US3773336A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seals for rotatable members
Assignee: Blohm and Voss GmbH
•
Filing: 1971-02-17
•
Granted: 1973-11-20
•
Expires: 1991-02-17
Abstract
Abstract A seal for the shaft of a ship comprises a holder for two axially spaced sealing rings one of which first engages the rotatable part and the other is a spare ring which if the ring first engaging the rotatable part becomes defective can, by relative axial movement between the holder and the rotatable part, be moved into sealing relation with the rotatable member.
Inventors
- 👤 G Walter
- 👤 G Pietsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:24
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/002; F16J15/008; B; B63; B63H; B63H23/00; B63H23/32; B63H23/36; B63H23/321; B63H2023/327; Y; Y10; Y10S; Y10S277/00; Y10S277/914
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
147 words
A seal for a rotatable shaft, comprising: a plurality of radial lip sealing rings coaxially arranged on a carrier in spaced relationship with one another, a shaft extending through said rings and carrier, coaxial to said rings, said carrier and shaft being axially displaceable relation to each other, said shaft including a bushing portion wherein the axial portion of said bushing portion opposite at least one of said sealing rings has a smaller diameter than a diameter which can be effectively sealed by said rings, said one ring being in an inoperative position with respect to said bushing portion, and wherein the axial portion of said bushing portion opposite at least one other of said sealing rings has a larger diameter which can be effectively sealed by said sealing rings, said other ring being in an operative position with respect to said bushing portion of said shaft.
Claim 2
Dependent Claim
147 words
A seal for a rotatable shaft, comprising: a plurality of radial lip sealing rings coaxially arranged on a carrier in spaced relationship with one another, a shaft extending through said rings and carrier, coaxial to said rings, said carrier and shaft being axially displaceable relation to each other, said shaft including a bushing portion wherein the axial portion of said bushing portion opposite at least one of said sealing rings has a smaller diameter than a diameter which can be effectively sealed by said rings, said one ring being in an inoperative position with respect to said bushing portion, and wherein the axial portion of said bushing portion opposite at least one other of said sealing rings has a larger diameter which can be effectively sealed by said sealing rings, said other ring being in an operative position with respect to said bushing portion of said shaft.
Claim 3
Dependent Claim
20 words
The seal of claim 1 wherein said bushing portion is a bushing sleeve separate from but attached to said shaft.
Claim 4
Dependent Claim
18 words
The seal of claim 1 additionally comprising means for axially displacing said carrier with respect to said shaft.
Claim 5
Dependent Claim
26 words
The seal of claim 3, wherein said displacing means comprises a spacer for mounting between the carrier and the mount to which said carrier is attached.
Claim 6
Dependent Claim
28 words
The seal of claim 3, wherein said shaft comprises two co-axially connected longitudinal sections, and said displacing means comprises a spacer for mounting between the two shaft sections.
Claim 7
Dependent Claim
26 words
The seal of claim 1, wherein the surface of the bushing portion of the shaft is chamfered between the smaller diameter and larger diameter axial portions.
Claim 8
Dependent Claim
39 words
The seal of claim 1, wherein said carrier carries at least one spare sealing ring between two other sealing rings, said spare sealing ring in an inoperative position concentric to a smaller diameter axial portion of said bushing portion.
Claim 9
Dependent Claim
50 words
The seal of claim 3, comprising at least one operative sealing ring and at least one inoperative spare sealing ring arranged at a fixed spacing from one another, and said displacing means has an axial displacement length which is different from the spacing between said operative and spare sealing rings.
References Cited (Backward Citations)
US2752175A
Cited
US2943874A
Cited
US2925291A
Cited
US3166330A
Cited
US3413008A
Cited
US3434727A
Cited
US3441284A
Cited
US3514115A
Cited
US3432172A
Cited
US3563555A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |