Sleeve system and fitting method

Abstract

To provide a sleeve system for a golf club which is strong and does not impair a hitting feeling. [Solution] The sleeve system S for a golf club 1 in this embodiment comprises: a head 2 in which a circular hole 22 is drilled along the central axis of a hosel 21, the head 2 having a female thread groove 22a that is threaded only in a predetermined range on the entrance side of the inner surface of the circular hole 22; and a sleeve 3 into which the tip of a shaft 4 is inserted and adhesively fixed, the sleeve 3 having a knob portion 31 at the base end side that is held by hand, a male thread groove 32 adjacent to the knob portion 31 that is threaded only in a predetermined range on the outer surface and screws into the female thread groove 22a, and an abutment portion 33 at the tip end side that abuts against the inner surface of the circular hole 22.

Description

[Technical field]

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

[0002] Conventionally, in an iron club, the hosel portion of the iron head is generally bonded to the end face of the shaft with an adhesive, so that the fitting shop has prepared the same number of shafts as the number of iron heads, even when different shafts are attached to the same iron head.

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

[0004] [Patent Document 1] Patent Publication No. 2021-94401 Summary of the Invention [Problem to be solved by the invention]

[0005] In a normal golf club, the upper part of the inner surface of the circular hole is glued, 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 part of the shaft is fixed to the bottom part of the circular hole provided in the hosel, and play occurs in the upper part of the inner surface of the circular hole. Therefore, in the conventional technology, there are problems in that the strength of the golf club is reduced and the hitting feeling is impaired.

[0006] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a sleeve system for a golf club which is strong and does not impair the feel when hitting the ball. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the sleeve system for a golf club of the present invention is a sleeve system for a golf club, comprising: a head in which a circular hole is drilled along the central axis of a hosel, the head having a female thread groove that is threaded only into a predetermined range on the inner surface of the entrance side of the circular hole; and a sleeve into which the tip of a shaft is inserted and adhesively fixed, the sleeve having a knob portion located at the base end side and held by hand, a male thread groove that is threaded only into a predetermined range on the outer surface adjacent to the knob and screws into the female thread groove, and an abutment portion located at the tip end side and abutting the inner surface of the circular hole. Effect of the Invention

[0008] Thus, the sleeve system for a golf club of the present invention comprises: a head having a circular hole drilled along the central axis of a hosel, the head having a female screw groove that is threaded only in a predetermined range on the inner surface of the circular hole at the entrance side, and a sleeve into which the tip of a shaft is inserted and fixed with adhesive, the sleeve having a knob portion located at the most base end side and held by hand, a male screw groove that is threaded only in a predetermined range on the outer surface adjacent to the knob and screws into the female screw groove, and an abutment portion located at the most tip side and abutting against the inner surface of the circular hole. Because this sleeve system has such a configuration, it is possible to provide a golf club that is strong and does not impair the feel of the hit. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view illustrating an overall configuration of a golf club. [Diagram 2] FIG. 2 is a perspective view illustrating a configuration of a sleeve system. [Diagram 3] 4A to 4C are cross-sectional views illustrating the operation of the sleeve system. [Figure 4]1A and 1B are explanatory views for explaining the configuration of a sleeve, in which (a) is a side view and (b) is a plan view. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0011] (composition) First, the overall configuration of a golf club 1 equipped with a 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 is mainly composed of a head 2, a sleeve 3, and a shaft 4. Here, the golf club 1 equipped with the sleeve system S may be an iron or a utility club (rescue).

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

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

[0014] In the hosel 21 of the head 2 of this embodiment, a circular hole 22 is formed by drilling. The drilling depth to the bottom 22c of the circular hole 22 is adjusted so that the weight of the shavings (cutting shavings; drilling shavings) and the weight of the sleeve 3 are approximately equal. A female screw groove 22a that screws into the male screw groove 32 of the sleeve 3 is formed in the upper part of the inner surface of the circular hole 22.

[0015] More specifically, the inside of the circular hole 22 drilled in the hosel 21 is formed from a female screw groove 22a threaded at the top and a smooth abutment surface 22b without any irregularities that is located at the bottom of the screw groove 23a and makes contact (abuts) with the outer peripheral surface of the sleeve 3 without any gaps.

[0016] 2 and 3, the sleeve 3 is a cylindrical alloy part that is 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 fixed with an adhesive. The shaft 4 is fixed to the head 2 via the sleeve 3 in a replaceable manner.

[0017] Specifically, as shown in FIG. 4, the sleeve 3 is a cylindrical sleeve into which the tip of the shaft 4 is inserted and adhesively fixed, and its outer surface has a knob portion 31 located at the base end side to be gripped by hand, a male screw groove 32 adjacent to the knob portion 31 and threaded only over a predetermined range of the outer surface to screw into the female screw groove 22a, and an abutment portion 33 located at the tip end side to abut against the inner surface (22b) of the circular hole 22.

[0018] The threads of the male screw groove 32 of the sleeve 3 and the female screw groove 22a of the head 2 are M11 pitch 0.75 mm left-handed (left-handed thread), so that when a right-handed batter (player) hits the ball, the screws tighten and are less likely to cause problems. Of course, it is also possible to make them right-handed threads for left-handed batters.

[0019] The weight of the sleeve 3 of this embodiment is also calculated. That is, the weight difference between the case where this sleeve system S is used and the case where the hosel 21 and the shaft 4 are bonded is eliminated. In other words, it is designed so that the weight of the drilling waste generated during drilling is approximately the same as the weight of the sleeve 3.

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

[0021] Specifically, the weight of the sleeve 3 is designed to be approximately the same as the weight of the shavings produced during drilling. However, if the same drilling depth is used, there will be errors due to the size of the hole diameter and the density of the head material depending on the manufacturer and head. For this reason, the drilling depth is adjusted so that it is the same as the original weight of the head 2. Conversely, the weight of the sleeve 3 used uniformly for each manufacturer and each club is approximately the same as the average weight, or is slightly heavier. By adjusting the weight in this way, it is possible to use it without any difference in the feel, which is one of the major features of this Sleeve System S.

[0022] Also, with other companies' sleeves (3), the fixing point is often at the tip of the sleeve, which can cause concerns about rigidity. However, the sleeve system S of this embodiment has a screw groove 32 (22a) at the top, which provides high rigidity and does not impair the feel of the hit.

[0023] The shaft 4 is a rod-shaped body that connects the head 2 and the grip, and is available in steel shafts made of metal (alloy) materials and carbon shafts made of carbon fiber. Generally, drivers are often fitted with carbon shafts, and for other clubs, either steel or carbon shafts can be selected. A sleeve 3 is glued and fixed to the lower end of the shaft 4.

[0024] (Head processing method) The head is processed by carrying out the following steps (1) to (4) in order.

[0025] (1) Preparation: Measurement / fixing to jig The hosel 21 of a typical head 2 has an uneven shape, has low roundness, is an ellipse with a difference in length between the major axis and the minor axis by about 0.3 mm, and is tapered in the vertical direction. Furthermore, there are individual differences even in heads from the same manufacturer.

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

[0027] After that, the center position of the shape is calculated based on the outer shape of the hosel 21 using an accu-center (measuring device). The machining error from the center of the circle is precise and is about 0.05 mm. Separately from this, a sleeve 3 that has been prepared in advance is fixed to the tip of the shaft 4 with an adhesive.

[0028] (2)Cutting processing The iron head 2 is relatively soft because it contains a lot of soft iron, so it is easily scratched during processing. Therefore, it is fixed to a fixing jig and processed accurately. To reduce cutting resistance, hole processing is performed in two steps.

[0029] Specifically, a small diameter hole is first drilled and then a large diameter hole is drilled as follows. 1st time: Use a φ10mm end mill. Second time: Use a φ10.4mm end mill. The cutting depth is about 29 mm. However, this cutting depth (hole depth) is adjusted so that the weight of the sleeve 3 and the weight of the shavings are the same.

[0030] (3) Screw processing The machined hole and the screw must be machined concentrically, so while fixing the head 2, attach a thread cutting tool (M11 0.75 left tap) to the milling machine and cut the screw to a depth of about 15 mm.

[0031] (4) Finishing In order to facilitate smooth installation and removal, the φ10.4 hole is re-machined with a hand reamer to remove burrs that may have been created during thread processing. Finally, the appearance is checked and the process is completed.

[0032] (Removing and attaching the head and shaft) The head 2 and the shaft 4 are attached and detached 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 hosel 21 of the head 2 by turning it counterclockwise, or removed by turning it clockwise.

[0033] No special tools are required for this removal and installation, and the work itself is extremely smooth. In the very rare case where the head 2 and sleeve 3 cannot be removed, the sleeve 3 can still be removed with a tool by utilizing the vertical groove of the knob 31 of the sleeve 3.

[0034] (Action and effect) Next, the actions and effects 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 this embodiment includes: a head 2 in which a circular hole 22 is drilled along the central axis of a hosel 21, the head 2 having a female screw groove 22a that is threaded only in a predetermined range on the inner surface of the circular hole 22 at the entrance; and a sleeve 3 into which a tip of a shaft 4 is inserted and fixed by adhesive, the sleeve 3 having a knob portion 31 located at the most proximal end side and held by hand, a male screw groove 32 that is threaded only in a predetermined range on the outer surface adjacent to the knob portion 31 and screws into the female screw groove 22a, and an abutment portion 33 located at the most distal end side and abutting against the inner surface of the circular hole 22. This sleeve system S has such a configuration, and therefore can provide a golf club 1 that is strong and does not impair the hitting feeling. This is because only the base portion (upper portion; the side close to the grip) inside the circular hole 22 is fixed to the sleeve 3 on the shaft 4 side.

[0036] In other words, by using the sleeve system S of this embodiment, the combination of the head 2 and the shaft 4 can be changed, so that the storage space for the head 2 and the shaft 4 can be saved in the fitting shop. Furthermore, by processing the test club that is already owned, the test club can be utilized without being wasted. In addition, it is possible to provide a golf club 1 that is stronger than the conventional one and does not impair the hitting feeling.

[0037] In addition, the following effects are achieved: · Weight does not change: For example, if the weight of sleeve 3 is 5g, the weight after machining is also the same 5g, so there is no change in weight. Simply turn to attach and detach: No tools are required, so it can be easily attached and detached anywhere. - Future shaft cost reduction: Shafts currently in use can now be used with a variety of heads. This allows for a wider range of fittings and a wider selection of test clubs. - Strict cost control: Sleeve 3 is manufactured with cost as the top priority.

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

[0039] (3) Furthermore, the drilling depth of the circular hole 22 is adjusted so that the weight of the shavings and the weight of the sleeve 3 are approximately the same, so that the weight can be easily adjusted and there is no difference in the feel when using it.

[0040] (4) The fitting method of this embodiment is a fitting method that uses the sleeve system S as described above, and includes the steps of adhesively fixing the sleeve 3 to the tip of the shaft 4, fixing the head 2 using a fixing jig, drilling a circular hole 22 in the head 2, screwing the female screw groove 22a while keeping the head 2 fixed using the fixing jig, and screwing the sleeve 3 and the head 2 together. Since this fitting method includes these steps, it is possible to provide a golf club 1 that is strong and does not impair the feel of the impact. And fitting can be performed using the golf club 1 that is strong and does not impair the feel of the impact.

[0041] Among these, the process of drilling the circular hole includes a process of adjusting the drilling depth so that the weight of the shavings generated when drilling the circular hole and the weight of the sleeve 3 are approximately the same, so that the weight can be easily adjusted and there is no difference in the feel when using it.

[0042] Although an embodiment of the present invention has been described in detail above with reference to the drawings, 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 symbols]

[0043] S Sleeve System 1. Golf clubs 2 Head 20 Main body 20a Face 21 Hosel 22 circular hole 22a Female thread groove 22b Contact surface 22c bottom 3 Sleeve 30 Through hole 31 Knob 32 Male thread groove 33 Contact part 4 Shaft

Claims

1. In a sleeve system for a golf club; A head made of soft iron or stainless steel, in which a circular hole is drilled along a central axis determined based on the outer shape of a hosel, and which has a left-handed female screw groove that is threaded only in a predetermined range on the inlet side of the inner surface of the circular hole; a cylindrical sleeve into which a tip of a shaft is inserted and adhesively fixed, the sleeve being made of an alloy and integrally including a knob located at the most proximal end side to be held by hand, a left-handed male screw groove that is threaded only in a predetermined range of the outer surface adjacent to the knob and that screws into the female screw groove, and an abutment located at the most distal end side to abut against the inner surface of the circular hole; A sleeve system, wherein the female thread groove formed on the inner surface of the circular hole of the head and the male thread groove formed on the outer surface of the sleeve are left-handed threads that screw into each other.

2. The sleeve system according to claim 1 , wherein the drilling depth of the circular hole is adjusted so that a weight of the shavings and a weight of the sleeve are approximately equal to each other.

3. A fitting method using the sleeve system of claim 2, 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; cutting the female screw groove while the head is fixed using the fixing jig; threading the sleeve and the head together; The fitting method comprises:

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