Pipe joints or couplings – Flexible joint – rigid members – Bellows
Patent
1977-05-26
1979-02-20
Stein, Mervin
Pipe joints or couplings
Flexible joint, rigid members
Bellows
138149, 285 53, 285236, F16L 2100, F16L 2710, F16L 5102, F16L 5916
Patent
active
041403380
ABSTRACT:
An expansion joint for duct work is disclosed, which comprises a pair of frames, spacer means extending outwardly from said frames, and a boot. The boot has five layers: an inner asbestos/aluminum/silica material, a fibrous insulation batt, a middle asbestos/aluminum material, a vapor barrier, and an outer asbestos/fluoroelastomer material.
REFERENCES:
patent: 397822 (1889-02-01), Suhr
patent: 3315704 (1967-04-01), Shire
patent: 3460856 (1969-08-01), Van Tine et al.
patent: 3730566 (1973-05-01), Kazmierski, Jr. et al.
patent: 3874711 (1975-04-01), Scalzo et al.
patent: 3934905 (1976-01-01), Lockard
patent: 3948295 (1976-04-01), Lemont et al.
patent: 4063755 (1977-12-01), Merz
Ambrose John L.
Dmuchowski Frederick S.
Kazmierski, Jr. John
Thornton Craig E.
Johns-Manville Corporation
Kelly Joseph J.
Krone Robert M.
McClain James W.
Pietruszka Carl F.
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