US3601414A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic crossarm seal for gas turbine regenerators
Assignee: Ford Motor Co
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Filing: 1969-10-29
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Granted: 1971-08-24
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Expires: 1989-10-29
Abstract
Abstract A thin walled steel case has a ceramic shoe projecting through an opening in one side thereof. Externally facing shoulders along the longitudinal edges of the shoe bear against the edges of the case. A fibrous resilient ceramic material fills the remainder of the case and is located between the bottom of the shoe and the base of the case to adsorb deflecting forces.
Inventors
- 👤 Vemulapalli D Rao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:58
CPC Classifications
F; F28; F28D; F28D19/00; F28D19/04; F28D19/047
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
174 words
In a gas turbine engine having a housing and a rotating regenerator mounted in said housing, a seal for said rotating regenerator having good oxidation resistance, good dimensional stability throughout a wide temperature range, and a low coefficient of friction and low wear when rubbing against a ceramic material, said seal comprising a thin walled case member having a base and longitudinal edges folded partially back over said base to define a longitudinal opening in one side of said case member, a structurally integral ceramic shoe positioned in said opening, said ceramic shoe having externally facing shoulders along its longitudinal edges, said shoulders bearing against the edges of said case forming said opening, and resilient material located in said case member between the base of the case member and the inner surface of said ceramic shoe, said resilient material urging said ceramic shoe out of said case member so the outer surface of said ceramic shoe bears against a moving ceramic material to seal the surface between the ceramic material and the ceramic shoe.
Claim 2
Dependent Claim
174 words
In a gas turbine engine having a housing and a rotating regenerator mounted in said housing, a seal for said rotating regenerator having good oxidation resistance, good dimensional stability throughout a wide temperature range, and a low coefficient of friction and low wear when rubbing against a ceramic material, said seal comprising a thin walled case member having a base and longitudinal edges folded partially back over said base to define a longitudinal opening in one side of said case member, a structurally integral ceramic shoe positioned in said opening, said ceramic shoe having externally facing shoulders along its longitudinal edges, said shoulders bearing against the edges of said case forming said opening, and resilient material located in said case member between the base of the case member and the inner surface of said ceramic shoe, said resilient material urging said ceramic shoe out of said case member so the outer surface of said ceramic shoe bears against a moving ceramic material to seal the surface between the ceramic material and the ceramic shoe.
Claim 3
Dependent Claim
18 words
The engine of claim 1 in which the resilient material comprises a cushion made from fibrous ceramic material.
Claim 4
Dependent Claim
56 words
The engine of claim 2 in which the case member has a substantially triangular cross section with one of the angles thereof being truncated to form said opening, and the shoe member has a trapezoidal lower portion mounted within said case, said trapezoidal lower portion being integral with a rectangular upper portion projecting through said opening.
Claim 5
Dependent Claim
26 words
The engine of claim 3 comprising spring means located outside of said case member for maintaining contact between said ceramic shoe and said moving ceramic material.
Claim 6
Dependent Claim
77 words
In a gas turbine engine having a housing and a rotating regenerator mounted in said housing, a seal for said rotating regenerator comprising a case member having a base and longitudinal edges folded over said base to define a longitudinal opening in one side of said case member, said case member being mounted in a groove in said housing, and a ceramic shoe positioned in said opening of said case, said shoe bearing against said rotating regenerator.
Claim 7
Dependent Claim
77 words
In a gas turbine engine having a housing and a rotating regenerator mounted in said housing, a seal for said rotating regenerator comprising a case member having a base and longitudinal edges folded over said base to define a longitudinal opening in one side of said case member, said case member being mounted in a groove in said housing, and a ceramic shoe positioned in said opening of said case, said shoe bearing against said rotating regenerator.
Claim 8
Dependent Claim
92 words
The engine of claim 5 comprising spring means located between said case and the bottom of said groove for urging said case member out of said groove, said spring means maintaining said shoe in contact with said regenerator and sealing the area between said case and said groove. 7 The engine of claim 6 in which the spring means is a foil member having its longitudinal edges retained in said case member and its central portion bowed away from the case member, said central portion bearing against the bottom of said groove.
Claim 9
Dependent Claim
78 words
The engine of claim 6 in which the case member has a substantially triangular cross section, said case being truncated across one of its corners to form said opening, said case member mounted in said groove with the side opposite the truncated angle facing the bottom of the groove, and the shoe has a trapezoidal lower portion mounted within the longitudinal edges of the case, said trapezoidal portion being intEgral with a rectangular portion extending through said opening.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |