JP2018094085A - Golf club shaft and golf club - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve feelings in ball hitting while suppressing an increase in shaft weight.SOLUTION: A golf club shaft having the tip which is a head mounting side and the rear end which is a grip mounting side includes: a body layer including a plurality of prepregs constituting the shaft from the tip to the rear end; a reinforcement layer disposed outside with respect to the body layer for reinforcing a region including at least the head mounting place; and an elastic layer disposed between the body layer and the reinforcement layer.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a golf club shaft.

  As a structure of a golf club shaft, a structure in which prepregs are laminated to form a hollow cylinder is known. Such a golf club shaft is advantageous in terms of weight reduction. Patent Documents 1 to 3 propose that a layer that absorbs vibration is provided in the laminated body to improve the feeling at the time of hitting a golfer.

JP 2011-056118 A JP 2006-158880 A JP 2004-275324 A

  Providing a layer that absorbs vibration increases the weight of the shaft. Conventional golf club shafts have room for improvement in terms of improving the feel at impact while suppressing an increase in shaft weight.

  The objective of this invention is improving the feeling at the time of impact, suppressing the increase in a shaft weight.

According to the present invention, for example,
A golf club shaft having a front end that is a mounting side of the head and a rear end that is a mounting side of the grip,
A main body layer including a plurality of prepregs constituting the shaft from the front end to the rear end;
A reinforcing layer that is disposed outside the main body layer and reinforces a region including at least a mounting portion of the head;
An elastic sheet layer disposed between the main body layer and the reinforcing layer,
The reinforcing layer and the elastic sheet layer are disposed closer to the tip than the grip mounting region,
The distance from the rear end to the elastic sheet layer is not more than the distance from the rear end to the reinforcing layer.
A golf club shaft is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the feeling at the time of impact can be improved, suppressing the increase in a shaft weight.

1 is an external view of a golf club according to an embodiment of the present invention. (A) is the II-II sectional view taken on the line of FIG. 1, (B) is the II-II sectional view of FIG. 1, (C) is the III-III sectional view of FIG. FIG. 2 is a development view showing a laminated structure of shafts of the golf club of FIG. (A) And (B) is explanatory drawing of the exposure area | region of an elastic sheet. The expanded view which shows the laminated structure of the shaft of another example.

<First embodiment>
FIG. 1 is an external view of a golf club 1 according to an embodiment of the present invention. The golf club 1 includes a head 2, a grip 3, and a shaft 4. The golf club 1 shown in FIG. 1 is a wood type golf club such as a driver, but the present invention can also be applied to other types of golf clubs such as an iron type golf club and a utility type (hybrid type) golf club. .

  The shaft 4 is a cylindrical rod having a front end 4a and a rear end 4b, and an outer diameter increases from the front end 4a toward the rear end 4b. The total length L0 (length from the front end 4a to the rear end 4b) of the shaft 4 is, for example, 800 mm to 1150 mm. The tip 4a is an end on the mounting side of the head 2, and a range of a distance L1 from the tip 4a is a mounting site inserted into the head 2. The distance L1 is, for example, 25 to 45 mm. The head 2 includes a hosel portion 2a, and the shaft 4 is inserted into the hosel portion 2a from the tip 4a. The shaft 4 and the hosel part 2a are fixed by an adhesive, for example. The rear end 4b is an end on the side where the grip 3 is mounted, and the range of the distance L2 from the rear end 4b is the mounting region of the grip 3. The distance L2 is, for example, 200 to 300 mm.

  2A is a cross-sectional view taken along the line I-I in FIG. 1, and shows a cross-sectional shape of the shaft 4 in the hosel portion 2a. 2B is a cross-sectional view taken along the line II-II in FIG. 1 and shows a cross-sectional shape of the shaft 4 at a position slightly away from the hosel portion 2a toward the rear end 4b. 2C is a cross-sectional view taken along line III-III in FIG. 1, and shows a cross-sectional shape of the shaft 4 at a position further away from the position of the cutting line II-II in FIG. .

  In the case of this embodiment, the structure of the shaft 4 differs depending on the position in the longitudinal direction (axial direction). As shown in FIG. 2A, in the hosel portion 2a, the shaft 4 has a structure roughly divided into a main body layer 4A, an elastic sheet layer 4B, and a reinforcing layer 4C in order from the radially inner side. . As shown in FIG. 2 (B), the structure of the shaft 4 is the same as that of FIG. 2 (A) in a portion near the hosel portion 2a outside the hosel portion 2a. As shown in FIG. 2 (C), the elastic sheet layer 4B and the reinforcing layer 4C are not present in a portion away from the hosel portion 2a, and the shaft 4 is constituted by the main body layer 4A. The reinforcing layer 4 </ b> C is a layer that reinforces the tip 4 a side of the shaft 4, and is partially provided on the shaft 4. And in this embodiment, the shaft 4 is comprised by the main body layer 4A from the site | part of FIG.2 (C) to the rear end 4b, and the main body layer 4A is adjacent to the internal peripheral surface of the grip 3. FIG.

  The vibration at the time of hitting is transmitted from the head 2 to the hand of the golfer through the shaft 4 and the grip 3. In the present embodiment, attention is paid to the vibration transmission in the surface layer (the outer peripheral surface side layer) of the shaft 4 as one of the vibration transmission paths in the shaft 4. As described below, this vibration transmission is performed. By suppressing, vibration transmission to the golfer's hand is reduced.

  The reinforcing layer 4C is adjacent to the inner peripheral surface of the hosel portion 2a, and vibration at the time of impact is input from the hosel portion 2a to the reinforcing layer 4C. The elastic sheet layer 4B is disposed between the main body layer 4A and the reinforcing layer 4C, and vibrations input to the reinforcing layer 4C are transmitted to the main body layer 4A via the elastic sheet layer 4B. Therefore, the vibration transmitted to the main body layer 4A is attenuated by the elastic sheet layer 4B. In the case of the present embodiment, the elastic sheet layer 4B is adjacent to the reinforcing layer 4C on the outer peripheral side and is adjacent to the main body layer 4A on the inner peripheral side. In the case of this embodiment, the elastic sheet layer 4B is disposed so that the reinforcing layer 4C and the main body layer 4A do not directly contact each other. For this reason, the vibration input to the reinforcing layer 4C is not transmitted to the main body layer 4A without passing through the elastic sheet layer 4B.

  The reinforcing layer 4C is located closer to the tip 4a than the grip 3, and vibrations are not directly transmitted from the reinforcing layer 4C to the grip 3. For this reason, the vibration input to the reinforcing layer 4C from the hosel portion 2a is attenuated within the range in which the reinforcing layer 4C is disposed, and is prevented from propagating through the surface layer of the shaft 4 and being transmitted to the golfer. Since the elastic sheet layer 4B is also partially provided at the tip 4a side of the grip 3, an increase in the weight of the shaft 4 can be suppressed. In particular, the elastic sheet layer 4B can further suppress an increase in weight of the shaft 4 by providing the elastic sheet layer 4B within a range in which the contact between the reinforcing layer 4C and the main body layer 4A is cut off.

  FIG. 3 is a development view of components of the shaft 4 and illustrates the structure of the main body layer 4A, the elastic sheet layer 4B, and the reinforcing layer 4C. The shaft 4 is a laminate of a plurality of prepregs 41 to 48 and an elastic sheet 49. In addition, each distance L0-L5 means the distance after winding these.

  The shaft 4 can be manufactured by a sheet winding method, for example. In the sheet winding method, the shaft 4 can be manufactured by winding a plurality of prepregs 41 to 48 and the elastic sheet 49 around a cored bar and heat-curing, and then removing the cored bar.

  Each of the prepregs 41 to 48 is, for example, a sheet in which a reinforcing fiber is impregnated with a matrix resin, and is wound around the core metal one or more times. The thin line in the figure illustrates the fiber direction. Examples of the reinforcing fiber include one or more of carbon fiber, glass fiber, metal fiber, aramid fiber, silicon carbide fiber, alumina fiber, boron fiber, and the like. Moreover, as a matrix resin, 1 or more types, such as an epoxy resin, a phenol resin, and an unsaturated polyester resin, can be mentioned. Further, a curing agent, a curing accelerator, a filler, a release agent, a pigment, and the like can be used as the auxiliary material.

  The elastic sheet 49 is a sheet made of, for example, rubber, urethane resin, silicon resin, or the like. Examples of the rubber material include IIR (butyl bromide composition), NBR (acrylonitrile butadiene rubber), natural rubber, silicon rubber, styrene rubber, and the like. Examples of the urethane resin material include thermoplastic polyurethane. The thickness of the sheet is, for example, 0.05 mm to 0.3 mm. In the case of a rubber material, the thickness is preferably 0.05 mm to 0.2 mm, particularly preferably 0.05 mm to 0.15 mm, from the viewpoint of preventing peeling. In the case of a urethane resin, the thickness is preferably 0.05 mm to 0.2 mm, and particularly preferably 0.05 mm to 0.10 mm in terms of preventing peeling.

  The main body layer 4 </ b> A in the present embodiment is formed by a plurality of prepregs 41 to 46 that are laminated in order from the radially inner side of the shaft 4. The prepreg 41 forms a straight layer whose fiber direction is parallel to the shaft axial direction on the innermost periphery. The prepreg 41 is partially arranged from the front end 4a of the shaft 4 to the rear end 4b side.

  The prepregs 42 to 46 constitute the shaft 4 from the front end 4a to the rear end 4b. The prepregs 42 and 43 form an angle layer in which the fiber direction is inclined with respect to the shaft axial direction. The angle of the fiber direction with respect to the shaft axis direction is, for example, an angle within a range of 30 degrees to 60 degrees, and the angle of the fiber direction with respect to the shaft axis direction is reversed between the prepreg 42 and the prepreg 43. The prepregs 44 to 46 form a straight layer whose fiber direction is parallel to the shaft axial direction.

  The elastic sheet layer 4 </ b> B in the present embodiment is formed by a single elastic sheet 49. The elastic sheet 49 of the present embodiment extends from the rear end 4b to a region from the position of the distance L3 to the front end 4a. In the case of the present embodiment, this region is a region closer to the tip 4a than the grip 3 mounting region (region of distance L2), and includes at least the mounting region of the head 2 (region of distance L1). The elastic sheet layer 4B is adjacent to the main body layer 4A, and the elastic sheet 49 is in contact with the outer peripheral surface of the prepreg 46.

  The reinforcing layer 4 </ b> C in the present embodiment is formed by a plurality of prepregs 47 and 48 that are stacked in order from the radially inner side of the shaft 4. In the case of the present embodiment, the reinforcing layer 4C is formed from the tip 4a to the range of the distance L5. The distance L5 is, for example, 45 mm to 950 mm, or 3% to 83% of the total shaft length L0.

  Each of the prepregs 47 and 48 forms a straight layer whose fiber direction is parallel to the shaft axial direction. The total length of the prepreg 47 in the shaft axial direction is the distance L5, and extends from the position of the distance L4 from the rear end 4b to the region of the front end 4a. In the case of the present embodiment, this region is a region closer to the tip 4a than the grip 3 mounting region (region of distance L2), and includes at least the mounting region of the head 2 (region of distance L1). The reinforcing layer 4C is adjacent to the elastic sheet layer 4B, and the prepreg 47 is in contact with the outer peripheral surface of the elastic sheet 49.

  The prepreg 48 is partially disposed on the tip 4 a side of the shaft 4. In the case of this embodiment, the prepreg 48 extends from the front end 4a toward the rear end 4b, and the total length in the shaft axial direction is, for example, 45 mm to 250 mm, or 3% to 32% of the total shaft length L0.

  Next, the relationship between the elastic sheet layer 4B and the reinforcing layer 4C will be described. The elastic sheet 49 constituting the elastic sheet layer 4B has the same shape as the reinforcing layer 4C or a larger shape than the reinforcing layer 4C. In this embodiment, the contact between the reinforcing layer 4C and the main body layer 4A is cut off. The reinforcing layer 4C is in contact with only the elastic sheet layer 4B on the radially inner side. Specifically, the elastic sheet 49 has the same shape as the prepreg 47 that defines the periphery of the reinforcing layer 4C or a shape larger than the prepreg 47, and the positions thereof have a relationship of distance L3 ≦ L4. The distances L3 and L4 are, for example, 200 mm to 1105 mm, or 17% to 97% of the total shaft length L0. In the case of this embodiment, the elastic sheet 49 is longer than the prepreg 47 in the entire length in the shaft axial direction.

  FIG. 4A shows a state where the elastic sheet 49 and the prepreg 47 are overlapped. In the manufacturing process of the shaft 4, as shown in FIG. 4A, an elastic sheet 49 and a prepreg 47 can be preliminarily stacked and wound around a core member around which the main body layer 4A is wound. The elastic sheet 49 entirely overlaps with the prepreg 47, and has an exposed portion 49a protruding from the prepreg 47 by a width W at the end on the rear end 4b side. The width W is, for example, 0 mm <W ≦ 15 mm.

  FIG. 4B shows a partial appearance of the completed shaft 4 and shows the vicinity of the exposed portion 49a. The exposed portion 49a is also exposed from the prepreg 47 (reinforcing layer 4C) in the completed shaft 4. The edge on the rear end 4b side of the exposed portion 49a is inclined with respect to the shaft axis. By providing the exposed portion 49a, it is possible to more reliably avoid contact between the reinforcing layer 4C and the main body layer 4A in the shaft axial direction. Thereby, it can further reduce that a vibration propagates in the surface layer of the shaft 4 at the time of a hit | damage, and is transmitted to a golfer's hand.

  In the vicinity of the exposed portion 49 a, a minute step (a step between the prepreg 47 and the elastic sheet 49, a step between the elastic sheet 49 and the prepreg 46) may occur during the manufacturing process of the shaft 4. However, this step is eliminated by surface polishing in the finishing process of the shaft 4, and the outer peripheral surface of the shaft 4 is made flush (smooth). Since the edge on the rear end 4b side of the exposed portion 49a is inclined with respect to the shaft axis line, it becomes easy to finish flush, and stress applied to the edge on the rear end 4b side of the prepreg 47 can be dispersed. .

<Second embodiment>
In the first embodiment, the set of the reinforcing layer and the elastic sheet layer is disposed on the mounting portion side of the head 2, but a similar structure may be disposed on the mounting region side of the grip 3. FIG. 5 is a development view of components of the shaft 4 ′ showing an example thereof. Hereinafter, a configuration different from the first embodiment will be described.

  The shaft 4 'of the present embodiment is provided with a reinforcing layer 4D, and the elastic sheet layer 4B is formed at a position overlapping the reinforcing layer 4D. The reinforcing layer 4 </ b> D in the present embodiment is formed for the purpose of reinforcing the proximal side of the shaft 4 ′, and is formed by a single prepreg 50. In the case of the present embodiment, the reinforcing layer 4D is formed from the rear end 4b to the range of the distance L6. The distance L6 is, for example, 200 mm to 1105 mm, or 17% to 97% of the total shaft length L0.

  The prepreg 50 forms a straight layer whose fiber direction is parallel to the shaft axial direction. The total length of the prepreg 50 in the shaft axial direction is a distance L6, and extends from the tip 4a to a region from the position L4 'to the rear end 4b. In the case of the present embodiment, this region is a region closer to the rear end 4b than the mounting portion of the head 2 (the portion of the distance L1), and includes at least the mounting region of the grip 3 (the region of the distance L2). The reinforcing layer 4D is adjacent to the elastic sheet layer 4B, and the prepreg 50 is in contact with the outer peripheral surface of the elastic sheet 49 '.

  The elastic sheet layer 4B in the present embodiment is formed by a single elastic sheet 49 '. The elastic sheet 49 'of the present embodiment extends from the front end 4a to a region from the position at a distance L3' to the rear end 4b. In the case of the present embodiment, this region is a region closer to the rear end 4b than the mounting portion of the head 2 (the portion of the distance L1), and includes at least the mounting region of the grip 3 (the region of the distance L2). The elastic sheet layer 4B is adjacent to the main body layer 4A, and the elastic sheet 49 'is in contact with the outer peripheral surface of the prepreg 46.

  Next, the relationship between the elastic sheet layer 4B and the reinforcing layer 4D will be described. The elastic sheet 49 ′ constituting the elastic sheet layer 4B has the same shape as the reinforcing layer 4D or a larger shape than the reinforcing layer 4D, and in this embodiment, the contact between the reinforcing layer 4D and the main body layer 4A is cut off. The reinforcing layer 4D is in contact with only the elastic sheet layer 4B on the radially inner side. Specifically, the elastic sheet 49 ′ has the same shape as the prepreg 50 that defines the periphery of the reinforcing layer 4D or a shape larger than the prepreg 50, and the positions thereof have a relationship of distance L3 ′ ≦ L4 ′. . The distances L3 'and L4' are, for example, 45 mm to 950 mm, or 3% to 83% of the total shaft length L0. In the present embodiment, the elastic sheet 49 ′ is longer than the prepreg 50 in the entire length in the shaft axial direction.

  In the case of this embodiment, vibration at the time of impact is input from the hosel portion 2a to the reinforcing layer 4C. Unlike the first embodiment, since the elastic sheet layer 4B is not disposed between the main body layer 4A and the reinforcing layer 4C, the vibration input to the reinforcing layer 4C is transmitted to the main body layer 4A, and the surface layer of the shaft 4 Proceed to the side of the golfer. However, in the attachment region of the grip 3, the elastic sheet layer 4B and the reinforcing layer 4D are laminated, and the vibration propagated through the main body layer 4 is transmitted to the reinforcing layer 4D through the elastic sheet layer 4B. Therefore, the vibration transmitted to the reinforcing layer 4D is attenuated by the elastic sheet layer 4B. In the case of the present embodiment, the elastic sheet layer 4B is adjacent to the reinforcing layer 4D on the outer peripheral side and adjacent to the main body layer 4A on the inner peripheral side. In the present embodiment, the elastic sheet layer 4B is disposed so that the reinforcing layer 4D and the main body layer 4A do not directly contact each other. For this reason, the vibration propagated through the main body layer 4A is not transmitted to the reinforcing layer 4D without passing through the elastic sheet layer 4B.

  For this reason, it is suppressed that the vibration propagated through the main body layer 4A is transmitted to the hand of the golfer. Since the elastic sheet layer 4 </ b> B is partially provided in the part on the rear end 4 b side than the head 2, an increase in the weight of the shaft 4 can be suppressed. In particular, the elastic sheet layer 4B only needs to be provided within a range in which the contact between the reinforcing layer 4D and the main body layer 4A is cut off, so that an increase in the weight of the shaft 4 can be further suppressed.

  FIG. 5 also shows a state in which the elastic sheet 49 ′ and the prepreg 50 are overlapped. In the manufacturing process of the shaft 4, as shown in FIG. 5, the elastic sheet 49 ′ and the prepreg 50 can be preliminarily stacked and wound around the core member around which the main body layer 4 </ b> A is wound. The elastic sheet 49 ′ overlaps with the prepreg 50 as a whole and has an exposed portion 49 a ′ that protrudes from the prepreg 50 by a width W ′ at the end on the front end 4 a side. The width W ′ is, for example, 0 mm <W ≦ 15 mm.

  This exposed portion 49 'also exhibits the same effect as the exposed portion 49 described with reference to FIGS. 4 (A) and 4 (B). Similarly to the first embodiment, the step between the layers is eliminated by surface polishing in the finishing process of the shaft 4, and the outer peripheral surface of the shaft 4 is made flush (smooth). As in the first embodiment, the edge on the tip 4a side of the exposed portion 49a ′ is inclined with respect to the shaft axis, so that it becomes easier to finish flush and the stress applied to the edge on the tip 4a side of the prepreg 50. Can be dispersed.

1 golf club, 2 heads, 3 grips, 4 shafts

Claims (9)

A golf club shaft having a front end that is a mounting side of the head and a rear end that is a mounting side of the grip,
A main body layer including a plurality of prepregs constituting the shaft from the front end to the rear end;
A reinforcing layer that is disposed outside the main body layer and reinforces a region including at least a mounting portion of the head;
An elastic sheet layer disposed between the main body layer and the reinforcing layer,
The reinforcing layer and the elastic sheet layer are disposed closer to the tip than the grip mounting region,
The distance from the rear end to the elastic sheet layer is not more than the distance from the rear end to the reinforcing layer.
A golf club shaft characterized by that. The golf club shaft according to claim 1,
An end portion on the rear end side of the elastic sheet layer is exposed from the reinforcing layer.
A golf club shaft characterized by that. The golf club shaft according to claim 1,
The reinforcing layer is adjacent to only the elastic sheet layer in the radial direction of the shaft,
A golf club shaft characterized by that. The golf club shaft according to claim 1,
The elastic sheet layer is a rubber sheet or a urethane resin sheet.
A golf club shaft characterized by that. The golf club shaft according to claim 1,
The outer peripheral surface of the shaft is flush.
A golf club shaft characterized by that. The golf club shaft according to claim 1,
The edge on the rear end side of the elastic sheet layer is inclined with respect to the axis of the shaft.
A golf club shaft characterized by that. A golf club shaft having a front end that is a mounting side of the head and a rear end that is a mounting side of the grip,
A main body layer including a plurality of prepregs constituting the shaft from the front end to the rear end;
A reinforcing layer that is disposed outside the main body layer and reinforces an area including at least a mounting area of the grip;
An elastic sheet layer disposed between the main body layer and the reinforcing layer,
The reinforcing layer and the elastic sheet layer are disposed on the rear end side with respect to the mounting portion of the head,
The distance from the tip to the elastic sheet layer is not more than the distance from the tip to the reinforcing layer,
A golf club shaft characterized by that. A golf club comprising a head, a grip, and a shaft having a front end that is a mounting side of the head and a rear end that is a mounting side of the grip,
The shaft is
A main body layer including a plurality of prepregs constituting the shaft from the front end to the rear end;
A reinforcing layer that is disposed outside the main body layer on the tip side of the grip and reinforces a region including at least a mounting portion of the head;
An elastic sheet layer that is disposed between the main body layer and the reinforcing layer on the tip side of the grip and cuts off contact between the main body layer and the reinforcing layer;
A golf club characterized by that. A golf club comprising a head, a grip, and a shaft having a front end that is a mounting side of the head and a rear end that is a mounting side of the grip,
The shaft is
A main body layer including a plurality of prepregs constituting the shaft from the front end to the rear end;
A reinforcing layer that is disposed outside the body layer on the rear end side of the head mounting portion and reinforces a region including at least the grip mounting region;
An elastic sheet layer disposed between the main body layer and the reinforcing layer on the rear end side of the mounting portion of the head and breaking the contact between the main body layer and the reinforcing layer;
A golf club characterized by that.

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