U.S. patent application number 11/077136 was filed with the patent office on 2005-08-11 for rail or telescopic extension.
This patent application is currently assigned to BSH Bosch und Siemens Hausgerate GmbH. Invention is credited to Kuttalek, Edmund.
Application Number | 20050174022 11/077136 |
Document ID | / |
Family ID | 31724547 |
Filed Date | 2005-08-11 |
United States Patent
Application |
20050174022 |
Kind Code |
A1 |
Kuttalek, Edmund |
August 11, 2005 |
Rail or telescopic extension
Abstract
A horizontal or vertical rail or telescopic extension of a
cupboard element, a baking shelf or an oven door of a cooking or
similar device. The extensions including at least one outer rail of
bent sheet metal and a sliding rail of bent sheet metal, which
partially surrounds the outer rail and can be displaced along the
outer rail by an anti-friction bearing. The rail extension
including an outer attachment rail which is connected to and
reinforces the outer rail and/or a further attachment rail that is
connected to and reinforces the sliding rail. The telescopic
extension includes two interconnected rail extensions.
Inventors: |
Kuttalek, Edmund; (Grassau,
DE) |
Correspondence
Address: |
JOHN T. WINBURN
100 BOSCH BOULEVARD
NEW BERN
NC
28562
US
|
Assignee: |
BSH Bosch und Siemens Hausgerate
GmbH
Munich
DE
|
Family ID: |
31724547 |
Appl. No.: |
11/077136 |
Filed: |
March 3, 2005 |
Current U.S.
Class: |
312/410 |
Current CPC
Class: |
A47B 2210/0032 20130101;
F24C 15/027 20130101; A47B 2210/0059 20130101; A47B 88/487
20170101; F24C 15/168 20130101; A47B 88/493 20170101 |
Class at
Publication: |
312/410 |
International
Class: |
A47B 081/00 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 9, 2002 |
DE |
10241683.4 |
Sep 9, 2003 |
WO |
PCT/EP03/10012 |
Claims
1-16. (canceled)
17. A rail extension for the horizontal or vertical extension of an
element such as a cupboard element, a baking shelf or an oven door
of a cooking appliance or similar device, the extension comprising:
at least one outer rail of bent sheet metal; a sliding rail of bent
sheet metal that partially surrounds said outer rail; an
anti-friction bearing by which said sliding rail can be displace
along said outer rail; and an outer attachment rail connected to
and reinforcing at least one of said outer rail or an attachment
rail connected to said sliding rail.
18. The rail extension according to claim 17, including said outer
rail and said sliding rail each having a pair of legs and said
anti-friction bearing includes at least one rolling element which
slides between one of said legs of each pair of legs of said outer
rail and said sliding rail for mutual guidance of said outer rail
and said sliding rail.
19. The rail extension according to claim 18, including said
rolling element formed by a plurality of cage-mounted balls, roll
or rollers.
20. The rail extension according to claim 17, including said outer
rail has a U-shaped profile.
21. The rail extension according to claim 17, including said outer
attachment rail has a U-shaped profile.
22. The rail extension according to claim 17, including said outer
rail is connected to said outer attachment rail by at least one of
welding, riveting, screwing or gluing.
23. The rail extension according to claim 17, including said outer
rail is formed with a closed hollow profile.
24. The rail extension according to claim 23, including said outer
rail is formed with a D-shaped profile.
25. The rail extension according to claim 17, including said
sliding rail and said attachment rail are formed with a U-shaped
profile.
26. The rail extension according to claim 17, including said
sliding rail is connected to said attachment rail by at least one
of welding, riveting, screwing or gluing.
27. The rail extension according to claim 17, including the
horizontal or vertical extension element has a pair of longitudinal
sides and each of said sides includes at least one rail extension
connected thereto to form a partial extension.
28. A telescopic extension for the horizontal or vertical extension
of an element such as a cupboard element, a baking shelf or an oven
door of a cooking appliance or similar device, the telescopic
extension comprising: a pair of interconnected rail extensions;
each of said rail extensions including; at least one outer rail of
bent sheet metal; a sliding rail of bent sheet metal that partially
surrounds said outer rail; an anti-friction bearing by which said
sliding rail can be displace along said outer rail; an outer
attachment rail connected to and reinforcing at least one of said
outer rail or an attachment rail connected to said sliding rail;
each said attachment rail having a flat base section; and said flat
base sections of said pair of attachment rails joined together to
form said interconnection of said rail extensions.
29. The telescopic extension according to claim 28, including each
of said attachment rails are formed with a U-shaped profile.
30. The telescopic extension according to claim 28, including said
attachment rails are joined together by at least one of welding,
riveting, screwing or gluing.
31. The telescopic extension according to claim 28, including the
horizontal or vertical extension element has a pair of longitudinal
sides and each of said sides includes at least one telescopic
extension connected thereto.
32. The telescopic extension according to claim 31, including
forming a full extension of said extension element.
Description
[0001] The invention relates to a rail extension or a telescopic
extension for the horizontal or vertical extension of an extendable
element, especially a baking shelf of a cooker.
[0002] In known ovens it is usually possible to arrange the food on
grids or sheets at various heights between underheat and overheat
for which purpose guide rails for placing the grids or sheets are
formed on the side walls of the cooking compartment. In order to
achieve better accessibility and handling of the sheets or grids,
extendable frames with a baking shelf are known which are connected
to the cooking compartment by means of lateral guide rails or
telescopic extensions and make it possible to displace the baking
shelf horizontally together with the food.
[0003] Generic arrangements of baking ovens or cookers with rail or
telescopic extensions are known, for example, from DE 198 17 499 C1
or from DE 100 51 153 A1. In addition to cookers with front-opening
doors, those with downward-opening doors are also known in which
the door can either be configured as downward-hinged or
downward-extensible. Thus, for example, a cooker is described in DE
100 59 650 C1 in which a door for closing the cooking compartment
is constructed as a housing base which closes the open underside of
the oven housing and can be lowered vertically by means of guide
elements.
[0004] Fairly long guide elements, rail extensions or telescopic
extensions which can additionally be subjected to a bending load by
relatively heavy baking shelves, must be designed as sufficiently
stable and as a result are usually relatively voluminous.
Telescopic extensions with rails made of bent sheet metal in some
cases do not have the necessary stability and torsional resistance.
An increase in the sheet metal thickness of the rails so that these
can better withstand the loads which occur, would require new
bending tools and larger presses to manufacture the rails. With
increasing sheet metal thickness, the bending radii necessarily
also become larger whereby the geometry of the rails varies
accordingly. In some cases, therefore telescopic extensions with
rails made of cold-drawn solid material are used which can absorb a
higher load. However, such telescopic extensions have a relatively
high weight and in addition, are expensive to manufacture.
[0005] It is the object of the invention to improve a known rail
extension or telescopic extension with regard to its stability.
[0006] This object is achieved with a rail or telescopic extension
according to the preamble of claim 1 according to the invention by
additionally inserted attachment rails. The attachment rails bring
about a significant stiffening for the same external dimensions
whereby the extension can bear higher loads without any additional
bending or distortion occurring. The U-shaped attachment rails are
inserted inside or outside already existing sheet metal profiles of
outer or sliding rails which can be displaced with respect to one
another and are connected thereto. The external dimensions of the
rail or telescopic extensions remain the same but the stability of
the rails is significantly increased. The attachment rails can be
welded, riveted, screwed or glued to the base rails. The connection
points can be executed as punctual (e.g. welding or gluing points)
or linear. An increased torsional resistance can be achieved by the
base and also the legs of the interconnected rails each having
joining points. The rails typically consist of bent steel sheet.
The inner attachment rail can especially be constructed as a
U-profile or as a hollow profile or as a D-profile or similar.
[0007] A telescopic extension is formed from at least two rail
extensions of the same type which are joined together by the backs
of their attachment rails.
[0008] These reinforcements are equally suitable for rail
extensions (so-called partial extension) and for multi-part
telescopic extensions (so-called full extension) which make it
possible to achieve a horizontal or vertical displacement of an
extendable element. Either a centrally attached rail or telescopic
extension can be provided for guidance of an extendable element.
Alternatively, two or more rail or telescopic extensions can be
provided which are preferably attached to both longitudinal sides
of the extendable element.
[0009] The invention is explained in detail in the following with
reference to an exemplary embodiment with reference to the appended
drawings. In the figures:
[0010] FIG. 1 is a cooker with a horizontal rail extension
according to the invention,
[0011] FIGS. 2 and 3 each show a cooker with a vertical rail
extension,
[0012] FIGS. 4 and 5 each show a schematic detailed view of two
alternative variants of the rail extension according to the
invention,
[0013] FIG. 6 shows a schematic detailed view of a telescopic
extension and
[0014] FIG. 7 is a schematic diagram of an extendable element of a
telescopic extension.
[0015] FIG. 1 shows a cooker 2 in conventional design with a door
23 at the front in the form of a front flap which can be hinged
downwards. Provided on the side walls of a cooking compartment 22
are rail extensions 4 which make it possible to horizontally extend
an extendable element 26, preferably a baking shelf 28 or similar.
In the view shown the rail extensions 4 are each constructed as
so-called partial extensions in which a short section of the baking
shelf 28 stays inside the cooking compartment 22. A longer
extension path of the baking shelf can be achieved with a so-called
full extension which has telescopic extensions in each case instead
of simply extendable rail extensions. This variant of an extension
is described in detail with reference to FIGS. 6 and 7.
[0016] FIGS. 2 and 3 each show an alternative design of a cooker 2
which has a door 23 on an underside 24 of an oven housing 21 which
can be displaced vertically downwards and thereby makes it possible
to have access to a shelf 28 for food (see FIG. 3). Instead of the
rail extensions 4 shown in FIGS. 2 and 3, the downward-extendable
element 26 can also be constructed as extendable by means of a
telescopic extension, as is described in detail in FIGS. 6 and
7.
[0017] FIG. 4 shows a schematic detailed view of a first variant of
a rail extension 4 according to the invention, viewed from above. A
U-shaped outer rail 41 is affixed to a side wall or other fixing
point of an oven housing 21. The outer rail 41 is connected by a
base 42 of its U profile to the oven housing 21 by means of a
screwed, glued, riveted and/or welded joint. The legs 43 of the
U-profile of the outer rail 41 are configured as running surfaces
for rolling elements or balls 48 of an anti-friction bearing 47.
They therefore have a slightly outwardly curved contour. For
stiffening the outer rail 41 an attachment rail 49 is provided
inside its U-profile, whose legs 51 are connected to the insides of
the legs 43 of the outer rail 41 and whose base 50 is connected to
the base 42 of the outer rail 41. These connections can be
configured as welded, glued, riveted and/or screw connections as
desired. An elevated torsional resistance can be achieved by
providing a series of connecting points in the cross-section and
not only, for example on the base 42 of the outer rail 41 between
the base 50 of the outer attachment rail 49.
[0018] Whilst the rolling elements 48 of the anti-friction bearing
47 are supported internally on the legs 43 of the outer rail 41, on
the outside they guide a sliding rail 44 whose two legs 46 are each
slightly curved inwards and in this way provide for a fixing of the
balls 48 on their provided races. One base 45 of the sliding rail
44 is connected to a base 53 of an attachment rail 52 whose legs 54
abut against the legs 46 of the sliding rail or are connected to
this. These connections can also be configured as welded, glued,
riveted and/or screw connections. The attachment rail 52 provides
for a stiffening of the sliding rail 44 and prevents its distortion
during an extension of the rail extension 4. Likewise, the outer
attachment rail 49 provides for a stiffening and stabilisation of
the outer rail 41.
[0019] The balls or rolling elements 48 are preferably guided in a
cage 55 which ensures a uniform spacing of the balls from one
another. Depending on the desired usage, the anti-friction bearing
can have grease lubrication which is resistant to the temperatures
prevailing in the cooking compartment. If the cooker is operated
even temporarily in a pyrolysis mode, such grease lubrication is
unsuitable since it cannot withstand the typical pyrolysis
temperatures of around 500.degree. C. In this case, for example,
rolling elements and/or races made of ceramic or having a ceramic
coating can be used.
[0020] FIG. 5 shows a schematic detailed view of a second variant
of the rail extension 4 according to the invention. Affixed to a
side wall of the oven housing 21 is an outer rail 41 with a
D-shaped hollow profile. The outer rail 4 is connected by a back 56
of its D-profile to the oven housing 21 by means of a screwed,
glued, riveted and/or welded connection. The legs 43 of the
D-profile of the outer rail 41 are configured as in the first
variant as races for balls 48 of the anti-friction bearing 47 and
thus have a slightly concave profile.
[0021] The outer rail 41 is very rigid towards torsion and bending
as a result of its closed profile. The closed profile is achieved
by a base 50 which connects the legs 43, which in this variant
corresponds to the outer attachment rail 49 according to the first
variant.
[0022] The guidance of the extendable element 26 with the aid of
the roller-mounted sliding rail 44, which is reinforced by the
attachment rail 52, corresponds to the first variant which has
already been described with reference to FIG. 4. The reasoning put
forward there applies similarly here.
[0023] FIG. 6 shows a detailed view of a telescopic extension 6
which is substantially constructed of two interconnected rail
extensions 4 according to FIG. 4. In this case, two attachment
rails 52 are interconnected by the backs of their bases 53 so that
the sliding rails 44 can be displaced longitudinally over the left
portion of the telescopic extension 56 towards the oven housing 21
and the right portion of the telescopic extension 6 can be
displaced longitudinally with the extendable element 26 towards the
two sliding rails 44. The remaining structure corresponds to that
of the rail extension 4 according to FIG. 4. In the same manner, a
telescopic extension can be achieved with combined rail extensions
according to the second variant (FIG. 5). A combination of both
variants in a telescopic extension can also be meaningful.
[0024] FIG. 7 illustrates in a perspective schematic view an
extended telescope extension 6 in which the outer rail 41 is
affixed to the oven housing 21. The attachment rails 52 displaced
downwards with respect to the outer rail 41 in turn hold the outer
attachment rail 49 affixed thereto, to which the extendable element
26 is affixed. A support 28 of the extendable element 26, which
points towards the front at right angles, causes possible bending
of the rail or telescopic extension 6 under greater loading by a
correspondingly heavy baking shelf, which is largely prevented by
the outer attachment rails 49 or attachment rails 52 which are
additionally present. The two arrows shown indicate this
loading.
[0025] Basically, a single telescopic extension or rail extension
can be provided for the support and displaceability of a baking
shelf. Frequently, however, two parallel extensions are provided
which are arranged on both sides of the door and ensure its better
guidance.
Reference list
[0026] 2 cooker
[0027] 21 oven housing
[0028] 22 cooking compartment
[0029] 23 door
[0030] 24 underside
[0031] 25 front
[0032] 26 extendable element
[0033] 27 longitudinal side
[0034] 28 support/baking shelf
[0035] 4 rail extension
[0036] 41 outer rail
[0037] 42 base (outer rail)
[0038] 43 leg (outer rail)
[0039] 44 sliding rail
[0040] 45 base (sliding rail)
[0041] 46 leg (sliding rail)
[0042] 47 anti-friction bearing
[0043] 48 rolling element/ball
[0044] 49 outer attachment rail
[0045] 50 base (outer attachment rail)
[0046] 51 leg (outer attachment rail)
[0047] 52 attachment rail
[0048] 53 base (attachment rail)
[0049] 54 leg (attachment rail)
[0050] 55 cage
[0051] 56 back side
[0052] 6 telescopic extension
* * * * *