Flow-through shutter for oven door window

Claim 2

An oven door comprising an outer panel and an inner door liner spaced inwardly therefrom, substantially aligned window openings in said panel and door liner and glass panes closing said window openings, the door including a cooling air channel between said glass panes with air inlet means along the bottom portion of the door and air outlet means along the top portion of the door, a manually operable hollow shutter, means mounting said shutter for movement within the said air channel between an open position hidden within the door to permit viewing through said window openings and a closed position covering the glass panes for both restricting the radiation of heat through said window openings and forcing the cooling air to pass through the shutter rather than sweeping across the faces of the glass panes so as to prevent the deposition of airborne soil thereon.

Claim 3

An oven door as recited in claim 1 with sealing means carried by the lower portion of the hollow shutter so that when the shutter is in its open position the said sealing means acts to close the air inlet means to substantially prevent air movement through the said air channel.

Claim 4

An oven door of hollow sheet metal construction provided with a transparent window formed by a plurality of glass sheets mounted therein, a cooling air channel formed in the door and extending between two of the adjacent glass sheets, there being air inlet means adjacent the bottom portion of the door and air outlet means adjacent the top portion of the door, a manually operable hollow shutter, means mounting said shutter within the air channel for movement between an open hidden position within the door and a closed visible position blocking the window to restrict the radiation of heat energy through the window, and sealing means operable to close the air inlet means when the shutter is in its open position, the hollow shutter tending to protect the adjacent glass sheets from air movement when the shutter is in its closed position by causing the cooling air to by-pass the glass sheets and pass upwardly through the hollow shutter so as to prevent the deposition of airborne soil on the glass sheets which might otherwise restrict visibility through the window.

Claim 5

An oven door of hollow sheet metal construction provided with a transparent window formed by a plurality of glass sheets mounted therein, a cooling air channel formed in the door and extending between two of the adjacent glass sheets, there being air inlet means adjacent the bottom portion of the door and air outlet means adjacent the top portion of the door, a manually operable hollow shutter, means mounting said shutter within the air channel for movement between an open hidden position within the door and a closed visible position blocking the window to restrict the radiation of heat energy through the window, and sealing means operable to close the air inlet means when the shutter is in its open position, the hollow shutter tending to protect the adjacent glass sheets from air movement when the shutter is in its closed position by causing the cooling air to by-pass the glass sheets and pass upwardly through the hollow shutter so as to prevent the deposition of airborne soil on the glass sheets which might otherwise restrict visibility through the window.

Claim 6

An oven door as recited in claim 3 wherein the said hollow shutter comprises a pair of spaced metal plates so that the shutter is substantially open at the bottom and top thereof, the said sealing means being carried by the bottom portion of the shutter and comprising resilient means for engaging and closing the air inlet means.

Claim 7

A door construction for a high temperature oven having an oven cavity formed by a box-like oven liner and a front-opening access door; the invention comprising a door having an outer door panel with a first window opening, a first glass pane covering said first window opening, an inner door liner attached to and spaced inwardly from said outer door panel, a second window opening formed in said inner door liner, at least two spaced glass panes covering said second window opening, a cooling air channel located within the door behind the first glass pane, a movable shutter, means supporting said shutter within the air channel in either a hidden position within the door for normal cooking operations or in an exposed position behind the first glass pane during a high temperature operation so as to restrict the radiation of heat energy through the window, the air channel having air inlet openings adjacent the bottom portion of the door and air outlet openings adjacent the top portion of the door, the shutter being formed of spaced panels to form a hollow construction that is open at least at the top and bottom to allow cooling air to flow therethrough, the spaced panels of the shutter covering the adjacent glass panes when the shutter is in its exposed position whereby the air flow passes through the shutter during the high temperature operation rather than sweeping across the glass panes.

Claim 8

A door construction for a high temperature oven having an oven cavity formed by a box-like oven liner and a front-opening access door; the invention comprising a door having an outer door panel with a first window opening, a first glass pane covering said first window opening, an inner door liner attached to and spaced inwardly from said outer door panel, a second window opening formed in said inner door liner, at least two spaced glass panes covering said second window opening, a cooling air channel located within the door behind the first glass pane, a movable shutter, means supporting said shutter within the air channel in either a hidden position within the door for normal cooking operations or in an exposed position behind the first glass pane during a high temperature operation so as to restrict the radiation of heat energy through the window, the air channel having air inlet openings adjacent the bottom portion of the door and air outlet openings adjacent the top portion of the door, the shutter being formed of spaced panels to form a hollow construction that is open at least at the top and bottom to allow cooling air to flow therethrough, the spaced panels of the shutter covering the adjacent glass panes when the shutter is in its exposed position whereby the air flow passes through the shutter during the high temperature operation rather than sweeping across the glass panes.

Claim 9

A door construction as recited in claim 5 including vertical guide rails within the air channel on each side of the window opening, the sides of the shutter being provided with slide means engageable with the guide rails, and handle means for raising and lowering the shutter on the guide rails, and means for supporting the shutter in its raised position.

Claim 10

A door construction as recited in claim 6 with sealing means carried by the lower portion of the shutter so that when the shutter is in its lowered position the said sealing means acts to close the air inlet openings to substantially prevent air movement through the air channel, the door being provided with hinge means adjacent the two bottom corners thereof whereby air is allowed to enter the air channel in these hinge areas, the said guide rails including partition means to close off the opposite sides of the air channel into side compartments so that the air entering the door around the hinge areas does not reach the shutter and the area between the shutter and the adjacent panes of glass.

Claim 11

An oven door comprising an outer panel and an inner door liner spaced inwardly therefrom, substantially aligned window openings in said outer panel and inner liner, and spaced glass panes closing said window openings, a cooling air channel within the door that extends between two adjacent glass panes and has air inlet openings in the lower portion of the door and air outlet openings in the upper portion of the door, and a shutter mounted in the air channel and means for moving said shutter into either a lower hidden position or an upper exposed position between the two said adjacent glass panes, the shutter being formed of spaced panels to be hollow so that when the shutter is raised the spaced panels cover the adjacent glass panes and any upward air movement passes up through the shutter rather than sweeping across the faces of the glass panes to protect the panes from being soiled by airborne particles.

Claim 12

An oven door comprising an outer panel and an inner door liner spaced inwardly therefrom, substantially aligned window openings in said outer panel and inner liner, and spaced glass panes closing said window openings, a cooling air channel within the door that extends between two adjacent glass panes and has air inlet openings in the lower portion of the door and air outlet openings in the upper portion of the door, and a shutter mounted in the air channel and means for moving said shutter into either a lower hidden position or an upper exposed position between the two said adjacent glass panes, the shutter being formed of spaced panels to be hollow so that when the shutter is raised the spaced panels cover the adjacent glass panes and any upward air movement passes up through the shutter rather than sweeping across the faces of the glass panes to protect the panes from being soiled by airborne particles.

Claim 13

An oven door as recited in claim 8 wherein the said air channel includes a substantially vertical guide rail at each side of the shutter, and the shutter is furnished with slide means which cooperate with the guide rails for supporting the shutter, said guide rails cooperating with partitions that subdivide the air channel into at least three separate air channels, there being a first relatively large central window section and a pair of spaced narrow side channels.

Claim 14

An oven door as recited in claim 9 with resilient sealing means carried by the lower portion of the shutter so that when the shutter is in its lower position the sealing means acts to close the air inlet openings and prevent air movement up through the central window section of the air channel.