GOLF CLUB HEAD AND GOLF CLUB

Abstract

The present invention provides a golf club head and a golf club by which at least a lie angle, an offset of a striking surface, and the moment of inertia can be adjusted. This golf club head has: a head main body provided with a face surface part constituting a face surface; a hosel part which is provided in the head main body, and to which a golf club shaft is attached; adjustment weights provided on the head main body; a lie angle adjustment part for changing the lie angle; and an offset adjustment part for changing the distance between the face surface and the hosel part. The head main body is provided with a projecting part on the upper surface that projects outward in a half cylinder shape, and flat parts that are provided on both sides of the projecting part, and the hosel part is provided on the projecting part and the adjustment weights are respectively provided on the flat parts. The golf club has the golf club head.

Description

TECHNICAL FIELD

The invention relates to a golf club head and a golf club for striking a golf ball on a green, and specifically relates to a golf club head and a golf club in which it is possible to adjust at least a lie angle, an offset of a striking surface, and a moment of inertia.

BACKGROUND ART

In golf, a putter is used as a golf club for putting a golf ball into a cup on a green.

As an ability required in the putter, high straight advancing ability of the golf ball when the golf ball is struck is required. This makes it possible for a golfer, who is a user, to roll the golf ball such that a trajectory expected by the golfer is drawn.

For example, Patent Document 1 describes detachable weights suitably used for adjusting the moment of inertia of a golf club head.

In addition, a body size, a muscular strength, etc. are different for each golfer, and a lie angle and a loft angle required for each golfer are different. For example, Patent Document 2 describes a golf putter having a variable lie angle. Patent Document 3 describes a putter for which a desired loft can be set.

CITATION LIST

Patent Literature

Patent Document 1: JP2009-247911 A

Patent Document 2: JP2009-136638 A

Patent Document 3: JP2003-210629 A

SUMMARY OF INVENTION

Technical Problem

As described above, in the prior art, one of a lie angle, a loft angle, and the moment of inertia of a putter can be adjusted, but it cannot be said that a putter according to user requests can be obtained.

An objective of the invention is to provide a golf club head and a golf club that solve the problem based on the above-described prior art, and that make it possible to adjust at least a lie angle, an offset of a striking surface, and a moment of inertia.

Solution to Problem

In order to achieve the above-described object, the invention provides a golf club head, including a head main body including a face surface part constituting a face surface, a hosel part provided in the head main body and on which the golf club shaft is mounted, adjustment weights provided in the head main body, a lie angle adjustment part configured to change a lie angle, and an offset adjustment part configured to change a distance between the face surface and the hosel part, wherein the head main body includes a projecting part projecting semi-cylindrically from an upper surface, and flat parts respectively provided on both sides of the projecting part, and the projecting part is provided with the hosel part and the adjustment weights are respectively provided on the flat parts.

It is preferable that an angle adjustment part configured to change a loft angle of the face surface is included.

It is preferable that the face surface part is provided detachably with respect to the head main body, and a plurality of the face surface parts are provided for respective sizes of the loft angle, and the face surface part corresponding to the loft angle is provided.

It is preferable that the face surface part is provided such that a sole side can be slid with respect to the head main body with a top part of the projecting part as a fulcrum, and the loft angle is adjusted by changing a slide amount of the face surface part.

It is preferable that a plate-shaped part constituting part of a sole is provided on a back face on an opposite side of the face surface of the head main body, and in the plate-shaped part, of a region corresponding to the projecting part and regions corresponding to the flat parts, the region corresponding to the projecting part has a thinner plate thickness.

For example, the adjustment weights are fixed to the flat parts by screws or magnets.

It is preferable that the hosel part includes a rotor provided on a rear surface side of the face surface of the projecting part and rotatable by a predetermined angle, and a hosel provided in the rotor and configured to fix the golf club shaft, and the rotor is fixed at the predetermined angle to form the lie angle having a specific size.

It is preferable that a spacer can be disposed between the rotor and the projecting part, and the distance between the face surface and the hosel part is adjusted by a thickness of the spacer.

The invention provides a golf club including the above-described golf club head according to the invention.

Advantageous Effects of Invention

According to the invention, it is possible to adjust a lie angle, the offset of a striking surface, and the moment of inertia.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic view illustrating a golf club according to an embodiment of the invention.

FIG. 2 is a perspective view illustrating a first example of the golf club head of the golf club according to the embodiment of the invention.

FIG. 3 is a side view illustrating the first example of the golf club head of the golf club according to the embodiment of the invention.

FIG. 4 is an exploded perspective view illustrating the first example of the golf club head of the golf club according to the embodiment of the invention.

FIG. 5 is a perspective view illustrating a hosel part of the first example of the golf club head of the golf club according to the embodiment of the invention.

FIG. 6 is a schematic view illustrating an offset adjustment in the first example of the golf club head of the golf club according to the embodiment of the invention.

FIG. 7 is a schematic view illustrating an offset adjustment in the first example of the golf club head of the golf club according to the embodiment of the invention.

FIG. 8 is a schematic view illustrating an offset adjustment in the first example of the golf club head of the golf club according to the embodiment of the invention.

FIG. 9 is a perspective view illustrating a second example of the golf club head of the golf club according to the embodiment of the invention.

FIG. 10 is a side view illustrating the second example of the golf club head of the golf club according to the embodiment of the invention.

FIG. 11 is an exploded perspective view illustrating the second example of the golf club head of the golf club according to the embodiment of the invention.

FIG. 12 is a side view illustrating a third example of the golf club head of the golf club according to the embodiment of the invention.

FIG. 13 is a perspective view illustrating a fourth example of the golf club head of the golf club according to the embodiment of the invention.

FIG. 14 is a schematic plan view illustrating a lid of the golf club head of the golf club according to the embodiment of the invention.

FIG. 15 is a schematic plan view illustrating the hosel part of the golf club head of the golf club according to the embodiment of the invention.

FIG. 16 is a perspective view illustrating another example of the hosel part of the golf club head of the golf club according to the embodiment of the invention.

FIG. 17 is a perspective view illustrating a fifth example of the golf club head of the golf club according to the embodiment of the invention.

FIG. 18 is a side view illustrating the fifth example of the golf club head of the golf club according to the embodiment of the invention.

FIG. 19 is a perspective view illustrating the fifth example of the golf club head of the golf club according to the embodiment of the invention viewed from a sole side.

DESCRIPTION OF EMBODIMENTS

A golf club head and a golf club of the invention will be described in detail below with reference to a preferred embodiment illustrated in the accompanying drawings.

FIG. 1 is a schematic view illustrating a golf club according to an embodiment of the invention, FIG. 2 is a perspective view illustrating a first example of a golf club head of the golf club according to the embodiment of the invention, and FIG. 3 is a side view illustrating the first example of the golf club head of the golf club according to the embodiment of the invention. Note that adjustment weights 24 (see FIGS. 1 and 3) are not illustrated in FIG. 2.

As illustrated in FIG. 1, a golf club 10 includes a golf club head 12 and a golf club shaft 14. A grip 15 is attached to the golf club shaft 14. The golf club 10 is generally referred to as a putter and is of a mallet type.

In the golf club 10 illustrated in FIG. 1, the golf club head 12 is arranged with a sole 37 in contact with a horizontal surface B such that a lie angle γ becomes a set angle.

Note that the lie angle γ refers to an angle on a heel side formed by a shaft axis S of the golf club shaft 14 and the horizontal surface B.

The golf club head 12 includes a head main body 20 provided with a face surface part 30 constituting a face surface 31, and a hosel part 22 provided in the head main body 20 and on which the golf club shaft 14 is mounted.

The golf club head 12 includes the adjustment weights 24 further provided on the head main body 20. In addition, the golf club head 12 includes an angle adjustment part that changes a loft angle θ of the face surface 31, a lie angle adjustment part that changes the lie angle γ, and an offset adjustment part that changes the distance between the face surface 31 and the hosel part 22.

As illustrated in FIG. 2, the head main body 20 includes a projecting part 32 projecting semi-cylindrically from an upper surface, and flat parts 34 respectively provided on both sides of the projecting part 32. The projecting part 32 is provided with the hosel part 22. A toe is formed on one of the flat parts 34 of the head main body 20 and a heel is formed on the other of the flat parts 34.

The head main body 20 and the face surface part 30 are formed of, for example, stainless steel, copper, copper alloy, aluminum, aluminum alloy, titanium, titanium alloy, a combination of these materials, etc.

By providing the projecting part 32, the area of the face surface 31 can be made larger. This makes it possible to widen a sweet spot and make the center position of the sweet spot higher than the horizontal surface B. Thus, when striking a golf ball, it is possible to make the center of the golf ball and the center position of the sweet spot closer to each other without worrying about the position of the sole 37. Accordingly, the bouncing of the struck golf ball is suppressed, the golf ball is rotated forwardly, the straight advancing ability of the golf ball when being struck is improved, the directionality of the struck ball is improved, and the direction of the struck ball can be adjusted easily. In addition, it is possible to get a good feeling of striking.

The adjustment weights 24 are provided on the respective flat parts 34 (see FIGS. 1 and 3). That is, the adjustment weights 24 are provided on both sides of the head main body 20.

Specifically, recesses 35 for installing the adjustment weights 24 are formed on flat surfaces 34c, which are upper surfaces of the flat parts 34. The adjustment weights 24 are installed in the recesses 35 and, for example, the adjustment weights 24 are fixed by using screws. Note that the method for fixing the adjustment weights 24 is not particularly limited, and if the adjustment weights 24 are magnetic substances, the adjustment weights 24 may be fixed to the recesses 35 by using magnetic force, such as by using a magnet.

The adjustment weights 24 are formed of, for example, stainless steel, copper, copper alloy, aluminum, aluminum alloy, titanium, titanium alloy, tungsten, etc. The above-described materials are used, as appropriate, in accordance with the mass of the adjustment weights 24. In addition, the number of the adjustment weights 24 is determined, as appropriate, in accordance with the magnitude of the moment of inertia of the golf club head 12. For example, the total mass of the adjustment weights 24 is 60 g. In this case, each of the adjustment weights 24 weighing 30 g is disposed on each of the flat parts 34.

In addition, the shape of the recesses 35 and the shape of the adjustment weights 24 are not particularly limited, and are determined, as appropriate, in accordance with the shape of the flat surfaces 34c of the flat parts 34, etc. In addition, the shape of the adjustment weights 24 is determined, as appropriate, in accordance with the shape of the recesses 35, the mass of the adjustment weights 24, etc.

As illustrated in FIG. 3, in the head main body 20, a plate-shaped part 38 forming part of the sole 37 is provided on a back face 31b on the opposite side of the face surface 31 of the head main body 20. The head main body 20 and the plate-shaped part 38 are formed integrally.

As illustrated in FIG. 4, in the plate-shaped part 38, of a region 38a corresponding to the projecting part 32 and regions 38b corresponding to the flat parts 34, the region 38a corresponding to the projecting part 32 has a thinner plate thickness. That is, the plate thickness of the regions 38b corresponding to the flat parts 34 is relatively thicker. In this way, by making the regions 38b corresponding to the flat parts 34 relatively thicker and relatively heavier, it is possible to increase the moment of inertia of the golf club head 12 and enhance the straight advancing ability of the golf ball when being struck. In addition, even if a part of the golf ball other than the center of the face surface 31 is struck, high straight advancing ability can be obtained and the directionality of the struck golf ball is excellent.

The moment of inertia refers to the moment of inertia around a rotational axis that is a straight line (not illustrated) passing through the center of gravity (not illustrated) of the golf club head 12 and orthogonal to the horizontal surface B.

As illustrated in FIG. 4, a rear surface 32b of the projecting part 32 is provided with a wall part 32a along the periphery of the projecting part 32. The wall part 32a is not provided on part of the projecting part 32 including the top part of the projecting part 32. The rear surface 32b of the projecting part 32 is provided with a vertical shaft 33. A region 32c surrounded by the wall part 32a is provided with the hosel part 22. Note that the adjustment weights 24 (see FIGS. 1 and 3) are not illustrated in FIG. 4.

As illustrated in FIG. 5, the hosel part 22 includes a rotor 40 and a hosel 41 provided in the rotor 40. The hosel 41 fixes the golf club shaft 14 and is formed of, for example, a linear cylindrical member.

The rotor 40 has a similar outer shape to that of the region 32c (see FIG. 4) surrounded by the wall part 32a (see FIG. 4), and has a semi-cylindrical outer shape. The rotor 40 is provided with a hole 40a (see FIG. 5) into which the shaft 33 (see FIG. 4) is to be inserted.

In a state in which the shaft 33 is inserted into the hole 40a of the rotor 40, the rotor 40 can be rotated around the shaft 33. The rotation of the rotor 40 is restricted by the hosel 41 being abutted against an edge 32d (see FIG. 4) of the wall part 32a. Note that the rotor 40 is detachable and replaceable. The hosel 41 is provided at a position at which the axis (not illustrated) of the hosel 41 formed of a linear cylindrical member passes through, for example, the center of the hole 40a in a case that the hole 40a is viewed from the face surface 31 side.

By the rotor 40 being rotated, the lie angle γ (see FIG. 1) changes. By fixing the rotor 40 in a state in which the rotor 40 is rotated by a predetermined angle, the lie angle γ having a specific size can be formed. For example, the wall part 32a is provided such that the rotor 40 can be rotated by 16°. In this case, for example, the lie angle γ can be set to a range of 8° from 72°, i.e., the lie angle γ can be set to 64° to 80°. The approximate range of the rotation amount of the rotor 40 is determined by the size of the projecting part 32 (see FIG. 4). However, the rotation amount of the rotor 40 is not limited to 16° described above, and is determined, as appropriate, in accordance with the range set for the lie angle γ, the size of the projecting part 32, etc. Because the upper limit of the lie angle γ is specified as 80° by the rules, it is preferable that the adjustment range does not exceed 80°.

The method for fixing the rotor 40 is not particularly limited and, for example, the rotor 40 is fixed by providing a screw hole 39 (see FIG. 3) penetrating through the region 32c (see FIG. 4) from the sole 37 (see FIG. 3), screwing a fixing screw (not illustrated) with the screw hole 39, and pushing up the rotor 40 by the fixing screw.

A lid 25 (see FIG. 3) surrounding the region 32c with the wall part 32a is provided. With the lid 25, the rotor 40 is accommodated in the region 32c with a plurality of spacers 42, which will be described later. For example, the lid 25 is fixed to the wall part 32a by a screw.

The lie angle adjustment part is constituted by the hosel part 22, the wall part 32a, the shaft 33, the fixing screw (not illustrated), etc.

The golf club can be made right-handed or left-handed by changing the position at which the hosel 41 is attached to the rotor 40. The rotor 40 is detachable as described above, and a single golf club can be easily made right-handed or left-handed by replacing the rotor 40.

The spacers 42 illustrated in FIG. 5 can be disposed between the rotor 40 and the rear surface 32b of the projecting part 32, and an offset is adjusted in accordance with the thickness of the spacers 42. The spacers 42 constitute the offset adjustment part.

As illustrated in FIG. 3, the offset refers to a distance F from a lower end 31c of the face surface 31 to the shaft axis S in a direction parallel to the horizontal surface B. As the offset becomes greater, the distance from the golf club shaft 14 to the face surface 31 becomes farther.

The outer shape of the spacers 42 is substantially the same as that of the rotor 40 and is, for example, a semicircle. Holes 43 into which the shaft 33 is to be inserted are provided in the spacers 42. The plurality of spacers 42 are accommodated in the region 32c with the rotor 40 by the shaft 33 being inserted into the holes 43. The offset can be changed by changing the arrangement of the plurality of spacers 42. For example, the number of the spacers 42 is three, and the total thickness of the three spacers 42 is 7 mm.

Because the spacers 42 are provided on the projecting part 32, the mass near the face surface 31 becomes greater and the moment of inertia becomes less as the mass of the spacers 42 becomes greater. Thus, the mass of the spacers 42 is preferably small. The spacers 42 are formed of, for example, aluminum, aluminum alloy, etc.

As illustrated in FIG. 5, when all of the three spacers 42 are disposed on the projecting part 32 side of the rotor 40, the offset becomes maximum. As illustrated in FIG. 6, it is possible to dispose two of the spacers 42 on the projecting part 32 side of the rotor 40 and dispose one of the spacers 42 on the lid 25 side of the rotor 40. As illustrated in FIG. 7, it is possible to dispose one of the spacers 42 on the projecting part 32 side of the rotor 40 and dispose two of the spacers 42 on the lid 25 side of the rotor 40. As illustrated in FIG. 8, it is possible to dispose the three spacers 42 on the lid 25 side of the rotor 40. The offsets in FIG. 6, FIG. 7, and FIG. 8 become less in this order. In this way, the offset can be adjusted by changing the arrangement of the three spacers 42 and the rotor 40. In addition, the total thickness is the same in any of the arrangements illustrated in FIG. 5, FIG. 6, FIG. 7, and FIG. 8 because there are the three spacers 42 and the rotor 40. In this way, the offset can be adjusted.

Note that although the thickness of the spacers 42 is not particularly limited, it is possible that each of the spacers 42 has a different thickness, all of the spacers 42 have the same thickness, or two of the three spacers 42 have the same thickness. In addition, the number of the spacers 42 is not limited to three, but may be one, two, or four or more. The number of the spacers 42 can be determined, as appropriate, in accordance with the size of the region 32c and the size of the gap determined by the thickness of the rotor 40. In a configuration in which the three spacers 42 are used, it is possible to provide the three spacers 42 the combination of which is such that the total thickness of the three spacers 42 is the same, and to change the combination of the spacers 42 in accordance with the offset. In this way, the offset can be changed more finely.

The face surface part 30 illustrated in FIG. 3 is detachably provided in the head main body 20, and the face surface part 30 is replaceable. A plurality of the face surface parts 30 are provided for respective sizes of the loft angle θ, and the face surface part 30 corresponding to the loft angle θ is provided.

As illustrated in FIG. 4, the face surface part 30 includes the face part 30a having the same shape as those of the projecting part 32 and the flat parts 34 of the head main body 20, and bent parts 30b provided at respective edges of the face part 30a. Holes 30c are provided in the bent parts 30b at positions aligned with screw holes 34b formed on side surfaces 34a of the flat parts 34. The face part 30a is formed at an angle corresponding to the loft angle θ. The face part 30a becomes thinner from the lower end 31c to a top part 31d of the face surface 31.

As illustrated in FIG. 3, in the face surface part 30, by overlapping the bent parts 30b on the side surfaces 34a of the flat parts 34 and aligning the holes 30c with the screw holes 34b, the face surface part 30 is fixed to the head main body 20 by the screws 45 in a state in which the face surface part 30 is in contact with the end surface 20a of the head main body 20. In this case, the loft angle θ of the face surface 31 of the face surface part 30 becomes a predetermined angle. As described above, the loft angle θ can be changed by attaching the face surface part 30 having a predetermined size of the loft angle θ to the head main body 20.

The above-described face surface part 30 that is detachable and provided for each size of the loft angle θ constitutes the angle adjustment part that changes the loft angle θ of the face surface 31. For example, the face surface part 30 is provided at an interval of 1° within a range of 0° to 7°.

Note that in a case that the loft angle θ is 0°, the face surface 31 may be the end surface 20a of the head main body 20.

The loft angle θ (see FIG. 3) of the golf club head 12 is measured by a known measuring instrument such as, for example, the golf club head measuring platform manufactured by RISE HILL ENTERPRISE LIMITED, the golf club angle measuring instrument manufactured by GOLFGARAGE Co., Ltd., the golf club gage manufactured by Golfsmith International Holdings Inc, etc. Note that the measuring instrument for the loft angle θ may be any known instrument and is not particularly limited in the invention.

As described above, in the golf club 10 and the golf club head 12, each of the lie angle γ, the loft angle θ, and the offset and the moment of inertia of the face surface 31 (striking surface) can be adjusted independently and individually.

The golf club head 12 is not limited to the above-described golf club head. Next, a second example of the golf club head will be described.

FIG. 9 is a perspective view illustrating the second example of the golf club head of the golf club according to the embodiment of the invention, FIG. 10 is a side view illustrating the second example of the golf club head of the golf club according to the embodiment of the invention, FIG. 11 is an exploded perspective view illustrating the second example of the golf club head of the golf club according to the embodiment of the invention, and FIG. 12 is a side view illustrating a third example of the golf club head of the golf club according to the embodiment of the invention.

Note that in FIGS. 9 to 12, the same reference signs will be assigned to the same components as those of the golf club 10 illustrated in FIGS. 1 to 6, and the detailed description of these components will be omitted. The adjustment weights 24 are not illustrated in FIGS. 9 and 11.

A golf club head 50 illustrated in FIGS. 9 to 11 differs from the golf club head 12 illustrated in FIGS. 1 to 3 in the angle adjustment part, but has the same configuration except this part.

The differences are that a face surface part 60 of the golf club head 50 is not replaceable, and that the sole 37 side of the face surface part 60 can be moved in an opposite direction of the head main body 20 with the top part 31d of the face surface 31 as a fulcrum.

As illustrated in FIGS. 10 and 11, the face surface part 60 includes a face part 60a having the same shape as those of the projecting part 32 and the flat parts 34 of the head main body 20, bent parts 60b provided at respective edges of the face part 60a, and a bent part 60c provided on the bottom surface of the face part 60a. The bent parts 60b are provided with holes 60d into which fixing screws 62 (see FIG. 10) screwed with the screw holes 34b formed on the side surfaces 34a of the flat parts 34 are to be inserted. The bent part 60c is provided with the hole 60d into which a fixing screw (not illustrated) screwed with a screw hole (not illustrated) formed in the sole 37 is to be inserted. The hole 60d is a long hole and allows the movement of the face surface part 60. The hole 60d has a length corresponding to the slide amount of the face surface part 60.

As illustrated in FIG. 10, in the face surface part 60, the bent parts 60b are overlapped on the side surfaces 34a (see FIG. 11) of the flat parts 34 (see FIG. 11), the holes 60d are aligned with the screw holes 34b (see FIG. 11), and the fixing screws 62 are provided in the screw holes 34b. Also, in the bent part 60c, the hole 60d is aligned with the screw hole (not illustrated) formed in the sole 37, and the fixing screw (not illustrated) is screwed with the screw hole.

By doing this, the face surface part 60 is fixed to the head main body 20 by the fixing screws 62. In this case, the loft angle θ of the face surface 31 of the face surface part 60 becomes a predetermined angle. The loft angle θ can be changed by releasing the fixing by the fixing screws 62, rotating the face surface part 60 with the top part 31d as a fulcrum, and fixing the face surface part 60 again by the fixing screws 62. The loft angle θ of the face surface 31 of the face surface part 60 can be changed, for example, within a range of 0° to 7°. In this case, the slide amount of the face surface part 60 is determined in accordance with the range of 0° to 7° of the loft angle θ. The length of the hole 60d is determined in accordance with the range of 0° to 7° of the loft angle θ.

Also, in the golf club head 50, similarly to the golf club 10 and the golf club head 12 described above, each of the lie angle γ, the loft angle θ, and the offset and the moment of inertia of the face surface 31 (striking surface) can be adjusted independently and individually.

In the golf club head 50 illustrated in FIG. 10, when the loft angle θ becomes greater, a gap 61 occurs between the face surface part 60 and the end surface 20a of the head main body 20. Thus, in order to fix the face surface part 60 more firmly, similarly to the golf club head 51 illustrated in FIG. 12, a shim 64 may be provided in the gap 61 between the face part 60a and the end surface 20a of the head main body 20. Note that the golf club head 51 illustrated in FIG. 12 and the golf club head 50 illustrated in FIG. 10 have the same configuration except that the golf club head 51 is provided with the shim 64.

The shim 64 is formed of, for example, engineering plastic such as POM (polyacetal), urethane, aluminum, aluminum alloy, iron, steel, stainless steel, etc.

Although the golf club head 12, the golf club head 50, and the golf club head 51 described above are of the mallet type, there is no limitation to this type, and similarly to the golf club head 70 illustrated in FIG. 13, it is possible to employ a pin type configuration in which a head main body 72 is not provided with the plate-shaped part 38. Also, in the golf club head 70 illustrated in FIG. 13, the adjustment of the moment of inertia by using the adjustment weights 24, the adjustment of the lie angle γ (see FIG. 1), and the adjustment of the loft angle θ (see FIG. 2), and the adjustment of the offset can be performed independently and individually. Also, in the golf club head 70 illustrated in FIG. 13, a similar effect to those of the golf club head 12 and the golf club head 50 described above can be obtained.

In the golf club head 12, the golf club head 50, the golf club head 51, and the golf club head 70 described above, similarly to the lid 25 illustrated in FIG. 14, it is possible to employ a configuration in which lines 25a, 25b, and 25c indicating specific sizes of the lie angle γ (see FIG. 1) are provided. In this case, in the hosel part 22, as illustrated in FIG. 15, the hosel 41 is provided with a line 46 for aligning with the lines 25a, 25b, and 25c indicating the above-described specific sizes of the lie angle γ. This makes it possible to set the lie angle γ to a specific angle by aligning the line 46 provided in the above-described hosel 41 with the lines 25a, 25b, and 25c indicating the above-described specific sizes of the lie angle γ. For example, the line 25a is a line indicating the lie angle γ of 65°, the line 25b is a line indicating the lie angle γ of 72°, and the line 25c is a line indicating the lie angle γ of 77°. In addition, for example, by setting colors for the lines 25a, 25b, and 25c in advance, the lie angle γ can be adjusted more easily.

Note that FIG. 14 is a schematic plan view illustrating the lid of the golf club head of the golf club according to the embodiment of the invention, and FIG. 15 is a schematic plan view illustrating the hosel part of the golf club head of the golf club according to the embodiment of the invention.

In addition, the configuration of the hosel part 22 is not limited to a configuration in which the hosel 41 is formed of the linear member, and may be the configuration illustrated in FIG. 16. Here, FIG. 16 is a perspective view illustrating another example of the hosel part of the golf club head of the golf club according to the embodiment of the invention.

In the hosel part 22 illustrated in FIG. 16, a hosel 47 is not linear but is bent, and includes an attachment part 48d to which the golf club shaft 14 (see FIG. 1) is to be attached. The hosel 47 includes a first member 48a, a second member 48b, a third member 48c, and the attachment part 48d. For example, the first member 48a is formed of a cylindrical member and is connected to the rotor 40. The second member 48b is formed of a cylindrical member. The axis (not illustrated) of the second member 48b is connected orthogonally to the axis (not illustrated) of the first member 48a, and the second member 48b projects to the face surface 31 (see FIG. 2) side. The third member 48c is formed of a cylindrical member, the axis (not illustrated) of the third member 48c is connected orthogonally to the axis (not illustrated) of the second member 48b, and the axis (not illustrated) of the third member 48c is parallel to the axis (not illustrated) of the first member 48a. The attachment part 48d is provided at an end of the third member 48c on the side not connected to the second member 48b. The first member 48a, the second member 48b, and the third member 48c may be integrally formed by bending a single cylindrical member. Note that in a case that the hosel 47 is used, compared with the case of the above-described hosel 41, the golf club shaft 14 (see FIG. 1) is attached to a position projecting from the face surface 31. In this case, the offset refers to the distance F from the lower end 31c of the face surface 31 to the shaft axis S in the direction parallel to the horizontal surface B, as in a golf club head 80 illustrated in FIG. 18, which will be described later. The offset can be changed by changing the length of the second member 48b of the hosel 47.

With the configuration of the hosel 47 illustrated in FIG. 16, even if a part other than the center of the face surface 31 (see FIG. 1) is struck when striking a golf ball, an inclination deviation of the face surface 31 hardly occurs because the face surface 31 is not on the rotational axis (shaft axis S (see FIG. 1)) of the golf club shaft 14 (see FIG. 1). Thus, it is possible to stably strike the golf ball.

A single golf club can be easily made right-handed or left-handed by providing the hosel part 22 in which the attachment position of the hosel 47 to the rotor 40 has been changed. When making a single golf club right-handed or left-handed, in a configuration in which the lid 25 is provided with the lines 25a, 25b, and 25c indicating the specific sizes of the lie angle γ (see FIG. 1), the provided lid 25 is such that the positions at which the lines 25a, 25b, and 25c are provided have been changed for right-handed or left-handed in accordance with the position of the hosel 47.

Although the golf club head 12, the golf club head 50, the golf club head 51, and the golf club head 70 described above have an adjustable loft angle, there is no limitation to this feature.

Here, FIG. 17 is a perspective view illustrating a fifth example of the golf club head of the golf club according to the embodiment of the invention, FIG. 18 is a side view illustrating the fifth example of the golf club head of the golf club according to the embodiment of the invention, and FIG. 19 is a perspective view illustrating the fifth example of the golf club head of the golf club according to the embodiment of the invention viewed from a sole side. Note that in FIGS. 17 to 19, the same reference signs will be assigned to the same components as those of the golf club 10 illustrated in FIGS. 1 to 6, and the detailed description of these components will be omitted. FIG. 19 illustrates the head main body of the golf club head 80, and the adjustment weights 24 (see FIGS. 17 and 18) and the hosel 47 (see FIGS. 17 and 18) are not illustrated in FIG. 19.

The golf club head 80 illustrated in FIGS. 17 to 19 differs from the golf club head 12 illustrated in FIGS. 1 to 3 in that the loft angle θ cannot be adjusted and the shape of the hosel 47 is different, but has the same configuration as that of the golf club head 12 illustrated in FIGS. 1 to 3 except these features.

In the golf club head 80 illustrated in FIGS. 17 to 19, for example, three adjustment weights 24 are provided on one side. The three adjustment weights 24 are fixed by using the fixing screws 82. Note that, as described above, the method for fixing the adjustment weights 24 is not particularly limited. In addition, the number of the adjustment weights 24 is determined, as appropriate, in accordance with the magnitude of the moment of inertia of the golf club head 80. In addition, the lid 25 is fixed by using the screw 84.

The golf club head 80 is such that the loft angle θ cannot be adjusted as described above and the end surface 20a of the head main body 20 forms the face surface 31. The loft angle θ of the golf club head 80 is a fixed angle and is, for example, 2°. Note that the loft angle θ is, for example, 0° to 7° and preferably 2° to 3°. Because the loft angle θ of the golf club head 80 cannot be adjusted, the golf club head 80 needs to be provided for each size of the loft angle θ.

In the golf club head 80, the sole 37 is provided with screw holes 39, and the rotor 40 (see FIGS. 17 and 18) is fixed by screwing fixing screws 86 with the screw holes 39 and pushing up the rotor 40 by the fixing screws 86.

Although the configuration of the golf club head 80 is such that the hosel 47 is used, there is no limitation to this configuration, and the above-described hosel 41 may also be used.

With the golf club head 80, it is also possible to make the center of the golf ball and the center position of the sweet spot closer to each other and get a good feeling of striking. In addition, because the bouncing of the struck golf ball is suppressed, the golf ball is rotated forwardly, the straight advancing ability of the golf ball when being struck is improved, the directionality of the struck ball is improved, and the direction of the struck ball can be adjusted easily.

In addition, with the golf club head 80, the moment of inertia can be increased, the straight advancing ability of the golf ball when being struck can be improved, and high straight advancing ability can be obtained even if a part other than the center of the face surface 31 is struck.

In the golf club head 12, the golf club head 50, the golf club head 51, the golf club head 70, and the golf club head 80 described above, the face surface 31 is, for example, a smooth flat surface having metal gloss, but there is no limitation to this surface. For example, milling using an end mill, etc. may be applied to the face surface 31. Numerous protrusions are formed on the face surface 31 to which the milling has been applied. With the face surface 31 to which the milling has been applied, the feeling of striking is improved by the numerous protrusions, the friction between the face surface 31 and the golf ball is increased by the numerous protrusions, and the direction stability of the struck ball is improved.

By combining the golf club head 12, the golf club head 50, the golf club head 51, the golf club head 70, or the golf club head 80 described above with a thick grip 15, it is possible to stabilize the stroke when striking the golf ball even if the mass of the head is heavy. Note that the length of the golf club shaft 14 is not particularly limited, and is approximately 32 to 35 inches.

The invention is constituted basically as described above. Above, the golf club head and the golf club of the invention have been described; however, the invention is not limited to the embodiment described above and various improvements or modifications may be made within a range which does not depart from the gist of the invention as a matter of course.

REFERENCE SIGNS LIST

• 10 Golf club
• 12, 50 Golf club head
• 14 Golf club shaft
• 15 Grip
• 20, 72 Head main body
• 22 Hosel part
• 24 Adjustment weight
• 25 Lid
• 30 Face surface part
• 30a Face part
• 30b Bent part
• 30c Hole
• 31 Face surface
• 31b Back face
• 32 Projecting part
• 34 Flat part
• 40 Rotor
• 41 Hosel
• B Horizontal surface
• F Distance
• S Shaft axis
• γ Lie angle
• θ Loft angle

Claims

1. A golf club head, comprising:

a head main body including a face surface part constituting a face surface;

a hosel part provided in the head main body and on which the golf club shaft is mounted;

adjustment weights provided in the head main body;

a lie angle adjustment part configured to change a lie angle; and

an offset adjustment part configured to change a distance between the face surface and the hosel part, wherein

the head main body includes a projecting part projecting semi-cylindrically from an upper surface, and flat parts respectively provided on both sides of the projecting part,

the projecting part is provided with the hosel part and the adjustment weights are respectively provided on the flat parts,

a rear surface of the face surface of the projecting part is provided with a wall part along a periphery of the projecting part,

the hosel part includes a rotor provided on a rear surface side of the face surface of the projecting part and rotatable by a predetermined angle, and a hosel provided in the rotor and configured to fix the golf club shaft,

the rotor has a similar outer shape to that of a region surrounded by the wall part,

a spacer can be disposed between the rotor and the projecting part, and the distance between the face surface and the hosel part is adjusted by a thickness of the spacer,

a lid surrounding the region with the wall part is provided, the rotor is accommodated in the region with a plurality of spacers and the lid covers the region, and

the rotor is pushed up by a fixing screw screwed with a sole and is fixed at the predetermined angle to form the lie angle having a specific size.

2. The golf club head according to claim 1, further comprising an angle adjustment part configured to change a loft angle of the face surface.

3. The golf club head according to claim 2, wherein

the face surface part is provided detachably with respect to the head main body, and

a plurality of the face surface parts are provided for respective sizes of the loft angle, and the face surface part corresponding to the loft angle is provided.

4. The golf club head according to claim 2, wherein

the face surface part is provided such that a sole side can be slid with respect to the head main body with a top part of the projecting part as a fulcrum, and the loft angle is adjusted by changing a slide amount of the face surface part.

5. The golf club head according to claim 1, wherein

a plate-shaped part constituting part of a sole is provided on a back face on an opposite side of the face surface of the head main body, and in the plate-shaped part, of a region corresponding to the projecting part and regions corresponding to the flat parts, the region corresponding to the projecting part has a thinner plate thickness.

6. The golf club head according to claim 1, wherein

the adjustment weights are fixed to the flat parts by screws or magnets.

7. (canceled)

8. (canceled)

9. (canceled)

10. The golf club head according to claim 1, wherein

the lid is provided with a line indicating the lie angle having a specific size.

11. A golf club comprising the golf club head according to claim 1.

12. The golf club head according to claim 2, wherein

a plate-shaped part constituting part of a sole is provided on a back face on an opposite side of the face surface of the head main body, and in the plate-shaped part, of a region corresponding to the projecting part and regions corresponding to the flat parts, the region corresponding to the projecting part has a thinner plate thickness.

13. The golf club head according to claim 3, wherein

a plate-shaped part constituting part of a sole is provided on a back face on an opposite side of the face surface of the head main body, and in the plate-shaped part, of a region corresponding to the projecting part and regions corresponding to the flat parts, the region corresponding to the projecting part has a thinner plate thickness.

14. The golf club head according to claim 4, wherein

a plate-shaped part constituting part of a sole is provided on a back face on an opposite side of the face surface of the head main body, and in the plate-shaped part, of a region corresponding to the projecting part and regions corresponding to the flat parts, the region corresponding to the projecting part has a thinner plate thickness.

15. The golf club head according to claim 2, wherein

the adjustment weights are fixed to the flat parts by screws or magnets.

16. The golf club head according to claim 3, wherein

the adjustment weights are fixed to the flat parts by screws or magnets.

17. The golf club head according to claim 4, wherein

the adjustment weights are fixed to the flat parts by screws or magnets.

18. The golf club head according to claim 5, wherein

the adjustment weights are fixed to the flat parts by screws or magnets.

19. The golf club head according to claim 2, wherein

the lid is provided with a line indicating the lie angle having a specific size.

20. The golf club head according to claim 3, wherein

the lid is provided with a line indicating the lie angle having a specific size.

21. A golf club comprising the golf club head according to claim 2.