JP3056415U - Weight fixed golf club head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf club head having a low center of gravity by fixing a tungsten weight body having a high specific gravity to a sole portion made of a titanium alloy at a low cost. SOLUTION: A sole portion 2 of a golf club head body 1 is provided.
A weight body 3 of a different metal having a large specific gravity is accommodated in a rising portion 4 formed in a part of the weight body, and the weight body is fixed to the rising portion 4 by a flange 6 formed by welding. Fixed golf club head.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an iron or wood type golf club head having a low center of gravity.

[0002]

[Prior art]

 In general, golf club heads require a club with a low center of gravity in order to make it easy for the ball to rise and hit easily.However, in a club in which the entire head is made of the same kind of metal, the center of gravity of the head is greatly increased. There are limits to lowering. Thus, as shown in FIG. 1, in the case of a golf club head, the weight body 3 is fixed to the sole portion 2 of the club head body 1 by pressing, and the weight body 4 is fixed by means such as mechanical connection or welding. Embedding is proposed. In addition, in FIG. 1, the sole portion 2 is formed integrally with the head body 1, and a method of manufacturing the sole portion 2 separately from the head body 1 and welding it to the bottom of the head body 1 is also actually performed. Have been done. For example, Japanese Unexamined Patent Publication No. Hei 5-245324 discloses that a head body made of titanium or a titanium alloy and a weight body heavier than the specific gravity of the head body are attached to the sole portion of the head body by using a precision casting method. A club head having a provided structure is disclosed. Japanese Patent Application Laid-Open No. Hei 10-94623 discloses that the sole portion of the club head body and the weight body are made of dissimilar metals in order to lower the center of gravity and increase the moment of inertia. In order to solve the problem that a joint having a specific gravity cannot be formed, mechanical joining, that is, a press-fitting portion of a weight body of a dissimilar metal having a specific gravity of 10 or more is formed on the sole portion, or a spacer made of the same metal as the sole portion is used. A club head is disclosed in which a sole and a weight or spacer are engaged by mechanical means by press-fitting or tightening, and a pin or spacer penetrating the sole is welded to the sole to form an integral structure. Have been. Further, Japanese Patent Application Laid-Open No. H08-123804 discloses an iron club head in which a plurality of weight screw members having a higher specific gravity than the head body are detachably attached to the peripheral portion of the head body at equal intervals from the toe side to the heel side. Is disclosed.

[0003]

[Problems to be solved by the invention]

 However, there are various problems in the golf club as shown in the above-mentioned prior art. For example, the method disclosed in JP-A-5-245324 requires a complicated process of precision casting using a lost wax method in which a weight body is inserted and set in advance, injection molded, and then a coating layer is formed. It is. Also, in the methods disclosed in JP-A-10-94623 and JP-A-8-123804, since a method called mechanical joining is adopted, the joints are loosened due to shock, vibration, etc. during use. As a result, the function as a golf club is deteriorated, and in addition, there is a problem that the user is uncomfortable. For this reason, there has been a demand for the development of a golf club that is simpler, can be manufactured at low cost, and can have a low center of gravity.

[0004]

[Means for Solving the Problems]

 The present invention has been made in order to solve the above-mentioned various problems, and it is a simpler method, and at a low cost, the weight of the dissimilar metal is securely fixed to the sole portion to reduce the center of gravity. A golf club can be provided, and the gist is as follows. 1) A weight body 3 of a different metal having a large specific gravity is accommodated in a rising portion 4 formed on a part of the sole portion 2 of the golf club head body 1, and the weight 6 is formed by a flange 6 formed by welding to the rising portion 4. A weight fixed golf club head, wherein the body 3 is fixed.

[0005] 2) The weight body according to the above 1), in which concave portions 7, 8 for forming a flange 6 formed by welding, or only the concave portions 8 are formed at positions of the rising portion 4 and the weight body 3 facing each other. Fixed golf club head. 3) The weight according to the above 1) or 2), wherein the specific gravity of the material of the sole portion 2 is 5.0 or less, and the specific gravity of the heavy metal 3 of a different metal having a large specific gravity is 7.0 or more. Golf club head with fixed body.

[0006] 4) The material of the sole portion 2 is a titanium material, and the weight body 3 of the dissimilar metal having a large specific gravity is a tungsten alloy. The weight fixed golf club head according to the paragraph. 5) The material of the sole portion 2 is an aluminum alloy, and the weight body 3 of the different metal having a large specific gravity is a copper alloy or a tungsten alloy. A weight fixed golf club head according to any of the above items.

[0007]

[Embodiment of the invention]

 Next, an embodiment of the present invention will be described with reference to the drawings. The present inventors have conducted various experiments to produce a golf club having a low center of gravity by securely fixing a weight body such as tungsten to the sole portion at low cost. FIG. 2 is a partially enlarged cross-sectional view of a sole portion 2 cast from a 6Al-4V titanium alloy. A circular hole portion 10 having a diameter of 15 mm formed in a part of the sole portion 2 and an inner diameter of 18 mm are provided. A weight body 3 having a large specific gravity, such as a tungsten alloy, is housed in a cylindrical rising section 4 having a diameter of 28 mm, and a step 9 of the weight body 3 is pressed into the hole 10 with a pressing force of 5 tons. Then, the tip 5 of the rising portion 4 was caulked to the upper part of the periphery of the tungsten weight 3 using a caulking mold with a pressing force of 15 tons, and the weight 3 was fixed to the sole portion 2 in the experimental example. It is an example of a weight fixed golf club head.

However, in the above-mentioned experimental example, there is a problem that the crimping bent portion b of the crimping portion a buckles and cracks occur, making it impossible to securely fix the weight body. This is due to the fact that the club head is made of titanium alloy and is a cast product, so that it is fragile to bend. In addition to the above problem, even when the sole portion is made of an aluminum alloy or the like other than the titanium alloy, there is a disadvantage that a crack is easily formed when the sole portion is strongly caulked. On the other hand, if the caulking is weakened to prevent the occurrence of cracks, a gap will be created between the weight body and the caulking part due to springback, which will cause looseness, incomplete fixing of the weight body, and unpleasant noise. There is a disadvantage that it occurs.

FIG. 3 shows a partially enlarged cross-sectional view of the sole portion 2 as an embodiment of the weight fixed golf club head according to the present invention. In FIG. 3, a circular hole portion 10 having a diameter of 15 mm and a cylindrical rising portion 4 having an inner diameter of 18 mm formed in a part of a sole portion 2 cast from a 6Al-4V titanium alloy are formed. A weight body 3 of a different metal having a large specific gravity, such as a tungsten alloy, is accommodated in 4 and a step 9 of the weight body 3 is press-fitted into the hole 10 with a pressing force of 5 tons. The other portion 11 of the weight 3 is accommodated in the rising portion 4 with a gap of about 0.1 mm. In addition, a flange 6 formed by welding titanium is formed on the tip 5 of the rising portion 4 and the upper portion of the periphery of the weight 3 of a dissimilar metal having a large specific gravity such as a tungsten alloy, and the weight 3 is fixed in the rising portion 4. The sole part 2 to which the weight body 3 is attached is formed. In the present invention, the material of the head body 1 and the sole portion 2 is preferably a titanium alloy such as 6Al-4V having a specific gravity of about 4.5, an aluminum alloy having a specific gravity of about 2.7, or the like. The material of the weight body 3 of the dissimilar metal having a large specific gravity with respect to the sole portion 2 has a specific gravity of about 7. It is preferable to use a stainless steel having a specific gravity of about 8, a copper alloy having a specific gravity of about 8, a tungsten alloy having a specific gravity of 13 to 18, or the like.

Further, when the rising portion 4 and the weight body 3 are welded at opposing positions, the welding rod used for welding is made to correspond to the material of the sole portion 2. If an alloy is used, a titanium welding rod is used, and if the material of the sole portion is an aluminum alloy, an aluminum welding rod is used, which is advantageous in terms of joining strength and weldability. Further, a flange 6 which is firmly integrated is formed in the rising portion 4 by welding using a welding rod of the same material. The weight body 3 of the dissimilar metal is not welded, but the flange 6 formed by welding is tightly fixed without any gap.

Further, since the rising portion 4 and the weight body 3 are formed with concave portions 7 and 8 for overlay welding at respective opposing positions, the weld metal flows or overflows during welding. I won't go out. On the other hand, the material of the weight body 3 is preferably a material having a higher melting point than the material of the sole portion 2 so as not to melt at the time of welding flange. For example, for a sole portion of an aluminum alloy having a melting point of about 600 ° C., a copper alloy (melting point of about 1000 ° C.) or a tungsten alloy (melting point of about 3000 ° C.) is used. By using a tungsten alloy heavy body for the portion, there is no burn-through during welding between the sole part 2 and the heavy body 3 and a strong welding strength can be obtained. Further, as shown in FIG. 4, the rising portion 4 can be made higher with respect to the weight body 3 and the flange 6 can be formed by welding. Further, as shown in FIG. 5, the concave portion can be formed only in the weight body.

The present invention described with reference to FIGS. 3, 4 and 5 can be used for a wood club head and an iron club head, or a putter. Further, the fixing position of the weight body 3 with respect to the sole portion 2 is arbitrary, but taking the case of the club head shown in FIG. 1 as an example, the weight body 3 is moved relative to the position shown in FIG. When the weight body 3 is located closer to the back 13, the center of gravity is further lowered, and when the weight body 3 is positioned closer to the back 13, the center of gravity slightly increases, but the depth of the center of gravity can be increased. Further, the weight body 3 can be positioned closer to the toe direction or the heel direction, and the weight body 3 can be fixed at two positions closer to the toe direction and closer to the heel direction.

[0013]

[Effect of the invention]

 As described above, according to the present invention, the flange formed by the welded portion of the same material as the sole portion is firmly welded to the rising portion and can be closely attached to the upper portion around the weight body without any gap. It has the advantage that it does not buckle like caulking. In addition, a golf club head having a low-gravity center portion that can securely and firmly fix a weight body of a dissimilar metal having a large specific gravity in a rising portion and prevent unpleasant noise generated during use of the club. It is possible to do.

[Brief description of the drawings]

FIG. 1 is a view showing the entirety of a golf club head of a weight embedded type.

FIG. 2 is a partially enlarged cross-sectional view of a golf club head having an embedded tungsten weight body of an experimental example.

FIG. 3 is a partially enlarged cross-sectional view of a heavy tungsten welding type golf club head according to the present invention;

FIG. 4 is a partially enlarged sectional view of a tungsten weight welding type iron club head according to another embodiment of the present invention;

FIG. 5 is a partially enlarged sectional view of a tungsten weight welding type iron club head according to still another embodiment of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Golf club head main body 2 ... Sole part 3 ... Weight body 4 ... Rising part 5 ... Tip of rising part 6 ... Flange 7, 8 ... Depression 9 ... Step part of weight body 10 ... Void part 11 ... Others of weight body Part 12: Face 13: Back a: Caulking part b: Bending part

Claims (5)

[Utility model registration claims] 1. A sole portion 2 of a golf club head body 1.
A weight body 3 made of a dissimilar metal having a large specific gravity is accommodated in a rising portion 4 formed in a part of the weight portion, and the weight body 3 is fixed to the rising portion 4 by a flange 6 formed by welding. Body fixed golf club head. 2. The weight body according to claim 1, wherein recesses 7, 8 or only recesses 8 for forming a flange 6 formed by welding are formed at positions of the rising portion 4 and the weight body 3 facing each other. Fixed golf club head. 3. The specific gravity of the material of the sole portion 2 is 5.0 or less, and the specific gravity of the weight body 3 of a different metal having a large specific gravity is 7.0.
The weight fixed golf club head according to claim 1 or 2, wherein: 4. The material according to claim 1, wherein the material of the sole portion is a titanium material, and the weight body of a different metal having a large specific gravity is a tungsten alloy. 6. The golf club head according to claim 1, wherein 5. The method according to claim 1, wherein the material of the sole portion is an aluminum alloy, and the weight body of a different metal having a large specific gravity is a copper alloy or a tungsten alloy. A weight fixed golf club head according to any of the above items.