US3694882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for providing a corrugated seal in an elastic fluid machine
Assignee: PITTSBURGH ELECTRIC CORP
•
Filing: 1970-09-24
•
Granted: 1972-10-03
•
Expires: 1990-09-24
Abstract
Abstract A turbine rotor blade path seal consists of a corrugated strip of sheet metal secured edgewise in an annular groove in the turbine cylinder or casing. The corrugated seal strip requires no edge rolling for the various diameters of the different stages of a multi-stage turbine. Thus, one pattern of a seal strip which is easily customized and assembled can be utilized for all stages of a turbine. The seal strip is caulked or interlocked in the groove at assembly by means of a special tool.
Inventors
- 👤 John William Desmond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:59
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/44; F16J15/444; F01; F01D; F01D11/00; F01D11/08; F01D11/12; F01D11/127; F05; F05D; F05D2250/00; F05D2250/60; F05D2250/61; Y; Y10; Y10S; Y10S29/00; Y10S29/034; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/4932; Y10T29/49321; Y10T29/49826; Y10T29/49833; Y10T29/49908; Y10T29/49915; Y10T29/49922; Y10T29/49936
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
99 words
A method for providing an annular strip between rotating and stationary portions of an elastic fluid machine comprising the steps of: forming an annular groove having generally radially extending sidewalls in one of said portions of said machine, inserting a corrugated strip of sheet material edgewise into said groove with said strip extending beyond said groove, deforming the strip to an annular shape, shearing and deforming a portion of said strip, and driving said sheared and deformed portion of said strip into at least one of said sidewalls of said groove thereby securely fastening said strip in said groove.
Claim 2
Independent Claim
99 words
A method for providing an annular strip between rotating and stationary portions of an elastic fluid machine comprising the steps of: forming an annular groove having generally radially extending sidewalls in one of said portions of said machine, inserting a corrugated strip of sheet material edgewise into said groove with said strip extending beyond said groove, deforming the strip to an annular shape, shearing and deforming a portion of said strip, and driving said sheared and deformed portion of said strip into at least one of said sidewalls of said groove thereby securely fastening said strip in said groove.
Claim 3
Dependent Claim
37 words
The method as set forth in claim 1, wherein the steps of shearing and deforming the strip and driving the sheared portion into at least one sidewall of the groove are performed simultaneously utilizing an assembling tool.
Claim 4
Dependent Claim
37 words
The method as set forth in claim 1 and further comprising the steps of pressing the corrugated strip against the bottom of the groove, said pressing step being performed prior to the step of shearing and deforming.
Claim 5
Dependent Claim
44 words
The method as set forth in claim 1 and further comprising the step of forming the corrugated strip with flat surfaces which engage the sides of the groove and shearing and deforming the strip in a plurality of locations disposed within the flat surfaces.
Claim 6
Dependent Claim
55 words
The method as set forth in claim 4 and further comprising the step of forming the corrugated strip so as to have ligaments between the flat surfaces and disposing said ligaments at an oblique angle with respect to the flat surfaces so as to accommodate the step of inserting the corrugated strip into the groove.
Claim 7
Independent Claim
101 words
A method for providing an annular seal between rotating and stationary portions of an elastic fluid machine comprising the steps of: forming an annular seal having generally radially extending sidwalls in one of said portions of said machine, inserting a rectilinear corrugated strip of sheet material edgewise in said groove with said strip extending beyond said groove, progressively deforming the strip to an annular shape, shearing and deforming a portion of said strip, and driving the shearing and deformed portion of said strip into at least one of said sidewalls of said groove, thereby securely fastening said strip in said groove.
Claim 8
Independent Claim
101 words
A method for providing an annular seal between rotating and stationary portions of an elastic fluid machine comprising the steps of: forming an annular seal having generally radially extending sidwalls in one of said portions of said machine, inserting a rectilinear corrugated strip of sheet material edgewise in said groove with said strip extending beyond said groove, progressively deforming the strip to an annular shape, shearing and deforming a portion of said strip, and driving the shearing and deformed portion of said strip into at least one of said sidewalls of said groove, thereby securely fastening said strip in said groove.
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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |