Mine roof bolt assembly
Abstract
Abstract A MINE ROOF BOLT ASSEMBLY INCLUDING A ROOF BOLT HAVING A HEAD AT ONE END AND THREADED AT THE OTHER END, A WEDGE MEMBER HAVING TAPERING WALLS THREADELY ENGAGED WITH THE ROOF BOLT, AND AN EXPANSION SHELL POSITIONED OVER THE WEDGE MEMBER AND ACTUATED THEREBY, THE EXPANSION SHELL INCLUDING A PAIR OF EARS CONNECTED BY A BALE, THE INNER SURFACE OF THE EARS BEING ENGAGEABLE WITH THE WEDGE MEMBER AND EXPANDED THEREBY UPON PASSAGE OF THE WEDGE MEMBER THROUGH THE SHELL. THE OUTER SURFACE OF THE SHELL IS PROVIDED WITH A SERIES OF RIBS WHICH ARE ANGULARLY DIS- POSED TRANSVERSELY OF EACH EAR, FOR EFFECTING "THREADING" OF THE SHELL INTO ROCK SURROUNGING THE HOLE INTO WHICH THE ASSEMBLY IS PLACED. THE WEDGE MEMBER IS PROVIDED WITH AN ALIGNMENT NOTCH NEAR THE UPPER LIMIT THEREOF, FOR ENGAGEMENT WITH THE BALE OF THE SHELL, AND THE LOWER END IS PROVIDED WITH ALIGNMENT LUGS ENGAGEABLE WITH THE INNER SURFACE OF THE SHELL, THE ALIGMENT NOTCH AND LUGS PREVENTING LATERAL MISALLIGNMENT OF THE EARS AND WEDGE.
Inventors
- 👤 Richard H Warner
Bibliographic Details
Claims Analysis
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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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |