US3557744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aft structures of marine vessels
Assignee: GIACIER METAL CO Ltd
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Filing: 1968-12-11
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Granted: 1971-01-26
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Expires: 1988-12-11
Abstract
Abstract A stern construction for a ship having a propeller with detachable blades includes a passage over the propeller through which the blades can be lifted into the ship. The propeller boss is made integral with the shaft and the blades have flanges which are bolted in recesses in the boss. Provision is made for locating the blades at a required pitch and for purging the space between the blade and the boss as each blade is fitted.
Inventors
- 👤 Colin Wray Redcar Herbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:04
CPC Classifications
B; B63; B63B; B63B17/00; B63B17/0018; B63B3/00; B63B3/14; B63B3/40; B63H; B63H1/00; B63H1/02; B63H1/12; B63H1/14; B63H1/20; B63H1/26
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
65 words
A stern construction in a marine vessel comprising a propeller shaft, a propeller boss on said shaft, propeller blades having flanges at their roots, mating faces on said flanges and said boss, and bolts detachably securing said blade flanges to said boss, and means for providing a flow of purging fluid between said mating faces during attachment of each of said blades to said boss.
Claim 2
Dependent Claim
65 words
A stern construction in a marine vessel comprising a propeller shaft, a propeller boss on said shaft, propeller blades having flanges at their roots, mating faces on said flanges and said boss, and bolts detachably securing said blade flanges to said boss, and means for providing a flow of purging fluid between said mating faces during attachment of each of said blades to said boss.
Claim 3
Dependent Claim
47 words
A stern construction as claimed in claim 1 in which said means for providing a flow of purging fluid comprise an inlet in each of said blade flanges for the admission of purging fluid under pressure and at least one outlet valve in one of said bolts.
Claim 4
Dependent Claim
66 words
A stern construction as claimed in claim 1 having a seating in the root of each blade and a locating spigot projecting from the boss and cooperating with said seating to locate the blade and to define a space between said spigot and said seating, said means for providing a flow of purging fluid comprising an inlet valve in said blade flange communicating with said space.
Claim 5
Dependent Claim
71 words
A stern construction as claimed in claim 3 having recesses in the propeller boss in which said blade flanges are received, a sealing ring between the periphery of each blade flange and the boss recess in which it is received, passages for the flow of purging fluid from said space across the mating faces of the blade flange and the boss, and at least one outlet valve for the purging fluid.
Claim 6
Dependent Claim
30 words
A stern construction as claimed in claim 4 wherein each of the securing bolts has an axial bore therein and an outlet valve for purging fluid in said axial bore.
Claim 7
Dependent Claim
16 words
A stern construction as claimed in claim 1 wherein said boss is integral with said shaft.
Claim 8
Dependent Claim
96 words
A stern construction as claimed in claim 1 having a stern structure overhanging said propeller, a closable passage in said stern structure opening over said propeller boss, said passage being constructed for the passage of said propeller blades, and means for lifting said blades through said passage. 8, A stern construction as claimed in claim 7 comprising a removable watertight cover for closing said passage, said cover being disposed in said passage above the waterline and having attached to it a fairing continuing the outline of the stern structure at the lower end of the passage.
Claim 9
Dependent Claim
31 words
A stern construction as claimed in claim 1 having sockets in said propeller boss and blades and dowels received in said sockets and locating said blades with respect to said boss.
Claim 10
Dependent Claim
24 words
A stern construction as claimed in claim 9 having additional sockets for receiving the dowels, whereby the pitch of the blades may be adjusted.
References Cited (Backward Citations)
US20751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |