Shielded window arrangement for a heat cleaning oven door

Claim 2

In a door for enclosing a heat-cleaning oven, the combination comprising a front panel, a rear panel and an intermediate panel each having registering window openings in the upper half thereof, said front panel and said intermediate panel being spaced apart to define a lower well below the window level and an upper pocket above the window level, an outer glass sheet covering the window opening in said front panel, at least one inner glass sheet covering the window openings in said intermediate panel and said rear panel, a movable flat plate shield in said well of a dimension larger than the window openings having a reflective surface adapted to face said oven, means for raising and lowering said shield from said well into an air flow space between said outer glass sheet and said inner glass sheet, said shield in its raised window blocking position dividing the air flow space into front and rear vertical positive convection flow air channels, said raised shield being spaced closer to said outer glass sheet than to said inner glass sheet whereby said rear channel depth is comparatively large relative to said front channel depth, said front panel having ambient air inlet openings adjacent its lower edge and air outlet openings adjacent its upper edge providing a continuous air flow passage communicating between the lower well, the air flow space and the upper pocket; a laminar air flow panel positioned in the upper pocket in substantial alignment with said outer glass sheet, said shield when in its raised window blocking position extending upwardly with its upper portion in spaced rearward lapping relation with the lower portion of said laminar panel, said laminar panel dividing the upper pocket into front and rear laminar flow air ducts of substantially equal air flow capacity whereby the ambient air flowing in said front channel after air washing the front side of said shield and the back side of said outer glass sheet is distributed between said front and rear ducts while the ambient air flowing in said rear channel after air washing the back side of said shield and the front side of said inner glass sheet flows upwardly through said rear duct such that said front panel and the front side of said outer glass sheet are maintained at reduced temperatures during a heat-cleaning operation in said oven.

Claim 3

In a door for enclosing a heat-cleaning oven, the combination comprising a front panel, a rear panel and an intermediate panel each having registering window openings in the upper half thereof, said front panel and said intermediate panel being spaced apart to define a lower well below the window level and an upper pocket above the window level, an outer glass sheet covering the window opening in said front panel, at least one inner glass sheet covering the window openings in said intermediate panel and said rear panel, a movable flat plate shield in said well of a dimension larger than the window openings having a reflective surface adapted to face said oven, means for raising and lowering said shield from said well into an air flow space between said outer glass sheet and said inner glass sheet, said shield in its raised window blocking position dividing the air flow space into front and rear vertical positive convection flow air channels, said raised shield being spaced closer to said outer glass sheet than to said inner glass sheet whereby said rear channel depth is comparatively large relative to said front channel depth, said front panel having ambient air inlet openings adjacent its lower edge and air outlet openings adjacent its upper edge providing a continuous air flow passage communicating between the lower well, the air flow space and the upper pocket; a laminar air flow panel positioned in the upper pocket in substantial alignment with said outer glass sheet, said shield when in its raised window blocking position extending upwardly with its upper portion in spaced rearward lapping relation with the lower portion of said laminar panel, said laminar panel dividing the upper pocket into front and rear laminar flow air ducts of substantially equal air flow capacity whereby the ambient air flowing in said front channel after air washing the front side of said shield and the back side of said outer glass sheet is distributed between said front and rear ducts while the ambient air flowing in said rear channel after air washing the back side of said shield and the front side of said inner glass sheet flows upwardly through said rear duct such that said front panel and the front side of said outer glass sheet are maintained at reduced temperatures during a heatcleaning operation in said oven.

Claim 4

In a door for enclosing a heat-cleaning oven, the combination comprising a front panel, a rear panel and an intermediate panel each having registering window openings in the upper half thereof, said front panel and said intermediate panel being spaced apart to define a lower well below the window level and an upper pocket above the window level, an outer glass sheet covering the window opening in said front panel, at least one inner glass sheet covering the window openings in said intermediate panel and said rear panel, a movable flat plate shield in said well of a dimension larger than the window openings having a reflective surface adapted to face said oven, means for raising and lowering said shield from said well into an air flow space between said outer glass sheet and said inner glass sheet, said shield in its raised window blocking position dividing the air flow space into front and rear vertical positive convection flow air channels, said raised shield being spaced closer to said outer glass sheet than to said inner glass sheet whereby said rear channel depth is comparatively large relative to said front channel depth, said front panel having ambient air inlet openings adjacent its lower edge and air outlet openings adjacent its upper edge providing a continuous air flow passage communicating between the lower well, the air flow space and the upper pocket; a laminar air flow panel positioned in the upper pocket in substantial alignment with said outer glass sheet, said shield when in its raised window blocking position extending upwardly with its upper portion in spaced rearward lapping relation with the lower portion of said laminar panel, said laminar panel dividing the upper pocket into front and rear laminar flow air ducts of substantially equal air flow capacity whereby the ambient air flowing in said front channel after air washing the front side of said shield and the back side of said outer glass sheet is distributed between said front and rear ducts while the ambient air flowing in said rear channel after air washing the back side of said shield and the front side of said inner glass sheet flows upwardly through said rear duct such that said front panel and the front side of said outer glass sheet are maintained at reduced temperatures during a heatcleaning operation in said oven.

Claim 5

In a door for enclosing a heat-cleaning oven, the combination comprising a front paNel, a rear panel and an intermediate panel each having registering window openings in the upper half thereof, said front panel and said intermediate panel being spaced apart to define a lower well below the window level and an upper pocket above the window level, an outer tempered glass sheet covering the window opening in said front panel, a pair of tempered glass sheets covering the window openings in said intermediate panel and said rear panel respectively providing a sealed hot air cavity between said pair of glass sheets, a movable flat plate reflective shield in said well of a dimension larger than the window openings, means for raising and lowering said shield from said well into an air flow space between said outer glass sheet and said pair of glass sheets, said shield in its raised window blocking position dividing the air flow space into front and rear vertical positive convection flow air channels, said raised shield being spaced sufficiently close to said outer glass sheet to provide an air flow path for said rear channel approximately three times greater in depth than said front channel, said front panel having ambient air inlet openings along its lower edge and outlet openings along its upper edge providing a continuous air flow path between the lower well, the air flow space and the upper pocket; a laminar flow panel positioned in the upper pocket in substantial alignment with said outer glass sheet, said shield when in its raised window blocking position extending upwardly with its upper portion in spaced rearward lapping relation with the lower portion of said laminar panel, said laminar panel dividing the upper pocket into front and rear laminar flow air ducts of substantially equal air flow capacity whereby the ambient air flowing in said front channel after air washing the front of said shield and the back of said outer glass sheet is distributed between said front and rear ducts while the ambient air flowing in said rear channel after air washing the back of said shield and the front of said intermediate panel glass sheet flows upwardly through said rear duct such that said front panel and the front of said outer glass sheet are maintained at reduced temperatures during a heat-cleaning operation in said oven.

Claim 6

In a door for enclosing a heat-cleaning oven, the combination comprising a front paNel, a rear panel and an intermediate panel each having registering window openings in the upper half thereof, said front panel and said intermediate panel being spaced apart to define a lower well below the window level and an upper pocket above the window level, an outer tempered glass sheet covering the window opening in said front panel, a pair of tempered glass sheets covering the window openings in said intermediate panel and said rear panel respectively providing a sealed hot air cavity between said pair of glass sheets, a movable flat plate reflective shield in said well of a dimension larger than the window openings, means for raising and lowering said shield from said well into an air flow space between said outer glass sheet and said pair of glass sheets, said shield in its raised window blocking position dividing the air flow space into front and rear vertical positive convection flow air channels, said raised shield being spaced sufficiently close to said outer glass sheet to provide an air flow path for said rear channel approximately three times greater in depth than said front channel, said front panel having ambient air inlet openings along its lower edge and outlet openings along its upper edge providing a continuous air flow path between the lower well, the air flow space and the upper pocket; a laminar flow panel positioned in the upper pocket in substantial alignment with said outer glass sheet, said shield when in its raised window blocking position extending upwardly with its upper portion in spaced rearward lapping relation with the lower portion of said laminar panel, said laminar panel dividing the upper pocket into front and rear laminar flow air ducts of substantially equal air flow capacity whereby the ambient air flowing in said front channel after air washing the front of said shield and the back of said outer glass sheet is distributed between said front and rear ducts while the ambient air flowing in said rear channel after air washing the back of said shield and the front of said intermediate panel glass sheet flows upwardly through said rear duct such that said front panel and the front of said outer glass sheet are maintained at reduced temperatures during a heat-cleaning operation in said oven.

Claim 7

A heat-cleaning oven door of hollow sheet metal construction having at least a pair of spaced apart first and second panels with registering rectangular window openings in the upper half of each said panel, inner and outer glass sheets covering the window openings in said panels, a rectangular heat reflective shield carried by the door and adapted to be moved from a lowered hidden position between said panels to a raised visible position between said glass sheets, link means pivoted to said shield, an operating link positioned above said window openings for reciprocal movement in a horizontal plane between said first and second panels, one end of said operating link pivotally connected to said link means, the free opposite end of said operating link providing a strike portion, a rotatable lock handle operative to rotate a slider plate on the oven body for locking the door in its closed heat-cleaning position against the oven body, said slider plate having a latch hook portion which will pass through a registering slot in the door in an unlocked angular position, said latch hook adapted to engage said operating link strike portion such that upon rotating said handle in a first direction said slider plate is rotated into position to engage said strike portion causing horizontal movement of said operating link in said first direction together with movement of said link means resulting in elevation of said shield to its raised visible position between said glass sheets, said latch hook adapted to disengage said operating link strike portion upon rotating said lock handle in a second direction causing free horizontal movement of said operating link in said second direction together with movement of said link means due to gravitational force on saiD shield whereby said shield is lowered to its hidden position between said panels.

Claim 8

A heat-cleaning oven door of hollow sheet metal construction having at least a pair of spaced apart first and second panels with registering rectangular window openings in the upper half of each said panel, inner and outer glass sheets covering the window openings in said panels, a rectangular heat reflective shield carried by the door and adapted to be moved from a lowered hidden position between said panels to a raised visible position between said glass sheets, link means pivoted to said shield, an operating link positioned above said window openings for reciprocal movement in a horizontal plane between said first and second panels, one end of said operating link pivotally connected to said link means, the free opposite end of said operating link providing a strike portion, a rotatable lock handle operative to rotate a slider plate on the oven body for locking the door in its closed heat-cleaning position against the oven body, said slider plate having a latch hook portion which will pass through a registering slot in the door in an unlocked angular position, said latch hook adapted to engage said operating link strike portion such that upon rotating said handle in a first direction said slider plate is rotated into position to engage said strike portion causing horizontal movement of said operating link in said first direction together with movement of said link means resulting in elevation of said shield to its raised visible position between said glass sheets, said latch hook adapted to disengage said operating link strike portion upon rotating said lock handle in a second direction causing free horizontal movement of said operating link in said second direction together with movement of said link means due to gravitational force on saiD shield whereby said shield is lowered to its hidden position between said panels.