Sleeve system and fitting method

Abstract

To provide a sleeve system for a golf club that has high strength, and does not impair a hitting feeling.SOLUTION: A sleeve system S for a golf club 1 according to an embodiment comprises: a head 2 in which a circular hole 22 is drilled along a central axis of a hosel 21, and which has a female screw groove 22a engraved only in a predetermined range on an inlet side of an inner surface of the circular hole 22; and a sleeve 3 into which a tip of a shaft 4 is inserted, bonded, and fixed, and which has a knob part 31 located closest to a base end side, and to be held by a hand, a male screw groove 32 adjacent to the knob part 31, engraved only in a predetermined range of an outer surface, and screwed to the female screw groove 22a, and a contact part 33 located closest to a tip side, and in contact with the inner surface of the circular hole 22.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a sleeve system for a golf club.

Background Art

[0002] Conventionally, in an iron club, since the hosel portion of the iron head and the end face of the shaft are generally adhered with an adhesive, the same number of shafts as the number of iron heads are prepared at a fitting shop. This was the same even when different shafts were attached to the same iron head.

[0003] On the other hand, due to cost and storage space considerations, it was difficult to prepare all combinations of iron heads and shafts at a fitting shop. Therefore, for example, Patent Document 1 describes a golf club in which the combination of a shaft and a head is interchangeable, and a double fastening device for an iron head and a shaft in which the lower end and the upper end of a sleeve provided on the shaft are fixed to the iron head.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in a normal golf club, the upper part of the inner surface of a circular hole is adhered, and there is no play in the upper part of the inner surface of the circular hole. However, in the conventional technology including the double fastening device described in Patent Document 1, the tip of the shaft is fixed to the bottom of the circular hole provided in the hosel, and there is play in the upper part of the inner surface of the circular hole. Therefore, in the conventional technology, there is a problem that the strength of the golf club is reduced and the hitting feel is impaired.

[0006] Therefore, an object of the present invention is to provide a sleeve system for a golf club that has high strength and does not impair the hitting feel.

Means for Solving the Problems

[0007] To achieve the above object, a sleeve system for a golf club according to the present invention is a sleeve system for a golf club; a head in which a circular hole is drilled along the central axis of the hosel, the head having a female screw groove engraved only in a predetermined range on the entrance side of the inner surface of the circular hole; a sleeve into which the tip of the shaft is inserted and adhesively fixed, the sleeve having a grip portion that is located at the most proximal end and is gripped by hand, a male screw groove that is engraved only in a predetermined range on the outer surface adjacent to the grip portion and that engages with the female screw groove, and a contact portion that is located at the most distal end and contacts the inner surface of the circular hole.

Effects of the Invention

[0008] Thus, the sleeve system for a golf club according to the present invention is; a head in which a circular hole is drilled along the central axis of the hosel, the head having a female screw groove engraved only in a predetermined range on the entrance side of the inner surface of the circular hole; a sleeve into which the tip of the shaft is inserted and adhesively fixed, the sleeve having a grip portion that is located at the most proximal end and is gripped by hand, a male screw groove that is engraved only in a predetermined range on the outer surface adjacent to the grip portion and that engages with the female screw groove, and a contact portion that is located at the most distal end and contacts the inner surface of the circular hole. Since this sleeve system has such a configuration, it is possible to provide a golf club that has high strength and does not impair the hitting feel.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the components described in the following examples are examples, and are not intended to limit the technical scope of the present invention thereto.

Example

[0011] (Configuration) First, the overall configuration of the golf club 1 including the sleeve system S of the present invention will be described with reference to FIG. 1. As shown in FIG. 1, the golf club 1 of this embodiment mainly includes a head 2, a sleeve 3, and a shaft 4. Here, as the golf club 1 including the sleeve system S, an iron and a utility (rescue) can be considered.

[0012] The golf club 1 of this embodiment is configured such that the shaft 4 can be detachably (replaceably) attached to the head 2 via the sleeve 3 as described in detail below. That is, the sleeve 3 is adhesively fixed near the lower end of the shaft 4, and by screwing the sleeve 3 into the hosel 21 of the head 2, the combination of the head 2 and the shaft 4 can be changed.

[0013] As shown in FIG. 2, the head 2 is mainly composed of a main body portion 20 having a face surface 20a and a cylindrical (cylindrical) hosel 21 formed integrally with the main body portion 20 and attached to the shaft 4 (sleeve 3). The material of the head 2 is not limited, but for example, it is preferably made of soft iron or stainless steel.

[0014] Then, in the nozzle 21 of the head 2 of this embodiment, a circular hole 22 is formed by drilling. The drilling depth to the bottom 22c of this circular hole 22 is adjusted so that the weight of the chips (cutting chips; drilling chips) and the weight of the sleeve 3 are substantially the same. And on the upper part of the inner surface of the circular hole 22, a female thread groove 22a that engages with the male thread groove 32 of the sleeve 3 is formed.

[0015] More specifically, the inside of the circular hole 22 drilled in the nozzle 21 is formed by a female thread groove 22a engraved at the uppermost part and a smooth contact surface 22b without unevenness that is located at the lower part of the thread groove 23a and contacts (abuts) the outer peripheral surface of the sleeve 3 without a gap.

[0016] As shown in FIGS. 2 and 3, the sleeve 3 is a cylindrical alloy part fixed to the tip of the shaft 4 with an adhesive. That is, the tip of the shaft 4 is inserted into the through hole 30 of the sleeve 3 and adhesively fixed. And the shaft 4 is detachably fixed to the head 2 via this sleeve 3.

[0017] Specifically, as shown in FIG. 4, the sleeve 3 is a cylindrical sleeve 3 into which the tip of the shaft 4 is inserted and adhesively fixed. On its outer peripheral surface, there are a grip portion 31 that is at the most proximal end side and is gripped by hand, a male thread groove 32 that is engraved only in a predetermined range of the outer surface adjacent to the grip portion 31 and engages with the female thread groove 22a, and a contact portion 33 that is at the most distal end side and abuts against the inner surface (22b) of the circular hole 22.

[0018] The thread crest of the male thread groove 32 of this sleeve 3 and the female thread groove 22a of the head 2 are made into a left-handed (left thread) with an M11 pitch of 0.75 mm so that when a right-handed batter (player) hits, the thread tightens and it is less likely to cause problems. Of course, it can also be made into a right-handed right thread for left-handed batters.

[0019] And the sleeve 3 of this embodiment has its weight calculated. That is, the weight difference between the case of using this sleeve system S and the case of bonding the hosel 21 and the shaft 4 is eliminated. That is, it is designed such that the weight of the drilling chips generated during drilling and the weight of the sleeve 3 are substantially the same.

[0020] And where there are differences in the diameter and weight due to the material of the holes originally in the hosel 21, in the sleeve system S of this embodiment, the error is adjusted according to the drilling depth of the circular hole on the hosel 21 side.

[0021] Specifically, originally, the weight of the sleeve 3 is designed to be substantially the same as the weight of the chips during drilling. However, if the same drilling depth is used, errors will occur due to the size of the hole diameter and the density of the head material depending on the manufacturer and the head. Therefore, by adjusting the drilling depth, it is made to be the same as the weight of the original head 2. Conversely, the weight of the sleeve 3 that is uniformly used for each manufacturer and each club is substantially the same as the average weight or slightly heavier. Adjusting the weight in this way so that there is no difference in the feeling of use is one of the major features of this sleeve system S.

[0022] Also, in the sleeves (3) of other companies, it is common for the fixed part to be on the tip side of the sleeve, and there is a concern about rigidity. However, in the sleeve system S of this embodiment, since there is a thread groove 32 (22a) at the upper part, the rigidity is high and the hitting feeling is not impaired.

[0023] The shaft 4 is a rod-shaped body that connects the head 2 and the grip, and there are a steel shaft made of a metal (alloy) material and a carbon shaft made of carbon fiber. Generally, a carbon shaft is often attached to a driver, and for other clubs, a steel shaft or a carbon shaft can often be selected. The sleeve 3 is adhesively fixed to the lower end of the shaft 4

[0024] (Manufacturing method of the head) The machining of the head is carried out by sequentially performing the following steps (1) to (4).

[0025] (1) Preparation: Fix to the measuring / jig The hose 21 of the general head 2 has a non-uniform shape, a low roundness, about 0.3 mm, and is an ellipse with different lengths of the major axis and the minor axis. It also has a tapered shape in the longitudinal direction. Moreover, there are individual differences even among the heads of the same manufacturer at present.

[0026] Therefore, in order to perform accurate cutting, since there are various hose shapes from each company, the hose is measured, and a fixing jig suitable for it is selected. Then, the head 2 is fixed to the cutting machine (milling machine) via the fixing jig.

[0027] After that, based on the outer shape of the hose 21, the center position of the shape is determined with an accurcenter (measuring instrument). The machining error from the center of the circle is about 0.05 mm for precise machining. Separately from this, the previously prepared sleeve 3 is fixed to the tip of the shaft 4 with an adhesive.

[0028] (2) Cutting Since the iron head 2 contains a lot of soft iron and is relatively soft, it is easily damaged during machining. Therefore, it is fixed to the fixing jig for accurate machining. In order to reduce the cutting resistance, the hole machining is carried out in two steps.

[0029] Specifically, after drilling a hole with a small diameter as follows, then drill a hole with a large diameter. · First time: Use an end mill with a diameter of φ10 mm. · Second time: Use an end mill with a diameter of φ10.4 mm. The machining depth is cut to about 29 mm. However, this machining depth (drilling depth) is adjusted so that the weight of the sleeve 3 and the weight of the chips are the same.

[0030] (3) Thread machining Machine it accurately coaxially. Since it is necessary to perform the machined hole and the screw machining concentrically and coaxially, while fixing the head 2 as it is, attach a screw cutting tool (M11 0.75 left tap) to the milling machine and cut a screw to a depth of about 15 mm

[0031] (4) Finishing For the purpose of making the detachment and attachment smooth, in order to remove the burrs that can be formed when performing screw machining, rework the φ10.4 hole with a hand reamer. Finally, perform an appearance check and finish

[0032] (Regarding the detachment and attachment of the head and the shaft) The detachment and attachment of the head 2 and the shaft 4 are performed while holding the head 2 and the shaft 4 by hand. That is, the sleeve 3 fixed near the lower end of the shaft 4 is screwed into the circular hole 22 provided in the nozzle 21 of the head 2 counterclockwise, or removed clockwise

[0033] This detachment and attachment do not require a dedicated tool, and the operation itself is extremely smooth. Very rarely, there may be a case where the head 2 and the sleeve 3 cannot be removed, but even in that case, it can be removed by a tool while using the vertical groove of the grip portion 31 of the sleeve 3

[0034] (Function and effect) Next, the function and effect of the sleeve system S of this embodiment will be described

[0035] (1) As described above, the sleeve system S for the golf club 1 of the present embodiment includes: a head 2 having a circular hole 22 drilled along the central axis of the hosel 21 and having a female screw groove 22a threaded only in a predetermined range on the inlet side of the inner surface of the circular hole 22; and a sleeve 3 into which the tip of the shaft 4 is inserted and adhesively fixed, the sleeve 3 having a grip portion 31 at the most proximal end and being gripped by hand, a male screw groove 32 threaded only in a predetermined range on the outer surface adjacent to the grip portion 31 and screwed into the female screw groove 22a, and a contact portion 33 at the most distal end that contacts the inner surface of the circular hole 22. Since the sleeve system S has such a configuration, it is possible to provide a golf club 1 with high strength and no loss of hitting feeling. This is achieved by fixing only the base (upper part; closer to the grip) inside the circular hole 22 to the sleeve 3 on the shaft 4 side.

[0036] That is, by using the sleeve system S of the present embodiment, the combination of the head 2 and the shaft 4 can be changed, so the storage space for the head 2 and the shaft 4 in the fitting shop can be omitted. Furthermore, by processing the already-owned trial clubs, the trial clubs can be utilized without being wasted. In addition, compared with the prior art, it is possible to provide a golf club 1 with high strength and no loss of hitting feeling.

[0037] In addition, it has the following effects. · The weight does not change: For example, for the weight of the sleeve 3 being 5 g, the machining removal is also 5 g of the same weight, so there is no weight change. · Can be attached and detached by simply turning: Since no tools are required, it can be easily attached and detached anywhere. · Future reduction of shaft costs: The currently used shaft can be used with various heads. Therefore, the fitting range can be widened and the trial clubs can be enriched. · Thorough cost management: The sleeve 3 is manufactured with cost being the top priority.

[0038] (2) Further, the female screw groove 22a engraved on the inner surface of the circular hole 22 of the head 2 and the male screw groove 32 engraved on the outer surface of the sleeve 3 are preferably left-handed screws that are screwed together. Therefore, even if a right-handed person hits the ball, the head 2 will not loosen with respect to the sleeve 3.

[0039] (3) Furthermore, the drilling depth of the circular hole 22 is adjusted so that the weight of the chips and the weight of the sleeve 3 are substantially the same. Therefore, the weight can be easily adjusted, and there is no difference in the feeling of use.

[0040] (4) And the fitting method of this embodiment is a fitting method using the sleeve system S as described above. It includes a step of adhesively fixing the sleeve 3 to the tip of the shaft 4, a step of fixing the head 2 using a fixing jig, a step of drilling a circular hole 22 in the head 2, a step of threading the female screw groove 22a while fixing the head 2 using the fixing jig, and a step of screwing the sleeve 3 and the head 2 together. Since this fitting method includes such steps, it is possible to provide the golf club 1 with high strength and no loss of hitting feeling. And it can be used for fitting using the golf club 1 with high strength and no loss of hitting feeling.

[0041] Among these, the step of drilling the circular hole includes a step of adjusting the drilling depth so that the weight of the chips generated when drilling the circular hole and the weight of the sleeve 3 are substantially the same. Therefore, the weight can be easily adjusted, and there is no difference in the feeling of use.

[0042] As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes that do not deviate from the gist of the present invention are included in the present invention.

Explanation of Reference Numerals

[0043] S Sleeve system 1 Golf club 2 Head 20 Body part 20a Face surface 21 Hose 22 Circular hole 22a Female thread groove 22b Contact surface 22c Bottom 3 Sleeve 30 Through hole 31 Knob part 32 Male thread groove 33 Contact part 4 Shaft

Claims

1. In a sleeve system for a golf club; A head having a circular hole drilled along the central axis of the hosel, the head having a female screw groove threaded only in a predetermined range on the inlet side of the inner surface of the circular hole; A sleeve into which the tip of the shaft is inserted and adhesively fixed, having a grip portion at the most proximal end that is gripped by hand, a male screw groove threaded only in a predetermined range on the outer surface adjacent to the grip portion and screwed into the female screw groove, and a contact portion at the most distal end that contacts the inner surface of the circular hole; A sleeve system comprising:

2. The sleeve system according to claim 1, wherein the female screw groove threaded on the inner surface of the circular hole of the head and the male screw groove threaded on the outer surface of the sleeve are left-handed screws that are screwed together.

3. The sleeve system according to claim 1 or claim 2, wherein the drilling depth of the circular hole is adjusted so that the weight of the chips and the weight of the sleeve are substantially the same.

4. A fitting method using the sleeve system according to claim 3, comprising: Adhesively fixing the sleeve to the tip of the shaft; Fixing the head using a fixing jig; Drilling the circular hole in the head; Threading the female screw groove while fixing the head using the fixing jig; Screwing the sleeve and the head together. A fitting method comprising:

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