[0001] The present invention relates to a door for closing a cooking cavity of an oven,
especially of a household oven, with a first unit and a second unit.
[0002] For ovens, several types of doors for closing cooking cavities compromising a first
unit and a second unit are known in the state of the art. However, it is also desired
to prevent that the outer surface of the door heats up too much when the oven is in
use. This improves the comfort when cooking and the decreases the risk of getting
burned, especially for children. Furthermore, it is important that the door can be
produced, maintained and cleaned in an easy way.
[0003] DE 84 13 224 U1 describes an oven door, with a front cover which comprises feather elements directed
towards the inner door part to connect the front part with the inner part. The inner
part is made from sheet metal in one piece. This piece contains the inner window and
the door frame. The frame part of the inner part comprises openings in order to connect
the inner part with feather elements of the front part. The feather elements snap
into these openings for connection, and can be released for disassembling the door
parts. To produce these complex door parts, however, is very time consuming. Further,
sheet metal does not meet the durability requirements of a modern oven door. Also,
the outer surface of the door is not cooled or isolated.
[0004] DE 101 63 150 shows an oven door where the plates are connected through corner elements and horizontal
and vertical elements. All these elements constitute a door frame in an assembled
condition of the door. One disadvantage of this oven door is that there is no ventilation
of the interior space possible. The exactly aligned horizontal and vertical elements
complicate the assembling of the door. Finally, these pieces are expensive to produce.
[0005] In
DE 199 06 747 A1, an oven door is shown whose inner plate can be removed. The door has an upper and
lower horizontal element. Between the upper horizontal element and an upper end element
a pivotal point for turning the inner plate is arranged. The inner plate is connected
with the lower horizontal element which snaps in a connection part of the feather
element to fix the door plates. This enables the inner plate to be fold out, but the
inner plate cannot be taken out. For this design, a lot of different parts are necessary,
which are expensive and time consuming in their manufacture. Finally, for this door
no ventilation is provided.
[0006] DE 696 09 223 T2 shows an oven door with a detachable device. Side bars build a frame on the inner
plate. On these bars and the frame of the outside part connection elements are arranged,
so that these two devices can be snapped together. Guiding elements on both devices
provide the correct assembling. This connection is detachable. The main disadvantage
is that the devices are connected only though single points. So this connection is
not very durable. There is no possibility of inserting an additional inside plate.
[0007] Therefore it is an object of the invention to provide a door for closing a cooking
cavity of an oven, especially a household oven which offers ventilation for cooling
the door and which is easy to assemble, to repair and to clean.
[0008] The solution of this object according to the invention is achieved by a door according
to claim 1 and an oven according to claim 16. Advantageous embodiments are described
particularly in the dependant claims.
[0009] According to claim 1, a door is provided for closing a cooking cavity of an oven,
especially a household oven, with a first unit and a second unit
characterized in that one unit is guided by at least one detachable or releasable connection means, in
particular snapping and/or plugging and/or sliding means, in the other unit, and at
least one unit is provided with at least one opening for ventilation, which is connected
in a closed position of the door to an air suction area of the oven.
[0010] This makes it possible to use the air which is sucked into the oven for cooling also
for cooling the outer surface of the door. In other words, the ambient air is cooling
the outer surface of the door at first and then cooling the surrounding area of the
cooking cavity. The detachable or releasable connection means facilitate production,
maintenance as well as cleaning of the door.
[0011] Preferably, the first unit is an outer unit and contains a front plate, two vertical
elements arranged in parallel on the front plate and at least one inside plate arranged
between the vertical elements. This enables a compact and stable structure of the
front plate and the at least one inside plate which is, in addition, mountable in
an easy way.
[0012] Preferably, the second unit is an inner unit and contains an inner plate and a frame,
which extends over the side areas and the upper transversal area of the inner plate.
By this, the structure which is carrying the at least one inside plate can be covered
so that dirt can be reduced. If dirt intrudes nevertheless, it can be easily removed
after detaching or releasing the connection of the two units.
[0013] Preferably, the at least one opening for ventilation is arranged close to the upper
transversal area of the inner plate. This makes it possible to ventilate the plates
up to their upper end.
[0014] Preferably, the at least one opening for ventilation is located in the same plane
or at the same level as the inner plate, that means they are directed towards the
oven when the door is locked. The air suction area of the oven, which is the area
where the at least one ventilation opening normally leads to, can advantageously be
arranged over the cooking cavity. As an alternative, it is possible to arrange the
at least one opening for ventilation in the inner plate. This is possible particularly
if the inner plate covers the cooking cavity and the air suction area.
[0015] According to a preferred embodiment, the at least one opening for ventilation extends
in a horizontal direction over about the width of the inside plates. That provides
a maximum cross sectional area of the air flow, and improves the cooling of the oven
door. Alternatively, two or more openings for ventilation can be arranged side by
side so that the air flow can disperse over the whole cross sectional area advantageously.
[0016] Preferably, the at least one opening for ventilation is arranged between the upper
transversal area of the frame and the inner plate. It is possible that this is provided
through a distance or gap between these two parts.
[0017] According to a preferred embodiment, the at least one opening for ventilation is
arranged in a separate ventilation bar, which is preferably placed between the transversal
frame part and the inner plate. The ventilation bar preferably extends also into the
inside of the door, which stabilises the complete door construction. Furthermore,
the air flow can advantageously lead from the door inside to the air suction area
of the oven through the ventilation bar without any turbulences.
[0018] Preferably, the at least one opening for ventilation is arranged in an extension
of the frame which adjoins the inner plate at the level of the cooking cavity. In
this area of the frame part, the openings for ventilation can be inserted.
[0019] The interior area of the door has preferably at least one opening or opens towards
the bottom, so that ambient air can be sucked in from the surrounding environment
outside the oven.
[0020] Preferably, the ventilation of the door is provided by an air flow, which gets sucked
in from the bottom, is lead through the inside of the door and directed through the
at least one opening for ventilation to the air suction area of the oven. In a preferred
embodiment, the air flow cross section stays at least approximately the same inside
the door. Preferably, the vertical connection elements are arranged in the side areas
of the unit, so that the air flow has no barriers to bypass and can be easily guided
without turbulences from the bottom of the door to the upper openings for ventilation.
[0021] Preferably, the second unit is mounted on the first unit.
[0022] Preferably, the frame is guided by at least one connection means in the vertical
elements of the first unit. Preferably, the connection of the two units is realized
with at least one bayonet connection. To connect the two units, preferably one unit
is put on the other at first and then the two units are slided against each other,
so that shaped connection means of one unit can reach into corresponding recesses,
the bayonet openings or recesses, of the other unit. Preferably, several connection
means are arranged on each side of the units which can be connected at the same time
so that the two units can be connected easily one the one hand but also establish
a stable connection on the other hand.
[0023] Preferably, the shaped connection means snap into a final position, which is the
position when both units form the assembled door, in corresponding gaps to establish
and fix the connection of the two units.
[0024] This connection can be unfixed by opening the snapping connection and sliding one
unit out of the bayonet guides. So the door can be disjoined in its main parts, the
two door units, for cleaning or maintenance.
[0025] Preferably, the door frame is made at least essentially of metal. In a preferred
embodiment, the door frame is made at least essentially of steel. This has the advantage
that the frame can be cleaned particularly easily and the connection of the two units
is very durable. It is also possible to have only parts of the frame made of metal.
However, this invention is not limited to the use of metal for the frame, instead
of metal any other suitable material can be taken. The plates are usually made of
glass or other transparent material.
[0026] Preferably, the first unit comprises at least one snapping device, particularly a
snapping hook,
where the second unit comprises at least one opening, particularly with a rectangular
shape,
where the snapping device is releasably pushable into the opening to connect the first
unit and the second unit. This enables an easy and stable fixing and a simple releasing
of the first and the second unit with each other.
[0027] According to claim 16, the invention comprises an oven with a cooking cavity and
a door for closing the cooking cavity according to one of the claims 1 to 15.
[0028] The invention will be described in further detail with reference to the drawings
in which
- FIG 1
- shows the assembled door,
- FIG 2
- shows the outer unit of the door,
- FIG 3
- shows the inner unit of the door,
- FIG 4
- shows a back view of the assembled door and
- FIG 5
- shows the cross-sectional view of a side view,
- FIG 6
- shows another embodiment of the invention in a released position,
- FIG 7
- shows the door according to FIG 6 in fixed position,
- FIG 8
- shows a detail of FIG 6,
- FIG 9
- shows the surrounding area of the upper end of the oven door and
- FIG 10
- shows the door assembled with the oven.
[0029] FIG 1 and FIG 4 show a completely assembled door 1 which consists of a first unit
2 used as an outer unit and a second unit 3 used as an inner unit.
[0030] The outer unit 2 comprises a front plate 21 of the door 1 which is visible from the
outside. On the upper outer surface of the front plate 21, a handle 28 is arranged.
[0031] The inner unit 3 is arranged on the inner surface of the front plate 21. The inner
unit 3 comprises a frame 32, which extends over the outer side areas 32A and 32B,
respectively, and the upper transversal area 32C of the inner unit 3. In the lower
transversal area 32D of the outer unit 3, no frame is provided. Consequently, the
bottom of the door 1, which is not shown in FIG 1, stays open for ventilation purposes.
[0032] Underneath the upper transversal area 32C of the inner unit 3, a ventilation bar
34 with openings 33A, 33B for ventilation is arranged. For durability, the ventilation
bar 34 has a thin stabilisation bar 35 in the middle between the openings 33A and
33B for ventilation. So the ventilation is spread over two openings for ventilation
33A and 33B. The inner
[0033] plate 31 of the door 1 closes or seals the cooking cavity. The openings for ventilation
33A and 33B adjoin directly to an air suction area of the oven, which is placed over
the cooking cavity. The air suction area of the oven is not shown in FIG 1.
[0034] FIG 2 shows the outer unit 2. The two parallel vertical elements 22A and 22B are
fixed, preferably glued or screwed, on the back-sided side areas of the front plate
21. Between the vertical elements 22A and 22B, an inside plate 23 is arranged which
is hold parallel to the front plate 21 by the vertical elements 22A and 22B. On their
outwardly directed sides, the vertical elements 22A and 22B have insertion areas 41A
and 41B in the upper area, insertion areas 51A and 51B in the middle area and insertion
areas 61A and 61B in the lower area.
[0035] Adjacent to the front plate 21, the insertion areas 41B, 51B and 61B comprise elongated
supports 42B, 52B and 62B, respectively. Underneath the insertion areas 41B, 51B and
61B, also adjacent to the front plate 21, elongated openings 43B, 53B and 63B are
arranged. In the lower area of the openings 43B and 53B, recesses 44B and 54B, respectively,
are arranged.
[0036] The insertion area 41B, the support 42B, the opening 43B and the recess 44B on the
outward side of the vertical element 22B form a bayonet or snapping connection to
fix the inner unit 3. Also, the insertion area 51B, the support 52B, the opening 53B
and the recess 54B on the outward side of the vertical element 22B form another bayonet
or snapping connection to fix the inner unit 3. The insertion area 61B, the support
62B and the opening 63B on the outward side of the vertical element 22B form a third
bayonet or snapping connection to fix the inner unit 3.
[0037] Correspondingly, the insertion area 41A, the support 42A, the opening 43A and the
recess 44A on the outward side of the vertical element 22A form a bayonet or snapping
connection to fix the inner unit 3. The insertion area 51A, the support 52A, the opening
53B and the recess 54A on the outward side of the vertical element 22A form another
bayonet or snapping connection to fix the inner unit 3. Finally, the insertion area
61A, the support 62A, the opening 63A and the recess 64A on the outward side of the
vertical element 22A form a bayonet or snapping connection to fix the inner unit 3.
[0038] FIG 3 shows the inner unit 3. The frame 32 extends over the side areas 32A and 32B
of the inner plate 31 of the inner unit 3 and the upper transversal area 32C over
the ventilation bar 34. The inner plate 31 closes the cooking cavity, not shown here.
The ventilation bar 34 adjoins to an air suction area, not shown here, which is arranged
over the front of the cooking cavity. The connection means for connecting the inner
unit 3 with the outer unit 2 which are not shown in FIG 3 are arranged on the interior
side of the side areas 32A and 32B of the frame.
[0039] To connect the two units, the connection means of the frame 32 of the inner unit
3, here not shown, are positioned over the inserting areas 41A, 51A, 61A, 41B, 51B
and 61B of the outer unit 2 and then concurrently inserted into these areas, orthogonally
to the plane of the inner plate 31 and following direction D1.
[0040] Afterwards, by sliding the connection means of frame 32 downwardly in parallel to
the plane of the inner plate 31, following direction D2, into the openings 43A, 53A,
63A, 43B, 53B and 63B of the vertical elements 22A and 22B, the units 2 and 3 are
connected. For fixing this connection, the connecting elements of the inner unit 3
snap into a final end position into the recesses 54A, 54B of the vertical elements
22A and 22B of the outer unit 2.
[0041] FIG 5 shows a cross sectional view from a side view of the oven door 1. The ventilation
bar 34 extends under the traversal area 32C of frame 32 into the interior 27 of the
first unit 2 between front plate 21 and inside plate 23. The interior 27 of the first
unit 2 is open at the bottom 9. By this, ambient air flow A is sucked through the
bottom 27 of the door 1 into the interior 27 of the first unit 2 to cool the front
plate 21. The air flow A is guided between or through the space between the front
plate 21 and the inside plate 23. The air flow A extends from the bottom to the ventilation
bar at the top and finally in the air suction area of the oven.
[0042] By repeatedly assembling and disassembling of the first unit 2 and the second unit
3, the cross-section of the air flow A is not noteworthy affected, as the front plate
21 and the interior plate 23 stay in their positions relative to each other. This
makes it possible to optimize and preserve the form of the cross section over a long
time which is helpful for maintaining the air flow A in the desired way.
[0043] The plates 21, 23, 31 are usually made of glass or other transparent material.
[0044] Figures 6 to 8 show another embodiment of the invention where the inner unit 3' is
fixed to the outer unit 2' by two snapping hooks 72B' and, not shown, 72A'. The snapping
hook 72B' is sprayed onto the base area of the vertical, not shown element 22B'. It
comprises a support plate 71B' which works as a base plate and which comprises an
edge 76B' at its outer end. A carrying element 75B' is arranged on the support plate
71B' where the carrying element 75B', at its outer end, forms the snapping hook 72B'.
The snapping hook 72B' is bent downwards at a bending 74B'.
[0045] On the other hand, the inner unit 3' comprises at the bottom of its side area 32B'
a notch 73B'. The notch 73B' is formed as a rectangular opening.
[0046] When pushing the inner unit 3' onto the outer unit 2', the snapping 72B' is pushed
into the notch 73B' and, by this, fixes the inner unit 3' and the outer unit 2' with
each other. The fixed state is shown in FIG 7, whereas FIG 6 and FIG 8 show the released
state. By pushing the snapping hooks 72B' and 72A' with the fingers, the connection
can be released again.
[0047] Figures 9 and 10 show the door assembled with the oven. For this, FIG 10 shows the
muffle 80, the door 1 in front of the muffle and the fan 81 which is arranged above
the muffle. Above the fan 81, an air suction channel 82 which constitutes the air
suction area is arranged and above the air suction channel 82, an air blowing channel
83 is arranged. The fan 81, when operated, sucks the air out of the door 1 along the
air suction channel 82, where it also sucks hot air out of the muffle 80 through the
opening 84 above the muffle 80. After passing the fan 81, the air is blown through
the blowing channel 83 and is blown out of the oven over the door 1. Over the door,
a top plate 182 is arranged.
Reference Signs
[0048]
- 1, 1'
- door
- 2, 2'
- first unit
- 21
- front plate
- 22A, 22B
- vertical elements
- 23
- interior plate
- 27
- interior
- 28, 28'
- handle
- 29
- bottom
- 3
- second unit
- 31
- inner plate
- 32
- frame
- 32A, 32B, 32B'
- side areas
- 32C
- transversal area
- 33A, 33B
- openings for ventilation
- 34
- ventilation bar
- 35
- stabilisation bar
- 41A, 41B, 51B, 61B
- insertion areas
- 42B, 52B, 62B
- supports
- 43B,53B, 63B
- openings
- 54B
- recess
- 71A',71B'
- support plate
- 72B'
- snapping hook
- 73B'
- notch
- 74B'
- bending
- 75B'
- carrying element
- 76B'
- edge
- 80
- muffle
- 81
- fan
- 82
- air suction channel
- 83
- air blowing channel
- 84
- muffle opening
- 182
- top plate
- A
- air flow
- D1, D2
- assembling directions
1. Door (1, 1') for closing a cooking cavity of an oven, especially of a household oven,
with a first unit (2, 2') and a second unit (3, 3') characterized in that one unit (2, 3; 2', 3') is guided by at least one detachable or releasable connection
means, in particular snapping and/or plugging and/or sliding means, in the other unit
(2, 3; 2', 3'), and at least one unit (2, 3; 2', 3') is provided with at least one
opening for ventilation (33A, 33B, 33A', 33B'), which is connected in a closed position
of the door (1, 1') to an air suction area of the oven.
2. Door (1) according to claim 1, characterized in that the first unit (2) is an outer unit (2) and contains a front plate (21), two vertical
elements (22A, 22B) arranged on the front plate (21) and at least one inside plate
(23) arranged between the vertical elements (22A, 22B), where especially an air flow
(A) is guided between the front plate (21) and the inside plate (23).
3. Door (1) according to claim 1 or 2, characterized in that the second unit (3) is an inner unit (3) and contains an inner plate (31) and a frame
(32), which extends over the side areas and the upper transversal area of the inner
plate (32).
4. Door (1) according to claim 3, characterized in that the at least one opening for ventilation (33A, 33B) is arranged close to the upper
transversal area of the inner plate (31).
5. Door (1) according to claim 4, where the at least one opening for ventilation (33A,
33B) is located in the same plane or at the same level as the inner plate (31).
6. Door (1) according to claim 4 or 5, characterized in that the at least one opening for ventilation (33A, 33B) has about the same width as the
inside plate (23).
7. Door (1) according to one of claims 4, 5 or 6, characterized in that the at least one opening for ventilation (33A, 33B) is arranged between the upper
transversal area of the frame (32) and the inner plate (31).
8. Door (1) according to claim 7, characterized in that the at least one opening for ventilation (33A, 33B) is arranged in an separate ventilation
bar (34).
9. Door (1) according to claim 7 or 8, characterized in that the at least one opening for ventilation (33A, 33B) is arranged in an extension of
the frame (32) which adjoins the inner plate (31) at the level of the cooking cavity.
10. Door (1) according to any of the preceding claims, characterized in that the interior of the door (1) has at least one opening or opens towards the bottom,
for sucking in ambient air.
11. Door (1) according to claim 2 or to any of the preceding claims, characterized in that the ventilation of the door (1) is provided by an air flow (A), which gets sucked
in from the bottom, is lead through the inside of the door (1), especially through
the space between the front plate (21) and the inside plate (23), and directed through
at the least one opening for ventilation (33A, 33B) to the air suction area of the
oven.
12. Door(1) according to any of the preceding claims, characterized in that the second unit (3) is mounted on the first unit (2).
13. Door (1) according to any of the preceding claims, characterized in that the frame (32) is guided by at least one connection means in the vertical elements
(22A, 22B) of the first unit (2).
14. Door (1) according to any of the preceding claims, characterized in that the frame (32) is made at least partly of metal, especially of steel.
15. Door (1') according to any of the preceding claims,
characterized in that
a) the first unit (2') comprises at least one snapping device (72B'), particularly
a snapping hook,
b) where the second unit (3') comprises at least one opening (73B'), particularly
with a rectangular shape,
c) where the snapping device (72B') is releasably pushable into the opening (73B')
to connect the first unit (2') and the second unit (3').
16. Oven with a cooking cavity and a door for closing the cooking cavity according to
one of the claims 1 to 15.