Domestic appliance and pull-out guide for a domestic appliance

Abstract

The invention relates to a pull-out guide for a domestic appliance with a microwave cooking function, comprising a rack rail (1) and at least one metal guide rail (2) movable relative thereto as a shelf for a cooking product carrier, wherein a stopper (3) is disposed in a front region of the guide rail (2) as seen in the pull-out direction, which stopper (3) has an abutment element (32) for the cooking product carrier projecting forwards and upwards over the guide rail (2). The pull-out guide is distinguished in that the stopper (3) is at least partially manufactured from an electrically insulating material. The invention also relates to a domestic appliance with a microwave cooking function and to a pull-out guide of this kind.

Description

[0001] The invention relates to a drawer slide for a household appliance with a microwave cooking function, comprising a cabinet rail and at least one movable metallic guide rail for holding a food carrier, wherein the at least one guide rail has a substantially U-shaped profile with two legs, and wherein a plug is arranged in a forward region of the guide rail (as viewed in the extension direction), the plug having a support element for the food carrier projecting forward and upward beyond the guide rail. The invention further relates to a household appliance with a microwave cooking function having such a drawer slide.

[0002] Various types of household appliances have become standard features of pull-out guides. These guides allow removable supports to be placed on the supports, which can then be easily inserted into or extended from the appliance and removed more easily. One such pull-out guide for household appliances like ovens or microwave ovens is known, for example, from German patent application DE 10 2005 028 674 A1. A plug is inserted into the front end of a guide rail. This plug has an integrated contact element that covers the rail for aesthetic reasons and prevents sharp edges from protruding at the front, thus preventing injury. The contact element also prevents the support from slipping off the rail. In cooking appliances, such supports include, for example, baking trays or racks.

[0003] As a rule, both the guide rails of the drawer slides and the cooking trays are made of a metallic material. For example, German patent application DE 20 2008 006 302 U1 describes a drawer slide with guide rails made of aluminum-coated sheet steel. The aluminum coating provides high temperature and corrosion resistance.

[0004] Metal-on-metal contact is electrically conductive and also a good thermal conductor, which can be problematic in cooking appliances, and especially in microwave ovens. Electrical contact between the drawer slide and the typically conductive front glass of a microwave oven is also undesirable due to the potential for sparking.

[0005] To prevent electrical contact, it is known in microwave ovens to coat the cooking trays and / or the guide rail of the pull-out tray with an electrically insulating coating, for example, a ceramic coating. However, such a coating is susceptible to scratches. German patent applications DE 102 11 470 A1 and DE 10 2010 036 952 A1 describe a coating that is at least partially coated with a ceramic material. PTFE A polytetrafluoroethylene (PTFE) coated drawer slide for a cooking appliance is known. The coating makes the drawer slide easier to clean and offers advantages in terms of smooth operation of the drawer system, as this coating also dampens noise.

[0006] However, due to their thinness, both the aforementioned PTFE coating and a ceramic coating are only conditionally suitable for electrically insulating the drawer guide from a door or the front glass of a microwave oven in such a way as to reliably prevent sparking.

[0007] It is an object of the present invention to create a pull-out guide for a household appliance with microwave cooking function and a household appliance equipped therewith, in which good insulation between the running rail and the door or other front of a microwave cooking appliance can be achieved without great effort and permanently.

[0008] This problem is solved by a drawer slide or a household appliance with a microwave cooking function, possessing the features of the respective independent claim. Advantageous embodiments and further developments are the subject of the dependent claims.

[0009] An extractor guide of the type mentioned at the outset according to the invention is characterized in that the plug is at least partially made of an electrically insulating material and that a contact element is arranged in the plug which electrically contacts two end sections of the legs of the guide rail with each other.

[0010] Instead of or in addition to coating the guide rail, effective protection against arcing from the guide rail to the front of the microwave oven is achieved by the plug, in particular by the contact element, which covers the guide rail at the front and preferably also on all sides, and which is made at least partially of an electrically insulating material. The resulting gap between the metal guide rail and the front prevents arcing. This is particularly effective if the contact element extends beyond the guide rail on all sides. This is already ensured at the top due to its function as a stop for the cooking tray; even a slight overhang to the left, right, and bottom is an effective means of preventing arcing.

[0011] If the plug is made of an insulating material, microwaves could penetrate the U-shaped guide rail from the front through the plug. Within the guide rail, the microwaves would then be propagated by reflection until they encounter an obstacle, such as a rolling element cage. There, they would release their energy, leading to unnecessary and undesirable heating of the obstacle and thus of the drawer slide. The electrical contacting of the end sections of the guide rail by the contact element, as described in the invention, effectively prevents microwaves from penetrating the volume enclosed by the guide rail.

[0012] Among other things, the following electrically insulating materials can be used: ceramics, high-temperature resistant thermoplastic polymers, especially from the polyetherketone family (e.g., polyetheretherketone - PEEK) and / or elastomers, especially from the polysiloxane or thermoset family.

[0013] In a preferred embodiment, at least the mounting element is made of an electrically insulating material. Since it is part of the plug located at the front of the guide rail, it can be made of an insulating material and still be easily mounted to the guide rail. The plug, which is inserted into the guide rail or partially encompasses it, creates a friction-fit or positive-locking connection between the plug and the guide rail, thereby securing the mounting element to the guide rail. The material of the plug or the mounting element can also be thermally insulating and / or shock-absorbing to protect the front of the appliance mechanically and with regard to local thermal stresses.

[0014] It is noted that, for the purposes of the application, a plug is an element that can be inserted into the guide rail from the front or from the side, or that can be attached to the guide rail from the front or from the side. In one embodiment of the drawer guide, the plug then comprises an insertion body that can be inserted into the front end of the guide rail. In another embodiment, instead of the insertion body, a base body is provided that at least partially encompasses a front section of the guide rail. The base body can, for example, be C-shaped in order to grip the guide rail and, if necessary, also be clipped on from the side.

[0015] In both cases, the attachment to the guide rail can be achieved by clamping, snap-fit, and / or material bonding, particularly by thermal joining. In the embodiment with the insert body, a positive-locking attachment can be achieved additionally or alternatively by deforming, particularly by countersinking, a section of the guide rail in the front area after the insert body has been inserted into the guide rail. For example, the guide rail can have a die-cut web that is pressed in accordingly for deformation and engages behind an edge of the insert body. In the embodiment with the encompassing base body, this can have a projection for additional fastening that engages in a bore or recess in the guide rail.

[0016] The plug can be a single piece or at least two-part, in which case at least the contact element is not integrally formed with the insertion body or the base body. The two- or multi-part design allows the contact element to be made of a different material than the insertion body or the base body. For example, the contact element can be made of ceramic, while the insertion body is made of plastic. The elasticity of the plastic allows for good frictional engagement between the insertion body and the guide rail, meaning the plug can be securely fastened in the guide rail. The ceramic material of the contact element provides good electrical insulation and offers particularly good protection against flashovers.However, it is also conceivable to manufacture the insert body from the electrically insulating material, in particular from a ceramic or PEEK, and the mounting element from a different material.

[0017] In an advantageous embodiment of the drawer guide, the plug also features a support section for the food carrier, aligned parallel to the extension direction and projecting upwards beyond the guide rail. This allows the plug to serve as a support for the food carrier and to electrically insulate it from the guide rail. A guide pin for the food carrier can also be arranged, projecting upwards in the area of ​​the plug's support section. If the guide pin engages in a corresponding recess or depression in the food carrier, it also secures the carrier laterally and / or in the extension direction.

[0018] InIn a further advantageous embodiment, the drawer guide has a stop element mounted on the guide rail in a rearward area (viewed from the pull-out direction) and featuring a stop for the food carrier projecting upwards beyond the guide rail. Preferably, the stop element has a further support section for the food carrier, aligned parallel to the pull-out direction and projecting upwards beyond the guide rail. The food carrier thus rests on the support section of the stop in its front area and on the further support section of the stop element in its rear area. If the support section of the stop and the further support section are of the same thickness, the food carrier is aligned parallel to the guide rail. Alternatively, it is possible to design the two support sections with defined and, if necessary, significantly different thicknesses. InIn this case, even with a flat orientation of the cooking tray, an inclination of the drawer guide can be provided, which, for example, prevents or facilitates the automatic opening and closing of the drawer guide without tilting the cooking tray. Preferably, the stop element as a whole, or at least the further support section, is made of an insulating material, so that the cooking tray is then completely electrically insulated from the running rail.

[0019] Furthermore, the stop can be formed by a protrusion that allows the stop element to rest against a stop bolt located on the guide rail. Such stop bolts are often standard features on guide rails and can then be advantageously used as a fastening point for the stop element. A damping cap made of a softer material than the material of the protrusion can also be attached to it. This results in a noise-dampened stop and a soft landing of the cooking tray.

[0020] A household appliance with a microwave cooking function according to the invention is characterized by having at least one such pull-out guide. The advantages mentioned in connection with the pull-out guide result from this.

[0021] The invention is explained in more detail below using examples and figures. The figures show: Fig. 1a an isometric view of a drawer slide with a front stop and a rear stop element; Fig. 1b the drawer slide of the Fig. 1a with the plug or stop element removed; Fig. 1 shows a representation of the extension guide of the Figures 1a, b with a baking tray placed on top; Fig. 2a an isometric view of another pull-out guide with the stop or stop element removed and a section of a baking tray to be placed on top; Fig. 2b Pull-out guides according to Figure 2a with baking tray placed on top; Fig. 2c a detailed view from Figure 2b ; Fig. 3a, further extension guide with removed plugs or stop element ( Fig. 3a ) and assembled with a baking tray placed on top ( Fig. 3b ); Fig. 4a, further extension guide with removed plugs or stop element ( Fig. 4a ) and assembled with a baking tray placed on top ( Fig. 4b ); Fig. 5a, further extension guide in an isometric overall view ( Fig. 5a) and a detailed representation of its anterior section ( Fig. 5b ); Fig. 6a, further extension guide according to the invention without ( Fig. 6a ) and with a baking tray placed on top ( Fig. 6b ); Fig. 6c two isometric detail views of the plug of the extension guide of the Fig. 6a , b; Fig. 7a, bRepresentations of a front section of a further extension guide with removed ( Fig. 7a ) or deployed ( Fig. 7b ) Plug; Fig. 8a, bRepresentations of a front section of another extension guide with the ( removed) Fig. 8a ) or deployed ( Fig. 8b ) Plug; Fig. 9a-c Representations of a front section of another extension guide with the ( removed) Fig. 9a, b ) or deployed ( Fig. 9c ) Plug; Fig. 10a-c Representations of a front section of another extension guide with the ( removed) Fig. 10a, b ) or deployed ( Fig. 10c) Plug; Fig. 11a-c Representations of a front section of another extension guide with the ( removed) Fig. 11a, b ) or deployed ( Fig. 11c ) Plug; Fig. 12a-c Representations of a front section of an extension guide according to the invention in a first embodiment with the ( removed) Fig. 12a, b ) or deployed ( Fig. 12c ) Plugs; Fig. 13a, b Representation analogous to the Figs. 12b and 12c from a different perspective; Fig. 14a, b Representations of a front section of a further extension guide according to the invention in a second embodiment with the ( removed) Fig. 14a ) or deployed ( Fig. 14b ) Plug; Fig. 15a-c different representations of the plug ( Fig. 15a, b ) or the running rail with inserted plug ( Fig. 15c ) according to Figures 14a, b; Fig. 16a, b Representations of a front section of a further extension guide according to the invention in a third embodiment with the ( removed Fig. 16a ) or deployed ( Fig. 16b ) Plug; and Fig. 17a-c different representations of the plug ( Fig. 17a, b ) or the running rail with inserted plug ( Fig. 17c ) according to Figures 16a, b.

[0022] In In all figures, identical reference symbols denote identical or similarly functioning elements. For clarity, not all elements in every figure are labeled with reference symbols. When relative terms such as "left" or "right" are used in the description, they refer to the figures described. Only the terms "front," "back," "top," and "bottom" refer to the natural orientation of the pull-out rail during operation, where a cooking tray rests on top of the pull-out rail and the front end of the pull-out rail points toward a user standing in front of the appliance in which the pull-out guide is used.

[0023] In the Figures 1a-1cA first example of a non-inventive extraction guide is shown.

[0024] The drawer guide has a fixed cabinet rail 1, which can be fixed in or on a household appliance using mounting elements, for example, mounting clips 11. The drawer guide 1 is designed for a cooking appliance with a food carrier, e.g., a baking tray 6 (see figure). Figure 1c ), suitable. The mounting brackets 11 can in this case be attached to a side rack, which is typically located in the cooking chamber of the cooking appliance.

[0025] The drawer slide comprises a running rail 2, which is mounted to move relative to the cabinet rail 1. In the illustrated example, the cabinet rail 1, the running rail 2, and the mounting brackets 11 are all made of metal, e.g., from appropriately stamped and bent sheet metal. Between the cabinet rail 1 and the running rail 2 is an arrangement of rolling elements (not visible here) that allows the running rail 2 to move smoothly relative to the cabinet rail 1. Additional components, such as further running rails or center rails, can also be arranged between the cabinet rail 1 and the running rail 2 to allow for drawer extension.

[0026] In Figure 1a The drawer guide is shown in an assembled state with a plug 3 in the front area of ​​the running rail 2 and a stop element 4 in the rear area of ​​the running rail 2. Figure 1bThe plug 3 and the stop element 4 are shown separately from the extension guide. Figure 1c Finally, the extension guide in the assembled state with a partially shown baking tray placed on top shows 6.

[0027] The plug 3 is fixed at a front end of the guide rail 2. In this example, it has an insertion element 31 that is inserted into the essentially U-shaped profile of the guide rail 2. After the insertion element 31 is inserted, the plug 3 rests against the front end of the guide rail 2 with a contact element 32 that projects laterally and, in particular, upwards beyond the insertion element 31. The contact element 32 prevents the placed baking tray 6 from sliding forward off the guide rail 2.

[0028] In contrast to the guide rail 2, which is made of metal, the plug 3 and, in particular, the contact element 32 are made of an electrically insulating material, such as the plastic PEEK (polyetheretherketone). This contact element 32 of the plug 3 separates the metal of the guide rail 2 from a door, flap, or other front panel of the microwave oven. This prevents a potential arcing of sparks between the front end of the guide rail 2 and the front panel. Microwave ovens often use a door or flap with a glass front panel that is equipped with conductive elements, such as a conductive coating or wires embedded in the glass. The material of the contact element 32 or the plug 3 can also be shock-absorbing and / or thermally insulating, thus protecting the door or flap mechanically and with regard to local thermal stresses.

[0029] In this example, plug 3 is made in one piece, for example from plastic, e.g. the already mentioned PEEK, manufactured in an injection molding process.

[0030] In the front area of ​​the guide rail 2, two recesses 21 are formed in the material of the guide rail 2, into which, for example, locking elements of the insertion body 31 engage, so that the plug 3 is secured to the guide rail 2 after insertion. However, it is also possible to secure the inserted plug 3 to the guide rail 2 by lowering a web 211 remaining between the two recesses 21.

[0031] Another special feature of the plug 3 in this example is a support section 33, which, extending from the mounting element 32, rests on the guide rail 2 when the plug 3 is inserted. The support section 33 is adapted to the shape of the guide rail 2 and at least partially encompasses it (in this case, in the area of ​​the lateral chamfers of the guide rail 2) in order to be laterally fixed to the guide rail 2 and to provide a larger support surface for the baking tray 6. The support section 33 is provided with longitudinal ribs 331 along its upper edge. In addition, a guide pin 332 projects vertically beyond the longitudinal ribs 331. The support section 33, which is also made of the insulating material, electrically insulates the baking tray 6 from the guide rail 2, thus preventing arcing between these two parts.

[0032] A stop element 4 is placed on the rear end of the guide rail 2. This stop element 4 provides an upwardly projecting stop 42 and a further support section 43. The guide rail 2 is provided with a bore 22 for attaching the stop element 4. The stop element 4 has a mounting element 41, for example, a pin, hook, or tab (not shown here), which engages in the bore 22 and may be equipped with locking mechanisms, so that the stop element 4 is held on the guide rail 2. Instead of a pin, a screw connection or a rivet engaging in the bore 22 can also be used to secure the stop element. In this case, the screw head or rivet head is located in a recess in the stop element 4 to be spaced away from the baking tray 6, thus maintaining the insulation between the baking tray 6 and the guide rail 2.

[0033] The underside of the stop element 4, which is adapted to the shape of the running rail 2, also serves to secure the stop element 4 to the running rail 2. This profiling, in particular the areas that partially encompass the running rail 2 laterally, can also be understood as a mounting means 41. The further support section 43 is provided with longitudinal webs 431, similar to the support section 33 of the plug 3.

[0034] As in Figure 1c As can be seen, the baking tray 6 rests with a rim 61 on the support sections 33 and 43, and in particular on the longitudinal webs 331 and 431. In contrast to the guide rail 2, which is made of metal, the plug 3 and the stop element 4 are made of an electrically insulating material, for example the aforementioned plastic PEEK, so that the placed baking tray 6 is completely electrically insulated from the metal of the extension guide.

[0035] The plug 3 and the stop element 4 can also have a noise-dampening effect. To optimize noise dampening, parts of the plug 3 and / or the stop element 4 can also be made of a softer component than the base material. For example, the longitudinal webs 331 and 431 can be made of a softer silicone material that is injection-molded or bonded on.

[0036] The baking tray 6 has openings 62 in its rim 61, with the guide pin 332 of the plug 3 engaging in the front of the openings 62, thus positioning the baking tray 6 when it is placed on the tray and, in particular, fixing it laterally. At the rear of the baking tray 6, its outer edge 63 rests against the stop 42 of the stop element 4. Alternatively, the baking tray 6 can also be positioned on the guide rail 2 by means of a crimped edge or a surrounding wire of a grid-shaped baking tray, against the elements of the plug 3 and / or the stop element 4.

[0037] In the Figures 2a-c Figure 1 shows another example of a non-inventive drawer slide. This drawer slide also has a plug 3 and a stop element 4. Figure 2aThe drawer guide is shown with the plug 3 and stop element 4 removed, as well as a baking tray 6 to be placed on top. Figure 2b The baking tray 6 is shown placed on the two pull-out guides shown here. Figure 2c This is a detailed representation of the rear support area of ​​the baking tray 6 on the pull-out guide.

[0038] The construction of the drawer slide in this second example, with cabinet rail 1 and running rail 2, is fundamentally comparable to that of the first example. Unlike the first example, there is no hole at the rear end of running rail 2 for attaching the stop element 4; instead, a metallic stop bolt 23 is attached to running rail 2, in particular by welding.

[0039] The plug 3, fixed at the front end of the guide rail 2, corresponds to that of the first example, to whose description reference is made. The stop element 4, which is inserted in the rear area of ​​the guide rail 2, differs from that of the first example. It also has a support section 43 on which the baking tray 6 is positioned with its rim 61. Behind the support section 43, a stop 42 is formed, which here has the shape of a hollow cylindrical protrusion that forms a cap with which the stop element 4 is placed onto the stop bolt 23 of the guide rail 2. The stop element 4 can be fastened to the stop bolt 23 by positive or frictional engagement. Additionally, a locking element 41, which engages the rim of the guide rail 2, can be formed at the rear end of the stop element 4 as a mounting means.

[0040] The stop element 4 of the second example, like the plug 3 and the stop element 4 of the first example, can be made of an insulating material, for example, PEEK. It is also conceivable that a softer material, such as silicone, is used in the area of ​​the support section 43. As in the first example, the placement of the baking tray 6 on the support section 33 or 43 of plug 3 or stop element 4 provides electrical, and optionally also thermal or sound-insulating, insulation between the baking tray 6 and the guide rail 2, and, through the contact element 32, between the guide rail 2 and a door, flap, or other front panel of the appliance.

[0041] In the Figures 3a and 3b This is a further development of the second example. In terms of its basic structure, the extract format corresponds to that of the second example according to the... Figures 2a-c. Figure 3ashows the pull-out guide with the plug 3 removed and the stop element 4 lifted off. Figure 3b shows the compound pull-out guide with a partially depicted baking tray placed on top 6.

[0042] In this third example, the plug 3 again corresponds to one of the previously described examples. The stop element 4 is constructed similarly to that of the second example. As before, the stop element 4 is provided with a hollow cylindrical protrusion that forms a cap with which the stop element 4 is placed onto the stop bolt 23 of the guide rail 2. Additionally, a damping cap 44 is provided, which is placed onto the stop 42 of the stop element 4. This damping cap 44 is preferably made of a softer material, for example, silicone, so that the impact of the baking tray 6 against the stop element 4 is dampened even more effectively.

[0043] Another example of a non-inventive extraction guide is found in the Figures 4a and 4b in an analogous manner as in the Figures 3a and 3b reproduced.

[0044] The basic structure of the drawer guide corresponds to that of the second and third examples; a stop bolt 23 is attached to the running rail 2.

[0045] A damping cap 44 is directly attached to this stop bolt 23. This cap is similar in design to the one in the third example, except for its reduced inner diameter, allowing it to be fixed directly onto the stop bolt 23 in a form-fit and friction-fit manner. This does not provide insulation along the edge 61 of the baking tray 6, but it does dampen the impact of the edge 63 of the baking tray 6 against the stop bolt 23.

[0046] Unlike the examples shown previously, a plug 3 is arranged in the front area of ​​the guide rail 2, which provides a support element 32 but not a rest for the baking tray 5. This plug 3 therefore also does not provide insulation between the guide rail 2 and the baking tray 6, but, as in the previous examples, it does provide insulation between the guide rail 2 and the front of the appliance.

[0047] In the Figures 5a and 5b A further development of the fourth example is shown. The extract format is fundamentally the same as that of the fourth example, according to the... Figures 4a and 4b . Similarly, as in the fourth example, a damping cap 44 is placed on a stop bolt 23 of the guide rail 2. In this way, a rear stop of a placed cooking tray (not shown here) against the guide rail 2 is dampened.

[0048] The plug 3 is modified compared to the one in the fourth example by the inclusion of a damping element 321 in the upwardly projecting section of the side of the support element 32 facing the guide rail 2. The damping element 321 essentially fills the projecting area of ​​the support element 32 and is connected to it via a plug-in pin. The support element 32 has a bore for receiving the plug-in pin. The damping element 321 dampens the impact of the edge 63 of the baking tray 6, even in the front area of ​​the guide rail 2. A soft plastic, particularly silicone, can be used as the material for the damping element 321. Alternatively, the damping element 321 can also be bonded to the support element 32.

[0049] In the Figures 6a-c Another example of a non-inventive extraction guide is shown. Figures 6a and 6bThe assembled drawer slide is shown in an isometric overall view, once without a baking tray ( Figure 6a ) and once with a baking tray placed on top ( 6 ( Figure 6b ).

[0050] The basic structure of the drawer slide with cabinet rail 1 and running rail 2 corresponds again to the structure of the drawer slides shown previously.

[0051] A stop element 4 is inserted in the rear area of ​​the running rail 2, which in this configuration was already used in the third example in the Figures 3a and 3b shown.

[0052] In the example of the Figures 6a-c An alternative design of a plug 3 for use with a drawer guide is shown. Figure 6c Plug 3 is shown separately in two isometric views from different viewing directions.

[0053] Unlike the plug 3 described in the previous examples, this plug 3 is designed according to the Figures 6a-cThis plug 3 is not inserted into the front end of the guide rail 2, but rather placed on top of it. Like the plugs described previously, this plug 3 is made in one piece from an insulating material, such as PEEK or another suitable plastic. As with the examples described above, the plug 3 provides electrical insulation between the guide rail 2 and a door, flap, or other front panel of the microwave oven, and between the guide rail 2 and the baking tray 6 placed on it.

[0054] The plug 3 has an approximately C-shaped base body 34 that at least partially encompasses the guide rail 2. The base body 34 can be made of a sufficiently elastic material so that it can also be clipped around the guide rail 2 from the side.

[0055] A projection 341 is arranged on a laterally located inner surface of the base body 34, which engages in a corresponding recess or bore on the guide rail 2, thereby fixing the plug 3 in the longitudinal direction. However, the positive locking mechanism and the projection 341 provided for this purpose can also be omitted if the plug 3 and guide rail 2 are adapted to each other in such a way that the plug 3 is fixed by friction.

[0056] On the outer upper surface of the base body 34, a support section 33 is formed for the edge of a placed baking tray. This is comparable to the plug 3 according to the Figures 1a-3b Longitudinal webs 331 and a guide pin 332 are formed, which positions the placed baking tray and fixes it laterally.

[0057] In an alternative design of the in the Figures 6a-cIn the example shown, the plug 3 can be formed by two separate parts, both of which have a base body 34 for mounting on the guide rail 2. The front part comprises the contact element 32 and the rear part comprises the support section 33.

[0058] In the Figures 7a-11c Further examples of plugs 3 are shown below, which can be inserted into the front end of a guide rail 2 of a drawer slide and which insulate this front end of the guide rail 2 from a door or flap of a household appliance with a microwave cooking function. In the figures mentioned, only a front section of the guide rail 2 is shown in each case. The drawer slide can be designed, for example, analogously to the drawer slides shown in the examples described above.

[0059] In the Figures 7a, b and 8a, bTwo further examples of one-piece plugs 3 are shown. Figures 7a Figures 8a and 8a show the plug 3 before insertion into the guide rail 2 and the Figures 7b or 8b insert the plug 3 into the running rail 2.

[0060] For example, the Figures 7a, b Is plug 3 similar to the one in the Figures 4a, b The plug shown is designed as follows. Unlike the example shown there, here the plug 3 is attached to the front end of the guide rail 2 by a purely clamping mechanism. The insertion body 31 of the plug 3 has projections 311, in this case in the form of ribbing, along the four longitudinal edges of the insertion body 31.

[0061] For example, the Figures 8a, b Instead of the ribbing, a raised area 311 in the form of a curved projection is arranged on one or both sides of the insertion body 31.

[0062] The example of the Figures 9a-cThe plug 3 shown, unlike the previously described two-part plugs, has an insertion body 31 that is connected to a contact element 32. In contrast to the previously shown examples, the insertion body 31 and the contact element 32 are therefore not integrally formed together.

[0063] In Figure 9a The illustration shows, in the form of an exploded view, the insertion body 31 before being inserted into the front end of the running rail 2 and the attachment element 32 before its connection with the insertion body 31. Figure 9b The diagram shows the attachment element 32 placed on the insertion body, but the plug 3 thus formed is not yet inserted into the running rail 2. Figure 9c Finally, the plug 3 is shown inserted into the front end of the running rail 2.

[0064] To connect the attachment element 32 with the insertion body 31, the attachment element 32 has a rectangular opening 322 in this example, into which a pin 312 of the insertion body 31 is inserted when the two elements are joined. This can be done, for example, by clamping the attachment element 32 and the insertion body 31 together.

[0065] One advantage of the two-part design of the plug 3 lies in the possibility of using different materials for the insertion body 31 and the contact element 32. For example, the contact element 32 can be made of a ceramic material, thus achieving good insulation and shielding with regard to preventing flashover. The insertion body 31 can be made of a plastic material that is elastic, unlike ceramic. The elasticity of the plastic allows for a good frictional connection between the insertion body 31 and the contact element 32. In addition, the insertion body 31, with its pin 312, projects forward beyond the contact element 32, thereby providing mechanical damping between the front end of the guide rail 2 and a door or flap of the household appliance.In addition to a purely clamping connection between the pin 312 and the mounting element 32, it can also be provided that the pin is thermally deformed after being inserted through the opening 322 of the mounting element 32, so that a positive fit is created.

[0066] To secure the plug 3 in the guide rail 2, a groove 313 is formed on the upper side of the insertion body 31 in the example shown. The guide rail 2 has a die-cut web 24 at its front end, which is angled slightly downwards. When the plug 3 is inserted into the front end of the guide rail 2, the web 24 engages in the groove 313, thus securing the plug 3. The web 24 can be pre-bent so that the plug 3 can be inserted with a snap-in mechanism. It is also conceivable that the web 24 is die-cut during the manufacturing process of the guide rail 2 but not angled downwards. The plug 3 can then be inserted into the front end of the guide rail 2, after which the web 24 is bent downwards with the plug 3 already inserted to secure the plug 3.

[0067] In the Figures 10a-c is another example of a two-part stopper 3 in the same way as in the Figures 9a-cillustrated. In contrast to the example of Figures 9a-c The insert body 31 has laterally arranged grooves 314. The mounting element 32 in turn has an opening 322, which in this case is open downwards. As in the Figure 10b As can be seen, for mounting the plug, the mounting element 32 is inserted with the edges of the opening 322 into the lateral grooves 314 of the insertion body 31. The resulting plug 3 is then inserted into the front end of the guide rail 2, whereby in the example shown here a purely clamping, friction-fit connection between the plug 3 and the guide rail 2 is provided.

[0068] In the Figures 11a-c is in the same way as in the Figures 10a-c A modified embodiment is shown. The basic structure corresponds to that of the example of the Figures 10a-cIn contrast, in the case of the insert body 31, the section of the insert body 31 projecting forward over the mounting element 32 has a larger cross-section than the rear section, which is inserted into the running rail 2.

[0069] In the Figures 12a to 17c Three exemplary embodiments of drawer slides according to the invention are shown, which are further developments of the fourth example of a drawer slide according to the Figures 4a, b To illustrate. For all three embodiments, the basic structure of the drawer slide with cabinet rail 1 and running rail 2 corresponds to the structure of the previously shown drawer slides, to which explicit reference is hereby made.

[0070] Only the front section of each drawer slide, into which a plug 3 is inserted, is shown. The opposite end section can, for example, be designed with a rear stop for a gargoyle support (also not shown), as described previously.

[0071] All three examples of the Figures 12a to 17c The common feature is that a contact element 35 is arranged in or on the plug 3, which electrically connects the end sections 25 of the legs of the u-shaped running rail 2 when the plug 3 is inserted into the guide rail 2.

[0072] This is based on the understanding that microwaves can penetrate the essentially U-shaped guide rail from the front through the plug 3 if it is made of an insulating material. Within the guide rail 2, the microwaves are then propagated by reflection until they encounter an obstacle, usually a rolling element cage of the drawer slide. There, they release their energy, leading to unnecessary and undesirable heating of the rolling element cage and a reduction in the efficiency of the microwave oven. It has been shown that electrically contacting the end sections 25 of the guide rail 2 effectively prevents microwaves from penetrating the volume enclosed by the guide rail 2. Contacting that is positioned as close as possible to the edge, both in the direction of extension and towards the free ends of the legs of the U-shaped guide rail 2, has proven particularly effective.

[0073] In the Figures 12a-c and 13a, b A first embodiment of such an extension rail according to the invention with plug 3 and contact element 35 is shown.

[0074] The Figures 12a, b Each figure shows a section of the body rail 1 and the running rail 2, as well as the plug 3 before it is inserted into the front end of the running rail 2. Recesses 315 are provided laterally and from below in the insertion body 31 of the plug 3, into which the Figure 12a A contact element 35, shown separately, is used. In this embodiment, the contact element 35 is a U-shaped bent wire section.

[0075] The Figures 12b and 13a The contact element 35, inserted into the insert body 31, is shown from two different perspectives. Finally, in the Figures 12c and 13bThe insert body 31 is inserted into the guide rail 2. It can be seen that the contact element 35 connects the free end sections 25 of the legs of the U-shaped guide rail 2. In the end region, the profile of the guide rail 2 is thus electrically closed, thereby forming effective shielding against microwaves. It is evident that the shielding effect against the penetration of microwaves is as effective, or at least almost as effective, as if the front end of the guide rail 2 were completely sealed with an electrically conductive material.

[0076] In the Figure 14a , b and 15 ac A second embodiment of an extractor guide according to the invention, with plug 3 and contact element 35, is shown. The illustration of the Figures 14a, b corresponds to the Figures 12b , c. In the Figures 15a, bThe plug 3 is shown separately in a three-dimensional representation before and with the contact element 35 mounted. Figure 15c shows a cross-sectional view through the guide rail 2 with the plug 3 inserted.

[0077] In contrast to the previously described embodiment of the Figures 12a to 13b Here, the contact element 35 is also a U-shaped bent sheet metal, not a wire segment. Accordingly, the recesses 315 in the insertion body 31 are wider. In principle, a comparable effect results as in the previously described embodiment, whereby the greater width of the sheet metal, compared to the wire segment, leads to more reliable contact between the contact element 35 and the end sections 25 of the legs of the guide rail 2. Depending on the length of the individual legs of the U-shaped guide rail 2, the contact element 35 can be positioned as shown in Fig. 15cshown, deviating from a symmetrical u-shape in order to connect the end sections 25 of the legs in the shortest way.

[0078] Finally, in the Figures 16a to 17c in a similar way as in the Figures 14a to 15c A third embodiment of an extractor guide according to the invention with plug 3 and contact element 35 is shown.

[0079] In this embodiment, a U-shaped sheet metal is used as a contact element 35, similar to the previous embodiment. However, unlike the previous embodiment, the legs of the U-shaped contact element 35 are oriented in the extension direction and not perpendicular to it. The recesses 315 on the insertion body 31 are also aligned accordingly.

[0080] An advantage of this design is that even larger clamping forces (leading to improved contact between the contact element 35 and the guide rail 2) can be applied without the risk of the contact element 35 being forced out of the recesses 315 when inserted into the guide rail 2. To achieve particularly good electrical contact, in this embodiment the contact element 35 is additionally provided with an outward bend 351 at each of its two free ends. The bends 351 constitute the main contact points with the guide rail 2, which are preferably located in the front region of the end section 25. A stop tab 316 integrated in the rear region of the plug 3 prevents, on the one hand, the pre-assembled contact element 35 from falling out of the recess 315 during assembly and, on the other hand, prevents contact between the contact element 35 and other guide elements, such as the cabinet rail 1 or center rail. Reference symbol list

[0081] 1body rail 11mounting bracket 2Running rail 21Recess 211Web 22Bore 23Stop bolt 24Web 25End section 3 Plug 31 Insertion body 311 Raise 312 Pin 313 Groove 314 Side groove 315 Recess 316 Stop tab 32 Mounting element 321 Damping element 322 Opening 33 Support section 331 Longitudinal web 332 Guide pin 34 Base body 341 Projection 35 Contact element 351 Angle 4 Stop element 41 Mounting device 42 Stop 43 Support section 431 Longitudinal rib 44 Damping cap 6 Baking tray 61 Edge 62 Opening 63 Edge

Claims

1. Pull-out guide for a domestic appliance with microwave cooking function, having a cabinet rail (1) and at least one metallic running rail (2), which can be moved relative thereto, for depositing a food carrier, wherein the at least one running rail (2) has a substantially U-shaped profile with two legs and wherein a stopper (3) is arranged in a front region of the running rail (2) as seen in the pull-out direction, which stopper has a contact element (32) for the food carrier projecting forwards and upwards over the running rail (2), characterized in that the stopper (3) is at least partially made from an electrically insulating material and that a contact element (35) is arranged in the stopper (3), which electrically contacts two end sections (25) of the legs of the running rail (2) with each other.

2. Pull-out guide according to claim 1, in which the insulating material is also thermally insulating and / or shock-absorbing.

3. Pull-out guide according to claim 1 or 2, in which the stopper (3) has an insertion body (31) which is inserted into a front end of the running rail (2).

4. Pull-out guide according to claim 3, in which the insertion body (31) is attached to the running rail (2) in a clamping and / or latching manner.

5. Pull-out guide according to claim 3 or 4, in which a section of the running rail (2) is formed, in particular countersunk, in the front region in order to fasten the insertion body (31) in a form-fitting or force-fitting manner.

6. Pull-out guide according to claim 5, wherein the running rail (2) has a punched-out web (24, 211) which is formed.

7. Pull-out guide according to claim 1 or 2, in which the stopper (3) has a C-shaped base body (34) which is plugged onto the running rail (2).

8. Pull-out guide according to claim 7, in which the base body (34) is fastened to the running rail (2) in a clamping and / or latching manner.

9. Pull-out guide according to claim 7 or 8, in which the base body (34) has a projection (341) which engages in a hole or recess in the running rail (2).

10. Pull-out guide according to one of claims 1 to 9, in which the stopper (3) has a support section (33) for the food carrier which is aligned parallel to the pull-out direction and projects upwards over the running rail (2).

11. Pull-out guide according to claim 10, in which the support section (33) of the stopper (3) has longitudinal webs (331) on which the food carrier can rest.

12. Pull-out guide according to claim 10 or 11, in which an upwardly projecting guide pin (332) for the food carrier is arranged in the region of the support section (33) of the stopper (3).

13. Pull-out guide according to one of claims 1 to 12, comprising a stop element (4) which is mounted on the running rail (2) in a rear region as seen in the pull-out direction and has a stop (42) for the food carrier projecting upwards over the running rail (2).

14. Pull-out guide according to claim 13, in which the stop element (4) has a further support section (43) for the food carrier which is aligned parallel to the pull-out direction and projects upwards over the running rail (2).

15. Domestic appliance with microwave cooking function, comprising at least one pull-out guide according to one of claims 1 to 14 for accommodating a food carrier.

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