Patent US3579752A successfully refreshed from Google Patents.
US3579752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic rotary slips
Assignee: Individual
•
Filing: 1970-04-09
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Granted: 1971-05-25
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Expires: 1990-04-09
Abstract
Abstract Automatic slips mountable in a rotary table for gripping and releasing drill pipe or casing being run through the table and for rotating the pipe when desired. The mechanism includes a slip spider which is raised and lowered by fluid pressure operated pistons and is held in a balanced position by telescopic supports mounted on the rotary table housing in a symmetrical arrangement about the pistons.
Inventors
- 👤 Cicero C Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:12
CPC Classifications
E; E21; E21B; E21B3/00; E21B3/02; E21B3/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
Automatic rotary slips, comprising: a. a slip bowl seatable in a rotary table for rotation thereby; b. a stationary base disposed about said rotary table; c. a hoRizontally disposed lifting ring vertically spaced from the top of the slip bowl; d. fluid pressure operated means mounted on the base for vertically reciprocating said lifting ring; e. stabilizing means mounted on the base and connected to said lifting ring to maintain the latter in level horizontal position during its vertical reciprocation; f. a plurality of pipe-gripping slips disposed in the slip bowl for radial movement in response to their vertical movement; and g. horizontally disposed tongue-and-groove means connecting said lifting ring to the slips to effect said vertical movement thereof.
Claim 2
Dependent Claim
119 words
Automatic rotary slips, comprising: a. a slip bowl seatable in a rotary table for rotation thereby; b. a stationary base disposed about said rotary table; c. a hoRizontally disposed lifting ring vertically spaced from the top of the slip bowl; d. fluid pressure operated means mounted on the base for vertically reciprocating said lifting ring; e. stabilizing means mounted on the base and connected to said lifting ring to maintain the latter in level horizontal position during its vertical reciprocation; f. a plurality of pipe-gripping slips disposed in the slip bowl for radial movement in response to their vertical movement; and g. horizontally disposed tongue-and-groove means connecting said lifting ring to the slips to effect said vertical movement thereof.
Claim 3
Dependent Claim
62 words
Automatic rotary slips according to claim 1 wherein said fluid pressure operated means comprises: a. a pair of vertically disposed cylinders positioned on diametrically opposite sides of said slip bowl; b. pistons longitudinally slidable in said cylinders and rigidly connected to said lifting ring; and c. pressure fluid conduits communicating with the interior of said cylinders on opposite sides of said pistons.
Claim 4
Dependent Claim
34 words
Automatic rotary slips according to claim 1 wherein said stabilizing means comprises: a. a pair of dashpot means disposed in symmetrically spaced relation on opposite sides of each of said fluid pressure operated means.
Claim 5
Dependent Claim
32 words
Automatic rotary slips according to claim 1 including cooperating spline means carried by said slips and slip bowl for securing said slips to said slip bowl during said radial and vertical movement.
Claim 6
Dependent Claim
73 words
Automatic rotary slips according to claim 1 wherein said tongue-and-groove means comprises: a. annular flange means mounted in horizontally disposed spaced relation below said lifting ring to surround the upper end portions of said slips; and b. horizontal grooves in the exteriors of the upper end portions of said slips to slidably receive the lip of said flange means to accommodate said radial movement of said slips responsive to the vertical movement thereof.
Claim 7
Dependent Claim
25 words
Automatic rotary slips according to claim 5 including: a. antifriction bearing means arranged between said upper end portions of said slips and said flange means.
Claim 8
Dependent Claim
59 words
Automatic rotary slips according to claim 1 wherein each of said pipe-gripping slips includes: a. a body having a longitudinally extending dovetail slot in the inner face thereof; b. a plurality of correspondingly shaped tooth dies mounted in said slot, the teeth on said dies being V-shaped in transverse cross section and having upwardly facing buttress shape in profile.
References Cited (Backward Citations)
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Cited
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Cited
US2288851A
Cited
US2736941A
Cited
US2698734A
Cited
US3076245A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |