US3347524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control device for drilling apparatus
Assignee: FIRST ASSET-BASED LENDING GROUP Inc C/O CONSOLIDATED ASSET MANAGEMENT COMPANY 120 NORTH ROBINSON OKLAHOMA CITY OK 73192
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Filing: 1959-03-30
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Granted: 1967-10-17
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Expires: 1979-03-30
Abstract
No abstract record available.
Inventors
- 👤 James O Melton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:23
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/084
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
177 words
IN A DRILLING RIG INCLUDING A FRAME, AN UPPER PULLEY BLOCK SECURED TO SAID FRAME, A LOWER MOVABLE PULLEY BLOCK, UPPER AND LOWER PULLEYS ROTATABLY MOUNTED WITHIN SAID PULLEY BLOCKS, RESPECTIVELY, A DRILL STRING SUPPORTED FROM SAID LOWER BLOCK, A ROTATABLE CABLE DRUM, A CABLE WOUND ON SAID CABLE DRUM PASSING AROUND SAID PULLEYS OF SAID PULLEY BLOCKS AND SECURED AT ONE END OF SAID FRAME WHEREBY THE UNWINDING OF SAID CABLE DRUM WILL CAUSE SAID DRILL STRING TO DESCEND, AND A BRAKE MEANS NORMALLY BEARING AGAINST SAID CABLE DRUM SO AS TO PREVENT ROTATION OF THE SAME, THE IMPROVEMENT WHICH COMPRISES AN AUTOMATIC CONTROL SYSTEM INCLUDING A WEIGHT SENSING DEVICE CONTAINING FLUID THEREIN AND HAVING A SENSING ELEMENT BEARING AGAINST SAID CABLE, SAID SENSING ELEMENT BEING MOVABLE IN RESPONSE TO THE CHANGES IN TENSION IN SAID CABLE FOR PRODUCING IN SAID SENSING DEVICE A FLUID PRESSURE IN SAID FLUID PROPORTIONAL TO THE TENSION IN SAID CABLE, A FLUID-PRESSURE RESPONSIVE ACTUATOR ATTACHED TO SAID BRAKE MEANS AND ADAPTED UPON ENERGIZATION TO RELEASE SAID BRAKE MEANS, A CONTROLLER
Claim 2
Dependent Claim
177 words
IN A DRILLING RIG INCLUDING A FRAME, AN UPPER PULLEY BLOCK SECURED TO SAID FRAME, A LOWER MOVABLE PULLEY BLOCK, UPPER AND LOWER PULLEYS ROTATABLY MOUNTED WITHIN SAID PULLEY BLOCKS, RESPECTIVELY, A DRILL STRING SUPPORTED FROM SAID LOWER BLOCK, A ROTATABLE CABLE DRUM, A CABLE WOUND ON SAID CABLE DRUM PASSING AROUND SAID PULLEYS OF SAID PULLEY BLOCKS AND SECURED AT ONE END OF SAID FRAME WHEREBY THE UNWINDING OF SAID CABLE DRUM WILL CAUSE SAID DRILL STRING TO DESCEND, AND A BRAKE MEANS NORMALLY BEARING AGAINST SAID CABLE DRUM SO AS TO PREVENT ROTATION OF THE SAME, THE IMPROVEMENT WHICH COMPRISES AN AUTOMATIC CONTROL SYSTEM INCLUDING A WEIGHT SENSING DEVICE CONTAINING FLUID THEREIN AND HAVING A SENSING ELEMENT BEARING AGAINST SAID CABLE, SAID SENSING ELEMENT BEING MOVABLE IN RESPONSE TO THE CHANGES IN TENSION IN SAID CABLE FOR PRODUCING IN SAID SENSING DEVICE A FLUID PRESSURE IN SAID FLUID PROPORTIONAL TO THE TENSION IN SAID CABLE, A FLUID-PRESSURE RESPONSIVE ACTUATOR ATTACHED TO SAID BRAKE MEANS AND ADAPTED UPON ENERGIZATION TO RELEASE SAID BRAKE MEANS, A CONTROLLER
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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) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |