US3921823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Movement compensating apparatus for floating drilling
Assignee: Groupement Activities Atomiques Advancees
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Filing: 1974-01-30
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Granted: 1975-11-25
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Expires: 1994-01-30
Abstract
Abstract A derrick mounted on a ship has three automatic pipe shifting units that compensate for the sway of the vessel during a drilling operation at sea. Both rotary and reciprocal movement are provided by jack members and turrets. Gripping jaws permit the rotation of the held pipe, while aligning flanges insure precise location. The middle shifting unit provides a vertical jack member for elevating its respective gripping jaw.
Inventors
- 👤 Rene Bourree
- 👤 Michel Brin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:52
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/14; E21B19/002
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
155 words
Apparatus for automatically shifting sections of pipe back and forth between operational and storage positions in a derrick which is part of a floating drilling rig, said apparatus comprising at least two shifting units arranged vertically in the derrick, each of said shifting units comprising: a. a carriage movably mounted for horizontal movement on a frame fixedly connected to the derrick; b. means for radially moving said carriage; c. a turret rotatably mounted on said carriage; d. means comprising at least one rotation jack for rotating said turret on said carriage; e. an arm movably mounted on said turret, said arm comprising a horizontal part and a vertical part; f. means comprising a jack for effecting horizontal movement of said arm oN said turret; g. gripping means mounted on the vertical part of said arm; and h. means comprising a jack mounted on said arm for controlling the opening and closing of said gripping means.
Claim 2
Dependent Claim
155 words
Apparatus for automatically shifting sections of pipe back and forth between operational and storage positions in a derrick which is part of a floating drilling rig, said apparatus comprising at least two shifting units arranged vertically in the derrick, each of said shifting units comprising: a. a carriage movably mounted for horizontal movement on a frame fixedly connected to the derrick; b. means for radially moving said carriage; c. a turret rotatably mounted on said carriage; d. means comprising at least one rotation jack for rotating said turret on said carriage; e. an arm movably mounted on said turret, said arm comprising a horizontal part and a vertical part; f. means comprising a jack for effecting horizontal movement of said arm oN said turret; g. gripping means mounted on the vertical part of said arm; and h. means comprising a jack mounted on said arm for controlling the opening and closing of said gripping means.
Claim 3
Dependent Claim
39 words
Apparatus as claimed in claim 1 wherein said gripping means is movably counted on the vertical part of said arm and further comprising means for effecting vertical movement of said gripping means on the vertical part of said arm.
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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |