TWI620585B - Baseball bat - Google Patents

Abstract

A baseball bat comprising a ball striking portion, a grip portion, a diagonal portion connecting the ball striking portion and the grip portion, and a cover attached to the top of the ball striking portion a head cover portion; the main point is that the baseball bat has a hollow basic core material extending from the grip portion to the bottom end of the head cover portion, and the outer surface of the hollow base material of the baseball bat is disposed At least three different material layers are combined, and the at least three different material layers are integrated with the baseball bat and the hollow basic core material, and the present invention uses the at least three different material layers combined with the hitting portion to hit the ball to enhance the The shock absorption and strength effects of the baseball bat are not reduced, and the overall weight of the baseball bat can be reduced, and the performance of the high-reaction performance can be improved to improve the stability of the shot.

Description

Baseball bat

A bat, in particular, a baseball bat having shock absorption and strength.

The bats used in general baseball are made of a single material, which is roughly classified into wooden bats and aluminum bats. Each of the foregoing bats has advantages and disadvantages. Among them, the advantages of the wooden bat are that the hitter feels more comfortable in hitting the ball, and the selling price is cheap, but the disadvantage of the wooden bat is that the weight is heavier. The hitter is slow and strenuous at the swing speed, making the ball hit by the swing is not strong enough and the flight distance is short; the two are the fragile structure of the wooden bat, which is easy to break or even break after the swing; The vibration generated by the wooden bat when hitting the ball is large, causing the player's hand to feel numb and even cause injury.

Although the weight of the aluminum bat is lighter than the weight of the wooden bat and the strength is good, the disadvantage is that when hitting the ball, the hitting part of the aluminum bat is dented by the striking force, and the hitter holds the hand. The grip will feel the vibration, and even more will be a sharp and harsh shot and the afterglow. The other thing that cannot be improved is that the entire wooden bat and the aluminum bat are difficult to grasp using the same material.

Therefore, how to effectively improve the shock absorption and strength effects of conventional wooden bats and aluminum bats, and to reduce the weight of the assurance and improvement, has been actively researching the goal of improvement.

The invention relates to a conventional wooden bat and an aluminum bat which are made of the same material, and can improve the problems that the conventional wooden bat and the aluminum bat cannot absorb shock, have poor strength and can reduce weight. Accordingly, the present invention provides an effect of reducing the shock absorption and strength of the baseball bat, and further reducing the weight of the baseball bat as a whole.

For the purpose of the foregoing invention, the technical solution adopted by the present invention is to provide a baseball bat comprising a ball striking portion, a grip portion, and an oblique connection between the ball striking portion and the grip portion. a segment portion, the large diameter end of the oblique segment portion is connected to one end of the ball striking portion, the small diameter end of the oblique segment portion is connected to one end of the grip portion, and a cap portion attached to the top end of the ball striking portion is attached The main purpose is that the baseball bat has a hollow basic core material extending from the grip portion to the inner end of the head cover portion, and the bottom end of the head cover portion extends to the ball striking portion. The outer surface of the hollow basic core material is provided with at least three different material layers including a first material layer connecting the outer surface of the hollow base material of the ball striking portion; and a second material layer connecting the outer surface of the first material layer And a third material layer covering the outer surface of the second material layer, wherein an outer diameter of the hollow basic core material of the baseball bat is 30% to 60% of an outer diameter of the ball striking portion, The first material layer is made of a resin material, and the outer diameter of the first material layer is The outer diameter of the ball striking portion is 40% to 75%, and the second material layer is made of a foaming material, and the outer diameter of the second material layer is 90% to 99.5% of the outer diameter of the ball striking portion, and The third material layer of the outer surface of the second material layer is selected from a resin sheet, and the outer diameter of the third material layer is 100% of the outer diameter of the ball striking portion.

Furthermore, in the baseball bat of the present invention, the outer surface of the first material layer forms a rough surface having a concave-convex shape, and is integrated with the second material layer.

Further, in the baseball bat according to the present invention, the second material layer is made of a material having a light specific gravity and is selected from a foamed material.

Further, the baseball bat according to the present invention, wherein a half of the longitudinal direction of the hollow basic core of the ball striking portion of the baseball bat begins to be biased toward one end of the grip portion, and the hollow basic core material And a connecting portion of the small-diameter end of the inclined portion has a protrusion portion which is disposed between 7% and 1.5% of the total length of the hollow basic core material, so that the protruding portion and the outer surface of the hollow basic core material The second material layer is provided to be joined on a single side.

Further, in the baseball bat according to the present invention, the hollow basic core material of the baseball bat is made of a light metal having a specific gravity of 3.0 to 1.5 and a hollow cylindrical metal tube.

Further, in the baseball bat according to the present invention, the hollow basic core material of the baseball bat is made of a solid cylindrical shape made of wood or bamboo having a specific gravity of between 0.95 and 0.6.

Further, in the baseball bat according to the present invention, the hollow basic core material of the baseball bat is selected from FRP glass fiber reinforced plastic with a specific gravity of 2.6 to 1.0, or PI polyimine or PEEK. Polyetheretherketone, or PPS polyphenylene sulfide is a super-engineered plastic represented by a hollow cylindrical shape.

Further, in the baseball bat according to the present invention, the baseball bat has a handle tail portion engaged with the bottom end of the grip portion; wherein the head cover portion is integrated with the at least three different material layers.

Further, the baseball bat according to the present invention, wherein the baseball bat is disposed on the outer surface of the hollow basic core material of the ball striking portion, and the at least three different material layers extend to the hollow portion of the inclined portion The outer surface of the basic core material is disposed, and the at least three different material layers are integrated with the baseball bat and the hollow basic core material.

Further, the baseball bat according to the present invention, wherein the baseball bat is provided on the outer surface of the first material layer of the outer surface of the hollow basic core material of the oblique portion to form a rough surface having a concave-convex shape, Provided in combination with the second material layer.

Further, in the baseball bat according to the present invention, the first material layer is made of a resin, or a fiber reinforced plastic, or a synthetic plastic, and has a weight reducing area inside the inclined portion.

Further, the baseball bat according to the present invention, wherein the first material layer and the third material layer or the second material layer and the third material layer of the at least three different material layers extend to the baseball The outer surface of the hollow base material of the oblique portion of the bat, the first material layer and the third material layer or the second material layer and the third material layer, and the baseball bat and the hollow The basic core material is integrated into one.

Further, in the baseball bat according to the present invention, the first material layer is made of a resin, or a fiber reinforced plastic, or a synthetic plastic, and has a weight reducing area inside the inclined portion.

Further, the baseball bat according to the present invention, wherein the first material layer of the at least three different material layers is disposed on an outer surface of the hollow basic core material of the oblique portion of the baseball bat, the first a second material layer disposed on an outer surface of the hollow basic core material of the ball striking portion of the baseball bat, the second material layer being selected from a foaming material, and inside the second material layer and in the hollow basic core material The outer surface has a plurality of hard bodies arranged at intervals or at different intervals. The hard bodies are made of a hard material, and the hard bodies are respectively integrated with the second material layer and the hollow basic core material, and are disposed at the outer surface. The second material layer of the ball striking portion and the first material layer of the bevel portion The outer surface is covered with the third material layer and integrated into one body, and the third material layer is selected from a resin sheet.

Further, in the baseball bat according to the present invention, both ends of the hard bodies are formed in a convex or wavy circular shape toward the outer surface of the baseball bat, respectively.

Further, in the baseball bat according to the present invention, the first material layer of the baseball bat provided in the oblique portion is made of resin, fiber reinforced plastic, or synthetic plastic, and is inside the inclined portion. Has a weight loss zone.

With this innovative and unique design, the present invention can achieve the following effects as compared with the prior art:

The baseball bat of the present invention has a hollow basic core material extending from the grip portion to the bottom end of the head cover portion, and the outer surface of the hollow basic core material of the baseball bat is configured with at least three different material layers. The at least three different material layers are disposed on the ball striking portion of the baseball bat or the outer surface of the hollow basic core material disposed on the ball striking portion and the oblique segment portion, the at least three different material layers and the baseball bat And the hollow basic core material is integrated into one body, so that the baseball bat has shock absorption and strength effects, and the overall weight of the baseball bat can be reduced, and the baseball bat can be used as a low specific gravity and high reverse performance. Design, can improve the stability of the shot.

1‧‧‧ baseball bat

10‧‧‧Handle tail

11‧‧‧ hollow basic core material

110‧‧‧ hollow

111‧‧‧ front section

112‧‧‧ middle section

113‧‧‧After

12‧‧‧Protruding

2‧‧‧Balling Department

3‧‧‧ grips

4‧‧‧ oblique section

41‧‧‧ Large diameter end

42‧‧‧Small diameter end

43‧‧‧ Weight loss area

5‧‧‧ head cover

51‧‧‧ fitting slot

52‧‧‧Abutment

6‧‧‧First material layer

61‧‧‧Rough surface

7‧‧‧Second material layer

8‧‧‧ third material layer

9‧‧‧ Hard body

Fig. 1 is a partially cutaway perspective view showing the first embodiment of the baseball bat of the present invention.

Fig. 2 is a front view of Fig. 1.

Figure 3 is a partially cutaway perspective view showing a second embodiment of the baseball bat of the present invention.

Figure 4: is a front view of Figure 3.

Fig. 5 is a partially cutaway perspective view showing a third embodiment of the baseball bat of the present invention.

Figure 6 is a front view of Figure 5.

Figure 7 is a partially cutaway perspective view showing a fourth embodiment of the baseball bat of the present invention.

Figure 8 is a front view of Figure 7.

Figure 9 is a partially cutaway perspective view showing a fifth embodiment of the baseball bat of the present invention.

Figure 10: Front view of Figure 9.

The purpose, technical contents, features, and effects achieved by the present invention will become more apparent from the detailed description of the appended claims.

Before the present invention is described in detail, it is noted that in the following description, like elements are denoted by the same reference numerals.

Referring to FIG. 1 and FIG. 2, in a first embodiment of the baseball bat of the present invention, the baseball bat 1 includes a ball striking portion 2, a grip portion 3, a connecting ball striking portion 2 and the grip portion. a slanted portion 4 between the holding portions 3, the large diameter end 41 of the inclined portion 4 is connected to one end of the ball striking portion 2, and the small diameter end 42 of the inclined portion 4 is connected to one end of the grip portion 3, and The head cover portion 5 is attached to the top end of the ball striking portion 2, mainly because the baseball bat 1 has a hollow basic core material extending from the grip portion 3 to the inner end of the bottom end portion of the head cover portion 5. And at least three different materials are disposed on the outer surface of the hollow base material 11 extending from the bottom end of the head cover portion 5 to the ball striking portion 2 a layer comprising a first material layer 6 connecting the outer surface of the hollow core material 11 of the ball striking portion 2; a second material layer 7 connecting the outer surface of the first material layer 6; and a layer covering A third material layer 8 on the outer surface of the second material layer 7. The hollow basic core material 11 has a hollow inner portion 110, and the at least three different material layers are integrated with the baseball bat 1 and the hollow basic core material 11. The baseball bat 1 of the present invention has a handle tail 10 that engages with the bottom end of the grip portion 3; wherein the head cover portion 5 is integrated with the at least three different material layers.

Referring to FIGS. 1 and 2 and FIGS. 5 and 6 , the first material layer 6 of the at least three different material layers extends from the bottom end of the head cover portion 5 to the hollow basic portion of the ball striking portion 2 . The outer surface of the core material 11 is disposed, or as shown in FIGS. 3 and 4, the at least three different material layers are extended to the outer surface of the hollow base material 11 of the oblique portion 4, the at least three different materials The layer is integrated with the baseball bat 1 and the hollow base core 11 .

More specifically, referring to the first, second, and fifth to tenth drawings, the first material layer 6 and the third material layer 8 or the second material layer 7 of the at least three different material layers and the a third material layer 8 extending to an outer surface of the hollow base material 11 of the oblique portion 4 of the baseball bat 1 , the first material layer 6 and the third material layer 8 or the second material layer 7 and the third material layer 8 are integrated with the baseball bat 1 and the hollow base core 11 .

More specifically, referring to FIGS. 1 to 6 , the second material layer 7 extends from the bottom end of the head cover portion 5 to the ball striking portion 2 and the first material layer 6 of the oblique portion 4 . The outer surface is covered, or as shown in Figures 7 and 8, the second material layer 7 is from the bottom of the head cover 5 The end begins to extend to the outer surface of the first material layer 6 of the ball striking portion 2.

More specifically, referring to FIGS. 1 to 10, the third material layer 8 extends from the bottom end of the head cover portion 5 to the ball striking portion 2, or to the ball striking portion 2 and the oblique portion. The outer surface of the second material layer 7 of the portion 4 is coated to join the first material layer 6, the second material layer 7, and the third material layer 8.

More specifically, please refer to FIG. 1 to FIG. 10 , the hollow basic core material 11 of the present invention is disposed on the baseball bat composed of the ball striking portion 2 , the inclined segment portion 4 and the grip portion 3 . 1 axis. The hollow basic core material 11 has three sections: a front section 111, a middle section 112 and a rear section 113. The front section 111 is disposed on the ball striking portion 2 and interconnected with the bottom end of the head cover portion 5, and the middle portion 112 is disposed at the oblique portion portion 4, The rear section 113 is such that the grip portion 3 is exposed.

Referring to FIG. 1 and FIG. 2, a central end of the bottom end portion of the head cover portion 5 is provided with an abutting end 52 having a fitting groove 51 therein. The fitting groove 51 provides the hollow basic core material 11. The front section 111 is embedded, and the front section 111 of the hollow basic core material 11 and the head cover part 5 are connected to each other, wherein the shape of the abutting end 52 is convex as shown in the first, second and fifth to tenth figures. Or as shown in Figures 3 and 4, it is set to a flat surface, but it is not limited to this embodiment.

More specifically, and referring to FIGS. 1 to 10, the hollow basic core material 11 of the baseball bat 1 of the present invention is made of a light metal having a specific gravity of 3.0 to 1.5 and a hollow cylindrical metal tube. Furthermore, the hollow basic core material 11 is made of FRP glass reinforced plastics having a specific gravity of 2.6 to 1.0, or selected by PI polyimide. Or a hollow cylindrical shape made of PEEK polyether ether ketone or super engineering plastic represented by PPS polyphenylene sulfide. Further, the hollow base material 11 is made of a solid cylindrical shape made of wood or bamboo having a specific gravity of 0.95 to 0.6.

Referring to FIG. 1 and FIG. 2, in a first embodiment of the baseball bat of the present invention, the first material layer 6 of the baseball bat 1 is a resin material, and the length of the first material layer 6 is configured from The abutting end 52 of the bottom end of the head cover portion 5 begins to extend to the ball striking portion 2, the second material layer 7 is a foam material, and the length of the second material layer 7 is the abutment from the bottom end of the head cover portion 5. The outer periphery of the end 52 extends to the ball striking portion 2 and the small diameter end 42 extending to the oblique portion 4, and the second material layer 7 is wrapped around the first material layer 6 and the hollow basic core material 11. On the surface, the third material layer 8 is a resin sheet, and the third material layer 8 is coated on the outer surface of the second material layer 7, such that the first material layer 6, the second material layer 7, and the The third material layer 8 is combined and integrated with the baseball bat 1 and the hollow base core 11 .

Referring to FIGS. 3 and 4, the second embodiment of the baseball bat of the present invention is substantially the same as that disclosed in FIGS. 1 and 2, except that the first material of the baseball bat 1 is the same. The layer 6 is a resin material, and the length of the first material layer 6 is extended from the abutting end 52 of the bottom end of the head cover portion 5 to a small diameter of the inclined portion 4 having an outer diameter larger than the outer diameter of the grip portion 3. The second material layer 7 is a foamed material, and the length of the second material layer 7 is extended from the abutting end 52 of the bottom end of the head cover portion 5 to a middle position of the inclined portion 4, A second material layer 7 is coated on the outer surface of the first material layer 6, the third material layer 8 is a resin sheet, and the third material layer 8 is coated on the second material layer 7 and the first material layer The first material layer 6, the second material layer 7, and the third material layer 8 are combined on the outer surface of the outer layer 6, and then integrated with the baseball bat 1 and the hollow basic core material 11.

Referring to FIGS. 5 and 6, the third embodiment of the baseball bat of the present invention is substantially the same as that disclosed in FIGS. 1 and 2, except that the baseball bat 1 is in the hitting portion. A half of the longitudinal direction of the hollow basic core material 11 of the second base member 11 is biased toward one end of the grip portion 3, and the hollow basic core member 11 has a projection portion 12 having a thickness larger than that of the other portion, and the projection portion 12 is provided at the oblique portion The joint of the small diameter end 42 of the segment 4 with one end of the grip portion 3. Further, the protruding portion 12 is disposed between 7% and 1.5% of the entire length of the hollow basic core member 11, and the second material layer is disposed on the outer surface of the protruding portion 12 and the hollow basic core member 11. 7 single side phase connection.

Referring to FIGS. 5 and 6, the first material layer 6 of the baseball bat 1 is a resin material, and the length of the first material layer 6 is from the abutting end of the bottom end of the head cover portion 5. 52 begins to extend to the ball striking portion 2, the second material layer 7 is a foam material, and the length of the second material layer 7 is extended from the outer periphery of the abutting end 52 of the bottom end of the head cover portion 5 to the oblique portion. The small diameter end 42 of the segment 4 is joined to the protrusion 12 of the grip portion 3 at the small diameter end 42 of the oblique portion 4, and the second material layer 7 is coated on the first material layer 6 On the outer surface, the third material layer 8 is a resin sheet, and the third material layer 8 is coated on the outer surface of the second material layer 7 and the hollow base material 11, so that the first material layer 6 The second material layer 7 and the third material layer 8 are combined and integrated with the baseball bat 1 and the hollow base core 11 .

Referring to FIGS. 7 and 8 , the fourth embodiment of the baseball bat of the present invention is substantially the same as that disclosed in FIGS. 1 and 2 , except that the first material of the baseball bat 1 is the same. The layer 6 is a resin material, and the length of the first material layer 6 is extended from the abutting end 52 of the bottom end of the head cover portion 5 to the small diameter end 42 of the inclined portion 4, wherein the inclined portion 4 has A weight reduction zone 43 is provided, so that the baseball bat 1 can reduce the weight and the shock absorption and strength effects of the baseball bat 1 are not reduced, and can be designed as a high-reaction performance to improve The stability of the baseball bat 1 hitting the ball. The second material layer 7 is a foamed material, and the length of the second material layer 7 is configured from the head The outer periphery of the abutting end 52 of the bottom end of the cover portion 5 begins to extend to the ball striking portion 2, and the second material layer 7 is coated on the outer surface of the first material layer 6, the third material layer 8 being a resin sheet. The third material layer 8 is coated on the outer surface of the second material layer 7 and the first material layer 6, such that the first material layer 6, the second material layer 7, and the third material layer 8 In combination, the baseball bat 1 and the hollow base core 11 are combined to be integrated.

Referring to FIGS. 1 to 8 again, the second material layer 7 of the baseball bat 1 of the present invention is made of a material having a light specific gravity and is selected from a foaming material.

Referring to FIG. 1 to FIG. 8 again, the outer surface of the first material layer 6 of the baseball bat 1 of the present invention forms a rough surface 61 having a concave-convex shape, and is integrally connected with the second material layer 7. The bond between the first material layer 6 and the second material layer 7 is made better.

As shown in the above first to eighth figures, the outer diameter of the ball striking portion 2, the grip portion 3, and the oblique portion 4 of the baseball bat 1 of the present invention is directed to the baseball bat 1 thereof. The outer diameter of the ball striking portion 2, wherein the outer diameter of the hollow basic core material 11 of the baseball bat 1 is 30% to 60% of the outer diameter of the ball striking portion 2, and the first material layer 6 is made of resin. The outer diameter of the first material layer 6 is 40% to 75% of the outer diameter of the ball striking portion 2. The second material layer 7 is made of a foaming material, and the outer diameter of the second material layer 7 is The outer diameter of the second material layer 7 is selected from the outer diameter of the ball striking portion 2 by 90% to 99.5%, and the third material layer 8 of the outer surface of the second material layer 7 is selected from a resin sheet. 100% of the outer diameter of the portion 2.

Referring to FIGS. 7 and 8 again, the baseball bat 1 of the present invention has the at least three different material layers disposed on the outer surface of the hollow base material 11 of the inclined portion 4, and the hitting portion. The at least three different material layers of the outer surface of the hollow basic core material 11 of 2 are integrated into one body, wherein the first material of the baseball bat 1 disposed on the outer surface of the hollow basic core material 11 of the inclined portion 4 Layer 6 is made of resin, or fiber reinforced plastics, or synthetic plastic.

Referring again to FIGS. 9 and 10, the fifth embodiment of the baseball bat of the present invention is substantially the same as that disclosed in FIGS. 1 and 2, except that the first of the at least three different material layers is the same. A material layer 6 is disposed on an outer surface of the hollow base core 11 of the oblique portion 4 of the baseball bat 1, and the second material layer 7 is disposed on the hollow base of the ball striking portion 2 of the baseball bat 1. The outer surface of the core material 11, the second material layer 7 is made of a foamed material, and a plurality of hard bodies disposed at intervals or at different intervals inside the second material layer 7 and on the outer surface of the hollow base material 11 9. The hard bodies 9 are made of a hard material, and the hard bodies 9 are integrated with the second material layer 7 and the hollow base material 11 respectively, and the second material is disposed on the ball striking portion 2. The layer 7 and the outer surface of the first material layer 6 disposed on the inclined portion 4 are covered with the third material layer 8 and integrated into one body. The third material layer 8 is made of a resin sheet. The two ends of the hard bodies 9 are formed into a convex circular shape or a corrugated circular shape toward the outer surface of the baseball bat 1, respectively, but are not limited to the embodiment. The first material layer 6 disposed on the inclined portion 4 of the baseball bat 1 is made of resin, fiber reinforced plastic, or synthetic plastic, and has the weight reducing area 43 inside the inclined portion 4, From the weight-reduction zone 43, the baseball bat 1 can be lightened, and the baseball bat 1 can have excess weight to be used as a basis for weighting, so that the baseball bat 1 has a high-reflex performance design. The stability of the hitting mistake is improved, so that the efficacy of the present invention can be achieved.

The above is only the preferred embodiment of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the contents of the present invention and not to limit the scope of the practice of the present invention; Equivalent variations or modifications of the shapes, configurations, features, and spirits of the present invention are intended to be included within the scope of the present invention.

Claims (16)

a baseball bat comprising a ball striking portion, a grip portion, and a diagonal portion connecting the ball striking portion and the grip portion, the large diameter end of the oblique segment portion connecting the batting ball One end of the portion, the small diameter end of the inclined portion is connected to one end of the grip portion, and a cap portion that is attached to the top end of the ball striking portion; wherein the baseball bat has a self-holding The portion begins to extend to the hollow base core material connected to the bottom end of the head cover portion, and at least three different material layers are disposed at the bottom end of the head cover portion to extend to the outer surface of the hollow base material of the ball striking portion. a first material layer comprising an outer surface of the hollow base core material connecting the ball striking portion; a second material layer connecting the outer surface of the first material layer; and a first layer covering the outer surface of the second material layer a material layer, wherein an outer diameter of the base core material of the baseball bat is 30% to 60% of an outer diameter of the ball striking portion, and the first material layer is made of a resin material, and the first material layer is The outer diameter is 40% to 75% of the outer diameter of the ball striking portion, and the second material layer is made of a foam material. The outer diameter of the second material layer is 90% to 99.5% of the outer diameter of the ball striking portion, and the third material layer of the outer surface of the second material layer is a resin material, the third material layer The outer diameter dimension is 100% of the outer diameter of the ball striking portion. The baseball bat according to claim 1, wherein the outer surface of the first material layer forms a rough surface having a concavo-convex shape, and is integrated with the second material layer. The baseball bat according to claim 1, wherein the second material layer is made of a material having a light specific gravity and is selected from a foaming material. The baseball bat according to claim 1, wherein a half of a length direction of the hollow basic core material of the ball striking portion of the baseball bat starts to be biased toward one end of the grip portion, and the hollow base core is The material and the small-diameter end connection position of the inclined portion have a protrusion portion which is disposed between 7% and 1.5% of the total length of the hollow basic core material, so that the protrusion portion and the hollow basic core material are outside The second material layer disposed on the surface is joined to a single side. The baseball bat according to claim 1, wherein the hollow basic core material of the baseball bat is made of a light metal having a specific gravity of 3.0 to 1.5 and a hollow cylindrical metal tube. The baseball bat according to the first aspect of the invention, wherein the hollow basic core material of the baseball bat is made of a solid cylindrical shape of wood or bamboo having a specific gravity of between 0.95 and 0.6. The baseball bat according to claim 1, wherein the hollow basic core material of the baseball bat is selected from FRP glass fiber reinforced plastic with a specific gravity of 2.6 to 1.0, or PI polyimine, or PEEK polyetheretherketone, or PPS polyphenylene sulfide is a super-engineered plastic hollow cylinder. The baseball bat according to claim 1, wherein the baseball bat has a handle tail that engages with a bottom end of the grip portion; wherein the head cover portion is integrated with the at least three different material layers. The baseball bat according to claim 1, wherein the baseball bat is disposed on the outer surface of the hollow basic core material of the ball striking portion, and the at least three different material layers extend to the oblique portion The outer surface of the hollow basic core material is disposed, and the at least three different material layers are integrated with the baseball bat and the hollow basic core material. The baseball bat according to claim 9, wherein the baseball bat is provided on the outer surface of the first material layer of the outer surface of the hollow basic core material of the oblique portion to form a rough surface Provided in combination with the second material layer. The baseball bat according to claim 10, wherein the first material layer is made of a resin, or a fiber reinforced plastic, or a synthetic plastic, and has a weight loss zone inside the inclined portion. The baseball bat according to claim 1, wherein the first material layer and the third material layer or the second material layer and the third material layer of the at least three different material layers extend to the Providing an outer surface of the hollow base material of the oblique portion of the baseball bat, the first material layer and the third material layer or the second material layer and the third material layer, and the baseball bat and the The hollow basic core material is integrated into one. The baseball bat according to claim 12, wherein the first material layer is selected Resin, or fiber reinforced plastic, or synthetic plastic, and has a weight loss zone inside the inclined section. The baseball bat according to claim 1, wherein the first material layer of the at least three different material layers is disposed on an outer surface of the hollow basic core material of the oblique portion of the baseball bat, a second material layer is disposed on an outer surface of the hollow basic core material of the ball striking portion of the baseball bat, the second material layer is selected from a foaming material, and is inside the second material layer and in the hollow basic core material The outer surface has a plurality of hard bodies arranged at intervals or at different intervals, and the hard bodies are made of a hard material, and the hard bodies are respectively integrated with the second material layer and the hollow basic core material, and are disposed at The second material layer of the ball striking portion and the outer surface of the first material layer disposed on the oblique portion are covered with the third material layer and integrated into one body, and the third material layer is made of a resin sheet. The baseball bat according to claim 14, wherein both ends of the hard bodies are formed in a convex or wavy circular shape toward the outer surface of the baseball bat. The baseball bat according to claim 14, wherein the first material layer of the baseball bat provided in the oblique portion is made of resin, fiber reinforced plastic, or synthetic plastic, and is in the oblique portion. There is a weight loss zone inside.