Patent US3978411A successfully refreshed from Google Patents.
Patent US3920087A successfully refreshed from Google Patents.
US3920087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary drive and joint breakout mechanism
Assignee: Gardner Denver Inc
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Filing: 1975-01-22
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Granted: 1975-11-18
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Expires: 1995-01-22
Abstract
Abstract A rotary table drive for a blasthole drill has a pair of roller elements pivotally mounted in a table bushing and engageable with cooperative longitudinal flat sided recesses formed on the exterior of a heavy walled cylindrical drill pipe to form the rotary drive connection with the drill stem. Multiple sections of the drill pipe may be used to make up a drill stem. A pulldown traverse frame mounted for longitudinal movement along the rig mast includes a rotary coupling member connected to the top end of a drill pipe section. The traverse frame also includes a drive transfer mechanism which is engageable with the rotary table for transferring the rotary drive effort from the table through the coupling member to the drill stem when the top end of a drill pipe section is passed downward through the table bushing. The drive transfer mechanism can be nonrotatably locked to provide for breakout of the threaded joint between a drill pipe section and the coupling member. A deck mounted wrench for engaging a toothed flange on the rotary table together with a power operated holding wrench is also used to breakout drill stem connections.
Inventors
- 👤 Robert W Hisey
- 👤 Larry E Halwas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:10
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/20; E21B3/00; E21B3/02; E21B3/04; E21B7/00; E21B7/02; E21B7/021
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
219 words
In a rotary drive arrangement for rotating a drill stem on an earth drilling rig: a rotary table having a housing supporting a rotatable table member; a bushing removably fitted on said table member to be rotatably driven by said table member and including an opening in which said drill stem is disposed for longitudinal movement with respect to said table member; said drill stem comprising at least one elongated drill pipe section having recess means formed in the outer wall surface thereof, said recess means including drive surface means extending longitudinally over a major portion of said drill pipe section; means disposed on said table member for engagement with said drive surface means for rotating said drill pipe section in response to the rotation of said table member; said drill stem includes a rotary bit threadedly connected to the lower end of said drill stem; said drilling rig including a fixture removably mountable on said table member for engagement with said bit to rotate said bit in response to the rotation of said table member; and, said drilling rig further including a power operated holding wrench for engagement with said drill stem to hold said drill stem nonrotatable while said bit is rotated by said fixture to release the threaded connection between said bit and said drill stem.
Claim 2
Dependent Claim
219 words
In a rotary drive arrangement for rotating a drill stem on an earth drilling rig: a rotary table having a housing supporting a rotatable table member; a bushing removably fitted on said table member to be rotatably driven by said table member and including an opening in which said drill stem is disposed for longitudinal movement with respect to said table member; said drill stem comprising at least one elongated drill pipe section having recess means formed in the outer wall surface thereof, said recess means including drive surface means extending longitudinally over a major portion of said drill pipe section; means disposed on said table member for engagement with said drive surface means for rotating said drill pipe section in response to the rotation of said table member; said drill stem includes a rotary bit threadedly connected to the lower end of said drill stem; said drilling rig including a fixture removably mountable on said table member for engagement with said bit to rotate said bit in response to the rotation of said table member; and, said drilling rig further including a power operated holding wrench for engagement with said drill stem to hold said drill stem nonrotatable while said bit is rotated by said fixture to release the threaded connection between said bit and said drill stem.
Claim 3
Dependent Claim
66 words
The invention set forth in claim 1 wherein: said holding wrench comprises a base pivotally mounted on said drilling rig for moving said holding wrench from a retracted position to a position for engaging said drill stem, and said holding wrench includes a pair of power operated movable jaws for engagement with said drill stem to hold at least a portion of said drill stem nonrotatably.
Claim 4
Dependent Claim
27 words
The invention set forth in claim 2 wherein: said holding wrench includes means for engaging said fixture for moving said fixture on and off said rotary table.
Claim 5
Dependent Claim
197 words
In a rotary drive arrangement for rotating a drill stem on an earth drilling rig: a rotary table having a housing supporting a rotatable table member including a radially extending flange having toothlike projections thereon; a bushing removably fitted on said table member to be rotatably driven by said table member and including an opening in which said drill stem is disposed for longitudinal movement with respect to said table member; said drill stem comprising at least one elongated drill pipe section having recess means formed in the outer wall surface thereof, said recess means including drive surface means extending longitudinally over a major portion of said drill pipe section; means disposed on said table member for engagement with said drive surface means for rotating said drill pipe section in response to the rotation of said member; a drill stem holding wrench mounted on said drilling rig and engageable with said drive surface means for holding said drill pipe section nonrotatable; and, an arm including a hook portion for engaging one of said projections on said flange and pressure fluid cylinder and piston means connected to said arm for moving said arm to rotate said table member.
Claim 6
Dependent Claim
197 words
In a rotary drive arrangement for rotating a drill stem on an earth drilling rig: a rotary table having a housing supporting a rotatable table member including a radially extending flange having toothlike projections thereon; a bushing removably fitted on said table member to be rotatably driven by said table member and including an opening in which said drill stem is disposed for longitudinal movement with respect to said table member; said drill stem comprising at least one elongated drill pipe section having recess means formed in the outer wall surface thereof, said recess means including drive surface means extending longitudinally over a major portion of said drill pipe section; means disposed on said table member for engagement with said drive surface means for rotating said drill pipe section in response to the rotation of said member; a drill stem holding wrench mounted on said drilling rig and engageable with said drive surface means for holding said drill pipe section nonrotatable; and, an arm including a hook portion for engaging one of said projections on said flange and pressure fluid cylinder and piston means connected to said arm for moving said arm to rotate said table member.
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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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |