Title: Furnace for heat treating glass sheet material

Abstract: A furnace for heat treating glass sheet material including a circular enclosure having top, bottom and side walls of refractory material. Inlet and outlet openings are formed in the side walls. The side walls have an outer insulating layer and an inner layer of material having a low coefficient of thermal expansion, the inner layer having spaced end portions projecting beyond the outer layers and the periphery of the side walls to define said inlet and outlet openings. Each opening is controlled by doors, and each door includes an elongated support bar with a plurality of blocks of refractory material supported on the bar in end-to-end relationship. The blocks are adjustably secured to the bar to accommodate irregularities in the openings.

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Inventors: McMaster, Harold A. (Woodville, OH, US)
Nitschke, Norman C. (Perrysburg, OH, US)

Application Number: 542339
Filing Date: 1975-01-20
Publication_date: 1976-01-06
Assignee:
Primary Class(es): 65/348 432/145, 432/176, 432/185, 432/250
Other Classes:
US Patent Ref:

1311286	Jul, 1919	Munhollow	432/176.
2664838	Jan, 1954	Sorensen	432/250.
2841925	Jul, 1958	McMaster	65/350.

Other Refs:
Primary Examiner: Kellogg, Arthur D.
Assistant Examiner:
Attorney: Reising, Ethington, Barnard, Perry & Brooks