Annular furnaces with a rotary hearth for shaping one of the fac

Details Annular furnaces with a rotary hearth for shaping one of the fac Annular furnaces with a rotary hearth for shaping one of the fac

1989-10-20

1991-05-28

Reynolds, Bruce A.

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

432138, 432124, F27D 1106

Patent

active

050196898

ABSTRACT:
The invention relates to a continuous furnace for shaping one of the faces of blanks of optical lenses to a desired profile by heat sagging of the blanks on suitably profiled jigs with the concomitant action of a vacuum. The continuous furnace includes a stationary frame, an annular rotary hearth formed from a plurality of successive sections with each section being provided with a plurality of tulip-shaped supports intended to support the jigs, a stationary tunnel having at least one zone for heating the blanks at a temperature which causes them to soften and at least one zone for cooling the blanks which have one of their faces shaped, a motor for driving the hearth in rotation, a vacuum source driven in rotation with the hearth, and a suitable device for connecting the tulip-shaped supports of a given section of the hearth to the vacuum source when this section reaches a first predetermined position in the heating zone and for connecting the tulip-shaped supports to ambient air when the section reaches a second predetermined position in the heating zone. The furnace of the invention is useful in the manufacture of graded-index lenses.

REFERENCES:
patent: 2074662 (1937-03-01), McLay
patent: 2924695 (1960-02-01), Atkeson
patent: 3248517 (1966-04-01), Vranken
patent: 4412813 (1983-11-01), Wulf

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