US3734050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propulsion apparatus for a ship
Assignee: GAISHA K KITAI TEKKOSHYO
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Filing: 1971-03-30
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Granted: 1973-05-22
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Expires: 1991-03-30
Abstract
Abstract A propulsion apparatus for a ship comprises an upper vertical drive shaft rotatable about a vertical central axis in a recess in the bottom of the hull of a ship and a lower vertical drive shaft is drivingly engaged with the upper drive shaft by transmission gears and is angularly turnable around the upper drive shaft to turn therewith a propeller whose horizontal drive shaft is connected to the lower drive shaft through bevel gears. The lower drive shaft and propeller are both turnable about the upper drive shaft as a unit within a region circumscribed by the recess.
Inventors
- 👤 T Kitai
- 👤 M Kitai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:09
CPC Classifications
B; B63; B63H; B63H5/00; B63H5/07; B63H5/125; B63H25/00; B63H25/42
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
196 words
Propulsion apparatus for a ship comprising a first vertical drive shaft adapted for being externally driven in rotation, a second rotatable vertical drive shaft disposed below said first vertical drive shaft, coupling means including horizontal transmission gears respectively on said vertical shafts and in mesh with one another such that the second vertical drive shaft is driven in rotation from the first vertical drive shaft, a propeller coupled to said second vertical drive shaft for being driven thereby, support means supporting the propeller and the second vertical drive shaft for common angular movement about said first vertical drive shaft to permit adjustment in the direction of thrust generated by the propeller while preserving the coupling between the first and second vertical drive shafts, and means for producing angular movement of the support means about said first vertical drive shaft, said ship having a recess in the lower rear portion of the hull thereof, said first vertical drive shaft extending centrally in the recess in the hull, said coupling means, second vertical drive shaft, propeller and support means being confined in a region circumscribed by the boundary and the downward projection at the boundary of said recess.
Claim 2
Dependent Claim
196 words
Propulsion apparatus for a ship comprising a first vertical drive shaft adapted for being externally driven in rotation, a second rotatable vertical drive shaft disposed below said first vertical drive shaft, coupling means including horizontal transmission gears respectively on said vertical shafts and in mesh with one another such that the second vertical drive shaft is driven in rotation from the first vertical drive shaft, a propeller coupled to said second vertical drive shaft for being driven thereby, support means supporting the propeller and the second vertical drive shaft for common angular movement about said first vertical drive shaft to permit adjustment in the direction of thrust generated by the propeller while preserving the coupling between the first and second vertical drive shafts, and means for producing angular movement of the support means about said first vertical drive shaft, said ship having a recess in the lower rear portion of the hull thereof, said first vertical drive shaft extending centrally in the recess in the hull, said coupling means, second vertical drive shaft, propeller and support means being confined in a region circumscribed by the boundary and the downward projection at the boundary of said recess.
Claim 3
Dependent Claim
48 words
Propulsion apparatus as claimed in claim 1 wherein said means for producing angular movement of the support means comprises a hollow shaft surrounding said first drive shaft and connected to said support means for angular movement therewith, said first drive means being rotatably supported in said hollow shaft.
Claim 4
Dependent Claim
69 words
Propulsion apparatus as claimed in claim 2 wherein said support means comprises a transmission cover secured to said hollow shaft and covering said coupling means and said second drive shaft, a gear assembly drivingly coupling said second drive shaft and said propeller, and a gear pod secured to said transmission cover and covering said gear assembly, said propeller being supported in said gear pod to undergo angular movement therewith.
Claim 5
Dependent Claim
49 words
Propulsion apparatus as claimed in claim 3 comprising a cylindrical casing surrounding said propeller, a elongated front rib extending across said cylindrical casing to said transmission cover in front of said propeller, and a rudder extending across said cylindrical casing to said transmission cover in back of said propeller.
Claim 6
Dependent Claim
24 words
Propulsion apparatus as claimed in claim 4 wherein said front rib, rudder and propeller are confined in a region circumscribed by said transmission cover.
Claim 7
Dependent Claim
54 words
Propulsion apparatus as claimed in claim 5 wherein said first and second shafts are offset from one another, said support means and the second drive shaft, propeller, front rib and rudder being rotatable as a unit about said first drive shaft and having a center of gravity approximately aligned with the first drive shaft.
Claim 8
Dependent Claim
30 words
Propulsion apparatus as claimed in claim 1 comprising drive means for externally driving said first shaft in rotation independently of the means which produces angular movement of the support means.
Claim 9
Dependent Claim
34 words
Propulsion apparatus as claimed in claim 1 wherein said support means includes a casing enclosing said transmission gears and rotatable in the course of adjustment of the direction of thrust generated by the propeller.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |