JP2009072644A - Iron club head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure the weight of a necessary part, leave a design freedom degree of the shape of a golf club head of a part easily visible from the outside and remove an excessive thickness. <P>SOLUTION: This iron club head is provided with a head body 12 having a face 10 and a cavity in the back side of the face, and a weight adjusting body 14 formed of a metal material having a specific gravity larger than that of the head body forming material. The weight adjusting body is positioned in the lower end in the back side of the sole of the iron club head; the wall thickness in the crosswise direction orthogonally crossing the toe-heel direction is varied to be large/small by irregularly forming not the back side but the face side; the lower part of the cavity of the head body has a wall part covering the weight adjusting body; and the wall thickness in an area to the center part in the longitudinal direction and the wall thickness of an area to the heel part are not remarkably varied in the wall part to form the irregular shape according to the wall thickness variation of the weight adjusting body. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an iron club head provided with a cavity on the back side in a golf club.

In golf, if the position of the center of gravity of the head is lower than the ball hitting position, a high trajectory with a large ball launch angle is obtained, and the flight distance increases. In addition, the backspin amount can be appropriately reduced, and the flight distance tends to increase. In addition, if the center of gravity is moved away from the face surface and the depth of the center of gravity is increased, the moment of inertia of the head increases. Area expands). For these reasons, the center of gravity has been devised to be low or deep. An example in which a weight for adjusting the position of the center of gravity and weight is provided in the back portion is disclosed in Patent Document 1 below. In this document, weight is extended upward in the center part of the toe / heel direction (front-rear direction), the toe part, and the heel part, and the stability at the time of hitting and the improvement of hit feeling are achieved by increasing the moment of inertia. Yes.
Utility Model Registration No. 3089247

However, the structure disclosed in the above publication has a shape that extends upward without changing the thickness of the weight in the face-back direction (left-right direction). In addition to the disadvantage of increasing the center of gravity, the shape of the golf club head that can be easily visually recognized from the outside is defined by the shape of the weight, particularly as seen in the center of the back wall. The degree of freedom of design is lost.
Therefore, the problem to be solved is a golf club head that secures the weight of the necessary portion, and has the design freedom of the golf club head shape of the portion that can be easily visually recognized from the outside, and eliminates the luxury The purpose is to provide.
Another object of the present invention is to provide a golf club head having as low a center of gravity and a deep depth of center of gravity as possible.

In view of the former object, the present invention provides an iron club head comprising a head body having a face portion and a cavity on the back side of the face portion, and a weight of a metal material having a specific gravity larger than that of the head body forming material. And a weight adjusting body comprising one or a plurality of element bodies is located at a lower end on the back side of the sole portion of the iron club head, and the weight adjusting body has a toe-heel direction. The thickness in the left-right direction perpendicular to the front-rear direction changes in size along the front-rear direction by making the face side, not the back side, uneven, and the lower part of the cavity of the head body adjusts the weight. The thickness of the weight adjusting body is not greatly changed in the thickness of the area near the center in the front-rear direction, the area near the toe, and the area near the heel. Along with change To provide a iron club head, characterized in that is uneven in formation.
In the case where the weight adjusting body is a plurality of element bodies, it can be said that the weight adjusting body is located in the lower corner of the back side and is arranged in the front-rear direction. However, in the case of a single element, in the case of a short element body provided only on the toe side of the head, only on the heel side, or only in the middle part thereof, it is merely located at the lower corner of the back side.
The size of the wall thickness (when small) is an expression including the case of zero. That is, when separated into a plurality of element bodies, the thickness between them is zero, but this is also expressed as small thickness.
In a general expression, when there is a back portion rising from the rear end portion of the sole portion, the above-described sole portion includes a lower portion of the back portion. That is, the lower part of the back part is regarded as a part of the sole part. Therefore, in this case, the back side lower end portion of the sole portion can be said to be the lower end portion of the back surface of the back portion when generally expressed using the back portion. Further, when the head main body is formed of two kinds of metals, such as when having a face plate formed of a different material, the specific gravity of the weight adjusting body is larger than any of them.

Further, the weight adjusting body in the case where there is one element body has an upper and lower sides perpendicular to the thickness dimension in the left-right direction in the transverse section in the most length range of the length in the front-rear direction. It is preferable that the dimensional ratio of the thickness dimension in the direction is in the range of the difference within 50%.
The majority means about 80% or more. same as below.
In the case where there are a plurality of element bodies, the weight adjusting body is orthogonal to the thickness dimension in the left-right direction in the transverse section, with each element body in the most length range of the longitudinal length. It is preferable that the dimensional ratio of the thickness dimension in the vertical direction is in the range of the difference within 50%.

  Since the weight adjuster is disposed so as to be positioned at the lower end on the back side of the sole portion, the position of the center of gravity of the golf club head can be lowered, and the depth of the center of gravity can be increased. In addition, in the design of each golf club head, when it is desired to improve the hit feeling, the weight is concentrated near the center in the front-rear direction, and when importance is attached to the stability of the golf club head at the time of hitting, the weight is increased. Concentrate on the toe and heel sides. Accordingly, the thickness of the weight adjusting body stretched or disposed in the front-rear direction is small (in a sense including zero) in a cross-section by a plane perpendicular to the front-rear direction, and other predetermined positions Then change the size so that it is large. In this case, the direction of the thickness to be increased is not limited to the upper direction as in Document 1, but at least in the left-right direction, the center of gravity can be lowered as long as the thickness changes in the left-right direction. Instead, the face portion side is changed to be uneven. That is, it is possible to prevent the cavity side that is difficult to be visually recognized from the outside from being uneven, and to prevent the outside region that is easily visible from the outside from being greatly uneven by weight adjustment. As described above, the degree of freedom in designing the shape of the outer region that is easily visible from the outside of the golf club head is improved. Therefore, the present application does not exclude a form in which unevenness occurs in the vertical direction. In addition, the fact that the lower part of the cavity of the cavity of the head body is formed in an uneven shape along the thickness change of the weight adjusting body means that the recessed part is removed in the concave part. It can be said that the waste of the material is eliminated. In other words, the removed meat can be rearranged at a necessary portion such as a peripheral portion of the golf club head, for example, in order to improve the moment of inertia, which is effective. .

  In the latter two preferred structures, the thickness ratio between the upper and lower sides and the right and left sides of the cross section is within the range of difference within 50%, and therefore, it does not extend greatly in any one direction. Both the low height and the depth of the center of gravity can be achieved moderately, increasing the flight distance and stabilizing the hitting.

  Hereinafter, the present invention will be described in detail with reference to the drawings. 1 to 7 show a first embodiment of a golf club head according to the present invention. 1 is a front view placed on the ground according to the lie angle θ, FIG. 2 is a cross-sectional view taken along line BB, FIG. 3 is a rear view, and FIG. 4 is a bottom view seen from the direction of arrow D in FIG. 5 is a cross-sectional view taken along line EE in FIG. 1, FIG. 6 is a front view of the golf club head except for the main body, and FIG. 7 is a cross section taken along line GG in FIG. FIG. Hereinafter, an example in which the weight adjusting body is formed by one element body will be described.

  The left-right direction in FIG. 1 is the front-rear direction in the present application, the up-down direction is the up-down direction, and the direction orthogonal to the drawing is the left-right direction. In the present application, when it is necessary to determine the direction of the golf club head, it is determined in a state of being placed on the ground according to the lie angle θ. In the following example, the back portion 12B is clearly provided, but the presence or absence of the back portion may be unknown or not.

  This golf club head has a head body and a weight adjuster 14. The head body has a face plate 10 made of a different material for forming a face portion, and is formed by welding the plate. In the following description, the remaining part excluding the face plate 10 is referred to as a head body 12 for the sake of simplicity, although different from the terms of the claims. The face plate has a high resilience and is formed of a material having a relatively small specific gravity (preferably a specific gravity of 5 or less), such as titanium, a titanium alloy, a magnesium alloy, duralumin, and an aluminum alloy. The head body is formed by casting with a metal material such as stainless steel. The weight adjusting body is made of a metal material having a specific gravity larger than that of the head body, preferably a specific gravity of 7 or more. For example, stainless steel, nickel copper alloy, tungsten, tungsten alloy and the like. However, a material that can be welded to the head body is preferable. In the following example embodiments, the weight adjuster is welded to the head body.

  As shown in FIG. 6, the face plate 10 is placed on the head body 12 provided with the stepped portion 12D, and the periphery is welded. Further, the head body has a hosel portion 12HZ for inserting and connecting a shaft 16 made of metal or FRP. The lower part of the golf club head or head main body part 12 is a sole part 12S, the upper part is a top part 12U, the tip part is a toe part 12T, and the rear end part is a heel part 12H. In the present application, a back portion 12B standing on the back side of the sole portion is formed, and a cavity KB is formed on the back side of the face plate 10. The cavity is surrounded by a back surface of the face portion formed by the face plate, a lower surface KB2 of the top portion 12U, and a surface KB1 obtained by combining the upper surface of the sole portion and the surface of the back portion on the face plate side. This surface KB1 is also referred to as a lower surface of the cavity KB. When there is no back portion, the surface KB1 is only constituted by the upper surface of the sole portion.

  The weight adjuster 14 is partly exposed at the lower end of the sole portion on the back side of the sole portion in the meaning described above and exposed to the outside. In other words, in this example, a part of the cross section of the weight adjusting body is located at the lower end portion of the back portion outer side surface (back surface). The golf club head extends in the front-rear direction. The aim of this position is to lower the center of gravity and to increase the depth of the center of gravity by positioning the weight adjuster at a position that can be called a corner. The thickness ratios in the left and right direction and the up and down direction of the weight adjusting body described below are unnecessary requirements in claim 1 of the present application.

  As is apparent from FIGS. 3, 4, 6, and 7, the weight adjusting body 14 in this example is thin in the center region in the front-rear direction of the golf club head and thick on the top side and the heel side. . The thickness in the left-right direction (meaning the maximum thickness) in FIG. 2 illustrating the cross-sectional shape of the weight adjusting body in the central portion (BB) in the front-rear direction center (BB) of the golf club head in FIG. There is a thickness H1 in the vertical direction of about 0.7 with respect to T1. Further, the ratio of the vertical thickness H2 to the horizontal thickness T2 in FIG. However, the wall thickness T2 is larger than the wall thickness T1, and in this example, the wall thickness H2 is also larger than the wall thickness H1.

  On the other hand, the back surface of the golf club head smoothly extends in the front-rear direction, and the exposed back side surface of the weight adjusting body 14 is also along this, so that the unevenness change due to the above-described wall thicknesses T1 and T2 is It appears on the face plate side, not on the back side. The unevenness on the face plate side in the left-right direction hardly affects the shape that can be easily visually recognized from the outside. That is, it is difficult to influence the external shape design.

  Further, the thickness t1 of the portion to which the surface KB1 ′ of the lower portion of the cavity in FIG. 2 belongs is not significantly different from the thickness t2 of the portion to which the surface KB1 ″ of the lower portion of the cavity in FIG. That is, it can be said that the surface KB1 in the lower portion is recessed in the surface KB1 ′ in the region closer to the central portion than the surface KB1 ″ in the region closer to the toe portion in FIG. 1, and the meat portion comparable to the recess is removed. It can be said that there is no wasted meat corresponding to the removed portion, and it can be said that the portion is effectively distributed to other necessary areas. The unevenness of the surface KB1 is difficult to visually recognize from the outside. As for the weight adjusting body and the surface of the lower part of the cavity, the area near the heel such as the position E′-E ′ shown in FIG. It can be said that the same matters as described in the comparison between FIG. 2 and FIG.

  In the above first embodiment, the sweet area is enlarged to aim at the stability of the head at the time of hitting, but in order to improve the hit feeling at the time of hitting, the weight is concentrated on the center part in the front-rear direction of the golf club head. If desired, the second embodiment shown in FIG. 8 corresponding to FIG. 7 and the cross-sectional view taken along the arrow line II in FIG. 9 is used. That is, the weight adjusting body 14 ′ has a shape in which the center portion in the front-rear direction is expanded toward the face plate. The lower surface kb1 of the corresponding cavity is also formed as a bulged part kb1 'at the center, a recessed part kb1 "on the toe part 12T side, and a recessed part kb1" on the heel part 12H side.

Further, FIG. 10 shows a third embodiment of a golf club head aiming at collecting weight on the toe portion 12T side to make it easier to prevent the opening of the face surface at the time of hitting and to prevent slicing. The weight adjusting body 14 ″ has a thick shape on the toe side toward the face plate. The surface kb1 on the lower side of the cavity has a surface kb1 ″ in the region closer to the toe than the surface kb1 ′ in other regions. It has become uneven.
Although illustration is omitted, unlike FIG. 10, when the weight is collected on the heel portion side, the distance from the shaft axis to the center of gravity is shortened, and it becomes easy to control. Such a golf club head can also be manufactured by this application structure.

  The above is an example of a relatively slender weight adjusting body having one element body. However, as shown by two-dot chain lines 14A and 14B in FIG. 7, the element body 14A and the element body are respectively provided on the toe side and the heel side. This application is applied even when 14B is provided and not provided between them. In this case, the back side of each element body is smoothly and continuously formed on the back side of the head body 12, but on the face plate 10 side, a cavity in the middle part in the front-rear direction, which is a region between the two element bodies The lower portion of the surface is formed, for example, to be depressed as shown by a broken line. These effects are the same as in the case of the first embodiment.

In the case of the aim as shown in FIG. 10, it is also possible to provide a configuration in which one short element body (weight adjusting body) is provided only in the toe side region and no element body is provided in the other regions. Except this, it is the same as the case of the above-described embodiment described with reference to FIG.
Further, in the present invention, an iron club head in which the head body 12 and the face plate 10 are integrally formed of the same material may be used. Each embodiment may be selected for each count in the golf club set.

  The present invention can be used for an iron club head.

FIG. 1 is a front view of a golf club head according to the present invention. 2 is a cross-sectional view taken along line BB in FIG. FIG. 3 is a rear view of the golf club head of FIG. FIG. 4 is a bottom view taken along arrow D in FIG. FIG. 5 is a cross-sectional view taken along line EE in FIG. FIG. 6 is a front view of only the head body. 7 is a cross-sectional view taken along line GG in FIG. FIG. 8 shows a second embodiment of the golf club head according to the present invention and corresponds to FIG. FIG. 9 is a cross-sectional view taken along the line II of FIG. FIG. 10 shows a third embodiment of the golf club head according to the present invention and corresponds to FIG.

10 Face plate 12 Head body 14 Weight adjuster KB Cavity KB1 Surface of the lower part of the cavity

Claims (1)

The iron club head includes a head body having a face portion and a cavity on the back side of the face portion, and a weight adjusting body of a metal material having a specific gravity larger than the head body forming material,
The weight adjusting body composed of one or a plurality of element bodies is positioned at the lower end on the back side of the sole portion of the iron club head, and the weight adjusting body is orthogonal to the front-rear direction which is the toe-heel direction. The wall thickness in the left-right direction varies in size along the front-rear direction by making the face side uneven, not the back side,
The lower part of the cavity of the head body has a meat part that covers the weight adjusting body, and the meat part has respective thicknesses in the front-rear direction center part area, the toe part area, and the heel part area. The iron club head is characterized in that it is formed in a concavo-convex shape along the thickness change of the weight adjusting body without greatly changing.

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