Electric resistance heating devices – Heating devices – Radiant heater
Patent
1993-10-04
1994-08-09
Reynolds, Bruce A.
Electric resistance heating devices
Heating devices
Radiant heater
219388, 65162, 65118, 432 8, 432 31, C03B 2904, F26B 1900
Patent
active
053373936
ABSTRACT:
A roller conveyor furnace (12) for heating flat glass sheets has top and bottom heating arrays (28,30) respectively located above and below the plane of conveyance with each heating array including a plurality of elongated heaters (32,34) extending parallel to the direction of conveyance and spaced laterally from each other with respect to the direction of conveyance. The top heating array (28) has one more heater (32) than the number of heaters (34) of the bottom heating array (30) and the bottom heaters (34) are located in a laterally staggered relationship with respect to the top heaters such that each bottom heater is located laterally between a pair of top heaters. A control (36) energizes the top and bottom heating arrays (28,30) to heat each bottom heater (34) only when the two top heaters 32 on opposite lateral sides thereof are heated to thereby prevent excessive lateral edge heating of the conveyed glass sheet. Each heater (32,34) is also preferably of the electrical resistance type including an electric resistance element (32e, 34e) that is energized by the control to provide the heating.
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Glasstech, Inc.
Jeffery John A.
Reynolds Bruce A.
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