Patent US3736898A successfully refreshed from Google Patents.
US3736898A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for controlling list and level of pontoon
Assignee: Mitsui Engineering and Shipbuilding Co Ltd
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Filing: 1970-11-18
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Granted: 1973-06-05
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Expires: 1990-11-18
Abstract
Abstract For a floating dry dock comprising a plurality of pontoons which are interconnected, means for leveling each pontoon. The apparatus has two interconnected systems, one of which corrects the list or inclination of the pontoon and the other of which controls the depth of flotation. Each pontoon has a vertical pipe with a float in it which is responsive to the depth of flotation which operates an indicator for the second system. Automatic controls may be provided for both systems and the systems for each pontoon may be coupled with the systems for the other pontoons in the dry dock.
Inventors
- 👤 I Yamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:55
CPC Classifications
B; B63; B63C; B63C1/00; B63C1/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
207 words
In a device for controlling list and waterline level of pontoon characterized in that the interior of the pontoon is divded by watertight bulkheads into front and rear compartments, right and left compartments and a central compartment, piping and reversible flow-effecting means for communicating said front compartment with rear compartment to correct fore and aft list without substantial change in the water-line level, second piping and reversible flow-effecting means communicating said right compartment with left compartment to correct port and starboard list without substantial change in the water line level, and third piping and reversible flow effecting means communicating said central compartment with outside water to control the waterline level without substantial change in list, said reversible flow-effecting means comprising a unidirectional pump, a circular pipe encircling said pump, a pair of three-way valves connecting the intake and exhaust of said pump with said circular pipe, said two valves dividing said circular pipe into separated segments, and a flow pipe connected to each segment so that by manipulation of said valves, operation of said pump effects flow into one flow pipe and out the other, or effects flow out the one and into the other, or effects flow through the pump without flow through said flow pipes.
Claim 2
Dependent Claim
207 words
In a device for controlling list and waterline level of pontoon characterized in that the interior of the pontoon is divded by watertight bulkheads into front and rear compartments, right and left compartments and a central compartment, piping and reversible flow-effecting means for communicating said front compartment with rear compartment to correct fore and aft list without substantial change in the water-line level, second piping and reversible flow-effecting means communicating said right compartment with left compartment to correct port and starboard list without substantial change in the water line level, and third piping and reversible flow effecting means communicating said central compartment with outside water to control the waterline level without substantial change in list, said reversible flow-effecting means comprising a unidirectional pump, a circular pipe encircling said pump, a pair of three-way valves connecting the intake and exhaust of said pump with said circular pipe, said two valves dividing said circular pipe into separated segments, and a flow pipe connected to each segment so that by manipulation of said valves, operation of said pump effects flow into one flow pipe and out the other, or effects flow out the one and into the other, or effects flow through the pump without flow through said flow pipes.
Claim 3
Dependent Claim
49 words
A device according to claim 1 including a vertical pipe extending upwardly from the bottom of the pontoon, a float in said pipe and a pulley supporting said float at the water level whereby a change in the water line level of said pontoon effects rotation of said pulley.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |