TELESCOPIC EXTENSION

Abstract

A telescopic extension with a stationary inner rail and an outer rail mounted so as to be movable relative to the stationary inner rail between an insertion end position and an extension end position in an insertion direction and an extension direction opposite thereto. The telescopic rail is provided and designed for detachable mounting on a side rack which includes a front vertical grid bar and a rear vertical grid bar spaced apart therefrom and substantially parallel thereto, and at least one support bracket which has a horizontal section and, at opposite ends of the horizontal section, front and rear end sections which are each angled substantially perpendicularly with respect to the horizontal section, the front end section being connected to the front vertical grid bar and the rear end section being connected to the rear vertical grid bar.

Claims

1. A telescopic extension with a stationary inner rail and an outer rail mounted so as to be movable relative to the stationary inner rail between an insertion end position and an extension end position in an insertion direction and an extension direction opposite thereto, and optionally with a middle rail arranged between the inner rail and the outer rail and mounted so as to be movable relative thereto, and optionally with a support plate fastened to the outer rail, said telescopic extension being provided and adapted to be detachably mounted on a side rack having a front vertical grid bar and a rear vertical grid bar spaced therefrom and substantially parallel thereto and at least one retaining bracket which has a horizontal section and, at opposite ends of the horizontal section, front and rear end sections which are each angled substantially perpendicularly with respect to the horizontal section, the front end section being connected to the front vertical grid bar and the rear end section being connected to the rear vertical grid bar, wherein a front quick-release fastener and a rear quick-release fastener for detachably mounting the telescopic extension to the side rack are fixed to the stationary inner rail at a distance from each other, wherein the front quick-release fastener has a U-shaped section for engagement with the front vertical grid bar and/or with the front angled end portion of the support bracket, and the rear quick-release fastener has a U-shaped section for engagement with the rear vertical grid bar and/or with the rear angled end portion of the support bracket, wherein the openings of the U-shaped sections of the quick-release fasteners are oriented in opposite directions facing away from the other quick-release fastener, wherein a spring element is arranged in fixed connection with the rear quick-release fastener and/or the stationary inner rail; wherein this spring element, in the mounted state of the telescopic extension, is supported with a support surface in the insertion direction on the side rack, preferably on the rear vertical grid bar and/or the rear angled end portion of the retaining bracket, and, in the relaxed or pretensioned state, holds the U-shaped section of the front quick-release fastener in engagement with the front vertical grid bar and/or with the front angled end section of the retaining bracket, wherein the stationary inner rail is movable over a distance by applying a force to the stationary inner rail in the insertion direction and against the spring force of the spring element, such that the U-shaped section of the front quick-release fastener is disengageable from the front vertical grid bar, wherein a safety lug is arranged on an element of the telescopic extension which is mounted so as to be displaceable relative to the stationary inner rail in such a way that it comes to rest in the insertion direction against the side rack, preferably against the front vertical grid bar or against the end portion which is angled at the front relative to the horizontal portion of the retaining bracket, when the moveably mounted outer rail is displaced into its insertion end position or when a force acts on the moveably mounted outer rail in its insertion end position in the insertion direction and against the spring force of the spring element, and blocks a movement of the stationary inner rail over a distance that the U-shaped section of the front quick-release fastener can be brought out of engagement with the front vertical grid bar and/or with the front angled end portion of the retaining bracket, wherein the stationary inner rail, the outer rail which is movably mounted relative to the stationary inner rail, and the support plate which is secured to the outer rail are made of sheet steel, and the safety lug is formed in one piece with the movable mounted outer rail.

2. The telescopic extension according to claim 1, wherein the safety lug made of the steel plate of the moveably mounted outer rail is formed at its end located in the extension direction as a lug bent up perpendicularly to the extension direction of the moveably mounted outer rail.

3. The telescopic extension according to claim 1, wherein the support plate optionally attached to the movable outer rail has a support surface on the upper side for supporting a holder, preferably a cooking tray.

4. The telescopic extension according to claim 1, wherein the support plate optionally attached to the movable outer rail has an end stop at the end located in the insertion direction, which is formed in one piece with the support plate as a lug bent out of the steel plate of the support plate perpendicularly to the insertion direction and forms a stop against displacement of a holder placed on the support plate in the insertion direction beyond the end of the support plate located in the insertion direction.

5. The telescopic extension according to claim 1, wherein the support plate optionally fastened to the movable outer rail has an end cap at the end located in the extension direction, which end cap is formed in one piece with the support plate as a lug bent out of the steel sheet of the support plate in the direction of the movable outer rail and at least partially covers the end of the movable outer rail located in the extension direction.

6. The telescopic extension according to claim 1, wherein the surface of the support plate optionally attached to the movable outer rail has at least partially a coating produced by PVD, CVD, plasma CVD, plasma spraying or high-speed flame spraying or deposited by electroplating.

7. The telescopic extension according to claim 1, wherein on the side of the outer rail facing away from the inner rail at least two hook-shaped lugs, and on the side of the optional support plate facing the outer rail are arranged recesses formed for engagement with the hook-shaped lugs on the outer rail for releasably fastening the support plate (1c) to the outer rail or wherein at least two hook-shaped lugs are provided on the side of the optional support plate facing the outer rail, and recesses formed on the support plate for engagement with the hook-shaped lugs are arranged on the side of the outer rail facing away from the inner rail for releasably fastening the support plate to the outer rail.

8. The telescopic according to claim 7, wherein the recesses formed on the outer rail or on the support plate are fixed by welding, spot welding, riveting or screwing.

9. The telescopic extension according to claim 7, wherein the hook-shaped lugs are formed in one piece with the outer rail or the support plate by cutting or punching out and bending from the steel sheet.

10. The telescopic extension according to claim 1, wherein the spring element is a leaf spring element which is arranged between the U-segments of the U-shaped section of the rear quick-release fastener and can be biased with the spring force in the insertion direction, wherein the support surface of the spring element, which is provided for supporting the spring element in the insertion direction on the side rack, is arranged at a distance from the U-basis of the U-shaped section of the rear quick-release fastener connecting the U-segments.

11. The telescopic extension according to claim 1, wherein, in the mounted state of the telescopic extension on the side rack, the U-shaped section of the rear quick-release fastener engaging around the rear vertical grid bar or the rear angled end section of the retaining bracket is at such a distance from the U-shaped section of the front quick-release fastener that grasps around the front vertical grid bar or the front angled end portion of the retaining bracket that the U-segments of the U-shaped section of the rear quick-release fastener embrace the rear vertical grid bar or the rear angled end portion of the retaining bracket, without the U-basis of the U-shaped section of the rear quick-release fastener that connects the U-segments coming into contact with the rear vertical grid bar or the rear angled end portion of the retaining bracket, when the U-shaped section of the front quick-release fastener embraces the front vertical grid bar or the front angled end portion of the retaining bracket in such a manner that the U-basis of the U-shaped section of the front quick-release fastener connecting the U-segments is in abutment with the front vertical grid bar or with the front angled end portion of the retaining bracket.

12. The telescopic extension according to claim 1, wherein a sliding switch extending in the extension direction is arranged at the end of the stationary inner rail located in the extension direction.

13. The telescopic extension according to claim 1, wherein the front quick-release fastener and the rear quick-release fastener each have support portions which, in the assembled state of the telescopic extension, rest on the side rack on the angled end portions of the retaining bracket.

14. The telescopic extension according to claim 1, wherein the front quick-release fastener and/or the rear quick-release fastener has an abutment portion which, in the assembled state of the telescopic extension, abuts the side rack on the side of the vertical grid bar facing the stationary inner rail.

15. The telescopic extension according to claim 1, wherein the telescopic extension is provided and designed as a cooking tray for detachable mounting on a side rack of a baking oven, preferably a pyrolysis baking oven.

16. A quick-release fastener system for mounting cooking trays in an oven, comprising a pair of mirror-symmetrically shaped side racks which are fixed or fixable to opposite inner side walls of the oven, and at least one pair of the telescopic extensions according to claim 1.

Description

FIGURES

[0053] Further advantages, features and possible applications of the present invention will become clear from the following description of an embodiment according to the invention and the accompanying figures. In the figures, like elements are identified using like reference signs.

[0054] FIG. 1 shows a perspective schematic view of an embodiment of a side rack of a baking oven with an embodiment of a telescopic extension according to the invention mounted thereon, viewed obliquely from the front onto the support plate.

[0055] FIG. 2 shows the embodiment according to FIG. 1 without the support plate according to the invention in the same viewing direction as in FIG. 1.

[0056] FIG. 3 shows the embodiment according to FIG. 1 with an oblique view of the inner rail from behind.

[0057] FIG. 4 shows a schematic perspective view of the support plate according to the invention, viewed obliquely from behind, as in FIG. 3.

[0058] FIG. 5 shows a cross-sectional view of the embodiment according to FIG. 1, looking in the insertion direction at the front of the telescopic extension according to the invention mounted on the side rack, wherein the section in the front area of the telescopic extension is behind the end cap of the support plate but in front of the safety lug on the outer rail, and the balls of the ball bearings between the rail elements are hidden.

[0059] FIG. 6 shows a cross-sectional view of the embodiment according to FIG. 1, viewed in the extension direction.

[0060] FIG. 7 shows schematic views of an alternative embodiment of a support plate according to the invention, in which the recesses for hook-shaped lugs on the outer rail are formed in one piece with the support plate and are shaped in a section folded over along the lower edge of the support plate in the direction of the outer rail.

[0061] The figures show an embodiment according to the invention of a telescopic extension 1 designed as a full extension with a stationary inner rail 1a, a middle rail 1c mounted to move relative to the stationary inner rail via a ball bearing, and an outer rail 1b mounted to move relative to the middle rail via a further ball bearing. As shown in FIGS. 5 and 6, the stationary inner rail 1a and the movable outer rail 1b have a profile that is essentially C-shaped in cross-section with ball raceways on the opposite C-legs of the respective rail profile and a rail back connecting the two C-legs. The balls of the ball bearings are not shown in the figures.

[0062] The telescopic extension 1 is mounted on a side rack 2, preferably a side rack fixed or fixable to the muffle side wall of a baking oven, which has a front vertical grid bar 2a and a rear vertical grid bar 2b spaced apart from it, and arranged substantially parallel thereto, and a plurality of retaining brackets 3 arranged one above the other. Each of the retaining brackets consists of a horizontal section 3c and front and rear end sections 3a and 3b, which are angled substantially vertically at opposite ends of the horizontal section 3c, and welded with their free ends to the vertical grid bars 2a and 2b respectively.

[0063] In this embodiment, the telescopic extension 1 furthermore comprises a support plate 1d attached to the outer rail. FIGS. 1, 3, 5 and 6 show the telescopic extension 1 with the support plate 1d attached to the outer rail, while FIG. 2 shows the telescopic extension 1 without the support plate, and FIG. 4 shows a view of the support plate 1d alone. FIG. 7 shows an alternative embodiment of a suitable support plate 1d according to the invention.

[0064] The telescopic extension 1 is detachably mounted to the vertical grid bars 2a and 2b, as well as a retaining bracket 3 of the side rack 2 by means of two front and rear quick-release fasteners 4 and 5 fixed to the stationary inner rail 1a at a distance from each other in such a manner that all rail elements of the telescopic extension 1 are arranged below the retaining bracket 3. The quick-release fasteners 4 and 5 each have a U-shaped section 4a and 5a, respectively, with their openings oriented in opposite directions facing away from the other quick-release fastener. The U-shaped section 4a of the front quick-release fastener 4 grips the front vertical grid bar 2a, and the U-shaped section 4b of the rear quick-release fastener 5 grips the rear vertical grid bar 2b.

[0065] In the present embodiment, a leaf spring element (not shown) is arranged on the rear quick-release fastener 5 between the U-segments of the U-shaped section 5a; this leaf spring element is supported in the assembled state of the telescopic extension 1 with a support surface biased in the insertion direction on the rear vertical grid bar 2b, holds the U-shaped section 4a of the front quick-release fastener 4 in engagement with the front vertical grid bar 2a, and presses the U-basis of the U-shaped section 4a of the front quick-release fastener 4, which connects the U-segments, against the front vertical grid bar 2a in the extension direction.

[0066] At the end of the stationary inner rail 1a of the telescopic extension, which is located in the extension direction, a sliding switch 1k which extends in the extension direction is arranged; in this embodiment, it is designed as a plate welded to the rail back of the inner rail 1a and bent through 90? at the free end. The bent-over portion of the sheet provides an easily accessible surface for the user to apply a force in the insertion direction, for example by pressing with the thumb in the insertion direction, to displace the stationary inner rail 1a in the insertion direction and against the spring force of the spring element over a distance for disassembly of the telescopic extension, sufficient to disengage the U-shaped section 4a of the front quick-release fastener 4 from the front vertical grid bar 2a and to remove the telescopic extension 1 from the vertical grid bar 2a with a sideways movement.

[0067] In the present embodiment, the respective U-segments of the U-shaped sections 4a and 5a facing the inner rail 1a on the quick-release fasteners 4 and 5 serve as support sections 4b and 5b, respectively, which rest on the angled end sections 3a and 3b of the retaining bracket 3 when the telescopic extension 1 is mounted on the side rack, support the quick-release fasteners 4 and 5 thereon, and prevent the quick-release fasteners from sliding downwards on the vertical grid bars. Furthermore, the quick-release fasteners 4 and 5 have abutment sections 4c and 5c which, when the telescopic extension 1 is assembled, abut the sides of the vertical grid bars 2a and 2b facing the stationary inner rail 1a and stabilise the telescopic extension against tilting when assembled. Sections of the U-segments of the U-shaped sections 4a and 5a of the quick-release fasteners 4 and 5 also serve as abutment sections in the present embodiment.

[0068] A further essential element of the telescopic extension according to the invention consists of the safety lug 1e, which is formed in one piece with the movable outer rail 1b according to the invention. In the present embodiment, the safety lug 1e is formed as a lug bent up vertically at the end lying in the extension direction and from the C leg of the outer rail formed as a ball raceway, which is arranged in such a manner that it comes into contact with the front angled end portion 3a of the retaining bracket 3 in the insertion direction, when the moveably mounted outer rail 1b is moved into its insertion end position or when a force acts on the moveably mounted outer rail in its insertion end position in the insertion direction, and against the spring force of the spring element.

[0069] While the sliding switch 1k according to the invention serves to exert a force in the insertion direction on the stationary inner rail 1a for an intended disassembly of the telescopic extension 1 and to move it in the insertion direction against the spring force of the spring element in order to bring the U-shaped section 4a of the front quick-release fastener 4 out of engagement with the front vertical grid bar 2a, the safety lug 1e according to the invention blocks and prevents an unintentional displacement of the quick-release fasteners 4 and 5 and a disengagement of the telescopic extension 1 with the side rack 2, if, for example, a holder is pushed in up to the insertion end position of the outer rail 1b and further force is applied in the insertion direction, which is then transmitted to the inner rail.

[0070] In the present embodiment, the telescopic extension 1 according to the invention has a support plate 1d which is detachably attached to the rail back of the outer rail 1b, with a support surface 1f on its upper side for supporting a holder. As can be seen in the cross-sectional views of FIGS. 5 and 6, the support plate 1d is designed and fixed to the outer rail in such a manner that the support surface 1f is arranged above the upper sides of the rail elements of the telescopic extension 1 and above the retaining bracket 3.

[0071] In the present embodiment, the surface of the support plate 1d is provided with a transparent, temperature-resistant coating that protects the surface from discolouration, as often occurs on unprotected steel or stainless steel surfaces due to the high temperatures applied during pyrolysis in baking ovens.

[0072] The support plate is attached to the rail back of the movable outer rail 1b by means of a bayonet or hook connection. For this purpose, two upward-directed hook-shaped lugs 1i are arranged in the rail back of the outer rail 1b, which are formed in one piece with the outer rail 1b by punching out the contours of the lugs in the steel sheet of the rail back during the manufacture of the outer rail and then bending the sheet to form the hook-shaped lugs.

[0073] On the side of the support plate 1d facing the rail back of the outer rail 1b, corresponding recesses 1j are arranged for engagement with the hook-shaped lugs 1i, which are hooked into the hook-shaped lugs 1i from above. In the embodiment shown in FIGS. 1 to 6, the recesses 1j, as shown in FIG. 4, are formed by welded-on metal sheets with a hat profile.

[0074] In an alternative embodiment of the support plate 1d shown in FIG. 7, the recesses 1j are formed in one piece with the support plate 1d and are formed in a section of the support plate 1d that is folded over along the lower edge of the support plate 1d in the direction of the outer rail.

[0075] Both embodiments of the support plates 1d shown in the figures have an end stop 1g at the end located in the insertion direction, which forms a stop against displacement of a holder placed on the support plate 1d in the insertion direction beyond the end of the support plate 1d located in the insertion direction. The end stop 1g is formed in one piece with the support plate 1d and formed as a lug bent out of the steel sheet of the support plate perpendicular to the insertion direction.

[0076] Furthermore, both embodiments of the support plate 1d shown in the figures have an end cap 1h at the end located in the extension direction, which is formed in one piece with the support plate 1d as a lug bent out of the steel sheet of the support plate in the direction of the movable outer rail and, in the assembled state, at least partially covers the end of the movable outer rail 1b located in the extension direction. The end cap 1h forms a stop in the extension direction for a mounted holder in order to prevent the holder from being pulled down from the telescopic extension 1 when the outer rail 1b has reached its extension end position during extension from the oven.

[0077] For the purposes of original disclosure, it should be noted that all of the features as they become apparent to a skilled person based on the present description, the drawings, and the claims, even if they have been specifically described only in connection with specific other features, can be combined both individually and in any combination with other features or groups of features disclosed here, insofar as this has not been expressly excluded or technical circumstances make such combinations impossible or pointless. A comprehensive, explicit presentation of all conceivable combinations of features is omitted here solely for the sake of the brevity and legibility of the description.

[0078] Although the invention has been presented and described in detail in the drawings and the foregoing description, this representation and description is made merely by way of example and is not intended to limit the scope of protection as defined by the claims. The invention is not limited to the embodiments shown.

[0079] Modifications of the disclosed embodiments will be obvious to the skilled person based on the drawings, the description, and the appended claims. In the claims, the word comprise does not exclude other elements or steps, and the indefinite article a or one does not exclude a plurality. The mere fact that certain features are claimed in different claims does not preclude their combination. The reference signs in the claims are not intended to limit the scope of protection.

LIST OF REFERENCE NUMBERS

[0080] 1 Telescopic extension [0081] 1a Inner rail [0082] 1b Outer rail [0083] 1c Middle rail [0084] 1d Support plate [0085] 1e Safety lug [0086] 1f Support surface of the support plate [0087] 1g End stop [0088] 1h End cap [0089] 1i Hook-shaped lugs [0090] 1j Recesses [0091] 1k Sliding switch [0092] 2 Side rack [0093] 2a Front vertical grid bar [0094] 2b Rear vertical grid bar [0095] 3 Retaining bracket [0096] 3a Front angled end portion of the retaining bracket [0097] 3b Rear angled end portion of the retaining bracket [0098] 3c Horizontal portion of the retaining bracket [0099] 4 Front quick-release fastener [0100] 4a U-shaped section [0101] 4b Support section [0102] 4c Abutment section [0103] 5 Rear quick-release fastener [0104] 5a U-shaped section [0105] 5b Support section [0106] 5c Abutment section