Melvin E Speicher

US Patent:

40073254, Feb 8, 1977

Filed:

Aug 13, 1975

Appl. No.:

5/604169

Inventors:

Arnold G. Bowles - Warren PA
Andrew S. D. Crum - Warren PA
Melvin E. Speicher - Tidioute PA

Assignee:

National Forge Company - Irvine PA

International Classification:

H05B 366

US Classification:

13 22

Abstract:

An electrically heated furnace assembly, suitable for a hot isostatic press, having windings of one or more resistance heating elements, helically wound about the longitudinal axis of the furnace assembly; rigid insulating sleeves, enclosing the heating elements and substantially covering their surfaces; the insulating sleeves abutting against the leading and trailing edges of one another and against the outer, upper and lower surfaces of one another; and a spiral shelf provided about the longitudinal axis of the furnace assembly, underlying the heating elements, and abutting against the outer lower surfaces of the insulating sleeves which enclose the lowermost winding of the resistance heating elements.