as shown in FIG. 7, and the ball measuring tool 1 functions as a stand.

Further, as shown in FIG. 8, for example, when a dent is formed due to aging of the ball B or the like, a gap S is formed between the ball contact portion 20a of the second plate material 20 and the outer peripheral surface of the ball B. Will be. The sphericity is obtained by the shape of the gap S.

At this time, since the black colored portion 20d is provided around the ball contact portion 20a, the light entering the gap S can be clearly seen, and the shape and size of the gap S can be easily understood. Further, since the scale 20e (shown in FIG. 5) is provided around the ball contact portion 20a, the size of the gap S can be specifically obtained as an absolute value. The sphericity of the ball B can be measured in the same manner by using the ball contact portion 10a of the first plate material 10. Further, even when the ball B has a bulge, a gap is similarly formed between the ball contact portions 10a and 20a and the outer peripheral surface of the ball B, so that the sphericity of the ball B can be obtained.

By rotating the ball B on the ball contact portions 10a and 20a, it is possible to confirm the presence or absence of dents and bulges over the entire circumference of the ball B.

As described above, according to the ball measuring tool 1 according to this embodiment, the balls are formed on the ball contact portions 10a and 20a formed in a semi-arc shape by halving the circumference having the same diameter as the specified diameter of the ball B. Since the diameter and sphericity of the ball B can be measured by contacting the outer peripheral surface of B, the diameter of the ball B can be determined by a simple operation of bringing the outer peripheral surface of the ball B into contact with the ball contact portions 10a and 20a. It is possible to accurately and easily grasp whether or not the ball has a diameter of the ball B and what the sphericity of the ball B is.

Further, since the periphery of the ball contact portions 10a and 20a is colored black, the existence of a gap S between the outer peripheral surface of the ball B and the ball contact portions 10a and 20a when measuring the sphericity of the ball B and its presence. The size becomes easy to understand, and the sphericity can be measured more accurately and easily.

Further, since the scales 10e and 20e are provided around the ball contact portions 10a and 20a, the size of the gap S is formed between the outer peripheral surface of the ball B and the ball contact portions 10a and 20a. Can be specifically obtained as an absolute value.

Further, the first plate material 10 and the second plate material 20 extending substantially vertically are joined in a state of intersecting each other in a plan view, and ball contact portions 10a and 20a are formed on the upper edges of these plate materials 10 and 20. When inflating B, it can be easily inflated by placing it on the ball contact portions 10a and 20a, and the ball measuring tool 1 can be used as a stand on which the inflated ball B is placed.

Further, since the notch portion 10b into which the second plate material 20 fits is formed in the first plate material 10, the first plate material 10 and the second plate material 20 can be easily connected when the ball measuring tool 1 is used, which is convenient. improves.

The present invention can be applied not only to the measurement of the ball B for soft volleyball but also to the measurement of a ball used in, for example, a soft dodge ball, a soft handball, etc. It can be used to measure various balls that are inflated to the diameter. When changing the type of balls, at least the shapes of the ball contact portions 10a and 20a may be changed according to the diameter of each ball.

Further, a gas other than air may be injected into the ball B.

Further, in the above embodiment, the colored portions 10d and 20d are provided on the first plate material 10 and the second plate material 20, but one or both of these colored portions 10d and 20d may be omitted.

Further, in the above embodiment, the scales 10e and 20e are provided on the first plate material 10 and the second plate material 20, but one or both of these scales 10e and 20e may be omitted.

Further, in the above embodiment, the illustration D for explanation is described on the second plate material 20, but the illustration D for explanation may be omitted.

Further, the materials of the first plate material 10 and the second plate material 20 are not limited to cardboard, and may be, for example, a resin plate or the like.

Further, in the above embodiment, the outer shapes of the first plate material 10 and the second plate material 20 are made the same so that the first plate material 10 and the second plate material 20 extend in four directions in a plan view. Not limited to this, the outer shapes of the first plate material 10 and the second plate material 20 may be different from each other. For example, the first plate material 10 and the second plate material 20 may extend in three directions in a plan view. Further, a third plate material may be provided.

Further, the first plate material 10 and the second plate material 20 may be integrated with each other via, for example, a hinge. As a result, the first plate material 10 and the second plate material 20 can be stacked when not in use, while the first plate material 10 can be rotated around the hinge with respect to the second plate material 20 to be deployed when in use. it can.

Further, it does not matter even if a notch of about several mm (for example, the notch 20b of the second plate member 20) is formed in the ball contact portions 10a and 20a. That is, a notch having such a width is sufficiently smaller than the diameter of the ball B (250 mm), and therefore has no effect on the measurement of the diameter and the sphericity of the ball B.

As described above, the ball measuring tool according to the present invention can be applied to measure the diameter and sphericity of a ball used in, for example, soft volleyball.

1 Ball measuring tool 10 1st plate material 10a ball contact 10b notch 10d Colored part 10e scale 20 Second plate material 20b notch 20d Colored part 20e scale 100 air injector B ball S gap