JP3473851B1 - Net tension checker for table tennis - Google Patents

Abstract

Abstract: [PROBLEMS] To check the tension of a table tennis competition net, it is possible to accurately, simply and simultaneously check the strength of the net height conforming to the rules without relying on the referee's intuition, table tennis. Provide a competition net tension checker. SOLUTION: Two legs 12, 1 extending from a crotch portion 11.
2 and a substantially inverted U-shaped scale base 1 and a slide guide 13 provided on the scale base 1 slidably in the longitudinal direction of the scale base 1 at any position. The net straddling member 5 includes a fixable net straddling member 5. The net straddling member 5 is capable of adjusting a leg length D based on the tip of the leg portion 12, and is capable of adjusting a leg length D for a table tennis competition.
Is composed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a table tennis net tension condition checker, and more particularly to a table tennis net tension condition checker capable of easily checking the tension condition of a table tennis net tension condition. Regarding

[0002]

2. Description of the Related Art Regardless of whether it is an international tournament or a domestic tournament, in a regular table tennis competition, there is a certain regulation on the state of the net stretched on the table tennis table used for the table tennis competition. In other words, the height of the net and the strength of its tension, but because these are those who greatly affect the outcome of the competition, their specifications are strictly defined. According to the current rules, the height of the net is 15.25 cm, and the strength of the tension is that the drop of the net caused by placing a 100 g weight on the center of the net is within 1 cm. Therefore, before the competition, it is a rule that it is necessary to check whether the net laying is in accordance with the regulation by checking the height of the net and the strength of the net.

[0003] When the height of the net is proper and proper, when the ball moves above the net without touching the net in the competition, the ball falls on the table tennis table or outside the table before reaching the net. If, or if the ball is completely caught in the net, net tension does not pose a play decision issue. However, when the ball touches the upper end of the net, the strength of the net tension becomes an important issue. That is, generally, when the net tension is low, the ball hit and touched the upper end of the net is likely to enter the opponent's court, and the determination tends to be safe. On the contrary, if the net tension is tight, the ball hit and touched the upper end of the net is hard to enter the opponent's court, and the judgment is likely to be out.

It is considered that the influence of the net appears in various forms depending on the technical characteristics, physical characteristics, and habits of each athlete. Therefore, depending on how tight the net is, the determination of the play during the competition, and eventually the win or loss, may be affected. This is not desirable in order to ensure proper competition and fairness among competitors. However, at present, there are quite a few cases where the inspection is done by relying on the “intuition” of the referee who is in charge of inspecting the state of the network installation.

As a method of enabling an inspection based on an objective standard, a scale attached to a commodity ball case or an independent scale may be used for the inspection of the height (15.25 cm). is there. On the other hand, as a device for checking the strength of the tension, there is a simple inverted U-shaped gauge used overseas. This is an apparatus in which the total weight is 100 g in conformity with the regulation, and the lengths of two inverted U-shaped legs (so to speak, inseam) have a size of 14.25 cm in conformity with the regulation. This is used as a standard for straddling the center of the net and setting the net with strength such that the lower end does not touch the table tennis table (table) (Source: Japan Table Tennis Association).

[0006] An attempt was made to search and search the patent application status regarding a method that enables inspection on an objective basis. Using the text search menu of the patent utility model publication of the Patent Electronic Library (IPDL) on the JPO website, a search was conducted under the following conditions. Search formula summary + claims = table tennis and net and
(Height or Tension or Tension) and (Gauge or Tool or Device or Instrument) Search target: Patent disclosure, utility model disclosure, patent, utility model registration. Results Number of hits 2 1. JP-A-09-2014438 Table tennis table 2. Special Table 2001-523496 Training device However, none of these was recognized as dealing with a method that enables inspection by objective criteria in table tennis competitions.

[0007]

[Patent Document 1] Japanese Patent Laid-Open No. 09-2014438 "Table tennis table". wrap up. Figure 1.

[Patent Document 2] Japanese Patent Publication No. 2001-523496
"Training device". wrap up. Figure 1.

[0008]

As described above, the method for inspecting the tensioned state of the table tennis competition net based on the objective criteria is as follows for the height of the net and the strength of the tension of the net. Some have been provided in the past. However, in the conventional method, the two are checked separately,
No proposal has hitherto been made to perform both of them at the same time or with one device or method.

An object of the present invention is to solve the above drawbacks of the prior art and to provide a table tennis net tension checker capable of easily checking the tension of a table tennis net with an objective standard. Is to provide. That is, it is an object of the present invention to provide a table tennis competition net tension condition checker capable of accurately, easily and simultaneously checking the strength of the net height conforming to the regulations without relying on the intuition of the referee.

[0010]

Means for Solving the Problems The inventors of the present application have made earnest studies on the above problems, and have reached the means for solving the problems. That is, the invention claimed in the present application as means for solving the above problems is as follows.

(1) A substantially inverted U-shaped net height checking scale base material (hereinafter, also simply referred to as "scale base material") having two legs extending from the crotch portion, and the scale base. For net riding slidable on a sliding guide portion provided on a member, slidable in the longitudinal direction of the scale base material (generally referred to as a leg extension direction; the same applies below) and fixed at any position and the member made, the net straddling riding member, legs
The tip of the leg within the range from the tip to the crotch
The height from the bottom to the lower end of the net straddling member
With such a configuration, the leg length (the tip of the leg is
To the crotch, or from the tip to the net
The shorter of the heights to the bottom of the riding member
Say the height of. ) Can be changed, and can be used to inspect the tension of the table tennis net.

(2) At least the adjusted height (from the tip of the leg to the crotch ) of the net straddling member.
Within the range of, from the tip of the leg to the net
The height to the bottom of the riding member. ) Can be fixed to the extent that it does not change due to riding on the net. (1) The table tennis competition net tension condition checker according to (1).

(3) The scale base material is provided with a scale in the longitudinal direction, and the scale has at least a natural height of a predetermined net (height when a load described below is not applied).
Below, it is called "net high school". ) , And a scale indicating a predetermined net height range when a predetermined load is applied (hereinafter, referred to as "load-time net height range") are included, (1) or (2) A table tension checker for table tennis competitions.

(4) For the table tennis competition according to any one of (1) to (3), wherein the total weight is a predetermined weight used for checking the tensioned state of the table tennis competition net. Net tension checker.

(5) The net straddling member is provided so that a lower end thereof is slidable at least in the loaded net height range, (1) to (4).
A net tension checker for table tennis competitions.

(6) The sliding guide portion has a structure having a through hole formed in the longitudinal direction of the scale base material, and the net straddling member slidably mounted on the sliding guide portion extends in the through hole. (1) to (1), characterized in that it comprises a net straddle having a sliding connecting screw, and a fastening means for fixing the net straddling member by being screwed into the connecting screw. A net tension condition checker for table tennis competitions of any of (5).

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the drawings. The present invention is not limited to the examples below. Hereinafter, in the drawings, the same components will be denoted by the same reference numerals for description.

FIG. 1 is an explanatory view showing the structure of a table tennis competition net tension condition checker according to the present invention. In the figure, the inspection device 10 includes two leg portions 12 and 1 extending from a crotch portion 11.
A substantially inverted U-shaped net height checking scale base material (hereinafter, also simply referred to as “scale base material”) 1 having 2 and a sliding guide portion 13 provided on the scale base material 1. The net straddling member 5 that is slidable in the longitudinal direction of the scale base material 1 (a double-headed arrow S in the drawing) and can be fixed at an arbitrary position is provided. The leg
Within the range from the tip of the portion 12 to the crotch portion 11,
From the tip of the leg 12 to the lower end of the net straddling member 5
It is possible to adjust the height of the
D (height from the tip of the leg 12 to the crotch portion 11,
Or the height from the tip to the lower end of the net straddling member 5
Whichever is shorter, whichever is shorter. ) Change
It is basically configured so that it can be used for inspecting the stretched state of the table tennis net (Claim 1).

In the figure, the net straddling member 5 is shown to be located above the crotch portion 11,
Therefore, in this case, the leg length D is the height from the tip portion of the leg portion 12 to the crotch portion 11.

In the figure, the net straddling member 5 is also shown.
Is provided with a guide portion sliding member 51 which is slidably provided on the sliding guide portion 13 and enables the net straddling member 5 to slide on the sliding guide portion 13. The guide portion sliding member 51 is configured so that it can be fastened and fixed using screws as described later, and is fixed by pressing against the inner wall surface of the guide portion 13 using an elastic body such as rubber or urethane resin. It can be formed as appropriate depending on the structure that can be performed. Further, as a material for forming the inspection device 10 of the present invention, resin or other appropriate material can be used, and is not particularly limited.

FIG. 2 is an explanatory diagram showing a state in which the net straddling member 5 is slid downward in the table tennis competition net tension state checker 10 shown in FIG. here,
The net straddling member 5 is shown to be located below the crotch portion 11, and therefore the leg length D in this case is from the tip of the leg 12 to the lower end of the net straddling member 5. It is high.

[0022]

1 and 2, since the table tennis competition net tension condition checker 10 of the present invention is constructed as described above, the scale base material having the two legs 12 and 12 extending from the crotch portion 11 is provided. The net straddling member 5 is slidably installed on the sliding guide portion 13 provided on the guide portion sliding member 51 on the sliding guide portion 13 so as to be slidable in the longitudinal direction of the scale base material 1 and the longitudinal direction of the scale base material 1. The net straddling member 5 can be freely slid on the sliding guide portion 13 (a double-headed arrow S in the drawing) and fixed at an appropriate position by the function. As a result, the leg length D is changed and adjusted.

That is, for example, from the state where the net straddling member 5 is located above the crotch portion 11 in FIG. 1, the net straddling member 5 is placed on the sliding guide portion 13 as shown in FIG. The leg length D can be adjusted by sliding it downward and fixing it at an appropriate position.

The inspection device 10 with the leg length D adjusted
Can be ridden on the center of the upper edge portion of the table tennis competition net at the lower end of the crotch portion 11 or the net straddling member 5 related to the leg length D. Although the net is lowered due to the gravity applied to the net when the main checker 10 rides on the net, at this time, the tip of the leg portion 12 of the main checker 10 in which the leg length D is appropriately adjusted, By inspecting the state of contact between the net and the upper surface of the table tennis table (whether the tip of the leg 12 is in contact with the upper surface of the table),
It is possible to confirm the state of falling of the net, which is subjected to a predetermined weight defined by the rule, and it is possible to determine whether or not the net is stretched as specified. In addition, regarding the height of the net (natural height) that does not weigh the weight, this inspection device 1
It is possible to inspect and judge by providing the necessary scale on 0.

Notwithstanding the above description, the net tension condition checker 10 for table tennis competitions of the present invention is first ridden on the net without adjusting the leg length D, and then the tip portion of the leg portion 12 is moved. Is fixed by sliding the net straddling member 5 at a position where does not come into contact with the upper surface of the table tennis table, and by measuring the leg length D at that time, or with a scale appropriately provided on the scale base material 1. By checking the positional relationship of the leg length D with the lower end of the net straddling member 5, that is, by checking whether or not the lower end is located above a predetermined scale, the weight of the predetermined weight determined by the rule is determined. It is also possible to confirm the situation of the net being dropped and to judge whether the net is installed as stipulated by the confirmation.

In the figure, in order to ensure the above-mentioned operation, the present inspection device 10 includes the net straddling member 5 at least at the adjusted height (from the tip of the leg portion).
Within the range from the crotch to the tip of the leg,
Height to the lower end of the strut member. ) Can be fixed to the extent that it does not change due to riding on the net (claim 2). That is, the net straddling member 5 is slidable on the sliding guide portion 13 by the guide portion sliding member 51 and can be fixed at any position. Even when 10 is straddling the net at the lower end of the member 5, the self-weight is sufficiently supported so that the sliding does not occur due to the self-weight after straddling the net. It

The fixing is performed, for example, by fastening using a screw described later. Others For example, at least one of the guide portion sliding member 51 of the net straddling member 5 or the sliding guide portion 13 is made of rubber having appropriate elasticity, urethane resin, or other appropriate elastic body, The sliding between them is free, but the adjusted leg length D of the net tension condition checker 10 is adjusted by pressing from at least one contact surface to the other contact surface. The fixing means may be such that it does not change even when riding on the net.

With this structure, the present inspection device 10 is connected to the net.
When riding over the
Even if it is in the lower position, it is fixed to the extent that the adjusted leg length D does not change, and confirmation of the situation of falling of the net with a predetermined weight determined by the above-mentioned rule,
Also, it is possible to judge whether or not the installation of the net according to the rule is stipulated.

FIG. 3 is an explanatory view showing another configuration of the table tennis competition net tension condition checker according to the present invention. In the figure, the present inspection device 10M has a configuration in which a scale is provided in the longitudinal direction on the scale base material 1 in addition to the configuration described with reference to FIG. 1, and the scale is at least based on the table tennis competition regulations. Scale 1 that indicates the prescribed net natural height
6A and a scale 16B showing a net height range under load, which is a predetermined net height range when a predetermined load is applied, may be included (claim 3). Scale 16
B indicates the lower limit of the loaded net height range, while the upper limit is indicated by the scale 16A. With this configuration, in the present inspector 10M, the natural height of the net can be easily inspected and determined by using the scale 16A, and by using the scale 16B, the net with a predetermined weight determined by the rule is applied. It is possible to easily confirm the descending situation, and to easily determine whether or not the net installation is in accordance with the regulation.

Further, for the convenience of determining the falling state of the net, the present inspector is formed so that the total weight thereof becomes a predetermined weight used for inspecting the stretched state of the table tennis competition net. It is possible to adopt a configuration (claim 4). Further, for the same purpose, the present inspector may be configured such that the net straddling member 5 is slidable at the lower end portion at least within the net height range under load (claim 5).

As described above, according to the current regulations of regular table tennis competitions, the height of the net is 15.25 cm, and the strength of the net is 1 cm when the net is lowered by placing a 100 g weight on the center of the net. It is said that it is within. Therefore, the above-mentioned scales and weights can be determined in accordance with the regulations, but the present invention is not limited to the present regulations, and appropriate adjustments can be made in response to future changes and additions to the rules. It goes without saying that the configuration can be adopted. Further, the scale is not limited to these, and a scale having an appropriate size that can be used for inspections other than the net tension state inspection, such as a scale for confirming the thickness of the racket, can be provided.

FIG. 4 is a perspective view showing the construction of a table tennis competition net tension state checker provided with a net straddle having a connecting screw according to the present invention. In the figure, this inspection device 20
Is a structure in which the sliding guide portion 23 has a through hole 25 formed in the scale base material 21 in the longitudinal direction thereof, and the net straddling member 50 slidably installed in the sliding guide portion 23 is provided in the through hole 25. It mainly comprises a net straddle body 56 having a connecting screw 54 that slides on and off, and a fastening means 58 for fixing the net straddling member 50 by being screwed into the connecting screw 54. (Claim 6). The shape of the through hole 25 is not particularly limited as long as it is suitable for sliding the net straddling member 50, such as a substantially rectangular shape. With this configuration, the above-mentioned net straddling member can be securely fixed, and the inspection of the net tension state, which is the object of the present invention, can be facilitated.

[0033]

EXAMPLES Examples of the present invention will be described below, but it goes without saying that the present invention is not limited thereto. <Embodiment 1> FIG. 5 is a perspective view showing the construction of an embodiment of a table tennis competition net tension state inspection device 30 of the present invention. As shown in the figure, this example is provided with the configuration of the present inspection device 30 shown in FIG. 3 and various scales in accordance with the current regulations for table tennis competitions. It is manufactured so that the total weight of the inspector is 100g, and each scale is provided for the purpose of inspecting and confirming the following items. (A) 17.25 cm scale The height of a net for table tennis competition using a ball with a diameter of 44 mm (so-called large ball). In the competition using large balls, the method for checking the tension of the net under the above-mentioned load is not specified. (B) Scale of 15.25 cm The height of the net in a regular table tennis competition (the ball has a diameter of 40 mm). (C) Scale of 14.25 cm The net height at the maximum drop of the net allowed in the inspection of the net tension in the normal table tennis competition. (D) Scale of 4.2 cm The height of the net in the table tennis competition for the blind. (E) Scale of 4 mm The thickness of the rubber attached to the racket for table tennis competition, which is the rubber thickness of the two-layer rubber including the sponge layer (so-called sandwich rubber). (F) Scale of 2 mm The thickness of the rubber attached to the racket for table tennis competition, which is the thickness of the rubber of a one-layer rubber (so-called single rubber).

[0034] Net tension checker 3 for table tennis competition of this example
Since 0 is configured as described above, it is not only possible to easily check the net tension (net tension and height) in regular regular table tennis competitions with only this one unit, but also the rubber thickness of the racket. It can also be used for checking the height of the net for large ball competitions and competitions for blind people.

[0035]

Since the table tennis competition net tension condition checker of the present invention is constructed as described above, it is possible to easily check the tension condition of the table tennis competition net with an objective standard. That is, without relying on the referee's intuition, the height of the net and the strength of the tension that meet the regulations can be accurately and accurately determined.
It can be inspected easily and simultaneously.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of a table tennis competition net tension state check device according to the present invention.

2 is an explanatory view showing a state in which a net straddling member is slid downward in the table tennis competition net tension state checker of FIG. 1. FIG.

FIG. 3 is an explanatory view showing another configuration of the net tension state check device for table tennis competition according to the present invention.

FIG. 4 is a perspective view showing the configuration of a table tennis competition net tension condition checker equipped with a net straddle having a connecting screw according to the present invention.

FIG. 5 is a perspective view showing the configuration of an embodiment of a net tension state check device for table tennis competition of the present invention.

[Explanation of symbols]

10, 10M, 20, 30 ... Net tension checker for table tennis competitions, 1, 21 ... Scale base material (scale base material) for net height inspection, 11 ... Crotch part, 12 ... Leg part, 13
... Sliding guide part, 16A ... Scale showing a predetermined net natural height, 16B ... Scale showing a predetermined net height range (a net height range under load) when a predetermined load is applied, 25
... through-holes, 5, 50 ... net straddling member, 51 ... guide part sliding member, 54 ... connecting screw, 56 ... net straddling body, 58 ... fastening means, S ... sliding direction of the net straddling member

Claims (6)

(57) [Claims] 1. An approximately inverted U-shaped net height checking scale base material (hereinafter, also simply referred to as "scale base material") having two legs extending from a crotch portion, and the scale base material. A net straddling member slidably mounted on a sliding guide part provided on the base plate, slidable in the longitudinal direction of the scale base material (generally referred to as a leg extension direction, and the same applies hereinafter) and fixed at an arbitrary position. When,
The net straddling member is formed from the tip of the leg.
Within the range up to the crotch part, from the tip of the leg to the net.
The height to the lower end of the straddle member can be adjusted,
With such a structure, a table tennis net tension checker that can be used to check the tension of a table tennis net. 2. The net straddling member has at least the adjusted height (from the tip portion of the leg portion to the crotch portion).
For climbing over the net from the tip of the leg within the range
The height to the bottom of the member. ) Can be fixed to such an extent that it does not change due to riding on the net, The net tension condition check device for a table tennis competition according to claim 1, characterized in that. 3. The scale base material is provided with a scale in the longitudinal direction, and at least the predetermined natural height of the net (the height when a load described below is not applied.
It is called "net high natural price". ) And a scale indicating a predetermined net height range when a predetermined load is applied (hereinafter, referred to as "load-time net height range") are included. Net tension condition checker for table tennis competition described in 2. 4. The table tennis net according to claim 1, wherein the total weight is a predetermined weight used for checking the tension of the table tennis net. Tension condition checker. 5. The net straddling member is provided so that a lower end portion thereof can slide at least in the loaded net height range, as set forth in any one of claims 1 to 4. Net tension checker for table tennis competitions. 6. The sliding guide portion has a structure having a through hole formed in the scale base material in a longitudinal direction thereof,
The net straddling member slidably mounted on the net straddling member has a connecting screw that slides in the through hole, and the net straddling member is fixed by being screwed into the connecting screw. 6. The table tension competition net tension checker according to claim 1, further comprising: