EP0731624B1 - Heating device for waterbeds - Google Patents

Heating device for waterbeds Download PDF

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Publication number
EP0731624B1
EP0731624B1 EP96103374A EP96103374A EP0731624B1 EP 0731624 B1 EP0731624 B1 EP 0731624B1 EP 96103374 A EP96103374 A EP 96103374A EP 96103374 A EP96103374 A EP 96103374A EP 0731624 B1 EP0731624 B1 EP 0731624B1
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EP
European Patent Office
Prior art keywords
metal plate
heating device
conductors
ceramic plates
ceramic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96103374A
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German (de)
French (fr)
Other versions
EP0731624A3 (en
EP0731624A2 (en
Inventor
Willem Siebelink
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
VONTANA VERTRIEB GMBH & CO. KG
Vontana Industrie GmbH and Co KG
Original Assignee
Vontana Wasserbetten GmbH
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Publication date
Application filed by Vontana Wasserbetten GmbH filed Critical Vontana Wasserbetten GmbH
Publication of EP0731624A2 publication Critical patent/EP0731624A2/en
Publication of EP0731624A3 publication Critical patent/EP0731624A3/en
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Publication of EP0731624B1 publication Critical patent/EP0731624B1/en
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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C27/00—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas
    • A47C27/08—Fluid mattresses or cushions
    • A47C27/081—Fluid mattresses or cushions of pneumatic type
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C21/00—Attachments for beds, e.g. sheet holders, bed-cover holders; Ventilating, cooling or heating means in connection with bedsteads or mattresses
    • A47C21/04—Devices for ventilating, cooling or heating
    • A47C21/048—Devices for ventilating, cooling or heating for heating
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C27/00—Spring, stuffed or fluid mattresses or cushions specially adapted for chairs, beds or sofas
    • A47C27/08—Fluid mattresses or cushions
    • A47C27/085—Fluid mattresses or cushions of liquid type, e.g. filled with water or gel
    • 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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
    • H05B3/28—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor embedded in insulating material
    • H05B3/30—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor embedded in insulating material on or between metallic plates

Definitions

  • the invention relates to a heating device electrical resistance conductors for water beds, the between a bed frame and a safety film can be arranged and depending on the desired Temperature of one lying on the security film Water core is adjustable.
  • a heating device with electrical resistance conductors is known from document DE-A-4 102 880.
  • the Invention the object of a heating device to create for waterbeds of the type mentioned at the beginning, which is energy-saving under exclusion hotspots, heat build-up and plasticizer migration a significantly improved heat transfer with increased Security distinguishes.
  • the electrical conductors from one are advantageous pasty mixture of particles of precious metals, such as Gold, silver or ruthenium, as well as from ceramic Constituents, such as glass and aluminum oxides, which at about 900 ° C into the ceramic plates hybrid conductor loop is burned in.
  • the adhesive has poor electrical conductivity, however has a high adhesive strength and flexibility and consists of a special silicone mixture.
  • the number of required ceramic plates depends on their Size as well as the size of the to be heated Metal plate.
  • the symmetrical arrangement is therefor understand that each ceramic plate has its own Has heating area that flows so smoothly in the Heating area of an adjacent ceramic plate passes that in the stationary state of the heated Metal plate temperature differences on the top of the Metal plate are barely perceptible; or otherwise expressed, on top of the metal plate is just a very low ripple in heat transfer ascertain.
  • the PCB circuit board is located between the symmetrically arranged ceramic plates, so that a voltage tap on the shortest path between the branded electrical conductors of the ceramic plates and the printed conductors.
  • the current conductors of the circuit board are advantageous over one at one end at the bottom of the rigid Flexible cable attached to metal plate as well via a manually operated control device a standard mains plug with a standard one Power source connected. This leaves the previous one Ease of use received, and the flexible Line cable receives through its attachment to the Bottom of the rigid metal plate a solid Protection at its critical junction against the considerable and permanent, originating from the water core Pressure forces not only due to the water core static, but also dynamic when loaded can work.
  • both the heating device according to the invention as well as protecting the waterbed from damage is at the entrance of the cable into the electrical Printed circuit board provided a fuse that is too high Temperature, e.g. at over 70 ° C, at the bottom of the Metal plate or if the public voltage is too high Power supply the circuit between the cable and interrupts the current conductors of the circuit board.
  • NTC sensor Negative Temperature Coefficient Sensor
  • the rigid metal plate advantageously consists of an aluminum alloy with high thermal conductivity and the likewise rigid base plate made of a heat-resistant Plastic, such as ABS, polyurethane, polyamide or Polyethylene, e.g. Polytetrafluoroethylene.
  • a heat-resistant Plastic such as ABS, polyurethane, polyamide or Polyethylene, e.g. Polytetrafluoroethylene.
  • Heat transfer of the metal plate to the water core are both the rigid metal plate and the Base plate rounded at its corners and together form a very flat, plate-shaped Truncated cone without protruding areas. It is also possible the heater in a recess of the Arrange bed frame so that the surface of the Metal plate is aligned with the surrounding bed frame surface.
  • the new heating device 1 for a water bed 2 is between the bed frame 3 and one Security film 4 arranged and is dependent on the desired temperature of the on the security film 4 lying water core 5 by means of by hand actuating and outside of it Control device 6 adjustable.
  • the control device 6 is on the one hand via a flexible cable 7 with the Heating device 1 and on the other hand via a commercial power plug 8 with a standard Power source connectable in the form of a socket.
  • the water core 5 is covered by a sleeve 9 made of plastic enclosed and is covered by a cover 10 attacked.
  • Heating device 1 from a rigid metal plate 11 with high thermal conductivity, which with its underside 11a positively on a Base plate 12 poor thermal conductivity on the Bed frame 3 or in a recess provided therein is put on. From the surface 11b of the Metal plate 11 is the heat through the Security film 4 through and on through Transfer plastic sleeve 9 to the water core 5. By natural convection of the water core 5 in connection with induced water movement within the shell 9 Loading the water core 5, the water is heated.
  • Figures 4 to 6 are on the bottom 11a the metal plate 11 in a symmetrical arrangement overall six ceramic plates 13-18 in a symmetrical arrangement by means of an adhesive 19 (see FIG. 5) with high Thermal conductivity attached.
  • This adhesive 19 has poor electrical conductivity, but one high adhesive strength and flexibility and consists of one Silicone mixture.
  • Exactly between the two symmetrical Rows 13-15 and 16-18 of the ceramic plates 13-18 is on the bottom 11a of the metal plate 11 with a printed current conductors 21, 22 provided PCB circuit board 20 (Printed Circuit Board) glued on.
  • Each ceramic plate is branded with provided electrical conductors 23, which consist of a pasty Mixture of particles of precious metals, such as gold, silver or ruthenium, as well as from ceramic components, such as Glass and aluminum oxides are formed, which at about 900 ° C in the ceramic plates 13-18 to a hybrid Conductor loop is burned in.
  • the current conductors 21, 22 the circuit board 20 are at one end 24 at the Base 11a of the metal plate 11 attached flexible Line cable 7 via the control device 6 with a commercially available power plug 8 connected.
  • a fuse 25 is provided, which is too high Temperature, e.g.
  • the current conductors 21, 22 are the Printed circuit board 20 with a relay 28 in the form of a triac connected, which is also on the bottom 11a of the Metal plate 11 is attached and with the Control device 6 is connected.
  • NTC Negative Temperature Coefficient sensor
  • the rigid metal plate 11 is advantageously made of an aluminum alloy with high thermal conductivity and the likewise rigid base plate 12 from one heat-resistant plastic, such as ABS, polyurethane, polyamide or polyethylene with poor thermal conductivity.
  • one heat-resistant plastic such as ABS, polyurethane, polyamide or polyethylene with poor thermal conductivity.
  • Aluminum alloys are six to eight times higher Have a coefficient of thermal conductivity ⁇ than steels, they are special well suited for use as a heat transfer surface.
  • the base plate 12 has the function a rigid construction and one Thermal insulation too.
  • the base plate 12 advantageously at its the Underside 11a of the metal plate 11 facing surface 12a with a layer reflecting heat rays, e.g. a chrome or aluminum foil.
  • a layer reflecting heat rays e.g. a chrome or aluminum foil.
  • the base plate 12 on its surface side 12a at one end a recess 30 for performing the Line cable 7 and below each Ceramic plate 13-18 recesses 31 and the middle Recess 32 for the circuit board 20.
  • This Recesses 31, 32 are such that after positive fitting of the metal plate 11 on the Base plate 12 all heat-conducting metal and Ceramic parts 13-18; 20-23; 25-29 to surface 12a of the Base plate 12 has an air gap 33 (see FIG. 6) have at least 2 mm. Because air due to their poor thermal conductivity an excellent Thermal insulation is in this way with a simple measure a heat radiation of the Metal plate 11 with a facing away from the water core 5 and thus largely preventing
  • the heating device 1 With the heating device 1 according to the invention, it is possible to achieve a temperature between 29 ° C. and 40 ° C. on the top 11b of the metal plate 11, which temperature also corresponds approximately to the temperature on the bottom 11a of the metal plate 11.
  • the water core 5 can be heated to a skin temperature on the surface of the casing 9 from 27 ° C. to 36 ° C.
  • a temperature in the same range, namely between 27 ° C. and 36 ° C., is then also present on the underside of the base plate 12. Since the temperature on the underside of the base plate 12 is thus equal to the temperature on the surface of the casing 9, additional radiation losses due to an increased temperature difference, as in the case of the resistance wire heaters according to the prior art, are excluded.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Surface Heating Bodies (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
  • Resistance Heating (AREA)
  • Control Of Resistance Heating (AREA)
  • Thermotherapy And Cooling Therapy Devices (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Sorption Type Refrigeration Machines (AREA)
  • Central Heating Systems (AREA)

Abstract

A heating device for water beds comprises a plurality of electrical resistance conductors arranged between a bed frame and a safety foil, means for controlling the conductors in dependence on the desired temperature of a water core locatable under the safety foil, a plurality of ceramic plates arranged so that the conductors are burnt-in the ceramic plates, a bending resistant metal plate having a lower side, the ceramic plates being glued to the lower side of the metal plate by an adhesive having high thermal conductivity, and a base plate having poor thermal conductivity and placeable on the bed frame, the metal plate being arranged on the base plate in a form-locking manner with an air gap for the ceramic plates.

Description

Die Erfindung betrifft eine Heizungsvorrichtung mit elektrischen Widerstandsleitern für Wasserbetten, die zwischen einem Bettgestell und einer Sicherheitsfolie angeordnet werden kann und in Abhängigkeit von der gewünschten Temperatur eines auf der Sicherheitsfolie liegenden Wasserkerns regelbar ist.The invention relates to a heating device electrical resistance conductors for water beds, the between a bed frame and a safety film can be arranged and depending on the desired Temperature of one lying on the security film Water core is adjustable.

Eine Heizungsvorrichtung mit elektrischen Widerstandsleitern ist aus dem Dokument DE-A-4 102 880 bekannt.A heating device with electrical resistance conductors is known from document DE-A-4 102 880.

Bei einer durch offenkundige Benutzung bekannt gewordenen Heizungsvorrichtung dieser Art bestehen die Widerstandsleiter aus flexiblen, mit einer Kunststoffbeschichtung umgebenden metallischen Kabeln, die nach dem Prinzip eines Heizkissens geregelt werden. Diese Widerstandsheizungen sind mit dem Nachteil von Kriechspannungen behaftet, die durch die in den Raum zwischen dem elektrischen Leiter und dem einbettenden Kunststoff hineindiffundierenden Feuchtigkeit und Luft entstehen. Durch diese "Migrations" kann es zu "Hotspots" und damit zu örtlichen Überhitzungen und Wärmestaus kommen, die letztlich über eine erhöhte Energieausbeute zu einem Durchbrennen der Widerstandsleiter bei Altersermüdung führt. Da sich das Vinyl der Kunststoffummantelung der Widerstandsleiter nicht mit dem Vinyl der Sicherheitsfolie verträgt, kann dies zu Weichmacherwanderungen in der Sicherheitsfolie führen. Und schließlich sind diese Widerstandsleiter aufgrund ihres spulenähnlichen Heizwiderstandes mit entsprechenden elektromagnetischen Feldern verbunden.Known by public use become heating device of this type Resistor ladder made of flexible, with a Plastic coating surrounding metallic cables, which are regulated according to the principle of a heating pad. These resistance heaters have the disadvantage of Creep voltages afflicted by those in the room between the electrical conductor and the embedding Plastic diffusing moisture and air arise. These "migrations" can lead to "hotspots" and thus local overheating and heat build-up come that ultimately have an increased energy yield to burn out the resistance conductors Leads to aging fatigue. Since the vinyl of the Plastic sheathing of the resistance conductor not with the Vinyl can tolerate the security film, too Plasticizer migration in the security film. And finally, these resistance ladders are due their coil-like heating resistor with corresponding electromagnetic fields.

Von diesem Stand der Technik ausgehend, liegt der Erfindung die Aufgabe zugrunde, eine Heizungsvorrichtung für Wasserbetten der eingangs genannten Art zu schaffen, die sich in energiesparender Weise unter dem Ausschluß von Hotspots, Wärmestaus und Weichmacherwanderungen durch eine erheblich verbesserte Wärmeübertragung bei erhöhter Sicherheit auszeichnet.Based on this state of the art, the Invention, the object of a heating device to create for waterbeds of the type mentioned at the beginning, which is energy-saving under exclusion hotspots, heat build-up and plasticizer migration a significantly improved heat transfer with increased Security distinguishes.

Diese Aufgabe wird in Verbindung mit dem eingangs genannten Gattungsbegriff erfindungsgemäß dadurch gelöst, daß sie mit eingebrannten, elektrischen Leitern versehene Keramikplatten aufweist, die mit einem Klebstoff hoher Wärmeleitfähigkeit auf die Unterseite einer biegesteifen Metallplatte geklebt sind, die unter Freilassung eines Luftspaltes für die Keramikplatten formschlüssig auf eine Sockelplatte schlechter Wärmeleitfähigkeit aufgesetzt ist und auf dem Bettgestell aufsetzbar ist. Aufgrund der in die Keramikplatten eingebrannten elektrischen Leiter können keine Kriechspannungen mehr auftreten. Die Wärmeübertragung erfolgt nunmehr von den eingebrannten elektrischen Leitern auf die Keramikplatten, von diesen über den Klebstoff hoher Wärmeleitfähigkeit auf die Unterseite der biegesteifen Metallplatte und von deren Oberseite über die Sicherheitsfolie auf den Wasserkern. Da nunmehr die Sicherheitsfolie mit der Metallplatte kontaktiert, erfolgt in energiesparender Weise eine erheblich verbesserte Wärmeübertragung, da eine diese beeinträchtigende Kunststoffummantelung wie bei den Widerstandsdrahtheizungen fehlt. Auch Weichmacherwanderungen sind ausgeschlossen. Aufgrund der Biegesteifigkeit der Metallplatte befinden sich sämtliche Stromleiter in geschützter Anordnung zwischen der Unterseite der Metallplatte und der Sockelplatte. Da spulenähnliche Widerstände nicht vorhanden sind, können auch keine erwähnenswerten elektrischen Felder entstehen. Da nunmehr die elektrischen Leiter in die Keramikplatten eingebrannt sind und nicht wie bei den herkömmlichen Widerstandsheizungen von Kunststoff ummantelt sind, der eine um zwei Zehnerpotenzen schlechtere Wärmeleitzahl gegenüber Metallen aufweist, gewährleistet die erfindungsgemäße Heizungsvorrichtung eine wesentlich schnellere und wirtschaftlichere Aufheizung des Wasserkerns.This task is in conjunction with the beginning solved generic term according to the invention solved by that they are provided with burned-in electrical conductors Has ceramic plates with a high adhesive Thermal conductivity on the underside of a rigid Metal plate are glued, leaving one free Air gap for the ceramic plates positively on a Base plate of poor thermal conductivity is placed and on the Bed frame is attachable. Because of the in the Ceramic plates can be baked onto the electrical conductor no creeping stresses occur. The Heat transfer now takes place from the branded electrical conductors on the ceramic plates, of these on the adhesive with high thermal conductivity Underside of the rigid metal plate and its Top over the safety film on the water core. Now the security film with the metal plate contacted, takes place in an energy-saving manner significantly improved heat transfer because of this impairing plastic sheathing like the Resistance wire heaters are missing. Also Plasticizer migrations are excluded. Due to the All metal plates are rigid Current conductor in a protected arrangement between the Underside of the metal plate and the base plate. There coil-like resistors are not available also no electric fields worth mentioning arise. Now the electrical conductors in the ceramic plates are branded and not like the conventional ones Resistance heaters are encased in plastic, the a coefficient of thermal conductivity that is two powers of ten worse compared to metals, guarantees heating device according to the invention an essential faster and more economical heating of the Water core.

Vorteilhaft sind die elektrischen Leiter aus einem pastösen Gemisch aus Partikeln von Edelmetallen, wie Gold, Silber oder Ruthenium, sowie aus keramischen Bestandteilen, wie Glas und Aluminiumoxyden, gebildet, welches bei etwa 900 °C in die Keramikplatten zu einer hybriden Leiterschleife eingebrannt wird. Der Klebstoff weist eine schlechte elektrische Leitfähigkeit, jedoch eine hohe Klebekraft und Flexibilität auf und besteht aus einem speziellen Silikongemisch. Durch das hybride Gemisch der Leiter, welches sowohl metallische Leiterwerkstoffe als auch keramische Bestandteile der Sinterkeramik enthält, werden diese mittels eines Einbrennprozesses zu einem innigen wärmeleitenden Kontakt mit den Keramikplatten verbunden.The electrical conductors from one are advantageous pasty mixture of particles of precious metals, such as Gold, silver or ruthenium, as well as from ceramic Constituents, such as glass and aluminum oxides, which at about 900 ° C into the ceramic plates hybrid conductor loop is burned in. The adhesive has poor electrical conductivity, however has a high adhesive strength and flexibility and consists of a special silicone mixture. Through the hybrid Mixture of conductors, which is both metallic Conductor materials as well as ceramic components of the Sintered ceramic contains, these are by means of a Burning process to an intimate thermally conductive contact connected to the ceramic plates.

Nach einer besonders vorteilhaften Weiterbildung der Erfindung sind mehrere, die biegesteife Metallplatte gleichmäßig aufheizende Keramikplatten in symmetrischer Anordnung auf deren Unterseite geklebt und die elektrischen Leiter jeder Keramikplatte über flexible, elektrische, Silikon isolierte Drahtleiter mit einer zwischen den Keramikplatten angeordneten, mit gedruckten Stromleitern versehene PCB-Leiterplatte (Printed Circuit Board) in Parallelschaltung verbunden ist. Die Anzahl der erforderlichen Keramikplatten richtet sich nach ihrer Größe sowie nach der Größe der aufzuheizenden Metallplatte. Die symmetrische Anordnung ist dahingehend zu verstehen, daß jede Keramikplatte ihren eigenen Aufheizungsbereich aufweist, der derart fließend in den Aufheizungebereich einer benachbarten Keramikplatte übergeht, daß in stationärem Zustand der aufgeheizten Metallplatte Temperaturunterschiede auf der Oberseite der Metallplatte kaum noch wahrnehmbar sind; oder anders ausgedrückt, auf der Oberseite der Metallplatte ist nur eine sehr geringe Welligkeit der Wärmeübertragung festzustellen. Die PCB-Leiterplatte befindet sich zwischen den symmetrisch angeordneten Keramikplatten, so daß ein Spannungsabgriff auf kürzestem Wege zwischen den eingebrannten elektrischen Leitern der Keramikplatten und den gedruckten Stromleitern erfolgt.After a particularly advantageous development of Invention are several, the rigid metal plate evenly heating ceramic plates in symmetrical Arrangement glued to the bottom and the electrical conductor of each ceramic plate via flexible, electrical, silicone insulated wire conductors with a arranged between the ceramic plates, with printed Printed circuit board with printed conductors Board) is connected in parallel. The number of required ceramic plates depends on their Size as well as the size of the to be heated Metal plate. The symmetrical arrangement is therefor understand that each ceramic plate has its own Has heating area that flows so smoothly in the Heating area of an adjacent ceramic plate passes that in the stationary state of the heated Metal plate temperature differences on the top of the Metal plate are barely perceptible; or otherwise expressed, on top of the metal plate is just a very low ripple in heat transfer ascertain. The PCB circuit board is located between the symmetrically arranged ceramic plates, so that a voltage tap on the shortest path between the branded electrical conductors of the ceramic plates and the printed conductors.

Vorteilhaft sind die Stromleiter der Leiterplatte über ein an einem Ende an der Unterseite der biegesteifen Metallplatte befestigtes flexibles Leitungskabel sowie über eine von Hand zu betätigende Regeleinrichtung über einen handelsüblichen Netzstecker mit einer hausüblichen Spannungsquelle verbunden. Dadurch bleibt die bisherige Bedienungsfreundlichkeit erhalten, und das flexible Leitungskabel erhält durch seine Befestigung an der Unterseite der biegesteifen Metallplatte einen massiven Schutz an seiner kritischen Anschlußstelle gegenüber den erheblichen und ständigen, vom Wasserkern herrührenden Druckkräften, die aufgrund des Wasserkerns nicht nur statisch, sondern bei dessen Belastung auch dynamisch wirken können.The current conductors of the circuit board are advantageous over one at one end at the bottom of the rigid Flexible cable attached to metal plate as well via a manually operated control device a standard mains plug with a standard one Power source connected. This leaves the previous one Ease of use received, and the flexible Line cable receives through its attachment to the Bottom of the rigid metal plate a solid Protection at its critical junction against the considerable and permanent, originating from the water core Pressure forces not only due to the water core static, but also dynamic when loaded can work.

Um bei starken Spannungsschwankungen im öffentlichen Stromnetz sowohl die erfindungsgemäße Heizungsvorrichtung als auch das Wasserbett vor Beschädigungen zu schützen, ist am Eingang des Leitungskabels in die elektrische Leiterplatte eine Sicherung vorgesehen, die bei zu hoher Temperatur, z.B. bei über 70 °C, an der Unterseite der Metallplatte oder bei zu hoher Spannung des öffentlichen Stromnetzes den Stromkreis zwischen dem Leitungskabel und den Stromleitern der Leiterplatte unterbricht. In the event of strong voltage fluctuations in the public Power supply both the heating device according to the invention as well as protecting the waterbed from damage, is at the entrance of the cable into the electrical Printed circuit board provided a fuse that is too high Temperature, e.g. at over 70 ° C, at the bottom of the Metal plate or if the public voltage is too high Power supply the circuit between the cable and interrupts the current conductors of the circuit board.

Zu einer besonders wirtschaftlichen und energiesparenden Heizung trägt auch bei, daß die Stromleiter der Leiterplatte mit einem Relais in Form eines Triacs verbunden sind, welches gleichfalls an der Unterseite der Metallplatte befestigt ist und mit der Regeleinrichtung in Verbindung steht. Bislang sind derartige Relais bei den bekannten Heizungsvorrichtungen in der Regeleinrichtung angeordnet, die sich außerhalb des Wasserbettes in Handhabungsnähe des Benutzers befindet. Da von diesen Relais eine nicht unerhebliche Wärmeabstrahlung erfolgt, wird diese durch die Anordnung eines Triacs an der Unterseite der Metallplatte gleichfalls zur Beheizung des Wasserbettes ausgenutzt.To a particularly economical and Energy saving heating also helps that Current conductor of the circuit board with a relay in the form of a triac, which is also connected to the Bottom of the metal plate is attached and with the Control device is connected. So far such relays in the known heating devices arranged in the control device, which is outside of the waterbed in the vicinity of the user located. As a not insignificant of these relays Heat radiation occurs, this is due to the arrangement of a triac on the underside of the metal plate also used to heat the waterbed.

Ferner ist vorteilhaft an der Unterseite der biegesteifen Metallplatte ein NTC-Sensor (Negative Temperature Coefficient-Sensor) angeordnet, der gleichfalls mit der Regeleinrichtung verbunden ist. Dieser NTC-Sensor ist mit der Wirkung verknüpft, daß bei steigender Erhitzung sein Widerstand abnimmt. Dadurch wird eine sichere Regelung der Wärmeleistungsübertragung bei geringen Temperaturdifferenzen sichergestellt.It is also advantageous on the underside of the rigid metal plate an NTC sensor (Negative Temperature Coefficient Sensor) arranged the is also connected to the control device. This NTC sensor is linked to the effect that at increasing heating its resistance decreases. Thereby becomes a safe regulation of the heat transfer ensured at low temperature differences.

Die biegesteife Metallplatte besteht vorteilhaft aus einer Aluminiumlegierung hoher Wärmeleitfähigkeit und die gleichfalls biegesteife Sockelplatte aus einem warmfesten Kunststoff, wie ABS, Polyurethan, Polyamid oder Polyethylen, z.B. Polytetrafluorethylen. Zur Vermeidung von Abstrahlungsverlusten über die Sockelplatte ist diese vorteilhaft an ihrer der Unterseite der Metallplatte zugekehrten Fläche mit einer Wärmestrahlen reflektierenden Schicht versehen, z.B. in Form einer aufgedampften Chromierung oder einer aufgeklebten Aluminiumfolie.The rigid metal plate advantageously consists of an aluminum alloy with high thermal conductivity and the likewise rigid base plate made of a heat-resistant Plastic, such as ABS, polyurethane, polyamide or Polyethylene, e.g. Polytetrafluoroethylene. To avoid of radiation losses through the base plate is this advantageous at the bottom of the metal plate facing surface with a heat ray reflective layer, e.g. in form of a vapor-deposited chroming or a glued on Aluminum foil.

Zur Minimierung von Abstrahlungsverlusten trägt auch bei, wenn die Sockelplatte an einem Ende mit einer Aussparung zur Durchführung des elektrischen Leitungskabels und unterhalb einer jeden Keramikplatte sowie unterhalb der Leiterplatte mit Ausnehmungen für diese Teile mit einer Tiefe versehen ist, daß nach dem formschlüssigen Aufsetzen der Metallplatte sämtliche wärmeleitenden Metall- und Keramikteile zur Sockelplatte einen Luftspalt von mindestens 2 mm aufweisen.It also helps to minimize radiation losses at if the base plate at one end with a Recess to carry out the electrical Cable and below each ceramic plate and below the circuit board with recesses for these parts are provided with a depth that after positive positioning of the metal plate all heat-conducting metal and ceramic parts to the base plate have an air gap of at least 2 mm.

Zur Vermeidung von Beschädigungen der Sicherheitsfolie bei gleichzeitiger hervorragender Wärmeübertragung der Metallplatte auf den Wasserkern sind sowohl die biegesteife Metallplatte als auch die Sockelplatte an ihren Eckenbereichen abgerundet und bilden gemeinsam einen sehr flachen, plattenförmigen Kegelstumpf ohne vorspringende Bereiche. Es ist auch möglich, die Heizungsvorrichtung in einem Rücksprung des Bettgestells derart anzuordnen, daß die Oberfläche der Metallplatte zur umgebenden Bettgestellfläche fluchtet.To avoid damage to the Security film with excellent at the same time Heat transfer of the metal plate to the water core are both the rigid metal plate and the Base plate rounded at its corners and together form a very flat, plate-shaped Truncated cone without protruding areas. It is also possible the heater in a recess of the Arrange bed frame so that the surface of the Metal plate is aligned with the surrounding bed frame surface.

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt. Dabei zeigen:

  • Fig. 1 eine perspektivische Explosionsansicht auf ein Wasserbett mit einer zwischen dem Bettgestell und der Sicherheitsfolie angeordneten Heizungsvorrichtung,
  • Fig. 2 eine Querschnittsansicht durch ein Wasserbett mit einer zwischen Bettgestell und Sicherheitsfolie angeordneten Heizungsvorrichtung gemäß Fig. 1,
  • Fig. 3 eine perspektivische Explosionsansicht der aus Metallplatte, Sockelplatte und Regeleinrichtung bestehenden Heizungsvorrichtung,
  • Fig. 4 die Unteransicht der Metallplatte von Fig. 3,
  • Fig. 5 eine Schnittansicht entlang der Linie V-V von Fig. 3 und
  • Fig. 6 die Ansicht von Fig. 5 nach dem Aufsetzen der Metallplatte auf die Sockelplatte.
    • An embodiment of the invention is shown in the drawings. Show:
  • 1 is an exploded perspective view of a water bed with a heating device arranged between the bed frame and the security film,
  • 2 shows a cross-sectional view through a water bed with a heating device according to FIG. 1 arranged between the bed frame and the safety film,
  • 3 is an exploded perspective view of the heating device consisting of metal plate, base plate and control device,
  • 4 is the bottom view of the metal plate of FIG. 3,
  • Fig. 5 is a sectional view taken along the line VV of Fig. 3 and
  • Fig. 6 is the view of Fig. 5 after placing the metal plate on the base plate.

    • Die neue Heizungsvorrichtung 1 für ein Wasserbett 2 wird zwischen dem Bettgestell 3 und einer Sicherheitsfolie 4 angeordnet und ist in Abhängigkeit von der gewünschten Temperatur des auf der Sicherheitsfolie 4 liegenden Wasserkerns 5 mittels der per Hand zu betätigenden und außerhalb davon befindlichen Regeleinrichtung 6 regelbar. Die Regeleinrichtung 6 ist einerseits über ein flexibles Leitungskabel 7 mit der Heizungsvorrichtung 1 und andererseits über einen handelsüblichen Netzstecker 8 mit einer hausüblichen Spannungsquelle in Form einer Steckdose verbindbar.The new heating device 1 for a water bed 2 is between the bed frame 3 and one Security film 4 arranged and is dependent on the desired temperature of the on the security film 4 lying water core 5 by means of by hand actuating and outside of it Control device 6 adjustable. The control device 6 is on the one hand via a flexible cable 7 with the Heating device 1 and on the other hand via a commercial power plug 8 with a standard Power source connectable in the form of a socket.

    Wie aus den Figuren 1 und 2 entnommen werden kann, wird der Wasserkern 5 von einer Hülle 9 aus Kunststoff eingeschlossen und ist von einer Abdeckung 10 übergriffen.As can be seen from FIGS. 1 and 2, the water core 5 is covered by a sleeve 9 made of plastic enclosed and is covered by a cover 10 attacked.

    Gemäß den Figuren 3 bis 6 besteht die erfindungsgemäße Heizungsvorrichtung 1 aus einer biegesteifen Metallplatte 11 hoher Wärmeleitfähigkeit, die mit ihrer Unterseite 11a formschlüssig auf eine Sockelplatte 12 schlechter Wärmeleitfähigkeit auf dem Bettgestell 3 oder in eine darin vorgesehene Ausnehmung aufgesetzt ist. Von der Oberfläche 11b der Metallplatte 11 wird die Wärme durch die Sicherheitsfolie 4 hindurch sowie weiter durch die Kunststoffhülle 9 auf den Wasserkern 5 übertragen. Durch natürliche Konvektion des Wasserkerns 5 in Verbindung mit induzierten Wasserbewegungen innerhalb der Hülle 9 bei Belastung des Wasserkerns 5 wird das Wasser erwärmt.According to Figures 3 to 6 there is Heating device 1 according to the invention from a rigid metal plate 11 with high thermal conductivity, which with its underside 11a positively on a Base plate 12 poor thermal conductivity on the Bed frame 3 or in a recess provided therein is put on. From the surface 11b of the Metal plate 11 is the heat through the Security film 4 through and on through Transfer plastic sleeve 9 to the water core 5. By natural convection of the water core 5 in connection with induced water movement within the shell 9 Loading the water core 5, the water is heated.

    Gemäß den Figuren 4 bis 6 sind an der Unterseite 11a der Metallplatte 11 in symmetrischer Anordnung insgesamt sechs Keramikplatten 13-18 in symmetrischer Anordnung mittels eines Klebstoffes 19 (s. Fig. 5) mit hoher Wärmeleitfähigkeit befestigt. Dieser Klebstoff 19 besitzt eine schlechte elektrische Leitfähigkeit, jedoch eine hohe Klebekraft und Flexibilität und besteht aus einem Silikongemisch. Genau zwischen den beiden symmetrischen Reihen 13-15 und 16-18 der Keramikplatten 13-18 ist auf die Unterseite 11a der Metallplatte 11 eine mit gedruckten Stromleitern 21, 22 versehene PCB-Leiterplatte 20 (Printed Circuit Board) aufgeklebt.According to Figures 4 to 6 are on the bottom 11a the metal plate 11 in a symmetrical arrangement overall six ceramic plates 13-18 in a symmetrical arrangement by means of an adhesive 19 (see FIG. 5) with high Thermal conductivity attached. This adhesive 19 has poor electrical conductivity, but one high adhesive strength and flexibility and consists of one Silicone mixture. Exactly between the two symmetrical Rows 13-15 and 16-18 of the ceramic plates 13-18 is on the bottom 11a of the metal plate 11 with a printed current conductors 21, 22 provided PCB circuit board 20 (Printed Circuit Board) glued on.

    Jede Keramikplatte ist mit eingebrannten, elektrischen Leitern 23 versehen, die aus einem pastösen Gemisch aus Partikeln von Edelmetallen, wie Gold, Silber oder Ruthenium, sowie aus keramischen Bestandteilen, wie Glas und Aluminiumoxyden, gebildet sind, welches bei etwa 900 °C in die Keramikplatten 13-18 zu einer hybriden Leiterschleife eingebrannt ist. Die Stromleiter 21, 22 der Leiterplatte 20 sind über ein an einem Ende 24 an der Unterseite 11a der Metallplatte 11 befestigtes flexibles Leitungskabel 7 über die Regeleinrichtung 6 mit einem handelsüblichen Netzstecker 8 verbunden. Am Eingang des Leitungskabels 7 in die elektrische Leiterplatte 20 ist eine Sicherung 25 vorgesehen, die bei zu hoher Temperatur, z.B. bei 70 °C, an der Unterseite 11a der Metallplatte 11 oder bei zu hoher Spannung und damit zu hoher Stromaufnahme den Stromkreis zwischen dem Leitungskabel 7 und den Stromleitern 21, 22 der Leiterplatte 20 unterbricht. Dabei ist jeder elektrische Leiter 23 der Keramikplatten 13-18 über je einen flexiblen, elektrischen sowie Silikon isolierten Drahtleiter 26, 27 mit den gedruckten Stromleitern 21, 22 verbunden und sämtliche Leiter 23 in Parallelschaltung angeordnet.Each ceramic plate is branded with provided electrical conductors 23, which consist of a pasty Mixture of particles of precious metals, such as gold, silver or ruthenium, as well as from ceramic components, such as Glass and aluminum oxides are formed, which at about 900 ° C in the ceramic plates 13-18 to a hybrid Conductor loop is burned in. The current conductors 21, 22 the circuit board 20 are at one end 24 at the Base 11a of the metal plate 11 attached flexible Line cable 7 via the control device 6 with a commercially available power plug 8 connected. At the entrance of the Line cable 7 in the electrical circuit board 20 a fuse 25 is provided, which is too high Temperature, e.g. at 70 ° C, at the bottom 11a of the Metal plate 11 or if the voltage is too high and therefore too high current draw the circuit between the Line cable 7 and the current conductors 21, 22 of the Circuit board 20 interrupts. Everyone is electrical Head 23 of the ceramic plates 13-18 via one each flexible, electrical and silicone insulated Wire conductors 26, 27 with the printed current conductors 21, 22 connected and all conductors 23 in parallel arranged.

    Ferner sind die Stromleiter 21, 22 der Leiterplatte 20 mit einem Relais 28 in Form eines Triacs verbunden, welches gleichfalls an der Unterseite 11a der Metallplatte 11 befestigt ist und mit der Regeleinrichtung 6 in Verbindung steht.Furthermore, the current conductors 21, 22 are the Printed circuit board 20 with a relay 28 in the form of a triac connected, which is also on the bottom 11a of the Metal plate 11 is attached and with the Control device 6 is connected.

    Und schließlich ist an der Unterseite 11a der Metallplatte 11 ein NTC-Sensor (Negative Temperature Coefficient-Sensor) 29 angeordnet, der gleichfalls mit der Regeleinrichtung 6 in Verbindung steht. Durch die Hineinverlegung des Relais 28 in Form des Triacs sowie des NTC-Sensors 29 an die Unterseite der Metallplatte 11 werden diese wärmeabstrahlenden Regelteile gleichfalls in eleganter Weise zur Beheizung des Wasserbettes ausgenutzt, wodurch die Regeleinrichtung 6 lediglich noch die Funktion eines Schalters erfüllt, der mit keiner erwähnenswerten Wärmeabstrahlung mehr behaftet ist.And finally, at the bottom 11a Metal plate 11 an NTC (Negative Temperature Coefficient sensor) 29 arranged, which also with the control device 6 is connected. Through the Relay 28 in the form of the triac and of the NTC sensor 29 to the underside of the metal plate 11 these heat radiating control parts are also in elegant way to heat the waterbed exploited, whereby the control device 6 only fulfills the function of a switch with none heat radiation worth mentioning is more affected.

    Die biegesteife Metallplatte 11 besteht vorteilhaft aus einer Aluminiumlegierung hoher Wärmeleitfähigkeit und die gleichfalls biegesteife Sockelplatte 12 aus einem warmfesten Kunststoff, wie ABS, Polyurethan, Polyamid oder Polyethylen schlechter Wärmeleitfähigkeit. Da Aluminiumlegierungen eine sechs- bis achtmal höhere Wärmeleitzahl λ aufweisen als Stähle, sind sie besonders gut für den Einsatz als Wärmeübertragungsfläche geeignet.The rigid metal plate 11 is advantageously made of an aluminum alloy with high thermal conductivity and the likewise rigid base plate 12 from one heat-resistant plastic, such as ABS, polyurethane, polyamide or polyethylene with poor thermal conductivity. There Aluminum alloys are six to eight times higher Have a coefficient of thermal conductivity λ than steels, they are special well suited for use as a heat transfer surface.

    Demgegenüber kommt der Sockelplatte 12 die Funktion einer biegesteifen Tragkonstruktion sowie eines Wärmedämmers zu. Um den Vektor der Wärmeübertragung gezielt in Richtung auf den Wasserkern 5 zu lenken, ist die Sockelplatte 12 vorteilhaft an ihrer der Unterseite 11a der Metallplatte 11 zugekehrten Fläche 12a mit einer Wärmestrahlen reflektierenden Schicht, z.B. einer Chromierung oder Aluminiumfolie, versehen. Außerdem weist die Sockelplatte 12 an ihrer Oberflächenseite 12a an einem Ende eine Aussparung 30 zur Durchführung des Leitungskabels 7 und unterhalb einer jeden Keramikplatte 13-18 Ausnehmungen 31 sowie die mittige Ausnehmung 32 für die Leiterplatte 20 auf. Diese Ausnehmungen 31, 32 sind so beschaffen, daß nach dem formschlüssigen Aufsetzen der Metallplatte 11 auf die Sockelplatte 12 sämtliche wärmeleitenden Metall- und Keramikteile 13-18; 20-23; 25-29 zur Oberfläche 12a der Sockelplatte 12 einen Luftspalt 33 (s. Fig. 6) von mindestens 2 mm aufweisen. Da Luft aufgrund ihrer schlechten Wärmeleitfähigkeit eine hervorragende Wärmedämmung darstellt, wird auf diese Weise mit einer einfachen Maßnahme eine Wärmeabstrahlung der Metallplatte 11 mit einer vom Wasserkern 5 abgewandte und somit unerwünschte Richtung weitgehend unterbunden. In contrast, the base plate 12 has the function a rigid construction and one Thermal insulation too. To the vector of heat transfer to steer specifically towards the water core 5 the base plate 12 advantageously at its the Underside 11a of the metal plate 11 facing surface 12a with a layer reflecting heat rays, e.g. a chrome or aluminum foil. Moreover has the base plate 12 on its surface side 12a at one end a recess 30 for performing the Line cable 7 and below each Ceramic plate 13-18 recesses 31 and the middle Recess 32 for the circuit board 20. This Recesses 31, 32 are such that after positive fitting of the metal plate 11 on the Base plate 12 all heat-conducting metal and Ceramic parts 13-18; 20-23; 25-29 to surface 12a of the Base plate 12 has an air gap 33 (see FIG. 6) have at least 2 mm. Because air due to their poor thermal conductivity an excellent Thermal insulation is in this way with a simple measure a heat radiation of the Metal plate 11 with a facing away from the water core 5 and thus largely preventing unwanted direction.

    Wie am anschaulichsten aus Fig. 6 entnommen werden kann, sind sowohl die biegesteife Metallplatte 11 als auch die Sockelplatte 12 an ihren Eckenbereichen abgerundet und bilden gemeinsam einen sehr flachen, plattenförmigen Kegelstumpf ohne jede Vorsprünge, der sich auch in eine flache Ausnehmung der Bettauflagerfläche 3a derart einsetzen läßt, daß die Oberfläche 11b der Metallplatte 11 zur Bettauflagerfläche 3a fluchtet.As can be seen most clearly from FIG. 6 can, both the rigid metal plate 11 and also the base plate 12 at its corner areas rounded and together form a very flat, plate-shaped truncated cone without any projections, the also in a shallow recess Bed support surface 3a can be used so that the Surface 11b of the metal plate 11 for Bed support surface 3a is aligned.

    Mit der erfindungsgemäßen Heizungsvorrichtung 1 ist es möglich, auf der Oberseite 11b der Metallplatte 11 eine Temperatur zwischen 29 °C und 40 °C zu erzielen, die etwa auch der Temperatur an der Unterseite 11a der Metallplatte 11 entspricht. Mit diesem Temperaturbereich kann der Wasserkern 5 auf eine Hauttemperatur an der Oberfläche der Hülle 9 von 27 °C bis 36 °C aufgeheizt werden. An der Unterseite der Sockelplatte 12 ist dann gleichfalls eine Temperatur in demselben Bereich, nämlich zwischen 27 °C und 36 °C, vorhanden. Da somit die Temperatur an der Unterseite der Sockelplatte 12 gleich der Temperatur an der Oberfläche der Hülle 9 ist, werden zusätzliche Abstrahlungsverluste aufgrund einer erhöhten Temperaturdifferenz, wie bei den Widerstandsdrahtheizungen gemäß dem Stand der Technik, ausgeschlossen. Bezugszeichenliste: Heizungsvorrichtung 1 Wasserbett 2 Bettgestell 3 Bettauflagerfläche 3a Sicherheitsfolie 4 Wasserkern 5 Regeleinrichtung 6 Leitungskabel 7 Netzstecker 8 Hülle 9 Abdeckung 10 Metallplatte 11 Unterseite der Metallplatte 11 11a Oberfläche der Metallplatte 11 11b Sockelplatte 12 Oberflächenseite der Sockelplatte 12 12a Keramikplatten 13-18 Klebstoff 19 PCB-Leiterplatte 20 Stromleiter 21, 22 Widerstandsleiter 23 Ende der Metallplatte 11 24 Sicherung 25 Drahtleiter 26, 27 Relais, Triac 28 NTC-Sensor 29 Aussparung 30 Ausnehmungen 31, 32 Luftspalt 33 With the heating device 1 according to the invention, it is possible to achieve a temperature between 29 ° C. and 40 ° C. on the top 11b of the metal plate 11, which temperature also corresponds approximately to the temperature on the bottom 11a of the metal plate 11. With this temperature range, the water core 5 can be heated to a skin temperature on the surface of the casing 9 from 27 ° C. to 36 ° C. A temperature in the same range, namely between 27 ° C. and 36 ° C., is then also present on the underside of the base plate 12. Since the temperature on the underside of the base plate 12 is thus equal to the temperature on the surface of the casing 9, additional radiation losses due to an increased temperature difference, as in the case of the resistance wire heaters according to the prior art, are excluded. Reference symbol list: Heater 1 Waterbed 2nd Bed frame 3rd Bed support area 3a Security film 4th Water core 5 Control device 6 Cable 7 Power plug 8th Cover 9 cover 10th Metal plate 11 Underside of the metal plate 11 11a Surface of the metal plate 11 11b Base plate 12th Surface side of the base plate 12 12a Ceramic plates 13-18 adhesive 19th PCB circuit board 20th Conductor 21, 22 Resistance ladder 23 End of the metal plate 11 24th Fuse 25th Wire conductor 26, 27 Relay, triac 28 NTC sensor 29 Recess 30th Recesses 31, 32 Air gap 33

    Claims (12)

    1. A heating device (1) with electric resistance conductors for waterbeds (2), said conductors being arranged between a bedframe (3) and a safety sheet and being regulated as a function of the desired temperature of a water core (5) resting on the safety sheet (4), characterized in that it has enameled ceramic plates (13 - 18) which are provided with electric conductors (23) and are glued to the lower side (11a) of a flexurally rigid metal plate (11) with an adhesive (19) having a high thermal conductivity, said metal plate being placed in a form-fitting manner on a base plate (12) having a poor thermal conductivity, leaving an air gap (33) free for the ceramic plates (13 - 18) and said metal plate being placeable on the bedframe (3).
    2. A heating device according to Claim 1, characterized in that the electric conductor (23) is made of a pasty mixture of particles of noble metals such as gold, silver or ruthenium and from ceramic components such as glass and aluminum oxides, said mixture being fired at approximately 900 °C in the ceramic plates (13 - 18) to form a hybrid conductor loop.
    3. A heating device according to Claim 1 or 2, characterized in that the adhesive (19) has a poor electric conductivity, a high adhesive power and flexibility and consists of a silicone mixture.
    4. A heating device according to one of Claims 1 through 3, characterized in that several ceramic plates (13 - 18) which heat the flexurally rigid metal plate (11) uniformly are glued to the lower side (11a) of the ceramic plates in a symmetrical arrangement, and the electric conductors (23) of each ceramic plate (13 - 18) are connected in a parallel circuit by flexible electric wire conductors (26, 27) insulated with silicone to a PCB (20) provided with printed current conductors arranged between ceramic plates (13 - 18).
    5. A heating device according to one of Claims 1 through 4, characterized in that the current conductors (21, 22) of the circuit board (20) can be connected to a conventional voltage source by a conventional power plug (8) by way of a flexible cable line (7) attached at one end (24) to the lower side (11a) of the flexurally rigid metal plate (11) and by a manually operated control device (6).
    6. A heating device according to one of Claims 1 through 5, characterized in that a fuse (25) is provided at the point of entry of the cable line (7) into the electric circuit board (20) to interrupt the electric circuit (7, 21, 22, 23, 26, 27) between the cable line (7) and the current conductors (21, 22) of the circuit board (20) whenever the temperature of the lower side (lla) of the metal plate (11) becomes too high or the voltage is too high.
    7. A heating device according to one of Claims 1 through 6, characterized in that the current conductors (21, 22) of the circuit board (20) are connected to a relay in the form of a bidirectional triode thyristor (28) which is also attached to the lower side (11a) of the metal plate (11) and is connected to the control device (6).
    8. A heating device according to one of Claims 1 through 7, characterized in that an NTC sensor (29) is arranged on the lower side (11a) of the flexurally rigid metal plate (11) and is also connected to the control device (6).
    9. A heating device according to one of Claims 1 through 8, characterized in that the flexurally rigid metal plate (11) consists of an aluminum alloy having a high thermal conductivity, and the base plate (12) which is also designed to be flexurally rigid is made of a thermally stable plastic such as ABS, polyurethane, polyamide or polyethylene which has a poor thermal conductivity.
    10. A heating device according to one of Claims 1 through 9, characterized in that on one end, the base plate (12) is provided with a recess (30) for the electric cable line (7) to pass through, and below each ceramic plate (13 - 18) and below the circuit board (20) it is provided with recesses (31, 32) for these parts with a depth such that after form-fitting placement of the metal plate (11), all the thermally conducting metal and ceramic parts (13 - 18; 21 - 23; 25 - 29) have an air gap (33) of at least 2 mm relative to the base plate (12).
    11. A heating device according to one of Claims 1 through 10, characterized in that the base plate (12) is provided with a layer that reflects heat rays on its surface (12a) facing the lower side (11a) of the metal plate (11).
    12. A heating device according to one of Claims 1 through 11, characterized in that both the flexurally rigid metal plate (11) as well as the base plate (12) are rounded in their corner areas and together form a very flat plate-shaped truncated cone without any projecting areas.
    EP96103374A 1995-03-09 1996-03-05 Heating device for waterbeds Expired - Lifetime EP0731624B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19508315 1995-03-09
    DE19508315A DE19508315C1 (en) 1995-03-09 1995-03-09 Heating unit for water beds

    Publications (3)

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    EP0731624A2 EP0731624A2 (en) 1996-09-11
    EP0731624A3 EP0731624A3 (en) 1996-12-11
    EP0731624B1 true EP0731624B1 (en) 2000-01-19

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    US (1) US5811760A (en)
    EP (1) EP0731624B1 (en)
    AT (1) ATE189095T1 (en)
    CA (1) CA2171410A1 (en)
    DE (1) DE19508315C1 (en)
    NL (1) NL1002575C2 (en)

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    Publication number Publication date
    ATE189095T1 (en) 2000-02-15
    CA2171410A1 (en) 1996-09-10
    EP0731624A3 (en) 1996-12-11
    DE19508315C1 (en) 1996-05-09
    NL1002575A1 (en) 1996-09-11
    EP0731624A2 (en) 1996-09-11
    NL1002575C2 (en) 1998-04-07
    US5811760A (en) 1998-09-22

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