GB2166960A - A racket, such as a badminton racket - Google Patents

A racket, such as a badminton racket Download PDF

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Publication number
GB2166960A
GB2166960A GB08527738A GB8527738A GB2166960A GB 2166960 A GB2166960 A GB 2166960A GB 08527738 A GB08527738 A GB 08527738A GB 8527738 A GB8527738 A GB 8527738A GB 2166960 A GB2166960 A GB 2166960A
Authority
GB
United Kingdom
Prior art keywords
grip
shaft
racket
end section
rigidity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08527738A
Other versions
GB2166960B (en
GB8527738D0 (en
Inventor
Tetsuyuki Awano
Takashi Fujita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Gakki Co Ltd
Original Assignee
Nippon Gakki Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Gakki Co Ltd filed Critical Nippon Gakki Co Ltd
Publication of GB8527738D0 publication Critical patent/GB8527738D0/en
Publication of GB2166960A publication Critical patent/GB2166960A/en
Application granted granted Critical
Publication of GB2166960B publication Critical patent/GB2166960B/en
Expired legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B49/00—Stringed rackets, e.g. for tennis
    • A63B49/02—Frames
    • A63B49/08—Frames with special construction of the handle
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/06—Handles
    • A63B60/22—Adjustable handles
    • A63B60/26—Adjustable handles with adjustable stiffness
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B2209/00—Characteristics of used materials
    • A63B2209/02—Characteristics of used materials with reinforcing fibres, e.g. carbon, polyamide fibres
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/06—Handles
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/06—Handles
    • A63B60/08—Handles characterised by the material
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/06—Handles
    • A63B60/10—Handles with means for indicating correct holding positions

Abstract

A racket, such as a badminton racket, includes a grip 4 having a rigidity gradient which enables energy accumulation in order to provide strong hitting force. The grip 4 has a flared tube 3a or a funnel-like part 5 which increases in diameter towards the rear end of the grip 4, said flared tube or funnel being covered by a foamed plastics material 41 covered by an outer cover 42 and causing the rigidity of the grip to increase towards the rear end of the grip 4. <IMAGE>

Description

SPECIFICATION A racket, such as a badminton racket The present invention relates to a racket, such as a badminton racket, and more particularly relates to an improvement in the grip construction of a racket.
A badminton racket is in general comprised of an oval frame holding strings in tension and a shaft connected to the frame via a neck. The shaft takes the form of an elongate tube or rod made of fibre reinforced plastics (FRP) or metal, such as aluminium. The free end of the shaft is provided with a grip usually made of wood. An axial hole is made in the grip in order to accommodate a mass for weight adjustment.
In this conventional construction, the diameter of the shaft is much smaller than that of the wooden grip and rigidity of the wooden grip is very large.
Such an unbalanced combination causes excessive resistance to bending (rigidity) of the grip which impairs the accumuiation of elastic energy in the grip when hitting shuttles, i.e. flection of the grip.
Thus, the force applied to the shuttles is derived from elastic energy of the shaft only.
According to the present invention there is provided a racket comprising an oval frame holding strings in tension, a shaft coupled to the frame via a neck and a grip covering the free end section of the shaft, in which the rigidity distribution in the grip including the end section of the shaft covered thereby has a gradient gradually rising toward the outer end of the grip.
Some embodiments of the present invention will now be described, by way of examples, with reference to the accompanying drawings, in which: Figure lisa plan view of a badminton racket to which the present invention is applied; Figure 2 is a side view, partly in section, of one embodiment of the badminton racket in accordance with the present invention; and Figure 3 is a side view, partly in section, of anothei embodiment of the badminton racket in accordance with the present invention.
Referring to Figure 1, a badminton racket includes an oval frame 1 holding strings in tension, such strings may be formed of gut, a shaft 3 connected to the frame 1 via a neck 2 and a hand grip 4 covering the free end section of the shaft 3. The shaft 3 takes the form of a thin, elongated tube made of FRP such as carbon fibre reinforced plastics or metal, such as aluminium.
As remarked above, the present invention is directed to the grip construction of such a badminton racket.
In the embodiment shown in Figure 2, the shaft 3 terminates at the grip end 4a of the grip 4. More specifically the end section 3a of the shaft 3 gradually diverges towards the grip end 4a. The grig 4 is made up of an inner sheath 41 directly covering the end section 3a of the shaft 3, an outer sheath 42 covering the inner sheath 41 and an end cap 43 attached to the free end of the grip 4 while closing the mouth at the end section of the shaft 3. The inner sheath 41 is made of foam polyurethane resin in order to reduce rigidity of the grip nose portion 4b.
The outer sheath 42 is usually made of leather. The end cap 43 may be formed in one piece with the inner sheath 41 during moulding of the latter, and may be also covered by the outer shell 42. In one typical example, the largest diameter of the end section 3a of the shaft 3 is 15 mm when the standard outer diameter of the shaft 3 is 7.6 mm.
The bore in the end section 3a of the shaft 3 may be either left blank or filled with foam resin.
The divergent construction of the end section 3a of the shaft 3 produces rigidity distribution with a gradient gradually rising towards the grip end.
In the embodiment shown in Figure 3, the end section 3a of the shaft 3 terminates at a position just past the grip nose portion 4b and a funnel-like reinforcement 5 follows next, which diverges towards the grip end 4a.
In an alternative, one or more FRP reinforcements may be embedded in either the inner or outer sheath in a manner such that rigidity distribution should have a gradient gradually rising towards the grip end.
In a further embodiment, density of the foam resin used for the inner sheath 41 may be adjusted along the axis of the grip 4 so that rigidity distribution should have a gradient gradually rising towards the grip end.
It will be appreciated that the invention can be applied to a tennis racket or a squash racket.
1. A racket comprising an oval frame holding strings in tension, a shaft coupled to the frame via a neck and a grip covering the free end section of the shaft, in which the rigidity distribution in the grip including the end section of the shaft covered thereby has a gradient gradually rising toward the outer end of the grip.
2. A racket as claimed in claim 1, in which the grip includes an inner sheath directly covering the end section of the shaft and made of foam synthetic resin.
3. A racket as claimed in claim 1 or claim 2, in which the end section of the shaft diverges towards and terminates at the outer end of the grip.
4. A racket as claimed in claim 1 or claim 2, in which the end section of the shaft terminates at a position just past the nose portion of the grip and is continued by a funnel-like reinforcement which diverges towards the outer end of the grip.
5. A racket as claimed in claim 2 or claims 3 or 4 when dependent upon claim 2, in which the inner sheath is provided with one or more reinforcement in such a manner that its rigidity gradually increases towards the outer end of the grip.
6. A racket as claimed in claim 2 or ciaims 3 or 4
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A racket, such as a badminton racket The present invention relates to a racket, such as a badminton racket, and more particularly relates to an improvement in the grip construction of a racket. A badminton racket is in general comprised of an oval frame holding strings in tension and a shaft connected to the frame via a neck. The shaft takes the form of an elongate tube or rod made of fibre reinforced plastics (FRP) or metal, such as aluminium. The free end of the shaft is provided with a grip usually made of wood. An axial hole is made in the grip in order to accommodate a mass for weight adjustment. In this conventional construction, the diameter of the shaft is much smaller than that of the wooden grip and rigidity of the wooden grip is very large. Such an unbalanced combination causes excessive resistance to bending (rigidity) of the grip which impairs the accumuiation of elastic energy in the grip when hitting shuttles, i.e. flection of the grip. Thus, the force applied to the shuttles is derived from elastic energy of the shaft only. According to the present invention there is provided a racket comprising an oval frame holding strings in tension, a shaft coupled to the frame via a neck and a grip covering the free end section of the shaft, in which the rigidity distribution in the grip including the end section of the shaft covered thereby has a gradient gradually rising toward the outer end of the grip. Some embodiments of the present invention will now be described, by way of examples, with reference to the accompanying drawings, in which: Figure lisa plan view of a badminton racket to which the present invention is applied; Figure 2 is a side view, partly in section, of one embodiment of the badminton racket in accordance with the present invention; and Figure 3 is a side view, partly in section, of anothei embodiment of the badminton racket in accordance with the present invention. Referring to Figure 1, a badminton racket includes an oval frame 1 holding strings in tension, such strings may be formed of gut, a shaft 3 connected to the frame 1 via a neck 2 and a hand grip 4 covering the free end section of the shaft 3. The shaft 3 takes the form of a thin, elongated tube made of FRP such as carbon fibre reinforced plastics or metal, such as aluminium. As remarked above, the present invention is directed to the grip construction of such a badminton racket. In the embodiment shown in Figure 2, the shaft 3 terminates at the grip end 4a of the grip 4. More specifically the end section 3a of the shaft 3 gradually diverges towards the grip end 4a. The grig 4 is made up of an inner sheath 41 directly covering the end section 3a of the shaft 3, an outer sheath 42 covering the inner sheath 41 and an end cap 43 attached to the free end of the grip 4 while closing the mouth at the end section of the shaft 3. The inner sheath 41 is made of foam polyurethane resin in order to reduce rigidity of the grip nose portion 4b. The outer sheath 42 is usually made of leather. The end cap 43 may be formed in one piece with the inner sheath 41 during moulding of the latter, and may be also covered by the outer shell 42. In one typical example, the largest diameter of the end section 3a of the shaft 3 is 15 mm when the standard outer diameter of the shaft 3 is 7.6 mm. The bore in the end section 3a of the shaft 3 may be either left blank or filled with foam resin. The divergent construction of the end section 3a of the shaft 3 produces rigidity distribution with a gradient gradually rising towards the grip end. In the embodiment shown in Figure 3, the end section 3a of the shaft 3 terminates at a position just past the grip nose portion 4b and a funnel-like reinforcement 5 follows next, which diverges towards the grip end 4a. In an alternative, one or more FRP reinforcements may be embedded in either the inner or outer sheath in a manner such that rigidity distribution should have a gradient gradually rising towards the grip end. In a further embodiment, density of the foam resin used for the inner sheath 41 may be adjusted along the axis of the grip 4 so that rigidity distribution should have a gradient gradually rising towards the grip end. It will be appreciated that the invention can be applied to a tennis racket or a squash racket. CLAIMS
1. A racket comprising an oval frame holding strings in tension, a shaft coupled to the frame via a neck and a grip covering the free end section of the shaft, in which the rigidity distribution in the grip including the end section of the shaft covered thereby has a gradient gradually rising toward the outer end of the grip.
2. A racket as claimed in claim 1, in which the grip includes an inner sheath directly covering the end section of the shaft and made of foam synthetic resin.
3. A racket as claimed in claim 1 or claim 2, in which the end section of the shaft diverges towards and terminates at the outer end of the grip.
4. A racket as claimed in claim 1 or claim 2, in which the end section of the shaft terminates at a position just past the nose portion of the grip and is continued by a funnel-like reinforcement which diverges towards the outer end of the grip.
5. A racket as claimed in claim 2 or claims 3 or 4 when dependent upon claim 2, in which the inner sheath is provided with one or more reinforcement in such a manner that its rigidity gradually increases towards the outer end of the grip.
6. A racket as claimed in claim 2 or ciaims 3 or 4 when dependent upon claim 2, In which the density of the foam synthetic resin gradually Increases towards the outer end of the grip.
7. A racket substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
GB08527738A 1984-11-16 1985-11-11 A racket, such as a badminton racket Expired GB2166960B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1984174064U JPH0136532Y2 (en) 1984-11-16 1984-11-16

Publications (3)

Publication Number Publication Date
GB8527738D0 GB8527738D0 (en) 1985-12-18
GB2166960A true GB2166960A (en) 1986-05-21
GB2166960B GB2166960B (en) 1988-05-18

Family

ID=15971989

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08527738A Expired GB2166960B (en) 1984-11-16 1985-11-11 A racket, such as a badminton racket

Country Status (2)

Country Link
JP (1) JPH0136532Y2 (en)
GB (1) GB2166960B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2186492A (en) * 1986-01-22 1987-08-19 Nippon Musical Instruments Mfg A badminton racket shaft and grip assembly
GB2192550A (en) * 1986-07-14 1988-01-20 William Colman Michael Brett Grips for handles of sporting equipment
US5092594A (en) * 1991-02-21 1992-03-03 Yea Tay Enterprise Co., Ltd. Shock absorbing structures of a game racket handle
EP0537913A1 (en) * 1991-10-15 1993-04-21 Tsai Chen Soong Handle for sports equipment shafts
GB2264650A (en) * 1992-02-25 1993-09-08 Arthur Hong Hand grip for racket

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2186492A (en) * 1986-01-22 1987-08-19 Nippon Musical Instruments Mfg A badminton racket shaft and grip assembly
GB2186492B (en) * 1986-01-22 1989-11-01 Nippon Musical Instruments Mfg A badminton racket shaft and grip assembly
GB2192550A (en) * 1986-07-14 1988-01-20 William Colman Michael Brett Grips for handles of sporting equipment
GB2192550B (en) * 1986-07-14 1989-12-13 William Colman Michael Brett Grips for the handles of sports equipment
US5092594A (en) * 1991-02-21 1992-03-03 Yea Tay Enterprise Co., Ltd. Shock absorbing structures of a game racket handle
EP0537913A1 (en) * 1991-10-15 1993-04-21 Tsai Chen Soong Handle for sports equipment shafts
GB2264650A (en) * 1992-02-25 1993-09-08 Arthur Hong Hand grip for racket

Also Published As

Publication number Publication date
JPS6188761U (en) 1986-06-10
GB2166960B (en) 1988-05-18
GB8527738D0 (en) 1985-12-18
JPH0136532Y2 (en) 1989-11-07

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19951111