Patent Publication Number: US-2018046229-A1

Title: Explosion proof assembly

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation-in-part of U.S. non-provisional application Ser. No. 13/683,834, filed Nov. 21, 2012, which claims the benefit under 35 U.S.C. §119(e) of U.S. Provisional Patent Application Ser. No. 61/635,959, filed on Apr. 20, 2012, and of U.S. Provisional Patent Application Ser. No. 61/592,053, filed on Jan. 30, 2012. The entirety of each application is incorporated herein by reference in entirety for all purposes. 
    
    
     STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
     Not Applicable. 
     BACKGROUND 
     Background of the Disclosure 
     The use of electrical devices in hazardous areas may lead to an increased risk of a fire or explosion triggered by the presence of the electrical device. For instance, an electrical device may serve as an ignition source in a hazardous area containing flammable gasses, vapors or dust. For this reason, electrical devices used in hazardous areas are often required to be certified according to the requirements specified in that particular jurisdiction. Further, often the types of protections required vary depending on the risks and hazards involved. 
     Hazardous environments have been categorized and regulated, but the specific classification, regulating, and governing thereof depends on jurisdiction. Electrical codes and standards for hazardous areas are generally understood as having two distinct paths. In North America, a ‘Class, Division’ system has been utilized, whereas other parts of the world use a ‘Zone System’ based predominantly on standards from the International Electrochemical Commission (IEC) and European Community for Electrotechnical Standardization (CENELEC). A main difference is in the Zone system is that the level of hazard probability is divided into three ‘zones’ as opposed to two ‘divisions’ 
     The types of hazardous environments are broken down into three classes, with each class focusing on different types of hazardous materials in the surrounding atmosphere. For instance: Class I areas include flammable gasses or vapors present in the air in sufficient quantities to produce an explosion in the presence of an ignition source; Class II areas include the presence of combustible dusts; and Class III areas include ignitable fibers or other materials too heavy to be suspended in the air in sufficient quantities to produce an ignitable mixture (e.g., wood chips, cotton, nylon, etc.). 
     Two common types of hazardous areas requiring protection for electrical devices are areas that contain flammable vapors and areas containing dust or other particulates susceptible to ignition. Further, each class is divided into two divisions based on the probability of hazardous materials being present in an ignitable or combustible concentration in the surrounding air. Division 1 defines hazardous environments where the pertinent hazardous material (e.g., vapors, dust, fibers) is present during normal conditions. Division 2 defines hazardous environments where the pertinent hazardous material is present only in abnormal or fault conditions (e.g., in the event of a container failure or other leak). 
     Regarding Class I hazardous environments involving flammable vapors, an electrical device may be used in such an area via an explosion proof enclosure or assembly configured to keep an internal explosion within the explosion proof enclosure from escaping outward, where it would ignite vapors outside of the enclosure. Thus, with regard to environments having flammable vapors, explosion proof assemblies are designed to both reduce the entry of flammable materials into the enclosure and also, in the event of an explosion within the enclosure, to prevent the escape of hot or burning material from escaping the enclosure. 
     Regarding Class II hazardous environments involving ignitable dusts and particulates, an electrical device may be used in such an area via a dust-ignition proof enclosure or assembly that is configured to prevent ignitable materials from entering the enclosure and by containing any arcs, sparks or heat within the enclosure that may ignite dust or other particulates in the surrounding environment. Also, there exists assemblies and enclosures for use with an electrical device that are referred to as “intrinsically safe,” where an intrinsically safe assembly including an electrical device is incapable of releasing sufficient electrical or thermal energy to cause ignition of a specific hazardous substance (i.e., Class I, Class II and Class III substances) under normal or abnormal conditions. Further, “non-incendive” components are non-sparking and can be used in Div1, Zone1 areas when coupled with explosion proof enclosure. 
     While assemblies or enclosures have been developed for use in hazardous areas, these components are often expensive and not configured for use with particular electrical devices. Also, these components may only satisfy the requirements for a particular class and division, and thus may not be used in other hazardous environments or in hazardous environments under abnormal conditions (i.e., Division 2 conditions). Further, these components may be permanently coupled to the protected electrical device, restricting the use of multiple electrical devices with the same enclosure. Thus, there is a need in the art for an intrinsically safe or explosion proof assembly and/or enclosure capable of being safely used in varying types of conditions hazardous environments. Also, it would be beneficial if such an enclosure was not permanently coupled to or formed integrally with the protected electrical device, allowing the use of different electrical devices with the same enclosure. 
     It should be noted that standards differ depending on what part of the world a user is in. It is desirous to have an explosion proof assembly for a mobile device capable of meeting stringent ATEX/IECEx (International Electrotechnical Commission) for zones 1 and 2, in addition to North America Class 1, Divisions 1 and 2 for safe operation around hazardous gas, vapor and dust-based atmospheres. This means any such assembly should be able to meet the most difficult part of any specification, which may be different by way of example each of ATEX, IECEx, and NA. 
     SUMMARY 
     Embodiments of the disclosure pertain to an explosion proof assembly that may include a first portion that may further have a first portion rear face, a first portion outer edge, a first portion inner edge, a first portion dissipation barrier, an isolator housing receptacle, a pin housing receptacle, and a window; an outer touchscreen adhesively sealed around a perimeter of the first portion rear face; a second portion releasably coupled to the first portion, the second portion may further have a second portion inner surface defined by a second portion inner edge that transitions into a second portion dissipation barrier, an isolator housing, and a pin housing. 
     The assembly may include a mobile device disposed within the first portion and the second portion. The mobile device may be operable via a mobile device touchscreen. In aspects, the first portion and the second portion may be configured to be releasably coupled to each other. The isolator housing may mate within the isolator housing receptacle. The pin housing may mate within the pin housing receptacle. Upon assembly, the outer touchscreen may be transmissive to the mobile device touchscreen of a touch actuation signal made thereon. 
     The mobile device may include an input connector. The isolator housing may include an isolator bore. An isolator may be disposed within the isolator bore. 
     The first portion may include a plurality of first mating apertures. The second portion may include a plurality of second mating apertures corresponding to the plurality of first mating apertures. Each respective first mating aperture and second mating aperture may have a fastener securely disposed therein. One or more of the fasteners may be tightened to a torque value in the range of about 5 N·m to about 6 N·m. The isolator may be threadingly tightened in the isolator bore. The isolator may be tightened to a torque value in the range of about 15 N·m to about 25 N·m. 
     The mobile device may be configured for taking photos via a camera lens. The second portion may include a lens window. Upon assembly the camera lens and the lens window may be aligned. 
     The mobile device may include an on-off button. The pin housing may include a movable pin. Upon assembly the movable pin may be aligned with the on-off button. In aspects, depressing of the movable pin may result in depressing the on-off button. 
     The mobile device may be configured for electromagnetic wireless recharging functionality. The second portion may include a second portion window. A rear window glass may be adhesively sealed therearound to a second portion rear surface, thereby closing off the second portion window. 
     Upon coupling the assembly may be configured to dissipate a flame resultant from an explosion of the mobile device prior to any portion of the flame exiting the assembly. 
     Other embodiments of the disclosure pertain to an explosion proof assembly that may include a first portion comprising a first portion rear face, a first portion outer edge, a first portion inner edge, a first portion dissipation barrier, an isolator housing receptacle, a pin housing receptacle, and a window; an outer touchscreen adhesively sealed around a perimeter of the first portion rear face; a second portion releasably coupled to the first portion to form an enclosure, the second portion further comprising a second portion inner surface defined by a second portion inner edge that transitions into a second portion dissipation barrier extending substantially therearound, an isolator housing, and a pin housing; a mobile device disposed within the enclosure, the mobile device being operable via a mobile device touchscreen. The isolator housing may mate within the isolator housing receptacle. The pin housing may mate within the pin housing receptacle. Upon coupling the outer touchscreen may be transmissive to the mobile device touchscreen of a touch actuation signal made thereon. The mobile device may include an input connector. The isolator housing may include an isolator bore. An isolator may be disposed within the isolator bore. 
     Yet other embodiments of the disclosure pertain to an explosion proof assembly comprising that may include a first portion comprising a first portion rear face, a first portion outer edge, a first portion inner edge, a first portion dissipation barrier, an isolator housing receptacle, a pin housing receptacle, and a window; an outer touchscreen adhesively sealed around a perimeter of the first portion rear face; a second portion releasably coupled to the first portion to form an enclosure, the second portion further comprising a second portion inner surface defined by a second portion inner edge that transitions into a second portion dissipation barrier extending substantially therearound, an isolator housing, and a pin housing; a mobile device disposed within the enclosure, the mobile device being operable via a mobile device touchscreen. 
     The isolator housing may mate within the isolator housing receptacle. The pin housing may mate within the pin housing receptacle. Upon coupling the outer touchscreen may be transmissive to the mobile device touchscreen of a touch actuation signal made thereon. The mobile device may include an input connector. The isolator housing may include an isolator bore. An isolator may be disposed within the isolator bore. The enclosure may be configured to dissipate a flame resultant from an explosion of the mobile device prior to any portion of the flame exiting therefrom. 
     These and other embodiments, features and advantages will be apparent in the following detailed description and drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       A full understanding of embodiments disclosed herein is obtained from the detailed description of the disclosure presented herein below, and the accompanying drawings, which are given by way of illustration only and are not intended to be limitative of the present embodiments, and wherein: 
         FIG. 1A  shows a front exploded or disassembled view of an embodiment of an explosion proof tablet assembly according to embodiments of the disclosure; 
         FIG. 1B  shows a rear exploded or disassembled view of an embodiment of an explosion proof tablet assembly according to embodiments of the disclosure; 
         FIG. 2A  is a front view of the explosion proof tablet assembly of  FIG. 1A  in an assembled configuration according to embodiments of the disclosure; 
         FIG. 2B  is a back view of the explosion proof table assembly of  FIG. 1A  in an assembled configuration according to embodiments of the disclosure; 
         FIG. 3  is a perspective view of an enclosure of the assembly of  FIG. 1A  in an assembled configuration according to embodiments of the disclosure; 
         FIG. 4  shows a front-side zoomed-in view of an enclosure of the explosion proof table assembly of  FIG. 1A  according to embodiments of the disclosure; 
         FIG. 5  shows a rear-side zoomed-in view of an enclosure of the explosion proof table assembly of  FIG. 1A  according to embodiments of the disclosure; 
         FIG. 6A  shows a front-side exploded view of another embodiment of an explosion proof tablet assembly according to embodiments of the disclosure; 
         FIG. 6B  shows a rear-side exploded view of another embodiment of an explosion proof tablet assembly according to embodiments of the disclosure; 
         FIG. 7  shows a zoomed-in view of an enclosure of the explosion proof table assembly of  FIGS. 6A and 6B  according to embodiments of the disclosure; 
         FIG. 8  shows a zoomed-in view of an enclosure of the explosion proof table assembly of  FIGS. 6A and 6B  according to embodiments of the disclosure; 
         FIG. 9  is another embodiment of an explosion proof enclosure according to embodiments of the disclosure; 
         FIG. 10A  is a frontward isometric view an explosion proof assembly according to embodiments of the disclosure; 
         FIG. 10B  is a frontward isometric component breakout view the assembly of  FIG. 10  according to embodiments of the disclosure; 
         FIG. 10C  is a rearward isometric component breakout view of the assembly of  FIG. 10  according to embodiments of the disclosure; 
         FIG. 10D  is a side cross-sectional view of an unassembled enclosure according to embodiments of the disclosure; 
         FIG. 10E  is a side cross-sectional view of an assembled enclosure having a mobile device therein according to embodiments of the disclosure; 
         FIG. 10F  is a side view of an input connector of a mobile device accessible through an isolator bore of an explosion proof assembly according to embodiments of the disclosure; 
         FIG. 11A  is a close-up cross-sectional view of a flame path an assembled enclosure according to embodiments of the disclosure; 
         FIG. 11B  is a close-up cross-sectional view of a flame in the flame path of the assembled enclosure of  FIG. 11A  according to embodiments of the disclosure; 
         FIG. 12  is a back isometric component breakout view of an explosion proof assembly having a modified second portion according to embodiments of the disclosure; 
         FIG. 13A  is a top view of a hand-held accessory releasably coupled to a rear side of an explosion proof assembly according to embodiments of the disclosure; 
         FIG. 13B  is a top view of the hand-held accessory of  FIG. 13A  according to embodiments of the disclosure; 
         FIG. 13C  is a side profile view of a user holding the explosion proof assembly of  FIG. 13A  according to embodiments of the disclosure; 
         FIG. 14A  is a top view of a magnetic attachment accessory releasably coupled to a rear side of an explosion proof assembly according to embodiments of the disclosure; and 
         FIG. 14B  is a side profile view of a user using the explosion proof assembly of  FIG. 14B  while magnetically attached to a surface according to embodiments of the disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Herein disclosed are novel apparatuses, systems, and methods that pertain to an explosion proof enclosure, details of which are described herein. 
     Embodiments of the present disclosure are described in detail with reference to the accompanying Figures. In the following discussion and in the claims, the terms “including” and “comprising” are used in an open-ended fashion, such as to mean, for example, “including, but not limited to . . . ”. While the disclosure may be described with reference to relevant apparatuses, systems, and methods, it should be understood that the disclosure is not limited to the specific embodiments shown or described. Rather, one skilled in the art will appreciate that a variety of configurations may be implemented in accordance with embodiments herein. 
     Although not necessary, like elements in the various figures may be denoted by like reference numerals for consistency and ease of understanding. Numerous specific details are set forth in order to provide a more thorough understanding of the disclosure; however, it will be apparent to one of ordinary skill in the art that the embodiments disclosed herein may be practiced without these specific details. In other instances, well-known features have not been described in detail to avoid unnecessarily complicating the description. Directional terms, such as “above,” “below,” “upper,” “lower,” “front,” “back,” “right”, “left”, “down”, etc., are used for convenience and to refer to general direction and/or orientation, and are only intended for illustrative purposes only, and not to limit the disclosure. 
     Connection(s), couplings, or other forms of contact between parts, components, and so forth may include conventional items, such as lubricant, additional sealing materials, such as a gasket between flanges, o-rings, PTFE between threads, and the like. The make and manufacture of any particular component, subcomponent, etc., may be as would be apparent to one of skill in the art, such as molding, forming, machining, additive manufacturing, etc. Embodiments of the disclosure provide for one or more components to be new, used, and/or retrofitted to existing machines and systems. One or more components may be made from a metallic material, such as stainless steel, aluminum, metal alloy, etc. 
     The various characteristics mentioned above, as well as other features and characteristics described in more detail below, will be readily apparent to those skilled in the art upon reading the following detailed description of the embodiments, and by referring to the accompanying drawings. 
     Terms 
     The term “connected” as used herein can refer to a connection between a respective component (or subcomponent) and another component (or another subcomponent), which can be fixed, movable, direct, indirect, and analogous to engaged, coupled, disposed, etc., and can be by screw, nut/bolt, weld, and so forth. Any use of any form of the terms “connect”, “engage”, “couple”, “attach”, “mount”, etc. or any other term describing an interaction between elements is not meant to limit the interaction to direct interaction between the elements and may also include indirect interaction between the elements described. 
     The term “fluid” as used herein can refer to a liquid or gas and is not solely related to any particular type of fluid such as hydrocarbons. 
     The terms “pipe”, “conduit”, “line” or the like as used herein can refer to any fluid transmission means, and can be tubular in nature. 
     The term “combustion” as used herein can refer to an exothermic reaction between a fuel and an oxidant that can result in the production of a flame (the visible part of a fire) and a gaseous product. 
     The term “explosion” as used herein can refer to a combustion in the form of a release of energy in an extreme manner, usually with the generation of high temperatures and the release of gases. An explosion can produce a flame, heat, a shock wave, a pressure wave, or other effects. An explosion can be referred to as a form of combustion. 
     The term “flame” as used herein can refer to the visible part of a fire. Flame can refer to a product of a combustion reaction emitting visible, infrared, and sometimes ultraviolet light, the frequency spectrum of which depends on the chemical composition of the burning material and intermediate reaction products. 
     The term “explosion proof assembly” as used herein can refer to an assembly that can adequately prevent an explosion in an environment external to the assembly as a result of an explosion or ignited fire within the assembly. 
     The term “flame extinguishing enclosure” as used herein can refer to an assemblable enclosure that upon proper coupling together provides or otherwise configures the enclosure with a flame path that is suitable to extinguish (or quench, etc.) a flame that results from a combustion, explosion, or other form of ignited fire from within the enclosure. The term can be further in reference to accomplishing a desired configuration and result in light of certain industry, standards, specifications, requirements, etc. The term “flame dissipating” can be analogous to flame extinguishing. 
     The term “flame path” as used herein can refer to a spatial region of some amount of direction and/or distance (linear or non-linear) within an explosion proof assembly where a flame may traverse. The explosion proof assembly can be configured in a manner to provide a suitable flame path that ultimately results in the extinguishing of the flame before it (or any part thereof) can leave or otherwise exit the assembly. 
     The term “transmissive” as used herein can refer to the ability of a material to pass a signal therethrough. For example, a touchscreen of an explosion proof assembly can be transmissive of a signal created by human touch thereto to a touchscreen of a mobile device retained within the assembly that is in contact with therewith. This can occur, for example, by changing an electrical property of both the touchscreens, such as resistance or capacitance. 
     The term “CNC machined” can refer to a computer numerical control (CNC) process whereby a robot or machinist runs computer-operated equipment to create machine parts, tools and the like. 
     The embodiments described herein include an explosion proof assembly that includes a tablet computer having a touch screen, such as the iPad® or iPhone produced by Apple, Inc. Particularly, the explosion proof assembly includes a tablet computer or phone disposed within a removably coupled enclosure. The enclosure allows for the use of the tablet computer or phone in hazardous areas including flammable vapors and ignitable dust, corresponding to Class 1 Div2 Class II Div 2, Class 1 Div I, Class 2 Div I, Zone2, Zone22, Zone1 and Zone21 areas. Also, the enclosure allows for the use of the tablet or phone in hazardous areas during Zone/Division 1, 2 conditions. Further, the assembly is configured to be non-incendive such that the assembly does not allow for the release of any sparks or electrical/thermal energy sufficient to cause ignition of hazardous substances in the surrounding environment. 
     In an embodiment, a non-incentive, non-modified tablet computer or phone (e.g., iPad2, iPad3, etc.) with an accompanying enclosure is provided that allows a user to operate the tablet in hazardous environments, including Class I/Division 2, Class II/Division 2, Class I/Division 1, Class II/Division 1, ATEX Zone 2, Zone 1 and IECEx classified areas. 
     Referring initially to  FIGS. 1A-1B , an explosion proof assembly  10  is shown in an exploded or disassembled configuration and generally includes a tablet computer or phone  100  and an enclosure  200  having a first or upper portion  300  that is releasably coupled to a second or lower portion  400 . In this embodiment, tablet  100  is an iPad® produced by Apple, Inc. However, in other embodiments tablet  100  may comprise other varying types and styles of tablet computers or phones, including but not limited to those from other manufacturers. In this embodiment, enclosure  200  is formed from milled aluminum satisfying the NEMA 4 standard. 
     However, in other embodiments enclosure  200  may be formed from other rugged materials. Tablet  100  has a flat front face  101  defined by a front outer edge  103 , which includes a touch screen  102 . Tablet  100  also includes a flat rear face  105  that is defined by a rear outer edge  107 . Extending between front outer edge  103  and rear outer edge  107  is a chamfered surface  109  having four chamfered corners  111 . Tablet  100  also includes a first button  104  (home button) disposed on front face  101 , a camera lens  106  disposed on rear face  105  and a second button  108  (on/off button) disposed on chamfered edge  109 . An input connector  110  is disposed on chamfered surface  109 . Input connector  110  is configured to allow for data and/or electrical power transfer between tablet  100  and an external electrical device. 
     Referring now to  FIGS. 1A-1B and 2A-2B , while  FIGS. 1A-1B  show assembly  10  in an exploded or disassembled configuration,  FIGS. 2A-2B  show assembly  10  in a closed or assembled configuration where there is no wiring or other conductor exposed to the surrounding environment. Regarding enclosure  200 , first portion  300  includes a flat front face  301  having a central window  302  extending therethrough that is defined by an outer edge  303 . Extending from face  301  is a curved outer surface  305  that extends around face  301 . A first aperture  304  and a second aperture  306  are also disposed on front face  301  and extend therethrough. Thus, first aperture  304  provides a means for actuating first button  104  disposed on front face  101  of tablet  100 . Also, second aperture  306  provides a window for a front cameral  12  ( FIG. 2A ) of tablet  100 , that may be disposed on front face  101  of tablet  100 . 
     First portion  300  also includes a flat rear face  307  ( FIG. 1B ) disposed opposite of front face  301  and having a sealing surface  308  that extends from face  307 . Sealing surface  308  extends between an outer edge  309  and the outer edge  303  of window  302 . Surface  308  is configured to sealingly engage the front face  101  of tablet  100  so as to prevent or at least substantially restrict fluids or particles (e.g., dust, particulates, fibers, etc.) from entering or exiting enclosure  200  when assembly  10  is in its assembled configuration ( FIGS. 2A-2B ). Sealing surface  308  also includes a first portion  308   a  that extends about first aperture  304  and a second portion  308   b  that extends about second aperture  306 . Extending from curved surface  305  is a sealing mechanism  320 , which is configured to seal against a corresponding sealing assembly  420  of second portion  400  when first portion  300  and second portion  400  are coupled to each other. 
     Second portion  400  includes an inner flat face  401  defined by a rectangular outer edge  402 . Extending from edge  402  of face  401  is an inner chamfered surface  403  extending about inner face  401  and having four chamfered corners  405 . Portion  400  also includes a flat outer face  411  defined by an outer edge  404 . Extending from edge  404  is an outer chamfered surface  407  that extends about outer face  411  and has four chamfered corners  409 . Sealing mechanism  420  is disposed between inner chamfered surface  403  and outer chamfered surface  407 . 
     A ledge  408  extends from chamfered outer surface  407  and includes an aperture  410 , allowing access to actuate second button  108  of tablet  100 . Referring briefly to  FIG. 3 , enclosure  200  in the assembled configuration includes an internal chamber  440  disposed between first section  300  and second section  400 . Sealing assemblies  320 ,  420 , and sealing surface  308  of portion  300  are configured to seal internal chamber  440  from the external environment once tablet  100  has been disposed in chamber  440 , as shown in  FIGS. 2A-2B . 
     Referring now to  FIGS. 4 and 5 , sealing mechanism  320  of first portion  300  includes an inner surface  321  that extends from an outer edge  322  of curved surface  305 . Mechanism  320  also includes a tab  323  that extends inward (relative to second portion  400 ) from surface  321 . Tab  323  includes four rounded corners  323   a  and has a vertical inner surface  324  and an oppositely disposed vertical outer surface  325 . Correspondingly, sealing mechanism  420  of second portion  400  includes an inner surface  421  that extends from an outer edge  422  of chamfered surface  407 . Mechanism  420  also includes a tab  423  that extends inward (relative to first portion  300 ) from surface  421 . Tab  423  includes four rounded corners  423   a  and has a vertical inner surface  424  and an oppositely disposed vertical outer surface  425 . 
     When assembly  10  is in the assembled configuration, as shown in  FIGS. 2A-2B , outer surface  325  of tab  323  is configured to sealingly engage inner surface  424  of tab  423 , thus preventing or at least substantially restricting fluids or particles (e.g., dust, particulates, fibers, etc.) from entering or exiting enclosure  200  when assembly  10  is in its assembled configuration. First portion  300  and second portion  400  may be releasably coupled to each other by mechanical means, such as evenly distributed bolts or screws extending through curved surface  305  of first portion  300  and chamfered surface  407  of second portion  400 . An adhesive or other substance may also be disposed on either surface  321  of portion  300  or on surface  421  of portion  400 , thus causing portions  300  and  400  to adhere to each other upon assemblage. 
     Referring now to  FIGS. 6A and 6B , another embodiment includes an explosion proof assembly  20  that generally includes tablet  100  and an enclosure  500  having a first portion  600  and a second portion  700 . Enclosure  500  includes similar features as enclosure  200  and thus identical features are numbered similarly. In this embodiment, enclosure  500  is formed from milled aluminum satisfying the NEMA 4 standard. However, in other embodiments enclosure  500  may be formed from other rugged materials. As with assembly  10 , when assembly  20  is in the assembled configuration there is no wiring or other conductor exposed to the surrounding environment, as will be explained further herein. In this embodiment, second portion  600  includes a data and/or recharging interface  740  coupled to inner face  401  and outer face  411  of portion  600 . 
     Referring now to  FIGS. 7 and 8 , data interface  740  generally includes a cable  742  having a first end  742   a  coupled to a first connector  744  and a second terminal end  742   b  coupled to a second connector  750 . First connector  744  is a 30-pin dock connector configured to electrically couple with input connector  110  of tablet  100  ( FIGS. 5A and 5B ). Second connector  750  is a universal serial bus (mini-USB) connection port having an opening  752  disposed on surface  411 , which is coupled to second portion  400  by two screws  751  extending into surface  401 . Thus, when assembly  20  is in an assembled configuration (similar to the assembled configuration of assembly  10  shown in  FIGS. 2A-2B ), connector  744  is coupled to input  110 , establishing an electrical connection between tablet  110  and USB port  750 , which may be accessed by an external cable. A dust cap  753  is disposed on surface  411  and is coupled to surface  411  via a flange  754  and screw  755  that extends through flange  754  and into surface  411  of portion  400 . A cap portion  756  is disposed directly over opening  752  to prevent dust, fibers and other matter from contacting any pins or other electrical connectors within opening  752  of port  750 . In order to access opening  752  of port  750 , cap  753  may be rotated about screw  755 , such as to expose opening  752  to allow for the insertion of a male connector ( FIG. 7  shows cap  753  in the covered position). 
     Referring now to  FIG. 9 , another embodiment includes an enclosure  250  configured for use in an explosion proof assembly (e.g., assembly  10 ). Enclosure  250  includes similar features as enclosure  200  and thus identical numerals are numbered similarly. Enclosure  250  includes a first portion  350  and a second portion  450 , where portions  350  and  450  are configured to releasably couple to each other via a plurality of screws  454  Inner surface  321  of first portion  350  and chamfered surface  407  of second portion  450  each include an evenly distributed plurality of apertures  352 ,  452 , respectively, for receiving the plurality of screws  454 . 
     Referring to  FIGS. 1-5 , a method of forming explosion proof assembly  10  generally includes placing or disposing tablet  100  within the second portion  400  of enclosure  200  and sealing tablet  100  within enclosure  200  by coupling first portion  300  with second portion  400 . Once coupled, assembly  10  is in the assembled configuration such that assembly  10  satisfies the requirements of Class I, Division 2 and Class II, Division 2 hazardous area classifications. Also, touch screen  102  of tablet  100  may be safely actuated within Class I, Division 2 and Class II, Division 2 hazardous areas without violating the safety requirements of these areas. In other words, the assembly  10  includes an explosion-proof sealing or compartment for the enclosed tablet. 
     In the embodiment of  FIGS. 1-5 , placing tablet  100  within second portion  400  includes disposing tablet  100  such that the flat rear face  105  of tablet  100  is aligned with and/or engages the inner flat face  401  of second portion  401  of second portion  400 . Also, chamfered surface  109  and corners  111  of tablet  100  are aligned with and/or engage chamfered surface  403  and corners  405  of portion  400 . Coupling first portion  300  with second portion  400  of enclosure  200  includes aligning and engaging the sealing mechanism  320  of portion  300  with the sealing mechanism  420  of second portion  400 , such that inner surface  321  engages inner surface  421  and outer surface  325  of tab  323  engages surface  424  of tab  423 . 
     In the embodiment shown in  FIG. 9 , coupling the first portion  300  to the second portion  400  further includes extending the plurality of screws  454  through the plurality of apertures  352  and  452 . However, in other embodiments coupling portions  300  and  400  may include disposing an adhesive on one or more of the surfaces of either sealing mechanism  320 ,  420 , respectively. In this embodiment, engagement between mechanisms  320  and  420  of enclosure  200  creates a seal satisfying the IP67 standard. However, in other embodiments the seal may satisfy other standards such as IP68 or IP65, etc. In some embodiments, an explosion-proof sealing or compartment is provided thereby. 
     Referring now to  FIGS. 6A-8 , a method of forming explosion proof assembly  20  generally includes placing or disposing tablet  100  within the second portion  700  of enclosure  500  and sealing tablet within enclosure  500  by coupling first portion  600  with second portion  700 . As with assembly  10 , once coupled assembly  20  is in the assembled configuration and thus satisfies the requirements of Class I, Division 2 and Class II, Division 2 hazardous area classifications. Also, touch screen  102  of tablet  100  may be safely actuated within Class I, Division 2 and Class II, Division 2 hazardous areas without violating the safety requirements of these areas. Tablet  100  is disposed within portion  700  in a similar fashion to how tablet  100  is disposed within portion  400 . However, in the embodiment of assembly  20 , disposing tablet  100  within portion  700  further includes coupling connector  110  of tablet  100  with interface  740  of portion  700 . Specifically, coupling connector  110  with interface  740  includes coupling connector  110  with first connector  744  of interface  740 . Once coupled, an electrical signal may be communicated between tablet  100  and port  750 . 
     As with enclosure  200  of assembly  10 , portions  600  and  700  of assembly  20  are coupled in a similar fashion as portions  300  and  400  are coupled to form assembly  10  (e.g., sealing mechanisms  320 ,  420 , respectively, of portions  600  and  700  are engaged with each other). Portions  600  and  700  may also be coupled via a plurality of screws (e.g., screws  454 ) that extend through apertures (e.g., apertures  352 ,  452 ) disposed in portions  600  and  700 . In this embodiment, engagement between mechanisms  320  and  420  of enclosure  500  creates a seal satisfying the IP65 standard. However, in other embodiments the seal may satisfy other standards such as IP68 or IP65, etc. 
     Once assembly  20  is in the assembled configuration an electrical signal may be communicated between an external electrical device and tablet  100 . A method for communicating a signal between an external device and tablet  100  includes rotating cap portion  756  of dust cap  753  about screw  755  such that opening  752  is exposed. Once opening  752  is exposed, a connector of the external device or conduit is coupled to port  750  of interface  740  such that an electrical signal may be communicated between tablet  100  and the external device or conduit. In this manner, tablet  100  may be safely recharged within enclosure  500  while assembly  20  is in a hazardous area (e.g., Class I, Division 2 and Class II, Division 2 areas). 
     Referring now to  FIGS. 10A, 10B, 10C, 10D, 10E, and 10F  together, a front isometric assembled view, a front isometric component breakout view, a back isometric component breakout view, an unassembled lateral cross-sectional view, an assembled lateral cross-sectional view, and a side view of an accessible input connector of a mobile device, respectively, of an explosion proof assembly, in accordance with embodiments disclosed herein, are shown. 
     As illustrated, explosion proof assembly  1000  may include a mobile device  1100  associated with a flame extinguishing enclosure  1200 . The enclosure  1200  may include a first or upper portion  1300  configured for releasable coupling to a second or lower portion  1400 . In aspects, the mobile device  1100  may be an iPad® or iPhone® produced by Apple, Inc., including the recent iPhone 8. However, the mobile device  1100  is not meant to be limited, and include other varying types and styles of computer-related devices, including but not limited to those from other manufacturers. 
     Embodiments herein provide for an explosion proof assembly  1000  configured to pass a ‘resistance to impact’ test in accordance with IEC 60079-0 (see Section 26.4.2 describing a drop-ball test). In the drop-ball test, an object, usually a ball of 1 kg mass, is dropped from a range of 0.2 m to 0.4 m. Accordingly, outer touchscreen  1302  must be configured to withstand the impact of the dropped ball without effecting the ability of assembly  1000  to be ‘explosion proof’. 
     “Explosion proof” as referenced to the assembly  1000  may refer to the enclosure  1200 , when assembled, being able to contain any explosion originating therein. The enclosure  1200 , when assembled, may be configured and able to completely extinguish a flame generated from therein, such as from an explosion or other similar failure of mobile device  1100 . 
     Enclosure  1200  may be formed from milled aluminum satisfying the NEMA 4 standard. However, in other embodiments enclosure  1200  may be formed from other rugged materials. Of significance, the explosion proof assembly  1000  may be configured for use in hazardous areas, including: North America Class I, Division 1; Class I, Division 2; Class II, Division 2 areas; and Class II, Division 1, and non-US Zone 2 and 1 ATEX and IECEx classified areas. As would be apparent to one of skill in the art, in order to certified by these bodies for satisfactory use within such a setting, various requirements must be met. 
     Standards pertain to impact, dropping, thermal conditioning (or endurance), thermal shock, temperature requirements, explosive pressure, overpressure, torque test, and so forth. 
       FIGS. 10B and 10C  together show assembly  1000  in a breakout view, while  FIG. 10A  shows assembly  1000  in a closed or assembled configuration where there is no wiring or other conductor exposed to the surrounding environment. When assembled the assembly  1000  may be configured for use in Class I, Division 1; Class I, Division 2; Class II, Division 2 areas; and Class II, Division 1, and non-US Zone 2 and 1 ATEX and IECEx classified areas. 
     The assembly  1000  may be configured for use in the setting when the upper portion  1300  is sealingly coupled with the lowered portion  1400 , with the mobile device  1100  disposed therein. ‘Sealingly coupled’ may include the portions  1300 ,  1400  being sealingly engaged to certain specification, but some amount of disconnect is permissible. In this sense ‘sealing’ may refer to a metal-to-metal seal. 
     Regarding the enclosure  1200 , the first portion  1300  may include a front face  1301 . The first portion  1300  may include a rear face  1307  disposed opposite of front face  1301 . The rear face  1307  may provide a suitable surface for sealing between the rear face  1307  and an outer touchscreen  1302 . The surface for sealing may extend between an inner edge  1303  and a rear face inner edge  1303   a , and therearound the rear face  1307 . As would be apparent the first portion  1300  may thus have its ‘window’ (or opening) closed off by the presence of the outer touchscreen  1302 . 
     The outer touchscreen  1302  may be a thin, flat piece of rigid and durable material suitable to meet various specifications identified herein. One of skill in the art would appreciate the outer touchscreen  1302  may be configured to withstand the aforementioned drop-ball test. Accordingly, the outer touchscreen  1302  may have a thickness T 1  in the range of about 0.5 mm to about 1.2 mm. The thickness T 1  may depend on the size of the touchscreen  1302 , which may further depend on the particular mobile device desired for use. 
     The second portion  1400  may include a second portion inner face  1401 . The inner face  1401  may be bordered by a second portion outer edge  1402 . There may be an inner chamfered surface  1403  extending around the outer edge  1402 . The inner surfaces of the second portion  1400  may be machined in a manner to accommodate to specification a particular mobile device. In this respect, chamfered or rounded surfaces may instead be linear. 
     The second portion  1400  may include a second portion rear outer face  1411 . The rear outer face  1411  may be generally flat. The second portion  1400  may include one or more chamfered corners  1405 , which may be configured to coincide with any respective chamfered corners of the first portion  1300  (as well as chamfered corners  1011  of the mobile device  1100 ). 
     The outer touchscreen  1302  may have a planar underside  1302   a  configured for complete transmissive mating and engagement with the touchscreen  1002  via contact point (or interface, layer, etc.)  1503 . In this respect the assembly  1000  may provide the synergistic effect of being able to isolate effects of any internal explosion from the surrounding environment, and yet a user can still access and operate the touchscreen interface (and buttons  1004 ,  1008 ) of the mobile device  1100 . One of skill would appreciate the contact point  1503  may be refer to a suitable amount of contact between the surface of the touchscreen  1002  and the outer touchscreen  1302 , whereby the mobile device is accessibly operable via interfacing with the outer touchscreen. 
     The front face  1301  may have an outer perimeter surface edge  1309  that may extend at around the face  1301  and to the rear face  1307 . 
     Referring particularly to the enclosure  1200  as shown in  FIGS. 10C and 10D , the first portion  1300  may include the front face  1301 , and the rear face  1307  disposed opposite of the front face  1301 . The rear face  1307  may provide a suitable surface for sealing between the rear face  1307  and the outer touchscreen  1302 . The surface for sealing may extend between an inner edge  1303  and the rear face inner edge  1303   a , and therearound the rear face  1307 . 
     As illustrated, the outer touchscreen  1302  may be adhesively and sealingly connected with the first portion  1300 , such as via a layer of an adhesive  1500 . The layer of adhesive  1500  may provide for a complete perimeter seal between the outer touchscreen  1302  and the first portion  1300 . The adhesive may be suitable to withstand changes of significance in temperature, or chemicals, both from internal and external to the enclosure  1200 . 
     The sealing engagement between the outer touchscreen  1302  and the first portion  1300  may be beneficial to so as to prevent or at least substantially restrict fluids or particles (e.g., dust, particulates, fibers, etc.) from entering or exiting the enclosure  1200  when the assembly  1000  is in its assembled configuration (e.g.,  FIG. 10A ). 
     The second portion  1400  may include a second portion inner face  1401 . The inner face  1401  may be bordered by a second portion outer edge  1402 . There may be an inner chamfered surface  1403  extending around the outer edge  1402 . 
     The second portion  1400  may include a second portion rear outer face  1411 . The rear outer face  1411  may be generally flat. The inner face  1401  may trail off into a surface forming the first dissipation wall  1417 , which may extend outward and upward from edge  1402 , including in an arcuate manner, into proximate engagement with the outer touchscreen  1302 . As shown, the first dissipation wall  1417  may be the first (lateral) contact point of any flame resulting from failure of the mobile device  1100 . 
     The first portion  1300  may similarly have a second dissipation wall  1317 . In the event of any remnant flame moving past the first dissipation wall  1417 , the flame will be resisted from passing any further beyond the second dissipation wall  1317 . As a further measure of added redundancy, the second portion may have a third dissipation wall  1418 . One of skill would appreciate the first portion  1300  may have a grooved surface or region to accommodate mating with the first dissipation wall  1417  and the third dissipation wall  1418 . And similarly the second portion  1400  may have a grooved surface or region to accommodate mating with the second dissipation wall  1318 . 
     Referring again to  FIGS. 10A-10F  together, the surface edge  1309  of the first portion  1300  may be flat, planar, rounded, or any suitable shape, and is not meant to be limited. The surface edge  1309  may have one or more bumper mating holes  1313 , whereby a respective bumper  1012  may be coupled therewith (via bumper couplers  1013 , which may be screws). Accordingly, one or more bumpers  1012  (only one shown here) may be coupled to the enclosure  1200 . 
     The bumper  1012  may be of a material suitable for providing extra protection to the mobile device  1100 , particularly for shock absorption in the case of inadvertent dropping of the assembly  1000 . Although not limited, the bumper  1012  may be made of rubber, plastic, silicone, or other comparable material. Moreover, although the Figures may illustrate one or more corner bumpers, the bumper  1012  could have other shapes, including being disposed around the entire perimeter (or in addition or alternatively to other portions) of the assembled enclosure  1200 . 
     Of significance, the mating faces—namely rear face  1307  (including respective undulations, edges, and so forth) and inner surfaces  1401 ,  1402 ,  1403  (including respective undulations, edges, and so forth)—may be configured for sealing engagement therebetween. The sealing engagement may be metal-to-metal. In order to facilitate the flame extinguishing characteristic of the enclosure  1200 , it is desirous to have significantly reduced separation between the corresponding mating surfaces of the first portion  1300  and the second portion  1400 . 
     Any or both of the first portion  1300  and the second portion  1400  may be made from CNC machining. 
     In this respect, when the first portion  1300  and the second portion  1400  are coupled together, the distance between any respective and proximate surface of the portions  1300 ,  1400  may be less than about 0.05 inches. In aspects, the gap at any particular proximate contact point may be in the range of about 0.01 inches to about 0.05 inches. The use of an extremely tight or close tolerance seal around the portions  1300 ,  1400  is of significance in meeting specification for a certified explosion proof assembly. 
     The first portion  1300  may have one or more first mating apertures  1310 . The first mating apertures  1310  may be configured for receiving respective fasteners  1511 . In aspects, the fasteners  1511  may be screw-type fasteners. As a non-limiting example, the fasteners  1511  may be A2 Stainless M5×0.8×8 mm Torx head screws. The fasteners  1511  may be insertable through respective second portion apertures  1408 . Although shown as being insertable through the second portion  1400  and threadingly into apertures of the first portion  1300 , this configuration could just as well be reversed. 
     Although not limited to any particular arrangement or number, there may be sufficient placement and use of fasteners  1511  to promote or otherwise contribute to the desired tolerance fit between the first portion  1300  and the second portion  1400 . The fasteners  1511  may be tightened to a fastener torque value in the range of about 3 N·m to about 8 N·m. In aspects, the fastener torque value may be at least 5 N·m. The fastener torque value may be in the range of about 5 N·m to about 6 N·m. 
     Mobile device  1100  may have a front face  1001  that may further include a front outer edge  1003 , as well as an operable touch screen  1002 . The mobile device  1100  may include a rear face  1005  that may be defined by a rear outer edge  1007 . There may be a chamfered surface or edge  1009 , which may extend between the outer edge  1003  and the rear outer edge  1007 . In aspects, there may be one or more chamfered corners  1011 . 
     The mobile device  1100  may include a first button  1004  (which may be a ‘home’ button or switch as would be understood by one of skill in the art) disposed on the front face  1001 . There may be other buttons that provide various functionality based on user interaction, such as and a second button  1008  (which may be an ‘on/off’ button or switch as would be understood by one of skill in the art). The second button  1008  may be disposed on chamfered surface  1009 . In accordance with embodiments herein the first button  1004  and the second button  1008  may be completely accessible and actuatable when the portions  1300 ,  1400  are coupled together. 
     The mobile device  1100  may include a camera lens  1006  (associated with respective camera circuitry), which may be disposed on the rear face  1005 . In accordance with embodiments herein the camera function of the mobile device  1100 , including being able to take pictures via lens  1006 , may be completely accessible and actuatable when the portions  1300 ,  1400  are coupled together. The lens  1006  may align with outer lens window  1406 . The outer lens window may be configured to meet or exceed specification for the explosion proof assembly  1000 . 
     The mobile device  1100  may include an input connector  1010 . The input connector  1010  may be configured to allow for data and/or electrical power transfer between mobile device  1100  and any external electrical device, such as a power charger (including respective cord and connector—not shown here). In accordance with embodiments herein the input connector  1010  may be completely isolated from the external environment of the assembly  1000  when the portions  1300 ,  1400  are coupled together. Still, the input connector  1010  may be completely accessible when the portions  1300 ,  1400  are coupled together. 
     The difference in isolation or accessibility to the input connector  1010  may be as a result of the presence of an isolator member  1513 . In this respect the assembled enclosure  1200  may provide the ability for a user to gain access to the input connector  1010  without having to resort to disassembly. Although not meant to be limited to any particular type of isolation/access configuration, the Figures show the lower portion  1400  may have a generally block- or cubical-shaped isolator housing  1414 , with an isolator bore  1415 . 
     The housing  1414  may be configured for mating into a housing receptacle  1313  formed in the first portion  1300 . The isolator bore  1415  may be configured with threads for a threaded engagement with respective threads of the isolator member  1513 . In embodiments, the isolator member  1513  may be a screw. 
     The threaded engagement may have a suitable tolerance for sufficient prevention of a flame traveling therethrough. In embodiments, the isolator member  1513  may be tightened within the bore  1415  to a torque value in the range of about 15 Newton Meters (“N·m”) to about 25 N·m. The torque value may be at least 20 N·m. The isolator member  1513  may have a raised head configured for easy tool access, such as via wrench, allen wrench, or other type of feature suitable for a tool to provide the requisite torque value to the tightened isolator member  1513 . In other embodiments, the enclosure  1200  may have a non-torque configuration. For example, the isolator member  1513  may be self-locking. 
     There may be a gasket  1514  and a gasket plate  1515  configured to provide sealing engagement with the enclosure  1200  in the proximity of the housing  1414  and the receptacle  1313 . This configuration may be able to further prevent or at least substantially restrict fluids or particles (e.g., dust, particulates, fibers, etc.) from entering or exiting enclosure  1200  via bore  1415  when the enclosure  1200  is assembled. For convenience there may be a retention member  1516  configured to retain the isolator member  1513  with the assembly  1000 . The retention member  1516  may be a chain link having one end connected to the isolator member  1513 , and an other end connected to part of the assembly  1000 , such as the second portion  1400  or the gasket plate  1515 . There may be a washer  1517  for sealing between the head  1513   a  and the gasket plate  1515 . The gasket plate  1515  may be coupled to the enclosure  1200  via one or more gasket fasteners  1518  inserted into respective gasket fastener apertures  1519 . In aspects, the gasket fasteners  1518  may be threadingly engaged into the apertures  1519 . 
     One of skill would appreciate that enclosure  1200  could be configured to swap the housing  1414  into the first portion  1300 , and the receptacle  1313  into the second portion  1400 . 
     In accordance with embodiments herein the second button  1008  may be completely isolated from the external environment of the assembly  1000  when the portions  1300 ,  1400  are coupled together. Still, the second button  1008  may be completely accessible when the portions  1300 ,  1400  are coupled together. 
     The difference in isolation but yet accessibility to the second button  1008  may be as a result of the presence of a sealed depressible pin  1407 . The pin  1407  may be biased, such as via spring or other suitable manner, whereby when a top  1407   a  of the pin  1407  is depressed, it will subsequently depress a bottom  1407   b  of the pin  1407  against the second button  1008 ; however, when the pin  1407  is released, the pin  1407  releases from depression of the second button  1008 . 
     The pin  1407  may be sealingly disposed within a pin bore  1409 . In this respect the assembled enclosure  1200  may provide the ability for a user to gain access to or otherwise actuate the second button  1008  without having to resort to disassembly, and still maintain desired isolation from the surrounding environment. Although not meant to be limited to any particular type of isolation/access configuration, the Figures show the second portion  1400  may have a generally block- or cubical-shaped pin housing  1416 , with the pin bore  1409 . 
     The pin housing  1416  may be configured for mating into a pin housing receptacle  1312  formed in the first portion  1300 . One of skill would appreciate that enclosure  1200  could be configured to swap the pin housing  1416  into the first portion  1300 , and the pin housing receptacle  1312  into the second portion  1400 . If an explosion occurs within the enclosure  1200 , the pin  1407  may will be pushed (urged) against pin housing  1416  to prevent any flame to pass through  1416 . 
     Referring now to  FIGS. 11A and 11B  together, a zoom-in cross-sectional view of a flame path, and a zoom-in cross-sectional view of a flame path with a flame therein, of an explosion proof assembly, in accordance with embodiments disclosed herein, are shown. 
     As should be readily apparent,  FIGS. 11A and 11B  may not be to scale. Instead, the Figures are intended to illustrate that upon zoom-in inspection, various passageways, gaps, and interstices may be present when the enclosure  1200  is assembled together (i.e., first portion  1300  and second portion  1400  are coupled together). For example, there may be a gap  1512  having a distance of less than about 0.04 inches (1000 microns) between various contact points of the first portion  1300  and the second portion  1400 . 
     Although theoretically this could result in passage of, for example, gaseous material, air, and so forth, one of the key attributes of the assembled enclosure  1200  is the ability to dissipate a flame. 
     Regarding the enclosure  1200 , the first portion  1300  may include a front face  1301 . The first portion  1300  may include a rear face  1307  disposed opposite of front face  1301 . The rear face  1307  may provide a suitable surface for sealing between the rear face  1307  and an outer touchscreen  1302 . The surface for sealing may extend between an inner edge  1303  and a rear face inner edge  1303   a , and therearound the rear face  1307 . 
     The outer touchscreen  1302  may be adhesively and sealingly connected with the first portion  1300 , such as via a layer of an adhesive  1500 . The layer of adhesive  1500  may provide for a complete perimeter seal between the outer touchscreen  1302  and the first portion  1300 . The adhesive may be suitable to withstand changes of significance in temperature, or chemicals, both from internal and external to the enclosure  1200 . 
     The sealing engagement between the outer touchscreen  1302  and the first portion  1300  may be beneficial to so as to prevent or at least substantially restrict fluids or particles (e.g., dust, particulates, fibers, etc.) from entering or exiting the enclosure  1200  when the assembly  1000  is in its assembled configuration (e.g.,  FIG. 10A ). The sealing may further prevent any flame path between portion  1300  and the outer touchscreen  1302 . 
     The second portion  1400  may include a second portion inner face  1401 . The inner face  1401  may be bordered by a second portion outer edge. There may be an inner chamfered surface  1403  extending around the outer edge. 
     The second portion  1400  may include a second portion rear outer face  1411 . The rear outer face  1411  may be generally flat. The inner face  1401  may trail off into a surface forming the first dissipation wall  1417 , which may extend outward and upward from edge  1402 , including in an arcuate manner, into proximate engagement with the outer touchscreen  1302 . As shown, the first dissipation wall  1417  may be the first (lateral) contact point of any flame resulting from failure of the mobile device  1100 . 
     The first portion  1300  may similarly have a second dissipation wall  1317 . In the event of any remnant flame moving past the first dissipation wall  1417 , the flame will be resisted from passing any further beyond the second dissipation wall  1317 . Still, as a further measure of added redundancy, the second portion may have a third dissipation wall  1418 . One of skill would appreciate the first portion  1300  may have a grooved surface or region to accommodate mating with the first dissipation wall  1417  and the third dissipation wall  1418 . And similarly the second portion  1400  may have a grooved surface or region to accommodate mating with the second dissipation wall  1318 . To the naked eye the first portion  1300  and second portion  1400  may fit seamlessly together. 
     Referring specifically to  FIG. 11B , the first portion  1300  and the second portion  1400  may be configured for assembly together whereby a flame extinguishing (or quenching) path  1509  may be formed. The extinguishing path  1509  may be likened to a path of least resistance. That is, in the event of an explosion within the enclosure  1200 , the resultant flame  1510  travels therein. Like any joint, where the first portion  1300  and second  1400  are coupled together may be the path of flame travel. 
     To meet various standards, such as the more stringent requirements for Class 1 Div I or Zone 1, the enclosure  1200  is required to be able to withstand the effects of an internal combustion or explosion that may produce a flame, which could in turn be an ignition source for various materials that may be associated with the Class 1 Div I or Zone 1. 
     It has been discovered that the flame  1510  (or its energy) may be extinguished or otherwise dissipated by the presence of one or more flame barriers or dissipation walls  1417 ,  1317 ,  1418 . 
     Referring now to  FIG. 12 , a back isometric component breakout view of an explosion proof assembly having a modified second portion, in accordance with embodiments disclosed herein, in shown. 
     While it need not be exactly the same, an assembly  2000  may be like that of assembly of  FIGS. 10A-10F , and components thereof may be duplicate or analogous. Thus, only a brief discussion of the assembly  2000  is provided, recognizing that differences, if any, would be discernable by one of skill in the art, especially in view of the present disclosure. 
     As illustrated, explosion proof assembly  2000  may include a mobile device  2100  associated with a flame extinguishing enclosure  2200 . The enclosure  2200  may include a first or upper portion  2300  configured for releasable coupling to a second or lower portion  2400 . In aspects, the mobile device  2100  may be an iPad® or iPhone® produced by Apple, Inc., including the recent iPhone 8. However, the mobile device  2100  is not meant to be limited, and include other varying types and styles of computer-related devices, including but not limited to those from other manufacturers. 
     In the case of the new iPhone 8, and comparable, the enclosure  2200  may include a rear window  2318 . The use of the rear window  2318  may aid to prevent or mitigate interference with any electromagnetic “wireless” recharging functionality of the mobile device  2100 . Accordingly, the second portion  2400  may have an opening  2419  configured to receive the rear window  2318 . 
     The assembly  2000  may be configured for use in the setting when the upper portion  2300  is sealingly coupled with the lowered portion  2400 , with the mobile device  2100  disposed therein. ‘Sealingly coupled’ may include the portions  2300 ,  2400  being sealingly engaged to certain specification, but some amount of disconnect is permissible. In this sense ‘sealing’ may refer to a metal-to-metal seal. 
     Although not limited, the rear window  2318  may be adhesively and sealingly connected with the second portion  2400 , such as via a layer of an adhesive (not viewable here). The layer of adhesive may provide for a complete perimeter seal between the rear window  2318  and the second portion  2400 . The adhesive may be suitable to withstand changes of significance in temperature, or chemicals, both from internal and external to the enclosure  2200 . 
     Referring now to  FIGS. 13A, 13B, and 13C  together, a top view of a hand-held accessory releasably coupled to a rear side of an explosion proof assembly, a top view of the hand-held accessory of  FIG. 13A , and a side view of a user holding the explosion proof assembly of  FIG. 13A , respectively, in accordance with embodiments disclosed herein, are shown. 
     While it need not be exactly the same, an assembly  3000  may be like that of assembly of  FIGS. 10A-10F, 12 , etc., and components thereof may be duplicate or analogous. Thus, only a brief discussion of the assembly  3000  is provided, recognizing that differences, if any, would be discernable by one of skill in the art, especially in view of the present disclosure. 
     As illustrated, explosion proof assembly  3000  may include a mobile device (not shown here) associated with a flame extinguishing enclosure  3200 . The enclosure  3200  may include a first or upper portion  3300  configured for releasable coupling to a second or lower portion  3400 . In aspects, the mobile device  2100  may be an iPad® or iPhone® produced by Apple, Inc. 
     The assembly  3000  may be configured for use in the setting when the upper portion  3300  is sealingly coupled with the lowered portion  3400 , with the mobile device disposed therein. ‘Sealingly coupled’ may include the portions  3300 ,  3400  being sealingly engaged to certain specification, but some amount of disconnect is permissible. In this sense ‘sealing’ may refer to a metal-to-metal seal. 
     To aid in use of the assembly  3000 , various accessories may be utilized, including those that provide additional grip, shock absorption, hand-holding, and the like. As shown in  FIGS. 13A-13C , an attachable hand-holding accessory  3520  may be coupled to the assembly, such as to the rear side  3411  of the second portion  3400 . 
     Although not limited to any particular hand-holding accessory configuration (and material selection thereof), the accessory  3520  may be made of a nylon-based material. 
     The accessory  3520  may have an attachment backing  3521 , which may be of minimal thickness and generally polygonal in shape. The backing  3521  may be configured for releasable attachment to the rear face  3411 . In this respect, the backing  3521  may have one or more apertures (not viewable here) for receiving a respective attachment fastener  3528  therethrough. As shown, there may be a fastener  3528  inserted through four corner apertures. Accordingly, the second portion  3400  may also have receptacles (not viewable here) that align with the apertures, to which the fastener  3528  may be securely positioned therein. In aspects, the fasteners  3528  may be screwed into the second portion  3400 . 
     It may be desirous to attach and detach the accessory  3520  without having the jeopardize the integrity of the assembled enclosure  3200 . Thus, the receptacles need not have a depth that extends all the way through the thickness of the second portion  3400 . Accordingly, the second portion  3400  may have various raised faces  3530  to accommodate and appreciable amount of material depth to which the fastener  3528  may extend. 
     In other aspects, it may be desirous to disassemble the enclosure  3200  without removing the accessory  3520 . Thus, the accessory  3520  may be shaped in a manner to provide access to enclosure fasteners  3511 . As shown, the accessory  3520  may have one or more arcuate segments  3527 . 
     The accessory  3520  may have a hand hold strap  3522 . The strap  3522  may be movably, yet fixedly connected at strap attachment point  3525 . While not meant to be limited to any particular hand hold configuration, the hand hold strap  3522  may be of sufficient length for inserting into an eyelet  3524 , and then wrapping back over for self-securing to itself, such as via a Velcro layer (e.g., a mini-hook/loop)  3526 . The layer  3526  may be of suitable size to provide adjustment for accommodation of hands of various sizes, as would be apparent to one of skill in the art. 
     As shown in  FIG. 13C , a user  3532  can slide his/her hand into the hand-insertion region  3523 . Using the hand on the back of the enclosure  3520  may provide extra stability as the user  3532  interfaces with the mobile device via outer touchscreen  3302 . 
     For further convenience, a carrying handle  3530  may be coupled to the enclosure  3200 . As illustrated in  FIG. 13A , the handle  3530  may be coupled to the second portion  3400  via handle couplers  3529  on each side of the handle. 
     Referring now to  FIGS. 14A and 14B  together, a top view of a magnetic attachment accessory releasably coupled to a rear side of an explosion proof assembly and a side view of a user using the explosion proof assembly of  FIG. 14B  while magnetically attached to a surface, respectively, in accordance with embodiments disclosed herein, are shown. 
     While it need not be exactly the same, an assembly  4000  may be like that of any assembly disclosed herein, and components thereof may be duplicate or analogous. Thus, only a brief discussion of the assembly  4000  is provided, recognizing that differences, if any, would be discernable by one of skill in the art, especially in view of the present disclosure. 
     As illustrated, explosion proof assembly  4000  may include a mobile device (not shown here) associated with a flame extinguishing enclosure  4200 . The enclosure  4200  may include a first or upper portion  4300  configured for releasable coupling to a second or lower portion  4400 . 
     To aid in use of the assembly  4000 , various accessories may be utilized, including those that provide additional grip, shock absorption, hand-holding, and the like. As shown in  FIGS. 14A-14B , magnetic attachment accessory  4520  may be coupled to the assembly, such as to the rear side  4411  of the second portion  4400 . 
     Although not limited to any particular accessory configuration (and material selection thereof), the accessory  4520  may include various magnetic and non-magnetic components coupled together. As shown in the Figures, the accessory  4520  may include at least on non-magnetic support bar  4532  coupled to raised faces  4531 . The support bar  4532  may have a generally rectangular prism shape 
     The backing support bar(s)  4532  may be configured for releasable attachment to the rear face  4411 . In this respect, the support bar  4532  may have one or more apertures (partially viewable here) for receiving a respective attachment fastener  4528  therethrough. As shown, there may be a fastener  4528  inserted through apertures on each end of the support bar  4532 . Accordingly, the second portion  4400  may also have receptacles (not viewable here) that align with the apertures, to which the fastener  4528  may be securely positioned therein. In aspects, the fasteners  4528  may be screwed into the second portion  4400 . 
     Although a magnet  4544  may be directly coupled to the rear face  4411 , the Figures show the magnet  4544  coupled onto the support bar  4532 . In aspects, there may be a first magnet on one end of the support bar  4532 , and a second magnet disposed on the opposite end of the support bar. An other side of second portion  4400  may have a similar support bar/magnet configuration (e.g., a support bar  4532  on each side, and a magnet on each end of the respective support bar). 
     It may be desirous to attach and detach the accessory  4520  without having the jeopardize the integrity of the assembled enclosure  4200 . Thus, the receptacles need not have a depth that extends all the way through the thickness of the second portion  4400 . Accordingly, the second portion  4400  may have various raised faces  4531  to accommodate and appreciable amount of material depth to which the fastener  4528  may extend and engage therein. As shown the presence of the raised faces  4531  may provide suitable clearance  4533  so that the support bar  4532  does not come into inadvertent contact with enclosure fasteners  4511 . 
     As shown in  FIG. 14B , a user  4532  may magnetically attach the assembly  4000  to a suitable surface, which may provide extra stability as the user  4532  interfaces with the mobile device via outer touchscreen  4302 . Moreover, the user  4532  is now relieved of having to use one hand to hold the assembly  4000 . 
     For further convenience, a carrying handle  4530  may be coupled to the enclosure  4200 . The handle  4530  may be coupled to the second portion  4400  via handle couplers  4529  on each side of the handle. 
     Advantages. 
     Previously operators/users would not be allowed to carry an electronic mobile device with them into hazardous areas (C1D2/Zone2/Zone2/Zone1) as there was no guaranty these devices will not create a spark (i.e., explosion). So they were using pen and paper to do their job (inspection, maintenance, turn arounds, etc.). 
     Embodiments of the disclosure advantageously provide for an explosion proof assembly that may allow operators/users to now carry their mobile devices within an explosion proof assembly of the disclosure. Users can now advantageously and beneficially use customized Apps, take pictures, take videos, and collaborate with their peers, such via Skype or other Apps. Their work is a lot more efficient and is still safe. 
     While embodiments of the disclosure have been shown and described, modifications thereof can be made by one skilled in the art without departing from the spirit and teachings of the disclosure. The embodiments described herein are exemplary only, and are not intended to be limiting. Many variations and modifications of the disclosure presented herein are possible and are within the scope of the disclosure. Where numerical ranges or limitations are expressly stated, such express ranges or limitations should be understood to include iterative ranges or limitations of like magnitude falling within the expressly stated ranges or limitations. The use of the term “optionally” with respect to any element of a claim is intended to mean that the subject element is required, or alternatively, is not required. Both alternatives are intended to be within the scope of any claim. Use of broader terms such as comprises, includes, having, etc. should be understood to provide support for narrower terms such as consisting of, consisting essentially of, comprised substantially of, and the like. 
     Accordingly, the scope of protection is not limited by the description set out above but is only limited by the claims which follow, that scope including all equivalents of the subject matter of the claims. Each and every claim is incorporated into the specification as an embodiment of the present disclosure. Thus, the claims are a further description and are an addition to the preferred embodiments of the disclosure. The inclusion or discussion of a reference is not an admission that it is prior art to the present disclosure, especially any reference that may have a publication date after the priority date of this application. The disclosures of all patents, patent applications, and publications cited herein are hereby incorporated by reference, to the extent they provide background knowledge; or exemplary, procedural or other details supplementary to those set forth herein.