Patent US3307880A successfully refreshed from Google Patents.
US3307880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutter bit mounting for ripper type miner
Assignee: Westinghouse Air Brake Co
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Filing: 1963-11-22
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Granted: 1967-03-07
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Expires: 1983-11-22
Abstract
No abstract record available.
Inventors
- 👤 John S Newton
- 👤 James M Kemper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:16
CPC Classifications
E; E21; E21C; E21C25/00; E21C25/06; E21C25/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
IN A CONTINUOUS MINING MACHINE, A ROTARY CUTTER DRUM SUPPORTED FOR ROTATION ABOUT A HORIZONTAL AXIS EXTENDING PARALLEL TO A FACE TO BE MINED AND MOVED VERTICALLY ALONG THE FACE, TO MINE OUT A WORKING PLACE, A SERIES OF CUTTER SUPPORT RINGS STACKED ALONG THE EXTERIOR OF SAID DRUM AND SECURED THERETO FOR ROTATION THEREWITH AND HAVING CLUSTERS OF CUTTER BITS EXTENDING OUTWARDLY THEREFROM, CERTAIN OF WHICH BITS ARE PITCHED AT ANGLES TO CUT CLEARANCE FOR SAID RINGS, SAID CLUSTERS OF CUTTER BITS ON EACH RING BEING CIRCUMFERENTIALLY MISALIGNED WITH RESPECT TO A PLANE EXTENDING PERPENDICULAR TO THE AXIS OF ROTATION OF THE DRUM AND INTERSECTING THE PERIPHERY OF THE RING AND THE CLUSTERS OF CUTTER BITS ON ADJACENT RINGS BEING OUT OF AXIAL ALIGNMENT WITH RESPECT TO EACH OTHER.
Claim 2
Dependent Claim
130 words
IN A CONTINUOUS MINING MACHINE, A ROTARY CUTTER DRUM SUPPORTED FOR ROTATION ABOUT A HORIZONTAL AXIS EXTENDING PARALLEL TO A FACE TO BE MINED AND MOVED VERTICALLY ALONG THE FACE, TO MINE OUT A WORKING PLACE, A SERIES OF CUTTER SUPPORT RINGS STACKED ALONG THE EXTERIOR OF SAID DRUM AND SECURED THERETO FOR ROTATION THEREWITH AND HAVING CLUSTERS OF CUTTER BITS EXTENDING OUTWARDLY THEREFROM, CERTAIN OF WHICH BITS ARE PITCHED AT ANGLES TO CUT CLEARANCE FOR SAID RINGS, SAID CLUSTERS OF CUTTER BITS ON EACH RING BEING CIRCUMFERENTIALLY MISALIGNED WITH RESPECT TO A PLANE EXTENDING PERPENDICULAR TO THE AXIS OF ROTATION OF THE DRUM AND INTERSECTING THE PERIPHERY OF THE RING AND THE CLUSTERS OF CUTTER BITS ON ADJACENT RINGS BEING OUT OF AXIAL ALIGNMENT WITH RESPECT TO EACH OTHER.
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) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |