EP0215706A1 - Table tennis plate - Google Patents
Table tennis plate Download PDFInfo
- Publication number
- EP0215706A1 EP0215706A1 EP86401936A EP86401936A EP0215706A1 EP 0215706 A1 EP0215706 A1 EP 0215706A1 EP 86401936 A EP86401936 A EP 86401936A EP 86401936 A EP86401936 A EP 86401936A EP 0215706 A1 EP0215706 A1 EP 0215706A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- peripheral frame
- core
- tray according
- rigid
- rebound
- 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- Withdrawn
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Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
- A47B25/00—Card tables; Tables for other games
- A47B25/003—Card tables; Tables for other games for table tennis
Definitions
- the present invention relates to a table top for a table tennis game.
- the object of the invention is therefore to provide a tray which offers the same playing characteristics as the traditional material, which has both a suitable weight and mechanical strength, and which, in addition retains its properties when subjected prolonged weathering.
- the invention provides a table tennis game board, comprising a rigid foam core of synthetic material covered on its upper face and its lower face by a metal sheet bonded to the core, with on its edges. a peripheral frame for finishing and sealing, and such that the rebound of a ping-pong ball falling from 300 mm onto the plate is between 210 and 240 mm, characterized in that, simultaneously: . the metal sheet forming the faces is a prepainted galvanized steel sheet, with a thickness of between 0.5 and 1.5 mm; and . the rigid foam forming the core has a density of between 130 and 180 kg / m3.
- the peripheral frame comprises profiles in extruded PVC.
- the frame comprises strips of semi-rigid foam, for example PVC.
- the peripheral frame includes corners in molded ABS.
- the tray which is the subject of Figures 1 and 2, where the thickness of the tray has been greatly exaggerated to facilitate the presentation, comprises a core 1 of rigid foam of synthetic material which has been formed between an upper sheet 2 and a lower sheet 3 and adheres thereto.
- the plate is provided on its edges with a peripheral frame formed of profiles 4 in extruded PVC, retained by the folded edges 5 of the sheets 2 and 3.
- the frame is completed at the corners by corners in molded ABS.
- the profiles 4 of extruded PVC are replaced by rods 6 of semi-rigid PVC, obtained by molding.
- This slightly more expensive solution has two advantages: under the effect of the pressure which develops during the formation of the foam, the semi-rigid PVC deforms outwards and fills the hollow between the folded edges 5 of the sheets 2 and 3, until it forms a roughly flat and more aesthetic side surface.
- the deformability of the semi-rigid material ensures a better seal and more surely protects against the risk of foam leakage when it is formed.
- a first condition is the value of the rebound. This is measured by a method illustrated in Figure 4.
- This method consists in freely dropping a table tennis ball 10 placed on a support 11 very slightly inclined, the upper end of which is level: + 300 mm relative to that of the upper face of the sample 12 whose behavior rebound must be tested.
- the simplest method consists in using a fine horizontal blade 13 which emits a noise embodying the value of the rebound when it is touched by the ball 10. This blade is carried by a support 14.
- N (mm) R (mm) + D (mm) D is the diameter of the ball, it is equal to 37 mm.
- the rebound measured must be 210 to 240 mm.
- the weight of the tray must be sufficient so that it does not risk being moved inadvertently by the action of the wind, but it must not be exaggerated to allow easy handling.
- the mechanical resistance must also allow it to carry the weight of a person who would accidentally have to walk on the platform.
- the density of the foam forming the core acts appreciably on the rebound: when, for thicknesses of the upper and lower sheets of 0.6 mm, the density of the foam varies from 90 to 140 kg / m3, the rebound varies from 210 to 230 mm.
- the increase in density also increases the mechanical resistance of the assembly, by opposing the deformation of the sheets.
- the thickness of foam has an opposite direction: if this thickness goes from 17 mm to 29 mm, the thickness of the sheets being 0.6 mm, the rebound decreases from 230 mm to 224 mm.
- a polyurethane foam is preferred which improves rebound.
- An increase in the thickness of the sheets has a favorable influence on the rebound: when the thickness of the upper sheet changes from 0.6 to 1 mm, the core being formed from a foam with a density of 140 kg / cm2 and l he overall thickness of the plate being fixed at 18 mm, the rebound goes from 230 to 234.
- an increase in thickness of the lower sheet gives a similar result, although less pronounced.
- the peripheral frame 4,6 which surrounds the plate is put in place before the formation of the foam, and ensures the confinement of the latter during its expansion, in cooperation with the sheets. It therefore adheres to the foam in the finished product.
- the corners 7 are placed in the same way and have the same role.
- peripheral frame and the corners effectively prevent water and moisture from entering the foam, such penetration could affect the life of the assembly.
- they constitute an aesthetic finish of the tray.
- the corners 7 have a rounded shape which eliminates the risk of injury.
Abstract
Description
La présente invention est relative à un plateau de table pour jeu de tennis de table.The present invention relates to a table top for a table tennis game.
Pour le tennis de table on utilise traditionnellement un plateau en bois, généralement en contreplaqué. Ce matériau est convenable à l'intérieur d'un bâtiment, mais il supporte assez mal d'être en permanence laissé à l'extérieur et exposé aux intempéries. On a proposé pour ce cas d'utiliser des matériaux plus modernes, déjà utilisés en revêtement de murs, tels qu'une plaque de matériau synthétique recouverte sur ses deux faces d'une feuille d'aluminium.For table tennis we traditionally use a wooden tray, usually plywood. This material is suitable for the interior of a building, but it tolerates quite badly to be permanently left outside and exposed to bad weather. For this case, it has been proposed to use more modern materials, already used for wall cladding, such as a plate of synthetic material covered on both sides with aluminum foil.
Par exemple dans FR-A-2 240 029, on propose d'utiliser soit une plaque de matière mousse de densité 700 à 200 kg/m³ recouverte d'une feuille d'aluminium de 0,4 à 2 mm, soit une plaque de matière mousse de densité 220 à 150 kg/m³ recouverte d'une feuille de fibre vulcanisée de 0,8 à 2 mm.For example in FR-A-2 240 029, it is proposed to use either a plate of foam material of density 700 to 200 kg / m³ covered with an aluminum sheet of 0.4 to 2 mm, or a plate of foam material with a density of 220 to 150 kg / m³ covered with a sheet of vulcanized fiber of 0.8 to 2 mm.
Ces nouveaux matériaux n'ont pas toujours exactement les mêmes qualités de rebond de la balle que le matériau traditionnel. En outre ils sont légers, par suite doivent être solidaires d'un support pour ne pas être déplacés sous l'action du vent. Enfin, leur résistance mécanique est parfois insuffisante pour supporter le poids d'une personne se déplaçant accidentellement sur le plateau.These new materials do not always have exactly the same rebound qualities of the ball as the traditional material. They are also light, therefore must be secured to a support so as not to be moved by the action of the wind. Finally, their mechanical strength is sometimes insufficient to support the weight of a person accidentally moving on the platform.
Le but de l'invention est donc de fournir un plateau qui offre les mêmes caractéristiques de jeu que le matériau traditionnel, que présente à la fois un poids et une résistance mécanique convenables, et qui, en plus conserve ses propriétés lorsqu'il est soumis aux intempéries de façon prolongée.The object of the invention is therefore to provide a tray which offers the same playing characteristics as the traditional material, which has both a suitable weight and mechanical strength, and which, in addition retains its properties when subjected prolonged weathering.
Pour obtenir ce résultat, l'invention fournit un plateau pour jeu de tennis de table, comportant une âme en mousse rigide de matière synthétique recouverte sur sa face supérieure et sa face inférieure par une tôle métallique collée sur l'âme, avec sur ses bords un cadre périphérique de finition et d'étanchéité, et telle que le rebond d'une balle de ping-pong tombant de 300 mm sur le plateau est compris entre 210 et 240 mm, caractérisé en ce que, simultanément:
. la tôle métallique formant les faces est une tôle d'acier galvanisé prélaqué, d'une épaisseur compris entre 0,5 et 1,5 mm; et
. la mousse rigide formant l'âme a une densité comprise entre 130 et 180 kg/m³.To obtain this result, the invention provides a table tennis game board, comprising a rigid foam core of synthetic material covered on its upper face and its lower face by a metal sheet bonded to the core, with on its edges. a peripheral frame for finishing and sealing, and such that the rebound of a ping-pong ball falling from 300 mm onto the plate is between 210 and 240 mm, characterized in that, simultaneously:
. the metal sheet forming the faces is a prepainted galvanized steel sheet, with a thickness of between 0.5 and 1.5 mm; and
. the rigid foam forming the core has a density of between 130 and 180 kg / m³.
De préférence, le cadre périphérique comprend des profilés en PVC extrudé.Preferably, the peripheral frame comprises profiles in extruded PVC.
Suivant une modalité encore préférée, le cadre comprend des baguettes en mousse semi-rigide, par example en PVC.According to an even more preferred method, the frame comprises strips of semi-rigid foam, for example PVC.
Avantageusement, le cadre périphérique comprend des coins en ABS moulé.Advantageously, the peripheral frame includes corners in molded ABS.
L'invention va maintenant être exposée plus en détail à l'aide d'un exemple pratique, non limitatif, illustré à l'aide des dessins, parmi lesquels:
- La figure 1 est une vue en perspective, avec coupe partielle, du plateau selon l'invention.
- La figure 2 est une coupe d'un bord du plateau de la figure 1.
- La figure 3 correspond à une variante de la figure 2.
- La figure 4 est un schéma de la méthode de mesure du rebond.
- Figure 1 is a perspective view, partly in section, of the tray according to the invention.
- Figure 2 is a section through an edge of the tray of Figure 1.
- FIG. 3 corresponds to a variant of FIG. 2.
- Figure 4 is a diagram of the rebound measurement method.
Le plateau qui fait l'objet des figures 1 et 2, où l'épaisseur de plateau a été très exagérée pour faciliter l'exposé, comprend une âme 1 en mousse rigide de matière synthétique qui a été formée entre une tôle supérieure 2 et une tôle inférieure 3 et adhère à celles-ci.The tray which is the subject of Figures 1 and 2, where the thickness of the tray has been greatly exaggerated to facilitate the presentation, comprises a core 1 of rigid foam of synthetic material which has been formed between an
Le plateau est pourvu sur ses bords d'un cadre périphérique formé de profilés 4 en PVC extrudé, retenus par les bords pliés 5 des tôles 2 et 3. Le cadre est complété aux angles par des coins en ABS moulé.The plate is provided on its edges with a peripheral frame formed of profiles 4 in extruded PVC, retained by the folded edges 5 of the
Selon la variante illustrée à la figure 3, les profilés 4 en PVC extrudé sont remplacés par des baguettes 6 en PVC semi-rigide, obtenus par moulage. Cette solution un peu plus coûteuse présente deux avantages: sous l'effet de la pression qui se développe lors de la formation de la mousse, le PVC semi-rigide se déforme vers l'extérieur et vient combler le creux entre les bords pliés 5 des tôles 2 et 3, jusqu'à former une surface latérale à peu près plane et plus esthétique. En outre, la déformabilité de la matière semi-rigide assure une meilleure étanchéité et préserve plus sûrement du risque de fuites de mousse lorsque celle-ci se forme.According to the variant illustrated in Figure 3, the profiles 4 of extruded PVC are replaced by rods 6 of semi-rigid PVC, obtained by molding. This slightly more expensive solution has two advantages: under the effect of the pressure which develops during the formation of the foam, the semi-rigid PVC deforms outwards and fills the hollow between the folded edges 5 of the
Les spécifications de l'âme et des tôles supérieure et inférieure doivent obéir à des conditions précises.The specifications of the core and of the upper and lower plates must comply with precise conditions.
Une première condition est la valeur du rebond. Celui-ci est mesuré par une méthode illustrée à la figure 4.A first condition is the value of the rebound. This is measured by a method illustrated in Figure 4.
Cette méthode consiste à laisser librement tomber une balle de tennis de table 10 disposée sur un support 11 très légèrement incliné dont l'extrémité supérieure est au niveau: + 300 mm par rapport à celui de la face supérieure de l'échantillon 12 dont le comportement au rebond doit être testé.This method consists in freely dropping a
Il convient ensuite de mesurer le niveau maxi atteint par la balle 10 lors de son rebond.It is then necessary to measure the maximum level reached by the
La méthode la plus simple consiste à utiliser une lame fine 13 horizontale qui émet un bruit concrétisant la valeur du rebond lorsqu'elle est touchée par la balle 10. Cette lame est portée par un support 14.The simplest method consists in using a fine
Il est bien évident que le niveau N de la lame fine est relié au rebond R par l'équation
N(mm) = R (mm) + D(mm)
D est le diamètre de la balle, il est égal à 37 mm.It is obvious that the level N of the thin blade is linked to the rebound R by the equation
N (mm) = R (mm) + D (mm)
D is the diameter of the ball, it is equal to 37 mm.
Suivant les règles des autorités sportives, le rebond mesuré doit être de 210 à 240 mm.According to the rules of the sports authorities, the rebound measured must be 210 to 240 mm.
D'autre part le poids du plateau doit être suffisant pour qu'il ne risque pas d'être déplacé intempestivement par l'action du vent, mais il ne doit pas être exagéré pour permettre des manipulations faciles.On the other hand the weight of the tray must be sufficient so that it does not risk being moved inadvertently by the action of the wind, but it must not be exaggerated to allow easy handling.
Comme on l'a dit déjà, la résistance mécanique doit aussi lui permettre de porter le poids d'une personne qui serait amenée accidentellement à marcher sur le plateau.As we have already said, the mechanical resistance must also allow it to carry the weight of a person who would accidentally have to walk on the platform.
Les diverses spécifications de l'âme et des tôles ne sont donc pas indépendantes.The various specifications of the core and the sheets are therefore not independent.
La densité de la mousse formant l'âme agit de façon appréciable sur le rebond: lorsque, pour des épaisseurs des tôles supérieure et inférieure de 0,6 mm, la densité de la mousse varie de 90 à 140 kg/m³, le rebond varie de 210 à 230 mm.The density of the foam forming the core acts appreciably on the rebound: when, for thicknesses of the upper and lower sheets of 0.6 mm, the density of the foam varies from 90 to 140 kg / m³, the rebound varies from 210 to 230 mm.
L'augmentation de densité augmente par ailleurs la résistance mécanique de l'ensemble, en s'opposant à la déformation des tôles.The increase in density also increases the mechanical resistance of the assembly, by opposing the deformation of the sheets.
On a constaté que l'épaisseur de mousse a une influence de sens opposé: si cette épaisseur passe de 17 mm à 29 mm, l'épaisseur des tôles étant de 0,6 mm, le rebond diminue de 230 mm à 224 mm.It has been found that the thickness of foam has an opposite direction: if this thickness goes from 17 mm to 29 mm, the thickness of the sheets being 0.6 mm, the rebound decreases from 230 mm to 224 mm.
La nature de la mousse a également une influence. On préfère une mousse de polyuréthane qui améliore le rebond. Une augmentation de l'épaisseur des tôles a une influence favorable sur le rebond: quand l'épaisseur de la tôle supérieure passe de 0,6 à 1 mm, l'âme étant formée d'une mousse de densité 140 kg/cm² et l'épaisseur hors tout du plateau étant fixée à 18 mm, le rebond passe de 230 à 234. Chose surprenante, une augmentation d'épaisseur de la tôle inférieure donne un résultat de même genre, quoique moins prononcé. On est toutefois limité dans cette voie par des considérations de poids: une augmentation d'épaisseur d'une dixième de millimètre pour une seule des tôles augmente le poids total de la table de plus de 3 kg.The nature of the foam also has an influence. A polyurethane foam is preferred which improves rebound. An increase in the thickness of the sheets has a favorable influence on the rebound: when the thickness of the upper sheet changes from 0.6 to 1 mm, the core being formed from a foam with a density of 140 kg / cm² and l he overall thickness of the plate being fixed at 18 mm, the rebound goes from 230 to 234. Surprisingly, an increase in thickness of the lower sheet gives a similar result, although less pronounced. We are however limited in this way by weight considerations: an increase in thickness of one tenth of a millimeter for a single sheet increases the total weight of the table by more than 3 kg.
Le cadre périphérique 4,6 qui entoure le plateau est mis en place avant la formation de la mousse, et assure le confinement de celle-ci pendant son expansion, en coopération avec les tôles. Il adhère donc à la mousse dans le produit fini.The peripheral frame 4,6 which surrounds the plate is put in place before the formation of the foam, and ensures the confinement of the latter during its expansion, in cooperation with the sheets. It therefore adheres to the foam in the finished product.
Les coins 7 sont placés de la même façon et ont le même rôle.The
Le cadre périphérique et les coins empêchent efficacement l'eau et l'humidité de pénétrer dans la mousse, une telle pénétration pourrait nuire à la durée de l'ensemble. En outre ils constituent une finition esthéthique du plateau. Les coins 7 ont une forme arrondie qui supprime le risque de blessure.The peripheral frame and the corners effectively prevent water and moisture from entering the foam, such penetration could affect the life of the assembly. In addition they constitute an aesthetic finish of the tray. The
Claims (6)
caractérisé en ce que, simultanément:
. la tôle métallique formant les faces (2, 3) est une tôle d'acier galvanisé prélaqué, d'une épaisseur comprise entre 0,5 et 1,5 mm; et
. la mousse rigide formant l'âme (1) a une densité comprise entre 130 et 180 kg/m³.1. Table tennis game board comprising a core (1) of rigid synthetic foam covered on its upper face (2) and its lower face (3) by a metal sheet bonded to the core, with on its edges a peripheral frame (4, 6, 7) for finishing and sealing, and such that the rebound of a ping-pong ball falling from 300 mm onto the plate is between 210 and 240 mm,
characterized in that, simultaneously:
. the metal sheet forming the faces (2, 3) is a prepainted galvanized steel sheet, with a thickness of between 0.5 and 1.5 mm; and
. the rigid foam forming the core (1) has a density of between 130 and 180 kg / m³.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8513106A FR2586573B1 (en) | 1985-09-04 | 1985-09-04 | TABLE TENNIS GAME BOARD |
| FR8513106 | 1985-09-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0215706A1 true EP0215706A1 (en) | 1987-03-25 |
Family
ID=9322606
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP86401936A Withdrawn EP0215706A1 (en) | 1985-09-04 | 1986-09-03 | Table tennis plate |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0215706A1 (en) |
| FR (1) | FR2586573B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2636540A1 (en) * | 1988-09-22 | 1990-03-23 | Cornilleau C | TABLE TENNIS TABLE TOP |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112933561A (en) * | 2021-03-05 | 2021-06-11 | 沈阳体育学院 | Intelligent table tennis bounciness and collision strength detection device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3235040A (en) * | 1963-05-03 | 1966-02-15 | Dow Chemical Co | Sandwich panel structure with edge trim |
| US3386218A (en) * | 1966-06-08 | 1968-06-04 | Elwin G Smith & Co Inc | Building panel with ribbed sealing element between overlapping edges |
| DE1303270B (en) * | 1964-09-19 | 1973-01-25 | ||
| FR2240029A1 (en) * | 1973-08-06 | 1975-03-07 | Lemke Fabrik Sportartikel Expo | Layered table for table-tennis - comprising a covering surface and a core of foamed plastic filler |
| US4320614A (en) * | 1980-01-07 | 1982-03-23 | General Electric Company | Panel assembly for sheet metal panels having double wall construction corners |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR970477A (en) * | 1948-08-10 | 1951-01-04 | Ping pong table | |
| DE2455102A1 (en) * | 1974-11-21 | 1976-08-12 | Rudolf Neumann | Weatherproof tabletennis table with iron tabletop - has fluid sprayed on back for extra bounce in playing surface |
-
1985
- 1985-09-04 FR FR8513106A patent/FR2586573B1/en not_active Expired
-
1986
- 1986-09-03 EP EP86401936A patent/EP0215706A1/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3235040A (en) * | 1963-05-03 | 1966-02-15 | Dow Chemical Co | Sandwich panel structure with edge trim |
| DE1303270B (en) * | 1964-09-19 | 1973-01-25 | ||
| US3386218A (en) * | 1966-06-08 | 1968-06-04 | Elwin G Smith & Co Inc | Building panel with ribbed sealing element between overlapping edges |
| FR2240029A1 (en) * | 1973-08-06 | 1975-03-07 | Lemke Fabrik Sportartikel Expo | Layered table for table-tennis - comprising a covering surface and a core of foamed plastic filler |
| US4320614A (en) * | 1980-01-07 | 1982-03-23 | General Electric Company | Panel assembly for sheet metal panels having double wall construction corners |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2636540A1 (en) * | 1988-09-22 | 1990-03-23 | Cornilleau C | TABLE TENNIS TABLE TOP |
| EP0362025A1 (en) * | 1988-09-22 | 1990-04-04 | C. Cornilleau, Société dite: | Platform for table tennis |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2586573B1 (en) | 1988-12-16 |
| FR2586573A1 (en) | 1987-03-06 |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| 17P | Request for examination filed |
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| 17Q | First examination report despatched |
Effective date: 19880919 |
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| 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 |
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| 18D | Application deemed to be withdrawn |
Effective date: 19890331 |
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| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: LABORDE, FELIX Inventor name: HUVET, JEAN-MARIE |