EP1340944B1 - Extractor hood and Process for replacing or placing filters - Google Patents

Abstract

The extraction hood (1) has a filter cartridge (3) detachably fixed to the hood housing (8) by a clip (6) installed on the cartridge for engaging in a slot (7) in the hood housing. The clip is constructed in hook form to create a hinge-type connection with the corresponding opening slot in the hood housing. The filter cartridge has a frame (4) upon which is installed the clip, and may be connected in one piece to the frame or manufactured as a separate part and connected to the frame by riveting and/or welding. An Independent claim is included for the changing or fitting of filters, whereby with fitting the cartridge the clip is first located in a correspondingly constructed opening in the hood housing.

Description

The present invention relates to a fume hood for extracting fumes and a method for changing or inserting filters in such a fume hood. In the context of the present invention, the term "haze" is understood to mean any form of gaseous carrier material which is contaminated with solid or liquid substances of small particle size.

Their main area of use is hoods in kitchens, where they are used to extract and / or clean cooking fumes produced at a cooking place. Hoods are now part of every modern kitchen, with the use of hoods is not limited to the field of kitchen technology. Even in clean rooms, on industrial jobs, such. B. on machine tools with coolant, but also in smoking corners hoods are used in each case adapted. In all the aforementioned cases forms a respective room air, the gaseous carrier, which is burdened for example by dust, smoke, water, grease, oil, etc.

In the field of kitchen technology, as the most widespread use of fume hoods, very high demands are placed on such devices for food or health reasons, including aesthetic considerations for suction of cooking fumes and safe capture and retention of the substances contained in the cooking fumes , For the ingredients of fumes exemplified above, the term "vapor" is used in the field of kitchen technology as a collective term.

Exhaust hoods include in a basic form a fan, a hood which tapers in the withdrawal direction and a grease filter covering the fan inlet. An improved extraction of cooking fumes caused the use of increasingly larger grease filters. In modern extractor hoods, combined or cascaded grease filters are also used. For easier handling, but also for mechanical stabilization, Grease filters are usually designed in the form of filter cassettes. Such filter cassettes are usually fixed in the range of Gebläungsananges to a housing of the hood. The filter cassettes are also designed for removal by a user for maintenance or cleaning purposes. In the course of this change work, the problem arises that the grease filter or the entire filter cartridge to be secured during removal and also when reinstalling the hood housing for protection of persons and material against accidental drops. Filter cartridges modern cooker hoods have due to their size and the filter technology used in each case a relatively high weight on. Especially with design food or design hoods, filter cartridges can cause damage and / or injury when removed for cleaning by the user due to their weight and shape when dropped. Since in this regard manually operated fittings have proven to be inadequate, folding handles have been arranged in the range of a filter cartridge in known extractor hoods. However, such additional elements are very disturbing when adapted to design requirements or other requirements with respect to an outer housing dimension and housing design.

Alternatively, safety measures have been proposed in the form of safety chains, which are provided, for example, in the region of slide seals on a user-facing sides of the filter cartridge. Even in the simplified and improved form of a knot strip or a flexible holding element with end-side thickening for hanging and unhooking on a housing side provided approximately keyhole-shaped recess, this solution proves to be an additional expense at least in manufacturing. The securing element is to be attached as a separate part in plastic or metal design to a frame of the filter cartridge, wherein at least one adapted recess for receiving a free and thickened executed end portion of the securing element is provided on the housing of the hood.

Furthermore, from the US 6,284,011 B1 a take-off device is known in which a filter device is introduced at the top of a housing. The filter device is in this case optionally connected via a rotatably mounted in the opening of the housing holding rail or provided on the filter device hooks with the housing. Subsequently, the filter cartridge is moved in the opening by actuation of at least one elastic element, for example a spring, such that lugs provided on the filter cartridge engage with recesses at the opening edge.

Other typical representatives of the prior art represent the patents EP-A-1 111 312 and US-A-4,189,990 ,

It is the object of the present invention to provide a fume hood in which safety devices against falling down of a filter cartridge in the course of a change process with the aim of simplifying the production and handling are developed.

This object is solved by the features of claim 1. The subject of the independent method claim according to claim 9 represents a solution to this problem. Advantageous developments are the subject of the respective subclaims.

An extractor hood according to the invention is characterized accordingly in that it comprises a filter cartridge which is formed after a first fixing in the form of hanging at least one connected to a frame of the filter cartridge tab on the housing of the hood for closing in the course of a pivoting movement, wherein the tab is formed on the frame of the filter cartridge to form a hinge-like connection with the respectively associated recess of the housing of the hood for receiving the weight of the filter cartridge is substantially hook-shaped.

The starting point for a device according to the invention thus forms a known extractor hood, wherein the filter cartridge has at least one fixed tab and a sliding latch as fixing element or lock on substantially opposite sides of a frame. Even after a method according to the invention, the at least one tab is inserted into a correspondingly formed recess on the housing of the extractor hood first when inserting the filter cartridge. In contrast to known cooker hoods, however, this tab is now able to form a joint-like connection due to its hook-shaped configuration. As a result of this articulated connection, the filter cassette is already fixed to the housing of the extractor hood at an early stage of the closing movement in such a way that the fat filter no longer protrudes from this position even at a higher dead weight. and fall down. A subsequent, one-handed feasible pivoting movement is therefore carried out at greatly reduced effort, since the articulated connection between the tab and the housing of the hood already absorbs the weight of the filter cartridge. Even if accidentally releasing the filter cartridge, an arrangement according to the invention has a very advantageous effect, since here the filter cartridge now only oscillates around the articulated connection, but the filter cartridge can not fall down.

In a further development of the invention, the articulated connection between the hook-shaped tab of the frame of the filter cartridge together with a corresponding Recess on the housing of the hood formed such that the filter cartridge can be removed only in a range of a predetermined angular position. Preferably, a removal can be brought about only by slightly lifting the filter cartridge in this position.

In a preferred embodiment of the invention, the at least one hook-shaped tab is formed as an integral part of a corresponding part of the frame of the filter cartridge. Alternatively, the hook-shaped tab is manufactured as a single part and fixed at a corresponding point of the frame of the filter cartridge by riveting and / or welded.

Overall, in contrast to known solutions that work with security chains and customized recesses, etc., in an inventive device no additional and manually separate elements to be solved available. Nevertheless, even with a securing and fastening concept according to the invention, the removal of a filter cartridge from the hood will always require a deliberate release of the filter cartridge which prepares a user to reduce the risk of falling to increased force required due to the weight of the filter cartridge.

Figur 1:

einen Ausschnitt einer perspektivischen Darstellung einer erfindungsgemäßen Dunstabzugshaube während des Abschlusses eines Einsetz-Vorganges mit einer Detaileinblendung zur Verdeutlichung eines Verfahrensablaufes;

Figur 2:

eine vergrößerte Darstellung eines Rahmenteils einer Filterkassette mit einer Lasche zur Ausbildung einer gelenkartigen Verbindung und

Figur 3:

eine alternative Ausführungsform einer gelenk-artigen Verbindung eines Rahmenteils mit einer Filterkassette.

Further advantages of a device according to the invention are shown and described below with reference to the drawings with embodiments of the invention. In the drawing show:

FIG. 1:

a detail of a perspective view of an extractor hood according to the invention during the completion of an insertion process with a Detaileinblendung to illustrate a process flow;

FIG. 2:

an enlarged view of a frame part of a filter cartridge with a tab to form a hinged connection and

FIG. 3:

an alternative embodiment of a hinge-like connection of a frame part with a filter cartridge.

The figures of Figure 1 show a hood according to the invention 1 as a detail of a perspective view. For a better description of the components and simultaneous explanation of a method according to the invention, the illustrated view is rendered simplified. The method steps are indicated by a superimposed enlargement of section with depiction of a preceding method step and the respectively shown arrows in the illustration of FIG.

From a cooking point, not shown, cooking vapors are sucked via an exhaust air flow from a radial fan, which is arranged in the fume hood 1. On the way to the radial fan, however, the exhaust air stream first penetrates a grease filter 2, in which the vapor contained in the exhaust air flow is essentially stopped or intercepted.

To improve the cleaning effect or the effective removal of the contained Wrasens from the exhaust air flow out of the grease filter 2 is formed over a relatively large area and cascaded in the form of several, from the exhaust air flow to successive to be filtered filter layers. For reasons of appearance, as well as for reasons of relatively simple cleaning surface filter made of expanded metal and / or eddy current and labyrinth filters are used individually or in combination in the fat filter, especially in layering one above the other. Such filters can be manufactured as a pure metal filter made of stainless steel, so that they can be replaced by a user without customer service use after expiry of a use phase or with sufficient intake of fumes and completely cleaned by use in a commercial dishwasher again. With sufficient efficiency, however, the above-mentioned and currently increasingly used solutions are characterized by a relatively high weight. The fat filter 2 is therefore designed in the manner shown in Figure 1 as a filter matrix with a multi-layered internal structure in the form of individual segments, which in turn are designed to increase the mechanical stability, the prevention of additional rattling noises, etc. as a filter cassettes 3. The illustrated visible outer surface consists of the above-mentioned reasons of increasing the mechanical stability from a stainless steel expanded metal, which progressively followed onward inside further filter layers, which will not be discussed further at this point, since the structure of the grease filter 2 itself is not considered to be essential to the invention.

A first step in the insertion of such a filter cartridge 3 is shown in the enlarged detail drawing of Fig. 1. The filter cartridge 3 is bounded by a non-illustrated inner filter assembly by a frame 4 made of metallic extruded profiles. At a longitudinal edge 5 facing away from the user, two hook-shaped tabs 6 are arranged on the frame 4. In the manner illustrated by the two arrows in the detail of Figure 1, the tabs 6 are respectively inserted into associated recesses 7 of a housing 8 of the hood 1. Due to the hook-shaped design of the tabs 6 results in interaction with the recesses 7 each articulated connection between the filter cartridge 3 and the housing 8 of the hood 1. This articulated connection is designed to accommodate the weight of the filter cartridge 3. This ensures that the cassette 3 hang safely and without the intervention of a user and can subsequently be moved in the form of a direction indicated by the large arrow of Figure 1 rotational movement into a closed position. A fixing element 9 in the form of a lock or a known sliding latch is equipped with a type of grip on the cassette in a region near the frame 4 arranged so that a force necessary to close the cassette on the hood 1 force under favorable leverage by hand in the shown applied manner around a defined pivot point and is automatically used for secure locking of the cassette 3 on the hood 1.

When opening the hood 1, the fixing element 9 is actuated by hand, with the inventive articulated connection between the cassette 3 and the hood 1 and the housing 8, the filter cartridge 3, not in this case, with the result of possible injury to the operator or Damage to the hood 1 or a cooking surface placed below can fall down. The removal of the cassette 3 from the hood 1 out must rather be deliberately and deliberately brought about. For this purpose, a cancellation of the articulation of the filter cartridge 3 described above with the housing 8 of the hood 1 is to bring about. In this case, the hook-shaped part of the tab 6 can be seen from a respective recess 7 of the housing 8 by lifting the cassette 3. By education the hook-shaped curved portions of the tabs 6 and the associated recesses 7, this removal of the cassette 3 can be done only in a range of a predetermined angle of inclination of the cassette 3 relative to the housing 8 of the hood 1 in a convenient way for a user. This situation is indicated for the installation process in the detail drawing of Figure 1 and can also be used in the case of a removal in an analogous manner.

In the figure of Figure 2 is an enlarged view of the part of the frame 4 of the filter cartridge 3 is sketched as a section on which in the present embodiment, two tabs 6 to form a hinged connection between the cassette 3 and the housing 8 of the hood 1 in the above are provided described manner. The frame 4 is made of extruded metal. The two tabs 6 are integrally connected to the frame 4 in the present embodiment.

As well as in the extruded profiles of the remaining parts of the frame 4 of the filter cartridge 3 additional support rails 10 are integrally integrated into the frame 4 in manufacturing technology simple manner, which serve a fixation of filter materials 2 in a simple or cascaded form. In addition, the support rails 10 cause additional reinforcement and thus an increase in the bending stiffness of the entire frame. 4

An edge extraction of the resulting haze is effected in the present case in the region of the frame 4, characterized in that in the extruded profile of a respective frame portion recesses 11 have been introduced, here by punching and / or holes. To ensure a higher flow velocity in these edge regions, the filter material 2 arranged here behind the recesses 11 is of lesser thickness than the filter material which forms the actual surface of the cassette 3.

In an alternative embodiment, not shown, the tabs 6 are fixed at predetermined location as individual parts by rivets on the frame 4. Further, in another embodiment, the parts of the frame 4 are produced as punched and bent parts made of sheet metal, preferably being used as metallic materials, stainless steel or aluminum.

In the figures of Figures 3a and 3b, an alternative form of a hinge-like connection between a cassette 3 and a housing 8 of the hood 1 is shown. In this embodiment, a substantially T-shaped recess 7 is provided on the housing 8, in which a now substantially flat trained and double-hooked in plan view head portion 13 of a respective tab 6 is inserted. As indicated in the illustration of Figure 3b by the two arrows, resulting even after the insertion of the tab 6 in the recess 7 and lowering along the axis of gravity representing arrow up to the end of the T-shaped recess 7, a curved arrow for the For the expert in an understandable manner resulting rotational mobility of the under the action of the weight of the cassette 3 securely holding articulated fixation.

A drawn in the figure of Figure 3a length 1 of both sides of the head portion 13 provided recess 14 serves to adjust an angle under which the cassette 3 in articulated connection with the housing 8 of the hood 1 under elastic tension in a permanent rest position in the open Condition can be. This opening position can for example be used to replace components that are arranged in a manner not shown in the drawing behind the cassettes 3 in an interior of the housing 8 of the hood 1.

Also in further modifications of the hinged connection between a cassette and the housing 8, a very effective and always reliable securing of a cassette 3 against falling off in a replacement stage for maintenance purposes etc. is always effected without the use of additional elements according to the present invention. A device according to the invention is distinguished not only by significantly simplified production but also by a manner described above, simple and user-friendly in every respect.

Claims (11)

1. Extractor hood (1) for sucking away fumes, with a hood, the suction opening of which is covered by a filter cassette (3), wherein arranged at the filter cassette (3) is at least one strap which engages in a recess (7), which is provided in a housing (8) of the extractor hood (1), so as to detachably fix the filter cassette (3) to the housing (8), characterised in that the strap (6) of the filter cassette (3) is of substantially hook-shaped construction for formation of an articulation-like connection with the respectively associated recess (7) of the housing (8) of the extractor hood (1) for acceptance of the weight force of the filter cassette (3).
2. Extractor hood (1) according to claim 1, characterised in that the filter cassette has a frame (4), at which the strap (6) is arranged, and that the strap (6) is integrally connected with the frame (4) of the filter cassette (3).
3. Extractor hood (1) according to one or both of the preceding claims, characterised in that the strap (6) is produced as a separate part and is connected with the frame (4) by riveting and/or welding.
4. Extractor hood (1) according to one of the preceding claims, characterised in that the frame (4) is produced from extruded profile parts.
5. Extractor hood (1) according to one of the preceding claims 1 to 3, characterised in that the frame (4) is produced from punched and bent parts, which preferably consist of stainless steel.
6. Extractor hood (1) according to one of the preceding claims, characterised in that a recess (7) of the housing (8) of the extractor hood (1) is of substantially T-shaped construction.
7. Extractor hood (1) according to one of the preceding claims, characterised in that the filter cassette (3) has at substantially opposite sides of the frame (4) at least one stationary strap (6) and a slide latch (9) as fixing element or lock.
8. Extractor hood (1) according to one of the preceding claims, characterised in that the articulation-like connection between the hook-shaped strap (6) of the frame (4) of the filter cassette (3) together with a corresponding recess (7) at the housing (8) of the fume extractor hood (1) is constructed in such a manner that the filter cassette (3) can be removed only in a region of a predetermined angular setting, preferably by slight lifting of the filter cassette (3) into this setting.
9. Method for exchanging or insertion of filters, which are arranged above a suction opening of an extractor hood (1) according to one or more of the preceding claims, characterised in that on insertion of the filter cassette (3) initially the at least one strap (6) is introduced into a correspondingly formed recess (7) at the housing (8) of the fume extractor hood (1), whereby subsequently through an articulation-like connection the filter cassette (3) is now already fixed to the housing (8) of the fume extractor hood (1) in such a manner that the filter cassette (3) can no longer fall out and fall down from this position and a subsequent - in particular performable by one hand - pivot movement with locking is carried out in such a manner that the suction opening is covered at least partly by the filter cassette (3).
10. Method according to the preceding claim, characterised in that the filter cassette (3) is removed only in a region of a predetermined angular setting.
11. Method according to the preceding claim, characterised in that the filter cassette (3) is removed by slight lifting into this setting with release of the articulation-like connection.

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