Patent US2906178A successfully refreshed from Google Patents.
Patent US3726531A successfully refreshed from Google Patents.
US3726531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stern tube seal
Assignee: American Metal Bearing Co
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Filing: 1970-12-07
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Granted: 1973-04-10
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Expires: 1990-12-07
Abstract
Abstract A stern tube seal installation comprising an aft seal unit and a forward seal unit, each unit including a lubricant filled seal chamber confronting a propeller shaft or liner thereon, the seal chamber containing a rotation restrained floating ring sealed at its ends with respect to the chamber and spaced from the shaft by a centering ring flanked by at least a pair of seal rings engaging the shaft. Lubricant passages extend through the floating ring and centering ring to the shaft liner between the seal rings.
Inventors
- 👤 P Mitchell
- 👤 P Pagan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:03
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3204; F16J15/3224
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
209 words
The combination with a stern tube having a bearing assembly therein journalling a propeller shaft, of a shaft sealing unit at an end of the stern tube, said shaft seal unit, comprising: a. means defining an axially extending annular lubricant receiving chamber confronting the shaft and having end walls with planar radial surfaces extending into close proximity to said shaft; b. a non-rotating, axially extending freeLy radially floating and radially perforated cylindrical partition received in the chamber surrounding the shaft and dividing the chamber into radially inner and radially outer lubricant receiving chamber portions, said partition defining the outer wall of said radially inner chamber portion; c. seals at the axial ends of the floating partition cooperating between the axial ends of the partition and end walls; d. a low friction centering ring supporting the floating partition in essentially concentric relation to the shaft and radially perforated for communication with the perforations in the floating ring to conduct lubricant from the lubricant receiving chamber to the shaft; e. and seal rings positioned in said radially inner chamber portion, abutting and flanking the centering ring, sealingly engaging the shaft, and extending between said end walls into sealing engagement with said partition and with portions thereof engaging said planar end walls.
Claim 2
Dependent Claim
209 words
The combination with a stern tube having a bearing assembly therein journalling a propeller shaft, of a shaft sealing unit at an end of the stern tube, said shaft seal unit, comprising: a. means defining an axially extending annular lubricant receiving chamber confronting the shaft and having end walls with planar radial surfaces extending into close proximity to said shaft; b. a non-rotating, axially extending freeLy radially floating and radially perforated cylindrical partition received in the chamber surrounding the shaft and dividing the chamber into radially inner and radially outer lubricant receiving chamber portions, said partition defining the outer wall of said radially inner chamber portion; c. seals at the axial ends of the floating partition cooperating between the axial ends of the partition and end walls; d. a low friction centering ring supporting the floating partition in essentially concentric relation to the shaft and radially perforated for communication with the perforations in the floating ring to conduct lubricant from the lubricant receiving chamber to the shaft; e. and seal rings positioned in said radially inner chamber portion, abutting and flanking the centering ring, sealingly engaging the shaft, and extending between said end walls into sealing engagement with said partition and with portions thereof engaging said planar end walls.
Claim 3
Dependent Claim
40 words
A shaft seal unit, as defined in claim 1, wherein: a. said seal rings include a sea water excluding ring and a backing seal ring aft of the centering ring, and a lubricant retention ring forward of the centering ring.
Claim 4
Dependent Claim
29 words
The combination of claim 1 including: means defining a lubricant supply chamber and means for conducting lubricant from said lubricant supply chamber to said radially outer lubricant receiving chamber.
Claim 5
Dependent Claim
24 words
The combination of claim 1 wherein said seal rings engage said partition, centering ring and end wall but are otherwise free of securement thereto.
Claim 6
Dependent Claim
42 words
The combination of claim 1 wherein said seal rings are of generally C-shape having spaced legs and an intermediate portion, said legs sealingly engaging said shaft and partition, respectively, with said intermediate portion engaging one of said centering ring and end wall.
Claim 7
Dependent Claim
27 words
The combination of claim 5 wherein the seal rings on opposite sides of said centering ring are oriented with their legs pointing in respectively opposite axial directions.
Claim 8
Dependent Claim
27 words
The combination of claim 5 wherein the seal rings on opposite sides of said centering ring are oriented with their legs pointing in the same axial direction.
References Cited (Backward Citations)
US3413008A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |