Patent US4197052A successfully refreshed from Google Patents.
US4197052A
Expired / Lapsed
US
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Safety device for an axially rotating machine
Assignee: Safran Aircraft Engines SAS
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Filing: 1978-10-02
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Granted: 1980-04-08
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Expires: 1998-10-02
Abstract
Abstract A device to eject a fragment of a broken blade of an axially rotating mace by damping its kinetic energy, in order to prevent perforating the housing of the machine and the rupture of adjacent blades. The device is in the form of a helical ramp carried by the internal wall of the housing of the machine.
Inventors
- 👤 Alain M. J. Lardellier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:34
CPC Classifications
F; F01; F01D; F01D21/00; F01D21/04; F01D21/045; F01D11/00; F01D11/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
108 words
A device to prevent damage by the failure of a blade of the rotating blading of a stage of an axially rotating machine, particularly a blade with a head flange of the blower of a turbojet engine, said device consisting of a helical ramp arranged on the internal wall of the part of the housing surrounding the blading, the pitch of the helix being such that when the fragment of a blade ejected tangentially by the rupture of a blade comes into contact with said internal wall, its rotation against said wall will cause it to engage the ramp and be deflected from the plane of the blading.
Claim 2
Independent Claim
108 words
A device to prevent damage by the failure of a blade of the rotating blading of a stage of an axially rotating machine, particularly a blade with a head flange of the blower of a turbojet engine, said device consisting of a helical ramp arranged on the internal wall of the part of the housing surrounding the blading, the pitch of the helix being such that when the fragment of a blade ejected tangentially by the rupture of a blade comes into contact with said internal wall, its rotation against said wall will cause it to engage the ramp and be deflected from the plane of the blading.
Claim 3
Dependent Claim
27 words
A device according to claim 1, wherein said helical ramp consists of a rib, the width of which is appreciably less than the pitch of the helix.
Claim 4
Dependent Claim
24 words
A device according to claim 1 or claim 2, wherein the angle of the slope of the helix is between 1 and 4 degrees.
Claim 5
Dependent Claim
18 words
A device according to claim 3, wherein the angle of slope of the helix is approximately 2 degrees.
Claim 6
Dependent Claim
22 words
A device according to claim 3, wherein the pitch of the helix is approximately equal to the width of the blading zone.
Claim 7
Dependent Claim
67 words
A device according to claim 1, wherein the blades of the blading are of the head flange type with the juxtaposition of said flanges forming a continuous ring, each flange being equipped with at least one circumferential projection upstream and one circumferential projection downstream, each succession of projections playing the role of tongues, the pitch of the helix being approximately equal to the distance between said projections.
Claim 8
Dependent Claim
48 words
A device according to claim 6, wherein each flange is equipped with N number of equidistant projections, the ramp being in the form of multiple helixes with N threads, the pitch of each helix being approximately equal to the distance between the upstream projections and the downstream projections.
Claim 9
Dependent Claim
18 words
A housing for an axially rotating machine, wherein said housing includes a device as defined in claim 1.
Claim 10
Dependent Claim
22 words
A housing for a blower of a turbojet engine, wherein said housing includes a device according to claim 6 or claim 7.
References Cited (Backward Citations)
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US3261228A
Cited
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Cited
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Cited
GB1466385A
Cited
US4044550A
Cited
US4149824A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-08 | 1983-10-08 | 1984-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-08 | 1987-10-08 | 1988-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-08 | 1991-10-08 | 1992-04-08 | $7700.00 | Window Closed / Lapsed |