CA1137132A - Badminton racket - Google Patents
Badminton racketInfo
- Publication number
- CA1137132A CA1137132A CA000328284A CA328284A CA1137132A CA 1137132 A CA1137132 A CA 1137132A CA 000328284 A CA000328284 A CA 000328284A CA 328284 A CA328284 A CA 328284A CA 1137132 A CA1137132 A CA 1137132A
- Authority
- CA
- Canada
- Prior art keywords
- joint
- rib
- badminton racket
- shaped
- shaft
- 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.)
- Expired
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
- A63B49/03—Frames characterised by throat sections, i.e. sections or elements between the head and the shaft
- A63B49/032—T-shaped connection elements
Landscapes
- Health & Medical Sciences (AREA)
- Pulmonology (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Laminated Bodies (AREA)
Abstract
BADMINTON RACKET
Abstract of the Disclosure In a badminton racket having a substantially T-shaped tubular joint adapted to connect a shaft to a frame, the joint is provided with a pair of ribs integrally formed on opposite outer surfaces thereof. Each rib extends from the central part of this outer surface to respective free end por-tions of the T-shaped joint in such a manner that the rib is formed substantially in the shape of "T" with the thickness and width thereof gradually reducing toward the free end portions of the T-shaped joint.
Abstract of the Disclosure In a badminton racket having a substantially T-shaped tubular joint adapted to connect a shaft to a frame, the joint is provided with a pair of ribs integrally formed on opposite outer surfaces thereof. Each rib extends from the central part of this outer surface to respective free end por-tions of the T-shaped joint in such a manner that the rib is formed substantially in the shape of "T" with the thickness and width thereof gradually reducing toward the free end portions of the T-shaped joint.
Description
This invention relates to a badminton racket.
The badminton game generally involves a nimble and high-speed swing motion in batting a shuttlecock at a short interval in a relatively small court as compared with tennis.
A badminton racket should be so constructed as to meet such nimble and high-speed swing motions. To this end, it is requir-ed that the badminton racket has a light weight, a satisfactory resiliency, a sufficient mechanical strength and a minimum air resistance. However, it is very difficult to fulfil these requisites simultaneously since some of them are incompatible with each other. For example, a light weight, desirable resil-iency and minimum air resistance may all be provided simultan-eously in the badminton racket, but all of these features are responsible for a reduction of the mechanical strength thereof.
Unless a good balancing of the incompatible features can be provided, any other improvement in the structure of the badmin- ~-ton racket would be meaningless.
The present invention will be illustrated by way of the accompanying drawings in which:
Fig. l(a) is a front elevation of a conventional bad-minton racket, Fig~ l(b) is a sectional view taken along line A - A
in Fig. l(a), Fig. l(c) is a sectional view taken along line B - B
in Fig. l(a), Fig. 2(a~ is an enlarged front elevation of a T-shaped joint connecting a frame and a shaft of the badminton racket, Fig. 2(b) is a sectional view taken along line A - A
in Fig. 2(a), and Fig. 2(c) is a sectional view taken along line B - B
in Fig. 2(c).
, . ..
1~371;~2 Fig. 3 shows a badminton racket according to a first embodiment of the present invention wherein Fig. 3(a) is a front elevation of the badminton racket, Fig. 3(b) is a section-al view taken along line A - A in Fig. 3(a) and Fig. 3(c) is a sectional view taken along line B - B in Fig. 3(a), Fig. 4 mainly shows a T-shaped tubular joint of the badminton racket, wherein Fig. 4(a) is a front elevation of the badminton racket, Fig. 4(b) is a sectional view taken along line B - B in Fig. 4(a), and Fig. 4(c) is a sectional view taken along line B - B in Fig. 4(a), and Fig. 5 shows, in a front elevational view, a badminton racket according to a second embodiment of the present invention.
In an attempt to provide a badminton racket which fulfils the above all requisites as much as possible, there has been proposed to connect an oval-shaped frame to a shaft by a T-shaped joint. Reference is now made first to a conven-tional badminton racket shown in Figures 1 and 2.
.
71;~2 According to the conventinal badminton racket shown in Fig. 1 and Fig. 2, a shaft 1 and a frame 2 are made of light weight and rigid tubular material, such as stainless steel tubing, and are connected with each other by means of a tubular joint 3 as shown in Fig. l(a). The shaft 1 is construct-ed of a tubing of circular cross section as shown in Fig. l(b), while the frame 2 is of a tubing of irregularly rounded cross section having a major axis thereof in the swing directlon perpendicular to the racket's face as shown in Fig. l~c).
The tubular joint 3 is, as shown in Figs. 2(a) to
The badminton game generally involves a nimble and high-speed swing motion in batting a shuttlecock at a short interval in a relatively small court as compared with tennis.
A badminton racket should be so constructed as to meet such nimble and high-speed swing motions. To this end, it is requir-ed that the badminton racket has a light weight, a satisfactory resiliency, a sufficient mechanical strength and a minimum air resistance. However, it is very difficult to fulfil these requisites simultaneously since some of them are incompatible with each other. For example, a light weight, desirable resil-iency and minimum air resistance may all be provided simultan-eously in the badminton racket, but all of these features are responsible for a reduction of the mechanical strength thereof.
Unless a good balancing of the incompatible features can be provided, any other improvement in the structure of the badmin- ~-ton racket would be meaningless.
The present invention will be illustrated by way of the accompanying drawings in which:
Fig. l(a) is a front elevation of a conventional bad-minton racket, Fig~ l(b) is a sectional view taken along line A - A
in Fig. l(a), Fig. l(c) is a sectional view taken along line B - B
in Fig. l(a), Fig. 2(a~ is an enlarged front elevation of a T-shaped joint connecting a frame and a shaft of the badminton racket, Fig. 2(b) is a sectional view taken along line A - A
in Fig. 2(a), and Fig. 2(c) is a sectional view taken along line B - B
in Fig. 2(c).
, . ..
1~371;~2 Fig. 3 shows a badminton racket according to a first embodiment of the present invention wherein Fig. 3(a) is a front elevation of the badminton racket, Fig. 3(b) is a section-al view taken along line A - A in Fig. 3(a) and Fig. 3(c) is a sectional view taken along line B - B in Fig. 3(a), Fig. 4 mainly shows a T-shaped tubular joint of the badminton racket, wherein Fig. 4(a) is a front elevation of the badminton racket, Fig. 4(b) is a sectional view taken along line B - B in Fig. 4(a), and Fig. 4(c) is a sectional view taken along line B - B in Fig. 4(a), and Fig. 5 shows, in a front elevational view, a badminton racket according to a second embodiment of the present invention.
In an attempt to provide a badminton racket which fulfils the above all requisites as much as possible, there has been proposed to connect an oval-shaped frame to a shaft by a T-shaped joint. Reference is now made first to a conven-tional badminton racket shown in Figures 1 and 2.
.
71;~2 According to the conventinal badminton racket shown in Fig. 1 and Fig. 2, a shaft 1 and a frame 2 are made of light weight and rigid tubular material, such as stainless steel tubing, and are connected with each other by means of a tubular joint 3 as shown in Fig. l(a). The shaft 1 is construct-ed of a tubing of circular cross section as shown in Fig. l(b), while the frame 2 is of a tubing of irregularly rounded cross section having a major axis thereof in the swing directlon perpendicular to the racket's face as shown in Fig. l~c).
The tubular joint 3 is, as shown in Figs. 2(a) to
2(c), formed substantially in the shape of "T" and comprises horizontal arm portions 3(b) and 3(c) in which terminal ends 2(b) and 2(c) of the frame 2 are fixedly inserted and vertical portions 3(a) in which the upper end of the shaft 1 is fixedly inserted.
This conventional badminton racket is thus constructed with a view to achieving a high mechanical strength to meet a high-speed swing motions in addition to light-weight, a reduced air resistance and a satisfactory resiliency. However, in this badminton .:
11~'7132 racket, various impact loads arising from the use of the racket are structurely concentrated on the small T-shaped tubular joint 3. This means that the mechanical strength necessary for the badminton racket depends heavily upon the part of the T-shaped tubular joint 3. It becomes necessary, therefore, to enhance the mechanical strength inherent in the structure of the T-shaped tubular joint 3 in order to obtain a satisfactory mechanical strength of the racket frame as a whole as well as the other requi-site elements.
Now referring to the important factor of en-hancing the mechanical strength of the T-shaped tubular joint 3, the present inventor has learned that the mere pursuit of the mechanical strength of the tubular joint may create another serious problem.
The enhanced mechanical strength of the tubular joint 3 may involve the enlargement of dimensions which causes higher air resistance. More seriously, it has been learned that the shaft 1 and frame 2 will be more subjected to material fatigue in por-tions l(a), 2(b) and 2(c) adjacent to free end por-tions 3(a) 'o 3~c) of the T-shaped tubular joint 3.
That is, when the rigidity of the joint 3 is highly increased by enhancing the mechanical strength there-of, the joint cannot be bent or twisted in harmony -with the bending and twisting of the shaft 1 and frame 2. Accordingly, the bending and twisting 113~71;~2 stresses of the shaft and frame caused by high-speed swinging motion of the racket will be concentrated to the shaft and frame portions l(a), 2(b), 2(c~
adjacent to the free end portions 3(a~, 3(b), 3(c~
of the joint 3, respectively. This will result in breakages of the shaft and frame at these portions l(a~, 2(b~ and 2(c~.
From the reasons set forth above, although it is essentially important that the joint 3 has a suffi-cient mechanical strength, it cannot be too rigid.
Hitherto, it has been difficult to provide a T-shaped tubular joint having a sufficient mechanical strength as well as a desirable rigidity not to cause break-ages of the joint itself and also the shaft and frame portions adjacent to the free ends ofthe joint.
The present invention has been developed in view of the above problems. Therefore, an object of the present invention is to provide a badminton racket having an oval frame connected to a shaft by a T-shaped tubular joint, wherein the T-shaped tubu-lar joint has a sufficient mechanical strength as well as a desirable rigidity.
Another object of the present invention is to provide a badminton racket of the type set forth above, wherein a T-shaped tubular joint can be made lighter compared with the conventional one without decreasing the mechanical strength thereof.
A further object of the present invention is 113'713~
to provide a badminton racket of the type set forth above, wherein a T-shaped tubular joint can reduce an air resistance applied thereto when the badminton racket is swung at a high speed.
A badminton racket according to the present invention comprises a T-shaped tubular joint having fixedly inserted therein an upper end portion of a shaft and lower free end por-tions of an oval frame, wherein the tubular joint has a pair of ribs integrally formed on opposite outer surfaces thereof, each rib having a relatively wide area at the central part of this outer surface and extending from this central part to respective free end portions of the joint in such a manner that the rib is formed substantially in the shape of "T" with the thickness and width thereof gradually reducing toward the free end portions of the joint.
~13'~ Z
Referring once more to the accompanying drawings and in particular to a first embodiment of the present invention shown in Figs. 3 and 4, a shaft 4 and an oval frame 5 are joined together by means of a tubular joint 6 formed substantially in the shape of "T". the material of the shaft 4 may be, for example, metal tubing of stainless steel, etc. or FRP. The shaft 4 has a circular cross section as shown in Fig. 3(b). The lower portion of the shaft 4 is connected to a grip portion 7.
The frame 5 may he made of a metal tubing or fiber reinforced pipe. The frame 5 is of irregularly rounded cross section as shown in Fig. 3(c), wherein a width (rl) thereof in the swing direction perpendicular to the racket's face is larger than a width ~r2) meeting at right angles with the width (rl), so that the cross section of the frame 5 is substantially elliptical.
The T-shaped tubular joint 6 has a vertical extension 6(a) into which inserted is an upper end portion of the shaft 4, and horizontal extensions 6(b) and 6(c) thereof into which inserted are opposite lower end portions of the frame 5. The upper end of the shaft 4 as well as the lower ends of the frame 5 terminate at the central portion inside of the tubular joint 6. The tubular joint 6 is integrally constructed by molding aluminum or a aluminum alloy in a conventional die casting.
As is clarly shown in Fig. 4(a~ to Fig. 4(c), the tubular joint 6 has a pair of ribs 8 - 8 inte-grally formed or molded on opposite outer surfaces thereof. Each rib 8 has a relatively wide area at the central part of this outer surface and extends from this central part to free ends 6(d) - 6(f) of the joint along center lines of the vertical and horizontal extension 6(al - 6(c) in su~h a manner that the rib is formed substantially in the shape of "Tt'. The width (w) and depth (d~ of the ribs 8 - 8 are gradually reduced toward the free ends of the T-shaped joint and sharpened at these free ends of the joint. Each rib 8 thus formed also fills up a gap space 9(a~ between the vertical extension 6(a~
and horizontal extensions 6(b~ and 6(c~ of the joint in such a manner that the outer surface of the rib becomes flat.
It is demanded in the T-shaped tubular joint of this type that the highest mechanical strength is provided at the central part of the joint inside of 1~37132 which the upper end of the shaft as well as the lower free ends of the frame terminate and also that the rigidity of the T-shaped joint is not enhanced so much at the free end portions 6(a~ - 6(c) thereof so as to be able to absorb the bending stress applied thereto by the bending of the shaft and frame.
According to the present invention, the ribs 8 - 8 integrally formed on the outer surfaces of the T-shaped tubular joint 6 has a relatively wide area at the central part of this outer surface of the joint so that the central part of the joint is suf-ficiently reinforced. The width and depth of the ribs are gradually reduced toward the free ends 6(d) - 6(f~ of the T-shaped joint, so that the rigidity of the joint is reduced toward the free ends thereof.
Thus, the stresses applied to the shaft 4 and frame S at the portions 4(a), 5(b) and 5(c) adjacent to the free ends 6(d), 6(e) and 6(f) of-the joint can be reduced, respectively, compared with the conven-tional T-shaped joint having a uniform wall thickness which is higher than that of the present joint at the free end portions thereof. Further, it becomes possible by forming the ribs on the T-shaped joint to make the wall thickness of the joint thinner than that of the conventional joint except the ribbed portion and to make the weight of the present joint itself lighter than that of the conventional one.
Accordingly, it becomes possible in the present _ 9 _ 113713~
invention to provide a lighter joint with sufficient mechanical strength and not causing excessive stress concentration on the shaft and frame adjacent to the free ends of the joint. In addition, since the me-chanical strength of the present joint is increased due to the ribs integrally formed on the joint, the external dimensions of the present joint can be re-duced compared with the conventional joint. Also, the rib on the T-shaped joint has a shape of smaller "T", so that the air resistance to be developed on the joint when the present badminton racket is swung at a high speed can be reduced.
Tests carried out by using the present ribbed joint has proved that the strength of the joint in the swing direction of the frame could be enhanced by about 60% in case the overall volume of the joint is marginally increased by 5.9%.
Another preferred embodiment of the present invention is shown in Fig. 5. In this second embodi-ment, each extended end 6(a~ - 6(c) of the rib 8 is not sharpened and does not reach the free ends of the T-shaped joint, so that the rib 8 is formed in the shape of "T" analogous to the outer surface of the joint as clearly shown in Fig. 5. As it could be undenstood easily from the description set forth in connection with the first embodiment, the T-shaped tubular joint of this second embodiment can provide the same advantages as the first embodiment.
Thus, the badminton racket made by using the T-shaped joint according to the present invention can have such characteristics of sufficiently high mechanical strength, satisfactory light weight an~
minimum air resistance all at once.
Although the present invention has been de-scribed with reference to preferred embodiments thereof, modifications and alterations may be made within the spirit of the present invention.
This conventional badminton racket is thus constructed with a view to achieving a high mechanical strength to meet a high-speed swing motions in addition to light-weight, a reduced air resistance and a satisfactory resiliency. However, in this badminton .:
11~'7132 racket, various impact loads arising from the use of the racket are structurely concentrated on the small T-shaped tubular joint 3. This means that the mechanical strength necessary for the badminton racket depends heavily upon the part of the T-shaped tubular joint 3. It becomes necessary, therefore, to enhance the mechanical strength inherent in the structure of the T-shaped tubular joint 3 in order to obtain a satisfactory mechanical strength of the racket frame as a whole as well as the other requi-site elements.
Now referring to the important factor of en-hancing the mechanical strength of the T-shaped tubular joint 3, the present inventor has learned that the mere pursuit of the mechanical strength of the tubular joint may create another serious problem.
The enhanced mechanical strength of the tubular joint 3 may involve the enlargement of dimensions which causes higher air resistance. More seriously, it has been learned that the shaft 1 and frame 2 will be more subjected to material fatigue in por-tions l(a), 2(b) and 2(c) adjacent to free end por-tions 3(a) 'o 3~c) of the T-shaped tubular joint 3.
That is, when the rigidity of the joint 3 is highly increased by enhancing the mechanical strength there-of, the joint cannot be bent or twisted in harmony -with the bending and twisting of the shaft 1 and frame 2. Accordingly, the bending and twisting 113~71;~2 stresses of the shaft and frame caused by high-speed swinging motion of the racket will be concentrated to the shaft and frame portions l(a), 2(b), 2(c~
adjacent to the free end portions 3(a~, 3(b), 3(c~
of the joint 3, respectively. This will result in breakages of the shaft and frame at these portions l(a~, 2(b~ and 2(c~.
From the reasons set forth above, although it is essentially important that the joint 3 has a suffi-cient mechanical strength, it cannot be too rigid.
Hitherto, it has been difficult to provide a T-shaped tubular joint having a sufficient mechanical strength as well as a desirable rigidity not to cause break-ages of the joint itself and also the shaft and frame portions adjacent to the free ends ofthe joint.
The present invention has been developed in view of the above problems. Therefore, an object of the present invention is to provide a badminton racket having an oval frame connected to a shaft by a T-shaped tubular joint, wherein the T-shaped tubu-lar joint has a sufficient mechanical strength as well as a desirable rigidity.
Another object of the present invention is to provide a badminton racket of the type set forth above, wherein a T-shaped tubular joint can be made lighter compared with the conventional one without decreasing the mechanical strength thereof.
A further object of the present invention is 113'713~
to provide a badminton racket of the type set forth above, wherein a T-shaped tubular joint can reduce an air resistance applied thereto when the badminton racket is swung at a high speed.
A badminton racket according to the present invention comprises a T-shaped tubular joint having fixedly inserted therein an upper end portion of a shaft and lower free end por-tions of an oval frame, wherein the tubular joint has a pair of ribs integrally formed on opposite outer surfaces thereof, each rib having a relatively wide area at the central part of this outer surface and extending from this central part to respective free end portions of the joint in such a manner that the rib is formed substantially in the shape of "T" with the thickness and width thereof gradually reducing toward the free end portions of the joint.
~13'~ Z
Referring once more to the accompanying drawings and in particular to a first embodiment of the present invention shown in Figs. 3 and 4, a shaft 4 and an oval frame 5 are joined together by means of a tubular joint 6 formed substantially in the shape of "T". the material of the shaft 4 may be, for example, metal tubing of stainless steel, etc. or FRP. The shaft 4 has a circular cross section as shown in Fig. 3(b). The lower portion of the shaft 4 is connected to a grip portion 7.
The frame 5 may he made of a metal tubing or fiber reinforced pipe. The frame 5 is of irregularly rounded cross section as shown in Fig. 3(c), wherein a width (rl) thereof in the swing direction perpendicular to the racket's face is larger than a width ~r2) meeting at right angles with the width (rl), so that the cross section of the frame 5 is substantially elliptical.
The T-shaped tubular joint 6 has a vertical extension 6(a) into which inserted is an upper end portion of the shaft 4, and horizontal extensions 6(b) and 6(c) thereof into which inserted are opposite lower end portions of the frame 5. The upper end of the shaft 4 as well as the lower ends of the frame 5 terminate at the central portion inside of the tubular joint 6. The tubular joint 6 is integrally constructed by molding aluminum or a aluminum alloy in a conventional die casting.
As is clarly shown in Fig. 4(a~ to Fig. 4(c), the tubular joint 6 has a pair of ribs 8 - 8 inte-grally formed or molded on opposite outer surfaces thereof. Each rib 8 has a relatively wide area at the central part of this outer surface and extends from this central part to free ends 6(d) - 6(f) of the joint along center lines of the vertical and horizontal extension 6(al - 6(c) in su~h a manner that the rib is formed substantially in the shape of "Tt'. The width (w) and depth (d~ of the ribs 8 - 8 are gradually reduced toward the free ends of the T-shaped joint and sharpened at these free ends of the joint. Each rib 8 thus formed also fills up a gap space 9(a~ between the vertical extension 6(a~
and horizontal extensions 6(b~ and 6(c~ of the joint in such a manner that the outer surface of the rib becomes flat.
It is demanded in the T-shaped tubular joint of this type that the highest mechanical strength is provided at the central part of the joint inside of 1~37132 which the upper end of the shaft as well as the lower free ends of the frame terminate and also that the rigidity of the T-shaped joint is not enhanced so much at the free end portions 6(a~ - 6(c) thereof so as to be able to absorb the bending stress applied thereto by the bending of the shaft and frame.
According to the present invention, the ribs 8 - 8 integrally formed on the outer surfaces of the T-shaped tubular joint 6 has a relatively wide area at the central part of this outer surface of the joint so that the central part of the joint is suf-ficiently reinforced. The width and depth of the ribs are gradually reduced toward the free ends 6(d) - 6(f~ of the T-shaped joint, so that the rigidity of the joint is reduced toward the free ends thereof.
Thus, the stresses applied to the shaft 4 and frame S at the portions 4(a), 5(b) and 5(c) adjacent to the free ends 6(d), 6(e) and 6(f) of-the joint can be reduced, respectively, compared with the conven-tional T-shaped joint having a uniform wall thickness which is higher than that of the present joint at the free end portions thereof. Further, it becomes possible by forming the ribs on the T-shaped joint to make the wall thickness of the joint thinner than that of the conventional joint except the ribbed portion and to make the weight of the present joint itself lighter than that of the conventional one.
Accordingly, it becomes possible in the present _ 9 _ 113713~
invention to provide a lighter joint with sufficient mechanical strength and not causing excessive stress concentration on the shaft and frame adjacent to the free ends of the joint. In addition, since the me-chanical strength of the present joint is increased due to the ribs integrally formed on the joint, the external dimensions of the present joint can be re-duced compared with the conventional joint. Also, the rib on the T-shaped joint has a shape of smaller "T", so that the air resistance to be developed on the joint when the present badminton racket is swung at a high speed can be reduced.
Tests carried out by using the present ribbed joint has proved that the strength of the joint in the swing direction of the frame could be enhanced by about 60% in case the overall volume of the joint is marginally increased by 5.9%.
Another preferred embodiment of the present invention is shown in Fig. 5. In this second embodi-ment, each extended end 6(a~ - 6(c) of the rib 8 is not sharpened and does not reach the free ends of the T-shaped joint, so that the rib 8 is formed in the shape of "T" analogous to the outer surface of the joint as clearly shown in Fig. 5. As it could be undenstood easily from the description set forth in connection with the first embodiment, the T-shaped tubular joint of this second embodiment can provide the same advantages as the first embodiment.
Thus, the badminton racket made by using the T-shaped joint according to the present invention can have such characteristics of sufficiently high mechanical strength, satisfactory light weight an~
minimum air resistance all at once.
Although the present invention has been de-scribed with reference to preferred embodiments thereof, modifications and alterations may be made within the spirit of the present invention.
Claims (3)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A badminton racket comprsing a T-shaped tubular joint having fixedly inserted therein an upper end portion of a shaft and lower free end portions of an oval frame, wherein said tubular joint has a pair of ribs integrally formed on opposite outer surfaces thereof, each rib having a relatively wide area at the central part of said outer surface and extending from said central part to respective free end portions of said joint in such a manner that said rib is formed substantially in the shape of "T" with the thickness and width thereof gradually reducing toward said free end portions of said joint.
2. A badminton racket as claimed in claim 1, wherein said rib is sharpened toward their respec-tive extended ends, the sharpened ends of said rib reaching the corresponding free ends of said T-shaped joint.
3. A badminton racket as claimed in claim 1, wherein said rib has a T-shape in front view re-sembling to the outer surface of said T-shaped joint, the extended ends of said rib being not sharpened.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1978167603U JPS614374Y2 (en) | 1978-12-07 | 1978-12-07 | |
| JP53-167603 | 1978-12-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1137132A true CA1137132A (en) | 1982-12-07 |
Family
ID=15852825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000328284A Expired CA1137132A (en) | 1978-12-07 | 1979-05-24 | Badminton racket |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS614374Y2 (en) |
| CA (1) | CA1137132A (en) |
| DK (1) | DK155034C (en) |
| GB (1) | GB2037168B (en) |
| MY (1) | MY8500929A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4989871A (en) * | 1990-05-02 | 1991-02-05 | Sheng Chang C | Badmington racquet structure |
| US5219166A (en) * | 1992-02-06 | 1993-06-15 | Chang Chen Chung | Metal racket |
| JP2004065862A (en) * | 2002-08-09 | 2004-03-04 | Yonex Co Ltd | Badminton racket |
| US7211010B2 (en) * | 2005-09-03 | 2007-05-01 | Wilson Sporting Goods Co. | Reinforcing member for a badminton racquet |
| US7727094B2 (en) * | 2008-02-22 | 2010-06-01 | Pick-A-Paddle, Inc. | Institutional badminton racket |
| WO2010041362A1 (en) * | 2008-10-09 | 2010-04-15 | 株式会社薫風 | Badminton racket |
| FR2996462B1 (en) * | 2012-10-04 | 2014-12-19 | Babolat Vs | BADMINTON RACKET |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1306485A (en) * | 1971-12-03 | 1973-02-14 | Yoneyama Racket Kk | Badminton racket |
| GB1446306A (en) * | 1972-05-10 | 1976-08-18 | Tansiglen Ltd | Rackets |
| GB1479454A (en) * | 1974-07-09 | 1977-07-13 | Allen E | Games racket |
| US4119313A (en) * | 1975-07-12 | 1978-10-10 | Dunlop Limited | Games racquets |
-
1978
- 1978-12-07 JP JP1978167603U patent/JPS614374Y2/ja not_active Expired
-
1979
- 1979-05-24 CA CA000328284A patent/CA1137132A/en not_active Expired
- 1979-05-30 GB GB7918844A patent/GB2037168B/en not_active Expired
- 1979-06-21 DK DK260179A patent/DK155034C/en not_active IP Right Cessation
-
1985
- 1985-12-30 MY MY929/85A patent/MY8500929A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DK155034C (en) | 1989-06-05 |
| DK155034B (en) | 1989-01-30 |
| GB2037168A (en) | 1980-07-09 |
| DK260179A (en) | 1980-06-08 |
| JPS614374Y2 (en) | 1986-02-10 |
| GB2037168B (en) | 1982-11-24 |
| JPS5585061U (en) | 1980-06-12 |
| MY8500929A (en) | 1985-12-31 |
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