Golf club head having a carbon fiber ball striking face plate

Abstract

The present application relates to a golf club head with carbon fiber ball hitting face plate, which comprises a hollow club head body and a carbon fiber ball hitting component arranged at the front end of the club head body, the ball hitting component has a ball hitting plate part and top and bottom extension parts respectively extending backward from the top and bottom ends of the ball hitting plate part, the ball hitting plate part and the left and right sides of the front side of the club head body form a ball hitting face, and the top and bottom extension parts are respectively extended and fixed to the top and bottom of the front end of the club head body, so that the carbon fiber ball hitting component is fixed to the front end of the club head body to have good strength and ball hitting performance, the ball hitting part and the top cover part of the club head are reduced in weight, the weight configuration margin of the golf club head is improved, and the C-shaped structure of the top and bottom ends of the ball hitting plate part of the ball hitting component extending the top and bottom extension parts can effectively avoid the situation that the ball hitting component is separated due to excessive impact shear force.

Description

Technical Field

[0001] This invention relates to a golf club head, and more particularly to a golf club head having a carbon fiber striking face. Background Technology

[0002] To improve the hitting performance of golf clubs, the construction of driver clubheads is usually achieved by changing materials and combining them with structural weight reduction. This alters the weight distribution of the clubhead and adjusts its center of gravity, thereby increasing the moment of inertia (MOI) of the golf club at impact. This, in turn, improves the stability of the golf ball's flight distance and trajectory after being struck.

[0003] Currently, in the various types of driver clubheads being developed in the industry, some clubheads combine components made of carbon fiber with components made of metal, employing a combination of dissimilar materials. For example, a clubhead may be divided into several parts, such as the clubhead body, the faceplate, and the top cap. The clubhead body may contain a weighting component. Some components of the aforementioned clubhead body, faceplate, and top cap may be made of metal, while the remaining components may be made of carbon fiber. Generally, a carbon fiber clubhead body is combined with a metal striking component at the front, or a metal clubhead body is combined with a carbon fiber striking component at the front.

[0004] Among the many existing clubheads that combine heterogeneous materials, those that use a metal clubhead body with a carbon fiber striking component typically have a panel mounting hole on the front face of the clubhead body, into which a plate-shaped striking panel is embedded; or they have an opening at the front of the clubhead body, into which a striking panel is embedded.

[0005] The existing golf clubhead structures, which combine a metal clubhead body with a carbon fiber striking element, can reduce weight by using lightweight carbon fiber. However, the carbon fiber striking face accounts for a disproportionately large portion of the clubhead's weight, limiting the effectiveness of weight reduction in clubhead weight distribution. Furthermore, the combination of the clubhead body and the striking face is prone to detachment during impact due to excessive shear force. Therefore, further structural improvements are necessary to address these issues with existing golf clubheads. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a golf club head with a carbon fiber striking face, which solves the problem that the existing golf club head structure of combining the front end of the metal club head body with the carbon fiber striking component has limited effect in reducing weight and transferring it to the club head weight configuration, and that the combination structure of the club head body with the striking face embedded in the front end of the striking face is prone to the striking face falling off due to excessive impact shear force.

[0007] The technical solution proposed in this invention is: to provide a golf club head with a carbon fiber striking face, comprising:

[0008] A hollow clubhead body, the front end of which has a front opening extending from the front side of the clubhead body to the top and bottom of the front end of the clubhead body, and one side of the clubhead body has an upwardly extending shaft connection portion; and

[0009] A carbon fiber striking component is fixed in the front opening of the clubhead body. The striking component has a striking face, and a top extension and a bottom extension extending rearward from the top and bottom of the striking face, respectively. The striking face, together with the front side of the clubhead body located on the left and right sides of the striking face, forms a striking surface. The top extension and the bottom extension extend and are fixed to the top and bottom of the front end of the clubhead body, respectively.

[0010] In the golf club head with a carbon fiber striking face as described above, the front opening of the club head body includes a front opening section, a top opening section, and a bottom opening section. The front opening section is located on the front side of the club head body. The top opening section and the bottom opening section are located at the top and bottom of the front end of the club head body, respectively, and are connected to the front opening section. The striking face portion matches the front opening section, the top extension matches the top opening section, and the bottom extension matches the bottom front opening section. A striking part bearing wall is formed on the periphery of the front opening of the club head body. The outer surface of the striking part bearing wall is lower than the outer surface of the club head body. The periphery of the striking part is fixed to the striking part bearing wall.

[0011] In the golf club head with carbon fiber striking face described above, the club head body is made of titanium alloy or stainless steel, the width of the top extension of the striking part in the front-to-back direction is 5mm to 25mm, and the width of the bottom extension of the striking part in the front-to-back direction is 5mm to 25mm.

[0012] In the golf club head with a carbon fiber striking face as described above, a top opening is formed at the top of the club head body, and a top cover component made of carbon fiber or polymer material is matched and bonded to the top opening of the club head body. A top cover support wall is formed at the periphery of the top opening of the club head body. The upper surface of the top cover support wall is lower than the top surface of the club head body, and the periphery of the top cover component is fixed to the top cover support wall at the periphery of the top opening.

[0013] In the golf club head with carbon fiber striking face described above, the club head body is made of titanium alloy or stainless steel. The width of the top extension of the striking part in the front-to-back direction is 5mm to 25mm, the width of the bottom extension of the striking part in the front-to-back direction is 5mm to 25mm, the front end of the top cover part is adjacent to the rear side of the top connection part of the striking part, and the rear end of the top cover part is close to the rear end of the club head body.

[0014] In the golf club head with a carbon fiber striking face as described above, a mounting hole is formed in the shaft connection portion of the club head body. The mounting hole extends from the top of the shaft connection portion into the interior of the club head body. A fixing hole is provided at the bottom of the club head body, corresponding to the vertical position of the mounting hole. A metal club connector is installed in the mounting hole of the shaft connection portion. The club connector extends into the fixing hole, and a screw is used to fix the bottom end of the club connector into the club head body through the fixing hole.

[0015] In the golf club head with a carbon fiber striking face as described above, the club connector is made of aluminum alloy, and the screw that secures the club connector is made of stainless steel.

[0016] In the golf club head with a carbon fiber striking face as described above, the bottom section of the front opening of the club head body extends past the fixing hole to the lower end adjacent to the club joint, and the bottom extension of the striking component extends to the lower end adjacent to the club joint.

[0017] In the golf club head with carbon fiber striking face as described above, a counterweight mounting part is provided at the rear end or bottom of the rear section of the club head body, and a counterweight component made of high specific gravity metal is fixed in the counterweight mounting part.

[0018] In the golf club head with a carbon fiber striking face as described above, the weight mounting part has a receiving recess extending from the rear end of the club head body toward the interior of the club head body, and a side wall is provided on the inner side of the receiving recess, and a screw hole is provided in the side wall; the weight component includes a body and a screw connection provided on one side of the body, and the screw connection is screwed into the screw hole of the weight mounting part, and the body is located in the receiving recess of the weight mounting part.

[0019] The present invention, through the aforementioned integral structure of a golf club head with a carbon fiber striking face, achieves the following beneficial effects:

[0020] 1. The overall structure of the hollow clubhead body is fixed with a striking component made of carbon fiber. The striking component, which is C-shaped when viewed from the side, is fixed to the front of the clubhead body. This allows the carbon fiber striking component to be fixed to the front of the clubhead body. It can achieve the necessary strength and pass the shot test. At the same time, the carbon fiber material can appropriately reduce the weight of the striking part at the front of the golf clubhead, thereby improving the weight distribution margin of the clubhead body and the weight distribution components.

[0021] 2. As mentioned above, the carbon fiber forming striking component has a C-shaped structure when viewed from the side. In addition to maintaining the necessary strength and reducing weight, the carbon fiber striking component can also extend to the top and bottom of the front end of the clubhead body through the top and bottom extensions of the top and bottom of the striking face. During impact, the force acting on the striking face of the carbon fiber striking component can be distributed and transmitted to the top and bottom of the clubhead body through the top and bottom extensions of the top and bottom of the striking face. This gives the golf clubhead excellent hitting performance and effectively prevents the striking component from falling off due to excessive impact shear force.

[0022] The golf club head of this invention further incorporates a striking section bearing wall formed around the periphery of the front opening of the club head body. This bearing wall provides a fixing and support component for the carbon fiber striking part, effectively enhancing the bonding strength between them and preventing the carbon fiber striking part from detaching from the club head body. Furthermore, by utilizing the striking section bearing wall of the club head body, which is located on both sides of the striking face of the carbon fiber striking part and interlocks with it, the performance of the carbon fiber striking part during impact is further improved.

[0023] The golf club head of the present invention can further form a top opening at the top of the club head body, and match a top cover component made of carbon fiber or polymer material to the top opening of the club head body. A top cover support wall is formed around the top opening of the club head body. The top cover support wall provides a fixing and support component for the top cover component. In addition to effectively reducing the weight of the carbon fiber forming hitting component fixed at the front end of the club head body, the top cover component of the non-hitting part is further made of carbon fiber or polymer material, which can be made thinner and lighter, thereby improving the weight distribution margin of the golf club head body.

[0024] The golf club head of the present invention can further be made such that the front end of the top opening of the club head body is adjacent to the rear side of the top section of the opening, and the rear end of the top opening extends to near the rear end of the club head body, so that the top opening is appropriately enlarged, and the area of ​​the carbon fiber top cover component is relatively increased. Combined with the thinning of the top cover component, the weight reduction is transferred to the weight configuration margin of the golf club head. Attached Figure Description

[0025] Figure 1 This is a perspective view of a preferred embodiment of the golf club head of the present invention.

[0026] Figure 2 yes Figure 1 The diagram shows a preferred embodiment of a golf club head.

[0027] Figure 3 yes Figure 1 and Figure 2 The diagram shows a side cross-sectional view of a preferred embodiment of a golf club head.

[0028] Figure 4 This is a perspective view of another preferred embodiment of the golf club head of the present invention.

[0029] Figure 5 yes Figure 4 The diagram shows a preferred embodiment of a golf club head.

[0030] Figure 6 yes Figure 4 and Figure 5 The diagram shows a side cross-sectional view of a preferred embodiment of a golf club head.

[0031] Figure 7 yes Figures 4 to 5 The diagram shows a front view of a preferred embodiment of a golf club head.

[0032] Figure 8 yes Figures 4 to 5 The diagram shows a top view of a preferred embodiment of a golf club head.

[0033] Figure 9 yes Figures 4 to 5 The diagram shows a bottom view of a preferred embodiment of a golf club head.

[0034] Figure 10 yes Figures 4 to 5 The diagram shows a side cross-sectional view of the preferred embodiment of the golf club head at the connection point between the club head and the shaft connector.

[0035] Brief explanation of the symbols in the attached diagram:

[0036] 10: Club head body

[0037] 11: Front opening

[0038] 111: Section before opening

[0039] 112: Opening Top Segment

[0040] 113: Opening bottom section

[0041] 114: Bearing wall of the striking part

[0042] 12: Top opening

[0043] 121: Top cover load-bearing wall

[0044] 13: Rod connection part

[0045] 131: Mounting Hole

[0046] 132: Fixing hole

[0047] 14: Counterweight Installation Department

[0048] 141: Accommodation recess

[0049] 142: Screw hole

[0050] 20: Striking components

[0051] 21: Striking panel

[0052] 22: Top extension

[0053] 23: Bottom extension

[0054] A: Width of the top extension in the front-to-back direction

[0055] B: Width of the bottom extension in the front-to-back direction

[0056] 30: Top cover component

[0057] 40: Cue connector

[0058] 41: Screw

[0059] 50: Counterweight components

[0060] 51:Ontology

[0061] 52:Screw joint Detailed Implementation

[0062] The following, in conjunction with the accompanying drawings and preferred embodiments of the present invention, further illustrates the technical means employed by the present invention to achieve its intended purpose.

[0063] like Figures 1 to 3 and Figures 4 to 6 As shown, these figures respectively disclose two preferred embodiments of the golf club head with a carbon fiber striking face of the present invention. As can be seen from these figures, the golf club head is a hollow wood club head type, which includes a club head body 10 and a striking component 20.

[0064] like Figures 1 to 3 and Figures 4 to 6As shown, the club head body 10 is a hollow component. The club head body 10 can be made of stainless steel, titanium alloy, aluminum, aluminum alloy, or other metal materials. In this preferred embodiment, the club head body 10 is made of titanium alloy or stainless steel. The front end of the club head body 10 has a front opening 11, the top of the club head body 10 forms a top opening 12, and one side of the club head body 10 has an upwardly extending shaft connection portion 13.

[0065] like Figures 1 to 3 as well as Figures 4 to 6 In the preferred embodiment shown, the front opening 11 includes a front opening section 111, a top opening section 112, and a bottom opening section 113. The top opening section 112 and the bottom opening section 113 extend rearward from the upper and lower ends of the front opening section 111 to the top and bottom of the club head body 10 with a predetermined width, respectively. That is, the top opening section 112 and the bottom opening section 113 are located at the top and bottom of the club head body 10 and connect the upper and lower ends of the front opening section 111. Figure 1 , Figure 2 and Figure 6 As shown, in this preferred embodiment, the bottom section 113 of the front opening 11 of the rod head body 10 may extend to the lower end adjacent to the rod connection portion 13.

[0066] like Figures 2 to 3 as well as Figures 5 to 6 As shown, the front end of the top opening 12 of the club head body 10 is adjacent to the rear side of the top section 112 of the opening, and the rear end of the top opening 12 extends to near the rear end of the club head body 10. A top cover support wall 121 is formed on the periphery of the top opening 12 of the club head body 10. The upper surface of the top cover support wall 121 is lower than the top surface of the club head body 10 and has a top cover mounting gap. The size of the top cover mounting gap matches the thickness of the periphery of the top cover component 30.

[0067] like Figure 5 , Figure 9 and Figure 10 As shown, a mounting hole 131 is formed in the rod connection portion 13 on one side of the rod head body 10. The mounting hole 131 can penetrate from the top of the rod connection portion 13 into the interior of the rod head body 10. The bottom of the rod head body 10 is provided with a fixing hole 132 corresponding to the vertical position of the mounting hole 131. In this preferred embodiment, the bottom section 113 of the front opening 11 of the rod head body 10 extends past the fixing hole 132 to the lower end adjacent to the rod connection portion 13.

[0068] like Figures 1 to 3 as well as Figures 4 to 9As shown, the striking component 20 is made of carbon fiber. The striking component 20 matches the front opening 11 of the clubhead body 10 and can be fixed at the front opening 11. The striking component 20 has a striking face 21, a top extension 22, and a bottom extension 23. The striking face 21 is a longitudinal plate. The top extension 22 and the bottom extension 23 extend laterally backward from the top and bottom of the striking face 21, respectively. The striking face 21 matches the front section 111 of the front opening 11, and the striking face 21, together with the front end of the clubhead body 10 located on the left and right sides of the striking face 21, forms a striking surface. The top extension 22 matches the top section 112 of the opening, and the bottom extension 23 matches the bottom section of the front opening 11. When the bottom section 113 of the opening 11 of the front opening of the clubhead body 10 extends past the fixing hole 132 to the lower end of the club connection 13, the bottom extension 23 of the striking component 20 can further extend to the lower end of the club connection 13.

[0069] like Figure 2 and Figure 3 as well as Figure 5 and Figure 6 In the preferred embodiment shown, the clubhead body 10 forms a striking portion support wall 114 around the periphery of the front opening 11. The outer surface of the striking portion support wall 114 is lower than the outer surface of the clubhead body 10, thus having a striking panel mounting spacing. The size of the striking panel mounting spacing matches the thickness of the periphery of the striking component 20. Thus, the two sides of the striking panel portion 21, the two sides and rear side of the top extension portion 22, and the two sides and rear side of the bottom extension portion 23 of the striking component 20 are all fixed to the striking portion support wall 114 around the front opening 11 of the clubhead body 10. In this preferred embodiment, the weight of the striking component 20 is controlled to be between 45 grams (g) and 55 grams (g). Preferably, the width A of the top extension portion 22 in the front-rear direction is 5 mm to 25 mm, and the width B of the bottom extension portion 23 in the front-rear direction is 5 mm to 25 mm.

[0070] like Figures 1 to 3 In the preferred embodiment shown, a top cover may be integrally formed on the top of the rod head body 10. For example... Figures 4 to 6 In the preferred embodiment shown, a top opening 12 may also be formed at the top of the clubhead body 10, and a top cover component 30 is fixed to the top opening 12 of the clubhead body 10. In order to effectively reduce the weight of the clubhead, the top cover component 30 is a component made of carbon fiber material or polymer material. The top cover component 30 matches the top opening 12 of the clubhead body 10 and can be fixed to the top opening 12 by adhesive bonding or mechanical bonding. In this preferred embodiment, the periphery of the top cover component 30 is fixed to the top cover support wall 121 around the top opening 12.

[0071] like Figures 4 to 6 As shown, the front end of the top opening 12 of the club head body 10 is adjacent to the rear side of the top section 112 of the opening, and the rear end of the top opening 12 extends to near the rear end of the club head body 10. A top cover support wall 121 is formed on the periphery of the top opening 12 of the club head body 10. The upper surface of the top cover support wall 121 is lower than the top surface of the club head body 10 and has a top cover mounting gap. The size of the top cover mounting gap matches the thickness of the periphery of the top cover component 30.

[0072] like Figure 3 and Figures 5 to 6 As shown, a counterweight mounting part 14 may be provided at the rear end or bottom of the rear section of the clubhead body 10, and a counterweight component 50 of high specific gravity metal material may be installed in the counterweight mounting part 14. That is, the specific gravity of the material of the counterweight component 50 is higher than that of the material of the clubhead body 10. The high specific gravity metal material may be tungsten nickel alloy (W-Ni) or the like. The counterweight component 50 is fixed in the counterweight mounting part 14 of the clubhead body 10.

[0073] like Figure 3 and Figures 5 to 6 As shown, in this preferred embodiment, the counterweight mounting portion 14 has a receiving recess 141 extending from the rear end of the rod head body 10 toward the interior of the rod head body 10. A sidewall is provided on the inner side of the receiving recess 141, and a screw hole 142 is provided in the sidewall. In this preferred embodiment, the counterweight component 50 includes a body 51 and a screw connection portion 52 provided on one side of the body 51. The counterweight component 50 is fixed by being screwed into the screw hole 142 of the counterweight mounting portion 14 using the screw connection portion 52, and the body 51 is located in the receiving recess 141 of the counterweight mounting portion 14.

[0074] like Figures 1 to 3 , Figures 4 to 6 and Figure 9 , Figure 10 As shown, a club connector 40 can be installed in the club connection portion 13 on one side of the clubhead body 10, allowing the golf clubhead to be assembled with a club via the club connector 40. The club connector 40 can be made of metal materials such as stainless steel, aluminum, aluminum alloy, titanium, or titanium alloy. The club connector 40 is installed in the mounting hole 131 of the club connection portion 13 and extends into the fixing hole 132, and is fixed to the bottom end of the club connector 40 in the clubhead body 10 by a screw 41 through the fixing hole 132. The screw 41 can be made of metal materials such as stainless steel, aluminum, aluminum alloy, titanium, or titanium alloy. In this preferred embodiment, the club connector 40 is made of aluminum alloy, and the screw 41 is made of stainless steel.

[0075] This invention relates to a golf club head with a carbon fiber striking face. Through the aforementioned integral construction, it utilizes a striking component and top cap made of carbon fiber material combined with a hollow club head body. The striking component, formed from lightweight and strong carbon fiber, has a C-shaped structure when viewed from the side. This allows the carbon fiber striking component to be fixed to the front end of the club head body via adhesive or mechanical bonding. This ensures necessary striking performance and strength, and allows the club to pass impact tests. Furthermore, it appropriately reduces the weight of the striking area at the front of the golf club head, increasing the weight margin of the club head body. Alternatively, by using carbon fiber for the top cap component (non-striking area) and making it thinner, the weight margin of the club head body and weight distribution components is further increased, contributing to the weight distribution design of the golf club head.

[0076] Furthermore, the carbon fiber forming striking component has a C-shaped structure when viewed from the side. In addition to maintaining the necessary strength and reducing weight, the carbon fiber striking component can also extend to the top and bottom of the front end of the clubhead body via the top and bottom extensions of the striking face. During impact, the force acting on the striking face of the carbon fiber striking component can be distributed and transmitted to the top and bottom of the clubhead body through the top and bottom extensions of the striking face. This gives the golf clubhead excellent hitting performance and effectively prevents the striking component from falling off due to excessive impact shear force.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A golf club head with a carbon fiber striking face, characterized in that, It includes: A hollow clubhead body, the front end of which has a front opening extending from the front side of the clubhead body to the top and bottom of the front end of the clubhead body, and one side of the clubhead body has an upwardly extending shaft connection portion; and A carbon fiber striking component is fixed in the front opening of the clubhead body. The striking component has a striking face, and a top extension and a bottom extension extending rearward from the top and bottom of the striking face, respectively. The striking face, combined with portions of the front side of the clubhead body located on the left and right sides of the striking face, forms a striking surface. The top and bottom extensions extend and are fixed to the top and bottom of the front end of the clubhead body, respectively, giving the striking component a C-shaped structure when viewed from the side. The front opening of the clubhead body includes a front section, a top section, and a bottom section. The front section is located on the front side of the clubhead body. The top and bottom sections are located at the top and bottom of the front end of the clubhead body, respectively, and are connected to the front section. The striking face portion matches the front section, the top extension portion matches the top section, and the bottom extension portion matches the bottom section. A striking part support wall is formed around the periphery of the front opening of the clubhead body. The outer surface of the striking part support wall is lower than the outer surface of the clubhead body, and has a striking face mounting spacing. The periphery of the striking component is fixed to the striking part support wall. The size of the striking face mounting spacing matches the thickness of the periphery of the striking component. Both sides of the striking face portion, both sides and the rear side of the top extension portion, and both sides and the rear side of the bottom extension portion of the striking component are fixed to the striking part support wall around the front opening of the clubhead body. The weight of the striking component is 45g to 55g.

2. The golf club head with a carbon fiber striking face according to claim 1, characterized in that, The clubhead body is made of titanium alloy or stainless steel. The width of the top extension of the striking part in the front-to-back direction is 5mm to 25mm, and the width of the bottom extension of the striking part in the front-to-back direction is 5mm to 25mm.

3. The golf club head with a carbon fiber striking face according to claim 1, characterized in that, The top of the clubhead body has a top opening, and a top cover component made of carbon fiber or polymer material is matched and bonded to the top opening of the clubhead body. A top cover support wall is formed around the top opening of the clubhead body. The upper surface of the top cover support wall is lower than the top surface of the clubhead body. The top cover component is fixed around the top cover support wall around the top opening.

4. The golf club head with a carbon fiber striking face according to claim 3, characterized in that, The clubhead body is made of titanium alloy or stainless steel. The width of the top extension of the striking component in the front-to-back direction is 5mm to 25mm. The width of the bottom extension of the striking component in the front-to-back direction is 5mm to 25mm. The front end of the top cover component is adjacent to the rear side of the top connection of the striking component, and the rear end of the top cover component is close to the rear end of the clubhead body.

5. The golf club head with a carbon fiber striking face according to claim 1, characterized in that, A mounting hole is formed in the shaft connection part of the club head body. The mounting hole extends from the top of the shaft connection part to the interior of the club head body. A fixing hole is provided at the bottom of the club head body, which corresponds to the vertical position of the mounting hole. A metal club connector is installed in the mounting hole of the shaft connection part. The club connector extends into the fixing hole, and the bottom end of the club connector is fixed to the club head body by a screw through the fixing hole.

6. The golf club head with a carbon fiber striking face according to claim 5, characterized in that, The cue connector is made of aluminum alloy, and the screw that secures the cue connector is made of stainless steel.

7. The golf club head with a carbon fiber striking face according to claim 5, characterized in that, The bottom section of the front opening of the clubhead body extends around the fixing hole to the lower end of the club connection, and the bottom extension of the striking component extends to the lower end of the club connection.

8. The golf club head with a carbon fiber striking face according to any one of claims 1 to 7, characterized in that, The rear end or bottom of the rod head body is provided with a counterweight device, in which a counterweight component made of high specific gravity metal is fixed.

9. The golf club head with a carbon fiber striking face according to claim 8, characterized in that, The counterweight mounting part has a receiving recess extending from the rear end of the rod head body toward the interior of the rod head body, and a side wall is provided on the inner side of the receiving recess, and a screw hole is provided in the side wall; the counterweight component includes a body and a screw connection provided on one side of the body, and the screw connection is screwed into the screw hole of the counterweight mounting part, and the body is located in the receiving recess of the counterweight mounting part.

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