JP5175688B2 - Iron type golf club head - Google Patents

Description

  The present invention relates to an iron type golf club head in which a face member and a head body are fixed, and more specifically, by changing the width of the receiving portion of the head body that supports the back surface of the face member, the flying distance and directionality of the hit ball can be increased. The present invention relates to an iron type golf club head that can be improved.

  FIG. 7A is a front view of a conventional iron-type golf club head b, and FIG. 7B is a cross-sectional view taken along line AA. The golf club head b is formed by fixing a face member c formed of a different material and a head body d (see, for example, Patent Document 1 below).

  The head body d is provided with an opening O penetrating in the front-rear direction and a face receiving part f formed around the opening O. The face receiving portion f includes an inner peripheral surface portion f1 that supports the outer peripheral surface e1 of the face member c, and a receiving surface f2 that supports the peripheral portion of the back surface e2 of the face member c and that is annularly continuous with a substantially constant width W. The cross section is formed in a substantially step shape.

JP 2001-29523 A

  In such an iron-type golf club head b, in order to increase the flight distance of the hit ball, the area of the face member c that is not in contact with the head main body d is increased, and the face member c is larger at the time of hitting the ball. It is effective to improve so as to bend (elastically deform). In particular, since the face member c has a horizontally long shape, it is effective to increase the vertical dimension of the opening O in order to make it easier to bend.

  On the other hand, the iron type golf club head integrally has a hosel part g which is a heavy object on the heel side. For this reason, increasing the weight on the toe side can effectively increase the moment of inertia related to the center of gravity of the head. In such a club head, the head blur at the time of a miss shot is small, and the directionality of the hit ball is improved.

  Further, by increasing the weight on the toe side, the moment of inertia of the club head with respect to the shaft axis center line is also increased. Such a club can increase the initial velocity of the hit ball and increase the flight distance.

  The present invention has been devised in view of the above situation, and the average width of the toe side portion of the receiving surface that supports the peripheral portion of the back surface of the face member is relatively increased, and the top of the receiving surface is provided. The main object is to provide an iron type golf club head capable of improving the flight distance and directionality of a hit ball on the basis of reducing the average width of the side portion and the average width of the sole side portion.

The invention according to claim 1 of the present invention is an iron type golf club head including a face member constituting at least a part of a face for hitting a ball, and a head body to which the face member is fixed on the front side. The head body has an opening that does not contact the back surface of the face member, and a face receiving portion is provided around the opening, and the face receiving portion supports the outer peripheral surface of the face member. And a receiving surface that protrudes from the inner peripheral surface portion toward the head center side and supports the peripheral edge portion of the back surface of the face member, and the receiving surface is a top side portion extending from the head upper side, the head A sole side portion extending on the bottom side, a toe side portion connecting the top side portion and the sole side portion on the head tip side, and a space between the top side portion and the sole side portion. With an annular having a heel sides connected by Lumpur side, and satisfies the following formula.
Wt> Wc
Wt> Ws
Wc> Wh
Ws> Wh
However, the symbols are as follows.
Wt: Average width of the toe side of the receiving surface Wc: Average width of the top side of the receiving surface Ws: Average width of the sole side of the receiving surface
Wh: Average width of the heel side of the receiving surface

The invention according to claim 2 is the iron type golf club head according to claim 1, wherein the receiving surface has an average width Wc of the top side portion and an average width Ws of the sole side portion satisfying the following formula .
Ws> Wc

The invention according to claim 3, toe side portion of the receiving surface, the average width Wt2 of the lower half, an iron type golf club head according to claim 1 or 2 larger than the average width Wt1 of the upper half is there.

In the golf club head of the present invention, the periphery of the back surface of the face member is supported by the receiving surface of the head body. The receiving surface has an average width on the top side and an average width on the sole side toe side. It is formed to be relatively smaller than the average width. As a result, it is possible to ensure a large vertical dimension of the opening that does not contact the back surface of the face member, making the face member easy to bend and increasing the flight distance. Further, the receiving surface is formed so that the average width of the toe side portion is relatively large, so that the toe side weight of the head can be increased. As a result, the moment of inertia related to the center of gravity of the head of the club head or the center line of the shaft axis increases, and the directionality and initial velocity of the hit ball are improved. Further, by configuring the average width of the heel side to be the smallest in the receiving surface, the moment of inertia of the club head with respect to the shaft axis center line is increased, and as a result, the directionality and initial velocity of the hit ball can be improved.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a reference state in which an iron type golf club head 1 of the present embodiment is held at a specified lie angle α and loft angle β (the loft angle β is shown in FIG. 3) and is grounded to a horizontal plane HP. FIG. 2, FIG. 2 is a rear view of FIG. 1, FIG. 3 is an AA enlarged end view of FIG. 1, and FIG. 4 is an exploded perspective view of an iron type golf club head before assembly.

  An iron type golf club head (hereinafter, also simply referred to as “club head” or “head”) 1 according to this embodiment includes a head base 1A and a hosel portion 1B.

  The head base 1A is defined by a face F which is a surface for hitting a ball, a back face Bf which is an opposite surface thereof, and a head outer peripheral surface P which connects between them. The head outer peripheral surface P includes a top surface Tb extending from the upper edge of the face F to the rear of the head and forming the upper surface of the head, a sole surface So extending from the lower edge of the face F to the rear of the head and forming the bottom of the head, and the top surface Tb. And a toe surface To connecting the sole surface So.

  The hosel portion 1B has a cylindrical shape in which a shaft insertion hole h is formed, and is connected to the heel side of the head base 1A and extends upward. A shaft (not shown) is attached to the shaft insertion hole h. The shaft center line CL of the shaft insertion hole h is used as a substitute for the shaft center line of the shaft when the head 1 is held in the reference state.

  The head 1 includes a face member 2 that constitutes at least a part of the face F (main part in the present embodiment), and a head body 3 to which the face member 2 is fixed on the front side. That is, the club head 1 of this embodiment has a two-piece structure.

  In the present embodiment, the face member 2 and the head body 3 are both made of a metal material. As a preferred embodiment, a metal material having a specific gravity smaller than that of the head body 3 is used for the face member 2. As a result, the head 1 having a large moment of inertia and a sweet area while reducing the weight is provided.

  For example, titanium, a titanium alloy, an aluminum alloy, maraging steel, or an amorphous alloy is suitable for the face member 2, and a titanium alloy or aluminum alloy having a low specific gravity and high strength is particularly preferable. For the head body 3, for example, stainless steel such as SUS630, SUS255, or SUS450, maraging steel, Ni-based alloy, or soft iron is preferable, and stainless steel, soft iron, or maraging steel is particularly preferable.

  As shown in FIGS. 3 to 4, the face member 2 includes a front surface 4 that constitutes a main part of the face F, a back surface 5 that is the back surface thereof, and an outer peripheral surface 6 that connects them.

  In the present embodiment, the outer peripheral surface 6 of the face member 2 has a contour that is approximately similar to the head outer peripheral surface P in front view. Specifically, in the front view of the face member 2, the outer peripheral surface 6 includes a top portion side outer peripheral surface 6a extending substantially parallel to the top surface Tb, and a sole portion side outer peripheral surface 6b extending substantially parallel to the sole surface So. , And a toe side outer peripheral surface 6c extending substantially parallel to the toe surface To. The heel side outer peripheral surface 6d of the face member 2 is interrupted before the hosel portion 1B and extends substantially vertically between the top portion side outer peripheral surface 6a and the sole portion side outer peripheral surface 6b. Such a face member 2 can occupy a wide range of the face F in the toe-heel direction and the top-sole direction, and can be configured to be more flexible.

  Further, the face member 2 of the present embodiment is formed with a substantially constant thickness tf except for the face line FL and the like. As another embodiment, the face member 2 may be formed with a thin peripheral part and a thick central part. Such a face member 2 is useful for improving resilience without impairing strength.

  The thickness tf of the face member 2 can be appropriately determined according to the material to be used, and is not particularly limited. However, if it is too small, the durability tends to deteriorate, and if it is too large, sufficient deflection is obtained at the time of hitting. The flying distance tends to decrease. From such a viewpoint, the thickness tf is preferably 1.0 mm or more, more preferably 1.5 mm or more, further preferably 2.0 mm or more, and the upper limit is preferably 4.0 mm or less. More preferably, it is 3.5 mm or less, and further preferably 3.0 mm or less.

  As shown in FIG. 4, the head body 3 includes a main frame portion 12 that forms the periphery of an opening O that penetrates in the front-rear direction, and the hosel portion 1 </ b> B that is connected to the heel side.

  The main frame portion 12 includes a top portion frame 12a extending in the toe and heel direction including the top surface Tb, a sole portion frame 12b extending in the toe and heel direction including the sole surface So, and the toe surface To. It includes a toe frame 12c that connects the top frame 12a and the sole frame 12b, and a neck 12d that connects the top frame 12a and the sole frame 12b on the heel side.

  Further, the sole frame 12b is provided with a back wall portion 19 that rises upward on the back face side. Thereby, a pocket-like undercut cavity is formed behind the face member 2. Such a back wall portion 19 concentrates a large amount of weight on the rear and bottom of the head, and is effective in increasing the sweet area and the moment of inertia and adjusting the head center of gravity G lower. The back wall portion 19 is provided at a position and a size that do not come into contact with the back surface 5 of the face member 2 when a ball is hit.

  The opening portion O of the present embodiment has an opening contour that extends substantially parallel to the top surface Tb, the sole surface So, and the toe surface To as well as the contour of the outer peripheral surface 6 of the face member 2 in front view, and the heel thereof. The side extends almost vertically. The opening O is formed so as to surround the sweet spot SS of the face F (intersection of the face F and the normal line standing from the head center of gravity G to the face F).

  Further, the head body 3 is distributed with a large weight around the face member 2 by the opening O. This helps to increase the moment of inertia of the head. Further, when the ball is hit, the face member 2 bends toward the back face side, but the opening O provides a large space in which the face member 2 can be freely bent at the time of hitting. Therefore, the flight distance is extended by the spring effect. Further, the opening O is not limited to one that penetrates the head body 3, and may be one that is closed by a back wall portion (not shown) on the back face side that does not contact the back surface 5 of the face member 2. Absent.

The head body 3 is provided with a face receiving portion 15 around the opening portion O and on the front side thereof. The face receiving portion 15 faces the outer peripheral surface 6 of the face member 2 and supports the inner peripheral surface portion 13, and projects from the inner peripheral surface portion 13 to the head center side (the sweet spot SS side in FIG. 1). It is formed in a cross-sectional substantially step shape including a receiving surface 14 that supports the peripheral portion of the back surface 5 of the member 2.

  The inner peripheral surface portion 13 is continuously formed in an annular shape along the opening O, and has a slightly larger contour shape than the outer peripheral surface 6 of the face member 2. The receiving surface 14 is formed by a plane substantially parallel to the face F.

  Then, the face member 2 is fitted into the face receiving portion 15 of the head main body 3, and is fixed integrally by one or a plurality of joining means such as adhesion, press-fitting, caulking, welding, or screwing.

  FIG. 5 shows a front view of a vertical state in which the head body 3 in the reference state is tilted forward at a loft angle β so that the face is held vertical. For the sake of easy understanding, the receiving wall 14 is colored and the back wall portion 19 and the like behind it are not shown. As is apparent from FIG. 5, the receiving surface 14 has a top side portion 14c extending on the head upper side, a sole side portion 14s extending on the head bottom side, and between the top side portion 14c and the sole side portion 14s. It is formed in an annular shape including a toe side portion 14t connected on the side and a heel side portion 14h connecting the top side portion 14c and the sole side portion 14s on the heel side.

  Here, the top side part 14c, the sole side part 14s, the toe side part 14t, and the heel side part 14h of the receiving surface 14 are determined as follows in the front view of the head body 3 in the vertical state. First, a vertical line L1 passing through the most toe side position P1 of the receiving surface 14 and a vertical line L2 passing through the most heel side position P2 of the receiving surface 14 are determined. Next, vertical lines L3 to L5 that divide the horizontal length AW between these vertical lines L1 and L2 into four equal parts are sequentially set from the toe side. And in the receiving surface 14, the part extending the section of the vertical line L1-L3 extends to the toe side part 14t, the part extending the section of the vertical line L2-L5 extends to the heel side part 14h, and the upper part of the section of the vertical line L3-L5. The portion extending from the top side portion 14c and the lower side of the section of the vertical line L3-L5 is defined as the sole side portion 14s.

One feature of the club head 1 according to the present embodiment is that the width of the receiving surface 14 is changed so as to satisfy the following expression.
Wt> Wc
Wt> Ws
Here, Wt is an average width of the toe side portion 14t of the receiving surface 14, Wc is an average width of the top side portion 14c, and Ws is an average width of the sole side portion 14s. Each of the average widths is determined as a weighted average obtained by weighting the actual widths Wti, Wci, and Wsi of the receiving surface 14 extending through the respective regions by their lengths. The width of the receiving surface 14 at an arbitrary position is measured as the shortest distance from the outer contour line Ko of the receiving surface 14 to the inner contour line Ki of the receiving surface 14.

  Thus, by making the average width Wt of the toe side part 14t of the receiving surface 14 relatively larger than the average width Wc of the top side part 14c and the average width Ws of the sole side part 14s, the toe side of the head 1 It becomes possible to relatively increase the weight of. Therefore, in the club head 1 of the present embodiment, the moment of inertia of the club head 1 with respect to the head center of gravity G (shown in FIG. 3) or the shaft axis center line CL increases, and as a result, the directionality and initial speed of the hit ball can be improved. .

  In particular, the ratio Wt / Wc between the average width Wt of the toe side portion 14t and the average width Wc of the top side portion 14c is preferably 1.2 or more, more preferably 1.5 or more, and preferably 4. 0 or less, more preferably 3.0 or less is desirable. In particular, the ratio Wt / Ws of the average width Wt of the toe side portion 14t and the average width Ws of the sole side portion 14s is preferably 1.2 or more, more preferably 1.5 or more, and preferably 3. 0 or less, more preferably 2.5 or less is desirable.

  If these ratios Wt / Ws or Wt / Wc are excessively small, there is a possibility that the effect of distributing the weight to the toe side and the effect of increasing the size of the opening O may not be sufficiently obtained. There is a possibility that the strength of bonding to the face member 2 at the top side portion 14c or the sole side portion 14s may be reduced and excessive weight distribution to the toe side may be caused.

Moreover, in order to exhibit the said effect | action more effectively, it is desirable that the average width Wt of the toe side part 14t of the receiving surface 14 is larger than the average width Wh of the heel side part 14h. That is, it is desirable to satisfy the following formula.
Wt> Wh

  In particular, the ratio Wt / Wh between the average width Wt of the toe side portion 14t and the average width Wh of the heel side portion 14h is preferably 1.1 or more, more preferably 1.3 or more, and preferably 6. 0 or less, more preferably 3.0 or less is desirable. If the ratio Wt / Wh is excessively small, the effect of distributing the weight to the toe side may not be sufficiently obtained. Conversely, if the ratio Wt / Wh is excessively large, the bonding strength with the face member 2 at the heel side portion 14h is decreased. In addition, excessive weight distribution to the toe side may be caused.

Further, in order to effectively exhibit the above-described action, the average width Wc of the top portion side 14c, the average width Wh of the heel side portion 14h, and the average width Ws of the sole side portion 14s of the receiving surface 14 are expressed by the following relationship. It is desirable to satisfy. In other words, the average width Wh of the heel side portion 14h is configured to be the smallest in the surface 14, thereby helping to increase the moment of inertia.
Wc> Wh
Ws> Wh

  In particular, the ratio Wc / Wh between the average width Wc of the top side portion 14c and the average width Wh of the heel side portion 14h is preferably 1.1 or more, more preferably 1.3 or more, and preferably 3. 0 or less, more preferably 2.0 or less is desirable. Further, the ratio Ws / Wh between the average width Ws of the sole side portion 14s and the average width Wh of the heel side portion 14h is preferably 1.1 or more, more preferably 1.3 or more, and preferably 4. 0 or less, more preferably 3.0 or less is desirable. If the ratio Wc / Wh or Ws / Wh is small, there is a possibility that improvement in directionality due to an increase in the moment of inertia cannot be expected. On the other hand, if the ratio Wc / Wh or Ws / Wh is too large, There is a risk of decline.

  Further, in the club head 1 of the present embodiment, since the average width Wc of the top side portion 14c and the average width Ws of the sole side portion 14s of the receiving surface 14 are relatively small, the vertical dimension of the opening O is increased. The face member 2 can be sufficiently bent at the time of hitting the ball to increase the flight distance.

  By defining the average width of the receiving surface as described above, the opening height measured parallel to the face F of the opening O in the cross section passing through the head gravity center G and the sweet spot SS as shown in FIG. The thickness OH is preferably 30 mm or more, more preferably 35 mm or more, and even more preferably 40 mm or more. On the other hand, if the opening height OH is excessively large, the top frame 12a is positioned at a high position, and the head center of gravity G may be increased. From such a viewpoint, the height OH is preferably 55 mm or less, more preferably 50 mm or less, and still more preferably 45 mm or less.

The maximum width OW in the toe-heel direction of the opening O (shown in FIG. 5 ) is preferably 60 mm or more, more preferably 65 mm or more, still more preferably 70 mm or more, and preferably 85 mm or less. Is desirably 80 mm or less, more preferably 75 mm or less.

  The ratio OH / OW between the opening height OH and the maximum width OW of the opening O is preferably 0.45 or more, more preferably 0.55 or more, and preferably 0.75 or less, more preferably Is preferably 0.65 or less.

Further, it is desirable that the receiving surface 14 satisfies the following expression in relation to the average width Wc of the top side portion 14c and the average width Ws of the sole side portion 14s.
Ws> Wc

  In this way, by making the average width Ws of the sole side portion 14s of the receiving surface 14 larger than the average width Wc of the top side portion 14c, it is possible to distribute more weight to the head bottom side. Therefore, the head center of gravity G is lowered, and it is useful for obtaining a hit ball with less back spin and difficult to blow up.

  In particular, the ratio Ws / Wc between the average width Ws of the sole side portion 14s and the average width Wc of the top side portion 14c is preferably 1.2 or more, more preferably 1.5 or more, and preferably 2. 5 or less, more preferably 2.0 or less is desirable. If the ratio Ws / Wc is small, the center of gravity cannot be sufficiently lowered, and as a result, the flying distance may not be sufficiently improved. If the ratio Ws / Wc is too large, the joint with the face member 2 at the top side portion 14c. Strength may be reduced.

  Further, the toe side portion 14t of the receiving surface 14 desirably has an average width Wt2 of the lower half 14t2 larger than an average width Wt1 of the upper half 14t1. In such a configuration, it is possible to distribute more head weight to the sole side even in the toe side portion, which is useful for lowering the center of gravity G of the head. In particular, the ratio Wt2 / Wt1 between the average width Wt2 of the lower half 14t2 of the toe side portion 14t and the average width Wt1 of the upper half 14t1 is preferably 1.1 or more, more preferably 1.3 or more, and preferably Is preferably 3.0 or less, more preferably 2.0 or less. The upper half 14t1 and the lower half 14t2 of the toe side portion 14t are a portion above and below the midpoint CP of the length of the center line C of the width in the toe side portion 14t of the receiving surface 14. Respectively.

  The average width Wt of the toe side portion of the receiving surface 14 is not particularly limited, but if it is too small, the bonding strength with the face member 2 may be reduced, and the durability of the head may be deteriorated. On the other hand, if the average width Wt is too large, the opening portion O becomes small and the resilience performance of the head decreases, and the head weight may increase. From such a viewpoint, the average width Wt of the toe side portion 14t is preferably 2.0 mm or more, more preferably 3.0 mm or more, still more preferably 4.0 mm or more, and preferably 8.0 mm or less. Preferably it is 7.0 mm or less, more preferably 5.0 mm or less.

  Further, in the present embodiment, the average width Wh of the heel side portion 14h formed to be the smallest is preferably 0.5 mm or more in order to ensure sufficient bonding strength with the face member 2 while increasing the moment of inertia. More preferably, it is 1.0 mm or more, preferably 4.0 mm or less, more preferably 3.0 mm or less, and still more preferably 2.0 mm or less.

  Further, the average width Wc of the top side portion 14c of the receiving surface 14 is preferably 1.0 mm or more, more preferably, in order to ensure a bonding strength with the face member 2 while providing a large opening O in the vertical direction. 1.5 mm or more is desirable, preferably 5.0 mm or less, more preferably 4.0 mm or less, and still more preferably 3.0 mm or less.

  Further, the average width Ws of the sole side portion 14s of the receiving surface 14 is preferably 1.0 mm in order to secure a bonding strength with the face member 2 and to lower the center of gravity while providing a large opening O in the vertical direction. More preferably, the thickness is 1.5 mm or more, preferably 6.0 mm or less, more preferably 5.0 mm or less, and still more preferably 4.0 mm or less.

  In addition, the above-described magnitude relationships are all related to the average width of the receiving surface 14, but are preferably actual at arbitrary positions of the toe side portions 14t, the top side portions 14c, the sole side portions 14s, and the heel side portions 14h. It is desirable to satisfy a certain relationship with respect to the widths Wti, Wci, Wsi, and Whi.

For example, the average width Wt of the toe side portion 14t and the average width Wc of the top side portion 14c are determined so as to satisfy the relationship of Wt> Wc. In this case, preferably, the toe side portion of the receiving surface 14 It is desirable that the maximum width Wti (max) of 14t be equal to or greater than the maximum width Wci (max) of the top side portion 14c, more preferably greater than the maximum width Wci (max). Similarly, it is desirable that the minimum width Wti (min) of the toe side portion 14t is greater than or equal to the minimum width Wci (min) of the top side portion 14c, more preferably larger than the minimum width Wci (min). Further, the minimum width Wti (min) of the toe side portion 14t is desirably equal to or larger than the average width Wc of the top side portion 14c, more preferably larger than the average width Wc. When these relationships are represented by mathematical formulas, they are preferably represented by formulas (7) to (9), and more preferably are represented by formulas (10) to (12).
Wti (max) ≧ Wci (max) (7)
Wti (min) ≧ Wci (min) (8)
Wti (min) ≧ Wc (9)
Wti (max)> Wci (max) (10)
Wti (min)> Wci (min) (11)
Wti (min)> Wc (12)

  That is, the receiving surface 14 has a maximum width and a minimum width of a portion having a larger average width that are larger than a maximum width and a minimum width of a portion having a smaller average width and a portion having a larger average width. The narrow width is larger than the average width of the smaller average width. It is desirable that such a relationship is also applied to an average width magnitude relationship other than the above example.

  FIG. 6 shows a front view of the head body 3 in a vertical state as another embodiment of the present invention. In the above embodiment, the width of the receiving surface 14 has been shown to change smoothly without a local step. However, in this embodiment, the widths Wt, Wc, Ws, and Wh of the toe side portion 14t, the top side portion 14c, the sole side portion 14s, and the heel side portion 14h of the receiving surface 14 are configured to be substantially constant. . Therefore, the width of the receiving surface 14 changes through the step at the boundary position of each part of the receiving surface 14. Thus, the present invention can be implemented in various modes.

  In order to confirm the effect of the present invention, a plurality of types of iron-type golf club heads (5 iron, loft angle 24 degrees) are prototyped based on the specifications in Table 1, and the flight distance and directionality of the hit ball are tested. It was.

SUS630 lost wax precision castings are used for each head body, and Ti-6Al-4V is used for the face member. By pressing the face member into the head body and caulking, an iron-type golf with a total length of 38 inches is used. A club head (with a shaft manufactured by SRI Sports, FRP shaft MP500, Flex SR) was prototyped. As shown in FIG. 6, the receiving surface of each head body has a certain width at each part. The thickness tf of each face member is 3.0 mm.
The test method is as follows.

<Flight distance>
A test club was attached to the swing robot, and 10 golf balls (“XXIO” (registered trademark) DC manufactured by SRI Sports) were hit in the center of the face, and the average distance to the ball stop position was measured. The head speed was 43 m / s. A result is an index | exponent which sets the average flight distance of the comparative example 1 to 100, and shows that it is so favorable that a numerical value is large.

<Flight distance variation>
A golfer with a handicap of 5 to 10 hits 10 balls and then hits 10 balls for measurement, and the amount of deviation in the front-rear direction distance between the ball stop position and the target (in either case of jumping or shorting) But a positive value) was measured, and the average deviation was determined. The result is an index in which the average deviation amount of Comparative Example 1 is set to 100, and the larger the value, the smaller the flight distance variation and the better.

<Directional variation>
At the time of the flight distance variation test, simultaneously, the amount of left / right deviation (a positive value regardless of whether the deviation was to the right or left) with respect to the target flying line was measured, and the average deviation of 10 balls was calculated for each example. The result is an index in which the average deviation amount of Comparative Example 1 is set to 100, and the larger the value, the smaller the directionality variation and the better.

<Effective rate of each performance above>
Calculated according to the following formula. The larger the value, the better the result.
(Index of any example −100) / (highest index −100)
Table 1 shows the test results.

  As a result of the test, it was confirmed that the examples had excellent flight distance and directionality.

1 is a front view of a golf club head showing an embodiment of the present invention. FIG. It is an AA end view of FIG. It is a disassembled perspective view of a head. It is a front view of the head body in a vertical state. It is a front view of the perpendicular state of the head main part which shows other embodiment of this invention. (A) And (b) is the front view and sectional drawing of the conventional head.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Golf club head 2 Face member 3 Head main body 6 The outer peripheral surface 13 of a face member Inner peripheral surface part 14 Receiving surface 15 Face receiving part

Claims (3)

An iron type golf club head including a face member constituting at least a part of a face for hitting a ball, and a head body to which the face member is fixed on the front side,
The head body has an opening that does not contact the back surface of the face member, and a face receiving part is provided around the opening.
The face receiving portion includes an inner peripheral surface portion that supports the outer peripheral surface of the face member, and a receiving surface that protrudes from the inner peripheral surface portion toward the center of the head and supports the peripheral portion of the back surface of the face member. The receiving surface includes a top side extending from the head upper side, a sole side extending from the head bottom side, a toe side connecting the top side and the sole side at the head tip side, and the top side. While forming an annular shape having a heel side connecting the sole side with the heel side,
An iron type golf club head characterized by satisfying the following formula .
Wt> Wc
Wt> Ws
Wc> Wh
Ws> Wh
However, the symbols are as follows.
Wt: Average width of the toe side of the receiving surface Wc: Average width of the top side of the receiving surface Ws: Average width of the sole side of the receiving surface
Wh: Average width of the heel side of the receiving surface 2. The iron type golf club head according to claim 1, wherein an average width Wc of a top side portion and an average width Ws of a sole side portion of the receiving surface satisfy the following expression .
Ws> Wc The iron-type golf club head according to claim 1 or 2, wherein the toe side portion of the receiving surface has an average width Wt2 of the lower half larger than an average width Wt1 of the upper half .

Images