Wallace-Murray Corporation

Richard L Stone

A metal chimney comprised of prefabricated double-walled sections packed with compressible mineral fiber insulation material between the inner and outer metal walls. Each section has a male end and a female end constructed so that a plurality of sections can be interconnected together end-to-end and will maintain structural integrity while also reducing heat conductivity and gas leakage from the inner wall to the outer wall. The female end of each section has a flexible, diaphragm like insulation retainer and seal, while the male end utilizes a rigid spider comprised of spaced apart spoke portions between inner and outer walls in combination with an annular wafer of thin nonmetallic sheet material. After installation, the flexible diaphragm seal is compressed against the rigid spider and annular wafer allowing the insulation to form a gas seal, which is maintained even if these wafers or diaphragm seals are consumed by chimney heat.

Prefabricated double-walled metal chimney

A prefabricated metal chimney formed of double wall sections which can be connected so that the inner pipe joints are substantially air or smoke tight. The inner pipes of adjacent sections have end flanges which engage and are held together by an inner band member. Attached near each opposite end of the outer wall member for each section is a spacer band with circumferentially spaced apart tab means. Inter tab means extend radially outwardly from the band and is fixed to the outer pipe wall while inner tab means is held to the inner pipe by the inner band member.

Connection joint for prefabricated metal chimney

An expansion and length adjustment joint for a prefabricated double-walled metal chimney is disclosed. The joint provides for easy installation of the chimney at a job site without cutting of chimney sections. To prevent escape of flue gases, at least one gasket is positioned on one inner wall member for sliding engagement against the other inner wall member.

Growing community of inventors

Los Altos Hills, CA, United States of America

Richard L Stone