Household appliance and pull-out mechanism for a household 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] Household appliance and drawer guide for a household appliance

[0002] The invention relates to a pull-out guide for a household appliance with a microwave cooking function, comprising a body rail and at least one metal guide rail movable relative thereto for depositing a food support. A plug is arranged in a front region of the guide rail, as seen in the pull-out direction, which plug has a support element for the food support that projects forward and upward over the guide rail. The invention further relates to a household appliance with a microwave cooking function having such a pull-out guide.

[0003] Drawer runners have become established in a wide variety of household appliances. Removable supports can be placed on them. These supports can be conveniently pushed into the appliance through the drawer runner and then pulled out, making them easier to remove. The plug located at the front end can be designed with a molded-on contact element or a separate contact element and sometimes serves to cover the guide rail for aesthetic reasons and to prevent sharp edges at the front that could cause injury. The contact element also prevents the support from slipping off the guide rail. In cooking appliances, such supports include food supports such as baking trays or wire racks.

[0004] Typically, both the runners of the drawer slides and the food supports are made of a metallic material. The metal-on-metal arrangement is electrically conductive and also a good heat conductor, which can be problematic in cooking appliances, especially microwave ovens. Electrical contact between the drawer slide and the front panel of a microwave oven, which usually has a conductive coating, is also unfavorable due to the potential for sparking.

[0005] To prevent electrical contact, it is known in microwave cooking appliances to provide the food supports and / or the guide rails of the pull-out guide with an electrically insulating coating, such as a ceramic coating. However, such a coating is susceptible to scratching. German patent document DE 102 11 470 A1 discloses a pull-out guide for a cooking appliance that is at least partially coated with PTFE (polytetrafluoroethylene). The coating makes the pull-out guide easier to clean and offers advantages in terms of the smooth running of the pull-out system, as this coating also dampens noise.

[0006] However, due to their low layer thickness, both the PTFE coating mentioned above and a ceramic coating are only suitable to a limited extent for electrically insulating the pull-out guide from a door or the front panel of a microwave oven in such a way that arcing is reliably prevented.

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

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

[0009] A pull-out guide according to the invention of the type mentioned at the outset is characterized in that the plug is made at least partially of an electrically insulating material. Instead of or in addition to a coating of the guide rail, effective protection against arcing from the guide rail to the front of the microwave cooking appliance is achieved by the plug, in particular by the contact element, which covers the guide rail at the front and preferably also covers it on all sides and which is made at least partially of an electrically insulating material. The resulting distance between the metallic guide rail and the front prevents arcing. This is particularly effective when the contact element projects beyond the guide rail on all sides.This is already the case upwards due to its function as a stop for the food carrier, and even a small overhang to the left, right and bottom is an effective means of preventing tipping over.

[0010] The electrically insulating materials listed below can be used, among others: ceramics, high-temperature-resistant thermoplastics, in particular from the polyether ketone family (e.g. polyether ether ketone - PEEK) and / or elastomers, in particular from the polysiloxane or thermoset family.

[0011] In a preferred embodiment, at least the contact element is made of the electrically insulating material. Since it is part of the plug arranged at the front of the guide rail, it can be made of an insulating material and yet be easily mounted on the guide rail. By inserting the plug into the guide rail or partially enclosing it, a frictional or positive connection can be created between the plug and the guide rail, through which the contact element is attached to the guide rail. The material of the plug or the contact element can also be thermally insulating and / or shock-absorbing in order to protect the front of the household appliance mechanically and against local thermal stresses.

[0012] It is noted that a plug within the meaning of the application is an element that can be inserted into the guide rail from the front or from a side, or that can be clipped onto the guide rail from the front or from a side. In one embodiment of the pull-out guide, the plug then comprises an insert body that can be inserted into the front end of the guide rail. In a further embodiment, instead of the insert 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 encompass the guide rail and, if necessary, also to be able to be clipped on from the side.

[0013] In both cases, the fastening to the running rail can be clamped, latched and / or materially bonded, in particular by thermal joining. In the embodiment with the insert body, a positive fastening can additionally or alternatively be achieved by forming, in particular countersunk, a section of the running rail in the front area after the insert body has been inserted into the running rail. For example, the running rail can have a punched-out web which is pressed in for the forming process 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 which engages in a hole or recess in the running rail. The plug can be formed in one piece or at least in two parts, wherein in the latter case at least the contact element is not formed integrally with the insert body orthe base body. The two-part or multi-part design offers the option of making the contact element from a different material than the insert body or the base body. For example, the contact element can be made from ceramic, while the insert body is made from plastic. The elasticity of the plastic enables a good frictional connection to be achieved between the insert body and the guide rail, i.e. the plug can be securely fastened in the guide rail. The ceramic material of the contact element offers good electrical insulation and represents particularly good protection against arcing. However, it is also conceivable to make the insert body from the electrically insulating material, in particular from a ceramic or PEEK, and the contact element from a different material.

[0014] In an advantageous embodiment of the pull-out guide, the plug also has a support section for the food support, aligned parallel to the pull-out direction and projecting upwards above the guide rail. The plug thus serves as a support for the food support and can electrically insulate the food support from the guide rail. A guide pin for the food support can also be arranged in the area of ​​the support section of the plug, projecting upwards. If the guide pin engages in a corresponding recess or depression in the food support, it is also secured laterally and / or in the pull-out direction.

[0015] In a further advantageous embodiment, the pull-out guide has a stop element which is mounted on the guide rail in a rear area as seen in the pull-out direction and which has a stop for the food support which projects upwards above the guide rail. The stop element preferably has a further support section for the food support which is aligned parallel to the pull-out direction and projects upwards above the guide rail. The food support therefore rests on the support section of the plug in the front area and on the further support section of the stop element in the rear area. If the support section of the plug and the further support section have the same thickness, the food support 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.In this case, even with a level alignment of the food support, an inclination of the pull-out guide can be provided, which, for example, prevents or facilitates the pull-out guide from sliding in and out without tipping the food support. Preferably, the stop element as a whole, or at least the further support section, is made of an insulating material, so that the food support is then completely electrically insulated from the guide rail.

[0016] Furthermore, the stop can be formed by a protrusion, with which the stop element is placed on a stop pin located on the guide rail. Such stop pins are often standard on guide rails and can then be advantageously used as a fastening option for the stop element. A damping cap made of a material that is softer than the protrusion can also be placed on the protrusion. This results in a noise-dampened stop and a soft landing of the food support.

[0017] In a further advantageous embodiment, the guide rail of the pull-out guide has a substantially U-shaped profile with two legs, wherein a contact element is arranged on or in the plug, which electrically contacts two end sections of the legs of the guide rail with each other.

[0018] This is based on the realization that microwaves can penetrate the U-shaped guide rail through the plug from the front if the guide rail is made of an insulating material. Within the guide rail, the microwaves are then reflected until they encounter an obstacle, such as a roller cage. There, they release their energy, which leads to unnecessary and undesirable heating of the obstacle and thus of the drawer guide. The electrical contact between the end sections of the guide rail and the contact element effectively prevents the microwaves from penetrating the volume enclosed by the guide rail.

[0019] A household appliance with a microwave cooking function according to the invention is characterized by having at least one such pull-out guide. This results in the advantages mentioned in connection with the pull-out guide.

[0020] The invention is explained in more detail below using exemplary embodiments and figures. The figures show:

[0021] Fig. 1a is an isometric view of a drawer guide with a front plug and a rear stop element; Fig. 1b shows the drawer guide of Fig. 1a with the plug or stop element removed;

[0022] Fig. 1c shows the pull-out guide of Figures 1a, b with a baking tray placed on it;

[0023] Fig. 2a is an isometric view of a pull-out guide in a further embodiment with removed plugs or stop element and a section of a baking tray to be placed on top;

[0024] Fig. 2b Drawer guides according to Figure 2a with baking tray placed on top;

[0025] Fig. 2c shows a detailed view from Figure 2b;

[0026] Fig. 3a, b a pull-out guide in a further embodiment with dismantled plugs or stop element (Fig. 3a) and assembled with a baking tray placed on top (Fig. 3b);

[0027] Fig. 4a, b a pull-out guide in a further embodiment with dismantled plugs or stop element (Fig. 4a) and assembled with a baking tray placed on top (Fig. 4b);

[0028] Fig. 5a, b a pull-out guide in a further embodiment in an isometric overall view (Fig. 5a) and a detailed view of its front section (Fig. 5b);

[0029] Fig. 6a, b a pull-out guide in a further embodiment without (Fig. 6a) and with a baking tray placed on top (Fig. 6b);

[0030] Fig. 6c two isometric detailed views of the plug of the pull-out guide of Fig. 6a, b;

[0031] Fig. 7a, b show representations of a front section of a pull-out guide in a further embodiment with the plug removed (Fig. 7a) and inserted (Fig. 7b) respectively; Fig. 8a, b show representations of a front section of a pull-out guide in a further embodiment with the plug removed (Fig. 8a) and inserted (Fig. 8b) respectively;

[0032] Fig. 9a-c representations of a front section of a pull-out guide in a further embodiment with removed (Fig. 9a, b) or inserted (Fig. 9c) plug;

[0033] Fig. 10a-c representations of a front section of a pull-out guide in a further embodiment with removed (Fig. 10a, b) or inserted (Fig. 10c) plug;

[0034] Fig. 11a-c representations of a front section of a pull-out guide in a further embodiment with removed (Fig. 11a, b) or inserted (Fig. 11c) plug;

[0035] Fig. 12a-c representations of a front section of a pull-out guide in a further embodiment with removed (Fig. 12a, b) or inserted (Fig. 12c) plug;

[0036] Fig. 13a, b Representation analogous to Fig. 12b and 12c from a different angle;

[0037] Fig. 14a, b representations of a front section of a pull-out guide in a further embodiment with removed (Fig. 14a) or inserted (Fig. 14b) plug;

[0038] Fig. 15a-c different representations of the plug (Fig. 15a, b) or the guide rail with inserted plug (Fig. 15c) according to Figs. 14a, b;

[0039] Fig. 16a, b representations of a front section of a pull-out guide in a further embodiment with the plug removed (Fig. 16a) or inserted (Fig. 16b); and

[0040] Fig. 17a-c various representations of the plug (Fig. 17a, b) or the guide rail with inserted plug (Fig. 17c) according to Figures 16a, b. In all figures, the same reference symbols identify the same or similarly acting elements. For reasons of clarity, not all elements are provided with reference symbols in all figures. If relative terms such as “left” or “right” are used in the description, these refer to the figures described. Only the terms “front”, “rear”, “top” and “bottom” refer to the natural orientation of the pull-out rail during operation, with a food carrier resting on top of the pull-out rail and the front end of the pull-out rail pointing towards a user who is in front of the household appliance in which the pull-out guide is used.

[0041] Figures 1 a-1 c show a first embodiment of a pull-out guide according to the application.

[0042] The pull-out guide has a stationary cabinet rail 1, which can be secured in or to a household appliance using mounting elements, for example, mounting clamps 11. The pull-out guide 1 is suitable for a cooking appliance with a food support, e.g., a baking tray 6 (see Figure 1c). In this case, the mounting clamps 11 can be mounted on a side grille, which is typically located in the cooking chamber of the cooking appliance.

[0043] The drawer guide comprises a guide rail 2, which is mounted so that it can move relative to the cabinet rail 1. In the example shown, the cabinet rail 1, the guide rail 2, and the mounting brackets 11 are made of metal, e.g., from appropriately punched and bent sheet metal. Between the cabinet rail 1 and the guide rail 2 is an arrangement of rolling elements (not visible here), which allows the guide rail 2 to move easily relative to the cabinet rail 1. Additional components, such as additional guide rails or center rails, can also be arranged between the cabinet rail 1 and the guide rail 2 to enable a drawer extension.

[0044] Figure 1a shows the pull-out guide in an assembled state with a plug 3 in the front area of ​​the guide rail 2 and a stop element 4 in the rear area of ​​the guide rails 2. Figure 1b shows the plug 3 and the stop element 4 separate from the pull-out guide. Figure 1c shows the pull-out guide in its assembled state with a baking tray 6 partially shown placed on it. The plug 3 is secured to a front end of the guide rail 2. In this exemplary embodiment, it has an insert body 31 which is inserted into the essentially U-shaped profile of the guide rail 2. After the insert body 31 has been inserted, the plug 3 rests against the front end of the guide rail 2 with a contact element 32 which projects laterally and in particular upwardly beyond the insert body 31. The contact element 32 prevents the placed baking tray 6 from slipping forward off the guide rail 2.

[0045] 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, for example the plastic PEEK (polyetheretherketone). Thus, the contact element 32 of the plug 3 separates the metal of the guide rail 2 from a door, flap, or other front of the microwave cooking appliance. This prevents an otherwise possible arcing between the front end of the guide rail 2 and the front. Microwave cooking appliances often use a door or flap with a front pane provided with conductive elements, for example, a conductive coating or wires 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 against local thermal stress.

[0046] In this embodiment, the plug 3 is formed in one piece, for example from plastic, e.g. the already mentioned PEEK, produced in an injection molding process.

[0047] 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 fasten the inserted plug 3 to the guide rail 2 by countersinking a web 211 remaining between the two recesses 21.

[0048] A further special feature of the plug 3 in this exemplary embodiment is a support section 33 which, starting from the contact element 32, rests on the guide rail 2 when the plug 3 is inserted. Towards the guide rail 2, the support section 33 is adapted to the shape of the guide rail and at least partially encompasses it (in this case in the area of ​​lateral bevels of the guide rail 2) in order to be fixed laterally to the guide rail 2 and to achieve a larger support surface for the baking tray 6. At the top, the support section 33 is provided with longitudinal webs 331. In addition, a guide pin 332 projects vertically beyond the longitudinal webs 331. The support section 33, which is also made of the insulating material, electrically insulates the baking tray 6 from the guide rail 2, which prevents arcing between these two parts.

[0049] A stop element 4 is placed on the rear end of the guide rail 2, providing an upwardly projecting stop 42 and a further support section 43. To fasten the stop element 4 to the guide rail 2, the latter is provided with a bore 22. The stop element 4 has a mounting means 41, for example a pin, hook, or tab (not visible here), which engages in the bore 22 and which can be provided with locking means so that the stop element 4 is held on the guide rail 2. Instead of a pin, a screw connection can also be used to secure the stop element, or a rivet that engages in the bore 22. In this case, the screw head or rivet head is accommodated in a recess in the stop element 4 in order to be spaced from the baking tray 6 placed on it, so that the insulation between the baking tray 6 and the guide rail 2 is maintained.

[0050] A profiling of the underside of the stop element 4, which is adapted to the shape of the guide rail 2, also serves to secure the stop element 4 to the guide rail 2. This profiling, in particular the areas that partially surround the guide rail 2 on the sides, is also to 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.

[0051] As can be seen in Figure 1 c, the baking tray 6 rests with an edge 61 on the support sections 33 and 43, respectively, and in particular on the longitudinal webs 331 and 431, respectively. 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 baking tray 6 placed thereon is completely electrically insulated from the metal of the pull-out guide.

[0052] 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, molded-on or bonded silicone material.

[0053] The baking tray 6 has openings 62 in the edge 61, wherein the guide pin 332 of the plug 3 engages in the front of the openings 62 and thus positions the baking tray 6 when placed on it and, in particular, fixes it laterally. In the rear area of ​​the baking tray 6, an outer edge 63 rests against the stop 42 of the stop element 4. Alternatively, however, the food carrier can also be positioned on the elements of the plug 3 and / or the stop element 4 on the guide rail 2 by means of a flanging of the edge of the food carrier, here the baking tray 6, or a wire running around a grid-shaped food carrier.

[0054] Figures 2a-c show another embodiment of a drawer guide according to the application. This drawer guide also has a plug 3 and a stop element 4. Figure 2a shows the drawer guide with the plug 3 and stop element 4 removed, as well as a baking tray 6 to be placed on top. Figure 2b shows the baking tray 6 placed on two drawer guides shown here. Figure 2c is a detailed view of the rear support area of ​​the baking tray 6 on the drawer guide.

[0055] The structure of the drawer guide in this second embodiment, with cabinet rail 1 and guide rail 2, is fundamentally comparable to that of the first embodiment. Unlike the first embodiment, there is no hole at the rear end of the guide rail 2 for attaching the stop element 4; instead, a metal stop bolt 23 is attached, in particular welded, to the guide rail 2.

[0056] The plug 3 fixed to the front end of the guide rail 2 corresponds to that of the first exemplary embodiment, to the description of which reference is hereby made. The stop element 4, which is inserted in the rear area of ​​the guide rail 2, differs from that of the first exemplary embodiment. It also has a support section 43 on which the baking tray 6 is positioned with its edge 61. A stop 42 is formed behind the support section 43, which here has the shape of a hollow cylindrical protuberance 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 means of a positive or frictional fit. In addition, a locking element encompassing the edge of the guide rail 2 can be formed as mounting means 41 at the rear end of the stop element 4.

[0057] The stop element 4 of the second embodiment, like the plug 3 and the stop element 4 of the first embodiment, can be made of an insulating material, for example PEEK. It is also conceivable that a softer material, for example silicone, is used in the area of ​​the support section 43. As in the first embodiment, the support of the baking tray 6 on the support section 33 or 43 of the plug 3 or stop element 4 creates electrical, or optionally additional thermal or noise-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 of the household appliance.

[0058] Figures 3a and 3b show a further development of the second embodiment. The basic structure of the drawer guide corresponds to that of the second embodiment shown in Figures 2a-c. Figure 3a shows the drawer guide with the plug 3 removed and the stop element 4 lifted off. Figure 3b shows the assembled drawer guide with a baking tray 6 partially shown in place.

[0059] In this third embodiment, the plug 3 again corresponds to one of the previously described embodiments. The stop element 4 is constructed similarly to that of the second embodiment. As before, the stop element 4 is provided with a hollow cylindrical protuberance, which 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 any impact of the baking tray 6 against the stop element 4 is dampened even more effectively.

[0060] Another embodiment of a drawer guide according to the application is shown in Figures 4a and 4b in a manner analogous to Figures 3a and 3b. The basic structure of the drawer guide corresponds to that of the second and third embodiments; thus, a stop bolt 23 is attached to the guide rail 2.

[0061] A damping cap 44 is directly placed onto this stop pin 23. This cap is constructed similarly to that of the third embodiment, except that it has a reduced inner diameter, allowing it to be fixed directly onto the stop pin 23 with a positive and frictional fit. This does not provide insulation along the edge 61 of the baking tray 6, but rather dampens the impact of the edge 63 of the baking tray 6 against the stop pin 23.

[0062] Unlike the previously shown embodiments, a plug 3 is arranged in the front area of ​​the guide rail 2, which provides a contact element 32 but no support 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 embodiments, provides insulation between the guide rail 2 and the front of the household appliance.

[0063] Figures 5a and 5b show a further development of the fourth embodiment. The basic structure of the pull-out guide is identical to that of the fourth embodiment shown in Figures 4a and 4b. As in the fourth embodiment, a damping cap 44 is placed on a stop pin 23 of the guide rail 2. This dampens the rear stop of a food support (not shown here) placed on the guide rail 2.

[0064] The plug 3 is modified compared to that of the fourth embodiment in that a damping element 321 is arranged on the side of the contact element 32 facing the guide rail 2, in its upper projecting section. Here, the damping element 321 essentially fills the projecting area of ​​the contact element 32 and is connected to it via a plug-in pin. For this purpose, the contact element 32 has a bore for receiving the plug-in pin. The damping element 321 also dampens the impact of the edge 63 of the baking tray 6 in the front area of ​​the guide rail 2. A soft plastic, in particular silicone, can be used as the material for the damping element 321. As an alternative fastening, the damping element 321 can also be fixed to the contact element 32 by a material fit. Figures 6a-c show a further embodiment of a pull-out guide according to the application.Figures 6a and 6b show the assembled pull-out guide in an isometric overall view, once without a baking tray (Figure 6a) and once with the baking tray 6 placed on top (Figure 6b).

[0065] The basic structure of the pull-out guide with cabinet rail 1 and guide rail 2 corresponds to the structure of the pull-out guides shown previously.

[0066] In the rear area of ​​the guide rail 2, a stop element 4 is used, which in this embodiment is already shown in the third embodiment in Figures 3a and 3b.

[0067] The embodiment shown in Figures 6a-c illustrates an alternative design of a plug 3 for use with a drawer slide. Figure 6c shows the plug 3 separately in two isometric views from different perspectives.

[0068] Unlike the plug 3 described in the previous embodiments, this plug 3 according to Figures 6a-c is not inserted into the front end of the guide rail 2, but rather is placed on the front end. This plug 3, like the previously described plugs, is made in one piece from an insulating material, e.g., PEEK or another suitable plastic. As in the previously described examples, the plug 3 provides electrical insulation between the guide rail 2 and a door, flap, or other front of the microwave cooking appliance, and between the guide rail 2 and the baking tray 6 placed on it.

[0069] The plug 3 has an approximately C-shaped base body 34 that at least partially encloses the guide rail 2. The base body 34 can be made of a material that is sufficiently elastic to allow it to be clipped around the guide rail 2 from the side.

[0070] A projection 341 is arranged on a lateral inner side of the base body 34, which engages in a corresponding recess or bore on the guide rail 2, thereby securing the plug 3 in the longitudinal direction. However, the positive fixation and the projection 341 provided for this purpose can also be dispensed with if the plug 3 and guide rail 2 are adapted to one another in such a way that the plug 3 is secured by friction.

[0071] On the outer upper side of the base body 34, a support section 33 for the edge of a baking tray placed thereon is formed. Similar to the plug 3 shown in Figures 1a-3b, longitudinal webs 331 and a guide pin 332 are formed, which positions and laterally fixes the baking tray placed thereon.

[0072] In an alternative embodiment of the exemplary embodiment shown in Figures 6a-c, the plug 3 can be formed by two separate parts, both of which have a base body 34 for fastening to the guide rail 2. The front part comprises the contact element 32, and the rear part comprises the support section 33.

[0073] Figures 7a-11c show further exemplary embodiments of plugs 3 that can be inserted into a front end of a guide rail 2 of a drawer guide and that 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. The drawer guide can, for example, be designed analogously to the drawer guides shown in the previously described exemplary embodiments.

[0074] Figures 7a, b and 8a, b show two further examples of one-piece plugs 3. Figures 7a and 8a show the plug 3 before insertion into the guide rail 2, and Figures 7b and 8b show the plug 3 inserted into the guide rail 2.

[0075] In the embodiment of Figures 7a, b, the plug 3 is designed similarly to the plug shown in Figures 4a, b. Unlike the embodiment shown there, a purely clamping fastening of the plug 3 in the front end of the guide rail 2 is provided here. For this purpose, the insertion body 31 of the plug 3 has elevations 311, here in the form of a ribbing, along the four longitudinal edges of the insertion body 31. In the embodiment of Figures 8a, b, instead of the ribbing, an elevation 311 in the form of a curved projection is arranged on one or both sides of the insertion body 31.

[0076] The plug 3 shown in the embodiment of Figures 9a-c is constructed in two parts, unlike the previously described ones, and has an insert body 31 that is connected to a contact element 32. Unlike the previously shown embodiments, the insert body 31 and the contact element 32 are therefore not integrally formed with one another.

[0077] Figure 9a shows, in the manner of an exploded view, the insert body 31 before being inserted into the front end of the guide rail 2, and the contact element 32 before being connected to the insert body 31. Figure 9b shows the contact element 32 plugged onto the insert body, with the plug 3 thus formed not yet inserted into the guide rail 2. Finally, Figure 9c shows the plug 3 inserted into the front end of the guide rail 2.

[0078] To connect the contact element 32 to the insert body 31, the contact element 32 has a rectangular opening 322 in this embodiment, into which a pin 312 of the insert body 31 is inserted during assembly. This can be done, for example, in such a way that the contact element 32 and the insert body 31 are clamped together.

[0079] An advantage of the two-part design of the plug 3 lies in the possibility of using different materials for the insert body 31 and the contact element 32. For example, the contact element 32 can be made of a ceramic material, thereby achieving good insulation and shielding with a view to preventing flashover. The insert body 31 can be made of a plastic material that is elastic in contrast to ceramic. The elasticity of the plastic allows a good frictional connection to be achieved between the insert body 31 and the contact element 32. In addition, the insert body 31 with the pin 312 protrudes forward beyond the contact element 32, thereby achieving mechanical stop 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 contact element 32, it can also be provided that the pin is thermally deformed after being pushed through the opening 322 of the contact element 32, so that a positive connection is created.

[0080] In order to secure the plug 3 in the guide rail 2, in the illustrated embodiment a groove 313 is formed on an upper side of the insert body 31. The guide rail 2 has a punched-out web 24 at its front end, which is slightly angled downwards. When the plug 3 is pushed into the front end of the guide rail 2, the web 24 engages in the groove 313 in a locking manner and thus secures the plug 3. The web 24 can be pre-bent so that the plug 3 can be inserted in a locking manner. It is also conceivable for the web 24 to be punched out 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, whereupon the web 24 is bent downwards with the plug 3 already inserted in order to secure the plug 3.

[0081] Figures 10a-c show a further embodiment of a two-part plug 3 in the same way as in Figures 9a-c. In contrast to the embodiment in Figures 9a-c, the insert body 31 has laterally arranged grooves 314. The contact element 32 in turn has an opening 322, which in this case is open at the bottom. As can be seen in Figure 10b, to assemble the plug, the contact element 32 is inserted with the edges of the opening 322 into the lateral grooves 314 of the insert body 31. The plug 3 thus created is then pushed into the front end of the guide rail 2, whereby in the example shown here a purely clamping, frictional connection is provided between the plug 3 and the guide rail 2.

[0082] Figures 11a-c show a modified embodiment similar to that shown in Figures 10a-c. The basic structure corresponds to that of the embodiment shown in Figures 10a-c. In contrast, in the insert body 31, the section of the insert body 31 that protrudes forward beyond the contact element 32 is larger in cross-section than the rear section inserted into the guide rail 2.

[0083] Figures 12a to 17c show three further embodiments of drawer guides, which represent further developments of the fourth embodiment shown in Figures 4a and b. For all three embodiments, the basic structure of the drawer guide with cabinet rail 1 and guide rail 2 corresponds to the structure of the previously shown drawer guides, to which explicit reference is hereby made.

[0084] Only a front section of each drawer guide, into which a plug 3 is inserted, is shown. The opposite end region can, for example, be designed as previously described with a rear stop for a cooking support (also not shown).

[0085] What is common to all three embodiments of Figures 12a to 17c is that a contact element 35 is arranged in or on the plug 3, which electrically connects end sections 25 of the legs of the U-shaped running rail 2 when the plug 3 is inserted into the running rail 2.

[0086] This is based on the knowledge that microwaves can penetrate through the plug 3 from the front into the essentially U-shaped guide rail if the latter is made of an insulating material. Within the guide rail 2, the microwaves are then passed on by reflection until they hit an obstacle, usually a rolling element cage of the pull-out guide. There they release their energy, which leads to unnecessary and undesirable heating of the rolling element cage and a reduction in the efficiency of the microwave cooking appliance. It has been shown that electrical contact between the end sections 25 of the guide rail 2 effectively prevents the microwaves from penetrating the volume enclosed by the guide rail 2. Contact that is positioned as close as possible to the edge, both in the pull-out direction and in the direction of the free ends of the legs of the U-shaped guide rail 2, has proven particularly effective.

[0087] Figures 12a-c and 13a, b show a first embodiment of such a pull-out rail with plug 3 with contact element 35.

[0088] Figures 12a and b each show 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 formed laterally and from below in the insertion body 31 of the plug 3, into which the contact element 35, shown separately in Figure 12a, is inserted. In this exemplary embodiment, the contact element 35 is a U-shaped wire section. Figures 12b and 13a show the contact element 35 inserted into the insertion body 31 from two different viewing directions. Finally, in Figures 12c and 13b, the insertion body 31 is inserted into the running rail 2. It can be seen that the contact element 35 connects the free end sections 25 of the legs of the U-shaped running rail 2. In the end region, the profile of the running rail 2 is thus electrically closed, forming effective shielding against microwaves.It turns out that the shielding effect against the penetration of microwaves is just as effective, or at least almost as effective, as when the front end of the guide rail 2 is completely closed with an electrically conductive material.

[0089] Figures 14a, b and 15ac show a second embodiment of a drawer guide with plug 3 and contact element 35. The representation in Figures 14a, b corresponds to that in Figures 12b, c. In Figures 15a, b, the plug 3 is shown separately in a spatial representation before the contact element 35 is mounted and with the contact element 35 mounted. Figure 15c shows a sectional view through the guide rail 2 with the plug 3 inserted.

[0090] In contrast to the previously described embodiment of Figures 12a to 13b, the contact element 35 is also a U-shaped bent sheet metal, not a wire section. Accordingly, the recesses 315 in the insert body 31 are wider. Basically, the effect is similar to that in the previously described embodiment, whereby the greater width of the sheet metal compared to the wire section leads to more secure contact between the contact element 35 of 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 deviate from a symmetrical U-shape, as shown in Fig. 15c, in order to connect the end sections 25 of the legs via the shortest route.

[0091] Finally, Figures 16a to 17c show a third embodiment of a pull-out guide with plug 3 and contact element 35 in a manner comparable to Figures 14a to 15c.

[0092] Here, comparable to the previous embodiment, a U-shaped sheet metal element is used as the contact element 35. 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 insert body 31 are also aligned accordingly.

[0093] The advantage here is that even greater clamping forces (which lead to better contact between the contact element 35 and the guide rail 2) can be applied without the risk of the contact element 35 being pushed out of the recesses 315 when inserted into the guide rail 2. To achieve particularly good electrical contact, in this exemplary embodiment the contact element 35 is additionally provided with an outwardly directed bend 351 at each of its two free ends. The bends 351 represent the main contact points with the guide rail 2, which are preferably located in the front area of ​​the end section 25. A stop tab 316 integrated in the rear area 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 with other guide elements, such as the body rail 1 or the center rail, from the contact element 35.

[0094] List of reference symbols

[0095] 1 cabinet rail

[0096] 11 Mounting clamp

[0097] 2 guide rails

[0098] 21 recess

[0099] 211 jetty

[0100] 22 Hole

[0101] 23 stop bolts

[0102] 24 jetty

[0103] 25 final section

[0104] 3 plugs

[0105] 31 insert bodies

[0106] 311 Survey

[0107] 312 cones

[0108] 313 groove

[0109] 314 side groove

[0110] 315 Deepening

[0111] 316 stop tab

[0112] 32 Investment element

[0113] 321 Damping element

[0114] 322 Opening

[0115] 33 support section

[0116] 331 Longitudinal web

[0117] 332 guide pins

[0118] 34 basic bodies

[0119] 341 lead

[0120] 35 Contact element

[0121] 351 Angulation

[0122] 4 stop element

[0123] 41 assembly materials

[0124] 42 stop

[0125] 43 support section

[0126] 431 Longitudinal web

[0127] 44 Damping cap

[0128] 6 baking trays

[0129] 61 rand

[0130] 62 Breakthrough

[0131] 63 edge

Claims

Claims 1. Drawer guide for a household appliance with microwave cooking function, comprising a cabinet rail (1) and at least one metallic running rail (2) movable relative to it for placing a cooking carrier, wherein a plug (3) is arranged in a front area of ​​the running rail (2) as seen in the direction of extension, which has a support element (32) projecting forward and upward over the running rail (2) for the cooking carrier, characterized in that the plug (3) is made at least partially of an electrically insulating material.

2. Extraction guide according to claim 1, wherein at least the mounting element (32) is made of the insulating material.

3. Extraction guide according to claim 1 or 2, wherein the insulating material is also thermally insulating and / or shock-absorbing.

4. Extraction guide according to one of claims 1 to 3, wherein the insulating material is a ceramic or a plastic, in particular a high-temperature resistant thermoplastic, an elastomer and / or a thermoset.

5. Extension guide according to one of claims 1 to 4, wherein the plug (3) has an insertion body (31) which is inserted into a front end of the running rail (2).

6. Extension guide according to claim 5, in which the insertion body (31) is clamped and / or snapped onto the running rail (2).

7. Extension guide according to claim 5 or 6, wherein a section of the guide rail (2) in the front area is reshaped, in particular recessed, in order to secure the insertion body (31) by positive or force locking.

8. Extension guide according to claim 7, wherein the guide rail (2) has a die-cut web (24, 211) which is formed.

9. Extension guide according to one of claims 1 to 4, wherein the plug (3) has a c-shaped base body (34) which is mounted on the guide rail (2). A drawer guide according to claim 9, wherein the base body (34) is clamped and / or snapped onto the guide rail (2). A drawer guide according to claim 9 or 10, wherein the base body (34) has a projection (341) that engages in a bore or recess in the guide rail (2). A drawer guide according to any one of claims 1 to 11, wherein the plug (3) has a support section (33) for the food carrier that is aligned parallel to the extension direction and projects upwards beyond the guide rail (2). A drawer guide according to claim 12, wherein the support section (33) of the plug (3) has longitudinal ribs (331) on which the food carrier can rest. A drawer guide according to claim 12 or 13, wherein an upwardly projecting guide pin (332) for the food carrier is arranged in the area of ​​the support section (33) of the plug (3). Extraction guide according to one of claims 1 to 14, wherein the plug (3) is formed in one piece.A drawer slide according to any one of claims 1 to 14, wherein the plug (3) is at least two-part, the contact element (32) not being integrally formed with the insertion body (31) or the base body (34). A drawer slide according to claim 16, wherein the contact element (32) is made of a different material than the insertion body (31) or the base body (34). A drawer slide according to claim 17, wherein the insertion body (31) or the base body (34) is made of the electrically insulating material, in particular ceramic or PEEK. A drawer slide according to any one of claims 1 to 18, wherein the guide rail (2) has a substantially U-shaped profile with two legs and wherein a contact element (35) is arranged on or in the plug (3), which electrically contacts two end sections (25) of the legs of the guide rail (2). A drawer slide according to any one of claims 1 to 19, comprising a stop element (4) mounted on the guide rail (2) in a rear region as viewed in the extension direction and having a stop (42) projecting upwards beyond the guide rail (2) for the food carrier. A drawer slide according to claim 20, wherein the stop element (4) has a further support section (43) for the food carrier, aligned parallel to the extension direction and projecting upwards beyond the guide rail (2). A household appliance with a microwave cooking function, comprising at least one drawer slide according to any one of claims 1 to 21 for receiving a food carrier.