JP3810071B2 - A device for pinching the lower edge of a net for a volleyball antenna - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a holding device for fixing a volleyball antenna to a volleyball net.
[0002]
[Prior art]
According to the volleyball rules, a volleyball antenna (hereinafter referred to as “antenna”) 101 is attached to both ends of a volleyball net (hereinafter referred to as “net”) 104. As shown in FIG. 6, the lower rope 108 of the net 104 is inserted between the lower net holder 107 of the lower edge holding device 106 and the nut 105, and the nut 105 is screwed from above to hold the lower rope 108. There exists an apparatus which does (for example, refer patent document 1).
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. 53-43260 [0004]
[Problems to be solved by the invention]
However, due to the revision of the rules of the International Volleyball Federation, a 5 cm net lower belt is added to the lower edge of the net 104, so that it is difficult for the lower edge holding device 106 as shown in FIG. Become.
[0005]
For example, in the apparatus shown in FIG. 6, the lower rope 108 is inserted between the lower net holder 107 and the nut 105, and the nut 105 is screwed from above to hold the lower rope 108. However, when the net lower band is set at the lower edge of the net 104, the lower rope 108 cannot be inserted between the lower net holder 107 and the nut 105, and the gap between the lower net holder 107 and the nut 105 is lost. It is difficult to insert the lower rope 108 into the lower rope 108 and screw the nut 105 from above to be held between the lower rope 108.
[0006]
It is also conceivable to use the conventional upper holding device for the lower holding device. However, since there is a difference in function between the upper wire 102 and the lower rope 108, that is, the upper wire 102 suspends the net 105 and the lower rope 108 fixes the shaking of the net 105, the upper holding device is simply used. By simply replacing the lower holding device with the lower holding device, the force with which the lower holding device holds the lower rope 108 and the net lower belt becomes insufficient, and the net 104 may be disengaged from the lower holding device due to vibration of the net during play. I can't stand the power.
[0007]
The present invention has been made in view of such a problem, and an object thereof is to provide an apparatus capable of holding the net lower band at the lower edge of the net.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, a lower edge holding device for a net of a volleyball antenna according to the present invention is a lower edge holding device for an antenna attached to a net lower band of a volleyball net. A net holder, a mover, and an antenna shaft, wherein the lower net holder has a base having a contact surface that contacts the lower end of the net lower band, and a contact between the base and the antenna shaft at a predetermined interval. The movable member has an inclined surface, and the inclined surface is inclined away from the antenna axis as it goes upward, and the holding wall portion The base of the lower net holder is fixed in the vicinity of the lower end of the antenna shaft, and the mover can move along the antenna axis and can stop at any position within a predetermined range. It is characterized by being That.
[0009]
With the above configuration, the net lower band can be held between the holding wall portion and the inclined surface of the mover, so that the lower edge holding device can reliably support the antenna.
[0010]
In addition, by having a fixing wall portion erected at a position facing the holding wall portion across the antenna shaft, the lower net holder is prevented from rotating when the net is inserted into the lower net holder. I can do it.
[0011]
Further, the inner surface of the fixing wall portion and the inner surface of the holding wall portion form a concave portion so that the movable element can be accommodated in the lower net holder and the strength of the entire lower net holder can be increased. Can be increased.
[0012]
In addition, by having a reinforcing rib on the holding wall portion, it is possible to counter the force applied to the holding portion in the radially outward direction from the antenna shaft.
[0013]
Further, the holding wall portion may be higher than the fixing wall portion.
[0014]
Further, the movable element has a truncated conical portion, and the truncated conical portion is formed to have a large diameter on the upper side and a smaller diameter toward the lower side, thereby rotating the movable element. You can just hold the net.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
[0016]
FIG. 1 is a perspective view when the antenna 1 is attached to the net 4. The lower edge holding device 3 which is one embodiment of the present invention is applied to the antenna 1.
[0017]
As shown in FIG. 1, the net 4 is formed of a net upper band 5 into which an upper wire 7 is inserted, a net lower band 6 into which a lower rope 8 is inserted, and a lattice-shaped ball shield 9. . The antenna 1 is formed of an antenna shaft 10, an upper edge holding device 2, and a lower edge holding device 3. The antenna 1 is attached to the net 4 by the upper edge holding device 2 and the lower edge holding device 3 at a position according to the volleyball rules.
[0018]
FIG. 2 is a partial side view of the antenna 1 in a state where the net is held.
[0019]
As shown in FIG. 2, the upper edge holding device 2 includes an upper net holder 22 and an upper holding body 23, and the upper net holder 22 moves as the upper holding body 23 moves upward. The upper wire 7 is held between the upper holding member 23 and the upper holding member 23.
[0020]
The lower edge holding device 3 includes a mover 12, a lower net holder 14, a lower holder cover 21, and an antenna shaft 10. The lower net holder 14 includes a base portion 16, a holding wall portion 15, and a fixing wall portion 17.
[0021]
3A and 3B are views of the lower edge holding device 3, wherein FIG. 3A is an exploded perspective view, FIG. 3B is a longitudinal sectional view, and FIG. 3C is an enlarged perspective view of a net holder. The lower edge holding device 3 will be described with reference to FIG.
[0022]
The base portion 16 is substantially elliptical in a plan view, and has a net contact surface 39 that contacts the lower end of the net lower belt 6 and a mover contact surface 40 that contacts the lower surface of the mover 12, and is near the center. A fixing hole 47 for fixing the antenna shaft 10 is formed. The mover contact surface 40 is one step higher than the net contact surface 39. The step portion 20 formed at the boundary between the net contact surface 39 and the mover contact surface 40 is formed in the vicinity of the fixing hole 47 and faces the inner surface of the holding wall portion 15. The net contact surface 39 is formed with a plurality of ridges 19 extending in the major axis direction of an ellipse that defines the base contour. Further, a projection 41 for fixing the antenna shaft 10 is formed below the fixing hole 47, and a groove for inserting the split pin 11 is formed at the center.
[0023]
The inner surface of the holding wall portion 15 is a concave portion, and is formed so as to stand upright from the net contact surface 39 of the base portion 16 with a predetermined distance from the base portion 16 to the antenna shaft 10. Here, the “concave portion” may be substantially U-shaped, substantially V-shaped, or substantially arc-shaped. Further, in order to increase the strength of the holding wall 15, ribs 18 are formed on the inner surface of the holding wall.
[0024]
The inner surface of the fixing wall portion 17 is formed as a concave portion, and is formed so as to stand upright from the mover contact surface 40 of the base portion with a predetermined distance from the base portion 16 to the antenna shaft 10. Here, the “concave portion” may be substantially U-shaped, substantially V-shaped, or substantially arc-shaped. Further, the fixing wall portion 17 is erected at a position facing the holding wall portion 15 with the antenna shaft 10 interposed therebetween. Both ends of the fixed wall portion 17 coincide with the stepped portion 20 and have a sufficient height to serve as a stopper when the net 4 is inserted. Further, by making the fixing wall portion 17 lower than the holding wall portion 15, the fixing wall portion 17 can be erected at a position closer to the antenna shaft 10, so that the base portion 16 can also be made small. .
[0025]
The mover 12 has a hollow truncated conical portion 13 having a large diameter on the upper side and a smaller diameter toward the lower side, and a substantially cylindrical handle portion connected to the truncated conical portion 13 with a reduced diameter. 42 is formed. Further, the grip portion 42 has anti-slip ridges 43 formed at equal angular intervals on the outer peripheral surface. A through hole 35 for inserting the antenna shaft 10 is formed on the central axis of the movable element 12, and the through hole 35 is screwed to the antenna shaft 10 on the truncated conical portion 13 side. Female threads are formed.
[0026]
The antenna shaft 10 has a male screw portion 49 and an antenna handle portion 24, and can be screwed into the movable element 12. Further, a pin hole 44 penetrates in the vicinity of the lower end of the antenna shaft 10 in the radial direction so that the lower net holder 14 and the antenna shaft 10 can be fixed by the split pin 11.
[0027]
The lower edge portion holding device 3 is assembled as follows (see FIG. 3B). First, the antenna shaft 10 is passed through the movable element 12, and the antenna shaft 10 is passed through the fixing hole 35 of the lower net holder 14. Then, after fixing the antenna shaft 10 to the lower net holder 14 with the split pin 11, the lower holder cover 21 is attached to the lower net holder 14. Then, the net 12 can be fixed by fastening the mover 12 to the antenna shaft 10 with a temporary screw.
[0028]
The mover 12 can move to the lower side of the antenna shaft 10 by rotating the handle portion 42 in the screw tightening direction, and can move until the mover contact surface 40 is reached. In addition, the lower rope 8 can be accommodated by forming a gap between the mover 12 and the net contact surface 39 after the mover 12 and the mover contact surface 40 contact each other. Furthermore, the lower net holder 14 can be made difficult to come off the net lower belt 6 by having the protrusions 19. The side surface of the truncated conical portion 13 after the mover 12 is tightened and the inner surface of the upper end portion of the holding wall portion 15 are configured to have a gap, and when the net lower belt 6 is held in the gap, , So that excessive force is not applied.
[0029]
FIGS. 4A and 4B are side views of the lower edge holding device 3, in which FIG. 4A shows a net-fixable state and FIG. 4B shows a net-holding state.
[0030]
A method of fixing the antenna 1 to the net 4 will be described with reference to FIG.
[0031]
First, after the net upper band 5 is held by the upper edge holding device 2 (not shown), the net lower band 6 is fixed by the lower edge holding device 3.
[0032]
In order to fix the net lower belt 6 with the lower edge holding device 3, first, as shown in FIG. 4A, the net lower belt 6 is placed between the holding wall portion 15 of the lower net holder 14 and the mover 12. The movable element 12 is tightened to the antenna shaft 10 with a temporary screw leaving a gap in which 6 can be easily inserted. Next, the net lower belt 6 is inserted between the holding wall portion 15 of the lower net holder 14 and the movable element 12, and the movable element 12 is tightened in the direction of the lower net holder 14. By doing so, the distance between the holding wall portion 15 and the truncated conical portion 13 of the mover 12 and the distance between the mover 12 and the base portion 16 are reduced, and the net lower belt 6 is held by the lower holding device 3. .
[0033]
Further, since the truncated conical portion 13 of the mover 12 is inclined with respect to the holding wall portion 15, the net lower belt 6 can be held by the lower holding device 3. And, by sandwiching the lower rope 8 between the net contact surface 39 and the mover 12 via the net lower belt, the holding force can be increased as compared with the case where the mover 12 and the holding wall portion 15 are sandwiched. The net lower band 6 can be prevented from being damaged due to the concentration of the holding force.
[0034]
In the above, one Embodiment of this invention was described based on FIGS.
[0035]
Next, another embodiment of the present invention will be described.
[0036]
5A and 5B are views of another embodiment of the lower edge holding device 3, wherein FIG. 5A is an exploded perspective view and FIG. 5B is a longitudinal sectional view.
[0037]
The lower holding device 46 includes a mover clamping nut 25, a mover 26, a lower net holder 28, a lower holder cover 34, and the antenna shaft 10.
[0038]
The mover 26 has a truncated quadrangular pyramid shape, and one of the side surfaces is an inclined surface 27 that inclines away from the antenna shaft 10 as it goes upward. The inclined surface 27 is formed so as to face the inner surface of the holding wall portion 29. The sandwiching wall portion 29 is plate-shaped and is provided with reinforcing ribs 31. The fixing wall 30 is substantially U-shaped and plays a role of guiding the mover 26 in a certain direction. In the vicinity of the center of the base portion 45, a fixing hole 36 penetrates, and the antenna shaft 10 can be inserted. A projection 48 for fixing the antenna shaft 10 is formed below the fixing hole 36, and a groove for inserting the split pin 11 is formed at the center.
[0039]
The lower edge holding device 46 is assembled as follows (see FIG. 5B). First, the antenna shaft 10 is passed through the mover clamping nut 25 and the mover 26, and the antenna shaft 10 is passed through the fixing hole 36 of the lower net holder 28. Then, after the antenna shaft 10 is fixed to the lower net holder 28 with the split pins 11, the lower holder cover 34 is attached to the lower net holder 28. Then, the net can be fixed by fastening the mover fastening nut 25 to the antenna shaft with a temporary screw.
With the above configuration, the net lower band 6 is inserted between the mover 26 and the lower net holder 28, and the mover tightening nut 25 is screwed to hold the net 4 between the mover 26 and the lower net holder 28. I can do it.
[0040]
In addition, the material used for the lower edge holding device in the present invention is not particularly limited, such as a resin material, a metal material, etc., but in view of specific gravity, dimensional stability, rigidity, molding processability, impact properties, A resin material, particularly a thermoplastic resin material or a thermoplastic resin composition is preferred.
[0041]
Examples of the thermoplastic resin include polystyrene, acrylic resin, polyethylene, polypropylene, polyamide, polyester, polycarbonate, aromatic polyamide, aromatic polyester, and polyetheretherketone. In order to adjust the dimensional stability, rigidity and impact resistance, one or more combinations of the above resins, one or more combinations of resins with different molecular weight distributions, or elastic weight Examples of the composition include blends with copolymers, copolymerization, and combinations by alloying.
[0042]
The elastic polymer refers to a polymer copolymerized with a rubber component having a glass transition temperature of 10 ° C. or lower, preferably −10 ° C. or lower, more preferably −30 ° C. or lower. Examples of rubber components include polybutadiene, polyisoprene, and diene copolymers (for example, random and block copolymers of styrene / butadiene, acrylonitrile / butadiene copolymers, and acrylic / butadiene rubbers (alkyl acrylate esters or Copolymers of ethylene and α-olefins (eg, ethylene / propylene random copolymers and block copolymers, ethylene / butene random copolymers and blocks). Copolymers), copolymers of ethylene and unsaturated carboxylic acid esters (for example, ethylene / methacrylate copolymers and ethylene / butyl acrylate copolymers), copolymers of ethylene and aliphatic vinyl (for example, ,ethylene· Acid vinyl copolymer, etc.), ethylene, propylene, and non-conjugated diene terpolymer (eg, ethylene / propylene / hexadiene copolymer), acrylic rubber (eg, polybutyl acrylate, poly (2-ethylhexyl acrylate), and butyl) Acrylate and 2-ethylhexyl acrylate copolymer, etc.), and silicone rubber (for example, polyorganosiloxane rubber, IPN type rubber comprising a polyorganosiloxane rubber component and a polyalkyl (meth) acrylate rubber component, ie, 2 And rubber having a structure in which two rubber components are entangled with each other so that they cannot be separated, and an IPN type rubber comprising a polyorganosiloxane rubber component and a polyisobutylene rubber component.
[0043]
The composition of the composition is not particularly limited. For example, as described above, other thermoplastic polymers, elastic polymers, etc., reinforcing fillers, lubricants, stabilizers, colorants, ultraviolet absorbers, An antioxidant, a mold release agent, etc. can be mentioned.
[0044]
Glass fiber, glass flake, glass bead, glass balloon, carbon fiber, carbon flake, carbon bead, talc, clay, wollastonite, mica, calcium carbonate, various inorganic whiskers, metal fiber, metal flake, metal Examples thereof include coated glass fiber, metal-coated glass flake, metal-coated carbon fiber, heat-resistant organic fiber, and heat-resistant organic fiber powder. Among these, those containing talc, clay, wollastonite, mica, various inorganic whiskers and the like are preferable. Of these, talc, mica, and wollastonite are more preferable. Furthermore, talc is particularly suitable.
[0045]
【The invention's effect】
According to the present invention, the lower net holding device can easily hold the net lower band, and by stopping the movable element at an arbitrary position, it is possible to deal with the net lower band having different thicknesses.
[Brief description of the drawings]
FIG. 1 is a perspective view when an antenna 1 is attached to a net 4. FIG.
FIG. 2 is a partial side view of the antenna 1 in a state where the net 4 is held.
FIGS. 3A and 3B are views of the lower edge holding device 3, in which FIG. 3A is an exploded perspective view, and FIG. 3B is a longitudinal sectional view;
FIGS. 4A and 4B are side views of the lower edge holding device 3, in which FIG. 4A shows a net-fixable state and FIG. 4B shows a net holding state.
FIGS. 5A and 5B are views of another embodiment of the lower edge holding device 3, wherein FIG. 5A is an exploded perspective view, and FIG. 5B is a longitudinal sectional view.
FIG. 6 is a cross-sectional view of one embodiment of the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Antenna 3 Lower edge holding device 4 Net 6 Net lower belt 10 Antenna shaft 12 Movable element 13 Cone truncated part 14 Lower net holder 15 Holding wall part 17 Fixed wall part 18 Reinforcing rib 27 Inclined surface

Claims (7)

In the lower edge holding device for the volleyball antenna attached to the net lower belt of the volleyball net,
The lower edge holding device has a lower net holder, a mover, and an antenna shaft,
The lower net holder has a base portion having a contact surface that contacts the lower end of the net lower belt, and a holding wall portion standing from the contact surface of the base portion with a predetermined distance from the antenna shaft. ,
The mover has an inclined surface,
The inclined surface is inclined away from the antenna axis as going upward, and is opposed to the inner surface of the holding wall portion,
The base of the lower net holder is fixed near the lower end of the antenna shaft;
A device for holding a lower edge of a net of a volleyball antenna, wherein the movable element is movable along the antenna axis and can be stopped at an arbitrary position within a predetermined range. 2. The lower edge holding device for a net of a volleyball antenna according to claim 1, further comprising a fixing wall portion erected at a position facing the holding wall portion across the antenna shaft. The lower edge holding apparatus of the net | network of the volleyball antenna of Claim 2 in which the inner surface of this fixing wall part forms the concave part. 4. A device for holding a lower edge of a net for a volleyball antenna according to claim 1, wherein a reinforcing rib is provided on the holding wall. 5. The lower edge holding device for a net of a volleyball antenna according to claim 1, wherein an inner surface of the holding wall portion forms a concave portion. 6. A device for holding a lower edge of a net of a volleyball antenna according to claim 2, wherein the holding wall portion is higher than the fixing wall portion. The mover has a truncated cone;
7. A device for holding a lower edge of a net of a volleyball antenna according to claim 1, wherein the truncated conical portion is formed such that the upper part has a larger diameter and the diameter becomes smaller as going downward.

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