Patent US3736993A successfully refreshed from Google Patents.
US3736993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High torque boring machine
Assignee: Robbins Co
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Filing: 1971-07-15
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Granted: 1973-06-05
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Expires: 1991-07-15
Abstract
Abstract A traveling support frame is mounted for up and down travel along upstanding guide columns. Drilling equipment is carried by the traveling frame. The drilling equipment includes a drive head and means coupling it to a rotary drive member in such a way that bending forces imposed on the drill stem are not transmitted by the drill head to such drive member.
Inventors
- 👤 H West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:34
CPC Classifications
E; E21; E21B; E21B3/00; E21B3/02; E21B3/022
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
176 words
In a drilling mechanism comprising upstanding guide column means, traveling cross frame means mounted for precision up and down travel along said column means, and drilling equipment carried by said traveling cross frame means and including a rotary drill head connectible to drill pipe, motor means and drive transmission means drivingly connecting said motor means to said drill head, the improvement characterized by: said drill head comprising means mounting it on the traveling cross frame means, including bearing means for carrying both axial and radial loads, said bearing means also serving tO mount the drive head for limited pivotal movement relative to said traveling cross frame means so that the drive head can tilt sideways in response to bending forces imposed by the drill pipe; said drive transmission means including a drive member, and means interconnecting said drive member and said drill head for rotary motion transmission from the former to the latter, said means being capable of transmitting very little or none of the sideways tilting movement of the drill head to said drive member.
Claim 2
Dependent Claim
176 words
In a drilling mechanism comprising upstanding guide column means, traveling cross frame means mounted for precision up and down travel along said column means, and drilling equipment carried by said traveling cross frame means and including a rotary drill head connectible to drill pipe, motor means and drive transmission means drivingly connecting said motor means to said drill head, the improvement characterized by: said drill head comprising means mounting it on the traveling cross frame means, including bearing means for carrying both axial and radial loads, said bearing means also serving tO mount the drive head for limited pivotal movement relative to said traveling cross frame means so that the drive head can tilt sideways in response to bending forces imposed by the drill pipe; said drive transmission means including a drive member, and means interconnecting said drive member and said drill head for rotary motion transmission from the former to the latter, said means being capable of transmitting very little or none of the sideways tilting movement of the drill head to said drive member.
Claim 3
Dependent Claim
82 words
The drilling mechanism improvement of claim 1, wherein said bearing means comprises vertically spaced apart upper and lower bearing assemblies, each having fixed and rotatable bearing races, said bearing races having spherically curved race surfaces with one race surface of each bearing facing inwardly towards a center of curvature which is substantially common with the inwardly facing race of the other bearing, with said bearing races serving to mount the drive head for limited pivotal movement substantially about said center of curvature.
Claim 4
Dependent Claim
35 words
The drilling mechanism improvement of claim 2, further comprising a plurality of roller elements between said races, said roller elements being longitudinally curved, and of a curvature and attitude to mate with said race surfaces.
Claim 5
Dependent Claim
61 words
The drilling mechanism improvement of claim 1, wherein said drill head includes an outer portion supported by said bearing means and an inner portion mounted for limited axial movement relative to said outer portion but coupled thereto for conjoint rotation therewith, said inner portion carrying a tool joint component connectible to a complementary tool joint component on a drill pipe member.
Claim 6
Dependent Claim
61 words
The drilling mechanism improvement of claim 4, wherein said drive member includes a portion which projects into the outer portion of said drive head, and connection means between said drive member portion and said drive head outer portion serving to couple them together for conjoint rotation, but permitting said drive head outer member to tilt relative to said drive member portion.
Claim 7
Dependent Claim
82 words
The drilling mechanism improvement of claim 5, wherein said bearing means comprises vertically spaced apart upper and lower bearing assemblies, each having fixed and rotatable bearing races, said bearing races having spherically curved race surfaces with one race surface of each bearing facing inwardly towards a center of curvature which is substantially common with the inwardly facing race of the other bearing, with said bearing races serving to mount the drive head for limited pivotal movement substantially about said center of curvature.
Claim 8
Dependent Claim
35 words
The drilling mechanism improvement of claim 6, further comprising a plurality of roller elements between said races, said roller elements being longitudinally curved, and of a curvature and attitude to mate with said race surfaces.
References Cited (Backward Citations)
US1398551A
Cited
US2863638A
Cited
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 |