US3842773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hull construction method employing hull construction work units
Assignee: IHI Corp
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Filing: 1971-06-11
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Granted: 1974-10-22
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Expires: 1991-06-11
Abstract
Abstract A hull construction method whereby the lower layer of the hull is subjected to construction operation by means of a lower work unit, and an upper work unit is movably placed on the thus constructed lower layer of the hull so that the construction operation of the upper layer of the hull is conducted by the said upper work unit.
Inventors
- 👤 H Kurose
- 👤 K Aoyagi
- 👤 N Uchiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:54
CPC Classifications
B; B63; B63C; B63C5/00; B63C5/02; B63C2005/025
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
176 words
A method for constructing a hull having center and wing tanks formed from prefabricated blocks which comprises assembling adjacent wing and center tank blocks; deploying a lower work unit in the form of a gantry with legs to straddle a wing tank block and a contiguous wall of a center tank block with one of said legs within the center tank block and the other outside of said blocks; securing said wing and center tank blocks from work stages on said lower unit; moving said lower work unit longitudinally of the hull to a new work site; disposing rails upon upper structural elements of said wing and center tank blocks secured by said lower work unit; mounting an upper work unit on said rails for movement therealong, said upper work units comprising work platforms movable between extended, operable positions and retracted, transport positions; completing upper hull structures from said work platforms in said operable positions; moving said platforms to said retracted positions and advancing said upper work units to a different work site within the hull.
Claim 2
Independent Claim
176 words
A method for constructing a hull having center and wing tanks formed from prefabricated blocks which comprises assembling adjacent wing and center tank blocks; deploying a lower work unit in the form of a gantry with legs to straddle a wing tank block and a contiguous wall of a center tank block with one of said legs within the center tank block and the other outside of said blocks; securing said wing and center tank blocks from work stages on said lower unit; moving said lower work unit longitudinally of the hull to a new work site; disposing rails upon upper structural elements of said wing and center tank blocks secured by said lower work unit; mounting an upper work unit on said rails for movement therealong, said upper work units comprising work platforms movable between extended, operable positions and retracted, transport positions; completing upper hull structures from said work platforms in said operable positions; moving said platforms to said retracted positions and advancing said upper work units to a different work site within the hull.
Claim 3
Dependent Claim
32 words
A method as claimed in claim 1 wherein said lower work unit comprises movable work stages, said stages being moved at each work site for the completion of assignments at that site.
Claim 4
Dependent Claim
25 words
A method as claimed in claim 2 wherein said work stages of said lower work unit are moved vertically and horizontally at each work site.
Claim 5
Dependent Claim
24 words
A method as claimed in claim 3 wherein said work stages are suspended from carriages and said carriages are moved transversely of the hull.
Claim 6
Dependent Claim
17 words
A method as claimed in claim 1 which comprises forming a roof on said lower work unit.
Claim 7
Dependent Claim
30 words
A method as claimed in claim 1 wherein said lower work unit is moved to a new work site by lifting said unit and moving it longitudinally of the hull.
Claim 8
Dependent Claim
34 words
A method as claimed in claim 1 wherein said gantry type lower work unit has one leg thereof disposed on the ground and another disposed on a structural element of said center tank block.
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) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |