WO1994002215A1 - Druckgefüllter tennisball - Google Patents
Druckgefüllter tennisball Download PDFInfo
- Publication number
- WO1994002215A1 WO1994002215A1 PCT/EP1993/001598 EP9301598W WO9402215A1 WO 1994002215 A1 WO1994002215 A1 WO 1994002215A1 EP 9301598 W EP9301598 W EP 9301598W WO 9402215 A1 WO9402215 A1 WO 9402215A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tennis ball
- wall
- barrier layer
- diffusion barrier
- natural rubber
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B39/00—Hollow non-inflatable balls, i.e. having no valves
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B39/00—Hollow non-inflatable balls, i.e. having no valves
- A63B39/02—Arrangements for maintaining the pressure
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B39/00—Hollow non-inflatable balls, i.e. having no valves
- A63B39/02—Arrangements for maintaining the pressure
- A63B2039/022—Arrangements for maintaining the pressure using special gas-impermeable layers
Definitions
- the invention relates to a pressure-filled tennis ball.
- the wall of the raw ball core surrounding the pressure-filled interior of such a tennis ball usually consists of a rubber mixture, consisting essentially of polymer, filler and vulcanizate.
- Natural rubber is mainly used as the polymer, since experience has shown that the combination of natural rubber / air cushion has provided the best playing behavior of a tennis ball for decades. Attempts have been made to simulate the playing behavior of such pressure-filled tennis balls by means of so-called pressure-free balls, but this is only insufficiently successful. The reason for this is that unpressurized tennis balls have a thicker and therefore less elastically deformable wall of the raw ball core to compensate for the air cushion.
- the object of the present invention is to provide a pressure-filled tennis ball of the type mentioned in the introduction, in which the pressure drop due to diffusion through the wall of the raw ball core is largely avoided, in particular during the storage period.
- the wall has a thin diffusion barrier layer made of a plastic or a rubber, the permeability for N and / or 0 "is lower than that of the natural rubber mixture of the wall.
- the additional diffusion barrier layer ensures that a drop in pressure and thus softening of the tennis ball is significantly reduced during the storage period.
- each layer of the ball wall which does not consist of a natural rubber mixture, can impair the playing behavior of the tennis ball.
- the diffusion barrier layer can be kept so thin that the game behavior is not adversely affected compared to the conventional pressure-filled tennis ball.
- the diffusion barrier layer Since the diffusion barrier capacity also decreases with the thickness of the diffusion barrier layer, the diffusion barrier layer must not be too thin.
- the diffusion barrier layer since the diffusion barrier layer increasingly influences the playing behavior of the pressure-filled tennis ball with increasing strength, in an advantageous further development of the tennis ball according to the invention, the diffusion barrier layer is designed with regard to its strength and material properties so that it tears open under the impact stresses when playing tennis.
- the diffusion barrier layer prevents the natural diffusion of the rubber wall of the raw ball core to the extent necessary during the storage period of the tennis ball, the play behavior of a tennis ball designed in accordance with the invention, determined by the elasticity of the wall, is nevertheless achieved by the diffusion barrier layer despite a certain thickness not impaired since it tears open immediately at the start of the game.
- the diffusion barrier layer has such an elasticity behavior due to its thickness and material properties that it in any case the thermal expansions occurring during storage under the usual temperature fluctuations hold on.
- the thickness and material properties of the diffusion barrier layer can, for example, be selected so that even unusual temperature changes, for example in the range from -20 ° C. to + 100 ° C., are taken into account.
- the permeability of the material of the diffusion barrier layer for N_ and / or 0_ is at least a factor 10 less than that of the natural rubber mixture from which the wall of the raw ball core is made .
- the invention further proposes that the strong the diffusion barrier layer is only in the order of a few 10 m.
- Suitable materials for the diffusion barrier layer according to the invention are, in particular, polymers such as polyvinylidene chloride, polychlorotrifluoroethylene, polyethylene terephthalate, polyamide, polyvinyl chloride, polyethylene, polystyrene, polyisobutylene or polypropylene, but also, for example, cellulose acetate, butyl rubber or neoprene and other materials ⁇ clear diffusion barrier properties for air.
- the diffusion barrier layer can be applied on the inside or outside of the wall made of the natural rubber mixture, so that simple manufacture is possible.
- FIG. 1 The only figure of the drawing illustrates a pressure-filled tennis ball 1 having the invention.
- Its spherical raw ball core filled with air under pressure has a wall 2, the polymer component of which essentially consists of natural rubber.
- the wall 2 is complete on the inside, i.e. uninterrupted, with a thin diffusion barrier layer 3 e.g. made of polyvinylidene chloride and a thickness of a few microns. Outside the wall 2 is provided with the usual felt covering 4.
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Laminated Bodies (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6504101A JPH07508907A (ja) | 1992-07-25 | 1993-06-23 | 圧力充填式テニスボール |
EP93914698A EP0652793A1 (de) | 1992-07-25 | 1993-06-23 | Druckgefüllter tennisball |
KR1019940704686A KR950702132A (ko) | 1992-07-25 | 1994-12-22 | 압력 충전 테니스 보올 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP4224705.5 | 1992-07-25 | ||
DE4224705A DE4224705C1 (de) | 1992-07-25 | 1992-07-25 | Druckgefüllter Tennisball |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994002215A1 true WO1994002215A1 (de) | 1994-02-03 |
Family
ID=6464160
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1993/001598 WO1994002215A1 (de) | 1992-07-25 | 1993-06-23 | Druckgefüllter tennisball |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0652793A1 (de) |
JP (1) | JPH07508907A (de) |
KR (1) | KR950702132A (de) |
DE (2) | DE9211769U1 (de) |
TW (1) | TW245644B (de) |
WO (1) | WO1994002215A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5593157A (en) * | 1995-05-10 | 1997-01-14 | Gencorp Inc. | Long life, low air permeable pressurized articles such as play balls |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE812236C (de) * | 1949-07-20 | 1951-08-27 | Continental Gummi Werke Ag | Spiel- oder Sportball und Verfahren zur Herstellung |
FR2527458A1 (fr) * | 1982-05-27 | 1983-12-02 | Soulie Louis | Balles et ballons ayant un coefficient de restitution meilleur et une duree de vie plus longue |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE556255C (de) * | 1929-09-24 | 1932-08-05 | Kalle & Co Akt Ges | Hohlbaelle aus Gummi, die mit Luft oder Gas gefuellt sind, insbesondere Tennisbaelle |
GB1508493A (en) * | 1975-04-30 | 1978-04-26 | Dunlop Ltd | Tennis balls |
US4830370A (en) * | 1987-12-21 | 1989-05-16 | Schlesinger Robert M | Game ball |
-
1992
- 1992-07-25 DE DE9211769U patent/DE9211769U1/de not_active Expired - Lifetime
- 1992-07-25 DE DE4224705A patent/DE4224705C1/de not_active Expired - Fee Related
-
1993
- 1993-06-02 TW TW082104408A patent/TW245644B/zh active
- 1993-06-23 JP JP6504101A patent/JPH07508907A/ja active Pending
- 1993-06-23 WO PCT/EP1993/001598 patent/WO1994002215A1/de not_active Application Discontinuation
- 1993-06-23 EP EP93914698A patent/EP0652793A1/de not_active Withdrawn
-
1994
- 1994-12-22 KR KR1019940704686A patent/KR950702132A/ko not_active Application Discontinuation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE812236C (de) * | 1949-07-20 | 1951-08-27 | Continental Gummi Werke Ag | Spiel- oder Sportball und Verfahren zur Herstellung |
FR2527458A1 (fr) * | 1982-05-27 | 1983-12-02 | Soulie Louis | Balles et ballons ayant un coefficient de restitution meilleur et une duree de vie plus longue |
Non-Patent Citations (2)
Title |
---|
DATABASE WPI Week 8017, Derwent Publications Ltd., London, GB; AN 80-30462C * |
DATABASE WPIL Week 9023, Derwent Publications Ltd., London, GB; AN 90-171687 * |
Also Published As
Publication number | Publication date |
---|---|
DE4224705C1 (de) | 1993-11-25 |
JPH07508907A (ja) | 1995-10-05 |
KR950702132A (ko) | 1995-06-19 |
DE9211769U1 (de) | 1993-01-14 |
EP0652793A1 (de) | 1995-05-17 |
TW245644B (de) | 1995-04-21 |
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