JP3146410U - Hollow ball - Google Patents

Abstract

Provided is a hollow ball that is not easily damaged even when a large striking force is repeatedly applied.
A resin hollow comprising an inner shell 1 in which a plurality of inner shell parts 2 and 3 are joined at a joint 4 and an outer skin 5 that covers the joint 4 and is fused to the parts 2 and 3. Regarding the ball. The joint 4 includes a contact surface in which a plurality of parts contact each other in the circumferential direction in the vicinity of the inner surface of the inner shell 1, and a plurality of parts that are separated from each other in the circumferential direction in the vicinity of the outer surface of the inner shell 1. The facing surface facing in the state, the contact surface and the facing surface are connected, a fitting surface in which the plurality of parts 2 and 3 are fitted to each other along the circumferential direction, and the resin constituting the skin 5 is the facing surface And a first fusion part that enters the first gap D1 therebetween and fuses the opposing surfaces to each other.
[Selection] Figure 1

Description

  The present invention relates to a hollow ball, and more particularly to a hollow ball for park golf or ground golf.

In recent years, park golf and ground golf, which can be easily performed at a dedicated ground, a park, a riverbed, or the like, are becoming popular for general golf performed at a golf course.
In such park golf and ground golf, resin-made hollow balls having high resilience when hit at high speed are used.
If the ball is not hollow and is filled with resin to the inside, only the portion near the surface of the resin is locally deformed when hitting at high speed, and the repulsive force is small. On the other hand, since the entire ball is deformed at the time of high-speed hitting, since the deformation is large, a larger repulsive force can be obtained.

As the hollow ball, a ball having a hollow inner shell obtained by joining a pair of hemispherical parts and a skin covering the inner shell has been proposed. (See Patent Documents 1 and 2).
JP 2006-212151 (abstract) JP2007-29325 (abstract)

In the hollow ball of Patent Document 1, a pair of hemispheres are physically fitted to form an inner shell, and the inner shell is covered with a skin.
However, since the pair of hemispheres constituting the inner shell are joined only by physical fitting, if the ball is repeatedly hit, the hemispheres are separated from each other because the deformation of the ball is large as described above. In some cases, the ball may be damaged (a minute gap is generated at the joint surface between the hemispheres).
In the hollow ball of Patent Document 2, a part of the joining surface is fused by the resin by slightly entering a resin constituting the skin into a part of the joining surface of the pair of hemispheres.
However, in the hollow ball of Patent Document 2, when the impact from the outside by hitting reaches the joint portion and the hitting is repeated, both hemispheres may be separated from each other and the ball may be damaged.

  Accordingly, an object of the present invention is to provide a hollow ball that is not easily damaged even when a large striking force is repeatedly applied.

  In order to achieve the above object, a hollow ball of the present invention is a resin comprising an inner shell in which a plurality of inner shell parts are joined at a joint, and a skin that covers the joint and is fused to the part. In the hollow ball made of steel, the joint portion includes a contact surface in which a plurality of parts contact each other in the circumferential direction in the vicinity of the inner surface of the inner shell, and a plurality of parts in the circumferential direction in the vicinity of the outer surface of the inner shell. A facing surface facing each other in a state of being separated from each other, a fitting surface in which a plurality of parts are fitted to each other along a circumferential direction, and a resin constituting the skin A first fusion part that enters the first gap between the opposed surfaces and fuses the opposed surfaces together.

  According to the present invention, the inner shell parts are fitted to each other, and the resin of the skin enters the first gap formed on the opposing surfaces of the inner shell parts, and the opposing surfaces are fused. Therefore, cracks are unlikely to occur on the facing surface. Therefore, even if a large impact force is repeatedly applied, there is no possibility that the hollow ball is damaged.

In the present invention, as a resin that can be used for the inner shell and the outer skin, for example, if it is a thermoplastic resin, for example, ionomer resin, polycarbonate, polylactic acid, polyamide, methyl methacrylate, polyethylene terephthalate, polyacetal, modified polyphenylene ether , Polybutylene terephthalate, high density polyethylene, ultra high molecular weight polyethylene, polyphenylene sulfide, polysulfone, low density polyethylene, polypropylene, polymethylpentene, polystyrene, syndiotactic polystyrene, liquid crystal polymer (LCP), ABS, polyimide, EPDM, silicone resin One or two or more thermoplastic resins such as polyarylate and fluororesin can be used.
If it is a thermoplastic elastomer, 1 type, or 2 or more types, such as a styrene type, an olefin type, a polyurethane type, a vinyl chloride type, a polyamide type, can be used. Moreover, a thermoplastic resin, a thermosetting resin, and crosslinked rubber powder can also be mixed 1 type, or 2 or more types.
In addition, in order to adjust the dynamic viscoelasticity and weight of conventionally known thermoplastic resins, graphite, kettin black, carbon black, talc, mica, montmorillonite, titanium oxide, fumed silica, zinc oxide, carbon fiber, carbonic acid Additives such as calcium, aluminum oxide, metal, fibrous potassium titanate, carbon nanotube, fullerene, protein powder, paraffin, process oil, and plasticizer can also be added.
Moreover, a thermoplastic resin, a thermosetting resin, crosslinked rubber powder, etc. can also be mixed 1 type (s) or 2 or more types.
For coloring, pigments, dyes, fluorescent brighteners, metal powders, and bubbles can be added.

  In the present invention, the hardness of the inner shell and the outer skin is, for example, preferably JIS-D hardness of 40 ° to 80 °, and more preferably 50 ° to 70 °.

In the present invention, the fitting surface is provided with a second gap that is continuous with the first gap on the opposing surface, and the resin that constitutes the skin enters the second gap from the first gap. It is preferable to further include a second fusion part for fusing at least a part of the fitting surface to each other.
According to this aspect, since the resin of the skin enters the second gap formed on the fitting surface together with the first gap formed on the facing surface, and a part of the fitting surface is fused, the inner shell The possibility of cracking is further reduced.

In the present invention, the inner shell part includes a pair of inner shell halves and a coupling ring disposed between the inner shell halves, and the contact surface between the inner shell half and the coupling ring. It is preferable that a fitting surface is formed, and the facing surface is formed between the inner shell halves.
According to this aspect, by using three parts, the joint portion becomes symmetrical, and the strength can be improved.

In the present invention, it is preferable that one of the opposing surfaces is formed with a small protrusion that protrudes with respect to the other of the opposing surfaces and secures the first gap.
According to this aspect, since the first gap having a predetermined height is uniformly ensured by the small protrusions, the reliability of the coupling strength of the opposing surface is increased and the quality is stabilized.

In the present invention, the inner shell is transparent or translucent, and the outer shell is opaque. The inner shell penetrates the outer shell and is spaced from each other in the diametrical direction. It is preferable that a pair of exposed portions are provided through which the light is emitted outward from the other when incident.
When external light is incident on the inside of the ball from one exposed portion, the light is emitted to the outside from the other exposed portion. Therefore, since the appearance of the ball is conspicuous, it is easy to search for the ball.

Principle of the invention:
Next, the principle of the present invention will be described with reference to FIG.
FIG. 5A shows a part of a conventional hollow ball. As shown in FIG. 5A, the joint surface 103 of the inner shell 101 is set in the radial direction R from the center of the ball. In such a case, when a large striking force is repeatedly applied to the ball, the entire ball is deformed, and a force acts in a direction in which the hemispheres 102 are separated from each other with the joint surface 103 as a boundary. That is, when the joint surface 103 extends in the radial direction R, the outer end portion 104 becomes the starting point of the separation, and separation between the hemispheres 102 (a tear at the joint surface 103) is likely to occur.

  On the other hand, as shown in FIG. 5B, when the outer end portion 204 of the joint surface 203 in the inner shell 201 extends in a direction approximate to the tangential direction X of the outer periphery of the inner shell 201, the ball has a large hitting force repeatedly. Is applied, the force acting in the direction in which the joint surfaces 203 of the inner shell 201 are separated from each other is dispersed, and the hemispheres 202 are not easily separated (the joint surface 203 is torn).

  Furthermore, in addition to the structure of the inner shell 201 described with reference to FIG. 5B, as shown in FIG. 5C, hemispherical bodies 302, 302 are provided with facing surfaces 306, 307 facing each other, and the resin constituting the skin 305 is indicated by diagonal lines. In this way, if the opposing surfaces 306 and 307 are set so as to enter the gap between the opposing surfaces 306 and 307 and the opposing surfaces 306 and 307 are fused together, the joining surface 303 is further less likely to be separated.

Hereinafter, an embodiment of a hollow ball according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the hollow ball is composed of an inner shell 1 in which three inner shell parts 2, 2, and 3 are joined at a joint 4, and an inner shell 1 that covers and covers one of the parts 2, 3. It consists of a skin 5 fused to the part. A spherical hollow portion S is formed in the inner shell 1. Each part 2, 2, 3 is transparent or translucent, and the skin 5 is opaque.

  Each of the parts 2 and 3 includes a pair of inner shell halves 2 and 2, and a coupling ring 3 that is disposed between the pair of inner shell halves 2 and 2 and fits into the inner shell half 2. .

  As shown in an enlarged view in FIG. 2, the inner shell 1 has first to third contacts in which the inner shell half 2 and the coupling ring 3 abut each other in the circumferential direction in the vicinity of the inner surface 35 of the inner shell 1. A contact surface A1 to A3, a facing surface C facing the inner shell halves 2 in a state of being spaced apart from each other in the circumferential direction in the vicinity of the outer surface 36 of the inner shell 1, and the first to third contact surfaces A1. -A3 and the said opposing surface C are connected, The inner shell half body 2 and the coupling ring 3 are provided with fitting surface B1-B5 which mutually fits along the circumferential direction.

  In the first to third contact surfaces A1 to A3, the pressure at the time of pressure molding is held by the skin 5, the first and second fusion portions D1 and D2, and the inner shell half 2 and the coupling ring 3 are in strong pressure contact with each other.

  In the first to third joint surfaces B1 to B3, the state of being pressed against each other by the elasticity of the resin during pressure molding is maintained even after molding, and the inner shell half 2 and the coupling ring 3 are not spaced from each other. In contact.

The first, second and fifth fitting surfaces B1, B2, B5 are substantially parallel to the tangential direction X.
The third fitting surface B3 and the fourth fitting surface B4 are slightly inclined with respect to the tangential direction X.
The inclination angle of each fitting surface B1 to B5 with respect to the tangent line of the inner surface 35 or the outer surface 36 is set in a range of 0 ° to 45 °.

The resin that constitutes the skin 5 enters the first gap D1 between the facing surfaces C, C of the pair of inner shell halves 2 so that the facing surface C of the inner shell half 2 and the skin 5 are separated. Are fused together.
That is, the first gap D1 of the inner shell half 2 has a first fusion part E1 in which the resin constituting the skin 5 enters the first gap D1 and the opposing surfaces C are fused to each other. Is formed.

A portion closer to the center of the ball than the first gap D1 of the inner shell half 2 is between the fourth fitting surface B4 of the inner shell half 2 and the fifth fitting surface B5 of the coupling ring 3. A second gap D2 is formed. The second second gap D2 is continuous with the first gap D1, and the resin constituting the outer skin 5 enters the second gap D2 from the first gap D1, so that the outer skin 5 And the fourth fitting surface B4 of the inner shell half 2 are fused to each other, and the skin 5 and the fifth fitting surface B5 are fused to each other.
That is, in the second gap D2 of the inner shell half 2, the resin constituting the outer skin 5 enters the second gap D2 from the first gap D1, and the fourth and fifth fitting surfaces B4, B4. A second fusion part E2 for fusing B5 (part of the fitting surface) to each other is formed.

  Here, as described in the above-mentioned principle, the first fused portion E1 and the second fused portion E2 are separated from each other by the inner shell half bodies 2 due to repeated large impact force applied to the ball. Disperse the force in the direction.

Hollow ball manufacturing method:
As shown in FIG. 3, a first hollow portion S <b> 1 is formed inside the inner shell half 2. On the other hand, a second hollow portion S2 is formed inside the coupling ring 3 at a position corresponding to the first hollow portion S1 of the pair of inner shell halves 2. Therefore, as shown in FIG. 1, when the inner shell half 2 and the coupling ring 3 are assembled to form the inner shell 1, a hollow portion S composed of the first hollow portion S1 and the second hollow portion S2 is formed therein. .

In the coupling ring 3 having an H-shaped cross section, a first convex portion 3a, a second concave portion 3b, and a third convex portion 3c are formed in order from the outer side to the inner side in the circumferential direction.
On the other hand, the inner shell half 2 is formed with a first concave portion 2a into which the first convex portion 3a of the coupling ring 3 is inserted, and a second convex portion 2b into which the second concave portion 3b of the coupling ring 3 is inserted. ing. The first concave portion 2 a is formed between the third convex portion 2 c on the outer surface 36 side of the inner shell half 2 and the second convex portion 2 b on the inner surface 35 side of the inner shell half 2.

  When the inner shell 1 (FIG. 1) is assembled, the first convex portion 3a of the coupling ring 3 is pushed into the first concave portion 2a of the inner shell half body 2, and the second convex portion 2b of the inner shell half body 2 is the coupling ring. It is pushed into the 2nd recessed part 3b formed between the 1st convex part 3a and the 3rd convex part 3c.

  As a result, the first engagement protrusion 31 formed on the outer peripheral surface end of the first protrusion 3 a of the coupling ring 3 and the second engagement formed on the third protrusion 2 c of the inner shell half 2. The mating protrusions 21 engage with each other as shown in FIG.

On the other hand, as shown in FIGS. 3, 4A, and 4B, the opposing surface C of each inner shell half 2 protrudes from the other opposing surface C so that the first gap D1 has a uniform height. A small projection 22 is formed integrally with the first projection. As shown in FIG. 4B, the small protrusions 22 are arranged on the opposing surface C of the inner shell half 2 at substantially equal intervals in the circumferential direction of the inner shell half 2.
When the inner shell 1 is assembled, the small protrusions 22 of both inner shell halves 2 shown in FIG. 3 are assembled so as not to collide with each other.

Thereafter, when the pair of inner shell halves 2 and 2 are pressed against the coupling ring 3 with the pressure at the time of molding, the small protrusions 22 are pressed against the opposing surface C, the small protrusions 22 are compressed, and the inner parts before molding are compressed. As shown in FIG. 1, the height H (FIG. 3) of the small protrusion 22 of the shell half 2 is compressed to the gap ΔH of the first gap D1.
Thus, by forming the small protrusions 22 integrally on the inner shell half 2 before molding, the height of the first gap D1 can be ensured to a uniform predetermined height.

After that, the molten resin forming the skin 5 is pumped into the mold, so that the resin of the skin 5 shown in FIG. 2 enters the second gap D2 from the first gap D1 to face the inner shell half 2. The surfaces C, the fourth fitting surface B4 of the inner shell half 2 and the fifth fitting surface B5 of the coupling ring 3 are fused.
On the other hand, when the inner shell 1 is assembled, the resin of the skin 5 is formed in the portion where the second engaging protrusion 21 of the inner shell half 2 and the first engaging protrusion 31 of the coupling ring 3 are engaged. The resin is blocked and the resin is prevented from entering the inner shell 1.
In this way, the resin of the skin 5 enters the first gap D1 and the second gap D2, and the first fusion part E1 and the second fusion part E2 are formed.

Here, the first engagement protrusion 31 of the coupling ring 3 is pressed toward the second engagement protrusion 21 side of the inner shell half 2 by the injection pressure, so that the first engagement protrusion The part 31 and the second engaging protrusion 21 are more firmly fixed.
Moreover, the resin interface of the 1st melt | fusion part E1 is strengthened by applying a pressure so that the opposing surfaces C of the inner shell half 2 may mutually approach with the said injection pressure.

  The height H of the small protrusion 22 shown in FIG. 3 is preferably set to about 1.5 mm to 2.5 mm, for example, and the height ΔH of the small protrusion 22 after molding shown in FIG. For example, it is preferable to be molded so as to be about 0.5 mm to 1.0 mm.

  As shown in FIG. 1, the upper and lower convex portions 25 of the inner shell half 2 may be exposed to the outer peripheral surface from between the outer skins 5 so as to be seen from the outer surface of the hollow ball. Light enters the hollow ball from one of the pair of convex portions 25 of the inner shell half 2 and the light is emitted from the other. Therefore, it is easy to find the ball because it stands out.

Further, it is not always necessary to provide the coupling ring 3, even if the first engagement protrusion 31, the first protrusion 3 a, the second recess 3 b, and the third protrusion 3 c are formed on one inner shell half 2. Good.
Furthermore, in the said Example, although the hollow ball was formed in two layers, the inner shell 1 and the outer skin 5, you may produce a hollow ball using resin of three or more layers.

  The hollow ball of the present invention can be used for competitions such as park golf and ground golf.

It is a schematic sectional drawing which shows the hollow ball concerning one Example of this invention. It is a schematic sectional drawing which expands and shows the junction part vicinity. It is the decomposed | disassembled schematic sectional drawing which shows the inner shell part before an assembly. 4A is a schematic cross-sectional view of the inner shell half before assembly, and FIG. 4B is a schematic bottom view of the inner shell half before assembly. It is a schematic sectional drawing which shows the principle of this invention.

Explanation of symbols

1: Inner shell 2: Inner shell half (inner shell parts)
3: Coupling ring (inner shell parts)
4: Joining part 5: Skin A1-A4: Contact surface B1-B5: Fitting surface C: Opposing surface 22: Small protrusion E1: First fusion part E2: Second fusion part

Claims (5)

In a resin-made hollow ball comprising an inner shell in which a plurality of inner shell parts are joined at a joint, and a skin that covers the joint and is fused to the parts,
The joint is
A contact surface where a plurality of parts contact each other in the circumferential direction in the vicinity of the inner surface of the inner shell;
In the vicinity of the outer surface of the inner shell, a plurality of parts face each other in a state of being separated from each other in the circumferential direction,
Connecting the contact surface and the facing surface, a fitting surface in which a plurality of parts are fitted together along the circumferential direction;
A resin-made hollow ball provided with a first fusion part in which the resin constituting the skin enters a first gap between the opposed surfaces and fuses the opposed surfaces together. In Claim 1, the fitting surface is provided with a second gap that continues to the first gap of the facing surface,
A resin-made hollow ball further comprising a second fusion part in which the resin constituting the skin enters the second gap from the first gap and fuses at least a part of the fitting surface to each other. . The inner shell part according to claim 1 or 2, comprising a pair of inner shell halves and a coupling ring disposed between the inner shell halves,
The contact surface and the fitting surface are formed between the inner shell half and the coupling ring,
A resin-made hollow ball in which the facing surfaces are formed between the inner shell halves.   4. The resin hollow ball according to claim 1, 2 or 3, wherein a small protrusion is formed on one of the opposing surfaces so as to protrude from the other of the opposing surfaces to secure the first gap. The inner shell according to any one of claims 1 to 4, wherein the inner shell is transparent or translucent, and the outer shell is opaque.
The inner shell is provided with a pair of exposed portions that penetrate the outer shell and are spaced from each other in the diametrical direction, and when external light is incident from one side, the light is emitted outward from the other.

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