JP5293338B2 - Table tennis racket - Google Patents

Description

  The present invention relates to a table tennis racket, and more particularly to a table tennis racket capable of achieving improvement in resilience performance.

  In general, a table tennis racket includes a blade having a hitting surface and a grip portion for a player to hold the racket, and the blade and the grip portion are integrally formed. The blade includes a plywood structure formed by laminating wood boards, a laminated plywood structure in which a special material such as FRP (Fiber Reinforced Plastics) is inserted between the wood layers, and a single wood board It has one of the three types of wood single-plate structures made of

  In such a conventional table tennis racket, a special material such as carbon is inserted into the laminated structure of the blade and the grip part, the number of laminated wooden boards constituting the blade is increased, and the thickness of the wooden board constituting the blade The resilience performance can be improved by changing the structure such as increasing the thickness.

  In the table tennis racket, various proposals have been made for the purpose of improving the resilience performance and easily achieving the characteristics desired by the player (see, for example, Patent Documents 1 and 2).

Japanese Patent Laid-Open No. 4-231080 Japanese Utility Model Publication No. 63-19081

  However, if a special material is inserted for the purpose of improving the resilience performance or a structure that increases the number of laminated wood plates or the thickness is adopted, there is a problem that the mass of the racket increases and the operability deteriorates. In addition, there is a problem that the resilience performance is not always sufficient only by forming the surface of the ball striking surface with FRP as in Patent Document 1.

  Accordingly, an object of the present invention is to provide a table tennis racket capable of achieving an improvement in resilience performance while suppressing an increase in mass.

The table tennis racket according to the present invention includes a blade having a hitting surface and a grip portion connected to the blade. The grip portion includes a main body portion that is formed of an integral FRP and has a hollow portion. The blade is composed of an integral FRP. The blade is disposed along the ball striking surface, and is composed of a first reinforcing layer made of FRP, a second reinforcing layer made of FRP and made of FRP, a first reinforcing layer, and a second reinforcing layer. And a connecting portion made of FRP. A closed space closed by the first reinforcing layer, the second reinforcing layer, and the connection portion is formed. A protrusion is formed on at least one of the blade and the main body of the grip portion, and the blade on which the protrusion is formed or a blade different from the main body and the other of the main body is fitted into the protrusion. A concavity is formed.

Preferably, the table tennis racket further includes a filler filling between the first reinforcing layer and the second reinforcing layer, and the closed space is filled with the filler.

  In the table tennis racket, preferably, a high-rigidity portion having a higher rigidity than other regions of the blade is formed in a region where the blade and the grip portion are connected. Then, the antinodes of the natural out-of-plane bending natural vibration of the racket are located in the high-rigidity portion.

  In the table tennis racket of the present invention, the blade includes a first reinforcing layer and a second reinforcing layer made of FRP, and the first reinforcing layer and the second reinforcing layer are connected by a connecting portion made of FRP. Thereby, the rigidity of a racket improves remarkably and the improvement of resilience performance can be achieved, suppressing the increase in mass.

It is a schematic perspective view which shows the external appearance of a shake hand type racket. It is a schematic sectional drawing which shows the cross section along line segment II-II of FIG. It is the schematic which shows the structure of the braid | blade blade. It is the schematic which shows the connection state of a braid | blade and a grip part. It is a schematic sectional drawing which shows the cross section along the line segment VV of FIG. It is a schematic sectional drawing which shows the cross section along line segment VI-VI of FIG. It is a schematic sectional drawing which shows the connection state of a braid | blade and a grip part. FIG. 6 is a schematic diagram showing a structure of a blade in a second embodiment. FIG. 10 is a schematic diagram showing a connection state between a blade and a grip portion in a third embodiment. It is a schematic perspective view which shows the external appearance of a pen holder type racket. It is the schematic which shows the structure of the braid | blade blade. It is the schematic which shows the connection state of a braid | blade and a grip part. It is the schematic which shows the connection state of a braid | blade and a grip part.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

(Embodiment 1)
First, Embodiment 1 which is one embodiment of the present invention will be described. Referring to FIG. 1, a shake hand type racket 1 which is a table tennis racket in Embodiment 1 includes a blade 10 having a hitting surface 10 </ b> A and a grip portion 20 connected to the blade 10. Further, referring to FIGS. 1 and 2, the blade 10 is disposed along the ball striking face 10A and is arranged along the first reinforcing layer 11 made of FRP and the first reinforcing layer 11 and made of FRP. 2 reinforcement layer 12, the 1st reinforcement layer 11, and the 2nd reinforcement layer 12 are connected, and the connection part 13 which consists of FRP is included. Thereby, while the increase in the mass of the racket 1 is suppressed, the strength is improved, the rigidity, particularly the bending rigidity and the torsional rigidity are remarkably improved, and the resilience performance is improved.

  More specifically, each of the first reinforcing layer 11 and the second reinforcing layer 12 includes a ball striking surface 10A. When the racket 1 is used, a rubber (not shown) is pasted on the ball striking surface 10A. . The first reinforcing layer 11, the second reinforcing layer 12, and the connection portion 13 may be prepared and joined, but in the present embodiment, by being integrally formed, a seamless integrated structure is obtained. It has become. Thereby, the manufacturing process of the racket 1 is simplified, and high strength and rigidity are ensured.

  In addition, the connecting portion 13 may be arranged at any position as long as it connects the first reinforcing layer 11 and the second reinforcing layer 12, but in the present embodiment, the first reinforcing layer 11 and the first reinforcing layer 11 are arranged. 2 It arrange | positions so that the outer periphery of the reinforcement | strengthening layer 12 may be connected. As a result, the blade 10 is formed with a closed space 10 </ b> B closed by the first reinforcing layer 11, the second reinforcing layer 12, and the connection portion 13. By adopting such a structure, the weight of the blade 10 is reduced and the rigidity is further improved.

  Here, while reducing the thickness of the first reinforcing layer 11 and the second reinforcing layer 12 (the vertical width in FIG. 2), the width of the connecting portion 13 in the direction along the ball striking face 10A (the horizontal direction in FIG. 2). It is preferable to adopt a structure that ensures the required rigidity by increasing the width. More specifically, the thickness of the first reinforcing layer 11 and the second reinforcing layer 12 is preferably thinner than the width of the connecting portion 13 in the direction along the ball striking face 10A. Thereby, the improvement of resilience performance can be achieved, aiming at weight reduction of the racket 1. FIG.

  Furthermore, the space between the first reinforcing layer 11 and the second reinforcing layer 12 may be a cavity. However, referring to FIG. 2 and FIG. 3, the space, that is, the closed space 10B is the present embodiment. Is filled with a filler 14. Thereby, the resilience performance of the racket 1 can be adjusted.

  Further, the blade 10 and the grip part 20 may have a seamless integrated structure, but in the present embodiment, as shown in FIG. 4, the blade 10 and the grip part 20 are prepared separately, It has a joined structure. More specifically, referring to FIGS. 4 and 5, the blade 10 constituted by an integral FRP is formed with a protruding portion 10 </ b> C that protrudes from a part of the outer peripheral surface in a direction along the hitting surface 10 </ b> A. ing. On the other hand, referring to FIG. 6, grip portion 20 is formed of an integral FRP, and is disposed in a pair so as to sandwich main body portion 21 having hollow portion 20 </ b> B and main body portion 21, for example, from PU (polyurethane) foam. And a grip portion 25. Moreover, although the hollow part 20B may be a cavity, it is filled with the filler 24 in the present embodiment. Further, the main body portion 21 is formed with a recess 20 </ b> C having a shape that fits into the protruding portion 10 </ b> C of the blade 10. Then, referring to FIG. 7, the protrusion 10 </ b> C of the blade 10 and the recess 20 </ b> C of the grip 20 are fitted together, so that the blade 10 and the grip 20 are connected. Thereby, manufacture of the racket 1 becomes easy. The fillers 14 and 24 may be made of a resin foam such as a hard plastic closed cell foam or a PET (Poly Ethylene Terephthalate) foam.

  Here, referring to FIG. 7, the two members overlap each other in a region where the blade 10 and the grip portion 20 are connected by fitting the protruding portion 10 </ b> C of the blade 10 and the concave portion 20 </ b> C of the grip portion 20. Thus, the high-rigidity portion 1A having higher rigidity than the other region of the blade 10 is obtained. The antinode α of the bending natural vibration out of the plane of the racket 1 is located in the highly rigid portion 1A. By adopting such a structure, it is possible to reduce the movement of the antinode α of the out-of-plane primary bending natural vibration, and the resilience performance of the racket 1 is improved.

  Here, the length of the racket 1 in the longitudinal direction of the grip portion 20 (left and right direction in FIG. 7) is generally about 240 mm to 265 mm. In this case, in this direction, the highly rigid portion 1A is 50 mm from the antinode α of the out-of-plane primary bending natural vibration toward the grip portion 20 side (right side in FIG. 7) and the blade 10 side (left side in FIG. 7). The following regions are preferable. Thereby, the resilience performance of the racket 1 can be improved while suppressing an increase in the mass of the racket 1. Further, the high-rigidity portion 1A can be an area of 20 mm or less from the antinodes of the out-of-plane primary bending natural vibration toward the grip portion 20 side and the blade 10 side. Thereby, the increase in the mass of the racket 1 can be further suppressed while sufficiently improving the resilience performance of the racket 1.

  In addition, the antinode 1 of the out-of-plane primary bending natural vibration can be determined by performing frequency measurement on the single racket 1 without attaching rubber to the racket 1.

  Next, an example of a method for manufacturing the racket 1 will be described. First, a core material made of a foamed resin molded into the approximate shape of the blade 10 is prepared, and a sheet-like prepreg in which carbon fibers are added as reinforcing fibers to a thermosetting resin, for example, around the core material. A molded body is produced by winding only an amount. Then, the said molded object is arrange | positioned in the cavity of the metal mold | die which has a cavity corresponding to the shape of the desired braid | blade 10, and it clamps. And when the said molded object in a metal mold | die is heated, while the foamed resin which comprises a core material expands, the external shape of a molded object is restrained by the metal mold | die which has a cavity corresponding to the shape of the braid | blade 10. . Moreover, the thermosetting resin which comprises a prepreg hardens | cures by heating. Thereby, the blade 10 in which the closed space 10B is filled with the foamed resin as the filler 14 is completed. On the other hand, the grip part 20 is prepared by producing the main body part 21 in which the hollow part 20B is filled with the filler 24 and forming the grip part 25 on the main body part 21 in the same manner as the blade 10 described above. Can do. For example, the grip portion 25 is formed by placing the main body portion 21 in a cavity of a mold having a cavity corresponding to the shape of the desired grip portion 25 and heating the PU foaming agent while supplying the PU foaming agent into the cavity. It can be carried out by foaming and curing the agent. Then, the blade 10 and the grip portion 20 are connected by fitting the protrusion 10C of the blade 10 and the recess 20C of the grip portion 20 and bonding them. The racket 1 in the present embodiment is completed by the above procedure.

  Note that the racket 1 having a hollow structure in which the closed space 10B and the hollow portion 20B are not filled with the filler is manufactured instead of the solid structure in which the closed space 10B and the hollow portion 20B are filled with the filler as described above. In this case, the following procedure can be adopted. That is, first, instead of the core material made of foamed resin, a core material made of a nylon tube is prepared, and the molded body is wound by winding a prepreg similar to the above case around the core material by a desired amount. Make it. Thereafter, as in the case described above, the molded body is placed in a mold and clamped, and then the molded body is heated while injecting air into the core material to expand the core material. As a result, the outer shape of the molded body is constrained by the mold, and the thermosetting resin constituting the prepreg is cured. Thereby, the main body part 21 of the braid | blade 10 and the grip part 20 which have a hollow structure can be prepared. And the racket 1 can be manufactured by connecting the prepared braid | blade 10 and the grip part 20 similarly to the above-mentioned case.

(Embodiment 2)
Next, Embodiment 2 which is another embodiment of the present invention will be described with reference to FIG. Here, FIG. 8 shows a state where the first reinforcing layer 11 is removed from the blade 10. The racket 1 according to the second embodiment basically has the same configuration as that of the racket 1 according to the first embodiment, and has the same effects and can be manufactured in the same manner. However, the racket 1 according to the second embodiment is different from the first embodiment in the structure of the blade 10.

  That is, referring to FIG. 8, connection portion 13 of blade 10 of racket 1 in Embodiment 2 includes outer peripheral connection portion 13 </ b> A and transverse connection portion 13 </ b> B. More specifically, the outer peripheral connection portion 13A is arranged so as to connect the outer peripheries of the first reinforcing layer 11 and the second reinforcing layer 12 as in the case of the first embodiment. On the other hand, the transverse connecting portion 13B extends so as to connect the outer peripheral connecting portions 13A facing each other, and connects the first reinforcing layer 11 and the second reinforcing layer 12. In the present embodiment, two transverse connecting portions 13B are formed and cross each other.

  By adopting such a structure, the rigidity of the blade 10 is further improved. As a result, the racket 1 in the present embodiment is a table tennis racket with improved resilience performance.

(Embodiment 3)
Next, Embodiment 3 which is still another embodiment of the present invention will be described. The racket 1 according to the third embodiment basically has the same configuration as that of the racket 1 according to the first embodiment, and has the same effects and can be manufactured in the same manner. However, the racket 1 according to the third embodiment is different from the first embodiment in the connection structure between the blade 10 and the grip portion 20.

  Specifically, referring to FIGS. 9 and 4, protrusion 10 </ b> C of blade 10 in Embodiment 3 includes a belt-like protrusion 10 </ b> D that protrudes in a belt shape. And the recessed part 20C corresponding to the said strip | belt-shaped protrusion part 10D is formed in the grip part 20. As shown in FIG. As a result, in a state where the blade 10 and the grip part 20 are connected, the belt-like protrusion 10D reaches the inside of the rod-like part 20D of the grip part 20. Thereby, the area | region where the braid | blade 10 and the grip part 20 overlap becomes large, and the rigidity of the racket 1 further improves.

(Embodiment 4)
Next, a fourth embodiment which is still another embodiment of the present invention will be described. The racket 1 according to the fourth embodiment basically has the same configuration as that of the racket 1 according to the first embodiment, and has the same effects and can be manufactured in the same manner. However, referring to FIGS. 10 to 12, racket 1 in the fourth embodiment is different from the first embodiment in that it is a pen holder type. In the blade 10 of the racket 1 in the present embodiment, as in the first embodiment, the first reinforcing layer 11 and the second reinforcing layer 12 may be connected to each other at the outer peripheral portion by the connecting portion 13. Similarly to the second embodiment, a transverse connecting portion 13B may be further formed. Further, the connection structure between the blade 10 and the grip portion 20 in the present embodiment may be the same as that of the first embodiment as shown in FIG. 12, or the same as that of the third embodiment as shown in FIG. Alternatively, a structure in which the belt-like protruding portion 10D reaches the inside of the rod-like portion 20D of the grip portion 20 may be employed.

  In the above embodiment, a shake hand type and pen holder type racket have been described as an example of a table tennis racket, but the table tennis racket of the present invention is not limited thereto, for example, a Chinese pen holder type, a rotor type, etc. It can also be applied to other types of rackets.

  The embodiment disclosed this time is to be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The table tennis racket of the present invention can be particularly advantageously applied to a table tennis racket that requires improvement in resilience performance.

  1 racket, 1A high rigidity portion, 10 blade, 10A hitting surface, 10B closed space, 10C protrusion, 10D belt-like protrusion, 11 first reinforcing layer, 12 second reinforcing layer, 13 connection portion, 13A outer peripheral connection portion, 13B Cross connection part, 14 filler, 20 grip part, 20B hollow part, 20C recessed part, 20D rod-like part, 21 body part, 24 filler, 25 grip part.

Claims (3)

A blade having a ball striking surface;
A grip portion connected to the blade,
The grip portion includes a main body portion having a hollow portion made of an integral FRP,
The blade is composed of an integral FRP,
A first reinforcing layer disposed along the ball striking surface and made of FRP;
A second reinforcing layer disposed along the first reinforcing layer and made of FRP;
And connecting said said first reinforcing layer second reinforcing layer, seen including a connecting portion made of FRP,
A closed space closed by the first reinforcing layer, the second reinforcing layer, and the connecting portion is formed;
A protrusion is formed on at least one of the blade and the main body,
A table tennis racket in which a recess that fits into the protrusion is formed on the blade on which the protrusion is formed or on the other of the blade and the main body different from the main body . A filler filling the space between the first reinforcing layer and the second reinforcing layer;
The table tennis racket according to claim 1, wherein the closed space is filled with the filler. In the region where the blade and the grip portion are connected, a highly rigid portion having a higher rigidity than other regions of the blade is formed,
The racket for table tennis according to claim 1 or 2, wherein an antinode of the natural bending of the racket out of the plane is located in the high-rigidity portion.

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