DK3165701T3

DK3165701T3 - Ventilation element for window with flap that acts as harassment

Info

Publication number: DK3165701T3
Application number: DK16020421.0T
Authority: DK
Inventors: Albert Regensburger
Original assignee: Kockler Achim
Priority date: 2015-11-05
Filing date: 2016-10-27
Publication date: 2018-05-28
Also published as: HUE038436T2; DE102015014351A1; PT3165701T; EP3165701B1; EP3165701A1; PL3165701T3; ES2669535T3

Description

DESCRIPTION

The present invention relates to windows and doors, termed in common window element in the following. If in the following there is mention of a window element, then always either a window or a door is meant.

In particular, the present invention proceeds from a ventilating element for installation in a window element: wherein the ventilating element comprises a number of hollow boxes, wherein the respective hollow box has a respective lower recess at a lower side of the ventilating element in the vicinity of a horizontally extending edge of the ventilating element and has a respective upper recess at a side wall, which adjoins this horizontally extending edge, of the hollow box, and wherein a respective flap is pivotably mounted in the interior of the respective hollow box at a respective articulation point so that the respective flap is movable between a respective open setting and a respective closed setting.

Moreover, the invention proceeds from a window element: wherein the window element has an aperture frame by means of which the window element is securable in walling of a building, wherein the window element has a casement frame secured to the aperture frame, wherein the aperture frame or the casement frame has step fold against which when the window element is closed a seal arranged in the respective other frame bears, wherein the step fold has, in a section, a fold recess in which a ventilating element is arranged as a substitute for the step fold and wherein the horizontally extending edge of the ventilating element does not adjoin the frame having the step fold. A ventilating element of that kind and the window element provided with a ventilating element of that kind are known from, for example, DE 102 40 290 B4. In DE 102 40 290 B4 the hollow box has an intermediate cover by which the hollow box is divided into a lower chamber and an upper chamber. It is achieved by the intermediate cover that air flowing into the hollow box by way of the lower recess is deflected in zigzag manner before it can flow out of the hollow box by way of the upper recess. The articulation point of the flap is disposed in the region of that horizontally extending edge of the hollow box which lies diametrically opposite the already mentioned horizontal edge. By means of the flap the air channel between the intermediate cover and the upper side of the hollow box can be closed in a given case. The flap is actuated by the air draught on the one hand and gravitational force acting on a counterweight on the other hand. A ventilating element in which the above-mentioned features are also realised is known from DE 20 2010 002 002 U1. A respective length of the respective flap is greater than a respective upper spacing of the respective pivot point from the edge, which is furthest from the respective pivot point, of the respective upper recess. However, the length is smaller than a respective lower spacing of the respective pivot point from the edge, which is furthest from the respective pivot point, of the respective lower recess. The pivot point is disposed outside the region between the respective lower and the respective upper recess, which includes the horizontally extending edge. The upper recess is covered by means of the flap in the case of an air flow which is too strong. A ventilating element for installation in a window element is known from DE 297 21 460 U1, the ventilating element being constructed as a hollow box which has a lower recess at a lower side in the vicinity of a horizontally extending edge and an upper recess at a side wall adjoining this horizontally extending edge. In the case of DE 297 21 460 U1 the ventilating element does not have a flap. The air flow flowing through the ventilating element of DE 297 21 460 U1 is thus unregulated. A ventilating element for installation in a window element placed on an aperture frame of the window element is known from DE 297 17 061 U1. The ventilating element has a substantially U-shaped cross-section which is downwardly open. A flap is pivotably mounted in the interior of the ventilating element at a pivot point so that the flap is movable between an open setting and a closed setting. The pivot point is disposed in the horizontal section of the U-shaped cross-section in the vicinity of the transition to the closest limb of the U. Webs which constrain a meander-like course of the air flow can be arranged in the horizontal section of the U at the base part and at the top part.

The use of thermally insulating window elements with a high degree of joint tightness often has the consequence - particularly in autumn and winter - that mist forms in closed spaces insofar as a sufficient ventilation of the spaces is not otherwise guaranteed. Different solutions are therefore known in the prior art to ensure forced ventilation. In that regard, the problem is always present that at higher pressure differences between the two sides of the window element a high level of energy loss and draught phenomena - subjectively perceived to be unpleasant - are the result.

The energy losses and draught phenomena are limited by various solutions known from the prior art. However, the solutions of the prior art are usually suitable only for window elements of plastics material. At least the solutions according to the above patent documents are, however, also usable for window elements of wood.

The solution according to DE 102 40 290 B4 is relatively complicated. The solution according to DE 297 21 460 U1 is unregulated. The solution according to DE 297 17 061 U1 can be realised only with substantial constructional effort particularly in the case of already installed window elements.

The object of the present invention consists of creating a ventilating element for installation in a window element and a window element with a ventilating element of that kind, which avoid these disadvantages. In particular, the ventilating element shall be of simple and reliable construction and able to be used in the case of window elements of wood.

The object is fulfilled by a ventilating element with the features of claim 1. Advantageous embodiments of the ventilating element according to the invention are the subject of the independent claims 2 to 8.

According to the invention a ventilating element of the kind stated in the introduction is designed in the manner that: the respective articulation point is disposed in the region which is between the respective lower and the respective upper recess and which includes this horizontally extending edge, and a respective length of the respective flap is not only larger than a respective lower spacing of the respective articulation point from the edge, which is furthest from the respective articulation point, of the respective lower recess, but also larger than a respective upper spacing of the respective articulation point from the edge, which is furthest from the respective articulation point, of the respective upper recess so that the respective flap constrains air flowing into the respective hollow box by way of the respective lower or upper recess to be deflected in zigzag manner before it can flow out of the respective hollow box by way of the respective upper or lower recess.

The object is additionally fulfilled by a window element with the features of claim 9. Advantageous embodiments of the window element according to the invention are the subject of dependent claims 10 and 11.

According to the invention a window element of the kind stated in the introduction is configured in such a way that the ventilating element is constructed as a ventilating element according to the invention.

The respective flap is acted on by an airflow, which flows into the respective hollow box through the respective lower or upper recess and flows out of the respective hollow box through the respective upper or lower recess, with a pressure force which - referred to the respective flap - is directed from the respective open setting to the respective closed setting. Transfer to the respective closed setting takes place if this pressure force is sufficiently high. In many cases, the respective flap is disposed in the respective open setting when it is pivoted as far as possible towards the respective lower recess and in the respective closed setting when it is pivoted as far as possible towards the respective upper recess. However, in many cases the reverse procedure is realised.

The flap is preferably mounted at the hollow box by way of respective bearing elements or a respective film hinge, which with respect to pivotation of the respective flap relative to the respective hollow box does or do not oppose a force returning the respective flap to a predetermined rest position. This configuration is particularly simple to realise. If required, a restoring force can be realised by, for example, an additionally installed respective spring element.

In a particularly preferred embodiment the respective flap when pivoted as far as possible towards the respective lower and/or upper recess forms together with the side wall a respective angle different from 0° so that the respective flap in the absence of an air flow moves away, due to its gravitational force, from the side wall. A spring device is thus not required. In this case the ventilating element is arranged at an upper side or a lower side of the window element.

If a restoring force is desired, this can be produced by means of the already mentioned spring element. Alternatively it is possible for the respective flap to be connected with the respective hollow box by way of a respective connecting element so that pivotation of the respective flap relative to the respective hollow box produces a resilient deformation of the respective connecting element. The respective connecting element can be an independent element of the ventilating element. Alternatively, the respective connecting element can be integrally connected with the respective flap.

For preference, the respective flap when it is pivoted as far as possible towards the respective lower recess extends at an inclination towards the lower side as seen from the respective articulation point. It is thereby achieved that condensation water which can form due to temperature differences runs off the respective flap and (within the respective hollow box) drips onto the lower side.

The ventilating element additionally also has an upper side. For preference, a respective internal height of the respective hollow box, i.e. a spacing of the lower side from the upper side, is at a maximum in the region of the horizontally extending edge and moreover the respective internal height decreases strictly monotonically with increasing spacing from the side wall. Through this configuration it is achieved that condensation water which forms within the respective hollow box on the lower side or drips onto the lower side runs on the lower side towards the respective lower recess so that it can there exit from the respective hollow box. In the state of installation in the window element this thus corresponds with the lower side extending at an inclination with respect to the horizontal so that the lower has its deepest point in the region of the respective lower recess.

The respective articulation point is preferably disposed at the side wall and is spaced from the horizontally extending edge. A particularly efficient deflection of the air flow can be produced by this embodiment. Moreover, the overall flow resistance of the respective hollow box can be minimised.

In a further preferred embodiment of the ventilating element it is provided that the respective flap is of resilient construction at least in the region of its respective abutment edge remote from the respective articulation point. Alternatively or additionally it is possible that a respective abutment region of the respective hollow box, in which the respective flap bears in the closed setting against the respective hollow box, is of resilient construction. This on the one hand produces a solid sealing of the respective flow channel in the closed setting and on the other hand prevents chattering or the like. It is possible for the respective flap to be resilient as a whole. Alternatively, it is possible for the respective flap to be resilient only in the region of the respective abutment edge. In particular, in the case of an entirely resilient flap it is also possible to provide compensation by the respective flap for tolerances if the ventilating element and thus also the respective hollow box should distort due to, for example, temperature influences.

For preference, respective spacers are present, by means of which pivotation of the respective flap towards the lower side is limited before the respective flap rests on the lower side. As a result, it can be achieved in simple manner that the respective flow channel remains open even in the case of small pressure differences between inner side and outer side of the window element. The respective spacer and/or the respective flap is or are preferably of resilient construction in a respective contact region in which they contact one another. Chattering noises can thereby be avoided.

Further advantages and details are evident from the following description of embodiments in conjunction with the drawings, in which, in schematic basic illustration:

Fig. 1 shows a facade of a building,

Fig. 2 shows a section along a line ll-ll through the window element of Fig. 1,

Fig.3 shows a section along the line Ill-Ill through the window element of Fig. 1,

Fig. 4 shows a ventilating element illustrated to enlarged scale and

Fig. 5 shows a ventilating element in perspective view.

Fig. 1 shows a facade 1 of a building. A window element 2 is secured in the facade 1. The window element 2 can consist of, for example, wood, aluminium or plastics. Plastic represents the most frequent case. However, in the context of the present invention the window element 2 preferably consists of wood. The present invention is not, however, restricted to window elements 2 of wood.

The window element 2 comprises an aperture frame 3, by means of which the window element 2 is secured in the walling of the building. The window element 2 additionally comprises a casement frame 4, which is fastened to the aperture frame 3. The window element 2 can as a rule be opened. In this case the following statements always refer to the closed state of the window element 2. Alternatively, it is possible that the window element 2 cannot be opened. Then the window element 2 is always closed. In this instance the following statements therefore necessarily refer to the closed state of the window element 2.

Fig 2 shows a section along a line ll-ll through the window element 2 of Fig. 1. According to Fig. 2 the window frame 3 has a step fold 5. In this case a seal 6 is arranged in the casement frame 4. However, the converse arrangement can also be realised in which the casement frame 3 has the step fold 5. Then the seal 6 is arranged in the aperture frame 3. Regardless of whether one or the other configuration is realised, when the window element is closed the seal 6 bears against the step fold 5 in correspondence with the illustration in Fig. 2. The step fold 5 preferably consists of solid material, particularly in the case of a wooden window.

The step fold 5 is formed to be (substantially) encircling. In a specific section 7 (see Fig. 1) the step fold 5 has, however, a fold recess. The fold recess can be formed, for example, by milling in the step fold 5. The length of the section 7 can be determined in accordance with requirements. For example, it can be at 10 to 60 centimetres. According to Fig. 3, a ventilating element 8 is arranged in the section 7 as a substitute for the step fold 5. As a rule the section 7 is disposed at the upper side of the window element 2. Consequently, the ventilating element 8 in the normal case is arranged at the upper side of the window element 2. Alternatively, the ventilating element 8 can be arranged at the lower side of the window element 2. The ventilating element 8 can, for example, be screw-connected with the aperture frame 3. Alternatively, it is possible, for example, for it to be glued to the aperture frame. Other forms of fastening are also possible.

The ventilating element 8 has, in correspondence with the illustration in Figs. 3 and 4, a number of hollow boxes. As a minimum, only a single hollow box is present. In this case the ventilating element 8 is identical with the hollow box. This embodiment is explained in the following. An embodiment in which the ventilating element 8 has several hollow boxes is discussed later. The ventilating element 8 has an edge 9. As a rule the edge 9 extends horizontally. In the installed state of the ventilating element 8 the edge 9 does not adjoin the frame 3, 4 having the step fold 5. Adjoining this edge 9 on the one hand is a lower side 10 and on the other hand a side wall 11 of the ventilating element 8. The side wall 11 usually extends vertically. The lower side 10 usually extends - entirely or substantially - horizontally.

At the lower side 10 the hollow box has a recess 12, termed lower recess 12 in the following. In addition, the hollow box has at the side wall 11a further recess 13, termed upper recess 13 in the following. A flap 15 is pivotably mounted in the interior of the hollow box at an articulation point 14. As can be readily seen from Figs. 3 and 4, the articulation point 14 is disposed in the region between the lower and upper recesses 12, 13, which region includes the edge 9. The articulation point 14 is usually present at the side wall 11 and, in particular, at a location at which the articulation point 14 is spaced from the edge 9.

By virtue of the pivotable mounting at the articulation point 14 the flap 15 is movable between an open setting and a closed setting. The flap 15 is usually in the open setting when it is pivoted as far as possible towards the lower recess 12. This setting is illustrated in Fig. 4 in solid lines. The flap 15 is then disposed in the closed setting when it is pivoted as far as possible towards the upper recess 13. This setting is illustrated in Fig. 4 in dotted lines. The invention is explained in the following in connection with this configuration. However, in the alternative it is just as possible for the flap 15 to be disposed in the open setting when it is pivoted as far as possible towards the upper recess 13. In this case, the flap 15 is disposed in the closed setting when it is pivoted as far as possible towards the lower recess 12. In both configurations the flap 15 produces a volume flow limitation. A length I of the flap 15 is so dimensioned that the length I is greater than a spacing au. The spacing au is the spacing of the articulation point 14 from that edge of the lower recess 12 which is furthest from the articulation point 14. The length I of the flap 15 is in addition dimensioned in such a way that the length I is greater than a spacing ao. The spacing ao is the spacing of the articulation point 14 from that edge of the upper recess 13 which is furthest from the articulation point 14. The air which flows into the hollow box by way of the lower recess 12 is therefore deflected in zigzag manner by the flap 15 before it can flow out of the hollow box via the upper recess 13. The corresponding air flow is illustrated in dashed lines in Fig. 3. The same applies to the reverse air path. The flap 15 thus constrains the path of an air flow of that kind. The constraint of the zigzag flow offers, on the one hand, good sound protection and, on the other hand, good protection against driving rain.

By virtue of the presence of the ventilating element 8 a volume flow can thus be achieved between the outer side and the inner side of the window element 2 without the seal 6 having to be cut out or otherwise interrupted. Rather, the seal 6 remains undamaged. Moreover, it is possible for an inner seal and/or an outer seal to be present between the aperture frame 3 and the casement frame 4 in at least one further sealing plane. If this is the case, the inner seal or the outer seal is removed in a specific section. The section can correspond with the section 7. If the inner seal and/or the outer seal is or are not present, in certain circumstances a possibly remaining gap between the aperture frame 3 and casement frame 4 can be slightly widened, for example to approximately 2 millimetres.

As already mentioned, the flap 15 can be connected with the hollow box 8' by way of a connecting element, wherein the connecting element can be resiliently deformable. In this case, pivotation of the flap 15 relative to the hollow box 8' produces resilient deformation of the connecting element and thus a restoring force by which the flap 15 is to be loaded towards a rest setting. As a rule, in this case the rest setting is identical with the open setting. However, in the simplest case the flap 15 is mounted on the hollow box by way of bearing elements or a film hinge. Bearing elements or a film hinge do not oppose, with respect to pivotation of the flap 15 relative to the hollow box, a force restoring the flap 15 to a predetermined rest position. In this case the flap 15 when it is pivoted as far as possible towards the upper recess 13 forms an angle a with the vertical, i.e. in the usual case also with the side wall 11. It is thereby achieved that the flap 15 in the absence of an air flow moves due to its gravitational force away from the side wall 11, i.e., in particular, transfers by itself back into the open setting. The angle a can be selected as required. It is critical that it differs to a sufficient extent from 0°. For example, the angle a can be between 5° and 10°. Larger values are also possible. In analogous manner it is (alternatively or additionally) possible for the flap 15 to form an angle of that kind with the vertical (and thus in the usual case also with the side wall 11).

If the flap 15 is to be pivoted as far as possible towards the lower recess 12, the flap 15 preferably extends, as seen from the articulation point 14, at an inclination towards the lower side 10. In other words: the ventilating element 8 usually has an upper side 16. The upper side 16 in the installed state of the ventilating element 8 usually extends horizontally. A spacing d of the flap 15 from the upper side 16 is therefore larger the further from the side wall 11 it is measured. Due to its inclination the flap 15 in the open setting thus forms an angle β with the horizontal. The angle β can - analogously to the angle a - be determined as required. For example, the angle β can between 5° and 10°.

Particularly in the case of mounting of the flap 15 by way of a film hinge the film hinge can be constructed as a film which is an independent component produced separately from the flap 15 and the hollow box. In this case the film hinge can be constructed as a thin film. The film can, in particular, be so thin that it cannot be achieved by injection mounding. The film can in this case, for example, be placed in an injection-moulding tool by means of which the flap 15 is produced. Alternatively, the film can, for example, be glued to the flap 15.

The lower side 10 preferably extends at an inclination relative to the horizontal and, in particular, in such a way that the lower side 10 has its deepest point in the region of the lower recess 12. Due to the circumstance that the upper side 16 usually extends horizontally, an inner height h, i.e. the spacing of the lower side 10 from the upper side 16, is thus at a maximum in the region of the edge 9. With increasing spacing x from the side wall 11 the inner height h decreases strictly monotonically. It is possible that the wall thickness of the lower side 10 is uniform. If in this case an inclination of the lower side 10 is realised, the lower side is also inclined as seen from the outside. Alternatively, the wall thickness of the underside 10 can vary. In this case, notwithstanding the variation of the inner height h, thus the inclination of the lower side 10 relative to the upper side 16, a parallel course of the lower side 10 with respect to the upper side 16 as seen from the outside can be realised. Thus, as seen from the outside the ventilating element 8 can in correspondence with the illustration in Fig. 4 also have a rectangular cross-section in this case.

The flap 15 is preferably of resilient construction at least in the region of its abutment edge 17. The abutment edge 17 is that region of the flap 15 by which the flap 15 in the closed setting - depending on the respective length I of the flap 15 - abuts against the side wall 11 or the upper side 16 of the hollow box 8'. Alternatively or additionally to resilient construction of the abutment edge 17 an abutment region 18 of the hollow box 8' can be of resilient construction. The abutment region 18 is that region of the hollow box in which the flap 15 in the closed setting bears against the hollow box. In the case of mounting of the flap 15 by way of a film as a film hinge, the film can in addition be dimensioned in such a way that it forms the abutment edge 17, thus protrudes slightly (approximately 1 millimetre) beyond the flap 15 as such. In this case, chattering noises are prevented by the film. In addition, the sealing action is improved in this case.

For preference, the ventilating element 8 additionally comprises spacers 19. By means of the spacers 19 pivotation of the flap 15 towards the lower side 10 is to be limited before the flap 15 rests on the lower side 10. It is thereby achieved that in the corresponding setting of the flap 15 - particularly the open setting - an air flow arises even in the case of very small pressure differences, because then the spacers 19 have the effect that the flap 15 in the said setting does not completely close the air channel towards the bottom. The spacers 19 can be arranged at the flap 15. However, for preference they are arranged at the housing of the ventilating element 8 as such. The spacers 19 can be constructed as, for example, webs, edges or upwardly projecting pins arranged at the lower side 10 or other constructions. According to the illustration in Figure 4 they are small, round pin-like projections. For avoidance of chattering noises at the time of transition to the open setting, the flap 15 and/or the spacers 15 is or are preferably of resilient construction at least in that region in which it or they contact the flap 15 in the open setting. In analogous manner, spacers can also be present which limit pivotation of the flap 15 before the flap 15 rests on the upper side 16. These spacers are not illustrated in the figures. Similarly to the spacers 19 they can be constructed as, for example, webs, edges or downwardly projecting pins arranged at the upper side 16 or as other constructions. A configuration as small, round pin-like projections is also possible.

As already mentioned the ventilating element 8 is usually secured to the upper side or the lower side of the window element 2. If the flap 15 is actuated by gravitational force, an arrangement at one of these two sides is essential. If the flap 15 is acted on by a restoring force, for example by a spring element or by an appropriate design of the connecting element at the articulation point 14, the ventilating element 8 can, however, alternatively also be secured to the sides of the window element 2. Regardless of the location of the attachment of the ventilating element 8 to the window element 2, the side wall 11 of the ventilating element 8 is, however, always at that side which bears against the seal 6. In analogous manner the lower side 10 of the ventilating element 8 is always that side which has a common edge 9 together with the side wall 11 and does not bear against the aperture frame 3 or faces the window fold.

The flap 15 of the ventilating element 8 in the case of a first differential pressure between inside and outside transfers from the closed setting to the open setting and in the case of a second differential pressure between inside and outside transfers from the open setting to the closed setting. The first differential pressure is preferably smaller than the second differential pressure so as to produce a specific switching hysteresis. For preference, the ventilating element 8 is designed in such a way that the differential pressures lie between 10 and 70 Pa, particularly between 15 and 50 Pa.

With particular preference the embodiments explained in the foregoing can be supplemented in that within the hollow box a crossflow of the air flowing through the hollow box is caused to take place, thus a flow of the air in the direction of the pivot axis about which the flap 15 is pivotable. Due to the crossflow of the air, significantly improved noise protection arises. If the hollow box extends in the direction of the pivot axis over a total length L it is possible, for example in correspondence with the illustration in Fig. 5, for the lower opening 12 starting from one end of the hollow box to extend over a first sub-length L1 and the upper opening 13 starting from the other end of the hollow box to extend over a second sub-length L2 and further the sum of the two sub-lengths L1, L2 to be at most the same size as the total length L, preferably even smaller than the total length L. Alternatively or additionally air guide elements or chicanes, which oblige a deflection of the air flow, can be arranged in the hollow box.

Moreover, in many cases it is sufficient to use per window element 2 a single ventilating element 8 which has a single hollow box. However, it is not excluded that the ventilating element 8 has several hollow boxes. In this case the hollow boxes are arranged one behind the other as seen in the direction of the edge 9. They are separated from one another by partition walls extending orthogonally to the edge 9. The lower side 10, the side wall 11 and edge 9 as well as the upper side 16 are constituents of the ventilating element 8 as a whole, thus unitary for all hollow boxes. The lower recess 12, upper recess 13, articulation point 14, flap 15, associated abutment edge 17, abutment regions 18 and spacers 19 are individually present for the respective hollow box. Alternatively or additionally, it is equally possible, for use of a ventilating element 8 with several hollow boxes, to employ several ventilating elements 8.

If several hollow boxes - whether in a single ventilating element 8 or whether in several ventilating elements 8 - are present it is additionally possible for the hollow boxes to be of the same construction. Alternatively it is possible for the hollow boxes to be constructed in such a way that they have first and/or second differential pressures differing from one another. It can thereby be achieved that the different hollow boxes open or close in succession so that a multiply stepped switching effect is given.

The present invention has a number of advantages. In particular, the ventilating element 8 is not arranged in the fittings plane. It therefore cannot come into conflict with other elements, which are arranged in the fittings plane, of the window element 2. Moreover, the ventilating element 8 is not visible in the closed state of the window element 2, because it is arranged within the window fold. The use of the flap 15 itself as a chicane, which constrains the zigzag route of the airflow, simplifies the construction and build of the ventilating element 8. For a given constructional space, a higher volume flow is achievable than in the prior art. The reason for that is that the element limiting the volume flow narrows the flow cross-section to a substantially smaller extent than in the prior art. In addition, the construction of the ventilating element 8 is simpler.

The above description serves exclusively for explanation of the present invention. The scope of protection of the present invention shall, by contrast, be determined exclusively by the accompanying claims.

Reference numeral list 1 facade 2 window element 3 aperture frame 4 casement frame 5 step fold 6 seal 7 section 8 ventilating element 9 edge 10 lower side 11 sidewall 12 lower recess 13 upper recess 14 articulation point 15 flap 16 upper side 17 abutment edge 18 abutment region 19 spacer ao, au, d spacings h inner height L overall length L1,L2 sub-lengths I length α, β angle

Claims

A ventilation element (8) for incorporation into a window element (2), wherein the ventilation element comprises a plurality of hollow boxes, wherein the respective hollow box at a bottom side (10) of the ventilation element in the vicinity of a horizontal extending edge (9) of the ventilation element has a a lower recess (12), and at a lateral wall (11) adjacent to this horizontally extending edge (9) in the hollow box has a respective upper recess (13), where in the interior of the respective hollow box at a respective hinge point (14) is pivotally mounted a respective flap (15) so that the respective flap (15) can be moved between a respective opening position and a respective closing position, where the respective hinge point (14) is in the region between the respective lower and lower positions. the respective upper recess (12, 13) contained in said horizontally extending edge (9), wherein a respective length (1) of the respective flap (15) is greater than a respective lower distance (au) between the respective hinge point (14) and the furthest from the respective hinge point (14) of the respective lower recess (12), which is also greater than a respective upper distance (ao) between the respective hinge point (14) ) and the furthest edge of the respective hinge point (14) of the respective upper recess (13) so that the respective flap (15) forces air which flows into the respective lower or upper recess (12, 13) into it. hollow box, to be redirected zigzag-shaped, before it can flow out of the respective hollow box via the respective upper or lower recess (13,12).

Ventilation element according to claim 1, characterized in that the respective flap (15) is mounted on the respective hollow box via respective bearing elements or a respective film hinge which, in relation to a swing of the respective flap (15) relative to the respective hollow box (15). hollow box exerts no force which returns the respective flap (15) to a respective predetermined resting position.

Ventilation element according to claim 1, characterized in that the respective flap (15), when pivoted as far as possible towards the respective lower and / or upper recess (12, 13) together with the side wall (11) forms a respective angle (a) which is different from 0 ° so that, in the absence of an air flow, the respective flap (15) moves away from the side wall (11) due to its gravity.

Ventilation element according to claim 1, characterized in that the respective flap (15) is connected to the respective hollow box via a respective connecting element such that pivoting of the respective flap (15) relative to the respective hollow box provides a resilient deformation. of the respective connector.

Ventilation element according to any one of the preceding claims, characterized in that the respective flap (15), when pivoted as far as possible towards the respective lower recess (12) extends inclined with respect to the underside (10), viewed from the respective hinge point (14).

Ventilation element according to any one of the preceding claims, characterized in that the ventilation element has an upper side (16), that a respective internal height (h) of the respective hollow box is maximum in the area at the horizontally extending edge (9) and respective interior height (h) is strictly reduced monotonically with increasing distance from the sidewall (11).

Ventilation element according to any one of the preceding claims, characterized in that the respective flap (15) is formed at least in the region at its longest from the respective hinge point (14) elastic edge (17) and / or that a respective abutment area (18) in the respective hollow box against which the respective flap (15) in the respective closing position abuts the respective hollow box (8 ') is elastically formed.

Ventilation element according to any one of the preceding claims, characterized in that respective spacers (19) are provided by which a pivot of the respective flap (15) towards the underside (10) is limited before the respective flap (15) abuts the underside (10).

A window element, the window element comprising a frame (3), by means of which the window element can be fixed in the masonry of a building, the window element comprising a pivot frame (4) fixed to the frame (3), the frame (3) or the pivot frame (4). ) has a step seam (5) against which, with the closed window element, a seal (6) arranged in the respective second frame (4) abuts, where the step seam (5) in a section (7) has a recess in which a ventilation element (8) according to any one of the preceding claims is arranged as a replacement for the step drop (5), and the horizontal extending edge (9) of the ventilation element (8) does not abut the frame (3) provided with the step drop (5). , 4).

The window element according to claim 9, characterized in that the ventilation element (8) is designed in accordance with claim 3 and is arranged on an upper or lower side of the window element.

Window element according to claim 9 or 10, characterized in that the underside (10) extends inclined to the horizontal, so that the underside (10) in the region of the respective lower recess (12) has its lowest point.