EP1970633A2 - Rail pull-out device and oven muffle with such a rail pull-out device - Google Patents

Abstract

The rail extension device (4,5) has a rail that is moved relative to another rail and has a magnet arrangement for fixing end position of the former rail relative to the latter rail. One end of the latter rail is assigned a magnet of one polarity and another magnet of another polarity is arranged on a rear end of the former rail. The magnet of the former rail hangs in contactless manner from the fixed end position opposite to the magnet of the latter rail.

Description

The invention relates to a rail extension device with at least one first rail, which is movable relative to a second rail, and a magnet arrangement for the end position fixation of the first rail relative to the second rail. Furthermore, the invention relates to a muffle for an oven, with such a rail extraction device.

From the DE 20 2004 019 219 U1 is a telescopic guide rail for furniture extracts known. The telescopic guide rail comprises a body rail fixedly arranged on a cabinet rail and an extractable side fixable extension rail and at least one arranged between the carcass rail and the drawer rail center rail. To couple the center rail with the pull-out rail, at least one permanent magnet is fastened to one of the rails and rests directly against the maximum or almost maximum pull-out position of the middle rail on an abutment of the other rail consisting of a magnetizable material. It is thus realized a magnet arrangement having holding magnets which are in direct contact. The magnets are disc-like elements, which are arranged so that their cylinder axis is parallel to the direction of withdrawal of the rails. The coupling magnetic effect is thus realized in the direction of the withdrawal direction.

In addition, from the DE 38 34 581 A1 a rail system for drawers known. A carcass rail, which is arranged on a body receiving the drawers, comprises a recess into which a leg of a drawer rail arranged on the drawer projects. Within this recess and on the leg of the drawer rail in the region of air gaps are opposing, the drawer load transmitting magnets arranged opposite polarity.

In both known from the prior art devices, the design is relatively complex and expensive. A variety of magnets is needed, and the Attachment relatively difficult. In addition, the functionality is very complex and error-prone.

It is an object of the present invention to provide a rail extension device which simplifies an end position fixation of rails of the device.

This object is achieved by a rail extension device according to claim 1.

A rail extraction device according to the invention comprises a first rail, which is movable relative to a second rail. In addition, the rail extension device has a magnet arrangement for the end position fixation of the first rail relative to the second rail. At least one end of the second rail is associated with a magnet of a first polarity and at a rear end of the first rail, a further magnet of a second polarity is arranged. Depending on the end position to be fixed, the magnet of the first rail is positioned contactlessly opposite the magnet of the second rail assigned to the respective end position. By this configuration, a reliable Endlagenfixierung can be achieved with a minimized number of magnets. Due to the non-contact arrangement of the respective magnets to each other for fixing an end position beyond the concept can be made much more flexible. The holder for fixing an end position can thus be generated without an immediate adhesion of the magnets together, which is constructive and arrangement-specific more freedom given.

It can be provided that the magnets of the second rail and the magnet of the first rail are arranged outside the rail coupling. The rail coupling is understood to mean the intermeshing or guiding of one rail through the other. As a result, damage to a magnet can be prevented by the movement of the rails relative to one another, since, for example, abutment or slippage or slippage along a rail on a magnet can be prevented. In particular, a magnet is thus arranged outside the movement space of a rail. Due to this configuration outside of such Rail coupling can keep the functionality high and the damage or wear of the magnets can be minimized.

Preferably, the two magnets of the second rail are arranged directly on the second rail, in particular outside the rail coupling with the first rail. Such an integral embodiment also makes it possible to achieve a relatively small installation space of such an attachment on the outside of the magnets.

The magnets are preferably designed as raw magnets. In particular, they are thus not designed as holding magnets. In a configuration as a raw magnet, these have no additional enclosure or the like. As a result, the use in relatively highly temperature-stressed environments is possible without the functionality is impaired or damage could occur. However, such damage or functional impairment can occur in such temperature-stressed environments but with magnet magnets, which are usually surrounded by a sheath made of plastic, which can then melt.

Preferably, the magnets are formed of a material with high temperature resistance, in particular with a temperature resistance up to about 350 ° C. As a result, the use in household appliances, such as ovens or the like without functional impairment and damage to the rail extension device can be ensured.

It is particularly preferred if the magnets are made of SmCo. Magnets formed of such a material can be used in environments subject to high temperatures, in particular up to 350 ° C., and with a possible energy product of 175 kJ / m ^{3 they have} an appreciably higher attraction force than other materials for magnets.

In particular, when used in temperature-stressed environments up to 350 ° C, such a material formation of the magnets taking into account the attraction and the cost in comparison to other magnets is particularly advantageous.

In addition, these raw magnets are also particularly suitable for non-contact interaction with a magnet of a different polarity and thus for efficient Endlagenfixierung compared to magnetic clamps.

It can be provided that the magnets of the second rail are arranged below the second rail. As a result, they can be arranged relatively space-saving and are not disturbed for the operation and functionality of the rail extension device.

It can also be provided that the magnets of the second rail are arranged in the rail coupling with the first rail. This allows a particularly compact and space-minimized design of the rail extension device. In such an embodiment, the magnets of the second rail are thus arranged quasi in the movement path of the first rail.

It is preferably provided that the magnets of the second rail are each arranged on a carrier part, which carrier parts extend above arranged on the first rail stop elements. By this configuration, on the one hand, a mechanically stable guidance of the rails to each other can be ensured and beyond the stable mounting of the magnets are generated. Within the rail coupling, therefore, the magnets are fixed and can be positioned functionally optimized to each other by the structural configurations and arrangements of the support members and stop elements.

The stop elements arranged at the ends of the first rail are preferably designed for magnetic interaction with the magnets of the second rail. A stop element in an end position is arranged without contact and spaced from a magnet of the second rail opposite. Again, thus a highly effective Endlagenfixierung can be achieved. In particular, when the magnets of the second rail are formed as a raw magnet, it is advantageous that they are not exposed to shock load. Since these are preferably arranged in the specific embodiment in the region of the rail coupling, it is advantageous if these magnets of the second rail do not serve as a stop for the first rail in a defined end position. Preferably, the stop element is provided for that purpose End position definition is directly connected to the support member and thus the stop between the stop element of the first rail and a support part of the second rail is realized. This is in particular designed so that in this stop for determining an end position of the provided in this end position fixing magnet of the second rail spaced from the stop element is arranged. By the thus generated air gap between the stopper member and the magnet in this end position also a shock load and direct adverse effect on the magnet formed as a raw magnet can be prevented and yet a magnetic interaction for Endlagenfixierung be guaranteed without contact. In this embodiment, a relatively flat-construction device can be created because the stop element can be made relatively narrow in lateral extent and yet can ensure sufficient magnetic interaction with the opposite magnet of the second rail.

It can be provided that the stop element is formed at the end facing a magnet at least double-walled. The area provided for the magnetic interaction can thereby be increased.

It is preferably provided that the second rail is a rail attached to a body. This is thus fixed and the first rail can be moved relative to this fixed second rail.

It can also be provided that the second rail is a middle rail of a telescopic rail arrangement. The second rail is then movable relative to a further third rail attached to a body. Furthermore, this designed as a middle rail second rail is then arranged to form a further pull-out rail first rail. This further pull-out rail can then be a further middle rail or a displaceable end rail of the rail extension device.

Another aspect of the invention relates to a muffle for an oven comprising a rail extraction device according to the invention or an advantageous embodiment thereof. Especially the extraction of baking trays or support grids in an oven can be significantly facilitated by this rail extraction device.

Both when pulling out and when inserting the end positions of the rails can be fixed sufficiently fixed and thus the placement and removal of a baking tray done easily. The sliding back and forth of the individual rails of the rail extension device and thus the difficult placement of a baking sheet or a grid or the like on the rails can be prevented.

In particular, when using the rail extension device in such a muffle of a baking oven, it is particularly advantageous if the magnets are designed as raw magnets with high functionality even at high temperatures. If such high temperatures occur in such an oven, the functionality of the rail extension device must be ensured here as well. The rail extension device can be realized with minimized components, since for magnets which are arranged within the rail coupling, only two magnets are required in order to fix the two end positions can.

In an embodiment in which the magnets are arranged outside the rail coupling, in addition to a trouble-free extension and retraction from the fixing points, a clearly noticeable feedback to the operator when reaching the fixing points can be ensured. Due to the non-contact design of the end position fixation by means of the magnets no friction is given, whereby a low-wear and low-noise system is possible.

In addition, can be ensured by such a configuration, a relatively insensitive system with respect to distance tolerances between the opposing magnets. Even with larger distance tolerances, the functionality with regard to the end position fixation can still be guaranteed.

Corresponding advantages also result in an embodiment in which the magnets are arranged in the rail coupling. In addition, in such an embodiment, a Überauszugsweg when used in a muffle for an oven continues to be completely available. An over extension means in this context that the rails can be pulled out of the muffle so far that a baking sheet or a grid is completely pulled out of the muffle and thus can be lifted almost vertically upwards without it abutting an edge of the muffle or the like.

Fig. 1

eine perspektivische Darstellung eines Backofens mit einer Muffel und einer Schienenauszugsvorrichtung;

Fig. 2

eine perspektivische Darstellung eines ersten Ausführungsbeispiels einer erfindungsgemäßen Schienenauszugsvorrichtung;

Fig. 3

eine perspektivische Darstellung eines zweiten Ausführungsbeispiels einer erfindungsgemäßen Schienenauszugsvorrichtung;

Fig. 4

eine vergrößerte Teildarstellung eines Ausschnitts gemäß der Ausführung in Fig. 3.

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

Fig. 1

a perspective view of a baking oven with a muffle and a rail extension device;

Fig. 2

a perspective view of a first embodiment of a rail expansion device according to the invention;

Fig. 3

a perspective view of a second embodiment of a rail expansion device according to the invention;

Fig. 4

an enlarged partial view of a section according to the embodiment in Fig. 3 ,

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

In Fig. 1 is shown in a schematic representation of a baking oven 1, which has a muffle 2. The muffle 2 has walls which delimit a back room 3. Front side, the muffle 2 is closed by a door, not shown, of the furnace 1. The muffle 2 has at least two opposite rail extension devices 4 and 5, which are arranged on the side walls of the muffle 2. On this rail extension devices 4 and 5, a baking sheet or a grid or the like can be placed. In the Fig. 1 schematically illustrated rail extension devices 4 and 5 can be pulled forward. The pull-out path may preferably have a length such that a baking sheet or grid placed thereon can be pulled out with an over-extension length. This means that a baking sheet or a grid can be pulled out so far from the oven cavity 3 that it is almost completely outside the Backoffengarraums 3 is arranged and can be lifted vertically upwards without abutting a front edge of the muffle 2.

In Fig. 2 a first embodiment of a rail extension device 4 is shown. This rail extension device 4 is shown as representative of the further rail extension device 5. In the exemplary embodiment, the rail extension device 4 comprises a first rail 41, which can be pushed back and forth relative to a second rail 42 in the longitudinal direction (arrow direction).

The second rail 42 is fixedly mounted on the side wall of the muffle 2 and only the first rail 41 can be pulled out or inserted.

The two rails 41 and 42 are connected to each other with a rail coupling and thus virtually merged. At a first front end 42a of the second rail 42 is a single first magnet 6, and at a second rear end 42b of the second rail 42, a single second magnet 7 is arranged. In addition, a third magnet 8 is arranged at a rear end 41 a of the first rail 41. In the in Fig. 2 As shown, the three magnets 6, 7 and 8 are positioned outside the rail coupling between the first rail 41 and the second rail 42. In particular, the two magnets 6 and 7, which are associated with the second rail 42, arranged stationary and positioned below the second rail 42. In the embodiment shown, these are connected to the second rail 42 via retaining webs (not further identified). However, it can also be provided that these two magnets 6 and 7 are arranged directly on a side wall of the muffle 2.

The first rail 41 associated with the single magnet 8 is connected via a holding web 41 b to the first rail 41 and also arranged outside of the rail coupling between the rails 41 and 42.

The minimum number of magnets 6, 7 and 8 enables a two-sided end position fixation of the first rail 41 relative to the second rail 42.

The magnets 6 to 8 are formed as a raw magnet and positioned so that they are arranged without contact in an end position fixation and thus separated by an air gap. The two magnets 6 and 7, which are associated with the second rail 42, have a first polarity, wherein the magnet 8, which is associated with the first rail 41, has a second polarity.

In the embodiment, the three magnets 6 to 8 of a high temperature resistant material, in particular SmCo formed.

In the exemplary illustration in FIG Fig. 2 a situation is shown in which the first rail 41 is fully inserted and thus the rail extension device 4 has a minimum length. In this position, the first rail 41 is fixed relative to the second rail 42 in this end position, to which the two magnets 7 and 8 are arranged contactlessly opposite each other.

If the first rail 41, starting from the in Fig. 2 drawn representation to the front (in the figure shown to the left), it is released via a relatively soft feel feel this fixed in the end position shown state and fixed in the fully extended state, a second end position. In this second end position then the magnet 6 is the magnet 8 without contact. Due to the magnetic interaction, this second end position can also be fixed in position.

Due to the non-contact design, the end position fixation can be carried out without friction and also without noise.

In Fig. 3 a further embodiment of a rail extension device 4 is shown. In this perspective view, the rail extension device 4 is formed as a telescopic device and comprises in addition to the formed as a middle rail second rail 42 designed as a front pull-out rail first rail 41 and a third rail 43. The third rail 43 is formed for attachment to the muffle 2 and thus fixed , Extracted and thus movable relative to each other are the two rails 41 and 42. In the in Fig. 3 As shown, the rail extension device 4 is extended to a maximum length. For this purpose, an end position fixation between the second rail 42 and the third rail 43 in Area I provided. In addition, a further Endlagenfixierung between the second rail 42 and the first rail 41 in the region of the ends 42 a and 41 a is provided.

At the in Fig. 3 shown embodiment of the rail extension device 4 turn two magnets 6 and 7 are arranged on the second rail 42, which are provided in this embodiment within the rail coupling.

The magnets 6 and 7 are respectively on support parts 42 c ( Fig. 4 ), in particular welded.

To generate the magnetic interaction with these magnets 6 and 7, on the one hand, a stop element 9b designed for magnetic interaction is arranged on the third rail 43. In a corresponding manner, a stop element 9a is arranged on the first rail 41 at the first end 41 a. Both stop elements 9a and 9b can fix the respectively set end positions in interaction with the magnets 6 and 7, which are spaced apart from each other and arranged without contact. By a minimum number of magnets and corresponding additional elements, the end positions can be reliably maintained even with such a telescope design. Also in such an embodiment according to Fig. 3 the overdraw can be made possible.

For further explanation and more detailed illustration is in Fig. 4 a partial section in the area I shown. It can be seen that the rails 42 and 43 are guided into each other and thus there is a rail coupling. In this rail coupling, the magnet 7 and the stopper member 9b is arranged. It can be seen that the carrier part 42c is arranged in the longitudinal direction of the rail extension device 4 and extends above the stop element 9b. On this support member 42c of the magnet 7 is welded.

In the illustrated fixed end position between the rail 42 and the rail 43, the stopper member 9b is spaced from the magnet 7 by an air gap 10. The stop is thus realized in this embodiment between the stop element 9b and the support member 42c. This is particularly advantageous since a direct abutment of the stop element 9b on the magnet 7 is thus prevented. There at Rohmagneten such a striking and thus a shock load to be prevented so as not to affect the functionality, such a configuration is particularly advantageous. When reaching the end position thus does not strike the stop element 9b directly to the magnet 7, but strikes the support member 42c. Thus, the end position can be accurately determined and held on the non-contact magnetic interaction between the magnet 7 and the stop element 9b. The stop element 9b is preferably double-walled on the side facing the magnet 7. Thereby, the area available to the magnet 7 for tightening can be increased.

In an analogous manner, the embodiment is formed at the opposite attachment point between the rail 41 and the rail 42. The stop elements 9a and 9b can be formed relatively flat, so that by the lateral dimensions (perpendicular to the longitudinal direction of the rail system), a relatively thin and space-minimized rail extraction device 4 can be made possible.

In addition, by this plate-like stop element 9a and 9b, a holder or guide rail 42 in the rail 41 and the rail 43 are made possible. This guide is particularly effective due to the longitudinal arrangement of the support member 42c, which ensures secure guidance in the longitudinal direction in conjunction with other elements. The stop element 9b is arranged on a lower, the rail 43 final web 43a, through which the guide of the rail 42 can be stabilized.

Claims (14)

A rail extension device having at least a first rail (41, 42, 43) which is movable relative to a second rail (41, 42, 43), and with a magnet arrangement (6, 7, 8, 9a, 9b) for fixing the end position of the first rail (41, 42, 43) relative to the second rail (41, 42, 43), characterized in that at least one end (42a, 42b; 41 a) of the second rail (41, 42, 43) is a magnet (6, 7 , 8, 9a, 9b) is associated with a first polarity, and at a rear end (42a, 42, 41a) of the first rail (41, 42, 43) another magnet (6, 7, 8, 9a, 9b) a second polarity is arranged, and the magnet (6, 7, 8, 9a, 9b) of the first rail (41, 42, 43) depending on the end position to be fixed contactless one of the magnets (6, 7, 8, 9a, 9b ) of the second rail (41, 42, 43) is positioned opposite. A rail extension device according to claim 1, characterized in that the magnets (6, 7, 8, 9a, 9b) of the second rail (41, 42, 43) and the magnet (6, 7, 8, 9a, 9b) of the first rail ( 41, 42, 43) are arranged outside the rail coupling. Rail extension device according to claim 1 or 2, characterized in that the two magnets (6, 7, 8, 9a, 9b) of the second rail (41, 42, 43) on the second rail (41, 42, 43), in particular outside the Rail coupling with the first rail (41, 42, 43) are arranged. Rail extension device according to one of the preceding claims,
characterized in that the magnets (6, 7, 8, 9a, 9b) are formed as a raw magnet. Rail extension device according to one of the preceding claims, characterized in that the magnets (6, 7, 8, 9a, 9b) are made of a material with high temperature resistance, in particular up to 350 ° C, are formed. Rail extension device according to one of the preceding claims, characterized in that the magnets (6, 7, 8, 9a, 9b) are made of SmCo. Rail extension device according to one of the preceding claims, characterized in that the magnets (6, 7, 8, 9a, 9b) of the second rail (41, 42, 43) below the second rail (41, 42, 43) are arranged. Rail extension device according to one of the preceding claims, characterized in that the magnets (6, 7, 8, 9a, 9b) of the second rail (41, 42, 43) are arranged in the rail coupling with the first rail (41, 42, 43) , Rail extension device according to claim 8, characterized in that the magnets (6, 7, 8, 9a, 9b) are each arranged on a carrier part (42c), which carrier parts (42c) above of the first rail (41, 42, 43) arranged stop elements (9a, 9b) extend. Rail extension device according to claim 8 or 9, characterized in that at the ends of the first rail (41, 42, 43) arranged stop elements (9a, 9b) for magnetic interaction with the magnets (6, 7, 8) of the second rail (41 , 42, 43) are formed and a stop element (9a, 9b) in an end position without contact a magnet (6, 7, 8) of the second rail (41, 42, 43) is arranged opposite. Rail extension device according to one of claims 8 or 9, characterized in that a stop for fixing an end position between the rails (41, 42, 43) by the abutment of the stop element (9a, 9b) on a support member (42c) is predetermined. A rail extension device according to one of the preceding claims, characterized in that the second rail (41, 42, 43) is a rail (41, 42, 43) fastened to a body (2). A rail extension device according to any one of the preceding claims 1 to 11, characterized in that the second rail (41, 42, 43) is a center rail of a telescopic rail arrangement which relative to a rail (41, 42, 43) fixed to a body (2) relative to a further pull-out rail (41, 42, 43) is movable. Muffle for an oven (1) with a rail extension device (4, 5) according to one of the preceding claims.

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