EP2757223B1 - A fresh air valve with a displaceable cover plate - Google Patents
A fresh air valve with a displaceable cover plate Download PDFInfo
- Publication number
- EP2757223B1 EP2757223B1 EP14151377.0A EP14151377A EP2757223B1 EP 2757223 B1 EP2757223 B1 EP 2757223B1 EP 14151377 A EP14151377 A EP 14151377A EP 2757223 B1 EP2757223 B1 EP 2757223B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cover plate
- fresh air
- outer shell
- air valve
- elongated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000001746 injection moulding Methods 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
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- 239000003365 glass fiber Substances 0.000 description 2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
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- 238000010924 continuous production Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
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Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B7/00—Special arrangements or measures in connection with doors or windows
- E06B7/02—Special arrangements or measures in connection with doors or windows for providing ventilation, e.g. through double windows; Arrangement of ventilation roses
Definitions
- the current invention relates to a fresh air valve which comprises an elongated housing with an elongated slot shaped through flow opening for building into elongated slot shaped openings in walls or frames, for example window frames, and an elongated cover plate which is displaceably arranged in the elongated housing to be displaceable between two positions, a closed position in which the through flow opening is closed and an open position in which the through flow opening is at least partially open.
- Fresh air valves of this kind are well known in the art. Some different examples are disclosed in DE20011184U1 , DK122840B , GB2311848B , US7393271B2 , WO9010777A1 , WO9735087A1 , EP1917483A1 and EP2231985A1 .
- the current invention seeks to provide a fresh air valve as mentioned in the opening paragraph but which has a cover plate which is strong and robust.
- the phrase "physically locks" should be understood in that the material of the outer shell is arranged to surround a portion of the stringer element so that it is not possible to remove the stringer element from the outer shell without destroying the outer shell.
- a solution where the stringer element can be unsnapped from the outer shell would not be considered to be included in the scope of this invention.
- the sealing bead could be co-extruded or co-pultruded together with the outer shell.
- Figures 1-15 are all related to the same embodiment of a fresh air valve, and as such the reference numerals used will be the same.
- Figures 16-18 relate to separate embodiments of a cover plate suitable for use with a fresh air valve.
- the first embodiment 1 of a fresh air valve according to the invention comprises an elongated housing 2, a cover plate 3, two push buttons 4,5, two springs 6,7 and two fastening clips 8,9.
- the fastening clips and the springs are of the kind which are known to the person skilled in the art and as such these will not be described in more detail in this specification.
- the fresh air valve is of the kind which can be mounted in an elongated slot in wall or frame.
- a slot is machined in a window frame and the fresh air valve is inserted in the slot by pressing it into the slot.
- the ends of the housing are semi-circular. This fits well with the fact that when machining a slot in a frame, it is typical to use a router with a circular cutter. Therefore, the start and end of the slot will be rounded. The rounded ends of the housing therefore match the rounded ends of the machined slot.
- a small overhang 20 on the top of the housing ensures that small manufacturing tolerances in the machining of the slot are covered by the fresh air valve.
- the clips 8,9 are arranged to grip onto the bottom and/or the sides of the housing and when the housing is pressed into the machined slot, the edges of the clips will dig into the sides of the slot, thereby holding the housing fixed in the machined slot.
- the width and length of the machined slot in the window frame are chosen to match the width and length of the housing.
- the fresh air valve fills the slot completely and a tight fit can be formed between the outer sides of the housing and the inner sides of the machined slot. This prevents unwanted air flow between the sides of the slot and the outer sides of the housing.
- the housing further comprises an elongated slot shaped through flow opening 21.
- the through flow opening in this embodiment is rectangular with a length which is greater than its width.
- the through flow opening has two end walls 22,23, one end wall arranged at each end of the through flow opening and two side walls 24,25, one side wall arranged along each longitudinal side of the through flow opening.
- the through flow opening allows air to flow through the housing when the through flow opening is not blocked.
- the through flow opening is arranged as an elongated channel having a length, a width and a depth, the length axis being parallel with the longitudinal axis of the elongated housing.
- the housing When built into a wall or frame, the area defined by the length and the width is the through flow area and the depth would be arranged perpendicular to the outer surface of the wall or frame.
- the housing further comprises two wells 26,27, one arranged at either end of the housing.
- the wells are arranged on the "outside" of the end walls of the through flow opening. By “outside” is meant further from the center of the housing.
- the push buttons 4,5 are arranged in these wells as will be described later on in this specification.
- a number of strengthening ribs 28 are provided in the through flow opening.
- the strengthening ribs 28 are connected to opposing side walls and are arranged perpendicular to the side walls. The ribs therefore span the through flow opening.
- a cover plate 3 is provided.
- the cover plate 3 is in the current embodiment arranged as a rectangular plate having dimensions so that it can block the through flow opening and block air flow through it.
- the cover plate is arranged such that it can assume at least two positions. In a first position, an open position, the cover plate is arranged so that air can flow through the through flow opening and in a second position, a closed position, the cover plate is arranged so that air cannot flow through the through flow opening.
- the cover plate could be arranged to fit inside the through flow opening like a plug and thereby block the air flow through it.
- the cover plate could be arranged slightly larger than the through flow opening like a cover over the through flow opening.
- the through flow opening is provided with a shoulder 30 onto which the cover plate can be fitted in the closed position of the cover plate. The dimension of the shoulder is arranged such that the cover plate can be pushed into the through flow opening, thereby allowing the top surface of the cover plate to be flush with the top surface of the housing.
- the cover plate is provided with a co-injected seal 31. More details of the seal 31 are provided later on in this specification.
- the seal 31 is arranged on the bottom surface of the cover plate and is arranged to press against the shoulder 30 in the through flow opening when the cover plate is in its closed position, thereby ensuring that an essentially air tight seal is provided between the housing and the cover plate.
- the cover plate is provided with an internal stringer 32 to provide extra stiffness. More details of the construction of the cover plate will be provided later on in this specification.
- locking mechanisms 40,50 are provided at each end of the housing which are engageable with engagement elements 41,51 arranged at either end of the cover plate.
- the engagement elements are provided on the bottom of the cover plate, whereby they are hidden from view when the cover plate is in its closed position.
- the engagement elements on the cover plate engage the locking mechanisms thereby holding the cover plate in place.
- the locking mechanisms are unlocked thereby releasing the engagement elements of the cover plate and allowing the cover plate to displace into its open position due to the bias of the springs.
- the locking mechanisms are independent of each other. As such one of the locking mechanisms could be unlocked while the other one was locked. This allows the cover plate to assume a position where it is partially closed and arranged diagonally in the opening. This also means that in order to close the cover plate, one could either press both ends of the cover plate to simultaneously engage both sides of the cover plate with the locking mechanisms at both ends of the housing which requires two hands or one could first press one end of the cover plate thereby engaging that end of the cover plate with the locking mechanism at one end of the housing then one could press the cover plate at the other end, thereby engaging that end of the cover plate with the locking mechanism at the other end of the housing.
- each side of the cover plate can assume one of two stable positions.
- the first position is completely open, the other is completely closed.
- the locking mechanism could be arranged to allow the ends of the cover plate to assume a number of different positions, for example, by providing the locking mechanism or the engagement elements with a ratchet type mechanism. This would provide a fresh air valve where the air flow through the valve could be controlled more precisely.
- the engagement element 41 is in the form of a "hook" projecting from the bottom of the cover plate element.
- the hook comprises a first elongated flexible portion protruding from the bottom of the cover plate. At the end of this flexible portion, a protrusion is formed.
- the hook could also be described as a leg or an L shaped member.
- the locking mechanism is in the current embodiment in the form of a plastic injection moulded push button 4, or activation element, arranged displaceably in the well 26 of the housing 2.
- the push button is arranged to be displaceable along an axis which is essentially parallel to the airflow through the through flow opening. It could also be said that the push button is arranged to be displaceable along an axis which is perpendicular to the cross sectional area of the through flow opening.
- the push button comprises two “legs" 42, 43 extending from the bottom of the push button.
- Each leg is formed as an elongated flexible protrusion protruding from the bottom of the push button.
- One leg 42 is arranged with a protrusion 44 which extends out through a small opening 45 in the end wall 22 of the through flow opening.
- the leg 42 is however arranged to be flexible and by bending the leg 42, the protrusion 44 can be retracted from the small opening 45.
- the bottom surface of the protrusion is formed with a sloped surface 46 which is in contact with an edge of the small opening 45 in the end wall 22.
- the protrusion Due to the sloped surface of the protrusion, when the push button is pressed down into the well, the protrusion is forced to retract from the small opening, thereby causing the leg 42 to bend. When the push button is released, the stiffness of the leg 42 causes the leg to want to return to its normal position, thereby causing the protrusion to again extend out through the small opening and thereby the push button moves up again due to the sloped surface.
- the bottom surface 47 of the engagement element is also formed with a sloped bottom. In this way, when the engagement element is pushed downwards and the bottom surface of the engagement element meets an edge, the edge is either forced to the left (according to the orientation in the figures) or the engagement element is forced to the right. This situation is shown in figure 9 .
- Figures 9-11 also show the second leg 43.
- the second leg is also formed as a hook element.
- the hook element of the second leg allows the push button to be inserted into the well and then the hook element of the second leg engages with a slot 48.
- the hook element of the second leg slides up and down in the slot 48, but the hook element prevents the push button from moving too far up and falling out of the well.
- the push button is also formed with two guiding legs 49 (not shown in figures 9-11 , but shown in figures 4 and 5 ).
- the two guiding legs are arranged perpendicular to the upper surface of the push button and are arranged in slots 50 in the well. The slots and the guiding legs ensure that the push button moves up and down in the well.
- the figures show one specific embodiment of a locking mechanism.
- the locking mechanism could perform the same function but have a different form.
- the guiding legs have the function of ensuring that the push button slides up and down along a well defined path.
- the second leg 43 can be said to have the function to ensure that the push button does not fall out of the well and has a well defined top position.
- the first leg 42 has the function of guiding the protrusion in and out of the small opening. Therefore, the locking mechanism can be said to have three main functions, a guiding function, a top position defining function and a protrusion moving function. These three functions could be arranged with other physical means than the ones used in the shown embodiment.
- Figure 9 shows what happens when the cover plate is moved from its open position to its closed position.
- the bottom surface 47 of the engagement element comes into contact with the top edge of the protrusion 44.
- the protrusion 44 is pushed further into the small opening 45.
- the engagement element 41 may also be pushed to the right, an amount depending on the strength difference between the first leg 42 of the push button and engagement element 41.
- Figure 11 shows what happens when the push button is pushed into the well when the cover plate is in its closed position.
- the sloped surface 46 of the protrusion 44 is pushed against the edge of the small opening 45. This forces the protrusion to retract into the well.
- the engagement element will release the protrusion, and the cover plate will be forced outwards into its open position due to the bias of the springs.
- two stabilizing elements 60 are arranged at each end of the cover plate. These stabilizing elements are also in the form of a hook and hook onto the bottom surface 61 of the shoulder 30 of the through flow opening in the open position of the cover plate.
- the bottom surface 61 can be seen in figures 9-11 . Since there are two stabilizing elements at each end of the cover plate, one at each corner, the stabilizing elements help to prevent the cover plate from twisting in the opening.
- the engagement elements arranged on the bottom surface of the cover plate are arranged inside the through flow opening, while the locking mechanisms are arranged on the outside of the through flow opening. In this way, the locking mechanisms are kept separate from the through flow opening. The interaction between the locking mechanisms and the engagement elements occurs via the small openings in the end walls.
- Figures 12-15 show more details of the cover plate 3 of the fresh air valve shown in figures 1-11 .
- the cover plate is manufactured via an injection moulding process out of a plastic material.
- an aluminium stringer 32 is provided inside the cover plate 3.
- the cover plate comprises an outer shell 33 and a stringer element 32 enveloped inside the outer shell 33.
- the material of the outer shell 33 is arranged to physically lock the stringer element to the outer shell, thereby ensuring that the cover plate feels like a single integrated element which does not need to be manually assembled and which cannot fall apart.
- the outer shell almost completely surrounds the stringer element so that only a very small percentage of the outer surface of the stringer element is exposed.
- the aluminium stringer 32 is arranged inside the empty mould and held in place in the correct position. Plastic material is then injected into the mould, thereby surrounding or enveloping the aluminium stringer with plastic. During the injection moulding process, the aluminium stringer is held in place by support elements in the mould. These support elements occupy space in the mould, and the plastic cannot fill the space occupied by the support elements. This can be seen by the grooves 34 in the cover plate. In this way, a small amount of the outer surface area of the stringer element is exposed after the injection moulding process is completed.
- the cover plate also comprises a seal 31 arranged around the periphery of the cover plate.
- This seal could be arranged in different ways, but is in the current embodiment formed during the injection moulding of the cover plate in the same mould.
- the mould is a two position mould, where in a first position, the outer shell of the cover plate itself is moulded by injecting a hard plastic into the mould cavity. Once the plastic material of the cover plate is sufficiently cooled, the mould is put into its second position whereby a new cavity is formed into which a second plastic material is injected. This second plastic material could be softer than the first plastic material and is suitable for forming a seal. Since the seal is formed during the injection moulding of the cover plate, no assembly is required for the cover plate.
- the cover plate comes out of the mould completely assembled. Also the engagement elements 41 and the stabilizing elements 60 are injection moulded in the current embodiment, again in the same mould as the outer shell of the cover plate. In this way, a cover plate is provided which is a very simple and robust part.
- the cover plate is manufactured with a single aluminium stringer 32 having a T shaped cross section.
- the cover plate could be arranged with different forms of stringers.
- the stringer could be manufactured from a fibre reinforced composite material, for example pultruded polyurethane with a high composition of glass fibres.
- two separate L shaped stringers could be arranged in the cover plate. Many other forms of stringers could be imagined which increase the stiffness of the cover plate.
- the cover plate is formed as a plastic injection moulded component with integrated engagement elements and stabilizing elements.
- the cover plate could be formed via an extrusion or pultrusion process, where the body of the cover plate is formed via the extrusion or pultrusion process and the engagement elements and/or stabilizing elements are fastened to the cover plate after the extrusion/pultrusion process.
- the seal could be formed as a co-extruded component along the sides of the cover plate. A seal for the ends of the cover plate could be fastened to the cover plate when the fastening and/or stabilizing elements are fastened to the cover plate.
- Figure 16 shows a second embodiment 100 of a cover plate according to the invention.
- the stringer element 101 is made from an aluminium material and the outer shell 102 is manufactured from a plastic material injection moulded around the stringer element.
- the stringer element is inserted into the empty mould and held in place. Plastic is then injected into the mould.
- the stringer element is formed as a T channel.
- the stringer element is formed with openings 103 spaced at regular intervals in the base of the stringer element.
- a groove 104 is provided in the outer periphery of the outer shell and an o-ring 105 is arranged in the groove. Furthermore, in this embodiment, the stringer element forms the outer surface of the cover plate. Therefore, the material of the stringer element is visible from the outside of the fresh air valve.
- Figure 17 shows another embodiment 110 of a cover plate according to the current invention.
- the stringer element 111 is formed as a pultruded glassfiber reinforced element.
- the outer shell 112 is again injection moulded around the stringer element.
- the bottom of the stringer element 111 is formed with a strong center section 113 which provides stiffness to the cover plate and two hooks 114 to engage the material of the outer shell effectively.
- the majority of the outer surface of the stringer element is exposed.
- the outer shell "wraps" slightly around the top edge of the stringer element in order to more effectively hold the stringer element and the outer shell together.
- a seal 115 is co-injected into the mould after the outer shell is formed.
- Figure 18 shows a fourth embodiment 120 of a cover plate according to the current invention.
- This embodiment is very similar to the first embodiment.
- a hollow circular element 121 is used as a stringer element.
- the stringer element is made from a carbon fibre tube. The ends of the tube are plugged before injection moulding so that plastic does not enter the hollow portion of the tube.
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- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Valve Housings (AREA)
- Self-Closing Valves And Venting Or Aerating Valves (AREA)
- Check Valves (AREA)
Description
- The current invention relates to a fresh air valve which comprises an elongated housing with an elongated slot shaped through flow opening for building into elongated slot shaped openings in walls or frames, for example window frames, and an elongated cover plate which is displaceably arranged in the elongated housing to be displaceable between two positions, a closed position in which the through flow opening is closed and an open position in which the through flow opening is at least partially open.
- Fresh air valves of this kind are well known in the art. Some different examples are disclosed in
DE20011184U1 ,DK122840B GB2311848B US7393271B2 ,WO9010777A1 WO9735087A1 EP1917483A1 andEP2231985A1 . - These prior art documents all disclose fresh air valves having various disadvantages. For example, some of the valves disclose a complicated and fragile locking mechanism. Others disclose a locking mechanism which is difficult to assemble. Others disclose a locking mechanism which is prone to getting jammed with dirt over time. Others disclose an expensive construction of the cover plate. Others disclose a complicated seal arrangement between the housing and the cover plate. Others are prone to condensation problems due to the poor insulating abilities of the cover plate.
- The current invention seeks to provide a fresh air valve as mentioned in the opening paragraph but which has a cover plate which is strong and robust.
- This is provided via the features disclosed in the characterizing portion of
claim 1. In this way, a strong and robust cover plate is provided. - It should be noted that the phrase "physically locks" should be understood in that the material of the outer shell is arranged to surround a portion of the stringer element so that it is not possible to remove the stringer element from the outer shell without destroying the outer shell. For example a solution where the stringer element can be unsnapped from the outer shell would not be considered to be included in the scope of this invention.
- Additional advantageous features are described in the dependent claims. In one embodiment, the sealing bead could be co-extruded or co-pultruded together with the outer shell.
- It should be emphasized that the term "comprises/comprising/comprised of" when used in this specification is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.
- In the following, the invention will be described in greater detail with reference to embodiments shown by the enclosed figures. It should be emphasized that the embodiments shown are used for example purposes only and should not be used to limit the scope of the invention.
-
Figure 1 shows a top perspective view of a first embodiment of a fresh air valve according to the invention, where the cover plate is in its open position. -
Figure 2 shows a top perspective view of the fresh air valve offigure 1 with the cover plate in its closed position. -
Figure 3 shows a cross section view of the fresh air valve offigure 1 according to the line III-III defined infigure 1 . -
Figure 4 shows a top perspective exploded view of the fresh air valve offigure 1 . -
Figure 5 shows a top perspective detail exploded view of one end of the fresh air valve offigure 1 . -
Figure 6 shows a close-up perspective view of the push button of the locking mechanism of the fresh air valve offigure 1 . -
Figure 7 shows a bottom perspective view of the fresh air valve offigure 1 . -
Figure 8 shows a top view of the fresh air valve offigure 1 . -
Figures 9-11 schematically show the function of the locking mechanism of the fresh air valve offigure 1 . -
Figure 12 shows a bottom perspective view of the cover plate of the fresh air valve offigure 1 . -
Figure 13 shows a cross section view of the cover plate offigure 12 according to the line XIII-XIII defined infigure 12 . -
Figure 14 shows a top perspective view of the cover plate offigure 12 . -
Figure 15 shows a cross section view of the cover plate offigure 12 according to the line XV-XV defined infigure 12 . -
Figure 16 schematically shows a cross section view of a second embodiment of a cover plate. -
Figure 17 schematically shows a cross section view of a third embodiment of a cover plate. -
Figure 18 schematically shows a cross section view of a fourth embodiment of a cover plate. -
Figures 1-15 are all related to the same embodiment of a fresh air valve, and as such the reference numerals used will be the same.Figures 16-18 relate to separate embodiments of a cover plate suitable for use with a fresh air valve. - The
first embodiment 1 of a fresh air valve according to the invention comprises anelongated housing 2, acover plate 3, twopush buttons springs fastening clips - The fresh air valve is of the kind which can be mounted in an elongated slot in wall or frame. One typical example of the use of such a valve is in a window frame. Typically, a slot is machined in a window frame and the fresh air valve is inserted in the slot by pressing it into the slot. It can be see that the ends of the housing are semi-circular. This fits well with the fact that when machining a slot in a frame, it is typical to use a router with a circular cutter. Therefore, the start and end of the slot will be rounded. The rounded ends of the housing therefore match the rounded ends of the machined slot. A
small overhang 20 on the top of the housing ensures that small manufacturing tolerances in the machining of the slot are covered by the fresh air valve. Theclips - Furthermore, the width and length of the machined slot in the window frame are chosen to match the width and length of the housing. In this way, the fresh air valve fills the slot completely and a tight fit can be formed between the outer sides of the housing and the inner sides of the machined slot. This prevents unwanted air flow between the sides of the slot and the outer sides of the housing. In certain cases, it might be desired to apply a seal between the outer side of the housing and the inner sides of the slot.
- The housing further comprises an elongated slot shaped through flow opening 21. The through flow opening in this embodiment is rectangular with a length which is greater than its width. The through flow opening has two
end walls side walls wells push buttons ribs 28 are provided in the through flow opening. The strengtheningribs 28 are connected to opposing side walls and are arranged perpendicular to the side walls. The ribs therefore span the through flow opening. - In order to prevent airflow through the through flow opening when desired, a
cover plate 3 is provided. Thecover plate 3 is in the current embodiment arranged as a rectangular plate having dimensions so that it can block the through flow opening and block air flow through it. The cover plate is arranged such that it can assume at least two positions. In a first position, an open position, the cover plate is arranged so that air can flow through the through flow opening and in a second position, a closed position, the cover plate is arranged so that air cannot flow through the through flow opening. - In one embodiment, the cover plate could be arranged to fit inside the through flow opening like a plug and thereby block the air flow through it. In another embodiment, the cover plate could be arranged slightly larger than the through flow opening like a cover over the through flow opening. In the current embodiment, the through flow opening is provided with a
shoulder 30 onto which the cover plate can be fitted in the closed position of the cover plate. The dimension of the shoulder is arranged such that the cover plate can be pushed into the through flow opening, thereby allowing the top surface of the cover plate to be flush with the top surface of the housing. - As can best be seen in
figure 3 , the cover plate is provided with aco-injected seal 31. More details of theseal 31 are provided later on in this specification. Theseal 31 is arranged on the bottom surface of the cover plate and is arranged to press against theshoulder 30 in the through flow opening when the cover plate is in its closed position, thereby ensuring that an essentially air tight seal is provided between the housing and the cover plate. Furthermore, as can best be seen infigure 3 , the cover plate is provided with aninternal stringer 32 to provide extra stiffness. More details of the construction of the cover plate will be provided later on in this specification. -
Springs - In order to hold the cover plate in its closed position, locking
mechanisms engagement elements 41,51 arranged at either end of the cover plate. In the current embodiment the engagement elements are provided on the bottom of the cover plate, whereby they are hidden from view when the cover plate is in its closed position. When the cover plate is pressed into its closed position, the engagement elements on the cover plate, engage the locking mechanisms thereby holding the cover plate in place. When it is desired to open the cover plate, the locking mechanisms are unlocked thereby releasing the engagement elements of the cover plate and allowing the cover plate to displace into its open position due to the bias of the springs. - In the current embodiment, the locking mechanisms are independent of each other. As such one of the locking mechanisms could be unlocked while the other one was locked. This allows the cover plate to assume a position where it is partially closed and arranged diagonally in the opening. This also means that in order to close the cover plate, one could either press both ends of the cover plate to simultaneously engage both sides of the cover plate with the locking mechanisms at both ends of the housing which requires two hands or one could first press one end of the cover plate thereby engaging that end of the cover plate with the locking mechanism at one end of the housing then one could press the cover plate at the other end, thereby engaging that end of the cover plate with the locking mechanism at the other end of the housing.
- In the current embodiment, it can also be noted that each side of the cover plate can assume one of two stable positions. The first position is completely open, the other is completely closed. In another embodiment (not shown) the locking mechanism could be arranged to allow the ends of the cover plate to assume a number of different positions, for example, by providing the locking mechanism or the engagement elements with a ratchet type mechanism. This would provide a fresh air valve where the air flow through the valve could be controlled more precisely.
- The locking mechanism and the engagement element will now be described in more detail. The function of the locking mechanism can best be explained with reference to
figures 9-11 . For the sake of simplicity, only the locking mechanism and engagement element at the left side of the fresh air valve as shown in the figures will be discussed. However, the locking mechanism and the engagement element at the right side of the fresh air valve are identical. - The
engagement element 41 is in the form of a "hook" projecting from the bottom of the cover plate element. The hook comprises a first elongated flexible portion protruding from the bottom of the cover plate. At the end of this flexible portion, a protrusion is formed. The hook could also be described as a leg or an L shaped member. The locking mechanism is in the current embodiment in the form of a plastic injection mouldedpush button 4, or activation element, arranged displaceably in the well 26 of thehousing 2. The push button is arranged to be displaceable along an axis which is essentially parallel to the airflow through the through flow opening. It could also be said that the push button is arranged to be displaceable along an axis which is perpendicular to the cross sectional area of the through flow opening. - In
figures 9-11 , it can be seen that the push button comprises two "legs" 42, 43 extending from the bottom of the push button. Each leg is formed as an elongated flexible protrusion protruding from the bottom of the push button. Oneleg 42 is arranged with aprotrusion 44 which extends out through asmall opening 45 in theend wall 22 of the through flow opening. Theleg 42 is however arranged to be flexible and by bending theleg 42, theprotrusion 44 can be retracted from thesmall opening 45. As can be seen infigures 9-11 , the bottom surface of the protrusion is formed with asloped surface 46 which is in contact with an edge of thesmall opening 45 in theend wall 22. Due to the sloped surface of the protrusion, when the push button is pressed down into the well, the protrusion is forced to retract from the small opening, thereby causing theleg 42 to bend. When the push button is released, the stiffness of theleg 42 causes the leg to want to return to its normal position, thereby causing the protrusion to again extend out through the small opening and thereby the push button moves up again due to the sloped surface. - As can also be seen from
figures 9-11 thebottom surface 47 of the engagement element is also formed with a sloped bottom. In this way, when the engagement element is pushed downwards and the bottom surface of the engagement element meets an edge, the edge is either forced to the left (according to the orientation in the figures) or the engagement element is forced to the right. This situation is shown infigure 9 . -
Figures 9-11 also show thesecond leg 43. The second leg is also formed as a hook element. The hook element of the second leg, allows the push button to be inserted into the well and then the hook element of the second leg engages with aslot 48. When the push button moves up and down in the well, the hook element of the second leg slides up and down in theslot 48, but the hook element prevents the push button from moving too far up and falling out of the well. The push button is also formed with two guiding legs 49 (not shown infigures 9-11 , but shown infigures 4 and 5 ). The two guiding legs are arranged perpendicular to the upper surface of the push button and are arranged inslots 50 in the well. The slots and the guiding legs ensure that the push button moves up and down in the well. - In general, the figures show one specific embodiment of a locking mechanism. However, it should be clear to the person skilled in the art that the locking mechanism could perform the same function but have a different form. For example, in the current embodiment, the guiding legs have the function of ensuring that the push button slides up and down along a well defined path. The
second leg 43 can be said to have the function to ensure that the push button does not fall out of the well and has a well defined top position. Thefirst leg 42 has the function of guiding the protrusion in and out of the small opening. Therefore, the locking mechanism can be said to have three main functions, a guiding function, a top position defining function and a protrusion moving function. These three functions could be arranged with other physical means than the ones used in the shown embodiment. -
Figure 9 shows what happens when the cover plate is moved from its open position to its closed position. As the cover plate is pushed down into the housing, thebottom surface 47 of the engagement element comes into contact with the top edge of theprotrusion 44. As the cover plate is pushed further down, theprotrusion 44 is pushed further into thesmall opening 45. Theengagement element 41 may also be pushed to the right, an amount depending on the strength difference between thefirst leg 42 of the push button andengagement element 41. Once the protrusion has been pushed all the way into the small opening, the engagement element can pass the protrusion. As soon as the engagement element has passed the protrusion, the protrusion snaps out again (as shown infigure 10 ) due to the elasticity of thefirst leg 42. The engagement element is then held in place by the protrusion and the cover plate kept in place in its closed position. -
Figure 11 shows what happens when the push button is pushed into the well when the cover plate is in its closed position. In this case, the slopedsurface 46 of theprotrusion 44 is pushed against the edge of thesmall opening 45. This forces the protrusion to retract into the well. Once the protrusion is retracted enough, the engagement element will release the protrusion, and the cover plate will be forced outwards into its open position due to the bias of the springs. - In order to ensure that the cover plate does not fall out of the housing, two stabilizing
elements 60 are arranged at each end of the cover plate. These stabilizing elements are also in the form of a hook and hook onto thebottom surface 61 of theshoulder 30 of the through flow opening in the open position of the cover plate. Thebottom surface 61 can be seen infigures 9-11 . Since there are two stabilizing elements at each end of the cover plate, one at each corner, the stabilizing elements help to prevent the cover plate from twisting in the opening. - It should be noted that the engagement elements arranged on the bottom surface of the cover plate are arranged inside the through flow opening, while the locking mechanisms are arranged on the outside of the through flow opening. In this way, the locking mechanisms are kept separate from the through flow opening. The interaction between the locking mechanisms and the engagement elements occurs via the small openings in the end walls.
-
Figures 12-15 show more details of thecover plate 3 of the fresh air valve shown infigures 1-11 . As mentioned earlier in this specification, the cover plate is manufactured via an injection moulding process out of a plastic material. In order to give strength and stiffness to the cover plate, analuminium stringer 32 is provided inside thecover plate 3. It could be said that the cover plate comprises anouter shell 33 and astringer element 32 enveloped inside theouter shell 33. In particular, it can be said that the material of theouter shell 33 is arranged to physically lock the stringer element to the outer shell, thereby ensuring that the cover plate feels like a single integrated element which does not need to be manually assembled and which cannot fall apart. In the current embodiment the outer shell almost completely surrounds the stringer element so that only a very small percentage of the outer surface of the stringer element is exposed. - During manufacturing, the
aluminium stringer 32 is arranged inside the empty mould and held in place in the correct position. Plastic material is then injected into the mould, thereby surrounding or enveloping the aluminium stringer with plastic. During the injection moulding process, the aluminium stringer is held in place by support elements in the mould. These support elements occupy space in the mould, and the plastic cannot fill the space occupied by the support elements. This can be seen by thegrooves 34 in the cover plate. In this way, a small amount of the outer surface area of the stringer element is exposed after the injection moulding process is completed. - Furthermore, as mentioned previously, the cover plate also comprises a
seal 31 arranged around the periphery of the cover plate. This seal could be arranged in different ways, but is in the current embodiment formed during the injection moulding of the cover plate in the same mould. The mould is a two position mould, where in a first position, the outer shell of the cover plate itself is moulded by injecting a hard plastic into the mould cavity. Once the plastic material of the cover plate is sufficiently cooled, the mould is put into its second position whereby a new cavity is formed into which a second plastic material is injected. This second plastic material could be softer than the first plastic material and is suitable for forming a seal. Since the seal is formed during the injection moulding of the cover plate, no assembly is required for the cover plate. The cover plate comes out of the mould completely assembled. Also theengagement elements 41 and the stabilizingelements 60 are injection moulded in the current embodiment, again in the same mould as the outer shell of the cover plate. In this way, a cover plate is provided which is a very simple and robust part. - In the current embodiment, the cover plate is manufactured with a
single aluminium stringer 32 having a T shaped cross section. However, within the scope of the current invention, the cover plate could be arranged with different forms of stringers. For example, in one embodiment, not shown, the stringer could be manufactured from a fibre reinforced composite material, for example pultruded polyurethane with a high composition of glass fibres. In another embodiment, not shown, instead of a single T shaped stringer, two separate L shaped stringers could be arranged in the cover plate. Many other forms of stringers could be imagined which increase the stiffness of the cover plate. - Furthermore, in the current embodiment, the cover plate is formed as a plastic injection moulded component with integrated engagement elements and stabilizing elements. However, in another embodiment (not shown), the cover plate could be formed via an extrusion or pultrusion process, where the body of the cover plate is formed via the extrusion or pultrusion process and the engagement elements and/or stabilizing elements are fastened to the cover plate after the extrusion/pultrusion process. Furthermore, the seal could be formed as a co-extruded component along the sides of the cover plate. A seal for the ends of the cover plate could be fastened to the cover plate when the fastening and/or stabilizing elements are fastened to the cover plate.
- Furthermore, in one embodiment, one could imagine a process where in a first part of the process, a stringer element was extruded. The extruded stringer element was then fed directly into an extrusion or pultrusion apparatus to form a moving core about which the outer shell is formed. This could be considered to be a process where the stringer element is formed "inline" with the manufacture of the cover plate. This is similar to the way electrical wires are coated with plastic coverings. In this way, one could provide for a continuous process where only raw material needs to be stored prior to the process and out of the process comes the finished cover plate.
-
Figure 16 shows asecond embodiment 100 of a cover plate according to the invention. In this embodiment, thestringer element 101 is made from an aluminium material and theouter shell 102 is manufactured from a plastic material injection moulded around the stringer element. As in the first embodiment, the stringer element is inserted into the empty mould and held in place. Plastic is then injected into the mould. As can be seen from the figures, the stringer element is formed as a T channel. Furthermore, the stringer element is formed withopenings 103 spaced at regular intervals in the base of the stringer element. When the plastic of theouter shell 102 is injected into the mould, the plastic flows through the openings and thereby locks the stringer element to the outer shell. In contrast to the other embodiments, agroove 104 is provided in the outer periphery of the outer shell and an o-ring 105 is arranged in the groove. Furthermore, in this embodiment, the stringer element forms the outer surface of the cover plate. Therefore, the material of the stringer element is visible from the outside of the fresh air valve. -
Figure 17 shows anotherembodiment 110 of a cover plate according to the current invention. In this embodiment thestringer element 111 is formed as a pultruded glassfiber reinforced element. Theouter shell 112 is again injection moulded around the stringer element. The bottom of thestringer element 111 is formed with astrong center section 113 which provides stiffness to the cover plate and twohooks 114 to engage the material of the outer shell effectively. Furthermore, it can be seen that the majority of the outer surface of the stringer element is exposed. Furthermore, it can be see that the outer shell "wraps" slightly around the top edge of the stringer element in order to more effectively hold the stringer element and the outer shell together. Aseal 115 is co-injected into the mould after the outer shell is formed. -
Figure 18 shows afourth embodiment 120 of a cover plate according to the current invention. This embodiment is very similar to the first embodiment. In contrast to the first embodiment which used a T shaped cross section, in this embodiment a hollowcircular element 121 is used as a stringer element. In this case, the stringer element is made from a carbon fibre tube. The ends of the tube are plugged before injection moulding so that plastic does not enter the hollow portion of the tube. - It is to be noted that some of the figures and the above description have shown the example embodiments in a simple and schematic manner. Certain mechanical details might have been removed since the person skilled in the art should be familiar with these details and they would just unnecessarily complicate this description and/or the figures. For example, in many of the figures, the
springs
Claims (15)
- A fresh air valve (1) which comprises- an elongated housing (2) with an elongated slot shaped through flow opening (21) for building into elongated slot shaped openings in walls or frames, for example window frames and- an elongated cover plate (3) which is displaceably arranged in the elongated housing to be displaceable between two positions, a closed position in which the through flow opening is closed and an open position in which the through flow opening is at least partially open
characterized in that the elongated cover plate comprises- an elongated stringer element (32) made from a first material and extending along the longitudinal axis of the elongated cover plate, and- an outer shell (33) comprising a material different from the first material,- said outer shell being arranged to envelope the stringer element within the outer shell such that the material of the outer shell physically locks the stringer to the outer shell, and- said first material having a higher modulus of elasticity than the material of the outer shell. - A fresh air valve (1) according to claim 1 characterized in that less than 10% of the outer surface area of the stringer element (32) is exposed.
- A fresh air valve (1) according to claim 2, characterized in that the outer surface area of the stringer element (32) which is exposed is located on the side of the cover plate (3) which is inside the housing (2) in the closed position of the cover plate.
- A fresh air valve (1) according to any one of claims 1-3, characterized in that the outer shell (33) is a single integrated element made from a single material.
- A fresh air valve (1) according to any one of claims 1-4, characterized in that the cover plate (3) is arranged such that the upper surface of the cover plate (3) is flush with the upper surface of the housing (2) in the closed position of the cover plate.
- A fresh air valve (1) according to any one of claims 1-5, characterized in that the top surface of the stringer element (32) is arranged closer towards the inside of the fresh air valve than the top surface of the outer shell (33).
- A fresh air valve according to any one of claims 1 to 6, characterized in that the top surface of the outer shell of the elongated cover plate is coated with a coating to change the visual impression of the elongated cover plate.
- A fresh air valve according to any one of claims 1 to 7, characterized in that the first material is aluminium or a fibre reinforced material and the material of the outer shell comprises a plastic material.
- A fresh air valve according to any one of claims 1 to 8, characterized in that the cover plate comprises two or more stringer elements.
- Process for producing a fresh air valve (1) according to any one of claims 1-9, characterized in that the outer shell (33) is manufactured via an injection moulding process and that the stringer element (32) is arranged within the mould before the material of the outer shell is injected into the mould.
- Process for producing a fresh air valve (1) according to claim 10, characterized in that the mould used in the manufacture of the cover plate (3) is a two position mould, whereby the material of the outer shell (33) is injected into the mould in its first position, after which the mould is moved into its second position and the material of the sealing bead (31) is injected into the mould into a cavity revealed due to the expansion of the mould.
- Process for producing a fresh air valve (1) according to claim 10 or 11, characterized in that engagement means (41) for engaging with a locking mechanism (40) of the fresh air valve are formed as an integrated part of the outer shell (33) of the elongated cover plate (3) during the injection moulding of the outer shell.
- Process for producing a fresh air valve according to any one of claims 1-9, characterized in that the outer shell is manufactured via an extrusion or a pultrusion process and where the stringer element is arranged as a moving core in the extrusion or pultrusion process and the cover plate is cut to the desired length after the extrusion or pultrusion process.
- Process for producing a fresh air valve according to claim 13, characterized in that the stringer element is manufactured via an extrusion process in line with the extrusion or pultrusion process which manufactures the outer shell.
- Process for producing a fresh air valve according to any one of claims 10-14 characterized in that a sealing bead (31) is co-formed with the outer shell (33) of the elongated cover plate in the same process in which the outer shell is formed and where the sealing bead is arranged along the sides of the elongated cover plate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL14151377T PL2757223T3 (en) | 2013-01-18 | 2014-01-16 | A fresh air valve with a displaceable cover plate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DKPA201370026 | 2013-01-18 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2757223A2 EP2757223A2 (en) | 2014-07-23 |
EP2757223A3 EP2757223A3 (en) | 2015-10-07 |
EP2757223B1 true EP2757223B1 (en) | 2019-08-07 |
Family
ID=49958288
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14151377.0A Active EP2757223B1 (en) | 2013-01-18 | 2014-01-16 | A fresh air valve with a displaceable cover plate |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2757223B1 (en) |
CN (1) | CN204040818U (en) |
DK (1) | DK2757223T3 (en) |
PL (1) | PL2757223T3 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2024158295A1 (en) * | 2023-01-25 | 2024-08-02 | La Leif Arvidsson Ab | Fresh air valve |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO119045B (en) | 1968-12-09 | 1970-03-16 | O Berg | |
DK119189A (en) | 1989-03-13 | 1990-09-14 | Mogens Madsen | DRAFT VALVE FOR DRAFT OPENINGS IN WALLS OR WINDOW FRAMES |
SE504904C2 (en) | 1996-03-18 | 1997-05-26 | Reton Ventilation Ab | Valve |
GB2311848B (en) | 1996-04-04 | 2000-04-12 | Titon Hardware | Slot ventilator |
DE20011184U1 (en) | 2000-07-03 | 2000-12-07 | Form & Plast A/S, Struer | Pressure operated start-up connection |
DK176163B1 (en) * | 2005-06-06 | 2006-10-23 | Form & Plast As | Vent |
US7393271B2 (en) | 2005-07-18 | 2008-07-01 | Enclos Corporation | Ventilator |
DK176947B1 (en) | 2007-12-03 | 2010-06-21 | Form & Plast As | Vent |
-
2014
- 2014-01-16 PL PL14151377T patent/PL2757223T3/en unknown
- 2014-01-16 DK DK14151377.0T patent/DK2757223T3/en active
- 2014-01-16 EP EP14151377.0A patent/EP2757223B1/en active Active
- 2014-01-20 CN CN201420035494.2U patent/CN204040818U/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
EP2757223A3 (en) | 2015-10-07 |
DK2757223T3 (en) | 2019-10-14 |
EP2757223A2 (en) | 2014-07-23 |
CN204040818U (en) | 2014-12-24 |
PL2757223T3 (en) | 2020-01-31 |
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