TW201819007A - Bat structure comprising an assembly portion that makes a connecting site between a slanting segment portion and a grip portion more stable - Google Patents

Abstract

Disclosed is a bat structure. The bat includes: a hitting portion extending along an axial line; a slanting segment portion which consists of a first insetting segment along the axial line and insetted into the interior of the hitting portion and a second insetting segment far away from the first insetting segment and extending in such a way as being progressively reduced from the outer diameter of the first insetting segment, wherein an engagement structure is formed on a relative inner wall of the second insetting segment; an assembly portion which consists of an extensible segment along the axial line and corresponding to and abutting the engagement structure of the slanting segment portion, an inclined segment far away from the extensible segment, and an inner connecting hole formed in an interior of the assembly portion; a grip portion, which consists of a first connecting segment fixedly connected to the inner connecting hole and a second connecting segment far away from the first connecting segment; a head cover portion covering a top of the hitting portion; and a blocking portion abutting a terminal of the second connecting segment of the grip portion. The assembly portion makes a connecting site between the slanting segment portion and the grip portion more stable, so as to alleviate an impact force after the bat hitting a ball, reduce hand numbness after hitting a ball, and improve ball hitting feeling.

Description

Bat structure

The invention relates to a bat, in particular to a bat structure.

Please refer to FIG. 1-1 and FIG. 1-2 for a bat 1 of at least two stages. The bat 1 includes a hitting portion 11, an inclined portion 12, and a holding portion 13. A top end of the hitting portion 11 is engaged with a cover 14, and a tip of the hitting portion 11 has a first fitting portion 111. An inner edge of the first fitting portion 111 is provided with a first sawtooth section 112, and the inclined section. 12 A large-diameter end facing the hitting portion 11 has a second fitting portion 121 engaged with the first fitting portion 111, and an outer edge of the second fitting portion 121 is provided with the first saw-tooth segment 112. The engaged second sawtooth segment 122 has a third fitting part 123 at a small diameter end away from the second fitting part 121, and a third saw tooth is provided on an inner edge of the third fitting part 123. Segment 124. The small diameter end of the holding portion 13 facing the inclined segment portion 12 has a fourth fitting portion 131 engaged with the third fitting portion 123. An outer edge of the fourth fitting portion 131 is provided with a The fourth sawtooth segment 132 engages with the third sawtooth segment 124. After the ball 1 is hit, between the first fitting portion 111 of the hitting portion 11 and the second fitting portion 121 of the inclined portion 12 and the third fitting of the inclined portion 12 The engaging position between the engaging portion 123 and the fourth fitting portion 131 of the holding portion 13 is easily loosened by the impact force, so that the hitting portion 11, the inclined portion 12 and the holding of the bat 1 It is difficult to firmly bond the respective portions of the portion 13.

The technical problem to be solved by the present invention is to overcome the aforementioned problem that the joint position between the parts of the bat is loosened by the impact force after hitting the ball, so that the joint position between the parts of the bat is prone to instability. Disadvantages, the present invention provides a bat structure, which can stabilize the connection position between the sloping section and the holding section by using an assembly between the sloping section and the holding section of the bat to improve the ball The binding between the oblique section of the rod and the grip is stronger.

In order to achieve the object of the foregoing invention, the technical solution adopted by the present invention is to provide a bat structure, the bat includes a hitting portion, which extends along an axis; an oblique segment portion, which is in the direction of the axis and is opposite to the hitting portion; Is provided, and includes a first engagement section which is equal to the inside of the hitting portion and engages, and a second engagement section which is far from the first engagement section and which extends from the outer diameter of the first engagement section in a decreasing manner, The second engaging section forms a latching structure opposite to the inner wall; a set of standing portions is disposed in the second engaging section of the oblique section along the axis direction, and the grouping portion includes a corresponding one of the latching structures. A telescoping section that abuts, an inclined section that is far from the telescoping section and extends gradually from the outer diameter of the telescoping section, and an internal connection hole provided inside the assembly portion; a holding portion including a connection with the assembly portion The inner joint hole is fastened by a first joint section, and a second joint section that is far from the first joint section and extends from the outer diameter of the first joint section; a head cover that is close to the top of the hitting portion; And an abutting portion abutting on the end of the second engaging section of the holding portion.

Further, in the ball bat structure according to the present invention, the first engagement section of the inclined section portion has a first inner sleeve hole relatively to the inside, and the second engagement section has a first inner hole relatively to the inside. A second inner sleeve hole extending in a decreasing inner diameter of the sleeve hole and penetrating the first inner sleeve hole is used for the first inner sleeve hole in which the assembly portion faces the oblique section and is sleeved in the first inner sleeve hole. In the second inner sleeve hole, the latching structure is at least two protruding pieces protruding from the inner wall of the second inner sleeve hole of the second engaging section, and at least two are each two adjacent adjacent protruding pieces. The cross-section shape of the outer peripheral edge of the telescopic section of the assembly portion has at least two pushing pressures which are respectively inserted along the engaging channels of the latching structure and abut against the protrusions below the protruding pieces. And at least two caulking grooves between each two adjacent pressing members and for the protruding pieces of the latching structure to be inserted, the top surface of the telescopic section is along the pressing members and the An annular groove is defined between the inner peripheral edge of the embedded groove and the inscribed hole, and the annular groove is for the assembly portion to pass through the Below the latching structure of the inner wall of the second inner sleeve hole of the two engagement sections, the assembly portion is rotated on the inner wall of the second inner sleeve hole of the second engagement section to rotate the telescopic section. The pressing members and the inserting grooves are respectively aligned with the protruding members of the latching structure and the engaging channels and form a pressing relationship, so as to provide the second engaging section in which the assembly portion is fixed to the inclined section. Inside the second inner sleeve hole.

Further, in the ball bat structure according to the present invention, the range of rotation of the assembly portion on the inner wall of the second inner sleeve hole of the second engagement section of the inclined section is 10 degrees to 90 degrees.

Further, the bat structure according to the present invention, wherein the protruding members of the latching structure of the inclined section portion, the engaging channels and the pressing members of the telescopic section of the assembly portion and the pressing member These recesses correspond to rectangular shapes or oblique shapes, respectively.

Further, the bat structure according to the present invention, wherein the protruding members of the latching structure of the inclined section portion, the engaging channels and the pressing members of the telescopic section of the assembly portion and the pressing member These cavities have a step difference of 1.0mm to 3.0mm.

Further, in the bat structure according to the present invention, between the assembly portion and the second inner sleeve hole of the second engagement section of the inclined section portion, and the protruding pieces of the latch structure and A rubber material or a viscoelastic resin is used between the embedding channels and the pressing members of the telescoping section of the assembly portion and the embedding grooves for the assembly portion to be fixed to the second embedding section. Inside the second inner sleeve hole.

Further, in the ball bat structure of the present invention, the internal connection hole of the assembly portion is an internal thread; wherein the first engaging section of the gripping portion is an external thread and is connected to the internal connection of the assembly portion. The holes form a screw connection.

Further, in the bat structure according to the present invention, the batting portion, the inclined portion and the holding portion of the bat are composed of the same material or a combination of different materials; wherein the grouping portion is made of elastic material The assembly portion is composed of a different material combination with the batting portion, the oblique section portion and the holding portion of the bat.

Further, the structure of the bat of the present invention, wherein the hitting portion of the bat of material, which is the choice of a high strength (plastic) material is a strength of about ^{3kgf / mm 2 - 9kgf / mm} 2 PUR material comprising poly Polyurethane or FRP fiber reinforced plastics. The materials contained in FRP fiber reinforced plastics are CFRP carbon fiber reinforced plastics or GFRP glass fiber reinforced plastics. or a high strength plastic strength of about ^{3kgf / mm 2 - 9kgf / mm} 2, as it contains a material to the polycarbonate PC (polycarbonate) represented by engineering plastics (engineering plastics), or PEEK polymer material (Polyether® ether ketone) represented by super engineering plastics.

Further, in the bat structure according to the present invention, the material of the slanted section and the grip of the bat is selected from light metals having a specific gravity of 1.5 to 2.9, and the light metals are aluminum alloy or magnesium alloy, or FRP is selected. Fiber reinforced plastics. The materials contained in FRP fiber reinforced plastics are CFRP carbon fiber reinforced plastics or GFRP glass fiber reinforced plastics.

Further, in the ball bat structure according to the present invention, one end of the abutment portion has a base and a convex rod that is far away from the base and decreases stepwise from the outer diameter of the base, and the convex rod is used to communicate with the grip. The second engaging section of the holding section is internally engaged, or the abutting section and the second engaging section of the holding section are integrally combined.

Compared with the conventional structure, the bat structure of the present invention has the following characteristics: The oblique section and the holding part of the bat of the present invention have the assembly part to make the oblique section and the holding part The connection position is more stable to strengthen the combination between the slanted section of the bat and the grip, effectively alleviate the impact force of the bat after hitting the ball, reduce the numbness after playing, and improve the feel .

The following is a detailed description of how the structures of the present invention are combined and used in conjunction with the accompanying drawings. It should be easier to understand the purpose, technical content, features and effects achieved by the present invention.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are represented by the same numbers.

Please refer to FIG. 2-1 and FIG. 2-2. The present invention provides a bat structure. The bat 2 includes

A hitting portion 3 extends along an axis, and the hitting portion 3 is an inner hollow 31;

A slanted section 4 is disposed along the axial direction and is opposite to the hitting section 3. The slanted section 4 includes a first engaging section 41 which is equal to the hollow 31 inside the hitting section 3 and is embedded. A second engaging section 42 away from the first engaging section 41 and extending from the outer diameter of the first engaging section 41 in a decreasing manner, wherein the first engaging section 41 of the inclined section 4 is relatively inward It has a first inner sleeve hole 411, and the second engaging section 42 has a second inner sleeve hole extending from the inner diameter of the first inner sleeve hole 411 in a decreasing manner and penetrating the first inner sleeve hole 411. 421, an inner wall of the second inner sleeve hole 421 of the second engagement section 42 forms a latch structure 43, and the latch structure 43 is at least two second inner sleeve holes 421 formed by the second engagement section 42. The protruding pieces 431 protruding from the inner wall are spaced apart, and at least two engagement channels 432 are respectively provided between every two adjacent protruding pieces 431;

A set of standing portions 5 is inserted in the first inner sleeve hole 411 along the axis direction and faces the inclined section 4 and is fixed in the second inner sleeve hole 421. The set of standing portions 5 includes A telescopic section 51 corresponding to the latching structure 43, an inclined section 52 that is far from the telescopic section 51 and extends from the outer diameter of the telescopic section 51 in a decreasing manner, and is provided inside the assembly portion 5 and can be inward A threaded inner connecting hole 53, wherein the cross-sectional shape of the outer peripheral edge of the telescopic section 51 of the assembly 5 has at least two embedded along the engaging channels 432 of the latching structure 43 and abuts against the protruding pieces 431. The lower pressing member 511 and at least two recessed grooves 512 between each two adjacent pressing members 511 and for the protrusions 431 of the latching structure 43 to be inserted, and the top of the telescopic section 51 An annular groove 54 is defined along the inner peripheral edges of the pressing members 511 and the embedded grooves 512 and the inscribed hole 53.

A gripping portion 6 includes a first engaging section 61 that is fastened to the inscribed hole 53 of the assembly portion 5 and a distance from the first engaging section 61 and away from the first engaging section 61. 61 is a second engaging section 62 with an outer diameter extending, and the second engaging section 62 is hollow inside 621, wherein the first engaging section 61 of the gripping portion 6 is externally threaded, and the inner connecting hole 53 of the assembly portion 5 is The internal thread is screwed tightly;

A head cover part 7 provided at the top end of the hitting part 3; and

An abutting portion 8 abuts on an end of the second engaging section 62 of the holding portion 6. The abutting portion 8 has a base 81 at one end, and a protruding rod 82 which is far away from the base 81 and gradually decreases in a stepped manner from the outer diameter of the base 81. The protruding rod 82 is used to communicate with the first portion of the holding portion 6. The hollow 621 inside the two joining sections 62 is joined, but the embodiment is not limited thereto. In other possible embodiments, the abutting portion 8 is integrated with the second engaging section 62 of the holding portion 6.

Please refer to FIGS. 2-1 and 2-2 again, the protruding pieces 431 and the engaging channels 432 of the latching structure 43 of the inclined section 4 and the telescopic section of the assembly 5 are disclosed. The pressing members 511 and the embedded grooves 512 of 51 correspond to rectangular shapes, but are not limited to this embodiment. In other possible embodiments, the shape is an oblique shape, but the embodiment is not limited thereto.

Please refer to FIG. 2-1 and FIG. 2-2 for details. When the present invention is assembled, when the assembly portion 5 faces the first inner sleeve hole 411 and the second inner sleeve hole 421 of the inclined portion 4 Before the inner sleeve is installed, the pressing members 511 and the inlays 512 of the telescopic section 51 of the assembly portion 5 and the card on the inner wall of the second inner sleeve hole 421 of the inclined section 4 are respectively respectively. The engaging channels 432 and the protruding pieces 431 of the latching structure 43 are aligned. When the assembly portion 5 passes through the inner wall of the second inner sleeve hole 421 of the second engaging section 42 of the inclined section 4, The outer diameter of the telescopic section 51 is reduced by the annular groove 54, and then the assembly portion 5 is gradually set under the latching structure 43. After that, the assembly portion 5 is disposed in the second engagement section 42. After the inner wall of the second inner sleeve hole 421 is rotated within a range of 10 degrees to 90 degrees, the pressing members 511 and the recesses 512 of the telescopic section 51 and the protruding members of the latching structure 43 are respectively made. After the 431 and the engagement channels 432 are aligned, the pressing members 511 of the telescopic section 51 use the annular groove 54 to spread outward to restore the original outer diameters of the pressing members 511 of the telescopic section 51. , And then with the latch structure 4 The protruding pieces 431 of 3 form an abutment relationship. The pressing pieces 511 of the telescopic section 51 of the assembly portion 5 and the protruding pieces 431 of the latching structure 43 of the inclined section 4 can be engaged. The purpose is to make the connection position between the inclined section 4 and the holding section 6 tighter through the assembly section 5 between the inclined section 4 and the holding section 6 of the bat 2 to The combination between the oblique section 4 and the gripping section 6 of the bat 2 is strengthened, and the assembly section 5 is a different material with elastic properties, so that the assembly section 5 is provided on the top surface of the telescopic section 51 with the The annular groove 54 can be fixed between the oblique section 4 and the gripping portion 6 after being hard-stretched, so that when the bat 2 of the present invention receives external force, it can achieve a local telescopic effect.

More specifically, the protruding pieces 431 and the engaging channels 432 of the latching structure 43 of the inclined section 4 and the pressing members 511 and the embedded grooves of the telescopic section 51 of the assembly section 5 The step difference of 512 is 1.0 mm to 3.0 mm.

Furthermore, between the assembly portion 5 and the second inner sleeve hole 421 of the second engagement section 42 of the inclined section 4, and the protruding pieces 431 and the engagements of the latching structure 43. A rubber material or a viscoelastic resin is used between the channel 432 and the pressing members 511 and the recessed grooves 512 of the telescopic section 51 of the assembly 5 for the assembly 5 to be fixed to the second insert. The second inner sleeve hole 421 of the connecting section 42 makes the joint between the assembly portion 5 and the second engaging section 42 of the inclined section 4 more firm.

Furthermore, the hitting portion 3, the inclined portion 4 and the holding portion 6 of the bat 2 are composed of the same material or a combination of different materials. Wherein, the assembly portion 5 is made of a material with elastic properties, and the assembly portion 5 is combined with the hitting portion 3, the inclined portion 4 and the holding portion 6 of the bat 2 into a combination of different materials. Wherein the ball striking portion 3 of the bat material 2 which is using high-intensity (plastic) material is a strength of about ^{3kgf / mm 2 - 9kgf / mm} 2 comprising the polyurethane material is a PUR (Polyurethane), or use FRP fiber Fiber reinforced plastics. The materials contained in FRP fiber reinforced plastics are CFRP carbon fiber reinforced plastics or GFRP glass fiber reinforced plastics, or high-strength plastics. The strength is about 3kgf / mm. ² - 9kgf / mm ^2, as it contains a material to the polycarbonate PC (polycarbonate) represented by engineering plastics (engineering plastics), or PEEK polymer material (polyether ether ketone) represented by super engineering plastics ( super engineering plastics).

Furthermore, the material of the inclined section 4 and the grip 6 of the bat 2 is selected from light metals with a specific gravity of 1.5 to 2.9, and the light metals are aluminum alloy or magnesium alloy, or FRP fiber reinforced plastics are selected. , FRP fiber reinforced plastic contains CFRP carbon fiber reinforced plastics (carbon fiber reinforced plastics) or GFRP glass fiber reinforced plastics (glass fiber reinforced plastics).

According to the present invention, according to the above-mentioned hitting performance of the hitting portion 3 of the bat 2 is high, the shock absorbing performance of the inclined portion 4 is high, and the strength of the gripping portion 6 is selected, the material is manufactured, and then the hitting portion 3 The various parts of the inclined section 4 and the holding section 6 are combined into a complete bat 2. When the bat 2 is used, the bat 2 is used to provide a hitter with the bat 2 having a high impact, and then the bat 2 directly vibrates and is transmitted to the oblique section 4 with high shock absorption. The shock force of the batting part 3 is transmitted through the inclined section part 4 after being damped, and then transmitted to the grip part 6 with high strength, so that the batman 2 shakes the oscillating force of the ball 2 After the shock is reduced through the inclined section 4 and then transmitted to the gripping section 6 held by the hand of the striker, the numbness in the hand of the striker can be relieved.

According to the present invention, the hitter is made of materials according to the performance of the hitting portion 3, the inclined portion 4 and the holding portion 6 of the bat 2 required for hitting, damping and strength, and then the parts are combined into Complete the finished product of the bat 2 to provide a variety of different properties and different properties. The invention can overcome the problem that it is difficult to balance the shock absorption and impact effects required by the batting portion 11 and the grip portion 13 of the bat 1, and completely break through the current production model of similar products, and has industrial use The benefits and values, as well as the fact that the product's practical effectiveness and safety are improved, are sufficient to meet the requirements of invention patents for practical use value. The filing of a patent application in accordance with the law is the main reason to be solved by the present invention.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the patent for the implementation of the present invention. Other equivalent changes using the patent spirit of the present invention shall all belong to the patent scope of the present invention.

(Usual)

1‧‧‧ bat

11‧‧‧ Batting Department

111‧‧‧First fitting part

112‧‧‧First Sawtooth Segment

12‧‧‧ oblique section

121‧‧‧ second fitting section

122‧‧‧Second Serrated Segment

123‧‧‧Third fitting part

124‧‧‧ The third sawtooth segment

13‧‧‧ holding section

131‧‧‧ Fourth fitting section

132‧‧‧ Fourth Sawtooth Segment

14‧‧‧ cover

(this invention)

2‧‧‧ bat

3‧‧‧ Batting Department

31‧‧‧ hollow inside

4‧‧‧ oblique section

41‧‧‧The first embedding section

411‧‧‧First inner sleeve hole

42‧‧‧Second embedding section

421‧‧‧Second inner sleeve hole

43‧‧‧Lock structure

431‧‧‧ protruding

432‧‧‧ road

5‧‧‧Assembly Department

51‧‧‧ Telescopic section

511‧‧‧ jacking parts

512‧‧‧ inlay

52‧‧‧inclined section

53‧‧‧Inner hole

54‧‧‧Circular groove

6‧‧‧ holding section

61‧‧‧first joint

62‧‧‧Second junction

621‧‧‧ Hollow inside

7‧‧‧ head cover

8‧‧‧Arrival Department

81‧‧‧base

82‧‧‧ convex rod

Figure 1-1: A perspective view of a conventional bat. Figure 1-2: A cross-sectional view of Figure 1-1 at the A-A position. Figure 2-1 is a three-dimensional exploded view of the present invention. Figure 2-2: Sectional sectional view of the three-dimensional assembly of Figure 2-1.

Claims (11)

A bat structure includes a batting portion that extends along an axis; an inclined portion that is disposed along the axis direction and is opposite to the batting portion, and the inclined portion includes A first engagement section is equal to the inside of the hitting section and is engaged, and a second engagement section away from the first engagement section and extending from the outer diameter of the first engagement section in a decreasing manner, the second engagement section A connecting structure is formed opposite the inner wall of the connecting section; a set of standing sections is arranged along the axis direction and is fixed in the second engaging section of the inclined section, and the connecting section includes a corresponding to the locking structure. A retractable telescopic section, an inclined section far from the telescopic section and decreasingly extending from the outer diameter of the telescopic section, and an internal connection hole provided inside the assembly portion; a holding portion, the holding portion includes a and A first joint segment that is fastened by the inner contact hole of the assembly portion, and a second joint segment that is far from the first joint segment and extends from the outer diameter of the first joint segment; A head cover portion at the top of the portion; and an abutment abutting on the end of the second engaging section of the holding portion unit. The bat structure according to item 1 of the patent application scope, wherein the first engaging section of the inclined section part has a first inner sleeve hole relatively to the inside, and the second engaging section has a first inner sleeve hole for the inner part. A second inner sleeve hole with a decreasing inner diameter of the inner sleeve hole and penetrating the first inner sleeve hole is used for the inner portion of the first inner sleeve hole in which the assembly portion faces the oblique section and is sleeved. In the second inner sleeve hole, the latching structure is at least two protruding pieces protruding from the inner wall of the second inner sleeve hole of the second engagement section, and at least two are each two adjacent to the The cross-section of the outer peripheral edge of the telescoping section of the assembly has at least two recesses that are respectively inserted along the engaging paths of the latching structure and abut against the projections below the projections. The pressing member, and at least two caulking grooves between each two adjacent pressing members and for inserting the protruding members of the latching structure, the top surface of the telescopic section is along the pressing members and An annular groove is defined between the inner peripheral edges of the embedded grooves and the inscribed hole, and the annular groove is provided for the assembly portion to pass through the inclined portion. Below the latching structure of the inner wall of the second inner sleeve hole of the second engagement section, the assembly portion is rotated on the inner wall of the second inner sleeve hole of the second engagement section to rotate the telescopic section. The pressing members and the recessed grooves are respectively aligned with the protruding pieces of the latching structure and the engagement channels and form an abutment relationship, so as to provide the second recesses in which the assembly portion is fixed to the inclined portion. The second inner sleeve hole of the connecting section. The bat structure according to item 2 of the scope of patent application, wherein the range of rotation of the assembly portion on the inner wall of the second inner sleeve hole of the second engagement section of the inclined section is 10 degrees to 90 degrees. . The bat structure according to item 2 of the scope of patent application, wherein the protruding pieces of the latching structure of the inclined section and the pressing members of the engagement channel and the telescopic section of the assembly section The inlays correspond to rectangular shapes or oblique shapes, respectively. The bat structure according to item 2 of the scope of patent application, wherein the protruding pieces of the latching structure of the inclined section and the pressing members of the engagement channel and the telescopic section of the assembly section The step difference between these recesses is 1.0 mm to 3.0 mm. The bat structure according to item 2 of the scope of patent application, wherein between the assembly portion and the second inner sleeve hole of the second engagement section of the inclined section portion, and the protrusions of the latch structure The rubber member or the viscoelastic resin is used between the fittings and the embedding channels and the pressing members of the expansion section of the assembly part and the embedding grooves for the assembly part to be fixed to the second insert. The second inner sleeve hole of the connecting section. The bat structure according to item 1 of the patent application scope, wherein the internal connection hole of the assembly portion is an internal thread; wherein the first engaging section of the holding portion is an external thread, and the connection portion of the assembly portion is externally threaded. The internal connection hole is screwed tightly. According to the bat structure described in item 1 of the scope of patent application, wherein the batting portion, the inclined portion and the holding portion of the bat are composed of the same material or a combination of different materials; wherein the assembly portion is An elastic material, the assembly portion is composed of a different material combination with the hitting portion, the inclined portion and the holding portion of the bat. The application of the bat structure patentable scope of item 1, wherein the hitting portion of the bat of material, which is the choice of a high strength (plastic) material is a strength of about ^{3kgf / mm 2 - 9kgf / mm} 2 material comprising PUR polyurethane or FRP fiber reinforced plastics. The materials contained in FRP fiber reinforced plastics are CFRP carbon fiber reinforced plastics or GFRP glass fiber reinforced plastics. ), or a high strength plastic strength of about ^{3kgf / mm 2 - 9kgf / mm} 2, as it contains a material to the polycarbonate PC (polycarbonate) represented by engineering plastics (engineering plastics), or PEEK polymeric material (polyether ether ketone) is represented by super engineering plastics. The bat structure according to item 1 of the scope of patent application, wherein the material of the slanted section and the grip of the bat is selected from light metals having a specific gravity of 1.5 to 2.9, and the light metals are aluminum alloy or magnesium alloy, or FRP fiber reinforced plastics are selected. The materials contained in FRP fiber reinforced plastics are CFRP carbon fiber reinforced plastics or GFRP glass fiber reinforced plastics. The bat structure according to item 1 of the scope of patent application, wherein one end of the abutment portion has a base and a convex rod which is far away from the base and descends stepwise from the outer diameter of the base, and the convex rod is used to communicate with The second engaging section of the holding section is internally engaged, or the abutting section and the second engaging section of the holding section are integrally combined.