JPS6034301Y2 - FRP butt - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement of an FRP bat.

Conventionally, bats for baseball and softball can be broadly categorized into wooden, metal, FRP, etc., but since wooden bats are made of natural materials, they tend to vary in material quality.
It has disadvantages such as poor yield and long drying steps.

With metal bats, the bottom shape of metal pipes of the same diameter is shaped into the bat shape by swaging, and as the wall thickness becomes uneven, the center of gravity shifts closer to the grip, resulting in poor balance and making it difficult to bat using the weight of the head. had the disadvantages of being unsuitable.

Various configurations of FRP bats have been tried with the aim of producing bats that have sufficient strength in the grip and ball hitting areas, have little variation in quality, and are well-balanced. In consideration of balance, it has become common to use a lightweight core material and form an FRP layer as an outer layer.

As a lightweight core material, wood with low specific gravity such as magnolia,
Alternatively, foamed synthetic resin core materials, fiber-reinforced foamed synthetic resin core materials with reinforcing fibers interposed over the entire length, and the like are already in use.

However, even FRP bats using these conventional core materials have the following problems.

In other words, since wood with low specific gravity such as magnolia is a natural material, it is difficult to make the quality uniform, so the finished FR
There was a drawback that the weight and strength of P bats varied.

Next, in the case of a foamed synthetic resin core material, since the bending rigidity of the grip part is low, when forming the FRP layer, tension is applied to the reinforcing fibers and the fibers are wound at an angle using the filament winding method (FFW method). (abbreviated as ) cannot be used to manufacture bats.

Therefore, a method is used in which prepreg glass cloth or the like is wrapped around a core material and molded using a mold. However, since the shape of the bat is significantly different between the ball hitting part and the grip part, wrinkles and air bubbles may occur during wrapping. However, due to the formation of non-glue areas, the strength of the FRP layer itself tends to decrease significantly, and the bat itself has disadvantages such as poor durability.

On the other hand, in the case of a foamed synthetic resin core material reinforced with reinforcing fibers over the entire length of the bat, the bending rigidity of the grip and ball-hitting parts is sufficient, but the compressive strength of the ball-hitting parts tends to decrease, and the FRP layer is formed. The matrix resin used for this purpose permeates through capillary action into the voids between the reinforcing fibers and the saturated synthetic resin, which have holes at both ends and the entire circumference of the core material. This method had drawbacks such as a decrease in yield and an increase in the amount of matrix resin consumed.

Furthermore, if the above-mentioned core material is used and the FRP layer forming the outer shell is molded only from glass fiber as in the past, the bending rigidity of the grip will be small and the bat itself will be easily bent, making it difficult to hit. If the ball hits an off-center spot, the amplitude increases, causing discomfort in the hands such as numbness, and the bat itself tends to bend, resulting in poor ball flight.

In view of these drawbacks of conventional products, the present invention eliminates variations in quality, is strong in strength, has good balance, has excellent repulsion, and has an F that does not resonate in the hand even when the ball is hit off the batting center.
It was made for the purpose of supplying bats made of RP.

To explain the present invention based on the drawings, as shown in FIGS. 4 to 6, reinforcing fibers 10 mainly consisting of rovings made of glass fibers, carbon fibers, etc. are wound into a roll shape and interposed in a portion corresponding to the grip. A straight ply layer 6 in which glass fiber roving yarns are arranged along the entire length of the bat is formed on the outer circumferential surface of the foamed synthetic resin core material 5 which is formed into a bat shape. It has an angle ply layer 7 made of carbon fibers arranged at an angle with respect to the angle ply layer 7, and an angle ply layer 8 made of glass fibers is further formed on the angle ply layer only at a portion corresponding to the bat hitting part. This is an FRP bat with a unique structure.

In the FRP bat of the present invention, reinforcing fibers 10 mainly consisting of rovings made of glass fiber, carbon fiber, etc. are rolled up only in the grip portion and interposed only in the grip portion of the core material 5, making it lightweight. Since the bending rigidity of the grip part is large, the FW method increases the FR
When producing a bat by forming the P layer, reinforcing fiber 1
Since the reinforcing fibers 10 can be wrapped around the core material 5 with sufficient tension applied thereto, it is possible to form an FRP layer that takes advantage of the characteristics of the reinforcing fibers 10.

Further, by arranging glass fiber in the inner layer and arranging carbon fiber, which has a higher Young's modulus than glass fiber, in the outer layer, the grip portion has strong bending rigidity.

In addition, because the glass fiber layer 8 is placed on the outermost layer of the area corresponding to the ball-hitting part, and because the core material of the ball-hitting part is composed of foamed synthetic resin alone, the compressive strength is significantly higher than that of conventional ones. Therefore, it is possible to supply a durable FRP bat.

In addition, in the FRP bat of the present invention, the reinforcing fibers 10 interposed in the core material are completely covered with foamed synthetic resin, so unlike conventional FRP bats, the matrix resin does not penetrate into the core material. Therefore, there is no variation in the weight of the molded product, and there is an effect of reducing the amount of matrix resin consumed.

In addition, the bending rigidity of the grip part increases,
Even if you miss the batting center when hitting a ball, the impact on your hand will be reduced.

The reason why the ball resonates in the hands is that the bat vibrates due to the impact when the ball is hit, and the larger the amplitude generated by the vibration, the more the impact will resonate in the hands.

Therefore, if you attach a stray gauge to the grip and measure the magnitude of the amplitude, you can set the case where the ball hits the grip side with the batting core removed, and use the conventional foamed synthetic resin core material and glass fiber. When comparing an FRP bat with an FRP layer formed thereon and an FRP bat of the present invention, while the conventional bat exhibited a maximum amplitude of 5000 μs, the bat of the present invention had a maximum amplitude of 1200 ILs, which was approximately one-quarter lower. We were able to numerically demonstrate that even when the bat of the present invention is hit off-center, it does not hit the ball in the hands as much as a conventional bat.

Furthermore, in the bat of the present invention, the weight can be adjusted as desired by changing the expansion ratio of the polyurethane resin used for molding the core material, making it easy to adjust the weight without changing the balance of the bat. Effects such as being able to do so occur.

Table 1 shows the characteristic values of the bending characteristics of the grip portions of conventional wooden bats, FRP bats, and the FRP bat according to the present invention.

[Brief explanation of the drawing]

FIG. 1 is a front view of an FRP bat, and FIG. 2 is a cross-sectional perspective view of a portion A in FIG. 1 of a conventional FRP bat. FIG. 3 is a cross-sectional perspective view showing the portion B in FIG. 1 of a conventional FRP bat. FIG. 4 is a cross-sectional perspective view showing the ball hitting part of the FRP bat according to the present invention. FIG. 5 is a perspective view showing the grip portion of the FRP bat according to the present invention. FIG. 6 is a longitudinal sectional view showing the FRP bat according to the present invention. 1... FRP bat, 2... Foamed synthetic resin core material, 3... Glass cloth, 4...
...Coating film, 5...Foamed synthetic resin core material, 6...
... GFRP straight ply layer, 7 ... Carbon fiber angle ply layer, ... Glass fiber angle ply layer, 9 ... Paint film, 10 ...
...Reinforcement fiber, 11...FRP layer.

Claims (1)

[Scope of utility model registration request] Reinforcing fibers, mainly rovings made of glass fibers, carbon fibers, etc., are rolled up into a roll and placed in the area corresponding to the grip, along the outer circumferential surface of a foamed synthetic resin core material with a bat-shaped bottom, along the entire length of the bat. It has a straight ply layer in which glass fiber roving yarns are arranged, and on the straight ply layer, an angle ply layer made of carbon fibers arranged at an angle with respect to the overall length direction of the bat. F characterized by a structure in which an angle ply layer made of glass fiber is further formed on the ply layer at a portion corresponding to the bat hitting part.
RP bat.