Patent US4647099A successfully refreshed from Google Patents.
US4647099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lifting head
Assignee: Hughes Tool Co
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Filing: 1986-02-04
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Granted: 1987-03-03
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Expires: 2006-02-04
Abstract
Abstract A lifting head having a gate arm, and a latch arm, pivotally secured to a frame. A clamping block, also mounted on the frame, is movable between a retracted position away from the drill collar and an extended position against the drill collar. A plurality of gripping inserts are located on the clamping block and on the gate arm. Each insert has a body and a plurality of teeth. The bodies of the inserts may be vertical or angled, but the teeth of the inserts are mounted in a spiral. This allows the inserts to grip the drill collar, even if the lifting head grips the collar at a place having a spiral groove.
Inventors
- 👤 Joe R. Berry
- 👤 Archie L. Black
- 👤 William R. Hamilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:11
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/16; E21B19/00; E21B19/02; E21B19/06; E21B19/14; Y; Y10; Y10S; Y10S294/00; Y10S294/902
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
131 words
A lifting head for lifting a drill collar, the lifting head comprising: a frame; a gate arm, pivotally secured to the frame; a latch arm, pivotally secured to the frame; a clamping block, reciprocally movable between a retracted position away from the drill collar and an extended position against the drill collar; means for moving the clamping block reciprocally between the retracted position and the extended position, to force the drill collar against the gate arm; means for pivoting the gate arm between an open position and a closed position; means for pivoting the latch arm between an open position and a closed position; a gripping insert, on the clamping block, for gripping the drill collar, the gripping insert having a plurality of teeth, the teeth being mounted in a spiral.
Claim 2
Dependent Claim
131 words
A lifting head for lifting a drill collar, the lifting head comprising: a frame; a gate arm, pivotally secured to the frame; a latch arm, pivotally secured to the frame; a clamping block, reciprocally movable between a retracted position away from the drill collar and an extended position against the drill collar; means for moving the clamping block reciprocally between the retracted position and the extended position, to force the drill collar against the gate arm; means for pivoting the gate arm between an open position and a closed position; means for pivoting the latch arm between an open position and a closed position; a gripping insert, on the clamping block, for gripping the drill collar, the gripping insert having a plurality of teeth, the teeth being mounted in a spiral.
Claim 3
Dependent Claim
124 words
A lifting head for lifting a drill collar, the lifting head comprising: a frame; a gate arm, pivotally secured to the frame; a latch arm, pivotally secured to the frame; a clamping block, reciprocally movable between a retracted position away from the drill collar and an extended position against the drill collar; means for moving the clamping block reciprocally between the retracted position and the extended position, to force the drill collar against the gate arm; means for pivoting the gate arm between an open position and a closed position; means for pivoting the latch arm between an open position and a closed position; a gripping insert, on the clamping block, for gripping the drill collar, the gripping insert having a spiral gripping surface.
Claim 4
Dependent Claim
124 words
A lifting head for lifting a drill collar, the lifting head comprising: a frame; a gate arm, pivotally secured to the frame; a latch arm, pivotally secured to the frame; a clamping block, reciprocally movable between a retracted position away from the drill collar and an extended position against the drill collar; means for moving the clamping block reciprocally between the retracted position and the extended position, to force the drill collar against the gate arm; means for pivoting the gate arm between an open position and a closed position; means for pivoting the latch arm between an open position and a closed position; a gripping insert, on the clamping block, for gripping the drill collar, the gripping insert having a spiral gripping surface.
Claim 5
Dependent Claim
133 words
A lifting head for lifting a drill collar having spiral grooves, the lifting head comprising: a frame; a gate arm, pivotally secured to the frame; a latch arm, pivotally secured to the frame; a clamping block, reciprocally movable between a retracted position away from the drill collar and an extended position against the drill collar; means for moving the clamping block reciprocally between the retracted position and the extended position, to force the drill collar against the gate arm; means for pivoting the gate arm between an open position and a closed position; means for pivoting the latch arm between an open position and a closed position; a plurality of gripping inserts, on the clamping block and on the gate arm, for gripping the drill collar, the gripping inserts having spiral gripping surfaces.
Claim 6
Dependent Claim
133 words
A lifting head for lifting a drill collar having spiral grooves, the lifting head comprising: a frame; a gate arm, pivotally secured to the frame; a latch arm, pivotally secured to the frame; a clamping block, reciprocally movable between a retracted position away from the drill collar and an extended position against the drill collar; means for moving the clamping block reciprocally between the retracted position and the extended position, to force the drill collar against the gate arm; means for pivoting the gate arm between an open position and a closed position; means for pivoting the latch arm between an open position and a closed position; a plurality of gripping inserts, on the clamping block and on the gate arm, for gripping the drill collar, the gripping inserts having spiral gripping surfaces.
Claim 7
Dependent Claim
141 words
A lifting head for lifting a drill collar having spiral grooves, the lifting head comprising: a frame; a gate arm, pivotally secured to the frame; a latch arm, pivotally secured to the frame; a clamping block, reciprocally movable between a retracted position away from the drill collar and an extended position against the drill collar; means for moving the clamping block reciprocally between the retracted position and the extended position, to force the drill collar against the gate arm; means for pivoting the gate arm between an open position and a closed position; means for pivoting the latch arm between an open position and a closed position; a gripping insert, on the clamping block, for gripping the drill collar, the gripping insert having a spiral gripping surface, so that the gripping insert can grip the spiral grooves of the drill collar.
Claim 8
Dependent Claim
141 words
A lifting head for lifting a drill collar having spiral grooves, the lifting head comprising: a frame; a gate arm, pivotally secured to the frame; a latch arm, pivotally secured to the frame; a clamping block, reciprocally movable between a retracted position away from the drill collar and an extended position against the drill collar; means for moving the clamping block reciprocally between the retracted position and the extended position, to force the drill collar against the gate arm; means for pivoting the gate arm between an open position and a closed position; means for pivoting the latch arm between an open position and a closed position; a gripping insert, on the clamping block, for gripping the drill collar, the gripping insert having a spiral gripping surface, so that the gripping insert can grip the spiral grooves of the drill collar.
Claim 9
Dependent Claim
148 words
A lifting head for lifting a drill collar having spiral grooves, the lifting head comprising: a frame; a gate arm, pivotally secured to the frame; a latch arm, pivotally secured to the frame; a clamping block, reciprocally movable between a retracted position away from the drill collar and an extended position against the drill collar; means for moving the clamping block reciprocally between the retracted position and the extended position, to force the drill collar against the gate arm; means for pivoting the gate arm between an open position and a closed position; means for pivoting the latch arm between an open position and a closed position; a plurality of gripping inserts, on the clamping block and on the gate arm, for gripping the drill collar, the gripping inserts having a spiral gripping surface, so that the gripping inserts can grip the spiral grooves of the drill collar.
Claim 10
Dependent Claim
148 words
A lifting head for lifting a drill collar having spiral grooves, the lifting head comprising: a frame; a gate arm, pivotally secured to the frame; a latch arm, pivotally secured to the frame; a clamping block, reciprocally movable between a retracted position away from the drill collar and an extended position against the drill collar; means for moving the clamping block reciprocally between the retracted position and the extended position, to force the drill collar against the gate arm; means for pivoting the gate arm between an open position and a closed position; means for pivoting the latch arm between an open position and a closed position; a plurality of gripping inserts, on the clamping block and on the gate arm, for gripping the drill collar, the gripping inserts having a spiral gripping surface, so that the gripping inserts can grip the spiral grooves of the drill collar.
Claim 11
Dependent Claim
168 words
A lifting head for lifting a drill collar having spiral grooves, the lifting head comprising: a frame; a gate arm, pivotally secured to the frame; a latch arm, pivotally secured to the frame; a clamping block, reciprocally movable between a retracted position away from the drill collar and an extended position against the drill collar, the clamping block having a vertical insert slot; means for moving the clamping block reciprocally between the retracted position and the extended position, to force the drill collar against the gate arm; means for pivoting the gate arm between an open position and a closed position; means for pivoting the latch arm between an open position and a closed position; a gripping insert, on the clamping block, for gripping the drill collar, the gripping insert having a body and a plurality of teeth, the body being located in the insert slot, and the teeth being mounted in a spiral, so that the gripping insert can grip the spiral grooves of the drill collar.
Claim 12
Dependent Claim
168 words
A lifting head for lifting a drill collar having spiral grooves, the lifting head comprising: a frame; a gate arm, pivotally secured to the frame; a latch arm, pivotally secured to the frame; a clamping block, reciprocally movable between a retracted position away from the drill collar and an extended position against the drill collar, the clamping block having a vertical insert slot; means for moving the clamping block reciprocally between the retracted position and the extended position, to force the drill collar against the gate arm; means for pivoting the gate arm between an open position and a closed position; means for pivoting the latch arm between an open position and a closed position; a gripping insert, on the clamping block, for gripping the drill collar, the gripping insert having a body and a plurality of teeth, the body being located in the insert slot, and the teeth being mounted in a spiral, so that the gripping insert can grip the spiral grooves of the drill collar.
Claim 13
Dependent Claim
187 words
A lifting head for lifting a drill collar having spiral grooves, the lifting head comprising: a frame; a gate arm, pivotally secured to the frame, the gate arm having a plurality of vertical insert slots; a latch arm, pivotally secured to the frame; a clamping block, reciprocally movable between a retracted position away from the drill collar and an extended position against the drill collar, the clamping block having a plurality of vertical insert slots; means for moving the clamping block reciprocally between the retracted position and the extended position, to force the drill collar against the gate arm; means for pivoting the gate arm between an open position and a closed position; means for pivoting the latch arm between an open position and a closed position; a plurality of gripping inserts, on the clamping block and on the gate arm, for gripping the drill collar, each gripping insert having a body and a plurality of teeth, each body being located in an insert slot, and the teeth being mounted in a spiral, so that the gripping inserts can grip the spiral grooves of the drill collar.
Claim 14
Dependent Claim
187 words
A lifting head for lifting a drill collar having spiral grooves, the lifting head comprising: a frame; a gate arm, pivotally secured to the frame, the gate arm having a plurality of vertical insert slots; a latch arm, pivotally secured to the frame; a clamping block, reciprocally movable between a retracted position away from the drill collar and an extended position against the drill collar, the clamping block having a plurality of vertical insert slots; means for moving the clamping block reciprocally between the retracted position and the extended position, to force the drill collar against the gate arm; means for pivoting the gate arm between an open position and a closed position; means for pivoting the latch arm between an open position and a closed position; a plurality of gripping inserts, on the clamping block and on the gate arm, for gripping the drill collar, each gripping insert having a body and a plurality of teeth, each body being located in an insert slot, and the teeth being mounted in a spiral, so that the gripping inserts can grip the spiral grooves of the drill collar.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |