US3886882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mooring apparatus for ice-breaking drill ship
Assignee: Global Marine Inc
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Filing: 1973-04-23
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Granted: 1975-06-03
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Expires: 1993-04-23
Abstract
Abstract There is described a mooring system for an ice-breaking drill ship in which the vessel is positioned for drilling in icecovered waters. Positioning is controlled by multiple mooring lines going to anchors on the sea floor. The mooring lines are controlled by winches on the vessel and are directed through hawse pipes and fairleads positioned below the waterline and the bottom of ice so as to be free of ice movements.
Inventors
- 👤 Russell B Thornburg
- 👤 Klemme M Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:22
CPC Classifications
B; B63; B63B; B63B21/00; B63B21/04; B63B21/14; B63B21/50; B63B35/00; B63B35/08; B63B35/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
259 words
An ice-breaking drill ship for operation in ice-covered waters, including operation while moored over a fixed submerged location in the presence of ice movable laterally relative to the submerged location, comprising, in combination, a. a ship-form hull, b. means in the hull operable for inducing pitching motions of the hull effective at the bow, including during periods when the hull is moored, for breaking any surrounding ice below the bow, and c. means for mooring the hull to a plurality of submerged anchor points disposed about a Desired fixed submerged location and for adjusting the heading of the hull while so moored into the direction of movement of ice over the submerged location including i. a plurality of winches mounted to the hull adjacent the bow and stern thereof, ii. hawseholes in the hull in association with the winches for passage of mooring lines therethrough from the winches to the exterior of the hull, the hawseholes opening through the hull substantially below the waterline of the hull, and iii. a rotatable fairlead mounted in the hull at the opening of each hawsehole for rotation about substantially the axis of the hawsehole for guiding a mooring line into the hawsehole from the exterior of the hull from any direction, whereby the heading of the ship, while moored and during operation of the pitch inducing means, may be changed by controlled selective operation of the winches to take in and pay out mooring lines extending from the winches via the hawseholes to submerged anchor points disposed about the desired fixed location.
Claim 2
Dependent Claim
259 words
An ice-breaking drill ship for operation in ice-covered waters, including operation while moored over a fixed submerged location in the presence of ice movable laterally relative to the submerged location, comprising, in combination, a. a ship-form hull, b. means in the hull operable for inducing pitching motions of the hull effective at the bow, including during periods when the hull is moored, for breaking any surrounding ice below the bow, and c. means for mooring the hull to a plurality of submerged anchor points disposed about a Desired fixed submerged location and for adjusting the heading of the hull while so moored into the direction of movement of ice over the submerged location including i. a plurality of winches mounted to the hull adjacent the bow and stern thereof, ii. hawseholes in the hull in association with the winches for passage of mooring lines therethrough from the winches to the exterior of the hull, the hawseholes opening through the hull substantially below the waterline of the hull, and iii. a rotatable fairlead mounted in the hull at the opening of each hawsehole for rotation about substantially the axis of the hawsehole for guiding a mooring line into the hawsehole from the exterior of the hull from any direction, whereby the heading of the ship, while moored and during operation of the pitch inducing means, may be changed by controlled selective operation of the winches to take in and pay out mooring lines extending from the winches via the hawseholes to submerged anchor points disposed about the desired fixed location.
Claim 3
Dependent Claim
259 words
An ice-breaking drill ship for operation in ice-covered waters, including operation while moored over a fixed submerged location in the presence of ice movable laterally relative to the submerged location, comprising, in combination, a. a ship-form hull, b. means in the hull operable for inducing pitching motions of the hull effective at the bow, including during periods when the hull is moored, for breaking any surrounding ice below the bow, and c. means for mooring the hull to a plurality of submerged anchor points disposed about a Desired fixed submerged location and for adjusting the heading of the hull while so moored into the direction of movement of ice over the submerged location including i. a plurality of winches mounted to the hull adjacent the bow and stern thereof, ii. hawseholes in the hull in association with the winches for passage of mooring lines therethrough from the winches to the exterior of the hull, the hawseholes opening through the hull substantially below the waterline of the hull, and iii. a rotatable fairlead mounted in the hull at the opening of each hawsehole for rotation about substantially the axis of the hawsehole for guiding a mooring line into the hawsehole from the exterior of the hull from any direction, whereby the heading of the ship, while moored and during operation of the pitch inducing means, may be changed by controlled selective operation of the winches to take in and pay out mooring lines extending from the winches via the hawseholes to submerged anchor points disposed about the desired fixed location.
Claim 4
Dependent Claim
259 words
An ice-breaking drill ship for operation in ice-covered waters, including operation while moored over a fixed submerged location in the presence of ice movable laterally relative to the submerged location, comprising, in combination, a. a ship-form hull, b. means in the hull operable for inducing pitching motions of the hull effective at the bow, including during periods when the hull is moored, for breaking any surrounding ice below the bow, and c. means for mooring the hull to a plurality of submerged anchor points disposed about a Desired fixed submerged location and for adjusting the heading of the hull while so moored into the direction of movement of ice over the submerged location including i. a plurality of winches mounted to the hull adjacent the bow and stern thereof, ii. hawseholes in the hull in association with the winches for passage of mooring lines therethrough from the winches to the exterior of the hull, the hawseholes opening through the hull substantially below the waterline of the hull, and iii. a rotatable fairlead mounted in the hull at the opening of each hawsehole for rotation about substantially the axis of the hawsehole for guiding a mooring line into the hawsehole from the exterior of the hull from any direction, whereby the heading of the ship, while moored and during operation of the pitch inducing means, may be changed by controlled selective operation of the winches to take in and pay out mooring lines extending from the winches via the hawseholes to submerged anchor points disposed about the desired fixed location.
Claim 5
Dependent Claim
29 words
Apparatus of claim 1 further comprising means defining a recessed chamber surrounding the opening of each hawsehole and open to the water, the fairlead being mounted inside the chamber.
Claim 6
Dependent Claim
26 words
Apparatus of claim 2 further including a removable plate for covering the opening of each of the chambers to the water when the ship is underway.
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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |