EP2581670A1 - Extractor hood with pull-out screen - Google Patents

Abstract

The vapor fume hood (1) has an extractor housing (11) and displaceable extract screen (10) which is located opposite to the extractor housing. A constant force spring (12) is provided for assisting the displacement of the extract screen. The spring force is pointed in the direction of the roller (120) of the constant force spring.

Description

The invention relates to an extractor hood with pull-out screen.

In some types of cooker hood, for example, in so-called flat-screen hoods, a movable against the extractor hood of the extractor hood extract screen is provided. By moving the pull-out screen, which is also referred to below as a drawer, and in particular by a forward pulling out of the pull-out screen, the area can be sucked through the fumes and vapors in the extractor housing, can be increased. Also in other types of cooker hoods, such as in so-called Auszugsessen, a pull-out screen is in the form of a body. This can be moved at Auszugsessen relative to the fireplace as a vapor extraction housing and in particular moved forward. Again, the suction is increased.

Extensible screens in extractor hoods, in particular flat-panel hoods, are generally guided in telescopic rails or roller rails. In order to move the extract screen relative to the extractor housing in the rails, it is known that this is moved manually. In the DE 198 25 324 A1 In addition, an extractor hood is described in which the pull-out screen is moved over a spiral spring arranged behind the pull-out screen. As a result, the handling for the user can indeed be improved compared to a purely manual operation. However, the actuation or movement forces which the user has to apply in particular in the end region before the retraction of the extension screen must be high. Furthermore, various motorized displacement systems, which are also referred to as opening systems known. Here, the pull-out screen is brought into the operating position by motor, that is, extended or retracted.

A disadvantage of the manually operated systems is that the user must move the sometimes heavy pullout screen by hand and thus has to apply high forces. On the other hand, motor-driven systems have the disadvantage that they have a complex structure, must be subject to regular maintenance and are expensive to produce and to operate.

Object of the present invention is therefore to provide a cooker hood on which the pull-out screen can be moved easily and the construction of the hood is still easy.

The invention is based on the finding that this object can be achieved by using a suitable spring element to support the movement of the pull-out screen.

The object is therefore achieved by an extractor hood which has a fume hood housing and a pull-out screen which can be displaced with respect to the fume hood housing. The extractor hood is characterized in that the extractor hood has at least one scroll spring for supporting the displacement of the extension screen whose spring force points in the direction of the roller of the scroll spring.

As an extractor hood is preferably referred to a flat-panel hood in the context of the invention. But other cooker hoods with sliding pull-out screen, such as Auszugessen be understood as an extractor hood according to the invention. The extractor housing according to the invention designates the housing in which preferably the fan or the fan of the extractor hood is received. The pull-out screen, which is also referred to as a pull-out drawer or drawer, preferably has at least one inlet opening for the intake of fumes and vapors. In the extract screen, at least one filter element is preferably provided. In addition, the extract screen is preferably connected to the extractor housing so that in the extended state of the Ausziehschirms air flowing to the or in the Ausziehschirm, can be directed into the interior of the extractor housing. Preferably, the pull-out screen is horizontally displaceable. However, it is also within the scope of the invention that the pull-out screen is displaced in a direction deviating from the horizontal direction.

The opposite to the extractor housing extended or extended state of the pull-out screen is also referred to below as the operating position. The retracted on the or in the extractor housing or retracted state of the pull-out screen is also referred to below as the rest position. The movement between the resting position and the Operating position and vice versa is referred to as moving or method. The distance by which the pull-out screen is displaced is referred to as travel or displacement.

According to the invention, the hood on at least one scroll spring to support the displacement of the extension screen, the spring force points in the direction of the roller of the scroll spring.

As a scroll spring, a spring element or a spring is referred to, which is a special form of a coil spring and has no winding spacing. In the relaxed state, therefore, the turns of the spring element are directly adjacent to each other. One of the ends, which is also referred to below as a free end, preferably extends tangentially to the roller in which the turns of the spring element are rolled up. The spring force of the scroll spring keeps the spring over its entire length, minus the free end in the rolled-up state, that is directed from the free end to the roll of the scroll spring. According to the invention, at least one scroll spring is provided in the extractor hood. It is also provided in the scope of the invention, a plurality of rolling springs. For the sake of clarity, reference will be made below to a scroll spring. However, the statements apply - as far as applicable - also respectively for several roller springs, without this being mentioned.

The support of the displacement of the extension screen, which is effected by the scroll spring, is preferably carried out in a direction of displacement by the spring force of the scroll spring. In the opposite direction of displacement, the support of the displacement takes place by the scroll spring is at least partially used as a guide for the pull-out screen and in particular tilting of the pull-out screen is prevented. In addition to the scroll spring, further guide elements, such as rails or rollers, may be provided in the extractor hood according to the invention, but are not absolutely necessary.

The scroll spring may be mounted on the axle of the roller. According to the invention, it is also possible to provide no fixed bearing of the scroll spring on the axis, but to arrange the roller with its outer turn on a component, so that when rolling the roller, the outer turn is pressed against the component. The component may be, for example, a web or wedge.

By using a scroll spring as a spring element in the extractor hood according to the invention, a number of advantages can be achieved. On the one hand, roller springs can have a constant spring characteristic. When using such a scroll spring, a constant operating force over the entire length of the displacement can be achieved. As a result, the motive force, which is necessary to move the pull-out screen in the opposite direction, is constant over the entire displacement path. In particular, for a movement out of the end positions, that is, from the rest position or operating position of the pull-out umbrella, when using a scroll spring with spring characteristics that deviate from a constant spring characteristic, no large forces to overcome. In addition, a scroll spring in the relaxed state on a small size, whereby only a small space in the hood for the scroll spring must be provided. Finally, a scroll spring is robust, so that extension screens can be moved with great weight by means of the scroll spring or the roller springs.

According to a preferred embodiment, the scroll spring is oriented so that the axis of the roller of the scroll spring is perpendicular to the surface of the pull-out screen. By this arrangement of the scroll spring, the height, which is necessary for the accommodation of the scroll spring, low. On the other hand, in this arrangement, the diameter of the roll can be large, since it lies in the horizontal and can be easily included in the pull-out screen or in the extractor housing even at low height of the pull-out screen.

According to a preferred embodiment, the scroll spring in the extended state of the Ausziehschirms, ie the operating position of the Auszugsschirms, relaxed. In the rest position, however, the scroll spring is preferably taut. This ensures that the extension of the extension screen due to the scroll spring can be done completely automatically with sufficient spring force. The user therefore does not have to apply additional force for this movement. For inserting the pull-out screen, the user only has to counteract the spring force. Since these can be constant over a spring on the spring travel, the applied by the user opposite force is low and especially in the final phase or initial phase of insertion no higher or only slightly higher forces must be applied.

According to one embodiment, the extractor hood on two roller springs, which are arranged on the longitudinal edges of the extension screen. Longitudinal edges here are understood to be the edges which lie in the direction of displacement of the extension screen. As an arrangement of the rolling springs at these edges, is preferably understood an arrangement in which the unwound portion of the scroll spring, that is, the tangentially extending from the roll part inside or outside the longitudinal edge of the pull-out screen or runs at a small distance from the longitudinal edge , The roll of the scroll spring is arranged, in particular in the embodiment in which the axis of the roller is perpendicular to the surface of the pull-out screen, facing away from the longitudinal edge on or adjacent to the unwound region. Thus, a straight-line unwinding of the roll can take place.

By a roll spring is provided on each longitudinal side of the pullout umbrella, a straight-line extension of the pullout umbrella can be ensured, since during extension preferably the spring force acts on the pullout umbrella and this spring force rests on both sides of the pullout umbrella. For this purpose, the two roller springs on the two sides of the Ausziehschirms preferably with the same spring force. In addition, the arrangement of the rolling springs on the longitudinal edges of the extension screen has the advantage that the free end of the scroll spring can be easily attached to the back of the pull-out screen or the front of the extractor housing, in particular a frame of the extractor housing.

According to one embodiment, the scroll spring is arranged in the extractor housing, in particular a frame of the extractor housing. At least the role of the scroll spring in the extractor housing and in particular in the frame is added. In the case of an unrolled roll spring, the unrolled region of the roll spring is also preferably located in the frame. As a frame part of the extractor housing is referred to, which is provided on the underside of the hood and in which, for example, a suction with filter element can be arranged. The frame preferably has a forwardly open U-shape. The roller springs are preferably arranged with their role in the front region of the legs of the U-shape in such a shape of the frame. In the arrangement of the scroll spring in the frame of the extractor housing preferably the free end of the scroll spring extends out of the frame to be connected to the pull-out screen can. The advantage of the arrangement of the roller spring in the frame of the extractor housing is that this can be freely designed in terms of width and height in the rule. In addition, the inclusion of the scroll spring in the frame, the provision of a separate housing is not required and the scroll spring is still protected from contamination.

Alternatively or additionally, at least one of the roller springs can be accommodated in the pull-out screen. Again, at least the role of the scroll spring is included in the pull-out screen. In the case of an unrolled roll spring, the unrolled region of the roll spring is also preferably located in the pull-out screen. The free end of the scroll spring preferably projects beyond the side of the pullout umbrella to be attached to the extractor housing and in particular the pullout umbrella. The scroll spring is preferably arranged in the pull-out screen in the rear area. When unwinding the scroll spring, the unwound region preferably extends along the longitudinal edge of the extension screen. The unwound area can in this case run inside the pull-out screen or outside of the pull-out screen. An advantage of the arrangement of the scroll spring in the pull-out screen is that the extractor housing does not need to be changed, that is, the equipped with the roller springs Ausziehschirm can also be provided on a conventional extractor housing.

Preferably, at least the roller of the scroll spring is thus held in a housing in the extractor housing or a receiving space in the pull-out screen. The housing in the extractor housing and the receiving space in the pull-out screen can be created by elements, such as wedges or webs, which extend into the respective interior, thus defining a separate space. The elements bounding the receiving space or the housing on one side are preferably designed so that they do not cover the entire width of the extractor housing or of the frame or the pull-out screen. As a result, a passage for the unwound region of the scroll spring is maintained.

Preferably, a latching element of a latching connection is provided on the pull-out screen and the extractor housing. The latching elements of the latching connection preferably interact with one another such that the latching connection is released by a single application of pressure. The locking elements are at an embodiment of the hood, wherein the roller springs are stretched in the retracted state of the extension screen, preferably provided in the rear region of the extension screen and on a region of this opposite surface of the extractor housing, in particular of the frame. In this way, the pull-out screen can be held in the rest position against the spring force of the scroll spring by the latching connection. If the locking connection is released, the pull-out screen can move by the spring force in the operating position. The latching elements can also be provided instead of in the rear region of the pull-out screen, for example, on the back of a handle strip of the pull-out screen, which has a greater width than the rest of the pull-out screen, and cooperate with latching elements, which are provided on the front of the extractor hood, in particular the frame ,

The extractor hood preferably has at least one damping element for damping the movement of the pull-out screen at least at the beginning and / or end of the travel path of the pull-out screen. The damping element can be provided in the extractor housing, in particular in the frame, and cooperate with a projection or arm protruding at least laterally from the extension screen. Preferably, the damping element is arranged so that it slows down the movement of the Ausziehschirms in the last phase of extension of the Ausziehschirms, that is shortly before the operating position, that is slowed down. Although it is spoken of only one damping element, of course, a plurality of damping elements can be provided.

According to one embodiment, the scroll spring at its free end on a bend for applying to the back of the Ausziehschirms or on the front of a frame of the extractor housing. As a result, the attachment of the free end is further facilitated. It may be sufficient to apply the fold to the pull-out screen or the extractor housing, in particular the frame. Preferably, however, the fold is also attached in this embodiment to the pull-out screen or the extractor housing to prevent accidental slipping.

• Figur 1: eine schematische Unteransicht einer ersten Ausführungsform eines Auszugsschirms an einem Dunstabzugsgehäuse in der Betriebsposition;
• Figur 2: eine schematische Unteransicht der Ausführungsform eines Auszugsschirms an einem Dunstabzugsgehäuse nach Figur 1 in der Ruheposition;
• Figur 3: eine schematische Detailansicht der Rollfeder aus Figur 1;
• Figur 4: eine schematische perspektivische Detailansicht der Rollfeder aus Figur 1;
• Figur 5: eine schematische Unteransicht einer zweiten Ausführungsform eines Auszugsschirms an einem Dunstabzugsgehäuse in der Betriebsposition;
• Figur 6: eine schematische Unteransicht der Ausführungsform eines Auszugsschirms an einem Dunstabzugsgehäuse nach Figur 5 in der Ruheposition; und
• Figur 7: eine schematische perspektivische Detailansicht der Rollfeder aus Figur 5.

The invention will be explained again below with reference to the accompanying drawings. Show it:

• FIG. 1 a schematic bottom view of a first embodiment of a pull-out screen on a fume hood housing in the operating position;
• FIG. 2 : A schematic bottom view of the embodiment of a pull-out screen on a fume hood after FIG. 1 in the resting position;
• FIG. 3 : a schematic detail view of the scroll spring FIG. 1 ;
• FIG. 4 : A schematic perspective detail view of the scroll spring FIG. 1 ;
• FIG. 5 : a schematic bottom view of a second embodiment of a pull-out screen on a fume hood housing in the operating position;
• FIG. 6 : A schematic bottom view of the embodiment of a pull-out screen on a fume hood after FIG. 5 in the resting position; and
• FIG. 7 : A schematic perspective detail view of the scroll spring FIG. 5 ,

In FIG. 1 is a schematic bottom view of a first embodiment of the pull-out screen 10 is shown on an extractor hood 1 in the operating position. In the illustrated view, only the frame 110 of the extractor housing 11 and the pull-out screen 10 are shown. The other components of the hood 1, such as filter elements and the like are not shown.

The extractor hood 1 comprises a frame 110 of a fume hood housing 11, which may, for example, constitute the lower part of a flat-screen hood. The frame 110 has a still open front U-shape. At the base of the U-shape of the frame 110, a latching element of a latching device 14 is provided at the front in the middle.

The frame 110 is preferably hollow and can be made of sheet metal, for example. Between the legs of the U-shape of the frame 110, a pull-out screen 10 is held.

In the front end of one of the legs of the U-shape of the frame 110, a rearwardly acting damping element 15 is provided. Furthermore, in the front ends of both legs of the U-shape of the frame 110 each have a scroll spring 12, in particular the roller 120 of the scroll spring 12 was added. The roller 120 is held between the front of the leg and a wedge 111 provided in the leg. The wedge 111 extends in the width direction of the extractor housing 11 and in particular the leg of the U-shape of the frame 110. However, to the inner edge of the leg of the U-shape of the frame 110 of the wedge 111 is spaced. In addition, the wedge 111 has a lower height than the leg of the U-shape of the frame 110. Between the front of the leg of the U-shape of the frame 110 and the wedge 111 thus a housing 13 for receiving the scroll spring 12 is defined. The axis of the rollers 120 is perpendicular to the surface of the frame 110 and thus also perpendicular to the surface of the extension screen 10. The tangential part or unwound portion 121 of the scroll spring 12 extends rearwardly. At the free end 122 of the scroll spring 12, the spring material of the scroll spring 12 is bent outward. This fold 123 projects beyond the inside of the frame 110 and abuts against the back of the pull-out screen 10.

The pull-out screen 10 has a substantially rectangular shape and also preferably hollow. In the pull-out screen 10, filter elements (not shown) are furthermore preferably accommodated. At the front of the pull-out screen 10, a handle bar 102 is provided, which has a width which is greater than the width of the remaining body of the pull-out screen 10. As a result, the handle bar 102 on the sides of the pull-out screen 11 on the body of the pull-out screen 10 over. At the rear of the pull-out screen, that is, the side facing the base of the U-shape of the frame 110, arms 100 extend rearwardly at the two lateral ends of the pull-out umbrella 10. The arms 100 are angled at the free ends to the outside and engage in the inner sides of the legs of the U-shape of the frame 110 a. Furthermore, a latching element of a latching device 14 is provided in the middle of the rear of the pull-out screen 10. This locking element can cooperate with the latching element of the latching device 14 at the base of the U-shape of the frame 110. This will be explained later in more detail.

In FIG. 1 the operating state of the extractor hood 1 is shown, in which the pull-out screen 10 is in the operating position. In this state is the Pull-out screen 10 from the extractor housing 11, in particular the frame 110 pulled out, that is, relative to the frame 110 moves forward and is about the front of the frame 110 via. The rear portion of the pull-out screen 10 is further held between the legs of the U-shape of the frame 110. In the operating position, in the illustrated embodiment, the angled region of one of the arms 100 of the pull-out screen 10 bears against the damping element 15 in the frame 110 and acts on it. The scroll spring 12 is relieved in this operating position, that is, the spring material is rolled up on the roller 120.

If the extract screen 10 from the in FIG. 1 shown operating position in the in FIG. 2 shown rest position, the user can do this by pressure on the front of the pull-out screen 10, in particular on the handle bar 102. By pressing on the pull-out screen 10 this is moved backwards or moved. The shifting may be assisted by slides or rollers (not shown) in the frame 110 and / or the pull-out screen 10. When moving the extension screen 10 to the rear, the back of the extension screen 10 acts on the fold 123 of the scroll spring 12 and thereby causes the spring material is rolled against the spring force of the scroll spring 12 of the roller 120. The unwound portion 121 of the scroll spring 120 extends in the frame 110 parallel to the side wall of the pull-out screen 10. The roller 120 of the scroll spring 12 is held during the displacement of the pull-out screen 10 to the rear by the wedge 111 in position on the outer turn of the Roller 120 works.

When reaching the in FIG. 2 shown rest position, the locking elements of the latching device 14 come into contact and lock. As a result, the loaded by the tensioned scroll spring 12 forward excerpt 10 is held in the rest position. In the illustrated embodiment, in the rest position, the back of the handle bar 102 at the front of the legs of the U-shape of the frame 110 at.

In order to bring the pullout umbrella 10 from the rest position back to the operating position, it requires in the illustrated embodiment, only a short pressure on the front of the pullout umbrella 10. This opens the designed as a push-to-open latching device 14, that is, the locking elements of Locking device get out of the mutual engagement and the pull-out screen 10 can be moved. By the spring force, which is directed at the tensioned scroll spring 12 forward, the pull-out screen 10 is automatically pushed forward, that is shifted. In the final phase of extension of the pull-out screen 10, the angled portion of the arm 100 of the pull-out screen 10 comes into contact with the front side of the damping element 15. The further displacement of the extension screen 10 to the operating position is now damped by the damping element 15, that is braked or slowed down. Once the damping element 15 has reached its end position, the extension screen can not be moved further forward and is in the operating position. In addition, in the extractor housing 11 also stops (not shown) may be provided which hold the pull-out screen 10 in the operating position, that is to prevent further displacement of the pull-out screen 10 forward.

In the FIGS. 3 and 4 the state of the scroll spring 12 is shown in more detail in the operating position of the pull-out screen 10. The arrangement of the damping element 15 below the scroll spring 12 can be found in these figures. How the FIGS. 3 and 4 can be seen, the damping element 15 has a displaceable rod which is retracted in the operating position of the pull-out screen 10 in a sleeve of the damping element 15. When retracting the pull-out screen 10, this rod is displaced by damping means in the damping element 15, which may be spring means, for example, in the sleeve to the rear until the rod reaches an end position. In the end position of the rod, the contact between the angled portion of the arm 100 of the pull-out screen 10 and the damping element 15 dissolves.

In FIG. 5 is a schematic bottom view of a second embodiment of the pull-out screen 10 is shown on an extractor hood 1 in the operating position. The structure of the second embodiment is substantially the same as that of the first embodiment. Only the arrangement of the scroll spring 12 is different in this embodiment. The other components of the cooker hood and their operation is therefore not explained again but in this respect full reference to the comments on the FIGS. 1 to 4 directed.

Furthermore, in the second embodiment, in each case a web 101 is provided in the rear region of the extension screen 10 in the lateral corner areas. This extends parallel to the back of the pull-out screen 10th and is preferably arranged on the ceiling or the bottom of the pull-out screen 10. The height of the web 101 is less than the height of the extension screen 10. The width of the web 101 is also substantially smaller than the width of the Ausziehschirms 10. In addition, the web 101 is arranged in the illustrated embodiment, that of the lateral edge of the Ausziehschirms 10 is spaced. Between the rear side of the pull-out screen 10 and the front side of the web 101, a receiving space 103 is formed in each case in the two rear corner regions of the pull-out screen 10.

In the receiving space 103, the roller 120 of a scroll spring 12 is received. In the illustrated embodiment, a roller 120 of a scroll spring 12 is received in each of the two receiving spaces 103. The axis of the rollers 120 is perpendicular to the surface of the Ausziehschirms 10. The tangential part or unwound portion 121 of the scroll spring 12 extends forward. At the free end 122 of the scroll spring 12, the spring material of the scroll spring 12 is bent outward. This fold 123 protrudes beyond the side of the pull-out screen 10 and abuts against the front side of the frame 110, in particular the leg of the U-shape of the frame 110.

In FIG. 5 the operating state of the extractor hood 1 is shown, in which the pull-out screen is in the operating position. In this state, the pull-out screen 10 is pulled out of the extractor housing 11, in particular the frame 110, that is, moved forward relative to the frame 110 and protrudes beyond the front of the frame 110. The rear portion of the pull-out screen 10 is further held between the legs of the U-shape of the frame 110. In the operating position, in the illustrated embodiment, the angled region of one of the arms 100 of the pull-out screen 10 bears against the damping element 15 in the frame 110 and acts on it.

If the pull-out screen 1 from the in FIG. 5 shown operating position in the in FIG. 6 shown rest position, the user can do this by pressure on the front of the pull-out screen 10, in particular on the handle bar 102. By pressing on the pull-out screen 10 this is moved backwards or moved. The shifting may be assisted by slides or rollers (not shown) in the frame 110 and / or the pull-out screen 10. When moving the pull-out screen 10 to the rear acts the Front side of the legs of the U-shape of the frame 110 on the fold 123 of the scroll spring 12 and thereby causes the spring material is rolled against the spring force of the scroll spring 12 of the roller 120. The unwound portion 121 of the scroll spring 120 extends in the pull-out screen 10 parallel to the side wall of the pull-out screen 10. The roller 120 of the scroll spring 12 is held during the displacement of the pull-out screen 10 forward by the web 101 in position, which on the outer turn of the Roller 120 works.

When reaching the in FIG. 6 shown rest position, the locking elements of the latching device 14 come into contact and lock. As a result, the loaded by the tensioned scroll spring 12 forward excerpt 10 is held in the rest position. In the illustrated embodiment is in the rest position, the back of the handle bar 102 at the front of the legs of the U-shape of the frame 110 and the fold 123 of the scroll spring 12 is located between the back of the handle bar 102 and the front of the legs of the U-shape of the Frame 110.

In order to bring the pullout umbrella 10 from the rest position back to the operating position, it requires in the illustrated embodiment, only a short pressure on the front of the pullout umbrella 10. This opens the designed as a push-to-open latching device 14, that is, the locking elements of Locking device get out of the mutual engagement and the pull-out screen 10 can be moved. By the spring force, which is directed at the tensioned scroll spring 12 forward, the pull-out screen 10 is automatically pushed forward, that is shifted. In the final phase of extension of the pull-out screen 10, the angled portion of the arm 100 of the pull-out screen 10 comes into contact with the front side of the damping element 15. The further displacement of the extension screen 10 to the operating position is now damped by the damping element 15, that is braked or slowed down. Once the damping element 15 has reached its end position, the extension screen can not be moved further forward and is in the operating position. In addition, in the extractor housing 11 also stops (not shown) may be provided which hold the pull-out screen 10 in the operating position, that is to prevent further displacement of the pull-out screen 10 forward.

In the FIG. 7 the state of the scroll spring 12 is shown in more detail in the operating position of the pull-out screen 10 of the second embodiment. The arrangement of the damping element 15 below the scroll spring 12 can be found in these figures.

The present invention is not limited to the illustrated embodiments.

The present invention has been described essentially with reference to flat panel hoods. By appropriate modification and, if appropriate, repositioning in the extractor hood, the invention can also be used in wall meals, which are also referred to as extract meals, or for so-called downdraft extractor hoods.

The extract mechanism of the extractor hood according to the invention is preferably composed of the following components. The mechanism, which is also referred to as an opening system or system, comprises in particular at least one scroll spring, the rolled-up body part of which is fixed, a movable pull-out screen, which in one embodiment is positively or non-positively connected to the free end of the scroll spring, according to one embodiment a fixed housing, which holds the non-angled part of the scroll spring in position. Furthermore, the system preferably comprises guide components, which allow a translation of the drawer with respect to the housing and a push-to-open unit, as a detent unit consisting of two interlocking lockable components and at least one damping component, the final phase and / or Initial phase of the extension process dampens.

In principle, the opening system can be designed so that the scroll spring are positioned in the stationary housing or in the movable drawer.

The system is preferably designed so that the scroll spring in the extended state of the pull-out screen is always in the almost relaxed state, that is rolled up. In terms of the extractor hood, this means that the main functionality of the extending pull-out screen in the operating state is a slight pressure on the pull-out screen when the push-to-open unit is opened is released and the pullout umbrella extends by means of the relaxing scroll spring. The actuation path of the push-to-open unit can be, for example, in the range of 0.5 to 3.5 mm.

The pull-out screen with a relatively low but constant total weight is applied over the entire travel path with a preferably constant or correspondingly slightly varying spring force, for example due to overcoming the static friction in the system, and extends to the front limit stop. The spring force is dimensioned so that it takes into account the frictional resistance of the system and possibly oblique installation situations of the pull-out screen.

Both in the initial phase of the automatic path and towards the end damping elements can make the movement characteristics for the user of the hood qualitatively pleasant. The invention includes an automatic, non-motor driven extension of the pull-out screen in the respective operating state, in which the optimal Wrasenabsaugung can be achieved.

Retraction of the pull-out screen is done by hand against the spring force of the roller springs. This force to be overcome by hand should therefore be very low and not unpleasant for the user. In the end position of the retraction process, the push-to-open unit is again active, which ensures the retention of the drawer against the forces of the roller spring system.

When extending in the vertical direction, for example in so-called downdraft deductions, the existing in the hood roller springs are designed so that they can compensate for the frictional forces and the weight of the moving extension screen and overcome.

Basically, it is also possible to build the roller springs so that the relaxed state of the scroll spring is generally present at retracted position of the pull-out screen. This means that the extended state must then be held by locking or locking elements. After releasing the latch, the pull-out screen would automatically move back to the retracted position. In this case, a damping element is preferably provided for damping the movement before reaching the rest position. A number of advantages can be achieved with the present invention. In particular, regardless of the weight of the part to be moved, that is to say of the pull-out screen with a corresponding counter-force design of the roller springs, low actuating forces in the horizontal and vertical directions may suffice. In addition, a constant operating force over the entire length of the Einfahrweges be ensured by using the scroll springs. By integrating a damping element excellent haptic properties can be achieved. The triggering of the extension operation of the pull-out screen is preferably achieved by a push-to-open operation.

LIST OF REFERENCE NUMBERS

1

Hood

10

excerpt screen

100

poor

101

web

102

handle bar

103

accommodation space

11

Extractor housing

110

frame

111

wedge

12

roll spring

120

role

121

unwound area

122

free end

123

fold

13

casing

14

locking device

15

damping element

Claims (10)

An extractor hood, which has a fume hood housing (11) and a pull-out screen (10) displaceable relative to the fume hood housing (11), characterized in that the fume hood (1) has at least one scroll spring (12) for supporting the displacement of the pull-out screen (10) Spring force in the direction of the roller (120) of the scroll spring (12) points. Extractor hood according to claim 1, characterized in that the scroll spring (12) is oriented so that the axis of the roller (120) is perpendicular to the surface of the Ausziehschirms (10). Extractor hood according to one of claims 1 or 2, characterized in that the scroll spring (12) in the extended state of the extension screen (10) is relaxed and tensioned in the retracted state of the extension screen (10). Extractor hood according to one of claims 1 to 3, characterized in that the extractor hood (1) has two roller springs (12) which are arranged on the longitudinal edges of the extension screen (10). Extractor hood according to one of claims 1 to 4, characterized in that the scroll spring (12) in the extractor housing (11), in particular a frame (110) of the extractor housing (11) is arranged. Extractor hood according to one of claims 1 to 5, characterized in that the scroll spring (12) is received in the pull-out screen (10). Extractor hood according to one of claims 1 to 6, characterized in that on the extract screen (10) and the extractor housing (11) each have a latching element of a latching device (14) is provided. Extractor hood according to one of claims 1 to 7, characterized in that the extractor hood (1) at least one damping element (15) for damping the movement of the Ausziehschirms (10) at least at the beginning and / or at the end of the travel path of the Ausziehschirms (10). Extractor hood according to one of claims 1 to 8, characterized in that at least the roller (120) of the scroll spring (12) in a housing (13) in the extractor housing (11) or a receiving space (103) in the pull-out screen (10) is held , Extractor hood according to one of claims 1 to 9, characterized in that the roller spring (12) at its free end (122) has a fold (123) for application to the back of the Ausziehschirms (10) or on the front of a frame (110) of the Extractor hood housing (11).

Images