DE102017203137A1 - Rail extension device with at least running noise reducing additional part of a ball cage and household appliance with a rail extension device - Google Patents

Abstract

The invention relates to a rail extension device (7) for a household appliance (1), comprising a first rail (8) and a separate second rail (9) which is connected to the first rail (8), wherein the rails (8, 9 ) in the direction of their longitudinal axes (L) relative to each other by means of a to the rails (8, 9) separate Wälzköpervorrichtung (10) of the rail extension device (7) are displaceable, wherein a rolling body (13, 14) of the Wälzkörpervorrichtung (10) for performing a rolling movement with a running area (16, 19) with a running surface (15, 16, 17, 18) of at least one rail (8, 9) is coupled, and on a Wälzkörperkäfig (12) is arranged, wherein on the Wälzkörperkäfig (12) a to Rolling body (13, 14) and to the rails (8, 9) separate, sheet-like contact element (24) is arranged, with which the rolling elements (13, 14) is in direct contact and by which at least one damping of a movement noise of the rolling body (13 , 1 4) is formed. The invention also relates to a household appliance (1).

Description

The invention relates to a rail extension device for a household appliance, which has a first rail and a separate second rail, which is connected to the first rail, wherein the rail in the direction of their longitudinal axes relative to each other by means of a Wälzkörpervorrichtung be displaced in a direction of displacement. Moreover, the invention also relates to a household appliance with at least one such rail extension device.

Rail extension devices in the form of so-called telescopic extensions are well known. In such embodiments, the two elongated rails, which usually have substantially equal lengths, are correspondingly extendable and collapsible. On such rail extension devices are in household appliances for preparing food, such as a cooking appliance, food support, such as a baking tray, or a drip tray or a grate applicable, so that they can be easily pulled out of a cooking chamber of the cooking appliance and pushed back into it. It is also known in the context that these two rails are mounted on rolling elements, such as balls, slidably to each other. The case provided ball cage, for example, takes only the position control of the balls on corresponding recesses and is otherwise considered force and effect free with respect to the rolling elements. The weight of the food carrier is transferred directly from these balls over a rail to another. In addition to the almost pure rolling motion of the rolling elements on the tracks of the rails, however, the balls grind directly on the ball cage during rolling. This can lead to tilting of the cage and consequently also to a bucking and a hook of the pull-out rail. However, if the system is lubricated with a lubricant, especially a grease, these unwanted friction effects are significantly reduced. However, in these embodiments, a significant disadvantage is the fact that these lubricants are not suitable for high temperatures, as may occur, for example, in a pyrolysis operation of a cooking appliance mentioned. In rail extension devices for household appliances for preparing food, which also have a pyrolysis, so only a dry lubrication makes sense. In addition, in embodiments with a lubricant mentioned above, a sufficient amount of this lubricant is required in order to actually be able to significantly reduce these frictional effects. This in turn has disadvantages for the rail extension device to the effect that it is then not suitable for dishwasher, because in a washing process in the dishwasher, this lubricant is then washed out.

This results in running restrictions of the rails to each other.

From the DE 199 49 239 A1 is a pull-out device for a food support in the cooking of Garöfen known in which the Wälzkörpervorrichtung has rollers as rolling elements.

From the DE 10 2012 218 007 A1 is a household appliance known which has an extract with two rails. Balls are held in a ball cage. A fixed rail has on an upper side an integrated structure having a plurality of recesses. This structure, when moved relative to a graphite rod, shears graphite material therefrom and serves as a lubricant for the balls then passing over the structure. There may be running noise here.

From the DE 20 2011 051 895 U1 is a ball cage for a rail extension device known. At this C-shaped profile are balls. Separate roller-shaped and thus very chunky lubricant elements are arranged separately. With this configuration, running noise is associated with a rail extension device.

It is an object of the present invention to provide a rail extension device and a household appliance, in which running noise of the rail extension device are reduced in the movement of the rails to each other.

This object is achieved by a rail extension device and a household appliance according to the independent claims.

One aspect of the invention relates to a rail extension device for a household appliance, which has a first rail and a separate second rail. In particular, the rails each have an elongated bar-like shape and the length of one of the two rails corresponds to at least a length of between 80 percent and 100 percent of the length of the other rail. In particular, the two rails are formed substantially the same length. The two rails are connected to one another, the rails being displaceable in the direction of their longitudinal axes and thus also in the direction of a longitudinal axis of the rail extension device relative to each other by means of a rolling body device, wherein the rolling body device is a separate unit relative to the two rails. The Wälzkörpervorrichtung has to a separate Wälzkörperkäfig on which the separate rolling elements are arranged to be movable. On the Wälzkörperkäfig is a rolling element and arranged to the rails separate, film-like contact element, with which the rolling elements is in direct contact and through which at least one damping of a movement noise of the rolling body is formed. As a result of this refinement, at least improved smoothness of the rail extension device is achieved in a simple and space-saving manner. This contact element can be adapted by its shape and type to complex shapes and thus safe and full surface are installed there, while it also permanently maintains the functionality. The film-like design, which can also be referred to paper-like with respect to the shape or thinness and the mechanical stability properties, substantially favors these advantages.

The film-like contact element is in particular elastically deformable, whereby the advantages mentioned are achieved to a particular extent. Both the cutting and the processing are then very precisely possible and adaptable to the conditions of the building. In particular, the contact element is elastically deformable in its thickness and thus reversibly compressible.

The foil-like contact element has, in an advantageous embodiment, a lubricant. The lubricant may be incorporated in the material of the contact element. As a result, the functionality of this contact element is increased.

The film-like contact element is in particular arranged non-destructively detachable. As a result, an exchange of the contact element alone can be completed.

The film-like contact element can also be arranged in a stationary or motion-coupled manner on the roller body cage, so that no relative movement occurs between the roller body cage and the contact element. As a result, a motion-eliminated fixation is achieved, which allows the smooth and smooth movement of the rolling elements on the contact element and at least the noise reduction allows particularly advantageous.

Preferably, the rolling element cage has a recess in which a rolling element is arranged to be relatively movable, the recess being delimited by at least one web projecting from the plane of the recess, and at least one side of the web facing the rolling element and contactable with the rolling element Contact element has. As a result, a locally very needs-based attachment of the contact element is reached, which is only there by the thin film form attachable and particularly advantageous contacting with the rolling element allows, on the other hand does not restrict its movement, so that the recess does not need to be increased.

The film-like contact element is at least partially arranged at least on an inner side of the roller body cage. This also allows a space-saving and functionally advantageous design.

The foil-like contact element is, in an advantageous embodiment, a graphite foil. The additional function of the lubrication is achieved here particularly simple and advantageous, since graphite has lubricating properties.

The film-like, planar contact element has, in particular, a thickness of between 0.1 mm and 1 mm, in particular between 0.2 mm and 0.5 mm. Such a thin design favors the above advantages.

Preferably, the film-like contact element is at least partially formed as a self-adhesive film. This makes it particularly easy to install, since no additional adhesive or other fastening means are needed. The assembly effort is thereby also reduced, since at least the manufacturing step of attaching a separate fastener or an adhesive is eliminated.

The rails are formed in an advantageous embodiment in cross-section perpendicular to their longitudinal axes C-shaped or U-shaped. Preferably, the rolling element cage is separate in this cross section C-shaped or U-shaped. A plurality of rolling elements are arranged on a first side wall of the C-shape designed as a roof wall and / or on a second side wall of the C-shape designed as a bottom wall. The roof wall and the bottom wall are connected by a connecting wall.

In addition, it is also possible by means of said embodiments that the rail extraction device does not experience any undesired permanent impairment of the running action, even under high temperature influences, such as may occur in the case of a pyrolysis operation of a domestic appliance for preparing food.

Furthermore, the invention also relates to a household appliance, in particular for preparing food, which has at least one rail extension device according to the invention or an advantageous embodiment thereof. The household appliance is in particular a cooking appliance with a cooking space, can be introduced into the food for cooking. The Rail extension device is preferably arranged on a vertical side wall of the muffle, which limits the cooking space, and a mountable on the rail extension device Gargutträger can then be pushed in the depth direction of the household appliance and pulled out.

With information "top", "bottom", "front", "rear", "horizontal", "vertical", "depth direction", "width direction", "height direction" etc. are the intended use and proper arrangement of the device or indicated by the device and at a given then in front of the device and looking in the direction of the device given positions and orientations.

Further features of the invention will become apparent from the claims, the figures and the description of the figures. The features and combinations of features mentioned above in the description, as well as the features and feature combinations mentioned below in the description of the figures and / or shown alone in the figures, can be used not only in the respectively indicated combination but also in other combinations without the scope of the invention leave. Thus, embodiments of the invention are to be regarded as encompassed and disclosed, which are not explicitly shown and explained in the figures, but which emerge and can be produced by separated combinations of features from the embodiments explained. Embodiments and combinations of features are also to be regarded as disclosed, which thus do not have all the features of an originally formulated independent claim. Moreover, embodiments and combinations of features, in particular by the embodiments set out above, are to be regarded as disclosed, which go beyond or deviate from the combinations of features set out in the back references of the claims.

• 1 eine schematische perspektivische Darstellung eines Ausführungsbeispiels eines erfindungsgemäßen Haushaltsgeräts;
• 2 eine perspektivische Darstellung eines Ausführungsbeispiels einer Schienenauszugsvorrichtung an einem Traggestell;
• 3 die Darstellung der Schienenauszugsvorrichtung gemäß 2 in einer perspektivischen Schnittdarstellung;
• 4 eine vergrößerte Darstellung eines Teilbereichs eines Wälzkörperkäfigs mit Wälzkörpern der Schienenauszugsvorrichtung; und
• 5 eine perspektivische Darstellung eines weiteren Ausführungsbeispiels eines Wälzkörperkäfigs.

Embodiments of the invention are explained in more detail below with reference to schematic drawings. Show it:

• 1 a schematic perspective view of an embodiment of a household appliance according to the invention;
• 2 a perspective view of an embodiment of a rail extension device on a support frame;
• 3 the representation of the rail extension device according to 2 in a perspective sectional view;
• 4 an enlarged view of a portion of a Wälzkörperkäfigs with rolling elements of the rail extension device; and
• 5 a perspective view of another embodiment of a rolling element cage.

In the figures, identical or functionally identical elements are provided with the same reference numerals.

In 1 is a simplified perspective view of a household appliance 1 shown, which is designed for preparing food and is for example a cooking appliance. The household appliance 1 includes a housing 2 in which a cooking space 3 is formed by the walls of a muffle 4 is limited. In addition, the household appliance includes 1 a door 5 , which closes the cooking chamber 3 is formed and pivotally mounted on the housing 2 is arranged. In design and location to be understood merely as an example, is an operating and / or display device 6 available.

On opposite vertical side walls 4a and 4b the muffle 4 are several rail extension devices 7 , one of which is explained in more detail below, arranged.

The rail extension devices 7 are arranged in pairs opposite one another at the same altitudes along a height direction (y-direction), so that insertion levels are defined as well. On these paired rail extension devices 7 a food support, such as a grid or a fat pan or a baking tray can be placed and thus in the depth direction (z-direction) in the oven 3 be pushed into or out of the oven 3 be pulled out.

In 1 is an exemplary embodiment of a rail extension device in a perspective and simplified representation 7 shown. The rail extension device 7 includes in the embodiment shown a first rail 8th and a separate rail 9 , The rail extension device 7 has a longitudinal axis L on, which is also the longitudinal axis of the two rails 8th and 9 is. The two rails 8th and 9 are in the direction of this longitudinal axis, by which a displacement direction is defined, relative to each other displaceable. The two rails 8th and 9 are essentially the same length or one of the two rails is formed with a length between 80 percent and 100 percent of the length of the other rail. The first rail 8th represents an outer rail, which forms the running rail.

The second rail 9 is an inner rail and represents a solid rail, which means that it is on the inside of the side wall 4a is attached.

The first rail 8th surrounds the second rail 9 or the second rail 9 is in the first rail 8th misplaced or led. The two rails 8th and 9 are hollow, in particular trough-shaped.

In 2 is a perspective view of an embodiment of a rail extension device 7 shown. By way of example, here is also one for the rail extension device 7 separate support frame 10 shown on which the rail extension device 7 can be arranged. In such a configuration is then the rail extension device 7 not directly on a side wall 4a . 4b arranged, but it is then this support frame 10 directly on this side wall 4a . 4b arranged.

In 3 is the rail extension device 7 according to 2 shown in a vertical sectional view, wherein the sectional plane of the longitudinal axis L the rail extension device 7 having. This in 2 shown support frame 10 is in 3 not shown.

As can be seen, the rail extension device 7 a Wälzkörpervorrichtung 11, which is a separate unit to the two rails 8th and 9 is. The rolling element device 11 has here a separate, objective Wälzkörperkäfig 12, which is integrally formed here. The rolling element device 11 moreover comprises a plurality of rolling elements 13 and 14 attached to the rolling element cage 12 are movably mounted. In the embodiment shown is a plurality of upper rolling elements 13 , especially in the direction of the longitudinal axis L are arranged in series with each other, and a lower plurality of rolling elements 14 , which are also arranged in a corresponding row formed.

In the embodiment shown are the rolling elements 13 and 14 formed as spheres.

The rolling elements 13 here are in direct contact with a tread 15 placed on an inside of a roof wall of the first rail 8th is trained. The rolling elements 13 contact here with running areas 16 this tread 15 ,

In addition, the second rail points 9 on an outer side of another tread 18a, on which the rolling elements 13 with their running areas 16 walk in direct contact.

Correspondingly, an embodiment is also in the other rolling elements 14 provided, also with a tread 17 on an inner side of the bottom wall of the first rail 8th and preferably also with a tread 18b on an outside of a bottom wall of the second rail 9 is formed, with running areas 19 contact directly.

In 4 is a partial view of the Wälzkörperkäfigs in an enlarged view 12 with rolling elements 13 shown. As can be seen here, are in the Wälzkörperkäfig 12 , especially in the roof wall 20 , Recesses 21 formed, in which these rolling elements 13 are arranged.

The rail extension device 7 moreover, at least one of the previously mentioned components objectively separate film-like contact element, which on the Wälzkörperkäfig 12 is arranged. The rolling elements 13 and 14 are in direct contact with this film-like contact element.

By the film-like contact element is at least one damping of a movement noise of the rail extension device 7 when relative sliding between the rails 8th and 9 reached.

Im in 4 embodiment shown, the Wälzkörperkäfig 12 protruding ridges on which the recesses 21 limit. So is in 4 to recognize that in this embodiment, a first, out of the plane of the recess 21 protruding bridge 22 is formed, which is shaped in particular in the form of a bending tab. In the direction of the longitudinal axis L considered limited this projecting jetty 22 the recess 21 at one end. In the embodiment, it is provided here that on the in the direction of the longitudinal axis L opposite end of the recess 21 another, corresponding projecting web 23 is trained. These bridges 22 and 23 are designed so that the rolling elements 13 with play in the recess 21 is stored, during the movement of the rolling body 13 However, with a rolling element facing side 22a and a side facing the rolling element 23a can contact.

In particular, it is provided that the above-mentioned separate film-like contact element 24 at least on one of these pages 22a and 23a , especially on both sides 22a and 23a , is trained.

The film-like contact element 24 is in particular a graphite foil, which is thus formed in addition to the noise attenuation advantageously also for providing a lubricant.

The film-like contact element 24 preferably has a thickness between 0.1 mm and 1 mm, in particular between 0.2 mm and 0.5 mm. In particular, the foil-like contact element 24 a self-adhesive foil.

In 5 is a perspective view of another embodiment of a ball cage 12 shown, the C-shaped or U-shaped in cross-section perpendicular to the longitudinal axis L is trained. It may, not only in this embodiment, be provided that the film-like contact element 24 additionally also on an inner side of a connecting wall 25 which the roof wall 21 with a bottom wall 26 of the rolling element cage 12 connects, is arranged. It can also be provided that the entire Wälzkörperkäfig 12 by such a film-like contact element 24 wrapped or sheathed.

LIST OF REFERENCE NUMBERS

1

household appliance

2

casing

3

oven

4

muffle

4a

Side wall

4b

Side wall

5

door

6

Operating and / or display device

7

Rail expansion device

8th

rail

9

rail

10

supporting frame

11

Wälzkörpervorrichtung

12

Rolling Element

13

rolling elements

14

rolling elements

15

tread

16

overflow area

17

overflow area

18a

tread

18b

tread

19

overflow area

20

roof wall

21

recess

22

web

22a

page

23

web

23a

page

24

contact element

25

connecting wall

L

longitudinal axis

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 19949239 A1 [0004]
• DE 102012218007 A1 [0005]
• DE 202011051895 U1 [0006]

Claims (11)

A rail extension device (7) for a domestic appliance (1), having a first rail (8) and a second rail (9) separate therefrom, which is connected to the first rail (8), the rails (8, 9) being in the direction of their Longitudinal axes (L) relative to each other by means of a to the rails (8, 9) separate Wälzköpervorrichtung (10) of the rail extension device (7) are displaceable, wherein a rolling body (13, 14) of the Wälzkörpervorrichtung (10) for performing a rolling movement with a running area ( 16, 19) is coupled to a running surface (15, 16, 17, 18) of at least one rail (8, 9) and is arranged on a rolling body cage (12), characterized in that on the rolling body cage (12) one to the rolling body (13, 14) and to the rails (8, 9) separate, sheet-like contact element (24) is arranged, with which the rolling body (13, 14) is in direct contact and by which at least one damping of a movement noise of the rolling body (13, 14) a is educated. Rail extension device (7) after Claim 1 , characterized in that the film-like contact element (24) is elastically deformable. Rail extension device (7) after Claim 1 or 2 , characterized in that the film-like contact element (24) comprises a lubricant. Rail extension device (7) according to one of the preceding claims, characterized in that the film-like contact element (24) is arranged non-destructively detachable. Rail extension device (7) according to any one of the preceding claims, characterized in that the film-like contact element (24) is arranged fixedly on the Wälzkörperkäfig (12). Rail extension device (7) according to any one of the preceding claims, characterized in that the rolling body cage (12) has a recess (21) in which a rolling body (13, 14) is arranged relatively movable, wherein the recess (21) by at least one of the level of the recess (21) raised protruding web (22, 23) is limited, and at least one of the rolling elements (13, 14) facing and the rolling body (13, 14) contactable side (22a, 23a) of the web (22, 23) has the film-like contact element (24). Rail extension device (7) according to any one of the preceding claims, characterized in that the film-like contact element (24) at least partially at least on an inner side (25a) of the Wälzkörperkäfigs (12) is arranged. Rail extension device (7) according to one of the preceding claims, characterized in that the film-like contact element (24) is a graphite foil. Rail extension device (7) according to one of the preceding claims, characterized in that the film-like contact element (24) has a thickness between 0.1 mm and 1 mm, in particular between 0.2 mm and 0.5 mm. Rail extension device (7) according to one of the preceding claims, characterized in that the film-like contact element (24) is a self-adhesive film. Domestic appliance (1), in particular for preparing food, with at least one rail extension device (7) according to one of the preceding claims.

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