JPH037178A - Golf club head - Google Patents

Abstract

PURPOSE:To provide a head of golf club which is hard, has a high modulus of elasticity, and excels in the vibratory suppressing characteristic, by forming the face of the head body in two-layer structure composed of a striking surface, which is formed from a vibro-suppressive alloy having a tensile strength over a specified value, and a resin layer made of visco-elastic highpolymer tightly adhered to the rear side of the mentioned striking surface. CONSTITUTION:In the head of a wood club according to the existing invention, the face 5 of the head body 1 is formed in two-layer structure composed of a striking surface A, which is made of a vibro-suppressive alloy having a tensile strength over 60kg/mm<2>, and a resin layer B made of visco-elastic highpolymer tightly adhered to the rear side of the mentioned striking surface A. A tensile strength below 60kg/mm<2> is too soft and can not offer a desired repulsive coefficient. Examples of such a vibro- suppressive alloy are Mn-Cu alloy, Cu-Al-Ni alloy, Cu-basis shape memory alloy, a shape memory alloy of Ti-Ni series, Ni-Co alloy, Fe-Cr alloy, ferrite stainless steel copper, and SUS 304 either solely or in a combination thereof. Their strengths are as high as between 60-140kg/mm<2>, and the internal friction ranges 30-60X10<-3>, providing satisfactory vibration suppressing performance, but for further enhancement of it, the resin layer B consisting of visco-elastic highpolymer is adhered to the rear side of the striking surface A.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a head for a golf club, and is suitable for, for example, a head for a metal wood club.

(Prior Art) Various improvements have been made in the past in order to increase the flight distance of a batted ball. The idea in this case is to improve the coefficient of repulsion with the ball, and the main idea is to use a material with a high modulus of elasticity for the head (see Japanese Patent Publication No. 59-53059).

(Technical issue) However, if materials with high hardness and elastic modulus are used, much of the energy of the collision is released in the form of vibrations and sounds, and it is understood that this does not necessarily reflect on the flight distance. This suggests the use of materials that not only have high hardness and elastic modulus (but also have properties that make it difficult for collision energy to be dissipated in various ways).

An object of the present invention is to solve the conventional problems and provide a golf club head that is hard, has a high modulus of elasticity, and has excellent vibration damping performance.

(Technical Means) The object is to provide at least two layers of a striking surface made of a vibration-proofing alloy with a tensile strength of 60 kg/mm or more, and a resin layer made of a viscoelastic polymer closely adhered to the back side of the striking surface. This is achieved by forming the face of the head body with the two-layer structure.

The reason why the tensile strength is set to 60 Kg/ml11" or more is because if it is less than that, it is too soft and the desired coefficient of restitution cannot be obtained.

In addition, examples of anti-vibration alloys having this tensile strength include: Cu-11, which is an Mn-Cu alloy (manganese bronze);
13Mn-2Fe (resistin), Cu-12~13
Mn-2Ni (manganin), ・Cu-10A16 Ni, which is a Cu-Al-Ni alloy
-4Fe-Mn or Cu-8~12Al-0,5~2
Ni-2~5 Fe-0,5~2Mn (Arms Bronze), Cu-Al-Ni-Mn-T, which is a copper-based shape memory alloy
i, Cu- of Cu-Zn-A1 alloy and Cu-Ni alloy
・Ti-Ni-based shape memory alloys such as 4ONi (4
9-51) N1-TL, ・Ni-Co alloy (trade name, Dientalloy N-1) ・F
e-Cr alloy (product name, Dientalloy F-2), ferritic stainless steel (product name, Silentalloy, Trancaloy, etc.) - SuS whose surface is intergranularly corroded with non-magnetic austenite
304, - Iron-based shape memory alloy such as Fe-Ni-Co-Ti alloy,
Fe-Mn-C alloy, one or more selected from the alloys listed above can be used.

These alloys have a high strength of 60 to 140 Kg/am'' and an internal friction (damping capacity) of 30 to 6 oxio-', so they have good vibration isolation 1jF, but in order to further improve the vibration isolation performance, A resin layer made of a viscoelastic takako is provided on the ringing side of the 5-stroke 1m pitch.

The oily substance is made of boxy resin, 1. It is made of tan resin, polyamide resin, polyamide resin, polyethylene resin, etc. Note that the resin layer is adhered to the back surface of the hitting surface by means such as hot melting or adhesion, but the minimum combination is a two-layer structure of the hitting surface and the resin layer on the back side. .

Therefore, you are free to combine other materials based on your structure.

(Example) A description will be given below with reference to the drawings. Fig. 1 conceptually shows the structure of the face portion of the head according to the present invention, in which the outer hitting surface A is made of a vibration-proofing alloy, and the inner (sealing layer B) is made of a viscoelastic polymer. All of the following examples have at least this Slj? structure, but the material, shape, and structure of the head body 1 are free. See FIG. 10.

Fig. 2 shows a head for a metal wood club, and the main body 1 forming the outer shape of the head is formed into a hollow shell shape using a vibration-proof alloy by the lost wax method or other casting method. ing. See Figure 11. On the hollow inner surface of the cast head body 1 (i), a resin N2 made of a viscoelastic polymer is formed with a substantially uniform thickness.Furthermore, the inner core is filled with a hard foamed resin 3. (
(Fig. 3), the face 5 is already formed on the head body 1 when it is cast, and the shaft attachment part 4 is also integrally formed, so all that is left is to finish the head body 1 such as wrapping. That's fine.

FIG. 4 shows an example in which the face 5 is provided with a separate insert 10, and the insert 10 is an insert made of a high-strength vibration-proofing alloy or a medium-strength vibration-proofing alloy that is the same as that of the head body 1. It is formed by a face 11 and a resin plate 12 made of viscoelastic polymer interposed between the face 11 and the head body 1 (FIG. 12). Extra-super duralumin or the like can be used as the medium-strength anti-vibration alloy. The insert face 11 has a U-shaped cross section, into which the resin plate 12 is fitted, and both members are integrally fitted into the recess 6 formed in the face portion of the head body 1 and fixed. has been done. The resin layer 2 is formed inside the head main body 1 in the same manner as described above, but it may be filled with foamed resin or may remain hollow.

FIG. 5 shows this applied to an iron head, with a recess 22 on the face of the iron head body 21.
is formed, and a two-layer structure C consisting of a striking surface A made of an anti-vibration alloy and a layer B made of a viscoelastic resin is fixed thereto. See Figure 13.

In the example in Figure 6, insert 10 is inserted into insert face 11.
Although the head body 1 is formed from a conventionally used metal material for heads, FIG.
An example in which hard foamed resin 3 similar to the example shown in the figure is filled is shown.

Furthermore, in FIG. 8, a hollow shell 31 is formed using a conventional metal material for heads, and its bottom surface is covered with viscoelastic resin IIB (the outer surface is coated with viscoelastic resin IIB), and the outer surface except for the bottom surface and face is covered with viscoelastic resin IIB. It is coated with a high-strength synthetic resin E and has a hitting surface A made of a vibration-proofing alloy formed on the face.

Furthermore, the structure in which the vibration-proofing alloy and the resin layer are stacked requires at least two layers, and it may be formed into three or more layers as shown in FIG. 9 (such a multilayer structure The head structure using this can be implemented in the same manner as the examples shown in FIGS. 1 to 8.

(Function) The present invention is constructed as described above, and although the head is entirely or mostly made of metal and the face that actually contacts the ball is also located in front of the metal, the metal is vibration-proof. Since it is made of an alloy, the energy of the collision when the ball is hit is due to contact with a metal with high tensile strength, but it hardly changes to vibration, so the repulsion coefficient (
elastic modulus) is maintained high. Moreover, vibrations are also suppressed by the resin layer made of viscoelastic polymer that is closely adhered to the inside of the head body, so that the energy of the collision is less likely to be dissipated.

(Effects) Therefore, according to the present invention, even if the wall thickness of the head body is thin (even if the head body has good vibration-proofing performance, it can be made lighter and can also be made into a top-shaped body, and the outer shape can be made high-strength and vibration-proof. Since it is an alloy, there is no risk of damage, and on the other hand, if the outer shape is the same as the conventional one, the amount of alloy used can be reduced, which has the advantage of being able to be provided at a low cost.In particular, the product of the present invention is hard and has a high modulus of elasticity. At the same time, since it is difficult to generate vibrations, the impact energy can be directly converted into repulsion, resulting in significant effects such as significantly extending flight distance.

[Brief explanation of the drawing]

The drawings show a golf club head according to the present invention; FIG. 1 is a sectional view of the first embodiment, FIG. 2 is a sectional view of the second embodiment, and FIG. 3 is a sectional view of the third embodiment. FIG. 4 is a sectional view of the fourth embodiment, FIG. 5 is a sectional view of a modification of FIG. 4, FIG. 6 is a sectional view of the fifth embodiment, and FIG. 7 is a sectional view of the sixth embodiment.
Figure 8 is a sectional view of the seventh embodiment, Figure 9 is a sectional view of the eighth embodiment, Figure 1θ is a perspective view of the head body with a bonded face, and Figure 11 is a head with an integrated face. FIG. 12 is a perspective view of the main body, FIG. 12 is a perspective view of a head having an insert face, and FIG. 13 is a perspective view of an iron head. l...Head body, 2...Resin layer, 5...Face.

Claims (1)

[Scope of Claims] (1) At least two balls comprising a striking surface made of a vibration-proofing alloy having a tensile strength of 60 kg/mm^2 or more, and a resin layer made of a viscoelastic polymer closely adhered to the back side of the striking surface. 1. A head for a golf club, characterized in that the head has a layered structure, and the face of the head body is formed by the two-layered structure. (2) The head body is formed into a predetermined shape by any material used for the head, and the two-layer structure is bonded to the entire face of the head body. Head for golf club. (3) Claim 1, wherein the head body is formed into a predetermined shape from any material used for the head, and a two-layer structure is inserted into a part of the face of the head body. The head for a golf club described in Section 1. (4) The head body itself has a tensile strength of 60Kg/mm^2
2. A golf club head according to claim 1, which has a hollow structure made of the above-mentioned vibration-proofing alloy, and a resin layer made of a viscoelastic polymer is adhered to the hollow inner surface. (5) The head for a golf club according to claim 1 or 4, wherein the head body is hollow, and the hollow interior is filled with a hard resin foam. (6) Anti-vibration alloy is Mn-Cu alloy, Cu-Al-Ni
alloy, copper-based shape memory alloy, Ti-Ni shape memory alloy,
Iron-based shape memory alloy, Ni-Co alloy, Fe-Cr alloy,
2. The golf club head according to claim 1, which is made of one or more selected from ferritic stainless steel and SUS304. (7) The resin layer is made of epoxy resin, urethane resin, polyester resin, polyamide resin, polyethylene resin, etc., and has a thickness of 0.02 to 3 mm.
The head for a golf club described in Section 1.