US3294449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for automatically controlling the steering of a mineral mining machine
Assignee: Coal Industry Patents Ltd
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Filing: 1962-08-06
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Granted: 1966-12-27
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Expires: 1982-08-06
Abstract
No abstract record available.
Inventors
- 👤 Hartley Dennis
- 👤 Cooper Laurence Reade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:37
CPC Classifications
E; E21; E21C; E21C35/00; E21C35/282; E21C35/302
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
200 words
APPARATUS FOR AUTOMATICALLY CONTROLLING THE STEERING OF A MINERAL MINING MACHINE COMPRISING AN EXTENSIBLE HYDRUALIC JACK CONNECTED WITH THE MACHINE AND CONTROLLING THE DIRECTION OF TRAVEL OF THE MACHINE IN A DIRECTION PERPENCICULAR TO THE PLANE OF A MINERAL SEAM, MEANS FOR PRODUCING A FIRST ELECTRICAL SIGNAL HAVING A CHARACTERSTIC DEPENDENT ON THE EXTENSION OF THE JACK, A SOURCE OF ELECTROMAGNETIC RADIATION MOUNTED ON THE MACHINE AND DIRECTING RADIATON INTO MATERIAL OF THE SAEM AT A LOCATION ADJACENT THE MACHINE, A RADITON DETECTION DEVICE CARRIED BY THE MACHINE, THE DEVICE BEING RESPONSIVE TO THE AMOUNT OF RADIATION BACK-SCATTERED BY SAID MATERIAL ADJACENT THE MACHINE AND PRODUCING A SECOND ELECRICAL SIGNAL HAVING A CHARACTERISTIC DEPENDENT ONTHE AMOUNT OF BACK-SCATTERED RADIATION RECEIVED BY THE DEVICE, AN ELECTRICAL DISCRIMINATING MEANS CONNECTED TO BE FED WITH BOTH SAID SIGNALS AND PRODUCING FROM THE AN OUTPUT SIGNAL HAVING A CHARACTERISTIC INDICATIVE OF THE STEERING CORRECTION REQUIRED TO RESTORE THE MACHINE TO A DESCRIBED DIRECTION OF TRAVEL IN THE MINERAL, AND AN ELECTRO-HYDRAULIC VALVE CONNECTED TO RECEIVE THE OUTPUT SIGNAL AND RESPONSIVE TO THE OUTPUT SIGNAL AND CONTROLLING THE SUPPLY OR EXHAUST OF HYDRAULIC FLUID TO OR FROM THE JACK TO EFFECT STEERING OF THE MACHINE.
Claim 2
Dependent Claim
200 words
APPARATUS FOR AUTOMATICALLY CONTROLLING THE STEERING OF A MINERAL MINING MACHINE COMPRISING AN EXTENSIBLE HYDRUALIC JACK CONNECTED WITH THE MACHINE AND CONTROLLING THE DIRECTION OF TRAVEL OF THE MACHINE IN A DIRECTION PERPENCICULAR TO THE PLANE OF A MINERAL SEAM, MEANS FOR PRODUCING A FIRST ELECTRICAL SIGNAL HAVING A CHARACTERSTIC DEPENDENT ON THE EXTENSION OF THE JACK, A SOURCE OF ELECTROMAGNETIC RADIATION MOUNTED ON THE MACHINE AND DIRECTING RADIATON INTO MATERIAL OF THE SAEM AT A LOCATION ADJACENT THE MACHINE, A RADITON DETECTION DEVICE CARRIED BY THE MACHINE, THE DEVICE BEING RESPONSIVE TO THE AMOUNT OF RADIATION BACK-SCATTERED BY SAID MATERIAL ADJACENT THE MACHINE AND PRODUCING A SECOND ELECRICAL SIGNAL HAVING A CHARACTERISTIC DEPENDENT ONTHE AMOUNT OF BACK-SCATTERED RADIATION RECEIVED BY THE DEVICE, AN ELECTRICAL DISCRIMINATING MEANS CONNECTED TO BE FED WITH BOTH SAID SIGNALS AND PRODUCING FROM THE AN OUTPUT SIGNAL HAVING A CHARACTERISTIC INDICATIVE OF THE STEERING CORRECTION REQUIRED TO RESTORE THE MACHINE TO A DESCRIBED DIRECTION OF TRAVEL IN THE MINERAL, AND AN ELECTRO-HYDRAULIC VALVE CONNECTED TO RECEIVE THE OUTPUT SIGNAL AND RESPONSIVE TO THE OUTPUT SIGNAL AND CONTROLLING THE SUPPLY OR EXHAUST OF HYDRAULIC FLUID TO OR FROM THE JACK TO EFFECT STEERING OF THE MACHINE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |