EP1589289B1 - Pull-out system for household appliance - Google Patents
Pull-out system for household appliance Download PDFInfo
- Publication number
- EP1589289B1 EP1589289B1 EP05103122.7A EP05103122A EP1589289B1 EP 1589289 B1 EP1589289 B1 EP 1589289B1 EP 05103122 A EP05103122 A EP 05103122A EP 1589289 B1 EP1589289 B1 EP 1589289B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pull
- rail
- out system
- lubricant
- lubricant coating
- 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.)
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- 239000000314 lubricant Substances 0.000 claims description 94
- 238000000576 coating method Methods 0.000 claims description 28
- 239000011248 coating agent Substances 0.000 claims description 25
- 238000010411 cooking Methods 0.000 claims description 24
- 238000005096 rolling process Methods 0.000 claims description 14
- 239000011230 binding agent Substances 0.000 claims description 9
- 229910003480 inorganic solid Inorganic materials 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- 239000003973 paint Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 229910052582 BN Inorganic materials 0.000 claims description 3
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 3
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims description 3
- ITRNXVSDJBHYNJ-UHFFFAOYSA-N tungsten disulfide Chemical compound S=[W]=S ITRNXVSDJBHYNJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 2
- 239000000945 filler Substances 0.000 claims description 2
- 230000000717 retained effect Effects 0.000 claims 1
- 238000005299 abrasion Methods 0.000 description 7
- 238000011109 contamination Methods 0.000 description 7
- 239000007787 solid Substances 0.000 description 7
- 238000000605 extraction Methods 0.000 description 6
- 230000001050 lubricating effect Effects 0.000 description 4
- 238000005461 lubrication Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000000197 pyrolysis Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000004049 embossing Methods 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 239000004922 lacquer Substances 0.000 description 2
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 2
- 238000005240 physical vapour deposition Methods 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 238000004851 dishwashing Methods 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/16—Shelves, racks or trays inside ovens; Supports therefor
- F24C15/168—Shelves, racks or trays inside ovens; Supports therefor with telescopic rail systems
Definitions
- the invention relates to an extension system for a household appliance, in particular cooking appliance having at least one stationary holding rail and a movable pull-out rail for holding a food support, of which at least a first rail is coated with a first layer having a lubricant.
- a generic pull-out system which has a stationary inner rail, a movable intermediate rail and a movable outer rail.
- the rails are provided with an easy-to-clean PTFE-based coating.
- different coating qualities are provided.
- component areas that point downwards can be equipped with a lower coating quality with regard to cleanability and / or abrasion resistance than component areas facing upwards, which are exposed directly to product spills.
- a telescopic insertion device which is designed as a telescopic extension with a stationary inner rail, a rollable middle rail and a rollable outer rail for the food support.
- two rollers are each mounted by bolts.
- the bolt grooves are formed, which serve to accommodate high-temperature-resistant grease or lubricating paste.
- a rail extension for horizontal or vertical extension of an element is known, with at least one outer rail of bent sheet metal and a partially encompassing and slidably guided on this by a rolling bearing guided slide made of bent sheet metal, having a connected to the outer rail and this stiffening additional outer rail and / or one associated with the slide and this stiffening additional rail.
- a pull-out device in particular telescopic pull-out device, is known for at least one food support in a cooking chamber of a cooking oven, with rails guided in or on guides by means of ball bearings or roller bearings and at least partially extractable from the cooking chamber, on or to which at least one food support can be placed or fastened, wherein the balls of the ball bearings or the rollers of the roller bearings consist at least on their surface of a self-lubricating material.
- the object of the invention is to provide a drawer system for a household appliance, which permanently has good running or sliding properties.
- the rails different surface properties.
- the running or sliding behavior of the extension system can be significantly increased.
- the running or sliding behavior improves in particular when the rails are coated with layers of different surface hardness.
- the lubricant is an inorganic solid lubricant.
- Such a lubricant in contrast to many other lubricants, such as liquid lubricants of oil or fat, even at high temperatures physiologically harmless.
- the lubricant is chemically resistant, in particular alkali-resistant, to enable cleaning in a dishwasher.
- the extraction system can also be exposed to chemically aggressive media, for example alkalis in a dishwashing machine.
- Inorganic solid lubricants are particularly easy to detach from a layer structure. Distributing the inorganic solid lubricant to components that are not coated with the solid lubricant is therefore particularly easy. Squeaking noises or a stiffness of the extension system are therefore reliably prevented.
- the lubricant is resistant to high temperatures.
- all lubricants come into question, which are up to maximum cooking temperatures of up to 300 ° C and optionally up to 500 ° to 600 ° C in the pyrolysis resistant.
- graphite is used as the solid lubricant.
- Graphite can be used even at very high temperatures as well as chemically resistant and cost-effective.
- Molybdenum disulfide can be used as a solid lubricant. In this case, however, it may become problematic at very high temperatures because of the generation of S 2 . If the manufacturing costs are only of secondary importance, as a solid lubricant and boron nitride is conceivable that is resistant and physiologically harmless in all temperature ranges. The same applies to tungsten disulfide.
- the lubricant layer has a binder that holds the lubricant to the rail.
- the binder provides improved bonding of the lubricant to the rail surface.
- such a connection does not exist if the lubricant only finds support in a roughened rail surface.
- the lubricant is suspended in the paint.
- the lubrication of the extraction system can be achieved via a lubricant layer provided only on the intermediate rail.
- Other components in the extension system such as rails, rolling elements or Wälz stressesurafige must therefore take no lubricating function.
- the rolling elements and / or their Wälz stressesurafige can therefore be specially designed as limit stops. This occurring loads could not withstand, for example on carbon-based Wälz stressesurafige (so-called. PEEK cages).
- the intermediate rail is completely coated with the lubricant. Compared to a partial coating of the intermediate rail thus the coating process can be significantly simplified.
- a lowermost layer layer may have a large proportion of binders and correspondingly less solid lubricant.
- an abrasion-resistant mounting of the lubricant is secured to the rail.
- an uppermost layer can have little binder and, for that, a high proportion of solid lubricant. As a result, the lubricating property of the intermediate rail is increased.
- the lubricant-containing layer may contain further fillers, such as ceramic, to adjust its layer quality or abrasion resistance.
- the extension system may be removably mounted in the cooking appliance.
- a simple cleaning of the pull-out system outside of the cooking appliance is achieved.
- the extraction system can be removed so as not to expose it to high temperatures in pyrolysis operation.
- the extraction system can be designed such that the coated with the lubricant layer rail is protected from contamination.
- the holding rail and / or the pull-out rail define a cavity in which the intermediate layer coated with the lubricant layer is arranged.
- the intermediate rail is inserted at least in the cooking mode in the cavity formed by the retaining rail / pull-out rail. A contamination of the intermediate rail by cooking liquid or by vapors is thereby substantially reduced.
- the lubricant layer has an inorganic solid lubricant.
- Such a lubricant layer has excellent lubricating properties, but is difficult to clean. This is due to the physical properties of inorganic solid lubricants. The poor cleanability, however, plays only a minor role, if the, the lubricant layer having rail is largely protected from contamination.
- FIG. 1 In the FIG. 1 is shown in the first embodiment, a cooking appliance with a cooking appliance muffle 1, which limits a cooking chamber.
- the cooking appliance has a hinged door 3 for closing a front-side muffle opening 5.
- the swing door 3 In the FIG. 1 the swing door 3 is shown in an open state.
- On opposite side walls 9 of the cooking appliance muffle 1 are corresponding lateral guide rods 11 and a pull-out system, consisting of two opposite telescopic extensions 13, supported.
- the telescopic extensions 13 are removably supported in a top of four horizontal Garraumebenen. In the underlying three Garraumebenen each of the corresponding guide rods 11 are removably supported.
- On the two corresponding lowermost guide rods 11, a baking sheet 13 is supported, which is partially pushed out of the cooking appliance muffle 1.
- the guide rods 11 are muffelfront document each inserted in a bearing bush 15. This is mounted in a mounting opening of the muffle side wall 9.
- the telescopic extensions 13 are formed with a holding plate 14 which is mounted in each case in an annular groove 16 of the bearing bush 15.
- the guide rods 11 and the telescopic extensions 13 are each mounted in a mounting opening 19. Both the guide rods 11 and the telescopic extensions 13 are tool-free by a user from the muffle 1 to solve.
- the extension system 13 is designed as a telescopic extension.
- the telescopic extension 13 is according to the FIG. 2 in one in the FIG. 1 shown viewing direction I shown in cross section.
- the telescopic extension 13 has a lower holding rail 23, which is held on the holding plate 14 fixed to the muffle side wall 9.
- the telescopic extension 13 consists of a movable intermediate rail 25 and a likewise movable pull-out rail 27.
- the intermediate rail 25 is mounted on balls 29 between the pull-out rail 27 and the stationary support rail 23.
- the configuration of the rails 23, 25, 27 is not limited to the present embodiment.
- the retaining rail 23 may also be formed like a round rod 11.
- the pull-out rail can be guided sliding or mounted on other rolling elements.
- the design of the pull-out rail 27 is not limited to the present embodiment. Rather, the pull-out rail 27 may also be designed as a slide, a runner or another pull-out element. Between the extension element 27 and the support rail 23 can also be dispensed with the arrangement of the intermediate rail 25.
- the support rail 23 and the extension rail 27 are made according to the FIG. 2 from mutually identically formed U-profile parts of an uncoated sheet steel.
- the two rails 23, 27 are arranged facing each other with their open sides. They define a substantially closed cavity 31, in which the intermediate rail 25 is arranged. This means that at least in the retracted state of the telescopic extension 13, the intermediate rail 25 is almost completely enclosed by the pull-out rail 27 and the support rail 23. Splashes of grease, dirt or the like are therefore kept away from the balls 29 and from the intermediate rail 25.
- the intermediate rail 25 is coated with a lubricant layer 33.
- the lubricant layer 33 is in the FIG. 2 shown in exaggerated layer thickness. The layer thickness is realistically in a range between 10 and 20 microns.
- both the balls 29 and the support rail 23 and the drawer rail 27 is not coated with the lubricant layer 33, but uncoated. As a result, the balls 29 run on the one hand on the lubricant layer 33 of the intermediate rail 25 and on the other hand on the uncoated running surfaces of the support rail 23 and the pull-out rail 27th
- the surface properties of the metal surface of the balls 29, the support rail 23 and the pull-out rail 27 on the one hand and the lubricant layer 33 on the other hand are different. Due to these different surface properties results in a particularly good rolling behavior of the balls 29 and thus good running properties of the extension system.
- the holding rail 23 and / or the pull-out rail 27 may be coated with a second layer, as shown in the FIG. 2 is indicated by the reference numeral 34 with a dashed line.
- the two different layers 33 and 34 have different surface properties.
- the rolling behavior of the ball 29 can be improved with a different surface hardness.
- the second layer 34 may be formed as a corrosion resistant layer, for example.
- the lubricant layer 33 comprises particles of an inorganic solid lubricant, such as graphite.
- an inorganic solid lubricant such as graphite.
- a powder of the inorganic solid lubricant is first suspended in a lacquer solution and then the intermediate rail 25 is subsequently coated.
- the paint solution is baked in the intermediate rail 25.
- other methods such as a PVD coating (Physical Vapor Deposition) or a CVD coating (Chemical Vapor Deposition) for producing the lubricant layer 33 are conceivable.
- the lubricant layer 33 of the intermediate rail 25 is sufficient to introduce enough lubricant between the balls 29 and the pull-out rail 27 or the holding rail 23.
- the in the FIG. 2 illustrated U-shaped rails 23, 27 are particularly well suited to protect the intermediate rail 33 from contamination.
- the lubricant layer 33 only with respect to adapt to their lubrication properties. Of subordinate importance in this case is the cleanability of the lubricant layer 33.
- the protection against contamination of the lubricant layer 33 is namely taken over by the U-shaped retaining rail 23 or the pull-out rail 27. These act at least in the inserted state as cover with respect to the intermediate rail 25. An contamination of the intermediate rail 25 is therefore largely reduced.
- the balls 29 are arranged in two opposing ball cages 37.
- the balls 29 are rotatably supported in the ball cages 37.
- the ball cage 37 consists of a thin sheet steel, which is formed into an angular part with three trapezoidally arranged in profile sides 39.
- recesses 41 are cut out.
- the recesses 41 are arranged on each side 39 in two consecutive rows. The two rows are spaced apart by a central portion 43 of the ball cage 37.
- Each recess 41 is partially bounded by an angled embossing edge 45 which holds the ball 29 in the recess 41.
- the in the Figures 2 and 3 shown ball cages 37 are additionally coated with the lubricant layer 33.
- the applied on the ball cage 37 lubricant layer 33 is indicated by dashed line.
- the applied on the ball cage 37 lubricant layer 33 indicated in hatching.
- the application of the lubricant layer 33 on the ball cage 37 takes place here as the application of the lubricant layer 33 to the respective rail.
- the ball cages 37 are freely movable between the rails 23, 25, 27 in the longitudinal direction.
- the end faces 47 of each ball cage 37 are used in the in the FIG. 2 shown telescopic extension 13 as stops that limit a longitudinal movement of the rails 23, 25, 27.
- the telescopic extension 13 can therefore be pulled apart until the end faces 47 of the ball cage 37 come into contact with corresponding rail stops, not shown.
- FIG. 4 a cooking appliance, which corresponds to the cooking appliance of the first embodiment.
- the telescopic rails 13 of the extension system consists of the stationary support rail 23 and the pull-out rail 25 mounted directly thereon. On the intermediate rail 25 is omitted.
- the pull-out rail 25 is mounted, as in the first embodiment, on balls 29, which are held in the ball cages 37.
- the movable pull-out rail 27 is coated with the lubricant layer 33.
- the lubricant is distributed in sufficient quantity in the extension system.
- the stationary support rail 23 is uncoated.
- the balls 29 therefore roll between rolling surfaces with different surface properties, resulting in a particularly good rolling behavior of the balls 29 and thus good running properties of the extension system.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubricants (AREA)
- Bearings For Parts Moving Linearly (AREA)
- Drawers Of Furniture (AREA)
Description
Die Erfindung betrifft ein Auszugssystem für ein Haushaltsgerät, insbesondere Gargerät, das zumindest eine ortsfeste Halteschiene und eine bewegliche Auszugsschiene zur Halterung eines Gargutträgers aufweist, von denen zumindest eine erste Schiene mit einer ersten Schicht beschichtet ist, die einen Schmierstoff aufweist.The invention relates to an extension system for a household appliance, in particular cooking appliance having at least one stationary holding rail and a movable pull-out rail for holding a food support, of which at least a first rail is coated with a first layer having a lubricant.
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Die Aufgabe der Erfindung besteht darin, ein Auszugssystem für ein Haushaltsgerät bereitzustellen, das dauerhaft gute Lauf- oder Gleiteigenschaften aufweist.The object of the invention is to provide a drawer system for a household appliance, which permanently has good running or sliding properties.
Die Aufgabe der Erfindung ist mit einem Haushaltsgerät mit den Merkmalen des Patentsanspruchs 1 gelöst. Gemäß dem Patentanspruch 1 ist ein Auszugssystem für ein Haushaltsgerät, insbesondere Gargerät, das eine ortsfeste Halteschiene, eine bewegliche Zwischenschiene und eine über Kugeln beweglich gelagerte Auszugsschiene zur Halterung eines Gargutträgers aufweist, wobei die Zwischenschiene über Kugeln zwischen der Auszugsschiene und der Halteschiene gelagert ist und von denen zumindest die Zwischenschiene mit einer ersten Schicht beschichtet ist, die einen Schmierstoff aufweist, wobei zumindest eine der anderen Schienen mit einer zweiten Schicht beschichtet ist oder unbeschichtet ist, wobei
- die Schmierstoffschicht ein Bindemittel aufweist, das den Schmierstoff an der Schiene hält; und
- von der Schmierstoffschicht aufgrund der Rotation der Kugeln abgeriebene Schmierstoffpartikel in dem Auszugssystem auch aufgrund der Rotation der Kugeln Lauf- oder Gleitflächen erreichen, die nicht mit einer Schmierstoffschicht in Kontakt sind.Erfindungsgemäß ist erkannt worden, dass es für eine ausreichende Schmierung des gesamten Auszugssystems genügt, lediglich eine der Schienen mit einer Schmierstoffschicht zu versehen. Von der Schmierstoffschicht abgeriebene Schmierstoffpartikel können in dem erfindungsgemäßen Auszugssystem auch Lauf- oder Gleitflächen erreichen, die nicht mit einer Schmierstoffschicht in Kontakt sind. Dies reicht aus, um aufgabengemäß eine Leichtgängigkeit des Auszugssystems aufrechtzuerhalten.
- the lubricant layer comprises a binder that holds the lubricant to the rail; and
- from the lubricant layer due to the rotation of the balls rubbed lubricant particles in the extraction system also due to the rotation of the balls reach running or sliding surfaces which are not in contact with a lubricant layer. According to the invention, it has been recognized that it suffices for a sufficient lubrication of the entire extension system, only one of the rails with a lubricant layer to provide. Lubricant particles rubbed off from the lubricant layer can also reach running or sliding surfaces in the pull-out system according to the invention which are not in contact with a lubricant layer. This is sufficient in order to maintain a smooth running of the extraction system.
Weiter ergeben sich nach dem Patentanspruch 1 für die Schienen unterschiedliche Oberflächeneigenschaften. Dadurch kann das Lauf- oder Gleitverhalten des Auszugssystems wesentlich gesteigert werden. Das Lauf- oder Gleitverhalten verbessert sich insbesondere dann, wenn die Schienen mit Schichten unterschiedlicher Oberflächenhärte beschichtet sind. In Hinblick auf eine günstige Fertigung ist es dabei bevorzugt, wenn zumindest eine der Schienen unbeschichtet ist, d.h. eine metallische Oberfläche aufweist.Next arise according to claim 1 for the rails different surface properties. As a result, the running or sliding behavior of the extension system can be significantly increased. The running or sliding behavior improves in particular when the rails are coated with layers of different surface hardness. In view of a favorable production, it is preferred if at least one of the rails is uncoated, i. has a metallic surface.
Besonders bevorzugt ist es, wenn der Schmierstoff ein anorganischer Festschmierstoff ist. Ein derartiger Schmierstoff ist im Gegensatz zu vielen anderen Schmierstoffen, wie etwa Flüssigschmierstoffen aus Öl oder Fett, auch bei hohen Temperaturen physiologisch unbedenklich.It is particularly preferred if the lubricant is an inorganic solid lubricant. Such a lubricant, in contrast to many other lubricants, such as liquid lubricants of oil or fat, even at high temperatures physiologically harmless.
Von Vorteil ist es, wenn der Schmierstoff chemisch resistent ist, insbesondere laugenbeständig ist, um eine Reinigung in Geschirrspülmaschine zu ermöglichen. In diesem Fall kann das Auszugssystem auch chemisch aggressiven Medien, beispielsweise Laugen in einer Geschirrspülmaschine, ausgesetzt werden.It is advantageous if the lubricant is chemically resistant, in particular alkali-resistant, to enable cleaning in a dishwasher. In this case, the extraction system can also be exposed to chemically aggressive media, for example alkalis in a dishwashing machine.
Anorganische Festschmierstoffe können sich besonders einfach aus einem Schichtgefüge lösen. Ein Verteilen des anorganischen Festschmierstoff auf Bauteile, die nicht mit dem Festschmierstoff beschichtet sind, ist daher besonders einfach ermöglicht. Quietschgeräusche oder eine Schwergängigkeit des Auszugssystems sind daher zuverlässig verhindert.Inorganic solid lubricants are particularly easy to detach from a layer structure. Distributing the inorganic solid lubricant to components that are not coated with the solid lubricant is therefore particularly easy. Squeaking noises or a stiffness of the extension system are therefore reliably prevented.
Erfindungsgemäß kann es von Vorteil sein, wenn der Schmierstoff hochtemperaturbeständig ist. Hierzu kommen alle Schmierstoffe in Frage, die bis zu maximalen Garbetriebstemperaturen von bis zu 300° C und gegebenenfalls bis 500° bis 600° C bei der Pyrolyse beständig sind. Besonders bevorzugt ist es dabei, wenn als Festschmierstoff Graphit verwendet wird. Graphit ist selbst bei sehr hohen Temperaturen einsetzbar sowie chemisch resistent und auch kostengünstig. Weiterhin kann als Festschmierstoff Molybdändisulfid verwendet werden. In diesem Fall kann es jedoch bei sehr hohen Temperaturen wegen der Erzeugung von S2 problematisch werden. Sofern die Fertigungskosten nur von nachrangiger Bedeutung sind, ist als Festschmierstoff auch Bornitrid denkbar, das in allen Temperaturbereichen beständig und physiologisch unbedenklich ist. Entsprechendes gilt auch für Wolframdisulfid.According to the invention it may be advantageous if the lubricant is resistant to high temperatures. For this purpose, all lubricants come into question, which are up to maximum cooking temperatures of up to 300 ° C and optionally up to 500 ° to 600 ° C in the pyrolysis resistant. It is particularly preferred if graphite is used as the solid lubricant. Graphite can be used even at very high temperatures as well as chemically resistant and cost-effective. Furthermore, as a solid lubricant Molybdenum disulfide can be used. In this case, however, it may become problematic at very high temperatures because of the generation of S 2 . If the manufacturing costs are only of secondary importance, as a solid lubricant and boron nitride is conceivable that is resistant and physiologically harmless in all temperature ranges. The same applies to tungsten disulfide.
Von Vorteil ist es, wenn die Schmierstoffschicht ein Bindemittel aufweist, das den Schmierstoff an der Schiene hält. Das Bindemittel bewirkt einen verbesserte Verbindung des Schmierstoffes mit der Schienenoberfläche. Eine solche Verbindung ist im Unterschied dazu nicht gegeben, wenn der Schmierstoff lediglich in einer aufgerauten Schienenoberfläche Halt findet. Besonders vorteilhaft im Hinblick auf eine Schmierstoffschicht mit gleichmäßiger Schichtdicke und gleichmäßigen Oberflächeneigenschaften ist es, wenn das Bindemittel ein Lack ist. Dieser kann beispielsweise auf die Schiene gesprüht werden, wodurch sich eine gleichmäßige Schichtdicke ergibt. Anschließend kann der auf der Schiene aufgebrachte Lack zusammen mit dem Schmierstoff in die Schiene eingebrannt werden. Vorteilig ist dabei der Schmierstoff in dem Lack suspendiert. Durch das Einbrennen können dauerhaft zuverlässige Schmiereigenschaften der Schiene erreicht werden, selbst wenn der Teleskopauszug chemisch aggressiven Medien oder hohen Temperaturen ausgesetzt wird.It is advantageous if the lubricant layer has a binder that holds the lubricant to the rail. The binder provides improved bonding of the lubricant to the rail surface. In contrast, such a connection does not exist if the lubricant only finds support in a roughened rail surface. It is particularly advantageous with regard to a lubricant layer having a uniform layer thickness and uniform surface properties when the binder is a lacquer. This can be sprayed for example on the rail, resulting in a uniform layer thickness. Subsequently, the paint applied to the rail can be burned into the rail together with the lubricant. Advantageously, the lubricant is suspended in the paint. By firing permanently reliable lubrication properties of the rail can be achieved, even if the telescopic extension is exposed to chemically aggressive media or high temperatures.
Um die Abriebsfestigkeit der Schienenbeschichtung bzw. deren Schichtqualität den Anforderungen entsprechend einzustellen, sind auch Kombinationen der oben genannten Festschmierstoffe aus Graphit, Molybdändisulfid (MoS2), Bornitrid oder Wolframdisulfid denkbar.In order to adjust the abrasion resistance of the rail coating or its layer quality to the requirements, combinations of the abovementioned solid lubricants made of graphite, molybdenum disulfide (MoS 2 ), boron nitride or tungsten disulfide are also conceivable.
Im Vergleich zu einer Gleitlagerung kann mit einer Wälzlagerung im Auszugssystem ein verbessertes Auszugsverhalten erreicht werden. Im Unterschied zu einer Gleitlagerung wird zwischen den beweglichen Bauteilen keine Reibungskraft erzeugt, sondern rollen die beweglichen Bauteile über Wälzkörper gegeneinander ab. Dadurch ist bei einem Auszugsystem mit Gleitlagerung wesentlich weniger Schmiermittel erforderlich. Es kann daher auch eine Schmierstoffschicht mit qualitativ geringeren Anforderungen eingesetzt werden.Compared to a plain bearing, with a roller bearing in the extension system an improved pull-out behavior can be achieved. In contrast to a sliding bearing, no frictional force is generated between the movable components, but instead roll the movable components against each other via rolling elements. As a result, in a drawer system with plain bearing significantly less lubricant is required. It is therefore also possible to use a lubricant layer with lower quality requirements.
Erfindungsgemäß kann die Schmierung des Auszugssystems über eine nur auf der Zwischenschiene vorgesehene Schmierstoffschicht erreicht werden. Andere Bauteile in dem Auszugssystem, etwa Schienen, Wälzkörper oder Wälzkörperkäfige müssen daher keine Schmierfunktion übernehmen. Die Wälzkörper und/oder deren Wälzkörperkäfige können daher speziell als Begrenzungsanschläge ausgebildet werden. Dabei auftretende Belastungen könnten beispielsweise auf aus Kohlenstoff basierende Wälzkörperkäfige (sog. PEEK-Käfige) nicht standhalten.According to the invention, the lubrication of the extraction system can be achieved via a lubricant layer provided only on the intermediate rail. Other components in the extension system, such as rails, rolling elements or Wälzkörperkäfige must therefore take no lubricating function. The rolling elements and / or their Wälzkörperkäfige can therefore be specially designed as limit stops. This occurring loads could not withstand, for example on carbon-based Wälzkörperkäfige (so-called. PEEK cages).
Fertigungstechnisch bevorzugt ist es, wenn die Zwischenschiene vollständig mit dem Schmierstoff beschichtet ist. Im Vergleich zu einer nur teilweisen Beschichtung der Zwischenschiene kann somit der Beschichtungsvorgang wesentlich vereinfacht werden.In terms of manufacturing technology, it is preferred if the intermediate rail is completely coated with the lubricant. Compared to a partial coating of the intermediate rail thus the coating process can be significantly simplified.
Spielt der Fertigungsaufwand zum Aufbringen der Schmierstoffschicht auf die Schiene nur eine untergeordnete Rolle, so ist es denkbar, mehrere Schmierstoffschichten mit verschiedenen Eigenschaften aufzutragen. In diesem Fall kann eine unterste Schichtlage einen großen Anteil an Bindemitteln und entsprechend wenig Festschmierstoff aufweisen. Dadurch ist eine abriebsfeste Halterung des Schmierstoffs auf der Schiene gesichert. Eine oberste Lage kann dagegen wenig Bindemittel und dafür einen hohen Anteil an Festschmierstoff aufweisen. Dadurch ist die Schmiereigenschaft der Zwischenschiene erhöht.Plays the production cost for applying the lubricant layer on the rail only a minor role, it is conceivable to apply several lubricant layers with different properties. In this case, a lowermost layer layer may have a large proportion of binders and correspondingly less solid lubricant. As a result, an abrasion-resistant mounting of the lubricant is secured to the rail. On the other hand, an uppermost layer can have little binder and, for that, a high proportion of solid lubricant. As a result, the lubricating property of the intermediate rail is increased.
Darüber hinaus kann die den Schmierstoff enthaltende Schicht weitere Füllstoffe, etwa aus Keramik enthalten, um dessen Schichtqualität oder Abriebsfestigkeit einzustellen.In addition, the lubricant-containing layer may contain further fillers, such as ceramic, to adjust its layer quality or abrasion resistance.
Gemäß einer weiteren Ausführungsform kann das Auszugssystem herausnehmbar in dem Gargerät gehaltert sein. In diesem Fall ist einerseits eine einfache Reinigung des Auszugssystems außerhalb des Gargeräts erreicht. Andererseits kann beispielsweise bei einem Pyrolysebetrieb im Gargerät das Auszugssystem herausgenommen werden, um es nicht den hohen Temperaturen im Pyrolysebetrieb auszusetzen.According to a further embodiment, the extension system may be removably mounted in the cooking appliance. In this case, on the one hand, a simple cleaning of the pull-out system outside of the cooking appliance is achieved. On the other hand, for example, in a pyrolysis operation in the cooking appliance, the extraction system can be removed so as not to expose it to high temperatures in pyrolysis operation.
Bevorzugt kann das Auszugssystem derart ausgebildet sein, dass die mit der Schmierstoffschicht beschichtete Schiene vor Verunreinigungen geschützt ist. Beispielsweise kann die Halteschiene und/oder die Auszugsschiene einen Hohlraum begrenzen, in dem die mit der Schmierstoffschicht beschichtete Zwischenschiene angeordnet ist. In diesem Fall ist die Zwischenschiene zumindest im Garbetrieb in den durch die Halteschiene/Auszugsschiene gebildeten Hohlraum eingeschoben. Eine Verunreinigung der Zwischenschiene durch Garflüssigkeit oder durch Wrasen ist dadurch wesentlich reduziert. Dadurch bietet sich an, dass die Schmierstoffschicht einen anorganischen Festschmierstoff aufweist. Ein derartige Schmierstoffschicht weist herausragende Schmiereigenschaften auf, ist jedoch nur schwer zu reinigen. Dies liegt in den physikalischen Eigenschaften von anorganischen Festschmierstoffen begründet. Die schlechte Reinigbarkeit spielt jedoch nur eine untergeordnete Rolle, wenn die, die Schmierstoffschicht aufweisende Schiene weitgehend vor Verunreinigungen geschützt ist.Preferably, the extraction system can be designed such that the coated with the lubricant layer rail is protected from contamination. For example, the holding rail and / or the pull-out rail define a cavity in which the intermediate layer coated with the lubricant layer is arranged. In this case, the intermediate rail is inserted at least in the cooking mode in the cavity formed by the retaining rail / pull-out rail. A contamination of the intermediate rail by cooking liquid or by vapors is thereby substantially reduced. This makes it possible that the lubricant layer has an inorganic solid lubricant. Such a lubricant layer has excellent lubricating properties, but is difficult to clean. This is due to the physical properties of inorganic solid lubricants. The poor cleanability, however, plays only a minor role, if the, the lubricant layer having rail is largely protected from contamination.
Nachfolgend sind zwei Ausführungsbeispiele der Erfindung anhand der beigefügten Figuren beschrieben. Es zeigen:
- Figur 1
- gemäß dem ersten Ausführungsbeispiel ein Auszugssystem in einem Gargerät;
- Figur 2
- in einer Schnittdarstellung das Auszugssystem des Gargeräts;
Figur 3- einen Kugelkäfig des Auszugssystems; und
- Figur 4
- gemäß einem zweiten Ausführungsbeispiel ein Auszugssystem in einem Gargerät.
- FIG. 1
- according to the first embodiment, an extension system in a cooking appliance;
- FIG. 2
- in a sectional view of the extension system of the cooking appliance;
- FIG. 3
- a ball cage of the extension system; and
- FIG. 4
- according to a second embodiment, an extension system in a cooking appliance.
In der
Vorliegend ist das Auszugssystem 13 als ein Teleskopauszug ausgebildet. Der Teleskopauszug 13 ist gemäß der
Sowohl die Halteplatte 14 als auch die Lagerbuchse 15 sind in der
Die Ausgestaltung der Schienen 23, 25, 27 ist nicht auf das vorliegende Ausführungsbeispiel beschränkt. So kann die Halteschiene 23 auch wie ein Rundstab 11 ausgebildet sein. Auf der Halteschiene 23 kann die Auszugsschiene gleitend oder über andere Wälzkörper gelagert geführt sein. Dabei ist die Ausgestaltung der Auszugsschiene 27 nicht auf das vorliegende Ausführungsbeispiel beschränkt. Vielmehr kann die Auszugsschiene 27 auch als ein Schlitten, ein Läufer oder ein sonstiges Auszugselement ausgebildet sein. Zwischen dem Auszugselement 27 und der Halteschiene 23 kann auch auf die Anordnung der Zwischenschiene 25 verzichtet werden.The configuration of the
Die Halteschiene 23 und die Auszugsschiene 27 bestehen gemäß der
Um ein leichtgängiges Herausziehen und Zusammenschieben des Auszugssystems zu gestatten, ist die Zwischenschiene 25 mit einer Schmierstoffschicht 33 beschichtet. Die Schmierstoffschicht 33 ist in der
Die Oberflächeneigenschaften der Metalloberfläche der Kugeln 29, der Halteschiene 23 sowie der Auszugsschiene 27 einerseits und der Schmierstoffschicht 33 andererseits sind unterschiedlich. Aufgrund dieser unterschiedlichen Oberflächeneigenschaften ergibt sich ein besonders gutes Abrollverhalten der Kugeln 29 und somit gute Laufeigenschaften des Auszugssystems.The surface properties of the metal surface of the
Alternativ kann die Halteschiene 23 und/oder die Auszugsschiene 27 mit einer zweiten Schicht beschichtet sein, wie sie in der
Vorliegend weist die Schmierstoffschicht 33 Partikel aus einem anorganischen Festschmierstoff, wie etwa Graphit auf. Zur Herstellung der Schmierstoffschicht 33 wird zunächst ein Pulver des anorganischen Festschmierstoffs in einer Lacklösung suspendiert und damit anschließend die Zwischenschiene 25 beschichtet. In einem weiteren Arbeitsschritt wird die Lacklösung in die Zwischenschiene 25 eingebrannt. Dadurch ergibt sich eine äußerst hohe mechanische Abriebsfestigkeit der Beschichtung 33 sowie eine gute chemische Widerstandsfähigkeit gegenüber aggressiven Medien, wie etwa Waschmitteln. Neben diesem kostengünstigen Lackierverfahren sind auch andere Verfahren, wie etwa eine PVD-Beschichtung (Physical Vapour Deposition) oder eine CVD-Beschichtung (Chemical Vapour Deposition) zur Herstellung der Schmierstoffschicht 33 denkbar.In the present case, the
Die Schmierstoffschicht 33 der Zwischenschiene 25 reicht aus, um auch zwischen den Kugeln 29 und der Auszugsschiene 27 bzw. der Halteschiene 23 genügend Schmierstoff einzubringen. Die in der
Erst ein solcher Schutz der Zwischenschiene 25 vor Verunreinigungen ermöglicht daher sinnvoller Weise eine Beschichtung der Zwischenschiene 25 mit der anorganischen Festschmierstoffschicht 33. Eine derartige Schicht ist nämlich - verglichen etwa mit einer auf PTFE basierenden Schicht - nur sehr schwer zu reinigen.Only such a protection of the
Gemäß den
Die in den
Die Kugelkäfige 37 sind zwischen den Schienen 23, 25, 27 in Längsrichtung frei beweglich. Die Stirnseiten 47 jedes Kugelkäfigs 37 dienen in dem in der
In der
Gemäß der
Claims (23)
- Pull-out system for a household appliance, in particular cooking appliance, which has a fixed retaining rail (23), a movable intermediate rail (25) and a pull-out rail (27) supported movably by way of ball bearings (29) for retaining a food carrier (13), wherein the intermediate rail (25) is supported between the pull-out rail (25) and the retaining rail (23) by way of ball bearings (29) and of which at least the intermediate rail (25) is coated with a first coating (33) which has a lubricant, wherein at least one of the other rails (23, 27; 23) is coated with a second coating (34) or is uncoated, characterised in that- the lubricant coating (33) has a binding agent which retains the lubricant on the rail (25; 27; 23, 27; 23); and- lubricant particles in the pull-out system which have been rubbed off from the lubricant coating as a result of rotation of the ball bearings (29) reach running or sliding surfaces also as a result of the rotation of the ball bearings (29), said running or sliding surfaces not being in contact with a lubricant coating.
- Pull-out system according to one of the preceding claims, characterised in that the lubricant coating (33) has an inorganic solid lubricant.
- Pull-out system according to one of the preceding claims, characterised in that the lubricant coating (33) is embodied to be chemically resistant.
- Pull-out system according to one of the preceding claims, characterised in that the lubricant coating (33) is embodied to be resistant to high temperatures.
- Pull-out system according to one of the preceding claims, characterised in that the lubricant coating (33) has graphite.
- Pull-out system according to one of the preceding claims, characterised in that the lubricant coating (33) has molybdenum disulphide.
- Pull-out system according to one of the preceding claims, characterised in that the lubricant coating (33) has boron nitride.
- Pull-out system according to one of the preceding claims, characterised in that the lubricant coating (33) has tungsten disulphide.
- Pull-out system according to one of the preceding claims, characterised in that the lubricant coating (33) has a binding agent which retains the lubricant on the first rail (33).
- Pull-out system according to claim 9, characterised in that the binding agent is a paint.
- Pull-out system according to claim 10, characterised in that the paint with the lubricant is baked into the intermediate rail (25).
- Pull-out system according to one of the preceding claims, characterised in that the rails (23, 25, 27) are supported in the pull-out system by way of rolling elements (29).
- Pull-out system according to claim 12, characterised in that the rolling elements (29) are arranged in a rolling element cage (37).
- Pull-out system according to claim 13, characterised in that the rolling element cage (37) is embodied as a stop for restricting a movement of the rails (25, 27).
- Pull-out system according to one of claims 13 or 14, characterised in that the rolling element cage (37) is coated with a lubricant coating (33).
- Pull-out system according to one of the preceding claims, characterised in that the intermediate rail (25) is coated entirely with the lubricant coating (33).
- Pull-out system according to one of the preceding claims, characterised in that the lubricant coating (33) is embodied at least partially with multiple coatings.
- Pull-out system according to one of the preceding claims, characterised in that the lubricant coating (33) contains further filler materials, for instance made from ceramic.
- Pull-out system according to one of the preceding claims, characterised in that the pull-out system (13) is retained in a removable manner in the household appliance.
- Pull-out system according to one of the preceding claims, characterised in that the retaining rail (23) and/or the pull-out rail (28) protects the intermediate rail (25) from dirt.
- Pull-out system according to one of the preceding claims, characterised in that the retaining rail (23) and/or the pull-out rail (27) surrounds the intermediate rail (25).
- Pull-out system according to one of the preceding claims, characterised in that the retaining rail (23) and/or the pull-out rail (27) restrict a cavity (31) in which the intermediate rail (25) is arranged.
- Household appliance with a pull-out system according to one of the preceding claims.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102004019102 | 2004-04-20 | ||
DE102004019102A DE102004019102A1 (en) | 2004-04-20 | 2004-04-20 | Pull-out system for a household appliance |
Publications (2)
Publication Number | Publication Date |
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EP1589289A1 EP1589289A1 (en) | 2005-10-26 |
EP1589289B1 true EP1589289B1 (en) | 2019-06-12 |
Family
ID=34939381
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05103122.7A Active EP1589289B1 (en) | 2004-04-20 | 2005-04-19 | Pull-out system for household appliance |
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EP (1) | EP1589289B1 (en) |
DE (1) | DE102004019102A1 (en) |
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DE102004019102A1 (en) | 2005-11-24 |
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