Patent US3620557A successfully refreshed from Google Patents.
US3620557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for conducting gas
Assignee: Entwicklungsring Sued GmbH
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Filing: 1969-07-01
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Granted: 1971-11-16
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Expires: 1989-07-01
Abstract
Abstract An apparatus for compensating for the thermal expansion of a gas duct. Two ducts are coaxially positioned for sliding engagement. The inner duct is provided with a pair of parallel, outwardly projecting flanges. The end of the outer duct is provided with an outwardly disposed flange, the ends of which are formed to define a cylindrical segment coaxial with the inner duct. The free end of the cylindrical segment is inwardly formed to define an inwardly disposed flange which is positioned between the pair of flanges projecting from the surface of the inner duct. Cylindrically shaped accordion bellows are secured to the adjacent surfaces of the flanges so as to define three pressure chambers.
Inventors
- 👤 Rolf Gustav Sturm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:52
CPC Classifications
B; B64; B64G; B64G1/00; B64G1/22; B64G1/40; F; F16; F16L; F16L51/00; F16L51/02; F16L51/03; F16L51/035
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
223 words
An apparatus for compensating for relative longitudinal movement of sections of a high-pressure air duct comprising slidably engaged telescoping inner and outer duct sections, a first flange radially outwardly projecting from the end of said outer duct section, a second flange radially outwardly projecting from the outer surface of said inner duct section, a first cylindrically shaped accordion bellows secured to and spanning the distance between the adjacent surfaces of said first and second flanges, a cylindrical segment secured to the outer edge of said first flange, and extending over and beyond said second flange, a third flange secured to the free end of said cylindrical segment and disposed radially inwardly, a second cylindrically shaped accordion bellows secured to and spanning the distance between the adjacent surfaces of said second and third flanges, a fourth flange secured to and radially outwardly extending from the surface of said inner duct section and a third cylindrically shaped accordion bellows secured to and spanning the distance between said third and fourth flanges, said inner duct section, said second and third bellows and said second, third and fourth flanges defining a counterpressure chamber, with substantial portions of said second and third flanges defining reaction surfaces in said chamber, one of said duct sections having an opening therein communicating said counterpressure chamber and the interior of said ducts.
Claim 2
Independent Claim
223 words
An apparatus for compensating for relative longitudinal movement of sections of a high-pressure air duct comprising slidably engaged telescoping inner and outer duct sections, a first flange radially outwardly projecting from the end of said outer duct section, a second flange radially outwardly projecting from the outer surface of said inner duct section, a first cylindrically shaped accordion bellows secured to and spanning the distance between the adjacent surfaces of said first and second flanges, a cylindrical segment secured to the outer edge of said first flange, and extending over and beyond said second flange, a third flange secured to the free end of said cylindrical segment and disposed radially inwardly, a second cylindrically shaped accordion bellows secured to and spanning the distance between the adjacent surfaces of said second and third flanges, a fourth flange secured to and radially outwardly extending from the surface of said inner duct section and a third cylindrically shaped accordion bellows secured to and spanning the distance between said third and fourth flanges, said inner duct section, said second and third bellows and said second, third and fourth flanges defining a counterpressure chamber, with substantial portions of said second and third flanges defining reaction surfaces in said chamber, one of said duct sections having an opening therein communicating said counterpressure chamber and the interior of said ducts.
Claim 3
Dependent Claim
23 words
An apparatus in accordance with claim 1 wherein said first, second and third bellows are constructed of a heat-resistant, high-strength elastic synthetic material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |