EP0080797A2 - Cadre de raquette métallique - Google Patents
Cadre de raquette métallique Download PDFInfo
- Publication number
- EP0080797A2 EP0080797A2 EP82305062A EP82305062A EP0080797A2 EP 0080797 A2 EP0080797 A2 EP 0080797A2 EP 82305062 A EP82305062 A EP 82305062A EP 82305062 A EP82305062 A EP 82305062A EP 0080797 A2 EP0080797 A2 EP 0080797A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- frame
- racket frame
- tubular member
- foamed core
- metal
- 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.)
- Withdrawn
Links
Images
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
- A63B49/12—Frames made of metal
-
- 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
- A63B60/54—Details or accessories of golf clubs, bats, rackets or the like with means for damping vibrations
Definitions
- This invention relates to a frame of a racket for tennis, badminton etc., and particularly to those made of metals.
- rackets with metal tubular frames are constructed in two forms, oval-shaped tubular structure and I-beam with two tubular ends.
- racket frames are principally designed for strength and stiffness, such metal frames usually cannot possess a minimum desired weight due to the characteristic of the materials. Additionally, when striking the ball, shock and vibration will be transmitted to the hand of the player, especially when the stroke point is not at the centre of the racket. Therefore the player will easily feel fatigued and sometimes even get hurt.
- the preferred form of metal racket frame to be employed in this invention is oval-shaped tubular structure. It is proposed by the inventor after he made a test for rigidity of the above two structures.
- Figure 1 is a diagrammatic illustration with data of tests for rigidity in respect of the above two forms of frame, both of which have similar dimensions A, B, C and D as shown.
- the handle portions thereof are supported fixedly and a load of 15 pounds is hung at the other free end of the frame. It is seen that the oval shaped tubular structure is bent such that the free end thereof deflects to a position having a distance of 20.2 mm from the original position, the cross-sections being 152.4 mm and 304.8 mm distant from the free end deflect to a position 9.9 mm and 5.6 mm distant from the original position respectively.
- the I-beam frame makes a deflection that the free end, the cross-sections being at 152.4 mm and 304.8 mm distant from the free end move to the positions 23.92 mm, 11.2 mm and 6.11 mm distant from the original positions.
- the oval-shaped tubular frame has higher strength and rigidity than the other one.
- the object of the invention is further to improve the characteristics of the frame.
- a racket frame comprises an elongated metal tubular member of hollow oval cross-section bent to form a head portion and a handle portion, characterised in that the oval section metal tubular member includes an elongated rigid foamed core filled therein.
- the wall thickness of the metal may be reduced, thereby reducing the weight of the frame.
- the foamed core reduces the vibration induced upon stroke.
- the oval section tubular member is made of aluminium alloy and the foamed core is formed of a foamable polyurethane based composition.
- a racket frame 10 of the present invention comprises a thin, elongated metal tube of oval cross-section bent to form a head portion 11 and a handle portion 12 of the frame.
- This metal tube is made of aluminium alloy and the inside thereof is provided with a rigid foamed core 15 as shown in Figure 3.
- This rigid foamed core is formed by inserting a foamable polyurethane based composition into the tube, heating to a certain temperature, and allowing it to expand and cure.
- the formed frame 10 has an elongated metal shell 13 and a rigid foamed core 15 to reduce the weight of the frame.
- the wall thickness of an aluminium alloy frame may be reduced to from 0.70 to 1.05 mm, compared to the 1.1 mm wall thickness shown in Figure 1 as being commonly used in prior art frames. Due to the presence of the foamed core 15 the metal tubular frame 10 is also improved in that the vibration characteristic thereof becomes less when comparing with the metal frame without foamed core.
- Figures 4(b) and (a) are the diagrammatic representations of the vibration of the frame 10 constructed according to the invention and the frame without foamed core.
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Laminated Bodies (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US32537081A | 1981-11-27 | 1981-11-27 | |
US325370 | 1981-11-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0080797A2 true EP0080797A2 (fr) | 1983-06-08 |
EP0080797A3 EP0080797A3 (en) | 1984-03-07 |
Family
ID=23267608
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP82305062A Withdrawn EP0080797A3 (en) | 1981-11-27 | 1982-09-24 | Metal racket frame |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP0080797A3 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2163963A (en) * | 1984-09-07 | 1986-03-12 | Dunlop Ltd | Games rackets |
DE3726441A1 (de) * | 1987-08-08 | 1989-02-16 | Tegro Gmbh | Schlaeger fuer tennis, squash oder badminton aus einem metallrahmen sowie dessen herstellung |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2126488A5 (en) * | 1971-02-08 | 1972-10-06 | Carpano & Pons | Tennis racquet frame - of stiff lightweight resin lined metal tubing |
FR2336952A1 (fr) * | 1975-12-31 | 1977-07-29 | Credi Sa | Profile ameliore, en particulier pour la realisation de cadres de raquettes de tennis |
FR2359619A2 (fr) * | 1976-07-29 | 1978-02-24 | Rossignol Sa | Raquette de tennis |
DE2800572A1 (de) * | 1978-01-07 | 1979-07-12 | Reinhold Sommer | Rahmen fuer einen tennisschlaeger |
-
1982
- 1982-09-24 EP EP82305062A patent/EP0080797A3/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2126488A5 (en) * | 1971-02-08 | 1972-10-06 | Carpano & Pons | Tennis racquet frame - of stiff lightweight resin lined metal tubing |
FR2336952A1 (fr) * | 1975-12-31 | 1977-07-29 | Credi Sa | Profile ameliore, en particulier pour la realisation de cadres de raquettes de tennis |
FR2359619A2 (fr) * | 1976-07-29 | 1978-02-24 | Rossignol Sa | Raquette de tennis |
DE2800572A1 (de) * | 1978-01-07 | 1979-07-12 | Reinhold Sommer | Rahmen fuer einen tennisschlaeger |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2163963A (en) * | 1984-09-07 | 1986-03-12 | Dunlop Ltd | Games rackets |
DE3726441A1 (de) * | 1987-08-08 | 1989-02-16 | Tegro Gmbh | Schlaeger fuer tennis, squash oder badminton aus einem metallrahmen sowie dessen herstellung |
Also Published As
Publication number | Publication date |
---|---|
EP0080797A3 (en) | 1984-03-07 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: LO, KUN NAN |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
17P | Request for examination filed |
Effective date: 19840831 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19851113 |