JP2006341072A - Bat for baseball or softball, and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To offer a bat which is capable of extending a carry further than a conventional type bat. <P>SOLUTION: The metal or wooden bat for baseball or softball 101 specially is formed of its axial cross section of a cylindrical ball hitting part 103 of the bat 101 not including the tapered portion 104 to have a plurality of grooves consisting of concave troughs 108 and convex projections 107 placed side by side in parallel around the periphery of the surface of the bat 101, to shape the convex projections in round and curved forms outward, and is covered the convex and concave grooves with the cylindrical sheet made of polyurethane elastomer etc; a manufacturing process of the metal bat for baseball or softball manufactured by lathe working using roller on the surface of the cylindrical ball hitting part of the bat not including the tapered portion. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a baseball or softball butter capable of extending a flight distance and a method of manufacturing the same.

  For baseball and softball, bats with greater distance are attractive. For example, many knocks are repeated for catching practice, but when flying the ball to the outfield, the flying distance must be given. As such a soft baseball knock bat, at least one of the teams, A flying bat is desired.

  The bat as used in the present invention is not limited to a metal bat made of an aluminum alloy, but also includes a bat made of a material that is easy to process and a synthetic resin material such as FRP containing carbon fiber. The bat includes a tip portion, a hitting ball portion, a tapered portion, and a grip portion. The present invention relates to an improvement in a parallel hitting ball portion having the largest diameter among them.

In order to increase the flight distance of the hit ball, it is necessary to increase the rebound characteristic value of the bat by reducing the decrease in the speed of the bat at the time of the collision. It has been known for a long time to be small. Therefore, as a means for reducing the deformation of the ball at the time of hitting, a prior art for covering the surface of the bat with an elastic body has been disclosed (for example, Patent Document 1).
JP 2003-019236 A

At the time of hitting, the ball is deformed by surface contact with the bat surface. Therefore, reducing the contact area of the ball at the time of hitting is also a means for reducing the deformation of the ball. Therefore, it is conceivable that the hitting surface of the bat is made uneven. Although it is a case of a wooden bat, there exists a prior art that an unevenness | corrugation is formed in an outer peripheral surface by compression processing (for example, patent document 2, patent document 3).
Japanese Patent Publication No.33-001279 JP 2002-282405 A

The unevenness of the bat surface described in Patent Document 2 and Patent Document 3 is characterized by being irregularly formed. On the other hand, there is a prior art in which regular irregularities are formed in the vertical direction (for example, Patent Document 4). However, Patent Document 4 does not disclose a manufacturing method, and the bat described in Patent Document 4 does not conform to the rules for baseball or softball equipment.
Japanese Utility Model Publication No. 36-027915

In order to reduce the probability that the hit ball becomes a foul or goro, it is considered that unevenness in the lateral direction may be good. Although there is a groove, there is a prior art in which regular irregularities are formed in the lateral direction (for example, Patent Document 5).
Japanese Utility Model Publication No. 30-018934

However, in the above document, the unevenness is spiral. In this regard, there is a prior art in which an annular groove is formed (for example, Patent Document 6).
Japanese Utility Model Publication No. 53-085255

The thing of this literature 5 has provided the unevenness | corrugation of the bat also in the taper part. However, if the aim is to extend the flight distance, it should be excluded from the assumption that the ball is hit by the tapered portion, and the unevenness may be only the parallel hitting ball portion. In Reference 6, the surface of the convex portion between the concave grooves is made flat and smooth. This is not an effective means of reducing the deformation of the flying ball because the area that the ball contacts when hitting cannot be made too small.
Moreover, as for the bat described in the literature 5 and the literature 6, as for all, the uneven | corrugated | grooved part has appeared on the bat surface, and has deviated from the specification as a tool of baseball and a softball.

  In view of the above circumstances, the present invention provides a bat that extends the hitting distance of the hit ball as compared with the conventional one, conforms to the standards of baseball and softball equipment, and can fly the ball forward, and a method for manufacturing the same. This is the issue.

  In order to achieve the above-mentioned object, the present invention provides a cylindrical cross-sectional shape of a cylindrical hitting ball portion that does not include a tapered portion of the bat, a valley having a concave surface and a mountain of a convex portion on the circumference of the bat. Therefore, rubber, resin, and leather that are provided in a plurality of rows alternately and in parallel, and that are formed into a cylindrical shape so that the convex and concave portions are formed in a curved surface that is rounded outward and the concave and convex portions do not appear on the bat surface. A baseball or softball bat made of metal, made of FRP containing a metal, wooden or carbon fiber or having a bat surface coated with a sheet such as, or the like.

  In addition, a plurality of concave valleys and convex peaks are alternately provided in parallel on the bat surface of the cylindrical hitting ball portion not including the taper portion by cutting with a lathe using a total shape tool, and the convex shape This constitutes a method for manufacturing a wooden baseball or softball bat having a curved surface rounded outward.

  Further, in the axial direction of the bat of the cylindrical hitting ball portion not including the tapered portion, a plurality of concave valleys and convex peaks are alternately provided in parallel by machining with a lathe using a spatula or a roller, and the convex The manufacturing method of the metal baseball or softball bat which formed the shape part in the curved surface rounded toward the outer side is comprised.

  Furthermore, a cylindrical striking ball portion not including the taper portion of the bat is provided with a plurality of strips having a concave portion and a convex portion on the surface alternately in parallel, and the convex portion is rounded outward. A method for manufacturing a baseball or softball bat made of synthetic resin made of carbon fiber-containing FRP or the like manufactured by using a mold is used to form a curved surface.

  In the baseball or softball bat of the present invention, the curved surface of the concavo-convex portion is provided in the hit ball portion, so that the area in contact with the ball or the area repelling the ball at the time of hitting is close to the linear contact, and the contact area is small. Therefore, the deformation of the hit ball is reduced and the flight distance can be extended.

  Also, since the contact area between the bat and the ball is reduced, the frictional force between the ball and the bat at the time of hitting is also reduced, and if the bat does not hit the center of the hole, the degree of slippage and fouling is increased. However, as in the present invention, by covering the bat surface with a sheet of rubber, resin, leather, etc. processed into a cylindrical shape, the reduction in frictional force between the ball and the bat is eliminated, and the ball is moved forward. The effect of skipping was obtained.

  Since the baseball or softball bat of the present invention is composed of a single material, there is no fear of peeling, and the cross-sectional shape in the axial direction of the bat of the cylindrical hitting ball portion not including the taper portion of the bat has a surface By providing a large number of concave and convex valleys and convex ridges alternately in parallel along the circumference of the bat, the bat has a durability that is about 2-3 times stronger than the conventional bat. .

  In the baseball or softball bat of the present invention, since the concavo-convex portion is buried in the rubber, resin or leather sheet attached to the hitting portion of the bat, there is no sense of incongruity, and the standard for baseball or softball equipment It can also be used to fly the ball forward.

  The baseball or softball bat of the present invention can be easily processed at low cost if it is made of wood or synthetic resin.

  Hereinafter, the bat of the present invention will be described in detail with reference to examples.

  FIG. 1 is a front view including a virtual ball at the time of hitting a soft baseball knock bat made of the wooden material of the present invention. FIG. 2 is a plan view showing the contact area of the ball at the time of hitting, in which the product of the present invention is compared with the conventional product.

  The bat 1 includes a tip portion 2, a hit ball portion 3, a taper portion 4, and a grip portion 5. The hitting ball portion 3 that does not include the taper portion 4 is a large-diameter portion that is hit when the ball is rebounded far away. The bat 1 of this embodiment has a maximum outer diameter of the hitting ball portion 3 of 68 mmΦ.

  On the surface of the hitting ball portion 3, a large number of uneven portions 6... 6 in the transverse diameter direction are provided. In the case of this embodiment, 10 are formed. The concavo-convex portions 6... 6 are formed with a curved cross-sectional shape. Accordingly, the curved surface is a symmetrically rounded curved surface like a sine curve in the vertical direction.

  In the concavo-convex portions 6... 6 of the present embodiment, the intervals between the peaks and peaks 7... 7 and the valleys and valleys 8. Therefore, the length of the concavo-convex portions 6 ... 6 is 15 cm. The depths 9 ... 9 of the valleys 8 ... 8 are 3 mm. The interval between the valleys and the valleys 8... 8 is preferably 10 to 20 mm.

  FIG. 1 shows a virtual sphere 10 of a ball that is depressed when hit. The ball is usually about 7 cm in diameter, and depending on the hardness, in the present example, the deformation was an area of about 4 cm in length on average. Therefore, the contact with the ball 10 at the time of hitting is usually a line contact only at the top of the two peaks of the mountain 7a and the mountain 7b. In addition, at most, the contact is limited to five mountains.

  Next, the contact area (%) was compared with the conventional product bat having parallel hitting portions. FIG. 2 shows an example of the contact area% obtained by photographing the side surface at the moment of hitting with a high-speed camera (not shown) and enlarging and analyzing it on a plane. In FIG. 2, 11 is a sphere, and the conventional bat has a circular surface contact with a large contact area A. On the other hand, in the bat of the present invention, only the tops of the convex portions are in contact with each other, so that the contact areas 12, 12 are in the form of two rod-like linear contacts. Therefore, the contact area of the conventional product bat is set to 100%, the contact area% of the product of the present invention is calculated, and an actual hitting test is also performed. Table 1 shows the results. In addition, the measured value of the flight distance is an average value of 10 hits.

  The bat 1 of the present invention has a contact area reduced to about ３ and a flight distance improved by about 18% compared to the conventional bat.

  FIG. 3 is a cross-sectional view of a soft baseball bat made of the aluminum alloy of the present invention.

  The bat 101 includes a tip portion 102, a hit ball portion 103, a tapered portion 104, and a grip portion 105. The hitting ball portion 103 that does not include the tapered portion 104 is a large-diameter portion that is hit when the ball is rebounded far away. The bat 101 of this embodiment has a maximum outer diameter of the hitting ball portion 103 of 68 mmΦ.

  A tube 113 made of a polyurethane elastomer (not including foam) having a thickness of 1.0 mm is covered as a coating layer on the surface of the hitting portion 103 of the concavo-convex portion, and the outer diameter is tapered with the tip portion 102. It is the same as the end diameter of the portion 104 and has a smooth surface with no step. Inside the tube 113, there are provided a large number of concave and convex portions 106... 106 in the transverse diameter direction, one step below the outer diameter of 68 mm. In the case of this embodiment, 10 are formed. The concavo-convex portions 106... 106 are formed in a curved surface shape having a circumference having the same radius. Accordingly, the upper and lower curved surfaces are rounded curved surfaces such as sine curves. The coating layer is preferably a rubber or resin cylindrical sheet having a thickness of 0.5 to 3.0 mm.

  The uneven portions 106... 106 of this embodiment are formed such that the intervals between the peaks and peaks 107... 107 and the valleys and valleys 108. Therefore, the length 109 of the concavo-convex portions 106... 106 is 20 cm. The depth 109 ... 109 of the valleys 108 ... 108 is 3 mm. The interval between the valleys and the valleys 8... 8 is preferably 10 to 20 mm.

  FIG. 3 shows a virtual sphere 110 of a ball that is depressed when hit. The ball is usually about 7 cm in diameter and varies depending on the hardness, but in this example, the deformation was an area of about 4 cm length on average. Therefore, the contact with the ball 110 at the time of hitting is a linear contact only at the top of the two peaks of the normal mountain 107a and the mountain 107b. Usually, the contact is limited to at most five peaks.

  Next, the contact area% was compared with the conventional product bat having a parallel hitting portion. Since the contact area% is the same method as the measurement method of the contact area of Example 1, details are omitted. Although the contact area is not shown, the deformation of the sphere is repelled by contacting the tops of the peaks 107a and 107b of the concavo-convex portion 106 inside the surface, not the flexible coating layer 113. Table 2 shows the results of actual hitting tests. In addition, the measured value of the flight distance is an average value of 10 hits. However, since the data of the conventional product is shown in Table 1, it is omitted.

  In the bat 1 of the present invention, the contact area was reduced to about 1/3 and the flight distance was improved by about 17% compared to the conventional product.

  FIG. 4 is a perspective view of the soft baseball bat made of the wooden material of the present invention manufactured by cutting with a lathe using a full-length tool.

  As shown in FIG. 4, the bat of the present invention can be manufactured by cutting with a lathe using a contour cutting tool 50, that is, a so-called general cutting tool 51. If the rounded tip of the bite 51 is selected, the cross-sectional shape in the axial direction of the circumferential hitting ball portion of the bat is changed alternately with the groove of the concave portion and the ridge of the convex portion along the circumference of the bat. A plurality of strips can be provided in parallel, and the convex strips can be formed into curved surfaces that are rounded toward the outside.

  FIG. 5 is a perspective view of manufacturing a soft baseball bat made of the aluminum alloy of the present invention by lathe processing using a roller.

The bat of the present invention can be manufactured by machining with a lathe using a roller 151 of a roller tool 150 as shown in FIG. If the roller 151 with a rounded tip is selected, the cross-sectional shape in the axial direction of the circumferential hitting ball portion of the bat is changed alternately with the groove of the concave portion and the ridge of the convex portion along the circumference of the bat. A plurality of strips can be provided in parallel, and the convex strip can be formed into a curved surface that is rounded toward the outside.
The concavo-convex portion can also be manufactured by machining with a lathe using a spatula of a spatula tool.

  FIG. 6 is a front view showing an embodiment of a soft baseball bat made of a synthetic resin material of FRP containing carbon fiber according to the present invention.

  The hitting ball portion 203 of the bat 201 is provided with a number of uneven portions 206... 206 in the vertical direction. In the case of a bat made of synthetic resin, this is formed by a molding process using a mold, so that vertical bars can be easily formed. And the cylindrical sheet | seat 213 made from rubber | gum or resin is covered by the surface of the uneven | corrugated-shaped part 206 ... 206 as a coating layer.

  The bat of the present invention can be widely used as a baseball bat or softball bat including a knock.

It is a front view including the virtual ball at the time of hitting of the soft baseball knock bat made of the wooden material of the present invention. It is a top view which shows the contact area of the ball | bowl at the time of hitting the ball which contrasted this invention product and the conventional product bat. It is sectional drawing of the soft baseball bat which consists of an aluminum alloy of this invention. It is a perspective view which manufactures the soft baseball bat which consists of a wooden material of the present invention by cutting with a lathe using a total form bite. It is a perspective view which manufactures the soft baseball bat which consists of an aluminum alloy of this invention by a lathe process using a roller. It is a front view which shows the soft baseball bat which consists of synthetic resin raw materials, such as FRP containing the carbon fiber of this invention.

Explanation of symbols

1,101,201 Bat 2,102
Bat tip 3,103,203 Bat hitting ball 4,104 Bat taper 5,105
Bat grip part 6,106,206 Concave and convex part 7,7a, 7b
Crests 107, 107a, 107b Crests 8,108
Concave and convex valleys 9,109
Unevenness depth 10,110
Virtual ball to hit 11
Sphere 12
Contact area 113,213
Covering layer 50
Cutting tool 51
Total Byte 150
Roller tool 151
Laura A
Conventional product contact area

Claims (7)

  A cross-sectional shape in the axial direction of the bat of the cylindrical hitting ball portion not including the taper portion of the bat, a plurality of ridges are provided alternately in parallel along the circumference of the bat along the valley of the concave portion and the convex portion of the bat, and The convex portion is formed into a curved surface that is rounded outward, and the bat surface is covered with a sheet of rubber, resin, leather, or the like that is processed into a cylindrical shape so that the concave and convex portion does not appear on the bat surface. A baseball or softball bat made of FRP containing metal, wood or carbon fiber.   The baseball or softball bat according to claim 1, wherein the concave and convex portions are spaced at intervals of 5 to 20 mm, and the convex portions that come into contact with the ball at the time of hitting are two to five.   The baseball or softball bat according to claim 1, wherein the baseball bat is used for knocking.   The baseball according to any one of claims 1 to 3, wherein a cylindrical sheet or net made of rubber, resin, or leather having a thickness of 0.5 to 3.0 mm is covered on an outer peripheral surface of the uneven portion. Or softball bat.   On the bat surface of the cylindrical hitting ball portion not including the taper portion, a plurality of concave valleys and convex peaks are alternately provided in parallel by cutting with a lathe using a general cutting tool, and the convex portions are provided. A method of manufacturing a wooden baseball or softball bat, characterized by forming a curved surface rounded outward.   A method for manufacturing a metal baseball or softball bat, wherein the bat surface of a cylindrical hitting ball portion not including a taper portion is manufactured by a lathe using a spatula or a roller.   A cylindrical hitting ball portion that does not include the taper portion of the bat has a curved surface in which a plurality of concave and convex valleys and convex ridges are alternately provided in parallel, and the convex portion is rounded outward. A method for producing a baseball or softball bat made of synthetic resin made of carbon fiber-containing FRP or the like, characterized in that the formation is produced by a mold.

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