CA1094644A - Self contained window unit for oven doors (common cavity) - Google Patents
Self contained window unit for oven doors (common cavity)Info
- Publication number
- CA1094644A CA1094644A CA302,974A CA302974A CA1094644A CA 1094644 A CA1094644 A CA 1094644A CA 302974 A CA302974 A CA 302974A CA 1094644 A CA1094644 A CA 1094644A
- Authority
- CA
- Canada
- Prior art keywords
- pane
- window unit
- flange
- door
- self
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/76—Prevention of microwave leakage, e.g. door sealings
- H05B6/763—Microwave radiation seals for doors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D21/02—Observation or illuminating devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/18—Door frames; Doors, lids, removable covers
- F27D1/1858—Doors
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electric Ovens (AREA)
- Constitution Of High-Frequency Heating (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A self-contained window unit adapted to be assembled into an oven door, having three glass panes and a microwave shield. Two of the glass panes are held in spaced parallel relation by a frame of electrically-conducting material which has a peripheral mounting flange in electrical contact with the edge of the micro-wave shield. The third pane is secured to the frame by a plurality of individual mounting clips. Fasteners around the four sides of the window unit secure the mounting flange to the door to both mount the window unit and ground the microwave shield.
A self-contained window unit adapted to be assembled into an oven door, having three glass panes and a microwave shield. Two of the glass panes are held in spaced parallel relation by a frame of electrically-conducting material which has a peripheral mounting flange in electrical contact with the edge of the micro-wave shield. The third pane is secured to the frame by a plurality of individual mounting clips. Fasteners around the four sides of the window unit secure the mounting flange to the door to both mount the window unit and ground the microwave shield.
Description
S P E C I F I C A _ I O ~
This invention relates to a self-con-tained three-pane window unit which is equipped with a microwave shield and is thus particularly adapted for use in a microwave oven.
In accordance with the construction to be described, a self-contained window unit for an oven door comprises a window sub-assembly having a pair of glass panes, means to hold the panes in spaced parallel relation, and means for securing a third glass pane to the sub-assembly in a position at one side thereof and in spaced parallel relation to the adjacent glass pane or -the sub-assembly. The securing means provides areas between third pane and the adjacent pane of the sub-assembly at the top and bottom of the window unit defining an opening adapted to communicate with an air passage in the door. The holding means comprises a frame of electrically-conducting material extending about the peripheries of the pair of panes and having a mounting flange. A microwave shield has an edge portion in surface-to-surface ele~trical contact with the mounting flange, and means are provided for securing ~0 the flange to one of the door panels to mount the window unit and ground the shield.
The use of spaced mounting clips for the third pane of the self-contained window unit minimizes thermal con-duction and provides for maximum air flow in the spaces be-tween the clips~
This ~elf-contained window unit is particularly adapted ~or use in microwave ovens equipped for pyrol~tic self-cleaning. No other shielding devices are necessary during the pyrolytic cleaning process.
Other objects and features of this invention will become more apparent as this description proceeds,especially when taken in conjunction with the accompanying drawings wherein:
Fig. 1 is a perspective view with parts broken away and in section of a self-contained window unit embodying the invention.
Fig. 2 is a fragmentary vertical sectional view showing the self-contained window unit of Fig~ 1 mounted in oven door.
Referring now more particularly to the drawings, the self-contained window unit 9 comprises a window sub-assembly 10 having rectangular glass panes 11 and 12 main-tained in spaced paraliel relationship by a spacer 14 and a clamping frame 16. A rectangular front glass pane 18 is secured to the sub-assembly 10 in spaced parallel relation in front of pane 11 by mounting clips 20 along the top, bottom and side edges of the window unit.
A rectangular microwave shielcl 22 parallel to and hetween glass panes 11 and 12 is disposed in surface-to-surface conkact with the inner face of the pane 12. The shield is formed of electrically conducting metal and has nume~o~s perforations of a size to prevent microwave radiation from passing through but large enough to permit the oven chamber to be viewed from the outside.
The spacer 14 is a rectangular member of channel cross section having radially outwardly turned flanges 24 in contact with the inner peripheral surfaces of the glass pane 11 and the shield 22.
The clamping frame 16 is a rectangular member formed of electrically conducting metal. The clamping fr~ e is gener-ally channel shaped in cross section having ~ base 26 extend-ing ac~oss the space between the glass panes 11 and 12 and having laterally inwardly extending retaining flanges 28 and 30 along the outer peripheral surfaces of the panes. Speci-fically, each flange 28,30 has a portion 32 which extends from the base 26 laterally inwardly along the peripheral edge portion of the outer surface of the ~djacent glass pane, and a generally u-shaped terminal portion 34 which opens in-wardly toward the outer surface of the adjacent glass pane.
A strip of asbestos tape 36 lines the inner surface of the base 26 as well as the inner surfaces of the retaining flanges 28 and 30 and is clamped in the terminal portions 34 thereof.
The base of the clamping frame 16 on each of the four sides thereof is divided into front and rear portions 38 and 40 by an integral generally U-shaped section 42 which ex-tends laterally outwardly beyond the base 26 and constitutes a mounting flange. This mounting flange 42 extends continuously along the top, bottom and side edges of the window unit, being interrupted only at the corners as shown in Fig. 1. The reason for the corner intexruptions is that the clamping frame is initially made of a length of stock which is bent into rec-tangular shape.
The microwave shield 22 is both wider and longer than the glass panes 11 and 12 so that it extends outward beyond the peripheries of the glass panes along all four sides.
Thus the peripheral portions of the microwave shield along the top, bottom and side edges project into the U-shaped mounting flange 42. The shield cuts through the asbestos tape.
The top, bottom and side portions of the mounting flange 42 are formed with apertures 44 which extend through both parts of the ~-shaped section~ The tOpr bottom and side peripheral edge portions of the microwave shield received in the mounting -flange are formed with apertures which register with the apert~res 44 in the mounting flangen These apertures are for receiving mounting bolts 46.
The window unit is shown installed in an oven door 48 which has a front door panel 50 and a back door panel 52 and an intermediate panel 54 with insul.ating matarial 56 be-tween the panels 52 and 54. The rear door panel is of elec-trically conducting metal~ The front panel 50 has an annular rearwardly turned flange 56 and the rear panel 52 has an : 20 annular forwardly turned flange 58. The flanges 56 and 58 de-fine registering apertures constituting the opening of the oven door in which the window unit 9 is installed. A front glass pane 60 is clamped to the flange 56 of the front door panel 50 by stops 62 s-ecured to brackets 64 by fasteners 66.
Brackets 64 are secured by any suitable means to the door panel 50 which may be of porcelain,for example. In place of the front panal 50 and glass 60, a full glass front may be employed.
The window unit is mounted in the door within the opening thereof by means of the bolts 46 and a plurality of generally Z-shape~ brackets 68. These bolts 46 and brackets 68 are formed oE electrically conducting metal. Each bracket 68 has one leg welded or otherwise permanently secured in surface-to-surface electrical contact to the inner surface of the rear door panel 52. The other leg is in full surface contact with the mounting flange 42 and has a threaded aper-ture 70. These brackets 68 are arranged around the four sides of the window opening in the oven door in positions to receive the mounting bolts 46 which extend through the apertures in the mounting flange 42 and in the microwave shield 22. The mounting bolts 46 extend through such apertures and thread into the apertures 70 in the brackets 68 to securely mount the window unit to the rear panel of the oven door. The bolt head bears in electrical contact against one side of the mounting flange 42 and clamps the mounting flange in el~c-trical contact with the microwave shield 22 and against the apertured leg of bracket 68.
It will be understood that before the mounting bolts 46 are applied, the width of the space within the mounting flange 42 is greater than the thickness of the microwave shield.
Accordingly, when the bolts 46 are tightened to draw the head of each bolt towaxd the apertured leg of a bracket 68,the mounting flange 42 is compressed into tight electrical con-tact with both sides of the pexi?heral portion of the micro-wave shield, ak the same time drawing the flanges 28 and 30 of the clamping frame 16 toward one another tightly against the outer surface of the glass panes 11 and 12 and this pro-vides a substantially rattle-proof assembly. The edges of the glass panes as well as the outer peripheral surfaces thereof are contacted by the asbestos tape 36 to cushion the assembly thereby preventing breakage, and also forming a seal to keep oven vapors -from escaping.
In use, the mounting by the bolts ~6 and bxacke.ts 68 to the mounting flange a~ points along each of the four sides of the window unit provides a secure mounting for the window unit and also grounds the microwave shield at each mounting po nt. Thus microwave radiation impinging upon the microwave shield at any point on its surface is immediately dissipated through the nearest mounting bolt and bracket to the back panel of the ~oor.
An annular trim riny or moulding 84 of generally J shape in cross section extends around the outer peripheral surface of the rear glass pane 12. The trim ring or moulding 8~ has a radially outwardly extending leg 86 which extends between and contacts the outer peripheral surface of pane 12 and the asbestos tape 36 along a flange portion 32 of the frame 16. An elongated asbestos cord 88 extends within the trim ring and seals against the edge of flange 58 of the inner door panel 52 when the window unit is installed in the door. Instead of asbestos, the cord may be of fiherglass or in the form of a silicone extrusion.
The asbestos strip 36 ~ining the flange portions 32 of the frame 16 engages the outer surface of the front panel 11 and the leg 86 of the trim xing 84, and the spacer flanges 24 engage the inner surface of pane 11 and shield 22 to clamp the window sub-assembly 10 together and -Eorm a sealed package.
The self-contained window unit 9, as before stated, includes in addition to the glass panes 11 and 12 a front glass pane 18 secured ko the sub-assembly 10 by mounting clips 20 spaced apart along the top, bottom and side edges of the window unit. One or more of the cl.ips 20 are provided on each side edge of the window unit and one or more of the clips 20 are provided along the bottom edga and also along the top edge thereof. The clips 20 at the top and bottom of the unit are spaced apart to provide openings communicating with khe air passage 70 between panels 50 and 54 in the door to allow air to flow upwardly between panes 11 and 18. Air, o~ course, also flows upwardly between panes 18 and 60.This dùal air wash across the pane 18 maximizes the dissipation o heat, and the use o~ clips to mount the pane 18 minimizes thermal conduction to pane 18.
Each clip 20 has a plate portion 72 which is secured to the base 26 of the clamping frame 16 as by means of integral tabs 74 on the clamping frame. A leg 76 of the clip 20 projects forwardly from the plate portion 72 across the peripheral edge of the front pane 18 and has a laterally inwardl.y turned ~lange 78 extending ove.r the front periph-sral surface of the front pane 18. A second leg 80 extends forwardly from the plate portion 72 of clip 20 and termi.nates :in a laterally inwardly turned flange 82 which extends over the rear peripheral surface of the pane 18.
The flanges 78 and 82 of clips 20 clamp the front pane 18 against forward or rearward movement. The legs 76 of the clips prevent sidewise as well as upward and down-ward movement of the pane. However, the pane 18 is re-movable from the assembly by bending one or more of the clips laterally outwardly to release the pane. This may or may not result in a deformation of the clips depending upon the springeness of the material from which they are made. In some instances, it is desirable to remove the pane 18 temporarily so that the inner surfaces o~ the panes 11 and 18 may be cleaned. Even if there is some deformation of the clip flanges resultiny from the release and removal of the pane 18, these clip flanges may be bent back into position to retain the cleaned pane 18 after it is re-assembled into the window unit~
The dot-dash line 85 in Fig. 1 illustrates a modi-fied clip construction that may, if desired,be employed along the top edge to make it easier to release and remove the pane 18. In the modified clip cons~ruction, the flange 78 is omitted and the leg 76 terminates at the line 85 so as to extend only park way across the top peripheral edge of the pane 18. In a broad sense, the leg 76 could conceivably ex-tend entixely across the top edge of the pane 18 and even slightly although not appreciably therebeyond. Preferably however, the leg 76 would ~e as shown and termina-te at the line 85 in the drawings. Use of this modified clip con-struction along the top permits easier removal of the pane 18~ The pane may be pressed out~ard at the top a distance sufficient to clear the foreshortened leg 76 and then re-moved by an upward sliding movementO
The type of glass used for the various panes may vary depending upon individual preferences and/or appli-cations. The pane 12 may be of a borosilicate composition for high temperature applications such, for example, as ovens equipped for pyrol~tic self-cleaningO The pane 11 may be of tempered glass with or without a heat reflective coating.
When the self-contained window unit is installed in the door, the microwave shield is positivel~ grounded to the door frame. Moreover,use of the unit in conjunction with a full. or partial glass in the front door panel elim-inates the need for any additional shieldiny device during the pyrolytic cleaning process. The clip type mounting of the pane 18 minimizes thermal conduction and the position of the pane 18 within the door provides a dual air wash which maximizes dissipation of heat.
The pane 18 of the self-contained window unit is removable for cleaning as noted above, after removal of the front door panel 50 either by swinging it down or by separating it completely from the inner door panel, _g_
This invention relates to a self-con-tained three-pane window unit which is equipped with a microwave shield and is thus particularly adapted for use in a microwave oven.
In accordance with the construction to be described, a self-contained window unit for an oven door comprises a window sub-assembly having a pair of glass panes, means to hold the panes in spaced parallel relation, and means for securing a third glass pane to the sub-assembly in a position at one side thereof and in spaced parallel relation to the adjacent glass pane or -the sub-assembly. The securing means provides areas between third pane and the adjacent pane of the sub-assembly at the top and bottom of the window unit defining an opening adapted to communicate with an air passage in the door. The holding means comprises a frame of electrically-conducting material extending about the peripheries of the pair of panes and having a mounting flange. A microwave shield has an edge portion in surface-to-surface ele~trical contact with the mounting flange, and means are provided for securing ~0 the flange to one of the door panels to mount the window unit and ground the shield.
The use of spaced mounting clips for the third pane of the self-contained window unit minimizes thermal con-duction and provides for maximum air flow in the spaces be-tween the clips~
This ~elf-contained window unit is particularly adapted ~or use in microwave ovens equipped for pyrol~tic self-cleaning. No other shielding devices are necessary during the pyrolytic cleaning process.
Other objects and features of this invention will become more apparent as this description proceeds,especially when taken in conjunction with the accompanying drawings wherein:
Fig. 1 is a perspective view with parts broken away and in section of a self-contained window unit embodying the invention.
Fig. 2 is a fragmentary vertical sectional view showing the self-contained window unit of Fig~ 1 mounted in oven door.
Referring now more particularly to the drawings, the self-contained window unit 9 comprises a window sub-assembly 10 having rectangular glass panes 11 and 12 main-tained in spaced paraliel relationship by a spacer 14 and a clamping frame 16. A rectangular front glass pane 18 is secured to the sub-assembly 10 in spaced parallel relation in front of pane 11 by mounting clips 20 along the top, bottom and side edges of the window unit.
A rectangular microwave shielcl 22 parallel to and hetween glass panes 11 and 12 is disposed in surface-to-surface conkact with the inner face of the pane 12. The shield is formed of electrically conducting metal and has nume~o~s perforations of a size to prevent microwave radiation from passing through but large enough to permit the oven chamber to be viewed from the outside.
The spacer 14 is a rectangular member of channel cross section having radially outwardly turned flanges 24 in contact with the inner peripheral surfaces of the glass pane 11 and the shield 22.
The clamping frame 16 is a rectangular member formed of electrically conducting metal. The clamping fr~ e is gener-ally channel shaped in cross section having ~ base 26 extend-ing ac~oss the space between the glass panes 11 and 12 and having laterally inwardly extending retaining flanges 28 and 30 along the outer peripheral surfaces of the panes. Speci-fically, each flange 28,30 has a portion 32 which extends from the base 26 laterally inwardly along the peripheral edge portion of the outer surface of the ~djacent glass pane, and a generally u-shaped terminal portion 34 which opens in-wardly toward the outer surface of the adjacent glass pane.
A strip of asbestos tape 36 lines the inner surface of the base 26 as well as the inner surfaces of the retaining flanges 28 and 30 and is clamped in the terminal portions 34 thereof.
The base of the clamping frame 16 on each of the four sides thereof is divided into front and rear portions 38 and 40 by an integral generally U-shaped section 42 which ex-tends laterally outwardly beyond the base 26 and constitutes a mounting flange. This mounting flange 42 extends continuously along the top, bottom and side edges of the window unit, being interrupted only at the corners as shown in Fig. 1. The reason for the corner intexruptions is that the clamping frame is initially made of a length of stock which is bent into rec-tangular shape.
The microwave shield 22 is both wider and longer than the glass panes 11 and 12 so that it extends outward beyond the peripheries of the glass panes along all four sides.
Thus the peripheral portions of the microwave shield along the top, bottom and side edges project into the U-shaped mounting flange 42. The shield cuts through the asbestos tape.
The top, bottom and side portions of the mounting flange 42 are formed with apertures 44 which extend through both parts of the ~-shaped section~ The tOpr bottom and side peripheral edge portions of the microwave shield received in the mounting -flange are formed with apertures which register with the apert~res 44 in the mounting flangen These apertures are for receiving mounting bolts 46.
The window unit is shown installed in an oven door 48 which has a front door panel 50 and a back door panel 52 and an intermediate panel 54 with insul.ating matarial 56 be-tween the panels 52 and 54. The rear door panel is of elec-trically conducting metal~ The front panel 50 has an annular rearwardly turned flange 56 and the rear panel 52 has an : 20 annular forwardly turned flange 58. The flanges 56 and 58 de-fine registering apertures constituting the opening of the oven door in which the window unit 9 is installed. A front glass pane 60 is clamped to the flange 56 of the front door panel 50 by stops 62 s-ecured to brackets 64 by fasteners 66.
Brackets 64 are secured by any suitable means to the door panel 50 which may be of porcelain,for example. In place of the front panal 50 and glass 60, a full glass front may be employed.
The window unit is mounted in the door within the opening thereof by means of the bolts 46 and a plurality of generally Z-shape~ brackets 68. These bolts 46 and brackets 68 are formed oE electrically conducting metal. Each bracket 68 has one leg welded or otherwise permanently secured in surface-to-surface electrical contact to the inner surface of the rear door panel 52. The other leg is in full surface contact with the mounting flange 42 and has a threaded aper-ture 70. These brackets 68 are arranged around the four sides of the window opening in the oven door in positions to receive the mounting bolts 46 which extend through the apertures in the mounting flange 42 and in the microwave shield 22. The mounting bolts 46 extend through such apertures and thread into the apertures 70 in the brackets 68 to securely mount the window unit to the rear panel of the oven door. The bolt head bears in electrical contact against one side of the mounting flange 42 and clamps the mounting flange in el~c-trical contact with the microwave shield 22 and against the apertured leg of bracket 68.
It will be understood that before the mounting bolts 46 are applied, the width of the space within the mounting flange 42 is greater than the thickness of the microwave shield.
Accordingly, when the bolts 46 are tightened to draw the head of each bolt towaxd the apertured leg of a bracket 68,the mounting flange 42 is compressed into tight electrical con-tact with both sides of the pexi?heral portion of the micro-wave shield, ak the same time drawing the flanges 28 and 30 of the clamping frame 16 toward one another tightly against the outer surface of the glass panes 11 and 12 and this pro-vides a substantially rattle-proof assembly. The edges of the glass panes as well as the outer peripheral surfaces thereof are contacted by the asbestos tape 36 to cushion the assembly thereby preventing breakage, and also forming a seal to keep oven vapors -from escaping.
In use, the mounting by the bolts ~6 and bxacke.ts 68 to the mounting flange a~ points along each of the four sides of the window unit provides a secure mounting for the window unit and also grounds the microwave shield at each mounting po nt. Thus microwave radiation impinging upon the microwave shield at any point on its surface is immediately dissipated through the nearest mounting bolt and bracket to the back panel of the ~oor.
An annular trim riny or moulding 84 of generally J shape in cross section extends around the outer peripheral surface of the rear glass pane 12. The trim ring or moulding 8~ has a radially outwardly extending leg 86 which extends between and contacts the outer peripheral surface of pane 12 and the asbestos tape 36 along a flange portion 32 of the frame 16. An elongated asbestos cord 88 extends within the trim ring and seals against the edge of flange 58 of the inner door panel 52 when the window unit is installed in the door. Instead of asbestos, the cord may be of fiherglass or in the form of a silicone extrusion.
The asbestos strip 36 ~ining the flange portions 32 of the frame 16 engages the outer surface of the front panel 11 and the leg 86 of the trim xing 84, and the spacer flanges 24 engage the inner surface of pane 11 and shield 22 to clamp the window sub-assembly 10 together and -Eorm a sealed package.
The self-contained window unit 9, as before stated, includes in addition to the glass panes 11 and 12 a front glass pane 18 secured ko the sub-assembly 10 by mounting clips 20 spaced apart along the top, bottom and side edges of the window unit. One or more of the cl.ips 20 are provided on each side edge of the window unit and one or more of the clips 20 are provided along the bottom edga and also along the top edge thereof. The clips 20 at the top and bottom of the unit are spaced apart to provide openings communicating with khe air passage 70 between panels 50 and 54 in the door to allow air to flow upwardly between panes 11 and 18. Air, o~ course, also flows upwardly between panes 18 and 60.This dùal air wash across the pane 18 maximizes the dissipation o heat, and the use o~ clips to mount the pane 18 minimizes thermal conduction to pane 18.
Each clip 20 has a plate portion 72 which is secured to the base 26 of the clamping frame 16 as by means of integral tabs 74 on the clamping frame. A leg 76 of the clip 20 projects forwardly from the plate portion 72 across the peripheral edge of the front pane 18 and has a laterally inwardl.y turned ~lange 78 extending ove.r the front periph-sral surface of the front pane 18. A second leg 80 extends forwardly from the plate portion 72 of clip 20 and termi.nates :in a laterally inwardly turned flange 82 which extends over the rear peripheral surface of the pane 18.
The flanges 78 and 82 of clips 20 clamp the front pane 18 against forward or rearward movement. The legs 76 of the clips prevent sidewise as well as upward and down-ward movement of the pane. However, the pane 18 is re-movable from the assembly by bending one or more of the clips laterally outwardly to release the pane. This may or may not result in a deformation of the clips depending upon the springeness of the material from which they are made. In some instances, it is desirable to remove the pane 18 temporarily so that the inner surfaces o~ the panes 11 and 18 may be cleaned. Even if there is some deformation of the clip flanges resultiny from the release and removal of the pane 18, these clip flanges may be bent back into position to retain the cleaned pane 18 after it is re-assembled into the window unit~
The dot-dash line 85 in Fig. 1 illustrates a modi-fied clip construction that may, if desired,be employed along the top edge to make it easier to release and remove the pane 18. In the modified clip cons~ruction, the flange 78 is omitted and the leg 76 terminates at the line 85 so as to extend only park way across the top peripheral edge of the pane 18. In a broad sense, the leg 76 could conceivably ex-tend entixely across the top edge of the pane 18 and even slightly although not appreciably therebeyond. Preferably however, the leg 76 would ~e as shown and termina-te at the line 85 in the drawings. Use of this modified clip con-struction along the top permits easier removal of the pane 18~ The pane may be pressed out~ard at the top a distance sufficient to clear the foreshortened leg 76 and then re-moved by an upward sliding movementO
The type of glass used for the various panes may vary depending upon individual preferences and/or appli-cations. The pane 12 may be of a borosilicate composition for high temperature applications such, for example, as ovens equipped for pyrol~tic self-cleaningO The pane 11 may be of tempered glass with or without a heat reflective coating.
When the self-contained window unit is installed in the door, the microwave shield is positivel~ grounded to the door frame. Moreover,use of the unit in conjunction with a full. or partial glass in the front door panel elim-inates the need for any additional shieldiny device during the pyrolytic cleaning process. The clip type mounting of the pane 18 minimizes thermal conduction and the position of the pane 18 within the door provides a dual air wash which maximizes dissipation of heat.
The pane 18 of the self-contained window unit is removable for cleaning as noted above, after removal of the front door panel 50 either by swinging it down or by separating it completely from the inner door panel, _g_
Claims (20)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A self contained window unit adapted to be assembled into an oven door having front and back panels with aligned window openings therein and means defining an air passage to allow air to flow upwardly through the door and window unit therein, comprising a window sub-assebly having a pair of glass panes, means to hold said panes in spaced parallel relation, a third glass pane, and means for securing said third glass pane to said window sub-assembly in a position at one side thereof and in spaced parallel relation to the adjacent glass pane of said sub-assembly, said securing means providing areas between said third pane and said adjacent pane of said sub-assembly at the top and bottom of said window unit defining an opening adapted to communicate with the air passage in the door to allow the air to flow upwardly therebetween, said holding means comprising a frame of electrically-conducting material extending about the peripheries of said pair of panes and having a mounting flange, a microwave shield having an edge portion in surface-to-surface electrical contact with said flange, and means for securing said flange to one of said door panels to mount said window unit and ground said shield.
2. The self-contained window unit defined in Claim 1, wherein said means for securing said flange com-prises fasteners provided at spaced points along said flange.
3. The self contained window unit defined in Claim 1, wherein said means for securing said third pane to said window sub-assembly comprises a plurality of spaced mounting clips.
4. The self-contained window unit defined in Claim 3, wherein said mounting clips include bottom and side clips at the bottom and side edges of said window unit engaging peripheral portions of said third pane.
5. The self-contained window unit defined in Claim 4, wherein each bottom and side clip has a part ex-tending over the peripheral edge of said third pane and inner and outer flanges extending over the inner and outer peripheral surfaces respectively of said third pane.
6. The self-contained window unit defined in Claim 4, wherein said mounting clips include at least one top clip at the top of said window unit engaging a top peripheral portion of said third pane.
7. The self-contained window unit defined in Claim 6, said top clip having a flange extending over the inner peripheral surface of said third pane,said top clip also having a terminal part extending over the peripheral edge of said third pane but not appreciably therebeyond so as normally to releasably hold said third pane against upward movement but permitting said third pane to be pressed outwardly clear of said terminal part for upward removal.
8. The self-contained window unit defined in Claim 1, wherein said mounting flange extends laterally outwardly beyond said pair of glass panes about sub-stantially the entire peripheries thereof, said edge portion of said microwave shield about substantially the entire periphery thereof being in electrical contact with said flange, and said means for securing said flange com-prises metal fasteners provided at spaced points along the peripheral extent of said flange.
9. The self-contained window unit defined in Claim 1, wherein said frame is generally channel-shaped in cross section having a base extending across the space between said pair of glass panes and laterally inwardly ex-tending retaining flanges engaging the outer peripheral sur-faces thereof, said base being divided into front and rear portions by an integral generally U-shaped section extend-ing laterally outwardly beyond said pair of glass panes about substantially the entire periphery thereof and con-stituting said mounting flange, the edge portion of said microwave shield extending into said U-shaped section, and said means for securing said mounting flange to one of said door panels comprising metal fasteners clamping said edge portion of said microwave shield within said U-shaped section.
10. The self-contained window unit defined in Claim 9, wherein the width of the space within said U-shaped section in its free state condition is greater than the thickness of said shield,said fasteners compressing said U-shaped section into clamping engagement with the edge portion of said shield and also drawing said retaining flanges into pressure contact with the outer peripheral surfaces of said pair of glass panes.
11. The self-contained window unit defined in Claim 3, wherein said mounting clips include top, bottom and side clips at the top, bottom and side edges of said window unit engaging peripheral portions of said third pane.
12. The self-contained window unit defined in Claim 11, said top clip having a flange extending over the inner peripheral surface of said third pane, said top clip having a terminal part extending part way only over the peripheral edge of said third pane so as normally to re-leasably hold said third pane against upward movement but permitting said third pane to be pressed outwardly clear of said terminal part for upward removal.
13. A self-contained window unit adapted to be assembled into an oven door having front and back panels with aligned window openings therein and means defining an air passage to allow air to flow upwardly through the door and window unit therein, comprising a window sub-assembly having a pair of glass panes, means to hold said panes in spaced parallel relation, a third glass pane, and means for securing said third glass pane to said window sub-assembly in a position at one side thereof and in spaced parallel relation to the adjacent glass pane of said sub-assembly, said securing means providing areas between said third pane and said adjacent pane of said sub-assembly at the top and bottom of said window unit defining an opening adapted to communicate with the air passage in the door to allow the air to flow upwardly therebetween, said holding means com-prising a frame of electrically-conducting material extend-ing about the peripheries of said pair of panes and having a mounting flange, a microwave shield extending parallel to said pair of panes and having an edge portion overlying said mounting flange, and means for clamping said edge portion of said shield and said flange together and for securing said flange to one of said door panels to both mount said window unit and ground said microwave shield.
14. An oven door having front and back panels with aligned window openings therein and means defining an air passage to allow air to flow upwardly through the door, a self-contained window unit mounted in said door between said panels in register with the openings therein including a window sub-assembly having a pair of glass panes,means to hold said panes in spaced parallel relation, a third glass pane, means for securing said third glass pane to said window sub-assembly in a position at one side thereof and in spaced parallel relation to the adjacent glass pane of said sub-assembly, said securing means providing areas be-tween said third pane and said adjacent pane of said sub-assembly at the top and bottom of said window unit de-fining an opening adapted to communicate with the air passage in the door to allow the air to flow upwardly therebetween, and a fourth glass pane mounted on one of the door panels in register with the window opening therein and in spaced relation to said third glass pane to provide an opening therebetween communicating with the air passage in the door to allow the air to flow upwardly therethrough.
15. The self-contained window unit defined in Claim 14, wherein said securing means for said third glass pane comprises a plurality of spaced mounting clips.
16. The oven door defined in claim 15, wherein said mounting clips include bottom and side clips at the bottom and side edges of said window unit engaging peripheral portions of said third pane.
17. The oven door defined in Claim 14, wherein said holding means comprises a frame of electrically con-ductive material extending about the peripheries of said pair of panes and having a mounting flange, a micro-wave shield having an edge portion in surface-to-surface electrical contact with said flange, and means for securing said flange to one of said door panels to mount said window unit and ground said shield.
18. The oven door defined in claim 17, wherein said mounting flange extends laterally outwardly beyond said pair of glass panes about substantially the entire peripheries thereof, said edge portion of said microwave shield about substantially the entire periphery thereof being in electrical contact with said flange, and said means for securing said flange comprises metal fasteners provided at spaced points along the peripheral extent of said flange.
19. The oven door defined in Claim 17, wherein said frame is generally channel-shaped in cross section having a base extending across the space between said pair of glass panes and laterally inwardly extending re-taining flanges engaging the outer peripheral surfaces thereof, said base being divided into front and rear portions by an integral generally U-shaped section extending laterally outwardly beyond said pair of glass panes about substantially the entire periphery thereof and constituting said mounting flange, the edge portion of said microwave shield extending into said U-shaped section, and said means for securing said mounting flange to one of said door panels comprising metal fasteners clamping said edge portion of said microwave shield within said U-shaped section.
20. The oven door defined in Claim 19, wherein the width of the space within said U-shaped section in its free state condition is greater than the thickness of said shield, said fasteners compressing said U-shaped section into clamping engagement with the edge portion of said shield and also drawing said retaining flanges into pressure contact with the outer peripheral surfaces of said pair of glass panes.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US79725677A | 1977-05-16 | 1977-05-16 | |
| US797,256 | 1977-05-16 | ||
| US05/898,011 US4206338A (en) | 1976-02-12 | 1978-04-24 | Self-contained window unit for oven doors (common cavity) |
| US898,011 | 1978-04-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1094644A true CA1094644A (en) | 1981-01-27 |
Family
ID=27121846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA302,974A Expired CA1094644A (en) | 1977-05-16 | 1978-05-09 | Self contained window unit for oven doors (common cavity) |
Country Status (7)
| Country | Link |
|---|---|
| AU (1) | AU514736B2 (en) |
| CA (1) | CA1094644A (en) |
| DE (1) | DE2821338A1 (en) |
| FR (1) | FR2391345A1 (en) |
| GB (1) | GB1587337A (en) |
| IT (1) | IT1096089B (en) |
| NL (1) | NL7805234A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3231516A1 (en) * | 1982-08-25 | 1984-03-01 | Schott Glaswerke, 6500 Mainz | GLASS AND / OR GLASS CERAMIC COMPOSITION SYSTEM FOR SHIELDING AGAINST MICROWAVE RADIATION |
| IT8334016V0 (en) * | 1983-04-07 | 1983-04-07 | Zanussi A Spa Industrie | DOOR FOR COMBINED OVEN GAS OR ELECTRIC AND MICROWAVE. |
| DE4118800C3 (en) * | 1991-06-07 | 1995-08-03 | Binder Wtb Labortech Gmbh | Door for a laboratory cabinet, in particular a heating cabinet |
| DE4431619A1 (en) * | 1994-09-05 | 1996-03-07 | Bosch Siemens Hausgeraete | Stove door of a cooker |
| GB2321835B (en) * | 1997-01-30 | 2000-09-13 | Stoves Plc | Cooking ovens |
| DE10314214B4 (en) * | 2003-03-28 | 2021-10-28 | BSH Hausgeräte GmbH | Oven door for closing an oven muffle of an oven |
| WO2010029056A2 (en) * | 2008-09-09 | 2010-03-18 | Arcelik Anonim Sirketi | An oven |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2325773A (en) * | 1940-07-18 | 1943-08-03 | Roper Corp Geo D | Oven observation window construction |
| US3021832A (en) * | 1959-01-12 | 1962-02-20 | Mills Prod Inc | Stove door window unit |
| US3855994A (en) * | 1973-07-16 | 1974-12-24 | Gen Motors Corp | Ventilated windowed oven door |
| US3893442A (en) * | 1974-10-03 | 1975-07-08 | Gen Electric | Oven door with air cooling system |
| US4023554A (en) * | 1976-02-12 | 1977-05-17 | Mills Products, Inc. | Self-contained window unit for oven doors |
| US4049939A (en) * | 1976-04-29 | 1977-09-20 | Mills Products, Inc. | Microwave and radiant window for oven doors |
-
1978
- 1978-05-09 CA CA302,974A patent/CA1094644A/en not_active Expired
- 1978-05-10 AU AU35970/78A patent/AU514736B2/en not_active Expired
- 1978-05-12 FR FR7814268A patent/FR2391345A1/en active Granted
- 1978-05-16 DE DE19782821338 patent/DE2821338A1/en not_active Withdrawn
- 1978-05-16 GB GB19964/78A patent/GB1587337A/en not_active Expired
- 1978-05-16 IT IT23471/78A patent/IT1096089B/en active
- 1978-05-16 NL NL7805234A patent/NL7805234A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| NL7805234A (en) | 1978-11-20 |
| DE2821338A1 (en) | 1978-11-30 |
| AU3597078A (en) | 1979-11-15 |
| IT7823471A0 (en) | 1978-05-16 |
| GB1587337A (en) | 1981-04-01 |
| FR2391345A1 (en) | 1978-12-15 |
| IT1096089B (en) | 1985-08-17 |
| AU514736B2 (en) | 1981-02-26 |
| FR2391345B1 (en) | 1983-08-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |