Patent Publication Number: US-7708008-B2

Title: Double oven combination with an integrated cooling air and exhaust air flow arrangement

Description:
BACKGROUND OF THE INVENTION 
   The invention disclosed herein relates generally to an integrated cooling air and exhaust air flow arrangement for influencing the heat dissipation of a double oven combination, and more particularly to an integrated cooling air and exhaust air flow arrangement having a cooling air only guiding path for guiding cooling air downwardly to a base channel extending below the lower oven of the double oven combination. 
   Cooking appliances have been available, for example, in configurations known as built-in wall ovens and one type of built in oven that is commercially available is a double oven which features two independently operable convection or non-convection ovens. Such double ovens can be installed in a kitchen of a home residence, another room of a home residence, or in other settings in a manner such that one of the pair of ovens is located above the other of the pair of ovens. Moreover, one commercially available configuration of a double oven comprises as well as single control panel element, typically located above the uppermost one of the pair of ovens, that can control the operations of both ovens. 
   Built-in wall ovens can offer advantages such as convenient single-location access for items to be cooked, such as foodstuffs and the like. Additionally, if both ovens are operated in overlapping manner—i.e., foodstuffs are heated in both the upper and lower ovens during overlapping time periods—then the heat produced by both ovens mutually reinforces the heat retention insulative effect that operates to promote good heat retention by the ovens and, thus, less energy consumption by the ovens in producing their heat. While built-in wall ovens can offer advantages such as noted above, there are several factors to consider concerning the installation of built-in units. U.S. Pat. No. 5,957,557 notes that, in the kitchen area, appliances are installed either as upright units or, more widely, as built-in units. U.S. Pat. No. 5,957,557 further notes that appliances which are built in require extensive modifications to the wooden carcass and facings with front panels which match the other kitchen units. U.S. Pat. No. 5,957,557 further describes other perhaps detrimental aspects of such built-in units, including the fact that wood is sensitive to dampness and the effects of heat and the requirement to provide each appliance with its own power supply, often requiring installation to be carried out by a specialist electrician. Moreover, U.S. Pat. No. 5,957,557 notes that the electrical appliances of such built-in units are generally not stackable for static reasons. 
   U.S. Pat. No. 6,166,353 discloses a free-standing warming appliance 10 that can optionally be provided with a pair of oven support members 210 to directly support a built-in oven 14 and, in this respect, the free-standing warming appliance 10 and built-in oven 14 supported thereon may present one solution for installing a built-in unit. Each of the oven support members 210 is inverted-U-shaped in cross section and has inner walls that form a plurality of spaced-apart engagement arms 218 with mounting tabs 220 provided at their lower ends. The tabs 220 are sized to be inserted into a plurality of spaced-apart and collinear slots 222 formed in the top panel 76 of a warming drawer. 
   According to U.S. Pat. No. 6,166,353, each of its support members 210 is attached to the warmer drawer chassis 20 by inserting the tabs 220 into the slots 222 in the outer enclosure top panel 76 so that the arms 218 engage the top panel 76. Screws are then inserted to attach the outer wall 216 to the outer enclosure lateral walls 70, 72. It is readily apparent from the above description that the support members 210 can be installed and removed with access to only the lateral sides of the warming appliance 10. With each of the support members 210 attached to the warming appliance 10, the top walls 210 of the support members 210 are generally parallel and spaced-apart to form a generally horizontal support plane 223 for the built-in oven 14. As shown in FIG. 14 of U.S. Pat. No. 6,166,353, the oven 14 rests directly on the support member top walls 212 within a cabinet in a kitchen. Therefore, the free-standing warming appliance 10 directly supports the built-in oven 14. 
   Additionally, as shown in FIGS. 1 and 15 of U.S. Pat. No. 6,166,353, the free-standing warming appliance 10 can optionally be provided with a pair of cabinet support brackets 224. each having a generally planar main wall 226 and a tab 228 extending generally perpendicularly therefrom. The tabs 228 provide forward facing engagement surfaces that engage the rear surface of a cabinet front panel of a kitchen to prevent the chassis 20 of the warming appliance 10 from being pulled out of the cabinet 12 when the warmer drawer 22 is pulled out of the chassis 20. 
   A common design consideration that must be taken into account for all built in double oven installation scenarios is that an appropriate flow of cooling air and an appropriate removal of heated exhaust air must be provided for a number of reasons. For example, such cooling air flows and heated exhaust air removal must be arranged such that the selected cooking temperatures in the ovens are maintained. In connection with maintaining the selected oven cooking temperatures, it is typically provided that a predetermined quantity of heated exhaust air is removed from an oven. This removed heated exhaust air often comprises entrained cooking residues such as food particulates, steam vapor, grease matter, and other substances and the heated exhaust air must then be guided away from the ovens such that these substances do not contact and accumulate upon, for example, electrical wiring, is located next to the ovens. Additionally, it is frequently desired to introduce cooling air—in the form of air at the ambient temperature of the kitchen or other room in which the double ovens are located—to thereby achieve cooling of selected components of the double oven. For example, one design constraint is that oven door outer surfaces including oven door handles must not exceed a specified temperature. Thus, there is a need to provide, with respect to built-in units comprised of household appliances, and, in particular, a built in double oven, a cooling air and exhaust air flow arrangement for efficiently guiding exhaust air away from the upper oven and the lower oven while at the same time effectively flowing cooling air relative to the double oven combination to promote desired cooling of the double oven combination. 
   SUMMARY OF THE INVENTION 
   According to one aspect of the present invention, there is provided an integrated cooling air and exhaust air flow arrangement for influencing the heat dissipation of a double oven combination formed of two ovens arranged with one oven above and relatively proximate to the other oven. The an integrated cooling air and exhaust air flow arrangement includes a first air guiding path for guiding a mixture of cooling air and air that has been exhausted from the upper oven, a second air guiding path for guiding a mixture of cooling air and air that has been exhausted from the lower oven, and a cooling air only guiding path for guiding cooling air with all of the first guiding air guiding path, the second air guiding path, and the cooling air only guiding path guiding their respective air mixtures downwardly to a base channel extending below the lower oven. The second air guiding path includes a mid-channel formed above the lower oven and below the upper oven with cooling air entering the mid-channel from outwardly of the upper and lower ovens and mixing in the mid-channel with heated air that has exited a top portion of an oven door that selectively closes and permits access to an access opening of an oven cavity of the lower oven. Also, the cooling air only guiding extends from the cooling air entry above the upper oven to the base channel extending below the lower oven and the cooling air only guiding path is segregated from the first air guiding path and the second air guiding path. 
   In accordance with further details of the one aspect of the present invention, the integrated cooling air and exhaust air flow arrangement additionally includes a latch plate shield located above the access opening of the oven cavity of the lower oven and below the upper oven. 
   In accordance with yet further details of the one aspect of the present invention, the latch plate shield is cooperatively configured with respect to the top portion of the oven door of the lower oven for influencing heated air exiting the top portion of the oven door to enter the mid-channel of the second air guiding path and latch plate shield assembly including at least one cooling air aperture for the entry of cooling air into the mid-channel of the second air guiding path, whereby the integrated cooling air and exhaust air flow arrangement efficiently guides exhaust air away from the upper oven and the lower oven while at the same time effectively flowing cooling air relative to the double oven combination to promote desired cooling of the double oven combination. 
   In accordance with further details of the one aspect of the present invention, the latch plate shield includes a protruding bill element that protrudes outwardly in the direction toward the area of the structure in which the double oven is installed. Additionally, the protruding bill element includes an outermost edge that extends nearly to an inside surface of the oven door of the lower oven when the oven door is in its oven cavity closing disposition. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a perspective view of a self-cleaning oven; 
       FIG. 2  is a front plan view of the oven of  FIG. 1 ; 
       FIG. 3  is an exploded perspective view of an oven door assembly; 
       FIG. 4  is a perspective view of a V-shield; 
       FIG. 5  is a perspective view of a glass pack shield; 
       FIG. 6  is an exploded view of the glass pack shield of  FIG. 5 ; 
       FIG. 7A  is an enlarged perspective view of a not yet engaged tab and slot engagement in accordance with one aspect of the glass pack shield; 
       FIG. 7B  is an enlarged perspective view of an engaged tab and slot engagement in accordance with one aspect of the glass pack shield; 
       FIG. 8  is a perspective view of a nose latch plate; 
       FIG. 9  is a front plan view of a double oven combination configured to be installed as a built-in combination in an area of a household; 
       FIG. 10  is a rear perspective view in partial section of the built-in double oven combination shown in  FIG. 9 ; 
       FIG. 11  is a perspective view of the built-in double oven combination shown in  FIG. 9  and showing portions of decorative elements of the household area; 
       FIG. 12  is a front perspective view in partial section of the built-in double oven combination shown in  FIG. 9 ; 
       FIG. 13  is a rear perspective view in partial section of the built-in double oven combination shown in  FIG. 9  and showing outer housing portions of the double oven combination; and 
       FIG. 14  is an enlarged perspective view of a portion of the nose latch plate shown in  FIG. 8 . 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   Referring now to  FIGS. 1 and 2 , an electric or gas oven or range  10  (“oven” is used for ease of reference hereinafter) is operable to cook and heat foodstuffs and other substances. Two units of the oven  10  can be arranged relative to one another to form a double oven combination and, additionally, such a double oven combination can be configured to be “built-in” double oven that is installed in a recessed manner in, for example, an area of a household—in other words, permanently secured relative to the household area and integrated with other elements of the household area to provide a consistent decorative appearance. Such a double oven combination may be comprised of two ovens each of which is a unit configured identically to the oven  10  described hereinabove with one of these ovens being an upper oven disposed at a predetermined spacing above the other oven (the lower oven) and can include an associated single control panel for controlling the operation of both the upper and lower ovens. 
   Continuing then with a description of the oven  10 , the oven  10  can be operable as either an upper oven or a lower oven and includes a frame  16 , with an oven cavity  18  closed by an oven door assembly  20 . The oven door assembly  20  includes a window  22  for the user to view the inside of the oven cavity  18 , such as to view food cooking in the oven cavity  18 . As seen in  FIG. 9 , a plurality of door flow exit apertures  24  are formed in the top surface of the door  20 . The operation of the oven cavity  18  is controlled by the user utilizing the associated single control panel. A self-cleaning operation of the oven cavity  18  is controlled by operation of the associated single control panel. 
   With reference to  FIG. 2 , the oven cavity  18  generally has side walls  26  and  28 , a top wall  30 , a bottom wall  32 , and a back wall  34 . In the immediate vicinity of the top wall  30 , where the oven is an electric oven, an interior or broil heating element (resistance coil)  36  can be disposed for grilling or broiling. The broil heating element  36  can be of any heating element known in the art and is in contact with a plug  38 , for example, or another type of connecting element through its electrical terminals. In a gas oven, it is understood that gas burners within the oven cavity will be connected with a source of gas. An impeller or fan  42  can be located in the vicinity of back wall  34  for conducting air circulation within oven cavity  18 . 
   Various embodiments of an oven door heat dissipation system will now be described with reference to  FIG. 3 . Oven door assembly  20 , shown in an exploded perspective view in  FIG. 3 , may include an outside door panel  52  preferably including a glass pane  54  (for viewing the contents of oven cavity  18 ). Outside door panel  52  and glass pane  54  may be susceptible to excessive temperature from within oven cavity  18 , generated for example by element  36  during the oven&#39;s self-cleaning cycle. Oven door assembly  20  may also include an inside door panel  62  preferably including a glass pane  64  and that of which forms the inner most component of oven door assembly  20  closest to oven cavity  18 . Oven door assembly  20  may also include at least one middle glass pane  72  which is sandwiched between outside door panel  52 , inside door panel  62 , and other components within oven door assembly  20 . Various aspects of the present invention also included in oven door assembly  20  and discussed in further detail below include an air deflection assembly  100  and a glass pack shield  200 .  FIG. 3  also shows a latch plate shield  300  that will be described in more detail hereinbelow. 
   The glass pane  72  is subject to the convection heat of the oven, which may typically be in the range of 300 degrees Fahrenheit up to 500 degrees Fahrenheit. With particular reference now to  FIGS. 3 and 4 , the air deflection assembly  100  is suitably positioned to promote the transfer of heat away from the glass pane  72  and the air deflection assembly  100  is configured to promote the transfer of heat away from the glass pane  72  via deflecting a first portion of an entry air stream of air  98  from outside the oven into a first branch path  102 A and deflecting a second portion of the entry air stream  98  into a second branch path  102 B. The door riser extent  104 A of the first branch path  102 A is formed of a paralleliped-shaped configuration forming an air passage. The door riser extent  104 B of the second branch path  102 B is formed as well of a paralleliped-shaped configuration. 
   As seen in  FIG. 4 , the respective door riser extents  104 A,  104 B are each formed with a lower entry aperture  110 A,  110 B, respectively, through which the respective first or second portion of the entry air stream  98  that has been diverted into the respective branch path  102 A,  102 B, enters the respective door riser extent  104 A,  104 B. Each of the door riser extents  104 A,  104 B is provided with a capped bottom portion  112 A,  112 B, respectively and, as seen in  FIG. 4 , a complementary riser portion  114 A,  114 B, is provided to both provide structural support for the oven door assembly and, as well, to generally block an open slot  116  formed in each door riser extent  104 A,  104 B. 
   As seen in  FIG. 3 , the air deflection assembly  100  is disposed intermediate the outer door panel  52  and the glass pane  72  and, accordingly, the air deflection assembly  100  is suitably positioned to promote the transfer of heat away from the glass pane  54 . Specifically, as the air deflection assembly  100  receives the relatively more cooler entry air stream  98  and guides the respective first and second portions of this entry air stream along the first branch path  102 A and the second branch path  102 B, the relatively higher temperature of the glass pane  72  results in a transfer of heat between the glass pane  72  and the air streams flowing through the door riser extents  104 A and  104 B. This effect results in a cooling of the glass pane  54 . 
   With reference to  FIGS. 5 ,  6 ,  7 A and  7 B, the glass pack shield  200  can be provided in oven door  20  to further assist in the dissipation of heat away from the various components of oven door  20 , in order to minimize the surface temperature found on outside door panel  52  and the associated glass pane  54 . As is known in the art, interior glass panes, such as glass pane  72 , may so obstruct the flow of cooling air through the interior region of door assembly  20  that the area of outside door panel  52  and associated glass pane  54  may not receive sufficient convective cooling and may be susceptible to the generation of unacceptable temperatures at their adjacent outside surfaces. Accordingly, a heat collecting and dissipation system would assist in cooling the interior region of door assembly  20 . Glass pack shield  200  is designed for several functions including the ability to act as a heat sink to draw heat from glass pane  72 , which it is in contact with a portion of glass pack shield  200 , and channel that heat, such as through air currents, to slots (not shown) in a wall  66  of inside door panel  62  in order for the heat to flow back into oven cavity  18   
   Referring to  FIGS. 5 and 6 , glass pack shield  200  is preferably constructed of a plurality of elongate members, such as top member  210 , bottom member  220 , left member  230 , and right member  240 . While glass pack shield  200  as shown in  FIGS. 5 and 6  includes a pair of long leg members  210 ,  220  and a pair of short leg members  230 ,  240  which form a generally rectangular shape, it is envisioned that glass pack shield  200  may include any number of a plurality of elongate members to form a variety of shapes. Elongate members  210 ,  220 ,  230 ,  240  can be fixedly attached to one another, such as through spot welding or through the use of fasteners, or can be removably attached as discussed in more detail herein below. 
   Referring further to  FIG. 5 , elongate members  210 ,  220 ,  230 ,  240  are constructed in a manner to provide maximum heat dissipation and air flow across their surfaces. Since top member  210  and bottom member  220  can be substantially similar and left member  230  and right member  240  can also be substantially similar, the structure of these members will be discussed with reference to bottom member  220  and left member  230 , respectively. 
   As shown in  FIG. 5 , each elongate member can include a planar stand-off portion  222 ,  232  which functions to stand glass pack shield  200  off of wall  66  of inside panel  62 . The distance of this stand off and thus the height of stand-off portion  222 ,  232  is configured to promote good heat dissipation and stand-off portion  222 ,  232  is typically arranged in a perpendicular manner to wall  66  of inside door panel  62 . Each elongate member further comprises a planar central portion  224 ,  234  which is connected to the edge of stand-off portion  222 ,  232  opposite that of wall  66 . Central portion  224 ,  234  typically extends from stand-off portion  222 ,  232  in a substantially perpendicular manner outwardly toward side wall  68  of inside door panel  62 . When door assembly  20  is assembled, central portion  224 ,  234  typically is in contact with glass pane  72  and is able to draw heat therefrom. 
   In order to influence heated air currents, such as air currents A shown in  FIG. 5 , each elongate member further comprises a planar angular fin  226 ,  236  which is connected to the edge of central portion  224 ,  234  opposite that of where central portion  224 ,  234  connects to stand-off portion  222 ,  232 . Angular fin  226 ,  236  typically extends from central portion  224 ,  234  at an angle away from stand-off portion  222 ,  232  and downwardly toward wall  66  of inside door panel  62 . 
   As shown with reference to bottom member  220  in  FIG. 5 , individual elongate members may additionally include a second fin  228  which is connected to the edge of fin  226  opposite that of where fin  226  connects to central portion  224 . Second fin  228  typically extends from fin  226  in the same general direction as fin  226  but at less of an angle. 
   As discussed hereinabove, elongate members  210 ,  220 ,  230 ,  240  can be fixedly attached to one another, or can be removably attached to one another in order to simplify the construction process. With reference to  FIGS. 6 ,  7 A and  7 B, elongate members  210 ,  220 ,  230 ,  240  can be removably attached or engaged to one another, and disengaged from one another, through the use of a tab and slot arrangement. As shown, top member  210  and bottom member  220  can have a tab portion  252  on each opposing end and left member  230  and right member  240  can have a slot  254  on each opposing end. 
   During assembly of glass pack  200 , top member  210  and bottom member  220  are positioned so that left member  230  and right member  240  are arranged in a corresponding relationship. Once positioned, each tab portion  252  on top member  210  and bottom member  220  is engaged with an associated slot  254  on left member  230  and right member  240 . In this manner, elongate members  210 ,  220 ,  230 ,  240  are interconnected to form glass pack shield  200 . It is understood that as opposed to the arrangement shown and described, left member  230  and right member  240  may include tab portion  252  and top member  210  and bottom member  220  may include slot  254 , or a mixture of both. It is further envisioned that elongate members  210 ,  220 ,  230 ,  240  can be removably attached through other means such as snap-fit connections, press-fit connections, etc. 
   As discussed hereinabove, door assembly  20  can be cooled through the use of circulating cooling air that acts as a heat sink picking up heat from various components throughout the door assembly for subsequent discharging and removal. Referring to  FIG. 5 , such air may include air currents A which comprise air flows around glass pack shield  200  and in between middle glass pane  72  and inside door panel  62 . In operation, planar central portion  224 ,  234  is typically in contact with glass pane  72  and is able to draw heat therefrom. This heat can be further directed down planar angular fin  226 ,  236  and second fin  228  if present. Air currents A which are passing around elongate members  210 ,  220 ,  230 ,  240  can pick up drawn heat and channel such heat out the door flow exit apertures  24 , which are preferably formed on the inside door panel  62  along the top perimeter side wall  68  thereof. Once air currents A exit the door flow exit apertures  24  formed on the inside door panel  62 , these air currents may then be directed toward and then through the latch plate  300 . 
   Glass pack shield  200  is preferably made of a material that will withstand the high temperatures produced within oven cavity  18  without cracking or breaking. Metals, ceramics, and even some high temperature plastics are contemplated as suitable materials. Preferably, glass pack shield  200  is made of a heat conducting material that easily reflects and/or dissipates heat to the surrounding air. Metals are the preferred material for construction of glass pack shield  200 , with steel being the preferred metal. A coating to protect the metal from corrosion at high temperatures is preferably used. Most commonly, steel is coated with another metal that is more reactive in the electromotive series, so that, in the presence of an electrolyte, such as humid air, the coating metal rather than the steel is affected. Zinc (galvanizing) or aluminum coating of the steel are the most preferred coatings, but any coating may be used that will reduce rapid corrosion that is possible from high temperature oxidation. It is also envisioned that glass pack shield  200  may be made of anodized aluminum which typically has high heat reflectivity characteristics, as well as lightweight characteristics. In addition, aluminum is an excellent radiator and spreader of the heat that does pass through glass pack shield  200 , which is especially beneficial in transferring heat from glass pack shield  200  to air stream A provided over the outer surface of glass pack shield  200  to assist in cooling the door. 
   Reference is now had to  FIG. 9 , which is a front plan view of a double oven combination configured to be installed as a built-in combination in an area of a household,  FIG. 10 , which is a rear perspective view in partial section of the built-in double oven combination shown in  FIG. 9 , and  FIG. 11 , which is a perspective view of the built-in double oven combination shown in  FIG. 9  and showing portions of decorative elements of the household area. As noted, two units of the oven  10  can comprise the double oven combination—hereinafter generally designated as the double oven combination  510 —and this double oven combination  510  is configured to be “built-in” an area of a household—in other words, permanently secured relative to the household area and integrated with other elements of the household area to provide a consistent decorative appearance. The double oven combination  510  shown in  FIGS. 9 and 10  comprises two ovens each of which is a unit configured identically to the oven  10  described hereinabove with one of these ovens being denominated as an upper oven  512  and a lower oven  514 . The double oven combination  510  further comprises a control panel  516 . The upper oven  512  and the lower oven  514  are each configured as a convection oven that cooks and heats food and other substances via radiant and convective heating. 
   As seen in particular in  FIG. 10 , the double oven combination  510  has an integrated cooling air and exhaust air flow arrangement, generally designated as the integrated air flow arrangement  518 , for efficiently guiding exhaust air away from the upper oven  512  and the lower oven  514  while at the same time effectively flowing cooling air relative to the double oven combination  510  to promote desired cooling of the double oven combination  510 . 
   As seen in  FIG. 11 , the double oven combination  510  can be suitably attached to an appropriate mounting structure in, for example, a kitchen of a residential home or in another setting. In this regard, it is may be desirable that the double oven combination  510  be mounted in a recessed disposition, whereby a front fascia  520  of the control panel  516 , as well the respective fronts of the upper oven  512  and the lower oven  514 , are substantially parallel to and, if desired, flush, with certain decorative elements of the portion of a kitchen in which the double oven combination  510  is installed, such as, for example, a decorative element in the form of a decorative panel  522 . The installed disposition of the double oven combination  510  in a recessed manner relative to certain decorative elements of the kitchen results in certain structural support elements and decorative elements of the kitchen being in relatively close proximity to the bottom, sides, rear, and top sides of the double oven combination  510 . This multiplicity of adjacent elements of the kitchen and the double oven combination  510  imposes a particular need to provide a competent arrangement for efficiently guiding exhaust air away from the upper oven and the lower oven while at the same time effectively flowing cooling air relative to the double oven combination to promote desired cooling of the double oven combination and the integrated air flow arrangement  518  is particularly configured to handle this need. 
   As seen in particular in  FIG. 10 , the integrated air flow arrangement  518  integrates a plurality of air guiding structures configured to guide cooling air relative to the double oven combination  510  with a plurality of exhaust structures configured to guide exhaust air from the ovens. As seen in  FIG. 12 , which is a front perspective view in partial section of the built-in double oven combination  510 , and  FIG. 13 , which is a rear perspective view in partial section of the built-in double oven combination  510 , cooling air in the form of air at the ambient kitchen temperature is drawn in the double oven combination  510  via several entry locations, this drawn-in cooling air is selectively combined with exhaust air exiting the oven cavities of the upper oven  512  and the lower oven  514  via respective dedicated exhaust duct structures, the combined cooling air and exhaust air streams are ultimately combined with a cooling air only stream at a base channel  524  below the lower oven  514 , and all of these air streams then exit the double oven combination  510  at an floor grille exit element  526  near the floor of the kitchen. 
   As seen in  FIGS. 12 and 13 , a lower cooling air stream  528  in the form of air at the ambient kitchen temperature is drawn in the double oven combination  510  via the nose latch plate of the lower oven  514  and an upper cooling air stream  528  in the form of air at the ambient kitchen temperature is drawn in the double oven combination  510  via the nose latch plate of the upper oven  512 . The lower cooling air stream  528  is immediately combined with exhaust air exiting the top of the oven door of the lower oven  514  once the lower cooling air stream  528  has passed through the nose latch plate of the lower oven  514  and this combined cooling air-exhaust air stream flows in a rearward direction in a between oven channel  530  located above the lower oven  514  and below the upper oven  512 . A lower fan unit  532  provides motive power for promoting rearward movement of the combined cooling air-exhaust air stream in the channel  530  and additionally promotes downward movement of the combined cooling air-exhaust air stream along a mid-rise back channel  534  extending between the channel  530  and the base channel  524 . The mid-rise back channel  534  is in the form of a duct structure formed by an interior back wall  536  of the lower oven  514  and an outer housing element  538 , as seen in  FIG. 13 . 
   As seen in  FIGS. 12 and 13 , the upper cooling air stream  529  in the form of air at the ambient kitchen temperature is drawn in the double oven combination  510  via the nose latch plate of the upper oven  512  and flows rearwardly along a top channel  540  toward an upper fan unit  542 . Exhaust air exits the upper oven  512  via a plenum  544  and combines with the upper cooling air stream  528  shortly upstream of the upper fan unit  542 . The upper fan unit  542  provides motive power for promoting downward movement of the combined cooling air-exhaust air stream along a top-rise back channel  546  extending between the top channel  540  and the base channel  524 . The top-rise back channel  546  is in the form of a duct structure formed by an interior back wall  550  of the upper oven  512  and an outer housing element  548 , forming an upper duct portion, and the interior back wall  536  of the lower oven  514  and the outer housing element  538 , forming a lower duct portion, as seen in  FIG. 13 . 
   Cooling air also flows along a cooling air only flow path  552  formed between the interior back wall  550  of the upper oven  512 , the outer housing element  548 , the interior back wall  536  of the lower oven  514 , and the outer housing element  538  and this cooling air only flow path  552  comprises cooling air that has entered the double oven combination  510  via the upper cooling air stream  529  but which has not combined with exhaust air exiting the upper oven  512  via the plenum  544 . Such cooling air flows downwardly in the volume bounded by the interior back wall  550  of the upper oven  512 , the outer housing element  548 , the interior back wall  536  of the lower oven  514 , and the outer housing element  538  outside of, or exterior to, the mid-rise back channel  534  and the top-rise back channel  546 . The cooling air flowing along the cooling air only flow path  552  ultimately flows into the base channel  524  to combine with each of the combined cooling air-exhaust air stream exiting the mid-rise back channel  534  and the top-rise back channel  546  and, thereafter, to exit the double oven combination  510  via the floor grille exit element  526 . 
   With particular reference now to  FIG. 12 , it can be seen that the latch plate shield  300  is located above the oven cavity of the lower oven  514  and at a top front portion of the frame  16  of the lower oven. The latch plate shield  300  is particularly configured to guide the air exiting the door  20  of the lower oven  514  into the between oven channel  530  located above the lower oven  514  and below the upper oven  512  while, at the same time, guiding cooling air into the between oven channel  530 . As seen in  FIG. 8 , the latch plate shield  300  is preferably formed of steel, stainless steel, or other suitable steel or alloy material that is formed with selected apertures and geometric configurations. The latch plate shield  300  includes an elongate protruding bill element  302  that protrudes outwardly (in the direction toward the household area in which the double oven is installed) and the extent of this outward protrusion (i.e., the depth) of the protruding bill element  302  is selected such that an outermost edge  304  of the protruding bill element  302  extends nearly to the inside surface of the door  20  of the lower oven  514  when the door  20  of the lower oven  514  is in its oven cavity closing disposition. Additionally, the latch plate shield  300  is mounted on the frame  16  of the lower oven  514  such that the outermost edge  304  of the protruding bill element  302  is slightly vertically lower than the top surface of the door  20  of the lower oven  514 —that is, the uppermost horizontal surface of the door  20  of the lower oven  514  when the door  20  is in its oven cavity closing disposition. The latch plate shield  300  also includes a plurality of door air receipt apertures  316  ( FIG. 14 ) formed in the latch plate shield  300  below the protruding bill element  302 , a latch hook through hole  306  formed longitudinally centrally in the latch plate shield  300  below the protruding bill element  302 , and a plurality of cooling air entry apertures  308  formed above the protruding bill element  302 . A latch hook (not illustrated) extends through the latch hook through hole  306  to engage corresponding latching structure (not illustrated) on the door  20 . 
   Air that has passed through the interior of the door  20  of the lower oven  514  has acquired more heat content, as has been described hereinabove with respect to the operations of the air deflection assembly  100  and the glass pack shield  200 , and the heated air ultimately exits the door  20  of the lower oven  514  through the plurality of door flow exit apertures  24  formed in the top surface of the door  20  of the lower oven  514  The configuration of the protruding bill element  302  and its installed disposition relative to the door  20  of the lower oven  514  leads to the effect that heated air exiting the door  20  via door flow exit apertures  24  formed in the top surface of the door  20  is deflected or guided by the protruding bill element  302  to flow through the latch plate shield  300  and thereafter into the between oven channel  530 . 
   As seen in  FIG. 14 , which is an enlarged perspective view of a portion of the nose latch plate shown in  FIG. 8 , the protruding bill element  302  is formed as an elongate portion having an underside extent  312  and a topside extent  314 . The underside extent  312  and a topside extent  314  together form the outermost edge  304  and the underside extent  312  and a topside extent  314  form an included acute angle UT. A plurality of underside apertures  316  are formed on the underside extent  312  of the protruding bill element  302  and each of these underside apertures  316  may have any desired shape such as, as is illustrated in  FIG. 14 , an elongate shape. The underside apertures  316  extend completely through the underside extent  312  of the protruding bill element  302  and operate to permit the passage therethrough of heated air exiting the door  20  via door flow exit apertures  24  formed in the top surface of the door  20 . Heated air that has passed through these underside apertures  316  thereafter passes into oven channel  530 . Thus, it can be understood that the protruding bill element  302  promotes the flow of heated air exiting the door  20  via door flow exit apertures  24  formed in the top surface of the door  20  through either the door air receipt apertures  306  of the latch plate shield  300  or the underside apertures  316  extending through the underside extent  312  of the protruding bill element  302 . 
   The cooling air entry apertures  308  formed above the protruding bill element  302  are arranged relative to the protruding bill element  302  such that cooling air in the form of ambient room temperature air is guided by the protruding bill element  302  toward and then into the cooling air entry apertures  308 , whereupon the cooling air thereafter enters into oven channel  530  to mix therein with the heated air that has exited the door  20  and subsequently been guided by the latch plate shield  300  into oven channel  530 . 
   It will be understood that various details of the present invention may be changed without departing from the scope of the present invention. Furthermore, the foregoing description is for the purpose of illustration only, and not for the purpose of limitation, as the present invention is defined by the claims as set forth hereinafter.