Interchangeable see-through and opaque inserts for muffle furnac

Details Interchangeable see-through and opaque inserts for muffle furnac Interchangeable see-through and opaque inserts for muffle furnac

1975-05-30

1976-09-14

Sprague, Kenneth W.

Furnaces

Doors

Explosion relief doors

126200, 432250, F23M 700

Patent

active

039800288

ABSTRACT:
Prior to the present invention, there has not existed any equivalent to the present furnace door for a porcelain furnace in which door there is provided a lineal passage for alternate insertion of an opaque insulator insert and a viewing structure defining a lineal see-through channel having a transparent heat barrier at an outer end thereof utilizing air space within the channel extending to an interior-furnace end for insulating air, and an outer end of the passage defining female step(s) and the respective inserts each respectively including a male step(s) which mates flushly with the female step when inserted to provide an improved heat seal for the inserts each respectively.

REFERENCES:
patent: 1802000 (1931-04-01), Brooke
patent: 2002241 (1935-05-01), Forde
patent: 2733707 (1956-02-01), Skibiski
patent: 2920585 (1960-01-01), Grossman et al.
patent: 3800716 (1974-04-01), Berger

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