JPH0553668U - Racket having vibration absorbing means - Google Patents

Abstract

(57) [Summary] [PROBLEMS] The present invention is a shock absorber that increases the elastic length of a shaft to absorb a shock applied to the hand of a player having a racket with a larger impact force and to reduce a reaction force. Relating to a racket having. [Structure] A head portion, a net surface, a shaft, a hand grip, and an elastic vibration absorber installed at a front end portion of the hand grip, wherein the elastic vibration absorber is installed at a front end portion of the hand grip. The fixed end portion of is extended to the handgrip.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a racket, and more particularly to a racket having a hand grip provided with an elastic shock absorber (hereinafter referred to as a vibration absorber).

[0002]

[Prior Art]

 As shown in FIG. 1, a conventional racket 10 includes a head portion 11, a shaft 13 of a predetermined length extending vertically downward from the bottom end of the head portion 11, and a hand grip 14 firmly fixed to the shaft 13. Composed. A tapered sleeve 15 formed of a hard plastic material is attached to the front end of the handgrip 14 and has a hole in its tapered end for receiving the shaft 13. Since the handgrip 14 and sleeve 15 are attached to form the body, the actual elastic length L of the shaft 13 is from the tapered end of the sleeve 15 to the bottom end of the head 11. In the case of a head portion, a shaft, and a hand grip that have the same shape and material, the impact force of the racket depends on the elastic length L of the shaft 13. In other words, a shaft with a larger elastic length L 1 hits the ball with a greater force, resulting in a greater reaction force on the hand holding the racket. It is well known that rackets with excessively long shafts considerably impede the ball striking action of the player. Therefore, the player needs to select an optimum racket in consideration of his / her appearance and height.

[0003]

[Problems to be solved by the device]

 Therefore, an object of the present invention is to provide a racket of a conventional size provided with a shaft having a larger elastic length L capable of enhancing the hitting force and relaxing the reaction force.

[0004]

[Means for Solving the Problems]

 A racket according to the present invention for solving the above-mentioned problems includes an elastic vibration absorber installed in a sleeve attached to a handgrip, and the racket can provide a greater hitting force. It is intended to achieve the dual purpose of effectively increasing the elastic length of the shaft, absorbing shocks and reducing the reaction force exerted on the player holding the racket. The vibration absorbing means is characterized in that the fixed end of the shaft extends to the handgrip. It is preferable that this vibration absorber has a tapered structure having an axial hole set at the center for receiving the shaft. It is preferable that the vibration absorber includes a predetermined number of ribs formed of foamed PU material and extending to the hand grip, and the hand grip surrounds the rib and the shaft. It is preferable that the vibration absorber has a predetermined number of hollow portions formed of a foamed PU material and extending to the hand grip. The vibration absorber is mounted with a tapered sleeve having two concave portions at positions corresponding to front and rear sides of the net surface along the direction of the shaft, and the concave portion further has two shoulders and the tapered portion. The sleeve may be fixed to the handgrip at its bottom end. The above objects, features, and operations of the present invention will be described in detail below with reference to the drawings by the preferred embodiments.

[0005]

【Example】

 2 and 3, the preferred embodiment racket 20 of the present invention comprises a head portion 21, a net surface 22, a shaft 23, and a handgrip 24. The racket 20 of the present invention differs from the racket of the prior art in that the racket 20 of the present invention includes an elastic vibration absorber 25 installed at the front end of the handgrip 24. The tapered elastic vibration absorber 25 is formed of polyethylene rubber and has a shaft hole centered to receive the shaft 23 rigidly connected to the handgrip 24.

The vibration absorber 25 is very elastic and is not fixed to the end of the shaft 23. In fact, the end of the shaft 23 extends into the handgrip 24, as is apparent from FIG. As a result, the elastic length of the shaft 23 includes the length h of the vibration absorber 25 in addition to the elastic length L of the shaft 23. In other words, the racket 20 of the present invention has an elastic length of L + h, which effectively improves the hitting force of the racket 20. Further, the shock wave transmitted from the head portion 21 is effectively absorbed by the vibration absorber 25 before reaching the hand grip 24. As a result, the hand of the player holding the hand grip 24 is not damaged.

Referring to FIGS. 4 and 5, a racket 30, which is a second preferred embodiment of the present invention, includes a head portion 31, a net surface 32, a shaft 33, and a hand grip 34. The racket 30 of the second aspect is basically the same as the racket 20 of the first aspect, except that the racket 30 has a vibration absorber 35 fitted therein by a tapered sleeve 36. The sleeve 36 is made of a hard plastic material and is composed of two recesses 360 which are set at positions corresponding to the front and rear sides of the net surface 32 along the shaft 33 direction. As indicated by the dotted line in FIG. 5, the recess is intended to oscillate the shaft 33 in a direction perpendicular to the net surface 32. The bottom end of the sleeve 36 is fixed to the front end of the handgrip 34. The recess 360 of the sleeve 36 is intended to limit elastic vibration of the shaft 33 in a direction parallel to the net surface 32. As a result, as shown in FIG. 4, the total elastic length of the shaft 33 is L + h. In other words, the racket 30 of the present invention includes means for preventing the shaft 33 from vibrating in the direction parallel to the net surface 32 so that the proper rigidity of the shaft 33 is maintained.

A third preferred embodiment of the present invention has an improved design PU foam handgrip 43, as shown in FIG. The vibration absorber 42 is installed at a predetermined position on the shaft 41. The tapered vibration absorber 42 has a shaft hole 420 at a central position for receiving the shaft 41. The bottom of the vibration absorber 42 extends downward and forms an insertion portion 421 having a predetermined number of ribs 422 extending downward. The shaft 41 fitted into the vibration absorber 42 is installed in a molding cavity (not shown) for injecting the foamed PU by heating and pressurizing. After cooling, the PU foam handgrip 43 is removed from the molding cavity. In this way, the vibration absorber 42 is firmly fixed to the front end portion of the handgrip 43 by the insertion portion 421 and the rib 422 acting as an anchor.

As is apparent from FIG. 7, the fourth preferred embodiment of the present invention is a modification of the above embodiment. The vibration absorber 52 does not have a rib and is composed of a predetermined number of hollow portions 521 set on the bottom thereof. It is intended that the PU material be allowed to enter the cavity 521 when the foamed PU material is injected into the molding cavity to form the handgrip 53.

[Brief description of drawings]

FIG. 1 is a schematic view of a racket according to the prior art.

FIG. 2 is a plan view of a racket according to the first preferred embodiment of the present invention.

FIG. 3 is a sectional view of a portion taken along the line AA of FIG.

FIG. 4 is a plan view of a racket according to a second preferred embodiment of the present invention.

5 is a sectional view of a portion taken along the line BB of FIG.

FIG. 6 is a sectional view of a racket according to a third preferred embodiment of the present invention.

FIG. 7 is a sectional view of a racket according to a fourth preferred embodiment of the present invention.

[Explanation of symbols]

 20, 30 ... Racket 21, 31 ... Head part 22, 32 ... Net surface 23, 33 ... Shaft 24, 34 ... Hand grip 25, 35 ... Vibration absorber 36 ... Sleeve 360 ... Recess 361 ... Shoulder

Claims (5)

[Scope of utility model registration request] 1. A head portion, a net portion, a shaft, a hand grip, and an elastic vibration absorber installed at a front end portion of the hand grip, wherein a fixed end portion of the shaft extends to the hand grip. A racket having a vibration absorbing means. 2. The racket according to claim 1, wherein the vibration absorber has a tapered structure having a central axial hole for receiving the shaft. 3. The racket according to claim 2, wherein the vibration absorber has a predetermined number of ribs formed of a foamed PU material and extending to the hand grip, and the hand grip surrounds the rib and the shaft. 4. The vibration absorber has a predetermined number of cavities formed of foamed PU material and extending to the hand grip.
The racket according to claim 2. 5. The vibration absorber is mounted together with a tapered sleeve having two concave portions at positions corresponding to front and rear sides of the net surface along a direction of the shaft, and the concave portion further has two shoulders. The racket according to claim 1, wherein the tapered sleeve is fixed to the handgrip at its bottom end.