WO1999014987A1 - Supporting plate for microwave rotating oven tray - Google Patents

Supporting plate for microwave rotating oven tray Download PDF

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Publication number
WO1999014987A1
WO1999014987A1 PCT/FR1998/002001 FR9802001W WO9914987A1 WO 1999014987 A1 WO1999014987 A1 WO 1999014987A1 FR 9802001 W FR9802001 W FR 9802001W WO 9914987 A1 WO9914987 A1 WO 9914987A1
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WO
WIPO (PCT)
Prior art keywords
turntable
stage according
rollers
frame
bearings
Prior art date
Application number
PCT/FR1998/002001
Other languages
French (fr)
Inventor
Christophe Le Bobier
Jean-Christophe Mange
Jean-Philippe Chenu
Original Assignee
Moulinex S.A.
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 Moulinex S.A. filed Critical Moulinex S.A.
Publication of WO1999014987A1 publication Critical patent/WO1999014987A1/en

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6408—Supports or covers specially adapted for use in microwave heating apparatus
    • H05B6/6411—Supports or covers specially adapted for use in microwave heating apparatus the supports being rotated

Definitions

  • the present invention relates to a turntable plate intended to be removably mounted in an enclosure of a microwave oven, and comprising a support having two opposite sides adapted to come to rest on two opposite guides of the enclosure of the oven, means for guiding the turntable in rotation, as well as means for driving in rotation of said turntable about a vertical axis V.
  • Such a platinum has, for example, been described in French Patent Application No. 9510112 filed on August 25, 1995 by the Applicant.
  • This plate must not only be easy to handle to allow its installation in the enclosure or its extraction, but also, present contradictory parameters such as: robust structure to support the generally rotating turntable in glass as well as the food load which can go up to four kilograms, and openwork structure to let microwaves pass and obtain a good distribution of waves in the enclosure on both sides of the turntable, and to minimize reflections from to the microwave energy source.
  • the plate must be made of an electrically insulating material to avoid problems with an electric arc and, if necessary, comply with the legislation relating to materials brought into contact with foodstuffs.
  • the support comprises a frame having a rigid metal frame providing a central recess for housing the turntable and partially covered with a coating thus leaving the guiding and driving means and having at least the property of being electrically insulating.
  • this plate must be of a simple and inexpensive embodiment allowing mass production, while offering the user great convenience in mounting and dismounting with a view in particular to cleaning.
  • the means for guiding in rotation comprise several rollers of identical diameter arranged in planes transverse to the frame and having axes resting in bearings integral with the frame, while the turntable comprises a track which comes into engagement with the casters.
  • the bearings are made of nickel-plated and chromed steel, while the axes of the rollers are made of a plastic material.
  • Figure 1 is a top view in perspective of a turntable plate according to the invention with partial representation of the turntable;
  • Figure 2 is a vertical section along line II-II of Figure 1 with turntable and enlarged scale;
  • Figure 3 is a vertical section along the broken line III-III of Figure 1 without the turntable;
  • FIG. 4 is a section through a stripped support forming part of the plate along the line IV-IV of FIG. 1.
  • a turntable plate intended to be mounted in an enclosure of a microwave oven not shown.
  • the oven may be of the type described in French Patent Application No. 9510112 filed by the Applicant on August 25, 1995, and comprises at least two opposite guides formed on the side walls of the enclosure and intended for receiving the plate 1.
  • the plate 1 comprises a support 2 having two opposite sides 3, 4 adapted to come to rest on the two guides of the enclosure.
  • the support also rests on another side 5 on a guide located on the bottom wall of the enclosure.
  • the plate 1 further comprises means 6 for guiding the rotation of a turntable 7, as well as means 8 for driving in rotation of said turntable 7 around a vertical axis marked by broken lines and referenced by the letter V, this vertical axis being orthogonal to the plate.
  • the turntable 7 is made of a glassy material resistant to temperature. erased and transparent to microwave radiation, and has the general shape of a disc, the lower face 9 of which has a peripheral recess 10 intended to engage with the means 6 for guiding in rotation and comprising a horizontal track 11a parallel to the underside and a vertical and circular border 11b.
  • these means 6 comprise several casters, presently four in number, referenced 12 to 15, of identical diameter, arranged in planes transverse to the plate and having axes, represented in FIG. 1 by lines interrupted and referenced respectively from 16 to 19, resting in corresponding bearings of which one 20 is shown in Figures 1 and 3 and another 21 of which is shown in Figures 2 and 4., the other bearings cannot be seen in these drawings because each caster protrudes from a CP cover which covers the bearings.
  • the number of four casters is given on a preferential but non-limiting basis and makes it possible to optimize both the guiding and carrying functions of the turntable 7.
  • the support 2 comprises a frame 22 having a rigid metal frame providing a central recess 23 for housing the turntable 7 and partially covered with a coating 24 leaving the guide means 6 free and drive 8 and having at least the property of being electrically insulating.
  • the coating 24 is chosen from polymers resistant to high temperatures such as preferably a silicone.
  • This coating could also be Lely a polyp enylenesulfone (PPS) and preferably a RYTON (trademark registered by the company Phillips Petroleum). These coatings are also chosen for their food quality.
  • PPS polyp enylenesulfone
  • RYTON trademark registered by the company Phillips Petroleum
  • the silicone coating also provides thermal insulation, thus providing comfort in handling the plate.
  • openings are made, for example, in its angles, one of which 25 is illustrated in FIG. 2. This coating is for example produced by overmolding of the frame 22 while leaving free the guiding and driving means. .
  • the bearings are made of nickel-plated and chrome-plated steel, while the axes 16 to 19 of the rollers 12 to 15 are made of a plastic material.
  • each caster is molded in one piece with its axis.
  • PPS RYTON was chosen. This material offers, in addition to its resistance to wear, a good resistance to temperature, even at a high temperature close to 250 ° C. which can be raised in an enclosure with combined microwave-electric heating resistance.
  • the nickel-plated and chromed steel bearings advantageously constitute a smooth and extremely hard surface which minimizes friction and therefore the wear of the axes of the rollers.
  • tests carried out with stainless steel have proved disappointing over time, this being explained in particular by the poor coefficient of friction of this steel.
  • this nickel-plated and chromed steel allows a better diffusion of the friction heat and thus contributes to the reliability of the bearings - axes assembly.
  • the bearings namely 20, 21, are formed in one piece with the frame 22 which is for this purpose itself made of nickel-plated and chromed steel.
  • the frame and the bearings preferably come from a stamping part.
  • this frame has a general shape of flat bowl with hollowed out bottom and comprises an external edge 26, a descending edge 27 and a flange 28 (see figures 1 and 4).
  • the coating 24 covers well the edge 26, the openings 25 and the falling edge 27, but preferably leaves the flange 28 free.
  • the frame 22 is given a stiffening structure which not only ensures the support function of the turntable 7 and its load in operation, but also maintains perfect flatness of the flange 28.
  • This flatness is all the more necessary as the bearings are precisely arranged in this flange 28 and are each formed (FIG. 4) by a cradle 29 formed in the top of a boss 30 formed by stamping in said flange, said cradles having their bottoms located in the same plane which is itself parallel to the plane containing the collar.
  • the plan containing the funds is confused with the plane of the collar.
  • the four rollers 12 to 15 are arranged on the same circle, the center of which is situated on the vertical axis V, the axes 16 to 19 of said rollers each being oriented along a radius of said circle.
  • the turntable 7 comes to rest by its track 11a on the periphery of the rollers, while the vertical edge 11b comes into contact with the internal flanges of the rollers as can be seen in FIG. 2.
  • This arrangement of the rollers therefore ensures a cen - correct setting of the turntable while fulfilling the load carrying function of the turntable.
  • the means 8 for driving the rotary plate 7 in rotation comprise, as can be seen better in FIGS. 1 and 2, a driver 31 comprising a shaft 32 which is rotatably mounted on bearings 33, 34 carried by a console 35 secured to the frame, extending towards the inside of the recess 23, and arranged under said plate 7.
  • the shaft 32 is made of PPS and carries, between the bearings 33 and 34, a friction wheel 36 intended to come into engagement with the lower face 9 of the turntable 7.
  • This friction wheel is made of silicone which thus offers an optimized coefficient of friction with the glassy surface of the turntable.
  • the shaft 32 has at the wheel 36 a crenellated surface serving as an anchor in rotation for said wheel.
  • the friction wheel 36 is arranged substantially in a plane extending along a cord of the circle containing the rollers, the axis 16 of the roller 12 located upstream of the direction of rotation of the plate, currently arrow F, making an acute angle with the shaft 32 of the friction wheel 36.
  • this distance of the wheel 36 relative to the circle containing the rollers makes it possible to drive the rotary plate 7 on an area better protected against dirt likely to appear on the peripheral edge of said plate.
  • the contact surface shown diagrammatically at 38 of the wheel 36 with the turntable is located at a level higher than that of the respective contact surfaces of the two rollers (12 and 15) located on either side of the wheel (36) thus providing a short distance d.
  • This distance d is currently of the order of two millimeters.
  • the vertical border 11b therefore has a depth greater than the distance d and so as to guarantee the drive in rotation of the plate whether it is empty or under low load.
  • the shaft 32 has a free end 37 which projects from the frame to form a coupling head intended to come into engagement with a motorized drive (not shown tee) located, in a manner known per se, on the bottom wall of the oven enclosure, this coupling being effected when the plate 1 is correctly positioned in the enclosure.
  • a motorized drive not shown tee
  • the plate thus constituted satisfies the conditions of use in a microwave oven or in a microwave oven combined with heating by electrical resistance, and thanks to its widely added structure and therefore poorly reflective for microwaves. waves, it is well suited for heating food placed at two levels in the enclosure, one on the turntable and the other on the bottom of the lower turntable.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Ovens (AREA)

Abstract

The invention concerns a rotating tray (7) supporting plate (1) to be mounted removable in a microwave oven chamber, and comprising a support (2), means (6) for guiding said rotating tray (7) and means (8) for driving said tray in rotation. The invention is characterised in that the support (2) comprises a frame (22) with rigid metal reinforcement providing a central recess (23) for housing the rotating tray and partially covered with a coating (24) thereby leaving the guiding and driving means free and having at least the characteristic of being electrically insulating.

Description

PLATINE DE PLATEAU TOURNANT TURNTABLE PLATE
POUR POUR MICRO-ONDESFOR FOR MICROWAVE
La présente invention se rapporte à une platine de plateau tournant destinée à être montée de façon amovible dans une enceinte d'un four à micro-ondes, et comprenant un support ayant deux côtés opposés adaptés à venir reposer sur deux guides opposés de l'enceinte du four, des moyens de guidage en rotation du plateau tournant, ainsi que des moyens d'entraînement en rotation dudit plateau tournant autour d'un axe vertical V.The present invention relates to a turntable plate intended to be removably mounted in an enclosure of a microwave oven, and comprising a support having two opposite sides adapted to come to rest on two opposite guides of the enclosure of the oven, means for guiding the turntable in rotation, as well as means for driving in rotation of said turntable about a vertical axis V.
Une telle platine a, par exemple, été décrite dans la Demande de Brevet français n° 9510112 déposée le 25 août 1995 par la Demanderesse. Cette platine doit, non seulement, être facile à manipuler pour permettre sa mise en place dans l'enceinte ou son extraction, mais aussi, présenter des paramètres contradictoires tels que : structure robuste pour supporter le plateau tournant gé- neralement en verre ainsi que la charge alimentaire qui peut aller jusqu'à quatre kilogrammes, et structure ajourée pour laisser passer les micro-ondes et obtenir une bonne répartition des ondes dans l'enceinte de part et d'autre du plateau tournant, et pour minimiser les ré- flexions d'ondes vers la source d'énergie micro-ondes.Such a platinum has, for example, been described in French Patent Application No. 9510112 filed on August 25, 1995 by the Applicant. This plate must not only be easy to handle to allow its installation in the enclosure or its extraction, but also, present contradictory parameters such as: robust structure to support the generally rotating turntable in glass as well as the food load which can go up to four kilograms, and openwork structure to let microwaves pass and obtain a good distribution of waves in the enclosure on both sides of the turntable, and to minimize reflections from to the microwave energy source.
De plus, la platine doit être réalisée en un matériau isolant électrique pour éviter les problèmes d'arc électrique et si nécessaire être conforme à la législa- tion relative aux matières mises au contact des denrées alimentaires .In addition, the plate must be made of an electrically insulating material to avoid problems with an electric arc and, if necessary, comply with the legislation relating to materials brought into contact with foodstuffs.
Selon l'invention, le support comprend un cadre ayant une armature métallique rigide ménageant un évide- ment central de logement du plateau tournant et recouvert partiellement d'un revêtement laissant ainsi libre les moyens de guidage et d'entraînement et possédant au moins la propriété d'être isolant électrique.According to the invention, the support comprises a frame having a rigid metal frame providing a central recess for housing the turntable and partially covered with a coating thus leaving the guiding and driving means and having at least the property of being electrically insulating.
Ainsi, grâce au cadre métallique, on garantit une structure robuste peu influençable par la chaleur et résistante aux contraintes exercées par la charge du plateau tournant recevant les préparations alimentaires, et grâce au revêtement, on élimine notamment les problèmes liés aux arcs électriques.Thus, thanks to the metal frame, a robust structure is guaranteed that cannot be influenced by heat and is resistant to the stresses exerted by the load of the turntable receiving the food preparations, and thanks to the coating, the problems associated with electric arcs are eliminated in particular.
Par ailleurs, cette platine doit être d'une réalisation simple et peu coûteuse permettant une fabrication en grande série, tout en offrant à l'utilisateur une grande commodité de montage et démontage en vue notamment du nettoyage .Furthermore, this plate must be of a simple and inexpensive embodiment allowing mass production, while offering the user great convenience in mounting and dismounting with a view in particular to cleaning.
Selon une autre caractéristique importante de 1 ' invention, les moyens de guidage en rotation comprennent plusieurs roulettes de diamètre identique disposées dans des plans transversaux au cadre et ayant des axes reposant dans des paliers solidaires du cadre, tandis que le plateau tournant comprend une piste qui vient en prise avec les roulettes. Selon encore une autre caractéristique de l'invention, les paliers sont réalisés en acier nickelé et chromé, tandis que les axes des roulettes sont réalisés en un matériau plastique.According to another important characteristic of the invention, the means for guiding in rotation comprise several rollers of identical diameter arranged in planes transverse to the frame and having axes resting in bearings integral with the frame, while the turntable comprises a track which comes into engagement with the casters. According to yet another characteristic of the invention, the bearings are made of nickel-plated and chromed steel, while the axes of the rollers are made of a plastic material.
Ainsi, d'une part, on obtient un dispositif d'accouplement rapide et automatique entre le plateau tour- nant et le cadre qui lui-même comporte un minimum de pièces, et d'autre part, grâce aux paliers en acier nickelé et chromé supportant les axes des roulettes on obtient des tenues en résistance supérieures à mille heures sous charge de quatre kilogrammes.Thus, on the one hand, there is obtained a quick and automatic coupling device between the turntable and the frame which itself comprises a minimum of parts, and on the other hand, thanks to the nickel-plated and chromed steel bearings supporting the axes of the casters, resistance strengths greater than a thousand hours are obtained under a load of four kilograms.
Les caractéristiques et avantages de l'invention ressortiront de la description qui va suivre, prise à ti- tre d'exemple non limitatif, en référence aux dessins annexés dans lesquels : la figure 1 est une vue de dessus en perspective d'une platine de plateau tournant selon l'invention avec représentation partielle du plateau tournant ; la figure 2 est une section verticale selon la ligne II-II de la figure 1 avec plateau tournant et à échelle agrandie ; la figure 3 est une coupe verticale selon la ligne brisée III-III de la figure 1 sans le plateau tournant ; la figure 4 est une coupe d'un support dépouillé formant partie de la platine selon la ligne IV-IV de la figure 1.The characteristics and advantages of the invention will emerge from the description which follows, taken at short notice. tre non-limiting example, with reference to the accompanying drawings in which: Figure 1 is a top view in perspective of a turntable plate according to the invention with partial representation of the turntable; Figure 2 is a vertical section along line II-II of Figure 1 with turntable and enlarged scale; Figure 3 is a vertical section along the broken line III-III of Figure 1 without the turntable; FIG. 4 is a section through a stripped support forming part of the plate along the line IV-IV of FIG. 1.
Dans l'exemple de réalisation représenté à la figure 1, on a désigné en 1 une platine de plateau tournant destinée à être montée dans une enceinte d'un four à micro-ondes non représenté. A titre d'exemple, le four peut être du type décrit dans la Demande de Brevet français n° 9510112 déposée par la Demanderesse le 25 août 1995, et comprend au moins deux guides opposés ménagés sur les parois latérales de l'enceinte et destinées à recevoir la platine 1. La platine 1 comprend un support 2 ayant deux côtés opposés 3, 4 adaptés à venir reposer sur les deux guides de l'enceinte. Bien entendu, on pourrait également prévoir que le support repose également par un autre côté 5 sur un guide situé sur la paroi de fond de l'enceinte. La platine 1 comprend en outre des moyens 6 de guidage en rotation d'un plateau tournant 7, ainsi que des moyens 8 d'entraînement en rotation dudit plateau tournant 7 autour d'un axe vertical matérialisé par des traits interrompus et référencé par la lettre V, cet axe vertical étant orthogonal à la platine.In the embodiment shown in Figure 1, there is designated at 1 a turntable plate intended to be mounted in an enclosure of a microwave oven not shown. For example, the oven may be of the type described in French Patent Application No. 9510112 filed by the Applicant on August 25, 1995, and comprises at least two opposite guides formed on the side walls of the enclosure and intended for receiving the plate 1. The plate 1 comprises a support 2 having two opposite sides 3, 4 adapted to come to rest on the two guides of the enclosure. Of course, one could also provide that the support also rests on another side 5 on a guide located on the bottom wall of the enclosure. The plate 1 further comprises means 6 for guiding the rotation of a turntable 7, as well as means 8 for driving in rotation of said turntable 7 around a vertical axis marked by broken lines and referenced by the letter V, this vertical axis being orthogonal to the plate.
Dans l'exemple de réalisation illustré sur les figures et notamment sur la figure 2, le plateau tournant 7 est réalisé en un matériau vitreux résistant à la tempe- rature et transparent au rayonnement micro-ondes, et présente la forme générale d'un disque dont la face inférieure 9 présente un décrochement 10 périphérique destiné à venir en prise avec les moyens 6 de guidage en rotation et comportant une piste horizontale lia parallèle à la face inférieure et une bordure verticale et circulaire 11b.In the embodiment illustrated in the figures and in particular in Figure 2, the turntable 7 is made of a glassy material resistant to temperature. erased and transparent to microwave radiation, and has the general shape of a disc, the lower face 9 of which has a peripheral recess 10 intended to engage with the means 6 for guiding in rotation and comprising a horizontal track 11a parallel to the underside and a vertical and circular border 11b.
Comme on le voit, ces moyens 6 comprennent plu- sieurs roulettes, présentement au nombre de quatre, référencées 12 à 15, de diamètre identique, disposées dans des plans transversaux à la platine et ayant des axes, représentés à la figure 1 par des traits interrompus et référencés respectivement de 16 à 19, reposant dans des paliers correspondants dont un 20 est représenté aux figures 1 et 3 et dont un autre 21 est représenté aux figures 2 et 4. , les autres paliers ne pouvant être vus sur ces dessins car chaque roulette fait saillie d'un capot de propreté CP qui recouvre les paliers. Le nombre de quatre roulettes est donné à titre préférentiel mais non limitatif et permet d'optimiser à la fois les fonctions de guidage et de portage du plateau tournant 7.As can be seen, these means 6 comprise several casters, presently four in number, referenced 12 to 15, of identical diameter, arranged in planes transverse to the plate and having axes, represented in FIG. 1 by lines interrupted and referenced respectively from 16 to 19, resting in corresponding bearings of which one 20 is shown in Figures 1 and 3 and another 21 of which is shown in Figures 2 and 4., the other bearings cannot be seen in these drawings because each caster protrudes from a CP cover which covers the bearings. The number of four casters is given on a preferential but non-limiting basis and makes it possible to optimize both the guiding and carrying functions of the turntable 7.
Selon une caractéristique essentielle de 1 ' inven- tion, le support 2 comprend un cadre 22 ayant une armature métallique rigide ménageant un évidement central 23 de logement du plateau tournant 7 et recouvert partiellement d'un revêtement 24 laissant libre les moyens de guidage 6 et d'entraînement 8 et possédant au moins la pro- priété d'être isolant électrique.According to an essential characteristic of the invention, the support 2 comprises a frame 22 having a rigid metal frame providing a central recess 23 for housing the turntable 7 and partially covered with a coating 24 leaving the guide means 6 free and drive 8 and having at least the property of being electrically insulating.
De façon à satisfaire aux conditions de température régnant dans une enceinte à chauffage par micro-ondes et même à chauffage combiné micro-ondes - résistance chauf- fante électrique, le revêtement 24 est choisi dans les polymères résistant aux hautes températures tels que de préférence un silicone. Ce revêtement pourrait être éga- lement un polyp énylènesulfone (PPS) et de préférence un RYTON (marque déposée par la société Phillips Petroleum) . Ces revêtements sont également choisis pour leur qualité alimentaire. Comme on le voit bien sur la figure 1, l' évidement central 23 est délimité en grande partie par un cercle inscrit au cadre. Ainsi, la platine, de par la structure et la géométrie du cadre, allie les performances de rigidité et de transparence maximale au rayonnement micro- ondes ainsi que d'isolation électrique évitant toute formation d'arc électrique entre le cadre et les parois de l'enceinte. De plus, le revêtement en silicone procure également une isolation thermique donnant ainsi un confort de manipulation de la platine. Pour parfaire la transparence du cadre, on ménage, par exemple, dans ses angles des ajourages dont un 25 est illustré à la figure 2. Ce revêtement est par exemple réalisé par surmoulage du cadre 22 en laissant libre les moyens de guidage et d ' entraînement .In order to satisfy the temperature conditions prevailing in an enclosure with microwave heating and even with combined microwave heating - electric heating resistance, the coating 24 is chosen from polymers resistant to high temperatures such as preferably a silicone. This coating could also be Lely a polyp enylenesulfone (PPS) and preferably a RYTON (trademark registered by the company Phillips Petroleum). These coatings are also chosen for their food quality. As can be clearly seen in FIG. 1, the central recess 23 is largely delimited by a circle inscribed in the frame. Thus, by virtue of the structure and geometry of the frame, the plate combines the performances of maximum rigidity and transparency with microwave radiation as well as electrical insulation avoiding any formation of electric arc between the frame and the walls of the frame. 'pregnant. In addition, the silicone coating also provides thermal insulation, thus providing comfort in handling the plate. To improve the transparency of the frame, openings are made, for example, in its angles, one of which 25 is illustrated in FIG. 2. This coating is for example produced by overmolding of the frame 22 while leaving free the guiding and driving means. .
Selon une autre caractéristique importante de l'invention, les paliers sont réalisés en acier nickelé et chromé, tandis que les axes 16 à 19 des roulettes 12 à 15 sont réalisés en un matériau plastique. De préférence, chaque roulette est moulée d'une pièce avec son axe. De plus, pour obtenir la fiabilité des roulettes, même jusqu'à mille heures de fonctionnement, on a choisi comme matériau plastique le PPS RYTON. Ce matériau offre, outre sa résistance à l'usure, une bonne tenue à la tempéra- ture, même à une haute température voisine de 250° C qui peut être relevée dans une enceinte à chauffage combiné micro-ondes - résistance électrique.According to another important characteristic of the invention, the bearings are made of nickel-plated and chrome-plated steel, while the axes 16 to 19 of the rollers 12 to 15 are made of a plastic material. Preferably, each caster is molded in one piece with its axis. In addition, to obtain the reliability of the casters, even up to a thousand hours of operation, the plastic material PPS RYTON was chosen. This material offers, in addition to its resistance to wear, a good resistance to temperature, even at a high temperature close to 250 ° C. which can be raised in an enclosure with combined microwave-electric heating resistance.
Les paliers en acier nickelé et chromé constituent avantageusement une surface lisse et extrêmement dure qui minimise les frottements et donc l'usure des axes des roulettes. Par contre, des essais pratiqués avec de l'acier inoxydable se sont révélés décevants dans le temps, ceci s 'expliquant notamment par le mauvais coefficient de frottement de cet acier. D'autre part, cet acier nickelé et chromé permet une meilleure diffusion de la chaleur de friction et contribue ainsi à la fiabilité de l'ensemble paliers - axes.The nickel-plated and chromed steel bearings advantageously constitute a smooth and extremely hard surface which minimizes friction and therefore the wear of the axes of the rollers. On the other hand, tests carried out with stainless steel have proved disappointing over time, this being explained in particular by the poor coefficient of friction of this steel. On the other hand, this nickel-plated and chromed steel allows a better diffusion of the friction heat and thus contributes to the reliability of the bearings - axes assembly.
Comme le montrent mieux les figures 1 et 4 , les paliers, nommément 20, 21, sont formés d'une pièce avec le cadre 22 qui est à cet effet réalisé lui-même en acier nickelé et chromé . Pour une bonne rigidité et pour une fabrication économique, le cadre et les paliers sont de préférence venus d'une pièce d'emboutissage.As best shown in Figures 1 and 4, the bearings, namely 20, 21, are formed in one piece with the frame 22 which is for this purpose itself made of nickel-plated and chromed steel. For good rigidity and for economical manufacture, the frame and the bearings preferably come from a stamping part.
II convient de souligner que de manière à augmenter encore plus la rigidité du cadre 22 du support 2, ce cadre présente une forme générale de cuvette plate à fond évidé et comprend un bord externe 26, un bord descendant 27 et une collerette 28 (voir figures 1 et 4) . Le revête- ment 24 recouvre bien le bord 26, les ajourages 25 et le bord descendant 27, mais de préférence laisse libre la collerette 28.It should be emphasized that in order to further increase the rigidity of the frame 22 of the support 2, this frame has a general shape of flat bowl with hollowed out bottom and comprises an external edge 26, a descending edge 27 and a flange 28 (see figures 1 and 4). The coating 24 covers well the edge 26, the openings 25 and the falling edge 27, but preferably leaves the flange 28 free.
Grâce à cette réalisation, on confère au cadre 22 une structure de raidissement qui, non seulement, assure la fonction de support du plateau tournant 7 et de sa charge en fonctionnement, mais aussi maintient une pla- néité parfaite de la collerette 28.Thanks to this embodiment, the frame 22 is given a stiffening structure which not only ensures the support function of the turntable 7 and its load in operation, but also maintains perfect flatness of the flange 28.
Cette planéité est d'autant plus nécessaire que les paliers sont agencés précisément dans cette collerette 28 et sont formés chacun (figure 4) par un berceau 29 ménagé dans le sommet d'un bossage 30 pratiqué par emboutissage dans ladite collerette, lesdits berceaux ayant leurs fonds situés dans un même plan qui est lui-même parallèle au plan contenant la collerette. De préférence, le plan contenant les fonds est confondu avec le plan de la collerette.This flatness is all the more necessary as the bearings are precisely arranged in this flange 28 and are each formed (FIG. 4) by a cradle 29 formed in the top of a boss 30 formed by stamping in said flange, said cradles having their bottoms located in the same plane which is itself parallel to the plane containing the collar. Preferably, the plan containing the funds is confused with the plane of the collar.
Grâce à cette disposition, on garantit le respect d'une première chaîne de cotes entre collerette, paliers, axes des roulettes. Par ailleurs, les quatre roulettes 12 à 15 sont agencées sur un même cercle dont le centre est situé sur l'axe vertical V, les axes 16 à 19 desdites roulettes étant orientés chacun selon un rayon dudit cer- cle. Ainsi, le plateau tournant 7 vient reposer par sa piste lia sur la périphérie des roulettes, tandis que la bordure verticale 11b vient au contact des flasques internes des roulettes comme on le voit bien sur la figure 2. Cette disposition des roulettes assure donc un cen- trage correct du plateau tournant tout en remplissant la fonction de portage de la charge du plateau.Thanks to this arrangement, a first dimension chain between the flange, bearings, and the axes of the rollers is guaranteed. Furthermore, the four rollers 12 to 15 are arranged on the same circle, the center of which is situated on the vertical axis V, the axes 16 to 19 of said rollers each being oriented along a radius of said circle. Thus, the turntable 7 comes to rest by its track 11a on the periphery of the rollers, while the vertical edge 11b comes into contact with the internal flanges of the rollers as can be seen in FIG. 2. This arrangement of the rollers therefore ensures a cen - correct setting of the turntable while fulfilling the load carrying function of the turntable.
Selon encore une autre caractéristique importante de l'invention, les moyens 8 d'entraînement en rotation du plateau tournant 7 comportent, comme on le voit mieux sur les figures 1 et 2, un entraîneur 31 comprenant un arbre 32 qui est monté rotatif sur des paliers 33, 34 portés par une console 35 solidaire du cadre, s' étendant vers l'intérieur de l' évidement 23, et agencé sous ledit plateau 7. Dans une version préférentielle représentée sur les dessins, l'arbre 32 est réalisé en P. P. S. et porte, entre les paliers 33 et 34, une roue à friction 36 destinée à venir en prise avec la face inférieure 9 du plateau tournant 7. Cette roue à friction est réalisée en silicone qui offre ainsi un coefficient de friction optimisé avec la surface vitreuse du plateau tournant . Comme on le voit bien sur le figure 3, l'arbre 32 présente au niveau de la roue 36 une surface crénelée servant d'ancrage en rotation pour ladite roue.According to yet another important characteristic of the invention, the means 8 for driving the rotary plate 7 in rotation comprise, as can be seen better in FIGS. 1 and 2, a driver 31 comprising a shaft 32 which is rotatably mounted on bearings 33, 34 carried by a console 35 secured to the frame, extending towards the inside of the recess 23, and arranged under said plate 7. In a preferred version shown in the drawings, the shaft 32 is made of PPS and carries, between the bearings 33 and 34, a friction wheel 36 intended to come into engagement with the lower face 9 of the turntable 7. This friction wheel is made of silicone which thus offers an optimized coefficient of friction with the glassy surface of the turntable. As can be seen in Figure 3, the shaft 32 has at the wheel 36 a crenellated surface serving as an anchor in rotation for said wheel.
De manière à toujours assurer un bon entraînement en rotation du plateau tournant 7 quels que soient la charge appliquée et son positionnement plus ou moins centré sur la plateau tournant, la roue à friction 36 est agencée sensiblement dans un plan s 'étendant selon une corde du cercle contenant les roulettes, l'axe 16 de la roulette 12 située en amont du sens de rotation du plateau, présentement flèche F, faisant un angle aigu avec l'arbre 32 de la roue à friction 36. De plus, cet éloi- gnement de la roue 36 par rapport au cercle contenant les roulettes permet d'entraîner le plateau tournant 7 sur une zone mieux protégée contre les salissures susceptibles d'apparaître sur le bord périphérique dudit plateau.So as to always ensure a good rotational drive of the turntable 7 whatever the applied load and its positioning more or less centered on the turntable, the friction wheel 36 is arranged substantially in a plane extending along a cord of the circle containing the rollers, the axis 16 of the roller 12 located upstream of the direction of rotation of the plate, currently arrow F, making an acute angle with the shaft 32 of the friction wheel 36. In addition, this distance of the wheel 36 relative to the circle containing the rollers makes it possible to drive the rotary plate 7 on an area better protected against dirt likely to appear on the peripheral edge of said plate.
Pour favoriser l'entraînement du plateau 7 par la roue 36 notamment en présence de charge faible, la sur- face de contact schématisée en 38 de la roue 36 avec le plateau tournant est située à un niveau supérieur à celui des surfaces de contact respectives des deux roulettes (12 et 15) situées de part et d'autre de la roue (36) ménageant ainsi une faible distance d. Cette distance d est présentement de l'ordre de deux millimètres. La bordure verticale 11b possède donc une profondeur supérieure à la distance d et de manière à garantir l'entraînement en rotation du plateau qu'il soit à vide ou sous faible charge .To favor the drive of the plate 7 by the wheel 36, in particular in the presence of a low load, the contact surface shown diagrammatically at 38 of the wheel 36 with the turntable is located at a level higher than that of the respective contact surfaces of the two rollers (12 and 15) located on either side of the wheel (36) thus providing a short distance d. This distance d is currently of the order of two millimeters. The vertical border 11b therefore has a depth greater than the distance d and so as to guarantee the drive in rotation of the plate whether it is empty or under low load.
Ces caractéristiques d'agencement et de positionnement de la roue à friction 36 et de la roulette 12 permettent, d'une part, de transformer la force linéaire appliquée au plateau par la roue 36 en un mouvement de ro- tation, ladite roulette servant de butée et de guidage par la réaction de son flasque interne sur la bordure verticale 11b du plateau tournant.These characteristics of arrangement and positioning of the friction wheel 36 and of the caster 12 make it possible, on the one hand, to transform the linear force applied to the plate by the wheel 36 in a movement of rotation, said caster serving as stop and guide by the reaction of its internal flange on the vertical edge 11b of the turntable.
Pour assurer la mise en rotation de la roue 36, l'arbre 32 a une extrémité libre 37 qui fait saillie du cadre pour constituer une tête d'accouplement destinée à venir en prise avec un entraîneur motorisé (non représen- té) situé, de façon connue en soi, sur la paroi de fond de l'enceinte du four, cet accouplement s 'effectuant lorsque la platine 1 est correctement mise en place dans 1 'enceinte .To ensure the rotation of the wheel 36, the shaft 32 has a free end 37 which projects from the frame to form a coupling head intended to come into engagement with a motorized drive (not shown tee) located, in a manner known per se, on the bottom wall of the oven enclosure, this coupling being effected when the plate 1 is correctly positioned in the enclosure.
La platine ainsi constituée satisfait aux conditions d'utilisation dans un four à micro-ondes ou dans un four à micro-ondes combiné avec un chauffage par résistance électrique, et grâce à sa structure largement ajou- rée et donc faiblement reflectrice pour les micro-ondes, elle convient bien au chauffage des aliments placés à deux niveaux dans l'enceinte, les uns sur la platine et les autres sur la sole du plateau tournant inférieur.The plate thus constituted satisfies the conditions of use in a microwave oven or in a microwave oven combined with heating by electrical resistance, and thanks to its widely added structure and therefore poorly reflective for microwaves. waves, it is well suited for heating food placed at two levels in the enclosure, one on the turntable and the other on the bottom of the lower turntable.
En outre, grâce au respect de la chaîne de cote entre les roulettes, la roue de friction et le plateau tournant, on assure un entraînement efficace en rotation, que ce soit à faible charge par exemple inférieure à quatre kilogrammes, sur la roue à friction 36 et sur les deux roulettes 13 et 14 opposées à ladite roue, ou bien même à forte charge pour laquelle le plateau tournant 7 repose à la fois sur la roue 36 et de façon uniforme sur les quatre roulettes 12 à 15 grâce à la légère compression de la roue en silicone. Cette rotation du plateau tournant sous forte charge est permise par la structure rigide du cadre 22 et par le revêtement nickel-chrome des paliers des roulettes et de la roue à friction qui supprime pratiquement l'usure des axes en plastique de ces roulettes et de cette roue. In addition, thanks to the respect of the dimension chain between the rollers, the friction wheel and the turntable, an efficient rotational drive is ensured, whether at low load, for example less than four kilograms, on the friction wheel. 36 and on the two rollers 13 and 14 opposite said wheel, or even at high load for which the turntable 7 rests both on the wheel 36 and uniformly on the four rollers 12 to 15 thanks to the slight compression of the silicone wheel. This rotation of the turntable under high load is allowed by the rigid structure of the frame 22 and by the nickel-chrome coating of the bearings of the rollers and of the friction wheel which practically eliminates the wear of the plastic pins of these rollers and of this wheel.

Claims

REVENDICATIONS
1. Platine (1) de plateau tournant (7) destinée à être montée de façon amovible dans une enceinte d'un four à micro-ondes, et comprenant un support (2) ayant deux côtés opposés (3,4) adaptés à venir reposer sur deux guides opposés de l'enceinte du four, des moyens (6) de guidage en rotation du plateau tournant (7) ainsi que des moyens (8) d'entraînement en rotation dudit plateau tournant au- tour d'un axe vertical V caractérisée en ce que le support (2) comprend un cadre1. Turntable plate (1) (7) intended to be removably mounted in an enclosure of a microwave oven, and comprising a support (2) having two opposite sides (3,4) adapted to come rest on two opposite guides of the oven enclosure, means (6) for guiding the rotation of the turntable (7) as well as means (8) for driving in rotation of said turntable around a vertical axis V characterized in that the support (2) comprises a frame
(22) ayant une armature métallique rigide ménageant un évidement central (23) de logement du plateau tournant et recouvert partiellement d'un revêtement (24) laissant ainsi libre les moyens de guidage et d'entraînement et possédant au moins la propriété d'être isolant électrique .(22) having a rigid metal frame providing a central recess (23) for housing the turntable and partially covered with a coating (24) thus leaving the guide and drive means free and having at least the property of being electrical insulator.
2. Platine de plateau tournant selon la revendication 1, caractérisée en ce que le revêtement (24) est un polymère résistant aux hautes températures.2. Turntable stage according to claim 1, characterized in that the coating (24) is a polymer resistant to high temperatures.
3. Platine de plateau tournant selon la revendication 2, caractérisé en ce que le polymère est un silicone.3. Turntable stage according to claim 2, characterized in that the polymer is a silicone.
4. Platine de plateau tournant selon l'une quelconque des revendications 1 à 3, caractérisée en ce que les moyens (6) de guidage en rotation comprennent plusieurs roulettes (12 à 15) de diamè- tre identique, disposées dans des plans transversaux au cadre (22) et ayant des axes (16 à 19) reposant dans des paliers (20) solidaires du cadre, tandis que le plateau tournant (7) comprend une piste (lia) qui vient en prise avec les roulettes (12 à 15) .4. Turntable stage according to any one of claims 1 to 3, characterized in that the means (6) for guiding in rotation comprise several rollers (12 to 15) of identical diameter, arranged in planes transverse to the frame (22) and having axes (16 to 19) resting in bearings (20) integral with the frame, while the turntable (7) comprises a track (lia) which engages the rollers (12 to 15) .
5.Platine de plateau tournant selon la revendication 4, caractérisée en ce que les paliers (20) sont réalisés en acier nickelé et chromé, tandis que les axes (16 à 19) des roulettes (12 à 15) sont réalisés en un matériau plastique.5. turntable stage according to claim 4, characterized in that the bearings (20) are made of nickel-plated and chromed steel, while the axes (16 to 19) of the rollers (12 to 15) are made of a plastic material.
6. Platine de plateau tournant selon la revendication 5, caractérisée en ce que le matériau plastique des axes 16 à 19 est un polyphénylènesulfone (PPS) .6. Turntable stage according to claim 5, characterized in that the plastic material of axes 16 to 19 is a polyphenylenesulfone (PPS).
7. Platine de plateau tournant selon la revendication 5 ou 6, caractérisée en ce que les paliers (20) sont formés d'une pièce avec le cadre (22) qui est à cet effet réalisé en acier nickelé et chromé.7. Turntable stage according to claim 5 or 6, characterized in that the bearings (20) are formed in one piece with the frame (22) which is for this purpose made of nickel-plated and chromed steel.
8. Platine de plateau tournant selon la revendication 7, caractérisé en ce que le cadre (22) présente une forme générale de cuvette plate à fond évidé et comprend un bord externe (26) , un bord descendant (27) et une colle- rette (28) et les paliers des roulettes (12 à 15) sont agencés dans la collerette (28) et sont formés chacun par un berceau (29) ménagé dans le sommet d'un bossage (30) pratiqué par emboutissage dans ladite collerette, lesdits berceaux ayant leurs fonds situés dans un même plan qui est lui-même parallèle au plan contenant la collerette.8. Turntable stage according to claim 7, characterized in that the frame (22) has a general shape of flat bowl with hollowed out bottom and comprises an external edge (26), a descending edge (27) and a collar (28) and the bearings of the rollers (12 to 15) are arranged in the collar (28) and are each formed by a cradle (29) formed in the top of a boss (30) formed by stamping in said collar, said cradles with their bottoms located in the same plane which is itself parallel to the plane containing the collar.
9. Platine de plateau tournant selon l'une quelconque des revendications 4 à 8, caractérisée en ce que les roulettes (12 à 15) sont au nombre d'au moins quatre et sont agencées sur un même cercle dont le centre est sur l'axe vertical V, les axes (16 à 19) desdites roulettes étant orientés chacun selon un rayon dudit cercle. 9. Turntable stage according to any one of claims 4 to 8, characterized in that the rollers (12 to 15) are at least four in number and are arranged on the same circle whose center is on the vertical axis V, the axes (16 to 19) of said rollers each being oriented along a radius of said circle.
10. Platine de plateau tournant selon l'une quelconque des revendications 4 à 9, caractérisée en ce que les moyens (8) d'entraînement en rotation du plateau tournant (7) comportent un entraîneur (31) comprenant un arbre (32) qui est monté rotatif sur des paliers (33, 34) portés par une console (35) solidaire du cadre (22) et agencée sous le plateau tournant, et dont une extrémité libre (37) fait saillie dudit cadre ; ledit arbre (32) portant une roue à friction (36) des- tinée à venir en prise avec la face inférieure (9) du plateau tournant.10. Turntable stage according to any one of claims 4 to 9, characterized in that the means (8) for rotating the rotary table (7) comprise a driver (31) comprising a shaft (32) which is rotatably mounted on bearings (33, 34) carried by a console (35) integral with the frame (22) and arranged under the turntable, and of which a free end (37) projects from said frame; said shaft (32) carrying a friction wheel (36) intended to engage with the underside (9) of the turntable.
11. Platine de plateau tournant selon la revendication11. Turntable stage according to claim
10, caractérisée en ce que la roue à friction (36) est agencée sensiblement dans un plan s 'étendant selon une corde du cercle contenant les roulettes, l'axe (16) de la roulette (12) située en amont du sens de rotation du plateau (7) faisant un angle aigu α avec l'arbre (32) de la roue à friction (36) .10, characterized in that the friction wheel (36) is arranged substantially in a plane extending along a cord of the circle containing the rollers, the axis (16) of the roller (12) located upstream of the direction of rotation of the plate (7) making an acute angle α with the shaft (32) of the friction wheel (36).
12. Platine de plateau tournant selon la revendication 10 ou 11, caractérisée en ce que la roue à friction (36) est réali- sée en silicone, et la surface de contact de cette roue avec le plateau tournant (7) est située à un niveau supérieur à celui des surfaces de contact respectives des deux roulettes (12 et 15) situées de part et d'autre de la roue (36) ménageant ainsi une distance (d) .12. Turntable plate according to claim 10 or 11, characterized in that the friction wheel (36) is made of silicone, and the contact surface of this wheel with the turntable (7) is located at a level higher than that of the respective contact surfaces of the two rollers (12 and 15) located on either side of the wheel (36) thus providing a distance (d).
13. Platine de plateau tournant selon l'une quelconque des revendications 4 à 12, caractérisé en ce que le plateau tournant (7) présente la forme générale d'un disque dont la face inférieure (9) présente un décrochement (10) périphérique ménageant ainsi une bordure verticale et circulaire (11b) destinée à venir en prise respectivement avec les flasques internes des roulettes (12 à 15) , ainsi qu'une piste horizontale (lia) .13. Turntable stage according to any one of claims 4 to 12, characterized in that the turntable (7) has the general shape of a disc, the lower face (9) of which has a recess (10) which protects the device thus a vertical and circular border (11b) intended to engage respectively with the internal flanges casters (12 to 15), as well as a horizontal track (lia).
14 Platine de plateau tournant selon la revendication 12 et la revendication 13 , caractérisé en ce que la bordure verticale (11b) possède une profondeur supérieure à la distance (d) . 14 Turntable stage according to claim 12 and claim 13, characterized in that the vertical border (11b) has a depth greater than the distance (d).
PCT/FR1998/002001 1997-09-18 1998-09-17 Supporting plate for microwave rotating oven tray WO1999014987A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR97/12047 1997-09-18
FR9712047A FR2768494B1 (en) 1997-09-18 1997-09-18 ROTATING TRAY PLATE FOR MICROWAVE OVEN

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WO1999014987A1 true WO1999014987A1 (en) 1999-03-25

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8203107B2 (en) 2004-05-27 2012-06-19 Mastrad, S.A. Microwavable cooking implements and methods for crisping food items using the same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4210794A (en) * 1976-05-26 1980-07-01 Sharp Kabushiki Kaisha Turntable drive in a microwave oven
US4424431A (en) * 1982-01-04 1984-01-03 Whirlpool Corporation Turntable drive for a microwave oven
US4885446A (en) * 1988-03-16 1989-12-05 Liu Yiu C Load-responsive microwave oven turntable
US5463207A (en) * 1994-02-28 1995-10-31 Samsung Electronics Co., Ltd. Weight sensing apparatus of a microwave oven having a turntable
FR2738054A1 (en) * 1995-08-25 1997-02-28 Moulinex Sa ELECTRIC COOKING OVEN

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4210794A (en) * 1976-05-26 1980-07-01 Sharp Kabushiki Kaisha Turntable drive in a microwave oven
US4424431A (en) * 1982-01-04 1984-01-03 Whirlpool Corporation Turntable drive for a microwave oven
US4885446A (en) * 1988-03-16 1989-12-05 Liu Yiu C Load-responsive microwave oven turntable
US5463207A (en) * 1994-02-28 1995-10-31 Samsung Electronics Co., Ltd. Weight sensing apparatus of a microwave oven having a turntable
FR2738054A1 (en) * 1995-08-25 1997-02-28 Moulinex Sa ELECTRIC COOKING OVEN

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FR2768494A1 (en) 1999-03-19

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