Patent US3228199A successfully refreshed from Google Patents.
US3228199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mining apparatus
Assignee: Dowty Mining Equipment Ltd
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Filing: 1963-05-23
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Granted: 1966-01-11
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Expires: 1983-05-23
Abstract
No abstract record available.
Inventors
- 👤 Potts Michael Charles
- 👤 Bolton Douglas Herbert Hewlett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:24
CPC Classifications
E; E21; E21D; E21D23/00; E21D23/16; E21D23/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
280 words
MINING APPARATUS INCLUDING A CUTTING MACHINE AND A GUIDE MEANS EXTENDING ALONG THE WORKING FACE OF A MINE, AND GUIDING SAID CUTTING MACHINE AS IT TRAVERSES THE WORKING FACE, A PRESSURE-FLUID SUPPLY DUCT EXTENDING ALONG THE WORKING FACE, AND A SERIES OF ROOF SUPPORTS ARRANGED ALONG THE WORKING FACE, EACH OF ROOF SUPPORT INCLUDING FLUIDPRESSURE-OPERATED PROP MEANS ARRANGED IN USE TO SUPPORT THE ROOF, A FLUID-PRESSURE-OPERATED JACK CONNECTING EACH ROOF SUPPORT TO SAID GUIDE MEANS TO ADVANCE THE ROOF SUPPORT BY REACTION FROM THE GUIDE MEANS, AND CERTAIN OF SAID ROOF SUPPORTS INCLUDING A FLUID-PRESSURE-OPERATED JACK ARRANGED, WHEN IN USE, TO URGE THE GUIDE MEANS AND THE CUTTING MACHINE AGAINST THE WORKING FACE BY REACTION FROM SAID CERTAIN ROOF SUPPORTS, A CONTROL VALVE ASSEMBLY INCLUDED IN EACH ROOF SUPPORT, ARRANGED TO CONTROL THE SUPPLY OF FLUID UNDER PRESSURE FROM SAID SUPPLY DUCT TO THE CORRESPONDING PROP MEANS, AND TO THE CORRESPONDING JACK FOR ADVANCING THE GUIDE MEANS, IF ONE BE INCLUDED IN SUCH ROOF SUPPORT, AND TO THE CORRESPONDING SUPPORTADVANCING JACK, TO CAUSE ITS ROOF SUPPORT TO UNDERGO AN ADVANCING OPERATION, TRIGGERING MEANS RESPONSIVE TO ADVANCE OF THE GUIDE MEANS BY A PREDETERMINED AMOUNT RELATIVE TO THE FIRST ROOF SUPPORT IN THE SERIES AND OPERATIVELY CONNECTED TO THE CONTROL VALVE ASSEMBLY OF SAID FIRST ROOF SUPPORT TO CAUSE OPERATION OF THAT CONTROL VALVE ASSEMBLY IN A SUPPORT-ADVANCING MANNER, AND EACH CONTROL VALVE ASSEMBLY BEING OPERATIVELY CONNECTED TO THE CONTROL VALVE ASSEMBLY OF THE NEXT ROOF SUPPORT IN THE SERIES TO CAUSE OPERATION OF SUCH NEXT ROOF SUPPORT IN THE BLY IN A MANNER TO ADVANCE SUCH THAT ROOF SUPPORT, UPON COMPLETION OF THE ADVANCING OPERATION OF THE PRECEDING ROOF SUPPORT.
Claim 2
Dependent Claim
280 words
MINING APPARATUS INCLUDING A CUTTING MACHINE AND A GUIDE MEANS EXTENDING ALONG THE WORKING FACE OF A MINE, AND GUIDING SAID CUTTING MACHINE AS IT TRAVERSES THE WORKING FACE, A PRESSURE-FLUID SUPPLY DUCT EXTENDING ALONG THE WORKING FACE, AND A SERIES OF ROOF SUPPORTS ARRANGED ALONG THE WORKING FACE, EACH OF ROOF SUPPORT INCLUDING FLUIDPRESSURE-OPERATED PROP MEANS ARRANGED IN USE TO SUPPORT THE ROOF, A FLUID-PRESSURE-OPERATED JACK CONNECTING EACH ROOF SUPPORT TO SAID GUIDE MEANS TO ADVANCE THE ROOF SUPPORT BY REACTION FROM THE GUIDE MEANS, AND CERTAIN OF SAID ROOF SUPPORTS INCLUDING A FLUID-PRESSURE-OPERATED JACK ARRANGED, WHEN IN USE, TO URGE THE GUIDE MEANS AND THE CUTTING MACHINE AGAINST THE WORKING FACE BY REACTION FROM SAID CERTAIN ROOF SUPPORTS, A CONTROL VALVE ASSEMBLY INCLUDED IN EACH ROOF SUPPORT, ARRANGED TO CONTROL THE SUPPLY OF FLUID UNDER PRESSURE FROM SAID SUPPLY DUCT TO THE CORRESPONDING PROP MEANS, AND TO THE CORRESPONDING JACK FOR ADVANCING THE GUIDE MEANS, IF ONE BE INCLUDED IN SUCH ROOF SUPPORT, AND TO THE CORRESPONDING SUPPORTADVANCING JACK, TO CAUSE ITS ROOF SUPPORT TO UNDERGO AN ADVANCING OPERATION, TRIGGERING MEANS RESPONSIVE TO ADVANCE OF THE GUIDE MEANS BY A PREDETERMINED AMOUNT RELATIVE TO THE FIRST ROOF SUPPORT IN THE SERIES AND OPERATIVELY CONNECTED TO THE CONTROL VALVE ASSEMBLY OF SAID FIRST ROOF SUPPORT TO CAUSE OPERATION OF THAT CONTROL VALVE ASSEMBLY IN A SUPPORT-ADVANCING MANNER, AND EACH CONTROL VALVE ASSEMBLY BEING OPERATIVELY CONNECTED TO THE CONTROL VALVE ASSEMBLY OF THE NEXT ROOF SUPPORT IN THE SERIES TO CAUSE OPERATION OF SUCH NEXT ROOF SUPPORT IN THE BLY IN A MANNER TO ADVANCE SUCH THAT ROOF SUPPORT, UPON COMPLETION OF THE ADVANCING OPERATION OF THE PRECEDING ROOF SUPPORT.
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) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |