Prefabricated double-walled metal chimney

Details Prefabricated double-walled metal chimney Prefabricated double-walled metal chimney

1981-03-16

1984-07-31

Callaghan, Thomas J.

Pipe joints or couplings

With casing, lining or protector

Insulated

138149, 285 64, 285319, 285424, F16L 5914

Patent

active

044626185

ABSTRACT:
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.

REFERENCES:
patent: 2650112 (1953-08-01), Kinkead
patent: 2894537 (1959-07-01), Carr
patent: 2937662 (1960-05-01), Green
patent: 3170544 (1965-02-01), Kinkead et al.
patent: 3575445 (1971-04-01), French
patent: 3850453 (1974-11-01), Bentley et al.
patent: 3889715 (1975-06-01), Lilja et al.
patent: 4029344 (1977-06-01), Stone
patent: 4139005 (1979-02-01), Dickey

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