Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
  • F24F13/02—Ducting arrangements
  • F24F13/06—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser
  • F24F13/065—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser formed as cylindrical or spherical bodies which are rotatable
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
  • F24F13/02—Ducting arrangements
  • F24F13/06—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
  • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
  • F24F13/082—Grilles, registers or guards
  • F24F13/084—Grilles, registers or guards with mounting arrangements, e.g. snap fasteners for mounting to the wall or duct

Definitions

• the invention relates to an improved swirl diffuser in which a laminar airflow is developed which runs substantially tangential to the holder plate of the swirl diffuser.
• Swirl diffusers and many ventilation systems, use the Coanda effect to direct airflows to desired zones or directions, while keeping the airflows laminar (or minimally turbulent).
• Swirl diffusers are often recessed into the ceiling, typically with a rear plenum. The aim here is to generate the airflows tangentially along the ceiling, so that they go down via the walls, and in this way do not blow 'directly' on people in the room.
• a laminar airflow enhances the coherence of the airflow, so that the airflow can be better controlled, and thus directed to a target zone, with minimal loss of flow.
• the Coanda effect plays a role in this, as it ensures that the airflow follows a (spherical) surface, and thus leads to an airflow that follows the ceiling, instead of being blown downwards into a room. This can be achieved quite easily by suitably curving the drums and drum housings of swirl diffusers.
• the present invention aims to find a solution to at least some of the above-mentioned problems, and to ensure that the transition between the holder plate and the airflow directing elements (drum and drum housing) is as continuous as possible.
• the invention relates to an improved swirl diffuser according to claim 1.
• the swirl diffuser comprises a substantially flat holder plate and a plurality of airflow directing elements.
• the holder plate is provided with a plurality of substantially rectangular apertures. Preferably, at least a portion (25%, 50%, 75% or more) of the apertures extend radially into the holder plate relative to a central point or zone.
• the apertures are provided on both longitudinal sides with side flanks extending partially inwardly into the aperture, which side flanks are located at least partially posterior to the plane of the holder plate, and located at least partially in a half-space (defined by the plane of the holder plate) at the rear of the plane of the holder plate, preferably wherein the free ends of the side flanks are located at the rear side of the holder plate.
• the airflow directing elements each comprise a longitudinal chamber (or drum housing) and an air deflector (or drum), the air deflector being mounted rotatably about a longitudinal rotational axis in the chamber, the chamber comprising an open window through the chamber, the open window spanning substantially the entire longitudinal dimension of the chamber.
• the air deflector in the chamber is adapted to substantially completely close the open window in a first position, and to leave the window at least partially open in a second position, the air deflector being rotatably adjustable between the first and second positions.
• the airflow directing elements preferably the chamber, have a top side which is provided on both lateral sides with barbed flanks which extend at least partially laterally away from the open window.
• the distance between the most lateral ends of the two barbed flanks is greater than the smallest distance between the two side flanks of the apertures, wherein the barbed flanks are flexibly movable towards each other to a position where both barbed flanks can be brought past the side flanks of the apertures.
• the airflow directing elements, preferably the chamber are provided with obstructors, the obstructors being configured to obstruct passage for the airflow directing elements through the aperture.
• the obstructors and the barbed flanks are configured so as to not allow the barbed flanks to extend above the plane of the holder plate when the air flow directing element is placed in the aperture with the obstructor at the rear of the holder plate and the barbed flanks above the side flanks.
• the airflow directing elements preferably the chamber, are longer along the longitudinal axis than the apertures by means of the obstructors, which obstructors are provided at both longitudinal ends of the airflow directing elements.
• the most lateral ends of the barbed flanks are tapered, preferably with the lateral ends of the barbed flanks being flattened at the top, and with further preference with the flattened lateral ends being substantially coplanar.
• Figure 1A shows a (transverse) section or profile of a chamber according to an embodiment of the invention.
• Figures 1B-C show perspective views of a chamber according to an embodiment of the invention.
• Figure 2A shows a (transverse) section or profile of an air deflector according to an embodiment of the invention.
• FIGS 2B-C show perspective views of an air deflector according to an embodiment of the invention.
• Figure 3 shows a top view of a holder plate with apertures according to an embodiment of the invention.
• 'a' and 'the' refer to both the singular and the plural, unless the context presupposes otherwise.
• 'a segment' means one or more segments.
• 'flexible' or 'pliable' refers to a degree of flexibility of an element or component, and specifically to an elasticity in deformation under the influence of a force, with a return to the original shape when the force ceases.
• An example of this are so-called snap-fit connections.
• Quoting numerical intervals by endpoints comprises all integers, fractions and/or real numbers between the endpoints, these endpoints included.
• the invention relates to an improved swirl diffuser according to claim 1.
• the swirl diffuser comprises a substantially flat holder plate and a plurality of airflow directing elements.
• the holder plate is provided with a plurality of substantially rectangular apertures.
• at least a portion (25%, 50%, 75% or more) of the apertures extend radially into the holder plate relative to a central point or zone.
• the apertures are provided on both longitudinal sides with side flanks extending partially inwardly into the aperture, which side flanks are located at least partially posterior to the plane of the holder plate, and located at least partially in a half-space (defined by the plane of the holder plate) at the rear of the plane of the holder plate, preferably wherein the free ends of the side flanks are located at the rear side of the holder plate.
• the airflow directing elements each comprise a longitudinal chamber (also known as drum housing) and an air deflector (also known as drum), the air deflector being mounted rotatably about a longitudinal rotational axis in the chamber, the chamber comprising an open window through the chamber, the open window spanning substantially the entire longitudinal dimension of the chamber.
• the air deflector in the chamber is adapted to substantially completely close the open window in a first position, and to leave the window at least partially open in a second position, the air deflector being rotatably adjustable between the first and second positions.
• the airflow directing elements preferably the chamber, have a top side which is provided on both lateral sides with barbed flanks which extend at least partially laterally away from the open window.
• the distance between the most lateral ends of the two barbed flanks is greater than the smallest distance between the two side flanks of the apertures, wherein the barbed flanks are flexibly movable towards each other to a position where both barbed flanks can be brought past the side flanks of the apertures.
• the airflow directing elements, preferably the chamber are provided with obstructors, the obstructors being configured to obstruct passage for the airflow directing elements through the aperture.
• the obstructors and the barbed flanks are configured so as to not allow the barbed flanks to extend above the plane of the holder plate when the air flow directing element is placed in the aperture with the obstructor at the rear of the holder plate and the barbed flanks above the side flanks.
• a first advantage possible due to the side flanks projecting to the rear of the holder plate, is making the swirl diffuser 'flush'. This means that no elements protrude from the plane of the holder plate, which is the case in the existing slot diffusers, usually due to the clamping of the airflow directing elements, which are attached to both sides of the holder plate, often via a snap-fit connection. This ensures that there is a 'threshold' on the front of the holder plate (visible side), which has a very large, negative impact on the operation of the Coanda effect.
• the airflow does not run perfectly along the plane of the holder plate, but is slightly elevated relative to it, allowing some of the airflow to detach from the wall, and typically quickly become turbulent. Once turbulent partial flows develop, this affects the laminar partial flow very quickly, so that a large part of the flow rate is used inefficiently.
• a second advantage is that the unevenness of the holder plate due to the unevenness mentioned above has a negative influence on the resistance of the swirl diffuser to the airflow, making the airflow on the one hand more energy-intensive compared to the result, but also more difficult to control (partly due to the discussed above Coanda effect being negatively impacted).
• a third advantage is that due to the fact that the holder plate is flush, no unwanted noises or whooshing occur. Such noise is typically the result of an airflow moving along irregularities on a smooth surface, and can be highly disruptive. With airflows with sufficient flow rate, and/or with a large number of swirl diffusers, this can lead to clearly audible whooshing or whistling.
• the present invention also ensures that the airflow directing elements cannot be easily removed.
• the elements can only be fitted and removed via the rear side of the holder plate. With holder plates already placed, it is therefore not possible to remove them without removing the holder plate from the ceiling, which prevents unwanted manipulations.
• the airflow directing elements preferably the chamber, are longer along the longitudinal axis than the apertures by means of the obstructors, which obstructors are provided at both longitudinal ends of the airflow directing elements.
• the extension, relative to the aperture, along the longitudinal side ensures that the airflow directing elements cannot be moved beyond the aperture once they are (correctly) placed therein.
• By providing the extension at the longitudinal ends it is possible to do this with a minimum amount of material (since it is added over a short side), but it is also more certain that the chamber cannot be deformed to a shorter length, since the rigidity of the chamber along the longitudinal axis is typically higher than laterally (see also the Figures).
• the barbed flanks are substantially the same length as the apertures. This ensures that when placed, the barbed flanks align as correctly and completely as possible with the side flanks of the aperture in which the airflow directing element is positioned, optimising the Coanda effect.
• the side flanks have a substantially flat top side, which top side extends into the aperture at an angle of at least 5°, preferably at least 20°, and at most 70°, preferably at most 50° to the rear of the holder plate, and wherein the underside of the barbed flanks extends laterally at the same angle as the angle of the top of the side flanks.
• the two barbed flanks of the chambers extend symmetrically on either side, and the extensions of the tops (i.e. the visible side when installed) of the two barbed flanks of a chamber intersect at an angle comprised between 90° and 170° preferably between 100° and 160°, more preferably between 110° and 150°, still further preferably between 120° and 140° and most preferably between 125° and 135°.
• This means that the tops of the barbed flanks are at an angle of (180°-above angle)/2 to the plane of the holder plate when positioned in the aperture, i.e. comprised between 5° and 45°, preferably between 10° and 40°, further preferably between 15° and 35°, still further preferably between 20° and 30°, and still further preferably between 22.5° and 27.5°.
• the inner chamber has a smooth and curved surface, the inner side walls of the chamber being bent towards each other at the top, preferably following the curvature of a roll.
• the curved inner side of the side walls ends at an angle ends at an angle between 10° and 50° with respect to the holder plate, preferably between 15° and 45°, more preferably between 20° and 40°, still further preferably between 25° and 35° and still further preferably between 27.5° and 32.5°.
• This angle forms a very gradual transition to the angle of the top of the barbed flanks relative to the holder plate, whereby little or no negative influence is exerted on the airflow.
• the obstructors are provided at both longitudinal ends of the airflow directing elements, which obstructors are spaced from each other by a distance greater than the length of the apertures, and the obstructors and barbed flanks are not directly connected.
• the most lateral ends of the barbed flanks are tapered.
• the lateral ends of the barbed flanks are flattened at the top, and more preferably the flattened lateral ends lie substantially in the same plane.
• the barbed flanks may have a convex profile viewed from the centre of the airflow directing element to the distal end of the barbed flank.
• the barbed flanks in these embodiments gradually transition in angle, further aiding in optimising the Coanda effect.
• a steady transition ensures that the air flows continue to follow the surface as much as possible, which means that the splitting off of (turbulent) airflows is avoided.
• the airflow directing element is positioned in the aperture with the obstructor at the rear of the holder plate and the barbed flanks above the side flanks, the flattened lateral ends being substantially parallel to the top surface of the holder plate.
• the barbed flanks transition perfectly to the upper surface of the holder plate, so that the airflow is not hindered, and thus will follow the surface further.
• the obstructors are provided at both longitudinal ends of the airflow directing elements, the most lateral ends of the barbed flanks being at least at the same height as the obstructors, and maximally elevated above the obstructors by a distance equal to the thickness of the holder plate.
• Limiting height difference between the most lateral ends (which are the 'highest' parts of the airflow directing elements) and the top of the obstructors ensures that, when the airflow directing elements are placed in the apertures therefor, the airflow directing elements are at most level with the top surface of the holder plate.
• the most lateral ends of the barbed flanks are raised above the obstructors by a distance approximately equal to the thickness of the holder plate, which ensures that the transition to the holder plate is substantially continuous.
• the barbed flanks extend laterally from an upright side wall of the chamber, which side wall is bendable about the longitudinal axis of the chamber to allow the barbed flanks to be brought to the position where both barbed flanks can be arranged beyond the side flanks of the apertures.
• the upright side wall has a minimum height of 1.0 cm, more preferably at least 1.5 cm or even 2.0 cm, in order in this way to provide sufficient margin to elastically deform the side walls so that the barbed flanks can be pushed inwards, thereby passing the side flanks of the aperture.
• the air deflector in the second position is in the extension of one of the barbed flanks.
• the second position allows the most airflow through the airflow directing element.
• the air deflector is hereby positioned in the chamber to provide the largest possible (and as continuous as possible) cross-section over the path through the chamber for an airflow.
• the side flanks are integral with the holder plate, and are preferably curved partial cut-outs of the holder plate.
• the side flanks By manufacturing the side flanks in one piece with the rest of the holder plate, the production process is greatly simplified, since no separate process is required to make the holder plate and the side flanks and then connect them. In addition, this also ensures a reduction in material. In addition, such connections are often weak points, as well as visually undesirable. Finally, bending the side walls further ensures that the transition is continuous, unlike with external side walls that need to be attached (typically with seams, which have a negative impact on airflows).
• the air deflector has a substantially U-shaped profile longitudinally, the U-shaped profile extending from the axis of rotation in a half-space defined by a plane through the axis of rotation, preferably wherein the air deflector has three or more, with further preference disc-shaped ribs which are spread along the axis of rotation and perpendicular to the axis of rotation.
• the U-shaped profile provides an ideal deflector to achieve the two positions.
• a first position in which the U connects to the barbed flanks with two legs ensures that no more air can flow through the chamber.
• a second position, in which the U connects only one leg to one barbed flank, allows maximum flow.
• the symmetry of the barbed flanks, as well as the U-shaped profile allows the second position to be achieved in two ways (connection with one leg on one barbed flank, or with the other leg on the other barbed flank), and allows the airflow to be directed to the 'left' or the 'right' with no difference in effect or efficiency.
• the most lateral ends of the barbed flanks define a circumscribed rectangle substantially corresponding to the aperture of the holder plate, and wherein perpendicular projections of the obstructors to the plane in which said circumscribed rectangle lies are at least partially outside the circumscribed rectangle.
• the holder plate consists substantially of metal, preferably (galvanised) steel.
• the apertures (excluding side flanks) have a width of at least 1.5 cm, preferably 1.75 cm, further preferably 2.0 cm, still further preferably 2.25 cm, still further preferably 2.5 cm, still further preferably 2.75 cm and most preferably about 3.0 cm.
• the apertures (excluding side flanks) have a width of at most 7.5 cm, preferably 5.0 cm, further preferably 4.5 cm, still further preferably 4.0 cm, still further preferably 3.5 cm and most preferably about 3.0 cm.
• the apertures have a length of at least 5.0 cm, preferably 6.0 cm, further preferably 7.0 cm, still further preferably 7.5 cm, still further preferably 8.0 cm, still further preferably 8.5 cm and most preferably about 9.0 cm.
• the apertures have a length of at most 20.0 cm, preferably 15.0 cm, further preferably 12.5 cm, still further preferably 12.0 cm, still further preferably 11.5 cm, still further preferably 11.0 cm, still further preferably 10.5 cm and most preferably at most about 10.0 cm.
• the side flanks extend with respect to the holder plate through an angle of at least 10°, preferably at least 15°, further preferably at least 20°, still further preferably at least 25°, still further preferably at least 30° still further preferably at least 35°, still further preferably at least 40°, and most preferably about 45°.
• the side flanks extend with respect to the holder plate through an angle of at most 80°, preferably at least 75°, further preferably at least 70°, still further preferably at least 65°, still further preferably at least 60°, still further preferably at least 55°, still further preferably at least 50°, and most preferably about 45°.
• the side flanks are substantially trapezoidal.
• the side flanks are formed as isosceles trapeziums, further preferably wherein the side flanks at the major base of the trapezium are connected to the plate, and wherein the side flanks are angled with respect to the holder plate at said major base.
• the airflow directing elements consist substantially of plastic, preferably of propylene.
• the holder plate is substantially rectangular, preferably square.
• the holder plate comprises raised edges over the entire circumference.
• the holder plate except for the raised edges, is rectangular or square, and defines a thin beam with the raised edges.
• the raised edges are preferably at least 0.5 cm, more preferably 0.75 cm high, most preferably about 1.0 cm high, relative to the holder plate. These edges are suitable for connection to a plenum (e.g. via screw, bolt, nail, sealant, glue or other connecting means), and one or more of the raised edges may be provided with one or more apertures.
• the holder plate comprises one or more openings suitable for receiving a screw, bolt, nail or other connecting means.
• at least one such opening is provided centrally in the holder plate.
• one or more openings can also be provided in one or more corners of the holder plate.
• the minimum distance between the two barbed flanks is at least 0.75 cm, preferably at least 1.0 cm, more preferably at least 1.25 cm.
• the minimum distance is at most 3.0 cm, more preferably 2.5 cm, still further preferably at most 2.0 cm or even 1.75 or 1.5 cm.
• the chamber (or drum housing) is a one-piece element with two (parallel) upright, longitudinal side walls, which are (only) connected to each other at both longitudinal ends, wherein (only) the side walls at the bottom of the ends are connected to each other, so that the side walls at the top are substantially bendable (to allow them to be bent towards each other).
• the chamber is a substantially beam-shaped element, which is (preferably completely, in the sense that there is no bottom face) open at the bottom, and a longitudinally extending open window at the top (defined between the two barbed flanks).
• the side walls slope partially toward each other at the top, up to the barbed flanks, which extend away from each other from the top of the side walls.
• the side walls are connected at the longitudinal ends via a, preferably flat, U-shaped bridge element, the bridge elements preferably being open towards the underside of the chamber.
• the side walls are connected to the bridge element at the bottom of the chamber via an extension of the side wall.
• the bridge elements are each provided with a coupling element adapted to fix the air deflector rotatably (around the longitudinal axis of the chamber).
• the coupling element consists of two elastically deformable upright protrusions placed next to each other, with a C-shaped recess facing each other, in which a corresponding coupling element of the air deflector is received (in this case a cylindrical protrusion at both longitudinal ends of the air deflector).
• the coupling element of the chamber is U-shaped, the U-shaped coupling element of the chamber is located in the opening of the U-shaped bridge element, and the U-shaped coupling element of the chamber is open to the underside of the chamber, and wherein the distance between the legs of the U-shaped coupling element of the chamber has a local minimum.
• the obstructors comprise (or are) the bridge elements.
• the obstructors are provided on the bridge elements, at the 'base' of the U.
• the obstructor on the bridge element forms a flattened base for the U, which is substantially flat, and is perpendicular to the side walls.
• the air deflector comprises a substantially U-shaped profile extending across the longitudinal dimension.
• the air deflector comprises a coupling element, preferably a cylindrical protrusion along the longitudinal axis, at the longitudinal ends thereof, the coupling element extending along an axis passing through the base of the U-shaped profile.
• the air deflector comprises a plurality of (2, 3, 4, 5, 6 or more) ribs or wings perpendicular to the longitudinal dimension of the air deflector.
• the ribs are substantially disc-shaped, and extend from the rotational axis of the air deflector (i.e. the axis about which it rotates in the chamber).
• the disc-shaped ribs extend such that the U- shaped profile extends within the virtual cylinder defined by the ribs.
• the barbed flanks have a length of between 5.0 cm and 25.0 cm, preferably between 6.0 cm and 20.0 cm, more preferably between 7.0 cm and 15.0 cm, still further preferably between 7.5 cm and 12.5 cm.
• the ranges mentioned provide an ideal balance between strength and flexibility, and allow sufficient airflow to be generated with a limited number of 'extra' elements (instead of having to install successive elements).
• the obstructors are extensions relative to the length of the barbed flanks extending between 1.0 mm and 10.0 mm beyond the ends of the barbed flanks, preferably between 2.0 mm and 7.5 mm, more preferably between 3.0 mm and 5.0 mm.
• the chambers of the airflow directing elements have a height (distance bottom to top) comprising between 10 mm and 50 mm, preferably between 15 mm and 40 mm, further preferably between 20 mm and 35 mm, still further preferably between 25mm and 30mm.
• the chambers of the airflow directing elements have a width (lateral dimension) comprising between 10.0 mm and 50.0 mm, preferably between 15.0 mm and 45.0 mm, more preferably between 20.0 mm and 40.0 mm, still further preferably between 25.0 mm and 35.0 mm, and most preferably between 27.5 mm and 32.5 mm.
• the walls of the chamber have a thickness between 1.0 mm and 4.0 mm, preferably between 1.5 mm and 3.0 mm, and more preferably between 1.75 mm and 2.25 mm.
• Figures 1A-C show a possible embodiment of a chamber or drum housing (1).
• This comprises two upright side walls (7) which at the bottom end (14) are directed inwards towards each other.
• the side walls (7) also extend outwards at the bottom (further from the inwardly directed end of the side wall (14), via the barbed flanks (6) which hook behind the side flanks (5) of the holder plate (3).
• the profile of the chamber (1) is partially U-shaped, with an opening being provided centrally at the bottom.
• U-shaped bridge elements (8) are provided, which form an extension of the chamber (1) so that it is longer than apertures (4) in the holder plate (3), as seen in Figures 1B-C.
• the U-shaped bridge elements (8) have a flattened side or obstructor (coinciding partially or completely with the U-shaped bridge element), and in this case extend across the width of the chamber (although this is optional).
• the bridge elements (8) are connected to the chamber at the top of the chamber, and are separate from the chamber over a substantial part of the height from the bottom, allowing the side walls (7) of the chamber to be deformed (allowing them to be brought into the apertures), and this is not prevented by the obstructors.
• the bridge elements (8) extend upwards in legs (13) which are connected at the end thereof, at the top of the chamber, to the top of the side walls (7).
• the opposite bridge elements (8) are further provided with coupling elements (10), centrally between the two legs (13).
• These coupling elements (10) comprise two upright protrusions (11) with recesses (12) on the inward side of the protrusions, approximately C-shaped (although other shapes are also possible).
• the recesses allow coupling of a corresponding coupling element of an air deflector, so that it can rotate freely in the double C-shaped recesses (12).
• Figures 2A-C show a possible embodiment of an air deflector or drum (2). It is adapted to be able, in conjunction with a chamber (1), to close the longitudinal gap at the bottom of the chamber between the inwardly directed ends (14) of the side walls (7), and also, via rotation of the air deflector (2) to keep the gap open.
• the air deflector (2) comprises at its two longitudinal ends a coupling element (15) which can be coupled to the coupling elements (10) of the chamber (1) and allows rotation of the air deflector about its longitudinal axis.
• the air deflector (2) extends longitudinally, and has a U- shaped profile (16) - or C-shaped.
• the U-shaped profile is provided with a base that forms a semicircle, and is extended in the legs of the U.
• the air deflector is provided with a number (1, 2, 3, 4 or more) of disc-shaped ribs (17) for reinforcement, which may or may not be provided at regular intervals along the length of the air deflector.
• the air deflector is also provided with a discshaped rib (17) which ensures that air does not find its way through the chamber (1) along this path.
• One or more of the disc-shaped ribs (17) is provided with a positioning protrusion (18) which, when present on several ribs, align with each other along a straight line parallel to the longitudinal axis of the drum (2).
• the positioning protrusion (18) protrudes such that the drum (2), when positioned in the drum housing (1), causes a small resistance due to contact with the side walls (7) of the drum housing (1) and the drum (2) would be rotated from its 'closed' position beyond its 'open' position.
• Figure 3 shows a possible configuration of a holder plate (3) with rectangular apertures (4).
• This configuration is by no means limiting, and only an example, both in form, as well as in numbers, dimensions and proportions.
• the side flanks (5) on the aperture are visible on both longitudinal sides of the apertures (4).
• the mutual configuration of the apertures has no limitation, and can be in a (multiple) circular pattern, as in Figure 3.
• Figure 3 shows a double circular pattern, but 1, 3, 4 or more circles are also possible, depending on the needs of the situation.
• Grid arrangements are also possible with the apertures arranged in rows and/or columns, or staggered, as well as combinations of two or more of the aforementioned.

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• Engineering & Computer Science (AREA)
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Citations (5)

• 2020
  • 2020-09-29 BE BE20205669A patent/BE1028647B1/nl active IP Right Grant
• 2021
  • 2021-09-29 WO PCT/IB2021/058907 patent/WO2022070070A1/en active Application Filing

Patent Citations (5)

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