Leco Corporation

Keith J Adani

Gordon C Ford

Larry S O'Brien

Carlos Guerra

Robert G Warren

A vertical resistive combustion furnace having a vertically oriented combustion zone in which first and second coaxially aligned tubes depend. The first tube is open at one end and closed at the other. The second tube is open at one end and partially closed at the other end and is mounted within and spaced from the first tube with the space between the coaxial tubes defining a passage for combustion products produced from a sample of material to be analyzed, disposed in said second tube. The combustion products pass upwardly in the channel through the combustion zone of the furnace so that the combustion products are hot when they exit the furnace for analysis.

Vertical combustion furnace

A combustion chamber includes an inner cylindrical member concentrically mounted within an outer cylindrical member with a cylindrical space therebetween. The outer cylindrical member is enclosed at one end and both cylindrical members are open at an opposite end for access to the combustion area. The by-products of combustion are withdrawn from the inner cylindrical member at the closed end of the outer cylindrical member such that they reverse direction and circulate through the hot zone of the furnace in the cylindrical space. In a preferred embodiment of the invention, a porous ceramic plug which supports and spaces the tubes in concentric relationship at the one end and captures particulate by-products of the combustion holding them in the hot zone for complete combustion.

Combustion system

A sample mounting system includes a coupon holder having a plurality of apertures defining in part mold cavities for supporting a plurality of printed circuit board coupons on the holder. A removable mold is also provided and engages the coupon holder to define mold cavities into which molding resin is poured. The mold is then removed from the coupon holder which is secured in an annular stop ring and mounted to a polishing machine for polishing coupons molded in place with respect to the holder.

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Bridgman, MI, United States of America

Keith J Adani