JPH0737645Y2 - Exercise racket frame - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a tennis racket, a racket ball racket, a squash racket, and a badminton racket, especially of a kind of fiber reinforced that can minimize the impact on the user's hand when hitting. The present invention relates to a racket manufactured by using a composite material as a main material.

[0002]

2. Description of the Related Art Generally, a racket mainly composed of a fiber reinforced composite material has a fiber reinforced plastic (FRP) as its outer layer shell, and the outer layer shell is made by heating a woven fabric of several long fibers at the time of manufacture. After winding a woven plate impregnated with curable resin into a racket shape, put it in a mold and pressurize, heat cure,
It is molded. Generally speaking, the multilayer structure described above extends substantially uniformly along the entire racket. In other words, the head and handle of a conventional fiber reinforced plastic racket of this type have generally similar cut surfaces. From the viewpoint of vibration, such a uniform monolithic multilayer structure is extremely convenient for complete transmission of vibration waves.

Therefore, the vibration generated when the ball is hit by the face of the above-mentioned multi-layered racket is transmitted to the user's hand directly from the head through the handle (grip) without being blocked. Phenomena give considerable damage to the user's hands.

In order to solve this problem, many patent proposals have been submitted, among which Taiwan Utility Model Registration No. 782019
No. 97 "Racket structure that eliminates vibration of grip" is to insert one unidirectional opening handle into the end of the main shaft of the racket head, and install one vibration absorbing body between the two, or install one at the end of the main shaft and the bottom of the handle. It is disclosed to attach two springs. Such a structure is complicated and difficult to manufacture, and since vibration waves are absorbed after being transmitted to the handle portion, the effect of blocking and reducing vibration is not so remarkable.

In Taiwan Utility Model Registration No. 75210508, "Movement racket having a sponge damping device", a high elasticity sponge is attached to the gut of the ball striking face to eliminate vibration of the ball striking face (face). The structure only eliminates the vibration of the ball striking face, and has no effect on the elimination of the vibration of the racket frame.

[0006] Taiwan Utility Model Registration No. 78210299 "Structure of racket which prevents hitting ball vibration force" has a plurality of concave grooves on the racket handle, and one vibration absorbing ring is attached on the concave groove when hitting a ball. However, in reality, this kind of structure can absorb only a small amount of vibration waves on the racket frame surface, and effectively blocks or eliminates the vibration waves transmitted from the racket frame head to the grip after the ball is hit. It is not possible.

Further, Taiwan Utility Model Registration No. 78211558 "improvement of hitting ball vibration damping structure" also solves the vibration problem after hitting the conventional racket frame, which is characterized by being integrally molded on the inner edge of the racket head peripheral surface. It also has a plurality of concave grooves, and one damping rod is attached in each concave groove. This kind of structure only partially eliminates the vibration generated through the chord line of the vibration damping rod, and generally has no effect of blocking or eliminating the vibration transmitted from the racket head to the grip portion. Also, in this structure, it is extremely difficult to attach the chord wire.

[0008] In short, until now, it seems that there is still no method for effectively preventing or eliminating the vibration wave transmitted from the racket head to the grip in the racket having the fiber reinforced plastic as the outer layer.

[0009]

[Problems to be solved by the invention] The main purpose of the invention is to
(EN) A racket frame having a multilayer structure made of a kind of fiber-reinforced composite material as an outer layer thereof, which can effectively and surely eliminate vibration shock received by a user's hand at the time of hitting a ball.

Another object of the present invention is to provide a racket frame made of a kind of fiber reinforced plastic, which is capable of blocking or eliminating vibration waves directly transmitted from the racket face to the user's hand when hitting. Is. Yet another object of the present invention is to provide a racket frame capable of absorbing a vibration wave transmitted from the racket face to the user's hand when hitting a kind of ball.

[0011]

[Means for Solving the Problems]
If the racket frame provided by the user's needs,
Its hardness and elasticity can be adjusted during the manufacturing process.

In the racket frame according to the present invention, one head portion forms a ball striking face, and one handle portion is connected to one end of the head portion. In this frame,
It has an outer layer made of precast long fibers impregnated with one or more thermosetting resins, the feature of which is the cutting of young fibers from the handle of this outer shell to a certain length part of the head end. Is provided, and the number of cut fibers in each fiber cut portion is constant with the total number of the partial fibers in the outer layer. Since the position of the grip where the user grips the racket is usually at the end of the handle portion, the reinforcing fibers between the handle portion and the grip portion are discontinuous due to the fiber cutting portion. Such a discontinuous state interrupts the transmission of vibration waves, that is, a large amount of vibration waves generated when the racket hits the ball is cut off at this cutting portion, and the impact of the user's ball hitting is effective. It will be reduced. As is clear from the above, the number of fibers cut in the fiber cutting portion of the racket frame of the present invention is not all the fibers of the outer shell of the portion, and the number of cut fibers can be adjusted as necessary. For example,
When it is relatively strong and requires a counterattack force, the ratio of the number of cut fibers is decreased, and conversely, the racket used by a novice, a woman or a child appropriately increases the ratio of cut fibers. A suitable ratio range is 5 to 95%.

Another feature of the racket frame of the present invention is that the outer shell has one covering layer on the fiber cut portion to reinforce the portion and absorb residual vibration waves. is there. For manufacturing, this coating layer is made of a polymer or a fiber reinforced plastic material.

One feature of the racket frame of the present invention is that it has some embeddings on the fiber cuts in its outer shell, which embeddings include metal, wood elastic plastics, fiber reinforced plastics or ceramics. It is made of the above material, and goes one step further to absorb the vibration wave coming from the ball striking face and to reinforce the strength of the part.

Yet another feature of the racket frame of the present invention is that a groove is provided on the fiber cut portion of the outer shell over the fiber cut portion, and each of the above-mentioned embeddings is housed in these grooves. It is to ensure that each implant is localized.

Other objects and features of the present invention can be further understood by explaining the following preferred embodiments.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a racket frame (10) of the present invention has a handle (14) connected to one end of a ring-shaped head (12).
The end of is the grip part (16).

When the gut (20) is stretched on the head (12), a ball striking face (22) is formed. The handle (14) has two arms (141) and (142) extending from one end of the head (12), a joint (143) at the end of each arm (141) and (142), and a grip (connected to this joint). 16) consists of.

The racket frame (10) is formed by impregnating a large number of epoxy resins, and wrapping and winding carbon fiber plates having a fixed fiber direction, heating and pressing the outer shell (30).
And a foamed core (32) filled in the outer shell (30).

In the first preferred embodiment of the present invention, as shown in FIG. 2, the outer shell (30) is provided with a concave portion (34) having a constant depth from the joint portion (143) to the grip (16). The cross section of the entry part (34) is almost octagonal, and eight rectangular surfaces (3
6) (38) (40) (42) (44) (46) (48) (50) are formed. First, third, fifth and seventh rectangular surfaces (36) (40) (44) (4
8) Provide fiber cutting parts (52) that are perpendicular to the axis of the handle (14) and are not on the same plane. The total number of fiber cuts of each fiber cutting part (52) in this example is the same as the concave part (3
4) About 50% of the total fiber count. By doing so, the fibers of the recessed portion (34) of the outer shell (30) of the racket frame (10) are in a discontinuous state, and this discontinuous state is extremely effective for blocking and extinguishing the vibration wave. To demonstrate. In other words, the vibration wave generated when the hitting surface (22) hits the ball along the head (12) along with the handle (1
Although it is transmitted to the front of the grip (16) via 4), a large amount of vibration waves are blocked or disappeared when passing through the recessed portion (34), so that the user's hand can be protected from the impact at the time of hitting the ball. . Besides, since the racket frame (10) of the present embodiment has the coating layer (54) made of a high-molecular polymer formed in the recessed portion (34), it further absorbs the remaining vibration wave. , Fill in the recessed part (34) and grip (1
The space between 6) and the handle (14) is made flat and the strength of the portion (34) is reinforced.

FIG. 3 shows a second preferred embodiment of the present invention.
An annular recess (53) is formed at the joint between the handle (14) and the grip (16), and this annular recess (53) also has eight adjacent rectangular surfaces (55). Each of the first, third, fifth and seventh rectangular surfaces inside has one fiber cutting part (5
7) is provided, and at the same time, four embedding rods (56) made of metal, plastic or ceramics for fiber reinforcement are embedded, and then a coating layer (59) is molded, whereby an annular recess (53) is formed.
Increase the rigidity of. Of course, these embedded rods (56) can be made of wood or elastic plastic to enhance the elasticity and vibration absorption effect of each annular recess (53).

In the third preferred embodiment of the present invention, as shown in FIGS. 4 to 7, the outer shell (30) has an annular recess (60) at the joint between the joint (143) and the grip (16). ) Is provided and the cross section of this annular recess (60) is almost octagonal, so eight adjacent rectangular surfaces (62) (64) (66) (68) (70) (72) (7)
4) (76) is formed. On the first, third, fifth and seventh rectangular surfaces (62) (66) (70) (74) of these, there are grooves (7) parallel to the axis of the handle (14) and having a certain depth.
8) is provided, and each rectangular surface has cut wounds (80) of different lengths, and the total number of cut fibers of these cut scratches (80) is the total number of fibers in the annular recess (60). Of about 40%. Separately, two vibration-absorbing rods (8
2) is placed in the grooves (78) on the first and fifth rectangular surfaces (62) (70), and two reinforcing rods (84) made of fiber reinforced plastic are used for the third and fourth rectangular surfaces. Put it in the groove (78) provided in (66) and (74). Finally, the outer layer shell (30) is put into one mold, and a mixed melt of short fibers and epoxy is injection-molded on the annular recess (60) to form one coating layer (86).

By doing so, 40% of the fibers of the outer shell (30) of the racket frame (10) are cut at the tip of the grip (16), so that the racket surface (22) is hit at the time of hitting. Most of the generated vibration waves are blocked before being transmitted from the head (12) to the grip (16), and the remaining vibration waves are absorbed by the vibration absorbing rod (84) and the coating layer (86), and the The impact received by the hand is surely smaller than in the case of the conventional racket. Further, since the racket frame (10) has the two reinforcing rods (82) embedded in the annular recess (60), it has appropriate hardness (toughness) and can exert a hitting force.

[0024]

EFFECTS OF THE INVENTION The present invention suppresses or eliminates the vibration transmitted to the hand when hitting a ball, and imparts appropriate elasticity and toughness to the racket.

[Brief description of drawings]

FIG. 1 is a three-dimensional view of the racket frame of the present invention.

FIG. 2 is a partial perspective view of the first preferred embodiment of the present invention.

FIG. 3 is a sectional view of a second preferred embodiment of the present invention.

FIG. 4 is a partial perspective view of a third preferred embodiment of the present invention.

FIG. 5 is a partially exploded view of the third preferred embodiment of the present invention.

6 is a sectional view taken along line 6-6 in FIG.

7 is a sectional view taken along line 7-7 in FIG.

[Explanation of symbols]

 10… Racket frame 12… Head part 14… Handle part 16… Grip part 20… Gut 30… Outer shell 32… Foam core 36, 38, 40, 42, 44, 46, 48, 50… Rectangular surface 52… Fiber cutting Part 54 ... Covering layer 62, 64, 66, 68, 70, 72, 74, 76 ... Rectangular surface 78 ... Groove 80 ... Cutting scratch 84 ... Reinforcing rod

Claims (9)

[Scope of utility model registration request] 1. An exercise racket frame comprising a head portion forming a ball striking face, a throat portion extending outward from the head portion, and an outer shell formed by many long fiberboards pre-impregnated with a thermosetting resin. The outer shell further comprises a fiber cut located at a predetermined portion of the handle portion, and the total number of fibers in the fiber cut is greater than that of the portion of the outer shell from which the fiber cut is constructed. A racket frame for exercise, characterized in that it is 5 to 95% of the total number of fibers, and that the portion of the outer shell in which the fiber cuts are located is wrapped by a covering layer made of a predetermined material. . 2. The exercise racket frame according to claim 1, wherein the fiber cut portion of the outer layer shell is recessed in the surface of the outer layer shell at a constant depth. 3. The exercise racket frame according to claim 1, wherein the embedding made of a reinforcing or vibration absorbing material is embedded in advance on the fiber cut portion of the outer shell before the covering layer is formed. 4. The exercise racket frame according to claim 3, wherein a certain number of grooves having a constant distance are provided on the fiber cut portion of the outer layer shell, and each embedment is embedded in each groove. 5. The exercise racket frame of claim 1, wherein the cover layer is made of a polymeric material. 6. The exercise racket frame of claim 3, wherein the implant is made of a resilient plastic material. 7. The embedded material is fiber reinforced plastic (FR).
The exercise racket frame according to claim 3, which is made of P) material. 8. The exercise racket frame of claim 3, wherein the implant is made of a metallic material. 9. The exercise racket frame of claim 3, wherein the implant is made of a wood material.