JPH0570560U - Racket grip improvement structure - Google Patents

Abstract

(57) [Abstract] [Purpose] Light weight, uniform density, accurate center line,
(EN) A grip structure in which the joint portion with a shaft is also strong and the racket does not tear from that portion. [Structure] The outer shape of the grip has a uniform density,
A grip part (22) made of a light material, and a hollow column-shaped reinforcing part (21) in the center part of the grip part (22) in order to increase the structural strength of the grip part (22). The grip part (22) is arranged and embedded so that the axis of the central part of the grip part (22) and the axis of the central part of the reinforcing part (21) are aligned, and the reinforcing part (21) is embedded in the shaft (3) of the racket.
0) insertion hole for the racket shaft (30)
A grip structure for a racket that is configured to be inserted into the insertion hole and adhesively fixed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a racket, and more particularly to a structure for improving the grip of the racket.

[0002]

[Prior Art]

 As can be seen from the prior art, about 80% of the racket's grip is still made from wood, then glued to the racket's shaft, only about 5% is a single piece of carbon fiber, the rest of which is polyurethane. (Polyurethane, PU) is foamed and injected to be integrally molded with the racket shaft.

As shown in FIG. 3, since the wooden grip can be manufactured independently, it has flexibility in terms of productivity and is widely adopted in the industry. However, its disadvantage is that the weight is heavy and the density of the wood is not completely uniform, so the density is changed due to the influence of the wood grain, so the weight distribution becomes uneven, and after being adhered to the racket shaft, The center line of the racket and the center line of the racket are misaligned, which affects the quality of the racket. In addition, since wood has fine cracks that cannot be visually or visually detected, cracks easily occur from the wood grain or cracks when used. In addition, the wood grip is first carved out on a wood lathe at the time of manufacture, and then a hole is provided at the end of the grip for inserting and adhering the racket shaft. However, when making a hole at the end, even if there is a small amount of misalignment, the center of the hole and the center of the grip will shift, and after it is assembled, the racket itself and the center line of the grip will also shift, which will affect the quality of the racket. It has a great influence.

As shown in FIG. 4, the all-carbon fiber racket has a good structure and does not have the drawbacks of the above-mentioned wood grip, but since the manufacturing cost is high, its market share is low and it can be widely used. Can not. Most of the carbon fiber rackets currently on the market have their frame and shaft molded from carbon fiber in one piece, and the grips are glued wood grips or injection molded polyurethane. If you wanted to make these rackets out of all-carbon fiber, you wouldn't be able to use all the jigs and molds you've been using, you'd have to make new jigs, and the cost of it would be very high. This is the main reason why the industry cannot fully disseminate all-carbon fiber rackets.

As shown in FIG. 5, if a polyurethane foam injection molding grip is adopted, it is of course possible to have the advantage of being light and having a uniform density distribution. However, in foam injection molding, the frame of the racket is molded in advance and then Since it has to be put into the mold and injection molded the grip, its production capacity cannot be mass-produced due to the limitation of mechanical equipment. In particular, racket production is affected by the time of the order and changes seasonally, and manufacturers cannot produce it in advance and wait for the order of the trading company, everything must be made according to the order after the trading company orders. .. However, the order is always concentrated in several months, and there is a phenomenon of rush delivery. As mentioned before, all rackets (tennis rackets or badminton rackets or squash rackets) have their frames and shafts completed and then put in an injection mold to eject the polyurethane grips, so the grips It is a completed part, and the polyurethane grip can be injection molded only after the frame and shaft are completed. Therefore, when a manufacturer mass-produces various types of rackets, unless a large amount of polyurethane injection molding equipment is invested, the racket cannot be produced in time, and a large number of rackets wait for the polyurethane injection grip. , Will affect production capacity. However, when a large amount of money is invested in the polyurethane injection molding facility, capital investment is wasted during periods of low production volume, which is why the current rackets still use wood grips. In other words, wooden grips can be produced independently, and if they are mass-produced in stock, they can be used even in the case of a large amount of orders.

[0006]

SUMMARY OF THE INVENTION A main object of the present invention is to provide an improved racket grip structure that can be manufactured independently and then adhesively fixed to the racket shaft to be pre-manufactured and stocked. Another object of the present invention is to provide a structure for improving racket grip which is light and has a uniform density distribution, has an accurate centerline, has good structural strength and is resistant to cracking.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the racket grip improvement structure provided by the present invention is made of a light material, and has a grip part having a uniform outer shape and a uniform density and a column-shaped reinforcement part. The reinforcing portion is provided with an insertion hole that is open at one end and is recessed inward along the central axis, and is embedded in the central portion of the grip portion. Further, in order to increase the structural strength of the grip portion, The central axis of the reinforcing portion coincides with the central axis of the grip and overlaps with each other, and the racket shaft is inserted and fixed in the insertion hole.

[0008]

【Example】

 In order to further understand the objects, features and functions of the present invention, examples will be described below with reference to the drawings. FIG. 1 is a sectional view of a racket grip 20 showing an embodiment of the present invention. FIG. 2 is a sectional view of the grip 20 according to the present invention assembled to a racket. As shown in FIGS. 1 and 2, the structure for improving the grip 20 of the racket of the present invention is such that a hollow cylindrical reinforcing portion 21 is made of an aluminum alloy, and the reinforcing portion 21 is put in an injection molding mold and made of polyurethane. Is foam-injected and integrally molded into a grip portion 22 having an outer mold of the grip, and a shaft hole 210 of the reinforcing portion 21 is formed as an insertion hole for inserting the shaft 30 of the racket. When the grip 20 and the shaft 30 are combined with each other, the shaft 30 of the racket may be directly inserted into the insertion hole 210 of the reinforcing portion 21 and the both may be adhesively fixed.

[0009]

[Effect of the device]

 The present invention has the following advantages. (1) It can be manufactured and produced independently and does not have the drawbacks of the all carbon fiber racket or polyurethane foam injection grips described above. In other words, it still retains the advantages of flexible production of wood grips. (2) It has a good structure, is light and uniform in density, has an accurate center line, and does not have the above-mentioned drawbacks of the wooden grip. In the present invention, a hollow aluminum tube is used as a joint reinforcing material, and the outside of the grip is formed with foamed polyurethane. Therefore, in addition to the advantages that the foamed polyurethane is light and has uniform density, the hollow aluminum tube has strong rigidity and expansion. Since it has ductility, if it is joined to the racket shaft, the strength of the joint will increase and the racket will not easily break from the joint.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a cross-sectional view after the present invention is assembled into a racket.

FIG. 3 is a cross-sectional view of a racket of a wooden grip that is commonly used.

FIG. 4 is a cross-sectional view of a commonly used all-carbon fiber racket.

FIG. 5 is a cross-sectional view of a racket of a commonly used polyurethane foam grip.

[Explanation of symbols]

 20 ... Racket grip 21 ... Reinforcement part 22 ... Grip part 30 ... Shaft 210 ... Insertion hole

Claims (4)

[Scope of utility model registration request] 1. A grip part (22) having an outer shape of a grip, having a uniform density and made of a light material, and a grip part (22) in a central part of the grip part (22).
In order to increase the structural strength of the
1) is arranged and embedded so that the axis of the central portion of the grip portion (22) and the axis of the central portion of the reinforcing portion (21) are aligned, and the reinforcing portion (21) is the shaft (30) of the racket. ) Of the racket shaft (3
The racket grip structure is characterized in that it is configured such that 0) is inserted into the insertion hole and adhesively fixed. 2. The reinforcing portion (21) has a hollow circular tubular shape,
The racket grip structure according to claim 1, wherein the shaft hole is formed in an insertion hole of the shaft (30). 3. The racket grip structure according to claim 1, wherein the reinforcing portion (21) is made of process plastic, aluminum or steel. 4. The racket grip structure according to claim 1, wherein the racket grip is integrally molded with the reinforcing portion (21) by polyurethane foam injection.