National Forge Company

Andrew Stephenson Crum

Donald E Witkin

Arnold G Bowles

Melvin E Speicher

Apparatus for the cooling of articles which have been subjected to an isostatic pressing process is provided. The apparatus includes an injector system which is connected with a fresh gas supply conduit, and with passages along which the gases are drawn from the interior of the apparatus by the injector system, all in such a manner that a circulation of gas can be maintained in the pressure chamber, primarily between the top and bottom regions of the apparatus.

Apparatus for the cooling of articles which have been subjected to an

In a multizone electrical furnace the phase shift effect of the thyristor devices used to control the power supplied to each thermal zone is reduced by providing two or more heater circuits, each including a thyristor device and a heating element, for each thermal zone. The thyristor devices are controlled so that only one thyristor device associated with each thermal zone is operating to produce a substantial phase shift at any time. Over-powering the heating elements at higher furnace temperatures may also be prevented by connected two or more heating elements associated with a thermal zone to one of the thyristor devices associated with that zone above a predetermined threshold temperature.

Multizone electrical furnace methods and apparatus

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.

Furnace assembly

A hot isostatic press which includes a mantle interposed between heating elements and the wall of the press and means associated with the press for equalizing the pressure on both sides of said mantle during operation of the press or during pressurization or depressurization.

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Warren, PA, United States of America

Andrew Stephenson Crum