Patent Grant
11369976
The present disclosure relates generally to a latching mechanism for an air filter assembly. In particular, the present disclosure relates to securing multiple frames of the electrostatic air filter assembly together through the latching mechanism.
Indoor air includes small particles which, when inhaled, cause severe problems to human beings such as respiratory problems, allergies etc., and when just in the air, can damage machines and in particular, those with more sensitive electronics. In order to remove these particles, various types of air purifying devices or air filtration devices are used. One such air filtration device is an electrostatic air filtration device that uses electrostatic attraction to remove fine particulate matter such as dust and cigarette smoke from the air, such as may be seen in U.S. Pat. Nos. 3,209,074; 4,620,691; 4,628,386; 4,671,126; 4,790,259; 4,908,634; 5,184,706; 6,574,123; 7,686,869; 7,691,186; 7,708,813; 8,070,861; 8,252,095; 8,252,097; 8,795,601; 8,814,994; 9,764,331; 9,789,494; 9,861,990, and US Patent Application Publication 2016/0303499, the contents of which are incorporated by reference as if fully set forth herein. The electrostatic air filtration device may charge particles passing through the filter, which may encourage the particles to join with other charge particles, increasing their size, and making them easier to collect within a filter. To attract the charged particles, the electrostatic air filtration device comprises a collecting surface that may itself be charged, or it may be passive. After passing through the filter, air passing therethrough will contain fewer contaminants.
Conventionally, the electrostatic air filtration device may comprise filter media of filter material formed of a dielectric material. The filter media may be enclosed in frames and are locked/closed using latches that are pivotally attached to the frames. The latches extend around outer side edges of the frames. In a closed position, therefore, the latches extend beyond the edges of the frames and increase the width of the entire assembly. Because of this, the latches may catch during the installation and uninstallation of the filter assembly, causing damage not only to the frames, which are somewhat easier to fix or replace, but also frame housings, which are not. This damage can affect the filter's effectiveness as air may bypass damaged or misshapen filter elements, or it may even create damage to electrical connections and minimize or break them, rendering what was intended to be an electrostatic air filter, merely a passive one.
Thus, there exists a need for an improved latching mechanism for locking the frames of the electrostatic filter assembly.
It is an object of the present disclosure to provide an efficient, robust, and easy way to handle electrostatic air filter by using an improved latching mechanism that locks the frames without extending beyond edges of the frames of the electrostatic air filter assembly.
According to an aspect of the present disclosure, there is provided a filter assembly that may comprise a first frame and a second frame. The first frame and the second frame are connected by a hinge about which they rotate and hold a filter media there between. The filter assembly includes at least one latch located along a side rail of at least one of the first frame and the second frame. The at least one latch is flush with an edge of the side rails of the first frame and the second frame to couple the first frame and the second frame in a closed position.
According to another aspect of the present disclosure, there is provided a filter assembly that may comprise a first frame and a second frame. The first frame and the second frame are connected by a hinge about which they rotate and hold a filter media there between. The filter assembly includes at least one latch located along a side rail of at least one of the first frame and the second frame. The at least one latch is flush with an edge of the side rails of the first frame and the second frame to couple the first frame and the second frame in a closed position. The at least one latch is located at one or more corners of the side rail.
The technology of the present disclosure is a mechanism to improve catching issues during the installation and uninstallation of the electrostatic air filter assembly and thus increase robustness and ease of handling of the electrostatic air filter assembly.
The accompanying figures, where like reference numerals refer to identical or functionally similar elements throughout the separate views, together with the detailed description below, are incorporated in and form part of the specification, and serve to further illustrate embodiments of concepts that may include the claimed disclosure, and explain various principles and advantages of those embodiments.
Skilled artisans will appreciate that elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the dimensions of some of the elements in the figures may be exaggerated relative to other elements to help to improve understanding of embodiments of the present disclosure.
Hereinafter, the preferred embodiments of the present disclosure will be described in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.
The electrostatic air filter assembly 100 further may comprise a voltage supply 104 that may be located between the filter media 101 and the filter media 102. The voltage supply 104 may be located within a rectangular frame 105. The rectangular frame 105 may be smaller in size than the size of the filter media 101 and the filter media 102, such that the rectangular frame 105 may be easily clamped between the filter media 101 and the filter media 102. The rectangular frame 105 may be made of extruded aluminum onto which a charging screen 106 may be located. The charging screen 106 may be rectangular in shape. The charging screen 106 may have different structures, for example, a metal gauze, perforated metal sheet, a grill of wires, or a punched metal lattice.
The electrostatic air filter assembly 100 further may comprise two metal frames 112, which may be present to enclose the filter media 101, the filter media 102, and the rectangular frame 105. The two metal frames 112 may have similar characteristics, i.e., shape, size, material, etc. The two metal frames 112 may be larger in size than the size of the rectangular frame 105. The two metal frames 112 may be rectangular in shape. The two metal frames 112 act as housing or support to overall structure of the electrostatic air filter assembly 100. One of the two metal frames 112 acts as a first ground 108 for the electrostatic air filter assembly 100, and other of the two metal frames 112 may act as a second ground 110. The two metal frames 112 may be hinged at one edge such that the filter media 101, the filter media 102, and the rectangular frame 105 can be clamped between the two metal frames 112. The two metal frames 112 may surround one or more sides of rectangular wire meshes 114. The rectangular wire meshes 114 may be made of extruded aluminum. The rectangular wire meshes 114 may act as a support to the filter media 101 and the filter media 102. The filter media 101, the filter media 102, and the rectangular wire meshes 114 may be sized to ensure that the air sucked, inside the electrostatic air filter assembly 100, may pass through a first rectangular mesh of the rectangular wire meshes 114, through the filter media 101 and filter media 102, and further through a second rectangular mesh of the rectangular wire meshes 114.
The electrostatic air filter assembly 100 further may comprise an electrode 120 that may be placed above the filter media 102. The placement of the electrode 120 is such that the filter media 102 may fit between the electrode 120 and the rectangular wire meshes 114. A physical electrical contact is made between the electrode 120 and the charging screen 106, in order to charge particles of the air that entered the electrostatic air filtration assembly 100.
The electrostatic air filter assembly 100 further may comprise a high voltage power supply (not shown), which may be mounted in a channel 118 or be remote and run through wires in the channel. A transformer 126 may be used to supply power to the high voltage power supply. The high voltage power supply may provide a high voltage to electrode 120. The high voltage provided to the electrode 120 may charge the filter media 101 and filter media 102 of the electrostatic air filter assembly 100. The charging screen 106 may be provided to distribute charge to the filter media 101 and filter media 102.
The electrostatic air filter assembly 100 is closed and locked by the use of latches 122 and 124. The latches 122 and 124 are pivotably attached to one of the two metal frames 112. The latches 122 and 124 swing over the outside edges of both frames 112 to secure the resulting electrostatic air filtration assembly 100.
The electrostatic air filter assembly 200 may be closed and locked by the use of the latching mechanism that may include a plurality of latches 222. In another embodiment, the electrostatic air filter assembly 200 may include a single latch 222.
Each of the first frame 210 and the second frame 212 of the electrostatic air filter assembly 200 may comprise a side rail 213. In the present embodiment, the side rail 213 of a first frame 210 or a second frame 212 may comprise the latches 222. The latches 222 may be flush with an edge of the side rail 213 (as well as top rail or second portion 234) such that the latches 222, in the closed position, may be at a level similar to the edge of the side rail 213. Such an arrangement of the latches 222 being flush with the edge of the siderail 213, in the closed position, causes no increase in width of the assembly from the edge of the siderail 213. The flushing of the latches 222 may couple the first frame 210 and the second frame 212.
In the present embodiment, the side rail 213 may have a variable thickness. The side rail 213 may comprise a plurality of portions, i.e., a first portion 232, a second portion 234, and a third portion 236 along longitudinal direction of the side rail 213. The length of either the first portion 232 or the third portion 236 of the side rail 213 may be substantially equal to or at least slightly deeper than, the length of one of the latch tabs 238. The second portion 234 of the side rail 213 may be the remaining portion of the side rail 213, which is other than the first portion 232 and the third portion 236. The first portion 232 and/or the third portion 236 of the side rail 213 may have a first thickness that is less than a second thickness of the second portion 234 of the side rail 213. In order to attain the first thickness, an outer part of the side rail 213 is clipped from the first portion 232 and the third portion 236 of the side rail 213. Alternatively, the corners of the each frame 210, 212 may be molded pieces that engage the top and side rails 213, with male inserts inserted into hollow portions of each of the rails in a press=fit or adhesive engagement.
The latches 222 may be located at the first portion 232 and the third portion 236 of the side rail 213. The first portion 232 and/or the third portion 236 may be located at the corners of the side rail 213. Accordingly, the latches 222 may be located at the corners of the side rail 213. In an alternative embodiment, the latches 222 may be placed at the center or any other portion of the side rail 213, and the thickness of that portion may be varied accordingly.
The latches 222 may be located at the corners of the siderail 213 near a voltage input 203. The voltage input 203 may be provided through a channel 218. The channel 218 may be placed on one end of either of the first frame 210 or the second frame 212. The one end of either the first frame 210 or the second frame 212 may be opposite to the hinged end of the first frame 210 and the second frame 212. In an alternative embodiment, the latch 222 may be located at other portions that may be located away from the voltage input 203.
The latches 222 may be located at one or more corners/portions located on an edge of the first frame 210 and/or the second frame 212, which is different from the hinged edge of the first frame 210 and the second frame 212.
The latch 322 may include tabs 326, 326a (tab 326a is shown in phantom as it is engaged to frame 210 and cannot be seen from the view shown) to engage the first frame 210 and the second frame 212.
The first tab 238 and the second tab 240 may have different characteristics, i.e., size, shape, material, etc. The first tab 238 and the second tab 240 may be arc shaped. The first tab 238 may have a first arc length and the second tab 240 may have a second arc length. The first tab 238 and the second tab 240 may move in synchronization with each other, using the thumb tab 328. The first tab 238 and the second tab 240 may move in clockwise direction to switch from the closed position to the open position, and may move in counter clockwise direction to switch from the open position to the closed position. A person skilled in the art may understand that the first tab 238 and the second tab 240 may move in clockwise direction to switch from the open position to the closed position and may move in counter clockwise direction to switch from the closed position to the open position. According to an alternative embodiment, the first tab 238 and the second tab 240 may have similar characteristics, i.e., size, shape, material etc.
The tabs 326 may move in a hollow space of the side rail 313 of the first frame 210 and the second frame 212. The punch 330 comprised in the tabs 326 engages with the side rail 313. Either of the first tab 238 or the second tab 240 may comprise a punch.
The positioning of the latch 322 is such that it avoids any kind of catching issues during the installation and uninstallation of the latch 322, as there is no separate mechanism to extend the assembly's width involved in the electrostatic air filter assembly 200 to create such issues. The latch 322, in the closed position, is flush with the side rails 313. The flushing of the latch 322 may comprise levelling of the latch 322 with the side rail 313 such that the thumb tab 328 may be at a similar level with the side rail 313, in the closed position of the latch 322. Hence, no separate assembly for catching of the latch 322 is required. The positioning of the latch 322, when in closed position, is such that the total width of the electrostatic air filter assembly 200 is reduced as compared to the electrostatic air filter assembly, as shown in
The present latching mechanism may be implemented to any assembly, to lock structures/surfaces together within the assembly. The assembly may be, but is not limited to, appliances, automobile, household items etc. The assembly may comprise of one or more structures. The one or more structures may include a first structure and a second structure. The first structure and the second structure may be of any shape, size, and material etc. The first structure and the second structure may be connected by a hinge. The first structure and the second structure may rotate about the hinge.
The first structure and the second structure may be locked together with the help of at least one latch. The at least one latch may be located along an edge of at least one of the first structure and the second structure. The at least one latch is flush with the edge to couple the first structure and the second structure. The flushing of the at least one latch may couple the first structure and the second structure. The at least one latch in the closed position, is flushed with the edge, hence no separate assembly for catching of the at least one latch is required. The positioning of the at least one latch when in closed position, is such that the total width of the assembly is reduced. Further, use of the latch may not results in latch catching issues during the installation and uninstallation of the assembly.
In the foregoing specification, specific embodiments have been described. However, one of ordinary skill in the art appreciates that various modifications and changes can be made without departing from the scope of the disclosure as set forth in the claims below. Accordingly, the specification and figures are to be regarded in an illustrative rather than a restrictive sense, and all such modifications are intended to be included within the scope of present teachings.
The benefits, advantages, solutions to problems, and any element(s) that may cause any benefit, advantage, or solution to occur or become more pronounced are not to be construed as a critical, required, or essential features or elements of any or all the claims. The disclosure may be defined solely by the appended claims including any amendments made during the pendency of this application and all equivalents of those claims as issued.
Moreover in this document, relational terms such as first and second, top and bottom, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms “may comprise,” “comprising,” “has”, “having,” “includes”, “including,” “contains”, “containing” or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or article that may comprise, has, includes, contains a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, or article. An element proceeded by “may comprise . . . a”, “has . . . a”, “includes . . . a”, “contains . . . a” does not, without more constraints, preclude the existence of additional identical elements in the process, method, or article that may comprise, has, includes, contains the element. The terms “a” and “an” are defined as one or more unless explicitly stated otherwise herein. The terms “essentially”, “approximately”, “about” or any other version thereof, are defined as being close to as understood by one of ordinary skill in the art, and in one non-limiting embodiment the term is defined to be within 10%, in another embodiment within 5%, in another embodiment within 1% and in another embodiment within 0.5%. The term “coupled” as used herein is defined as connected, although not necessarily directly and not necessarily mechanically. A device or structure that is “configured” in a certain way is configured in at least that way, but may also be configured in ways that are not listed.
| Number | Name | Date | Kind |
|---|---|---|---|
| 690524 | Knight | Jan 1902 | A |
| 3209074 | French | Sep 1965 | A |
| 4549887 | Joannou | Oct 1985 | A |
| 4620691 | Waters, Jr. | Nov 1986 | A |
| 4628386 | Chabrolle | Dec 1986 | A |
| 4671126 | Sable | Jun 1987 | A |
| 4790259 | Morris et al. | Dec 1988 | A |
| 4908634 | Arimoto et al. | Mar 1990 | A |
| 5059218 | Pick | Oct 1991 | A |
| 5108470 | Pick | Apr 1992 | A |
| 5184706 | Christenson | Feb 1993 | A |
| 5603476 | Merk | Feb 1997 | A |
| 5846302 | Putro | Dec 1998 | A |
| 6294004 | Summers | Sep 2001 | B1 |
| 6574123 | Wiser, III et al. | Jun 2003 | B2 |
| 6764533 | Lobiondo, Jr. | Jul 2004 | B2 |
| 6902603 | Wiser, III | Jun 2005 | B2 |
| 7686869 | Wiser et al. | Mar 2010 | B2 |
| 7691186 | Wiser | Apr 2010 | B2 |
| 7708813 | Wiser et al. | May 2010 | B2 |
| 8070861 | Wiser et al. | Dec 2011 | B2 |
| 8252095 | Wiser et al. | Aug 2012 | B2 |
| 8252097 | Wiser | Aug 2012 | B2 |
| 8795601 | Wiser et al. | Aug 2014 | B2 |
| 8814994 | Wiser et al. | Aug 2014 | B2 |
| 9764331 | Wiser et al. | Sep 2017 | B2 |
| 9789494 | Wiser, III et al. | Oct 2017 | B2 |
| 9861990 | Wiser | Jan 2018 | B2 |
| 10058809 | Wiser, III | Aug 2018 | B2 |
| 20090320426 | Braunecker | Dec 2009 | A1 |
| 20140096494 | Wiser, III et al. | Apr 2014 | A1 |
| 20160303499 | Wiser | Oct 2016 | A1 |
| Entry |
|---|
| International Search Report and Written Opinion of the International Searching Authority for PCT Application No. PCT/US2019/022014 dated Jun. 11, 2019. |
| International Preliminary Report ion Patentability dated Sep. 15, 2020, and Written Opinion of the International Searching Authority Completed on May 18, 2019 for the International Application No. PCT/US19/22014, 6 pages. |
| Number | Date | Country | |
|---|---|---|---|
| 20190283040 A1 | Sep 2019 | US |
| Number | Date | Country | |
|---|---|---|---|
| 62642012 | Mar 2018 | US |
