WO2018059952A1

WO2018059952A1 - Rail pull-out device with a non-destructively detachable running rail, and domestic appliance

Info

Publication number: WO2018059952A1
Application number: PCT/EP2017/073120
Authority: WO
Inventors: Angelika Namberger; Philipp Nather; Stefan Sojer
Original assignee: BSH Hausgeräte GmbH
Priority date: 2016-09-28
Filing date: 2017-09-14
Publication date: 2018-04-05
Also published as: DE102016218742A1

Abstract

The invention relates to a rail pull-out device (7) for a domestic appliance (1), comprising a first rail (8) which is a stationary rail and a separate second rail (9) which is a running rail and is connected to the first rail (8). The rails (8, 9) can be moved relative to each other in the direction of the longitudinal axes of the rails by means of a rolling element device (10). The rolling element device (10) has at least one rolling element unit (12) with a rolling element support (13) and at least one rolling element (14, 15) rotatably arranged thereon. The first rail (8) is connected to an assembly (17), which has the second rail (9) and the rolling element unit (12), in a non-destructively detachable manner, and the rolling element unit (12) is captively arranged on the second rail (9) when the first rail (8) is removed from the assembly (17). The invention also relates to a domestic appliance (1) comprising a rail pull-out device (7).

Description

Rail extension device with a non-destructive detachable

Running track and household appliance

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 rails are displaceable in the direction of their longitudinal axes relative to each other by means of a Wälzkörpervorrichtung 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 sheet, or a drip tray or grid, applied, 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

The weight of the food carrier is transmitted directly from one rail to the other via these balls. 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. If the system is smeared with a lubricant, especially a grease, these become unwanted

However, friction effects are significantly reduced. However, in these embodiments, a significant disadvantage is the fact that these lubricants for high

Temperatures, as they may occur, for example, in a pyrolysis of a said cooking appliance, are not suitable. For 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 dishwasher-safe, because at a

Washing process in the dishwasher, this lubricant is then washed out.

This results in running restrictions of the rails to each other. From DE 199 49 239 A1 a pull-out device for a food support in

Garraum of Garöfen known in which the Wälzkörpervorrichtung comprises rollers as rolling elements.

Rail extension devices are also relatively expensive, since they consist of many individual parts, each of which must be made individually, must be connected and possibly still have to be treated individually.

For example, cleaning and coating processes should be mentioned here, especially if such a rail extension device is strong

is exposed to different environmental conditions, as is the case in a cooking chamber of a cooking appliance. Even if this cooking appliance has a pyrolysis operation, temperatures of more than 500 ° C can also occur here. Different humidity conditions, as they can occur in the oven, as well

Deposits from a food to be cooked on the

Rail extension device can get lead to high demands on the rail extension device to withstand these influences.

In addition, it is also known that rail extension devices are arranged on a support frame in such a cooking chamber. If, in such an embodiment, a rail extension device is restricted or defective in function, then it is necessary to connect the complete system to the support frame

exchange. Even if such a rail extension device is detachably attached to such a support frame is in the conventional embodiments at Such at least function impaired rail extension devices whose complete replacement required.

External influences such as dirt and scratches or the like act here to a particular extent on a running rail of the rail extension device. Moreover, it is difficult and sometimes impossible to make internal components such as a Wälzkörpervorrichtung and / or specific parts of an internal fixed rail accessible in the known rail extension devices, which in particular makes the cleaning very difficult or sometimes impossible.

It is an object of the present invention to provide a rail extraction device as well as a household appliance, in which or at which the

Handling of the rail extension device is improved and in particular the cleanability of individual parts is simplified.

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

A rail extraction device according to the invention for a household appliance comprises a first rail and a separate second rail. The rails point

in particular in each case an elongated bar-like shape and the length of one of the two rails corresponds to at least a length 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. An essential idea of the invention is the fact that the

Rail extension device has a first rail as a fixed rail and the second rail has as a running rail. These two rails are by means of a

Wälzkörpervorrichtung slidably mounted to each other, wherein the Wälzkörpervorrichtung has at least one Wälzkörpereinheit with a Wälzkörperträger and at least one rotatably disposed thereon rolling elements. The first rail is non-destructively detachable with a second rail and the Wälzkörpereinheit

connected assembly. By this configuration, a

Rail extension device provided in which a specific rail, namely the outer rail or the running rail, reversible to the remaining

Assembly of the rail extension device can be mounted and disassembled. This is a significant advantage, since thus this rail can be easily replaced. As a result, the cleanability of this rail is much easier and even if it is scratched or otherwise damaged, a simple replacement is possible. Other components of the rail extension device must then not be dismantled and / or replaced with. In a further particular advantage of the invention, the Wälzkörpereinheit is in the removed from the assembly state of the first rail captively arranged on the second rail. This is another essential point of the invention, since thus in the removed state of the first rail Wälzkörpereinheit can not solve independently of the second rail and thus an undesirable falling apart of the components of the assembly is prevented. This in turn also allows a safe and quick installation of a first rail on the module, since the rolling element unit is then always present on the second rail and is not lost. Also, this is second

Wälzkörpereinheit then already in the correct position to the second rail, so that in turn, when mounting a first rail, these components are properly arranged to each other. The assembly of the first rail is then automatically correct to the other components and can be completed quickly. It is preferably provided that the first rail is formed in a groove-like manner in a cross-section perpendicular to a longitudinal axis of the rail extension device, which also corresponds to the longitudinal axis of the rails. As a result, it is stable in itself and yet formed reduced weight. Due to the channel shape, a simple assembly is also possible because the rail can be pushed onto the assembly unerringly.

In particular, it is provided that the Wälzkörperträger is integrally formed.

As a result, the number of components is reduced and in turn a stable in itself Component part provided. In addition, eliminates the installation effort in such a one-piece design.

In particular, it is provided that the Wälzkörperträger in a cross-section perpendicular to a longitudinal axis of the rail extension device like a clip, in particular C-shaped, is formed. At an opening of the staple shape of this Wälzkörperträger is shaped so that it is arranged captive in the direction of a hole axis of this opening on the second rail. This means that in an advantageous embodiment, the clear width of the opening is smaller than a dimensioned in this direction of the clear width extent of the second rail. A lateral slipping out of the first rail from this Wälzkörperträger is prevented. Since the rolling element carrier preferably embraces around this second rail in the manner of a bracket, this embodiment also provides a pull-off safety of the rolling element carrier in a horizontally oriented width direction which is perpendicular to the longitudinal axis of the

Rail extension device is oriented prevents. As a result, a particularly simple and yet very effective security against loss in this direction is given.

However, just this specific form of Wälzkörpenträgers then also allows that even in the vertical direction, which is also perpendicular to the longitudinal axis of the

Rail extension device is oriented, both up and down a separation from the second rail is prevented. By a single body, which has a specific shape, thus a highly effective captive security can be achieved in at least two spatial directions.

It is preferably provided that the second rail and / or the Wälzkörpereinheit have an axial securing, with which a captive security between the second rail and the Wälzkörpereinheit is formed in at least one direction along the longitudinal axis of the rail extension device. As a result of this configuration, the rolling body unit is viewed in the direction of the longitudinal axis and, in particular when the first rail is removed, does not detach itself from the second rail and, in the context, unrolls from the second rail. As a result, the captive security is made possible in all three spatial directions, especially in combination with the aforementioned advantageous embodiment of the shape of the rolling element carrier. Preferably, it is provided that the axial securing is non-destructive solvable, so that the Wälzkörpereinheit of the second rail, if required, is also removable. However, it is then necessary that this axial lock is deliberately released. By such a complete dismantling of the rail extension device, which is reversibly traceable and thus allows multiple defined assembly and disassembly, the individual components of the rail extension device can be considered separately and thus separated cleaned and / or maintained and / or replaced. In such an embodiment, then the modularity of the entire rail extraction device is particularly deep into the individual components

designed so that the above benefits are further improved.

In an advantageous embodiment, it is provided that the axial securing has at least one spring tab, which in an operating position an axial stop for the

Wälzkörpereinheit forms. Such a configuration allows a very simple element as axial protection. In particular, the spring tab is integrally formed in the second rail. Due to the configuration as a spring tab, the operation for setting a working position on the one hand and a non-working position on the other hand is particularly easy. Thus, the non-destructive detachable separation between the Wälzkörpereinheit and the second rail can be very easily and quickly perform.

Due to this configuration and the elastic shape of the axial securing the working position can always be taken automatically. If this spring tab from the working position, which is also the basic position, moved out by manual operation and moved to the non-working position, the simple separation between the Wälzkörpereinheit and the second rail can be done, and then on release of the spring tab, this moves again self-employed in her working position. By this configuration, then the assembly of the

Wälzkörpereinheit on the second rail particularly simple, since the spring tab practically does not have to be pressed directly from the working position to the non-working position by a tool or the like, but by simply driving over the Wälzkörpereinheit when attaching to the second rail this spring tab is then automatically pushed by the Wälzkörpereinheit from the working position to the non-working position and then performed a complete run over the spring tab of the Wälzkörpereinheit this spring tab then automatically moves back into the working position.

It is preferably provided that the Wälzkörpereinheit is slidably disposed in the detached state of the first rail in the direction of the longitudinal axis on the second rail relative to the second rail. This is advantageous if the rail extension device is designed such that even in the assembled final state of all rails and the Wälzkörpervorrichtung each other in a sliding movement of the two rails to each other and this

Wälzkörpervorrichtung in the direction of the longitudinal axis and thus also in the direction of displacement of the rails relative to the two rails is movable or is displaceable.

It can also be provided that the Wälzkörpervorrichtung has a further separate Wälzkörpereinheit having a Wälzkörperträger and at least one rotatably mounted thereon rolling elements, wherein the further Wälzkörpereinheit stationary on the second rail, in particular on a viewed in the direction of the longitudinal axis front end of the second rail is arranged. In such an embodiment, the Wälzkörpervorrichtung thus has two separate Wälzkörpereinheiten spaced apart along the longitudinal axis of the rail extension device are arranged. In particular, it is provided here that a Wälzkörpereinheit is arranged at a front end of the second rail, in particular fixedly arranged, and the other Wälzkörpereinheit is fixedly arranged on the first rail, in particular at a rear end of the first rail is arranged. By this embodiment, a particularly stable and robust running action of the rails is achieved to each other. Due to the advantageous local attachments of the respective Wälzkörpereinheiten these are also arranged quasi maximally spaced from each other when the rails are positioned in the collapsed state. Starting from this position then a particularly smooth motion control can be made possible. Even when the first rail is pulled out, this spacing, which is then reduced, also absorbs lever forces that still occur over a large displacement path in a particularly advantageous manner. It is preferably provided that the Wälzkörpereinheit is clipped in the mounted state of the first rail on the assembly on the first rail. This is an advantageous mounting option, since it can be implemented quickly and in the context of non-destructive detachable. In addition, however, a positionally secure attachment is made possible by this design.

In particular, it is provided that the first rail is mounted in the mounted state on the assembly peel-off on the assembly, the Abziehsicherung to remove the first rail is non-destructive solvable. By this configuration can then be prevented that when pulling out of the first rail, this is unintentionally pulled too far outward and would thus be solved undesirable from the second rail. This pull-off protection therefore also represents a pull-out stop.

In particular, it is provided that the Abziehsicherung has an axial stop, which is formed on the first rail. In particular, it is provided that this

Axial stop is elastic. As a result, on the one hand, an undesirably hard impact of the second rail when reaching the extended end position is avoided. In particular, however, this configuration also achieves that a fast non-destructive detachable coupling and decoupling of the first rail with or from the assembly is achieved and thus the disassembly of the first rail can also be very simple.

It may be provided that at least the first rail has a coating which is formed at least in regions. This coating can be a non-stick coating and / or have an enamel coating and / or a coating with silicon oxide and / or silicon dioxide. As a result, appropriate conditions can be created for different environmental conditions, such as prevail in a cooking chamber of a cooking appliance, so that the functionality of the rail extension device is kept permanently high. In addition, then just for a cooking appliance with a pyrolysis the possibility that the rail extension device can be left in this pyrolysis in the oven and then no adverse effects on the

Rail extension device done. Furthermore, the invention also relates to a household appliance, in particular for

Food preparation, which has at least one rail extension device according to the invention or an advantageous embodiment thereof. The

Domestic appliance is in particular a cooking appliance with a cooking chamber, can be introduced into the food for cooking. The rail extension device is preferably arranged on a vertical side wall of the muffle, which delimits the cooking space, and a food support that can be attached to the rail extension device can then be pushed in and pulled out in the depth direction of the household appliance. 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 feature combinations 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, are not only in the respectively indicated combination but also in others

Combinations usable, without departing from the scope of the invention. There are thus also embodiments of the invention as encompassed and disclosed, which are not explicitly shown and explained in the figures, but by separated

Feature combinations emerge from the described embodiments and can be generated. 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.

Embodiments of the invention are described below with reference to schematic

Drawings explained in more detail. Show it: Fig. 1 is a schematic perspective view of an embodiment of a household appliance according to the invention;

Fig. 2 is a perspective view of an embodiment of a

inventive rail extension device;

3 is an enlarged view of a portion of the rail extension device of FIG. 2.

Fig. 4 is a sectional view of the components of FIG. 3, in which this

Components are arranged in a different position to each other to Figure 3;

5 is a perspective sectional view of a further embodiment of a rail extension device; and

6 is a perspective view of subcomponents of

Rail extension device of FIG. 7 in a partially decoupled state from each other.

In the figures, the same or functionally identical elements are the same

Provided with reference numerals.

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

On opposite vertical side walls 4a and 4b of the muffle 4 a plurality of rail extension devices 7, one of which is explained in more detail below, arranged. The rail extension devices 7 are arranged in pairs opposite each other at the same elevations along a height direction (y-direction), so that in this way also insertion levels are defined. 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) are pushed into the cooking chamber 3 or pulled out of the cooking chamber 3.

In Fig. 1 is an embodiment of a perspective view

Rail extension device 7 shown. In the embodiment shown, the rail extension device 7 comprises a first rail 8 and a rail 9 separate therefrom. The rail extraction device 7 has a longitudinal axis L (FIG

Longitudinal axis of the two rails 8 and 9 is. The two rails 8 and 9 are in the direction of this longitudinal axis L, by which a displacement direction is defined, relative to each other displaceable. The two rails 8 and 9 are substantially 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 8 represents an outer rail which forms the running rail. The second rail 9 is a

Inner rail and represents a fixed rail, which means that it is attached to the inside of the side wall 4a.

The first rail 8 surrounds the second rail 9 or the second rail 9 is routed or guided in the first rail 8. The two rails 8 and 9 are hollow, in particular formed like a channel. In Fig. 2, an embodiment of a rail extension device 7 is shown, which has a longitudinal axis L, which in the assembled state shown in FIG. 1 of

Rail extension device 7 in the depth direction and thus in the z-direction of the

Household appliance 1 is oriented. The rail extension device 7 comprises in addition to the first rail 8 and the second rail 9, a Wälzkörpervorrichtung 10, which is a separate to the rails 8 and 9 component. The Wälzkörpervorrichtung 10 is in the embodiment shown in a gap 1 1 (Fig. 3), which is located between the

Rails 8 and 9 forms, arranged. In the embodiment shown it is provided that the Wälzkörpervorrichtung 10 in the assembled state of Rail extension device 7 with respect to the respective components to each other in the direction of the longitudinal axis L relative to both rails 8 and 9 slidably mounted in the intermediate space 1 1 and thus also in the direction of the longitudinal axis L.

can be moved accordingly. The rolling element device 10 comprises in the embodiment shown a single

Wälzkörpereinheit 12, which has a Wälzkörperträger 13 (Fig. 3) and rotatably mounted thereon rolling elements 14. The rolling elements 14 shown in FIG. 3 are here, for example, rollers which are mounted axially on the roller body carrier 13. The axial bearing is designed such that the axes of rotation of the rolling elements are oriented perpendicular to the longitudinal axis L.

As shown here in the example, in a first upper row along the longitudinal axis L first rolling elements 14 are arranged, and in a lower row also several, in particular three, further rolling elements 15 also axially mounted on the Wälzkörperträger 13.

As shown in Fig. 3, the Wälzkörperträger 13, which is integrally formed in a cross-section perpendicular to the longitudinal axis L a clip shape, in particular a C-shape. This is designed so that the Wälzkörperträger 13, the second rail 9 surrounds. It is provided in particular that a clear width w of an opening 16 of this clamp shape is smaller than a height h of the second rail 9 dimensioned in this direction of the clear width w. As a result, in the width direction and thus in the x-direction, which extends perpendicular to the longitudinal axis L and perpendicular to the height direction (y-direction), in which the inside width w and the height h dimensioned, is arranged captively on the second rail 9 , A temporal subtraction in this

Width direction of the Wälzkörpereinheit 12 of the second rail 9 is prevented. The rolling element carrier 13 is therefore shaped and arranged so that it is arranged in the direction of a hole axis B of the opening 16 captive on the second rail 9 and thus can not be deducted in the direction of this hole axis B.

In addition, by this clasping and the shaping of the

Wälzkörperträgers 13 and a release of Wälzkörpereinheit 12 in the height direction of the second rail 9 prevents, so here in a second direction in space a

Lost security is designed.

The first rail 8 is non-destructively releasably formed with a second rail 9 and the Wälzkörpervorrichtung 10 having assembly 17. The

Wälzkörpervorrichtung 10 is moreover arranged in captive from the assembly 17 state of the first rail 8 captive on the second rail 9.

FIG. 2 shows a state in which the first rail 9 has already been pulled off or decoupled from the assembly 17 in the axial direction to such an extent that the rolling body device 10 is already arranged outside the cavity or the gutter belly of the first rail 8. As can be seen in Fig. 2, the first rail 8 is formed as a hollow body, in particular trough-shaped and has in cross-section perpendicular to the longitudinal axis L preferably also a C-shape.

In the mounted state of the rail extension device 7, the second rail 9 and the Wälzkörpervorrichtung 10 are thus arranged in the cavity of the first rail 8.

Preferably, the second rail 9 and / or the Wälzkörpereinheit 12 a

Axialsicherung on, with which a captive security between the second rail 9 and the Wälzkörpereinheit 12 is formed in at least one direction along the longitudinal axis L of the rail extension device 7. Thus, this axial securing act at least forward or backward along the longitudinal axis L. In particular, this axial securing is non-destructive solvable, so that the

Wälzkörpereinheit 12 of the second rail 9 is reversibly removable and remountable.

It can be provided that this axial securing device has a spring tongue which, in the working position, forms an axial stop for the rolling element unit 12 in the direction of the

Longitudinal axis L forms. Preferably, it is provided that, viewed in the state mounted on the assembly 17 in the direction of the longitudinal axis L, the first rail 8 is secure against being pulled off at the

Assembly 17 is arranged, wherein the Abziehsicherung to remove the first rail 8 is non-destructive solvable. In particular, as shown in FIG. 3, a pull-off protection 18 may be formed, which is preferably a tab integrated in the rail 8. This Abziehsicherung 18 may be elastic, so that they can be spent from a working position to a non-working position and thus the non-destructive detachable and thus reversible assembly and

Disassembly of the first rail 8 is achieved on the assembly 17. FIG. 4 shows in a perspective sectional view this pull-off safety device 18 in a working position, a completely extended position of the first rail 8 relative to the second rail 9 being shown here. As can be seen here, the Abziehsicherung 18 is formed in its working position as obliquely downwardly oriented tab which is in the space 1 1 and thus also serves as a stop for the Wälzkörpereinheit 12 in the direction of this longitudinal axis L. As can be seen, the Wälzkörpereinheit 12 then proposes to this Abziehsicherung 18, so that here also quasi an extract stop is additionally formed by this Abziehsicherung 18. As can also be seen, on a ceiling wall 19 of the second rail 9, a raceway for the upper rolling elements 14 and on a bottom wall 20 of the second rail 9, a further raceway for the lower further rolling elements 15 is formed. The upper rolling elements 14 are also at the same time also on an inner side of a roof wall 21 of the first rail 8 and it is thus also on this inside a

corresponding career formed for the rolling elements 14. In addition, the lower further rolling elements 15 are at the same time also on a bottom wall 22 or on an inner side of this bottom wall 22 of the first rail 8, so that a corresponding track is formed here as well. The respective rolling elements 14 and 15 thus each contact at least one raceway of the first rail and at least one raceway of the second rail 9 in each case. FIG. 5 shows a further embodiment of a rail extension device 7 in a perspective sectional view. In this embodiment, the Wälzkörpervorrichtung 10 has two separate Wälzkörpereinheiten 12 and 12 '. The

Wälzkörpereinheit 12 'here has four rolling elements, in which case two upper rolling elements 14 and two lower further rolling elements 15 are provided which are connected to a

Wälzkörperträger 13 'are mounted, in particular are axially guided and can rotate accordingly. The second rolling element unit 12 comprises a rolling element carrier 13, on which an upper rolling element 14 and a lower rolling element 15 are arranged in the exemplary embodiment. This further Wälzkörpereinheit 12 is arranged stationary at a front end of the second rail 9. Again, the non-destructive detachable decrease of the first rail 8 is provided, as already to the previous one

Embodiment has been explained.

In Fig. 6, the rail extension device 7 according to FIG. 5 in perspective

Representation and shown partially disassembled, here the first rail 8 of the

Assembly 17 has already been removed. Here, the Abziehsicherung 18 is shown, in contrast to the embodiment of FIG. 2 to 4, but not in addition as

Axial stop 23 for the Wälzkörpereinheit 12 is used, since in this embodiment, the Wälzkörpereinheit 12 is fixedly arranged on the first rail 8, but non-destructively releasably thereto via the Abziehsicherung 18.

In the embodiment of FIGS. 5 and 6, the rail 8 can be removed from the assembly 17 together with the Wälzkörpereinheit 12 'attached thereto.

LIST OF REFERENCE NUMBERS

1 home appliance

2 housings

3 cooking space

4 muffles

4a sidewall

4b sidewall

5 doors

6 operating and / or display device

7 rail extension device

7a front end

7b rear end

8 rail

9 rail

10 rolling element device

1 1 gap

12, 12 'Wälzkörpereinheit

13, 13 'rolling element carrier

14 rolling elements

15 rolling elements

16 opening

17 assembly

18 pull-off protection

19 ceiling wall

20 bottom wall

21 roof wall

22 bottom wall

23 axial stop

B hole axis

h height

Wide light

L longitudinal axis

Claims

A rail extension device (7) for a household appliance (1), comprising a first rail (8) which is a fixed rail and a separate second rail (9) which is a running rail and is connected to the first rail (8) the rails (8, 9) in the direction of their longitudinal axes relative to each other by means of a

Wälzköpervorrichtung (10) are displaceable, wherein the Wälzkörpervorrichtung (10) at least one Wälzkörpereinheit (12) having a Wälzkörperträger (13) and at least one rotatably disposed thereon rolling elements (14, 15), characterized in that the first rail (8) non-destructive releasable with a second rail (9) and the Wälzkörpereinheit (12) having assembly (17) is connected, and the Wälzkörpereinheit (12) in the detached from the assembly (17) state of the first rail (8) captive on the second rail (9 ) is arranged.

Rail extension device (7) according to claim 1, characterized in that the first rail (8) in a cross section perpendicular to a longitudinal axis (L) of the rail extension device (7) is formed like a channel.

Rail extension device (7) according to claim 1 or 2, characterized in that the Wälzkörperträger (13) is integrally formed.

Rail extension device (7) according to one of the preceding claims, characterized in that the rolling body carrier (13) in a cross section perpendicular to a longitudinal axis (L) of the rail extension device (7)

clamp-like, in particular C-shaped, is formed, and at an opening (16) of the staple shape is formed so that it is arranged in the direction of a hole axis (B) of the opening (16) captive on the second rail (9). 5. rail extension device (7) according to one of the preceding claims,

characterized in that the second rail (9) and / or the

Wälzkörpereinheit (12) has an axial securing, with which a Loss of security between the second rail (9) and the Wälzkörpereinheit (12) in at least one direction along the longitudinal axis (L) of

Rail extension device (7) is formed.

6. rail extension device (7) according to claim 5, characterized in that the axial securing non-destructive, so that the Wälzkörpereinheit (12) of the second rail (9) is removable.

7. rail extension device (7) according to claim 6, characterized in that the axial securing means comprises at least one spring tab, which forms an axial stop for the Wälzkörpereinheit (12) in a working position.

8. rail extension device (7) according to one of the preceding claims,

characterized in that the Wälzkörpereinheit (12) in the detached from the assembly (17) state of the first rail (9) in the direction of the longitudinal axis (L) on the second rail (9) relative to the second rail (8) is slidably disposed.

9. rail extension device (7) according to one of the preceding claims,

characterized in that the Wälzkörpervorrichtung (10) has a further separate Wälzkörpereinheit (12 ') having a Wälzkörperträger (13') and at least one rotatably mounted thereon rolling elements (14, 15), wherein the further Wälzkörpereinheit (12 ') fixed to the first rail (8), in particular at a rear end of the first rail (8) viewed in the direction of the longitudinal axis (L) is arranged, in particular non-destructively releasably connected to the first rail (8).

10. rail extension device (7) according to claim 9, characterized in that the Wälzkörpereinheit (12 ') in the mounted state of the first rail (8) on the module (17) on the first rail (8) is clipped.

1 1. Rail extension device (7) according to one of the preceding claims,

characterized in that the first rail (8) in the on the assembly (17) assembled state is arranged tear-off on the module (17), wherein the Abziehsicherung (18) for removing the first rail (8) is non-destructive solvable.

Rail extension device (7) according to claim 1 1, characterized in that the Abziehsicherung (18) and an axial stop (23), which is formed on the first rail (8).

Rail extension device (7) according to claim 12, characterized in that the axial stop (23) is elastic. 14. Household appliance (1), in particular for preparing food, with at least one rail extension device (7) according to one of the preceding claims.