JP2008054985A - Golf club head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf club head which is an improvement of a golf club head having a recess in a back portion thereof by connecting a plurality of members to each other, to thereby improve the appearance in the recess. <P>SOLUTION: In the head of a cavity back, which has the recess in the back portion by connecting a front surface member and a back surface member together, a connection portion between the front surface portion and the back surface portion is formed of a fixed portion to which both the members are fixed along an outer shell of the head, and an abutting portion located inside the fixed portion, on which both the front surface member and the back surface member abut. Then a projection covering a connection portion boundary between the front surface member and the rear surface member in the recess, is formed on the rear surface member. In the golf club head, the projection is arranged adjacently to the abutting portion. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a golf club head, and more particularly to a golf club head configured by joining a plurality of members.

In recent years, golf club heads (hereinafter referred to as “heads”) of irons have a hollow (opening in the back part) in the back part (back part) of the head for the purpose of stabilizing the directionality of the hit ball and expanding the sweet area. A so-called cavity back head provided with a portion) is widely known.
In order to secure the design freedom of this type of head, a method of forming a plurality of members such as a back member for forming a face member and a cavity back and joining them by welding or the like has been established.

FIG. 12 shows an iron head disclosed in Patent Document 1. This head 1 has a face member 5 provided with a face portion 3 and a back member 7 joined by welding to form a recess in a back portion 9 of the head 1. 11 is a cavity back structure.
In order to ensure the bonding strength between the face member 5 and the back member 7, a groove portion 13 is provided at the bonding portion between the face member 5 and the back member 7, and at least a part of the bonding portion is formed by the groove portion 13. In addition, a large groove portion 15 having a large depth and maximum width is formed, and a welding material is melted into the groove portion 13 and the large groove portion 15 to integrate them.

Thus, according to such a head 1, since the bonding strength between the face member 5 and the back member 7 can be ensured, vibration from interference of the gaps between the members 5 and 7 at the time of hitting is prevented. In addition, a good hitting sound and hit feeling can be obtained along with durability.
Further, in Patent Document 2, when a face member and a back member are joined by welding to form a cavity back head having a recess in the back portion, the joint strength is improved by infiltration of the weld bead, and the face There has been disclosed a head in which a bead reservoir concave portion is provided in a concave portion of a contact surface on the sole side of a member and a back member to improve an appearance defect due to infiltration of a weld bead.
JP 2004-202044 A JP 2002-369899 A

  However, in this type of golf club head in which a plurality of members are brought into contact with each other, such as the head 1 in FIG. 12, there is a junction boundary due to its structure. If the gap at the joint boundary between the face member 5 and the back member 7 becomes large, the gap is visually recognized from the outside, giving the user an impression that the joint strength is weak, and the appearance is not preferable.

On the other hand, in the head of Patent Document 2, there is a possibility that the weld bead may be visually recognized from the opening of the recess even if the recess for bead accumulation is provided in the recess, and polishing in the recess may be difficult. In addition, when the weld bead is visually recognized, there is a problem that the appearance is deteriorated.
However, in such a structure in which the weld bead is infiltrated, if the infiltration amount or infiltration location of the weld bead varies from head to head, the weight balance varies from head to head, and the designed head itself has a weight balance. There was also a risk of collapse.

  The present invention has been devised in view of such circumstances, and provides a head in which a plurality of members as described above are joined to improve a head in which a recess is formed in a back portion and an appearance in the recess is improved. With the goal.

  In order to achieve such an object, the invention according to claim 1 is directed to a cavity back head in which a front member and a back member are joined and a recess is provided in the back portion. Is composed of a fixed portion to which both members are fixed along the outer shell of the head, and an abutting portion that is located inward of the fixed portion and that contacts the front member and the rear member. A protrusion is provided to cover the boundary between the front member and the rear member in the recess.

  According to a second aspect of the present invention, in the head according to the first aspect, the projecting portion is provided adjacent to the abutting portion, and the invention according to the third aspect is provided. 3. The head according to claim 1, wherein the fixing portion is a groove portion formed at a boundary portion between the front member and the rear member along the outer shell of the head, and welded to the groove portion. It consists of a weld bead that melts the material and integrates the front member and the rear member.

According to the invention according to each claim, since the contact portion is provided inward of the fixed portion, infiltration of a weld bead or the like into the concave portion can be prevented, and as a result, the stability according to the design is maintained without breaking the weight balance. A golf club head can be manufactured.
The protrusion provided on the back member covers the boundary between the front member and the back member in the recess, and even if a weld bead or the like is infiltrated into the recess, the protrusion covers the weld bead and is visible from the outside. In order to make it impossible, the appearance was improved as compared with the prior art.

  Moreover, according to the invention which concerns on Claim 2, since the protrusion part was provided adjacent to the contact part, the positioning which made the protrusion part contact the edge part of a contact part at the time of joining of a front member and a back member can be performed. As a result, the joining accuracy is improved. As a result, a desired golf club head can be manufactured, and the manufacturing is facilitated.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an iron golf club equipped with a head according to an embodiment of claims 1 to 3. A head 23 is attached to the tip of a shaft 21 formed of fiber reinforced resin or metal, and the rear of the shaft 21 is shown. A grip 25 is attached to the end side to form an iron golf club 27. As is well known, the lie angle α of the golf club 27 is determined by the shaft axis S, and when the head 23 is set at a specified lie angle and loft angle, a reference horizontal plane P that is in contact with the sole portion 29 is set. .

  FIG. 2 is a front view of the head 23. In the figure, reference numeral 31 denotes a head body (front member) in which a hosel portion 33, a top portion 35, a sole portion 29, a face portion 37, etc. are integrally cast from an alloy such as titanium or stainless steel. 2, 5, and 6, a face side opening 39 is opened along the outer shape of the face portion 37, and a receiving portion (step portion) 41 is provided along the peripheral edge portion thereof. It has been.

The receiving portion 41 is engaged with a thin flat plate face plate 43 formed by forging an alloy such as titanium or stainless steel, and a joining portion with the receiving portion 41 is laser-welded. A face portion (ball striking face) 45 of the head 23 is formed so as to be flush with the face portion 37 of the main body 31.
The head main body 31 and the face plate 43 may be attached by other known means besides welding.

The back member 47 is integrally joined to the back side of the head main body 31 to form the head 23 according to the present embodiment.
As shown in FIGS. 3 and 5, the back member 47 is formed along the peripheral shape of the head body 31 using a metal material such as a tungsten alloy or a copper alloy having a specific gravity larger than that of the head body 31. The back side opening 49 has a ring shape with an opening.

  6 to 8, the back member 47 is joined to the back side of the head body 31, and is connected to the back portion 51 of the head 23 through the back-side opening 49. It has a cavity back structure in which an open hollow portion 53 is opened, and the inner surface of the back member 47 is formed so that the sole side is inclined obliquely downward toward the head body 31 from the toe side to the heel side. Thus, the concave portion 53 is a so-called undercut concave portion that is recessed in a concave shape from the back portion 51 of the head 23 to the sole side together with the inner surface of the head main body 31.

As described above, when the head 23 is formed by joining the ring-shaped back member 47 having a larger specific gravity than the head body 31 to the back side of the head body 31, the weight of the head 23 shifts to the peripheral portion. The overall moment of inertia increases and the directionality of the hit ball is stabilized.
Next, the joining structure of the head main body 31 and the back member 47 will be described. As shown in FIGS. 6 to 8, the joint between the head main body 31 and the back member 47 extends along the outer shell of the head 23. And a fixing portion 55 to which the back member 47 is fixed, and an abutting portion 57 that is located inside the fixing portion 55 and that contacts the head body 31 and the back member 47.

  Thus, the fixing portion 55 chamfers one or both of the boundary portions of the head main body 31 and the back member 47 along the outer shell of the head 23, and the cross-sectional view thereof faces the outer surface of the head 23. Grooves 59a and 59b formed so as to expand, and a weld bead 61 in which a welding material is melted into the grooves 59a and 59b and the head body 31 and the back member 47 are integrated. Is polished along the outside of the head body 31 and the back member 47.

  Then, a contact portion 57 in which the head main body 31 and the back member 47 abut on the inner side of the fixing portion 55 with a width (depth) equivalent to (preferably about twice) the depth of the fixing portion 55. Thus, when setting the depth of the fixing portion 55 that maintains the strength in this way, if the depth of the contact portion 57 is too large, the weight of the head increases and the degree of freedom in design is lost, which is too small. And the beads infiltrate. Thus, by providing such a wide contact portion 57 inside the fixing portion 55, the infiltration of the weld bead 61 into the concave portion 53 is prevented.

Further, in the present embodiment, in addition to the configuration in which the wide contact portion 57 is provided inside the fixing portion 55 to prevent the welding bead 61 from infiltrating into the concave portion 53, the back member 47 has a concave portion. A protrusion 65 that covers the joint boundary 63 between the head main body 31 and the back member 47 in the head 53 is provided adjacent to the contact portion 57.
As shown in FIGS. 5 to 9, the protrusion 65 is formed on the inner surface of the head body 31 with a dimension t of, for example, about 1 to 2 mm from the back side member 47 to the heel side from the toe side to the heel side. The protrusion 65 is formed so as to protrude in the direction of the face portion 37 along the protrusion portion 65, and the protrusion 65 is formed to be narrow in the direction of the top portion 35 of the head body 31.

And since the protrusion part 65 is provided adjacent to the contact part 57, while joining the head main body 31 and the back member 47, while positioning the contact part 57 end part to the protrusion part 65, and being possible, The protrusion 65 covers the joint boundary 63 between the head body 31 and the back member 47 in the recess 53 so that the gap between the joint boundaries 63 cannot be seen from the outside.
4 and 5, reference numeral 67 denotes a convex portion protruding from the sole portion 29 of the head body 31, and 69 denotes a concave portion provided at the bottom of the back member 47 corresponding to the convex portion 67. 67 is provided at the approximate center of the head body 31 in the toe and heel directions. By providing the convex portion 67 in the approximate center of the toe and heel directions in this way, the weight is distributed to the toe and heel sides, so The moment of inertia increases. Also, the behavior of the head at the time of hitting may be adjusted by forming convex portions and concave portions on the toe, heel side or one of them.

Further, as shown in FIG. 7, the contact surfaces of the head main body 31 and the back member 47 of the contact portion 57 are parallel to at least the top, the sole, and the toe in the vertical section Q with respect to the reference horizontal plane P. With such a structure, when the head main body 31 and the back member 47 are joined, they can be slid to adjust the manufacturing variation.
The head 23 according to the present embodiment is configured as described above, and has a structure in which the head 23 is formed by joining a ring-shaped back member 47 having a larger specific gravity than the head body 31 to the back side of the head body 31. The weight of the head 23 is shifted to the peripheral portion. As a result, the moment of inertia of the entire head 23 is increased and the directionality of the hit ball is stabilized.

Further, as described above, due to the structure in which the protruding portion 65 is provided adjacent to the contact portion 57, the end portion of the contact portion 57 is brought into contact with the protruding portion 65 when the head main body 31 and the back member 47 are joined. In addition to positioning, the wide contact portion 57 is provided inward of the fixed portion 55, so that the weld bead 61 is prevented from infiltrating into the concave portion 53.
Furthermore, as described above, the contact surfaces of the head main body 31 and the back member 47 of the contact portion 57 are parallel to at least the top, the sole, and the toe in the vertical section Q with respect to the reference horizontal plane P. Since the head main body 31 and the back member 47 are joined, they can be slid to adjust the manufacturing variation.

The protrusion 65 provided on the back member 47 covers the joint boundary 63 between the head body 31 and the back member 47 in the recess 53, and even if the weld bead 61 infiltrates into the recess 53, the protrusion 65 covers the weld bead 61 and is not visible from the outside.
Thus, according to this embodiment,
[1] Since the protruding portion 65 is provided adjacent to the abutting portion 57, when the head main body 31 and the back member 47 are joined, positioning can be performed by bringing the end portion of the abutting portion 57 into contact with the protruding portion 65. The joining accuracy is improved, and as a result, the desired head 23 can be manufactured, and the manufacture is facilitated.

[2] Since the wide contact portion 57 is provided inward of the fixed portion 55, it is possible to prevent the weld bead 61 from infiltrating into the concave portion 53. As a result, the stable head according to the design without breaking the weight balance. 23 can be manufactured.
[3] The protrusion 65 provided on the back member 47 covers the joint boundary 63 between the head body 31 and the back member 47 in the recess 53, and even if the weld bead 61 infiltrates into the recess 53, the protrusion 65 However, since it covers the weld bead 61 and cannot be visually recognized from the outside, the appearance is improved as compared with the conventional case.

  9 to 11 show a head according to one embodiment of claims 1 and 3, in which 71 is a hosel part 73, a top part 75, a sole part 77, a face part 79, etc. are made of titanium, stainless steel or the like. A head main body (front member) integrally cast with an alloy or carbon steel is replaced with the head main body 31 of FIG. It has a structure that is integrally molded with the.

Then, the back member 81 is integrally joined to the back side of the head body 71 to form the head 83 according to the present embodiment, and the shaft 21 is inserted into the hosel part 73 to form the iron golf club 85. ing.
As shown in FIGS. 10 and 11, the back member 81 of the present embodiment is also formed along the peripheral shape of the head body 71 using a metal material such as a tungsten alloy or a copper alloy having a specific gravity larger than that of the head body 71. A ring shape having a back side opening 87 opened substantially at the center is formed.

  Then, the back member 81 is joined to the back side of the head main body 71, and a concave portion (hollow portion that opens to the back portion 89) 91 opens in the back portion 89 of the head 83 through the back side opening portion 87. In this embodiment, the inner surface of the back member 81 is formed so that the sole side is inclined obliquely downward toward the head main body 71 from the toe side to the heel side, and the concave portion 91 is formed. Along with the inner surface of the head main body 71, an undercut concave portion is formed in a concave shape from the back portion 89 of the head 83 to the sole side.

Next, the joining structure of the head main body 71 and the back member 81 will be described. As shown in FIG. 10, in this embodiment, the joint between the head main body 71 and the back member 81 is formed on the outer shell of the head 83. A fixing portion 93 to which the head main body 71 and the back member 81 are fixed along, and an abutting portion 95 that is located inside the fixing portion 93 and contacts the head main body 71 and the back member 81.
Thus, the fixing portion 93 chamfers one or both of the boundary portions of the head main body 71 and the back member 81 along the outer shell of the head 83, and the cross-sectional view thereof faces the outer surface of the head 83. The groove portions 97a and 97b are formed so as to expand, and a weld bead 99 in which the welding material is melted into the groove portions 97a and 97b and the head body 71 and the back member 81 are integrated. An abutting portion 95 that abuts the head main body 71 and the back member 81 with a width (depth) comparable to the depth of the fixing portion 93 is provided inside the fixing portion 93. In this way, by providing the wide abutting portion 95 on the inside of the fixing portion 93, the welding bead 99 is prevented from infiltrating into the concave portion 91.

Further, similarly to the above-described embodiment, in this embodiment, a configuration in which a wide contact portion 95 is provided inward of the fixing portion 93 to prevent the welding bead 99 from infiltrating into the recess 91. In addition, the back member 81 is provided with a protruding portion 103 that covers the joint boundary 101 between the head main body 71 and the back member 81 in the recess 91.
Thus, as shown in FIGS. 10 and 11, the protruding portion 103 is provided to protrude over the entire circumference of the back member 81 along the back side opening 87 so as to cover the entire circumference of the joint boundary 101. However, unlike the protruding portion 65 of FIG. 6, the protruding portion 103 of this embodiment is not necessarily adjacent to the abutting portion 95, and the outer periphery of the protruding portion 103 so that a gap 105 is formed between the protruding portion 103 and the abutting portion 95. The diameter is set smaller than the inner peripheral diameter of the back side peripheral portion of the head main body 71.

In this embodiment as well, as shown in FIG. 10, the contact surfaces of the head main body 71 and the back member 81 of the contact portion 95 are parallel at least at the top, sole, and toe in the vertical section Q with respect to the reference horizontal plane P. With such a structure, when the head main body 71 and the back member 81 are joined, they can be slid to adjust the manufacturing variation.
Since the head 83 according to the present embodiment is configured as described above, the head 83 is formed by joining the ring-shaped back member 81 having a larger specific gravity than the head body 71 to the back side of the head body 71. As a result, the weight of the head 83 is shifted to the periphery, and as a result, the inertia moment of the entire head 83 is increased and the directionality of the hit ball is stabilized.

  Further, as described above, the contact surfaces of the head main body 71 and the back member 81 of the contact portion 95 are configured to be parallel at least at the top, sole, and toe in the vertical section Q with respect to the reference horizontal plane P. Further, the outer peripheral diameter of the protrusion 103 is set smaller than the inner peripheral diameter of the back side peripheral portion of the head main body 71 so that a gap 105 is formed between the head main body 71 and the back member. When the 81 is joined, both of them can be slid to adjust the manufacturing variation, and the wide contact part 95 is provided inward of the fixing part 93, so that the welding bead 99 is prevented from infiltrating into the concave part 91. It will be.

The protrusion 103 provided on the back member 81 covers the entire boundary of the joint portion 101 between the head body 71 and the back member 81 in the recess 91, and the weld bead 99 infiltrates into the recess 91. However, the protrusion 101 covers the weld bead 99 and cannot be visually recognized from the outside.
Therefore, according to this embodiment,
[1] Since the wide contact portion 95 is provided inward of the fixed portion 93, it is possible to prevent the weld bead 99 from infiltrating into the concave portion 91. As a result, the stable head according to the design without breaking the weight balance. 83 can be manufactured.

[2] The protrusion 103 provided on the back member 81 covers the joint boundary 101 between the head main body 71 and the back member 81 in the recess 91 over the entire circumference, and the weld bead 99 is infiltrated into the recess 91 temporarily. Even so, the protrusion 101 covers the weld bead 99 and cannot be visually recognized from the outside, so that the appearance is improved as compared with the conventional case.
In each of the above-described embodiments, the back members 47 and 81 are formed in a ring shape along the periphery of the head main bodies 31 and 71. However, like the back member 7 in FIG. It may be a back member to be attached.

Moreover, although each embodiment mentioned above formed by welding the fixing | fixed part 55 and 93, it is good not only by welding but brazing or adhesion | attachment, for example.
Furthermore, it is possible to combine the configurations of the respective embodiments. For example, the protruding portion 103 in FIGS. 9 to 11 protrudes over the entire circumference of the back member 81, but instead of such a configuration, FIG. Similarly to the protruding portion 65, it may be formed on the sole side from the toe side to the heel side.

4 is a front view of an iron golf club equipped with a head according to an embodiment of the present invention. FIG. FIG. 4 is a front view of a head according to an embodiment of claims 1 to 3. It is a rear view of a head. It is a bottom view of a head. It is a disassembled perspective view of a head. It is the VI-VI sectional view taken on the line of FIG. It is the VII-VII sectional view taken on the line of FIG. It is the VIII-VIII sectional view taken on the line of FIG. It is a front view of the head concerning one embodiment of Claim 1 and Claim 3. FIG. 10 is a sectional view taken along line XX in FIG. 9. It is a disassembled perspective view of a head. It is a rear view of the conventional head.

Explanation of symbols

21 Shaft 23 Head 27 Golf club 29 Sole portion 31 Head body 35 Top portion 37, 45 Face portion 39 Face side opening portion 41 Receiving portion 43 Face plate 47 Back member 49 Back side opening portion 51 Back portion 53 Recess portion 55 Fixing portion 57 Contact part 59a, 59b Groove part 61 Weld bead 63 Joining part boundary 65 Protrusion part

Claims (3)

In the golf club head of the cavity back which joined the front member and the back member and provided the concave part in the back part,
The joint between the front member and the back member is a fixed portion where both members are fixed along the outer shell of the golf club head, and a contact where the front member and the back member abut on the inside of the fixed portion. And composed of parts,
A golf club head, wherein the back member is provided with a protrusion that covers a boundary between the front member and the back member in the recess.   The golf club head according to claim 1, wherein the protruding portion is provided adjacent to the contact portion. The fixing portion integrates the front member and the back member by melting a groove portion formed at the boundary portion between the front member and the back member along the outer shell of the golf club head, and a welding material into the groove portion. The golf club head according to claim 1, comprising a weld bead.

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