EP2988068A1 - Telescopic drawer system and household cooking appliance - Google Patents

Abstract

The invention relates to a telescopic extension system (13) for a household appliance (1), having a first running rail (14), a second running rail (15) and a bearing device (16) arranged between the first running rail (14) and the second running rail (15). comprising a roller bearing cage (17) and a plurality of roller bearing bodies (18) accommodated in the roller bearing cage (17), the first running track (14) and the second running track (15) between a retracted state and an extended state of the telescopic extension system (13). relative to each other are displaceable, wherein on the first track (14) and on the second track (15) each have a stop element (19, 20) for the roller bearing cage (17) is provided, wherein one of the stop elements (19, 20) during displacement of the first running rail (14) and the second running rail (15) from the extended state in the retracted state of the telescopic extension system (13) on the rolling bearing cage (17) anleg bar is to move the storage device (16) when moving the telescopic extension system (13) from the extended state to the retracted state in a defined starting position in which the bearing means (16) between the stop members (19, 20) is arranged.

Description

The present invention relates to a telescopic extension system for a Haushaltsgargerät and a Haushaltsgargerät.

For Haushaltsgargeräte, such as ovens, there are so-called telescopic extension systems, which allow the user to pull out accessories such as baking sheets significantly further out of the oven than would be possible with normal Einhängegittern.

The DE 10 2008 035 078 A1 describes such a telescopic extension system for a Haushaltsgargerät with an inner track, a middle track and an outer track. At the middle track rail, a latching device is provided which is adapted to lock the inner track rail and the outer track rail with the middle track rail.

The DE 10 2011 052 824 A1 describes a telescopic extension system with a fixed and a movable running rail, which are mounted relative to one another via rolling bearing, which are received by a rolling bearing cage, relative to each other. The rails have at least one stop to limit the displacement of the movable track rail. The stop projects into a displacement path of the roller bearing cage to near a rotational axis or to at least half of the radius of the rolling elements.

Against this background, an object of the present invention is to provide an improved telescopic extension system.

Accordingly, a telescopic extension system for a Haushaltsgargerät with a first track, a second track and arranged between the first track and the second track rail bearing means comprising a roller bearing cage and a plurality of housed in the rolling bearing cage rolling bearing body proposed. The first running rail and the second running rail are displaceable relative to each other between a retracted state and an extended state of the telescopic extension system, wherein on the first running rail and on the second running rail each one stop element is provided for the roller bearing cage, wherein one of the stop elements during displacement of the first track and the second track from the extended state in the retracted state of the telescopic extension system can be applied to the roller bearing cage to the bearing device when moving the telescopic extension system from the extended state in to shift the retracted state to a defined starting position, in which the bearing device is arranged between the stop elements.

In such a telescopic extension system, an offset of the rolling bearing cage is permitted when moving the telescopic extension system from the retracted state to the extended state. When moving the telescopic extension system from the extended state to the retracted state, however, is brought by the stop members, which are provided on the rails, the rolling bearing cage each time back to its original position. This prevents that the offset of the rolling bearing cage added at each extraction process. It is therefore only a slight cage offset to calibrate each time you insert the telescopic extension system. This ensures that the telescopic extension system over its entire life, despite lower lubrication due to pyrolysis or cleaning in a household appliance, such as a dishwasher, his Auszugsweg fully exploited. As a result, a reliably usable rest stop can be ensured. The rails can also be referred to as guide rails. The retracted state can also be referred to as an inserted state, the extended state can also be referred to as an extended state.

According to one embodiment, the first running rail can be fastened to or in a cooking chamber of the household cooking appliance.

In particular, the first running rail can be fastened to a side wall of the cooking chamber. Preferably, a telescopic extension system is provided in each case on two opposite side walls of the cooking chamber.

According to a further embodiment, the rolling bearings are spherical.

Alternatively, the rolling bearing body may be formed, for example, barrel or cone-shaped.

According to a further embodiment, the telescopic extension system has a locking device, which is adapted to lock the first track rail and the second track rail in the extended state of the telescopic extension system with each other.

This can be prevented when placing a baking sheet on the telescopic extension system that the rails move uncontrollably. This increases the ease of use.

According to a further embodiment, the stop elements are formed as separate components.

The stop elements may be formed, for example, as pins, bolts, screws, rivets or the like.

According to a further embodiment, the stop elements are integrally formed with the respective track rail material.

For example, the stop elements may be formed as embossments, exhibitions, protrusions or bends of the respective track.

According to a further embodiment, a distance between the stop elements in the retracted state of the telescopic extension system corresponds to a length of the roller bearing cage.

This is also to be understood that the distance between the stop elements is slightly larger than the length of the rolling bearing cage, so that the stop of the roller bearing cage on the stop elements of the rolling bearing cage remains free of force. As a result, the rolling bearing cage is not loaded during insertion. The distance between the stop elements can correspond at most to the length of the roller bearing cage. Preferably, the distance between the stop members is slightly larger than the length of the rolling bearing cage. As a result, the roller bearing cage can be arranged exactly between the stop elements.

According to a further embodiment, the telescopic extension system on the first track and the second track rail provided further stop elements on which in each case a rolling bearing body is applied in the extended state of the telescopic extension system.

The further stop elements preferably protrude into the middle of the rolling elements in an intermediate space provided between the rails. The further stop elements prevent the bearing device from falling out between the rails.

According to a further embodiment, the telescopic extension system is capable of pyrolysis.

This means that the telescopic extension system can also be used at temperatures over 450 °. The telescopic extension system may moreover be suitable for being cleaned in a dishwasher.

According to a further embodiment, in the defined starting position of the bearing device, the roller bearing cage bears against at least one of the stop elements.

Preferably, the rolling bearing cage abuts only one of the stop elements. Alternatively, the rolling bearing cage can abut against both stop elements.

Furthermore, a Haushaltsgargerät proposed with such a telescopic extension system.

The household appliance is in particular an oven, a microwave oven, a steamer or a microwave oven. The Haushaltsgargerät preferably has a plurality of such telescopic extension systems.

Further possible implementations of the telescopic extension system and / or the household cooking appliance also include combinations of previously or not explicitly mentioned combinations The following described with respect to the embodiments features or embodiments. The skilled person will also add individual aspects as improvements or additions to the respective basic form of the telescopic extension system and / or the Haushaltsgargeräts.

• Fig. 1 zeigt eine schematische perspektivische Ansicht einer Ausführungsform eines Haushaltsgeräts;
• Fig. 2 zeigt eine schematische Seitenansicht einer Ausführungsform eines Teleskopauszugssystems für das Haushaltsgerät gemäß der Fig. 1;
• Fig. 3 zeigt eine schematische Schnittansicht des Teleskopauszugssystems gemäß der Fig. 2;
• Fig. 4 zeigt eine weitere schematische Schnittansicht des Teleskopauszugssystems gemäß der Fig. 2;
• Fig. 5 zeigt eine weitere schematische Schnittansicht des Teleskopauszugssystems gemäß der Fig. 2; und
• Fig. 6 zeigt eine weitere schematische Schnittansicht des Teleskopauszugssystems gemäß der Fig. 2.

Further advantageous embodiments and aspects of the telescopic extension system and / or the Haushaltsgargeräts are the subject of the dependent claims and the embodiments described below of the telescopic extension system and / or Haushaltsgargeräts. Furthermore, the telescopic extension system and / or the Haushaltsgargerät are explained in more detail by means of preferred embodiments with reference to the accompanying figures.

• Fig. 1 shows a schematic perspective view of an embodiment of a household appliance;
• Fig. 2 shows a schematic side view of an embodiment of a telescopic extension system for the household appliance according to the Fig. 1 ;
• Fig. 3 shows a schematic sectional view of the telescopic extension system according to the Fig. 2 ;
• Fig. 4 shows a further schematic sectional view of the telescopic extension system according to the Fig. 2 ;
• Fig. 5 shows a further schematic sectional view of the telescopic extension system according to the Fig. 2 ; and
• Fig. 6 shows a further schematic sectional view of the telescopic extension system according to the Fig. 2 ,

In the figures, the same or functionally identical elements have been given the same reference numerals, unless stated otherwise.

The Fig. 1 shows a schematic perspective view of a Haushaltsgargeräts 1. The Haushaltsgargerät 1 is for example an oven, a microwave oven, a microwave oven or the like. The Haushaltsgargerät 1 has a muffle or a cooking chamber 2, which is closed by a door 3. The cooking chamber 2 may be arranged inside a housing of the Haushaltsgargeräts 1. The door 3 is in the Fig. 1 shown in their closed position. By pivoting about a provided at a lower end of the door 3 pivot axis, the door 3 can be closed or opened. Alternatively, the door 3 can be struck laterally on the cooking chamber 2. Furthermore, the door 3 can be arranged on a withdrawable from the cooking chamber 2 baking carriage. At an upper portion of the door 3, a handle 4 may be provided.

The cooking chamber 2 has a bottom 5, a cover 5 arranged opposite the bottom 5, a rear wall 7 arranged opposite the door 3 and two side walls 8, 9 arranged opposite one another. The cooking chamber 2 is preferably cuboid or cube-shaped. The cooking chamber 2 may be made of a metal material, in particular of a steel sheet.

The Fig. 2 shows an accessory carrier 10 for the cooking chamber 2 of the Haushaltsgargeräts 1. The accessory carrier 10 may be a so-called Einhängegestell or side rails of Haushaltsgargeräts 1. In particular, such an accessory carrier 10 is arranged on each side wall 8, 9 of the cooking chamber 2. The accessory carrier 10 can be removed from the cooking chamber 2. The accessory carrier 10 has horizontally extending struts 11 and vertically extending struts 12. In the Fig. 2 is in each case only one of the struts 11, 12 provided with a reference numeral.

On the accessory carrier 10, a telescopic extension system 13 is provided. On the accessory carrier 10 more telescopic extension systems 13 may be provided. The telescopic extension system 13 can be detachably fastened to the accessory carrier 10. Alternatively, the telescopic extension system 13 may be attached directly to one of the side walls 8, 9. Preferably, at least one such telescopic extension system 13 is provided on each side wall 8, 9.

The telescopic extension system 13 has a first or inner running rail 14 and a second or outer running rail 15. The rails 14, 15 may also be referred to as guide rails. The first running rail 14 is fastened by means of the accessory carrier 10 or directly to one of the side walls 8, 9.

The 3 and 4 show the telescopic extension system 13 each in a schematic sectional view. The Fig. 3 shows the telescopic extension system 13 in a retracted state. The Fig. 4 shows the telescopic extension system 13 in an extended state. The following is on the 3 and 4 simultaneously referred to. The retracted state may also be referred to as an inserted state and the extended state may also be referred to as an extended state.

Between the first running rail 14 and the second running rail 15, a bearing device 16 is arranged, which has a roller bearing cage 17 and a plurality of received in the rolling bearing cage 17 rolling bearing body 18. The number of rolling bearing body 18 is arbitrary. For example, the storage device 16, as in the 3 and 4 shown, four rolling bearing body 18 have. The rolling bearing body 18 are for example balls. The rolling bearing body 18 are rotatably received in the rolling bearing cage 17.

When displacing the first running rail 14 and the second running rail 15 between the retracted state and the extended state of the telescopic extension system 13, the rails 14, 15 are supported by means of the bearing device 16 together. At the first track 14, a first stop member 19 is provided. At the second running rail 15, a second stop member 20 is provided. The stop elements 19, 20 protrude so far into a gap 21 between the rails 14, 15 that the stop elements 19, 20 can touch the roller bearing cage 17 and not the roller bearing body 18. The stop elements 19, 20 are spaced from each other at a distance a. The rolling bearing cage 17 has a length l. The length l is at most as large as the distance a. Preferably, the length l is slightly smaller than the distance a. The bearing device 16 is positioned between the stop elements 19, 20. In the retracted state of the telescopic extension system 13, the roller bearing cage 17 of one of the stop elements 19, 20 touch.

In the extended state of the telescopic extension system 13, the rails 14, 15 are locked together. As the Fig. 2 shows, the telescopic extension system 13 for this purpose, a locking device 22 which is adapted to lock the first track 14 and the second track rail 15 in the extended state of the telescopic extension system 13 with each other.

The FIGS. 5 and 6 show the telescopic extension system 13 in each case in its extended state. Due to the normal movement of the telescopic extension system 13, the roller bearing bodies 18 roll on the respective rails 14, 15. However, since the rolling bearing body 18 must be designed with a certain play to the rails 14, 15 so as not to jam, it comes isolated in addition to the pure rolling motion also to slip or Gleitanteilen. Depending on the inclination of the telescopic extension system 13 and slightly different diameters of the rolling bearing body 18, this influence can be significantly increased. The result is that the rolling bearing body 18 have already arrived at a running rail 14, 15 at the end and on the other rail 15, 14 have not yet covered the full path. The consequence is a reduced excerpt. This so-called cage offset can add up over time, so that noticeable losses of the excursion path are recorded.

By the stop elements 19, 20 of the offset of the rolling bearing cage 17 can be avoided or at least limited. When moving the telescopic extension system 13 of its retracted in the extended state, an offset of the rolling bearing cage 17 is allowed. When moving the telescopic extension system 13 from the extended to the retracted state of the roller bearing cage 17 is brought by the stop members 19, 20 each time back to a defined starting position.

As the Fig. 5 shows, in the insertion movement indicated by an arrow, the bearing device 16 is positioned so that the rolling bearing cage 17 abuts when displacing the telescopic extension system 13 of the extended in the retracted state of the first stop element 19. By inserting the second guide rail 15, the storage device 16 in the in the Fig. 3 displaced shown defined starting position, in which the bearing means 16 between the stop members 19, 20 is arranged. The defined starting position is the position of the roller bearing cage 17, which theoretically exist in the retracted state of the telescopic extension system 13 must, so that the path of the bearing means 16 on the first or fixed track 14 and the second or movable track rail 15 is identical.

As the Fig. 6 shows, the bearing means 16 may also be positioned so that when displacing the telescopic extension system 13 from the extended state in the retracted state of the roller bearing cage 17 rests against the second stop member 20 to this again in the in the Fig. 3 to shift shown defined starting position.

The stop elements 19, 20 and the rails 14, 15 may be designed as separate components. For example, the stop members 19, 20 may be formed as screws, pins, bolts, rivets or the like. Alternatively, the stop elements 19, 20 may be integrally formed with the respective track rail 14, 15. For example, the stop elements 19, 20 as bulges, embossments, exhibitions or the like of the rails 14, 15 may be formed.

In the retracted state of the telescopic extension system 13, the roller bearing cage 18 can rest against at least one of the stop elements 19, 20. The rolling bearing cage 17 can also rest on both stop elements 19, 20 simultaneously. However, the roller bearing cage 17 is preferably located only on one of the stop elements 19, 20. As a result, a mechanical load of the roller bearing cage 17 is prevented.

At the first track 14 and the second track 15 are, as in the Fig. 3 to 6 shown, further further stop elements 23, 24 are provided, which in each case a rolling bearing body 18 abuts in the extended state of the telescopic extension system 13. As a result, falling out of the bearing device 16 between the rails 14, 15 is prevented.

The telescopic extension system 13 is preferably capable of pyrolysis. That is, the telescopic extension system 13 can also be used at temperatures above 450 °. Since the offset of the roller bearing cage 17 is no longer added at each extraction process, only a small offset when moving the telescopic extension system 13 is to be calibrated from the extended state to the retracted state. In this way, a telescopic extension system 13 can be provided, which also over its lifetime despite lower lubrication, for example due to the cleaning of Teleskopauszugssystems 13 using pyrolysis or a dishwasher, the Auszugsweg fully exploited. This calibration measure of the roller bearing cage 17 is also essential for a reliably usable locking stop by means of the locking device 22.

Although the present invention has been described with reference to exemplary embodiments, it can be modified in many ways.

Used reference signs:

1

Haushaltsgargerät

2

oven

3

door

4

Handle

5

ground

6

blanket

7

rear wall

8th

Side wall

9

Side wall

10

Accessories support

11

strut

12

strut

13

Telescopic extension system

14

runner

15

runner

16

Storage facility

17

Rolling bearing cage

18

Rolling body

19

stop element

20

stop element

21

gap

22

locking device

23

stop element

24

stop element

a

distance

l

length

Claims (11)

A telescopic extension system (13) for a household cooking appliance (1), comprising a first running rail (14), a second running rail (15) and a bearing device (16) arranged between the first running rail (14) and the second running rail (15) and comprising a roller bearing cage (17) and a plurality in the rolling bearing cage (17) received rolling bearing body (18), wherein the first running rail (14) and the second running rail (15) between a retracted state and an extended state of the telescopic extension system (13) are displaceable relative to each other in which a stop element (19, 20) for the roller bearing cage (17) is provided on the first track rail (14) and on the second track rail (15), one of the stop elements (19, 20) being displaced during displacement of the first track rail (14 ) and the second running rail (15) from the extended state in the retracted state of the telescopic extension system (13) on the roller bearing cage (17) can be applied to the Lagereinric when moving the telescopic extension system (13) from the extended state to the retracted state into a defined starting position in which the bearing device (16) is arranged between the stop elements (19, 20). Telescopic extension system according to claim 1, characterized in that the first running rail (14) on or in a cooking chamber (2) of the Haushaltsgargeräts (1) can be fastened. Telescopic extension system according to claim 1 or 2, characterized in that the rolling bearing body (18) are spherical. Telescopic extension system according to one of claims 1 - 3, characterized by a locking device (22), which is adapted to lock the first track rail (14) and the second track rail (15) in the extended state of the telescopic extension system (13) with each other. Telescopic extension system according to one of claims 1 - 4, characterized in that the stop elements (19, 20) are designed as separate components. Telescopic extension system according to one of claims 1 - 4, characterized in that the stop elements (19, 20) integral with the respective running rail (14, 15) are formed. Telescopic extension system according to one of claims 1 - 6, characterized in that a distance (a) between the stop elements (19, 20) in the retracted state of the telescopic extension system (13) corresponds to a length (l) of the roller bearing cage (17). Telescopic extension system according to one of claims 1 to 7, characterized by further stop elements (23, 24) provided on the first running rail (14) and the second running rail (15), on each of which a rolling bearing body (18) in the extended state of the telescopic extension system (13). is applied. Telescopic extension system according to one of claims 1 - 8, characterized in that the telescopic extension system (13) is capable of pyrolysis. Telescopic extension system according to one of claims 1 - 9, characterized in that in the defined starting position of the bearing device (16) of the rolling bearing cage (17) on at least one of the stop elements (19, 20). Haushaltsgargerät (1) with a telescopic extension system (13) according to any one of claims 1-10.

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