Patent US4293243A successfully refreshed from Google Patents.
US4293243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mine roof bolt assembly guard
Assignee: Individual
•
Filing: 1979-02-14
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Granted: 1981-10-06
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Expires: 1999-02-14
Abstract
Abstract A guard for a mine roof bolt assembly is disclosed. The guard consists of a cap having a cavity into which the mine roof bolt head is inserted. The cavity wall includes serrations which grip the bolt head and secure the guard on it. A continuous annular skirt depends from the cap and extends outward to completely cover the bolt plate. The skirt curves in the radial direction towards the plate so that the guard presents a substantially smooth curved surface to a passing miner. The skirt includes cut-outs corresponding to the positions of hanger loops on the bolt plate. The guards may also include luminescent or colored material.
Inventors
- 👤 Carl N. Graybeal
- 👤 Basil E. Rogers
- 👤 Joseph V. Cox
- 👤 Roy R. Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:06
CPC Classifications
A; A47; A47G; A47G3/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
155 words
In combination with a mine roof bolt assembly comprising a mine roof bolt having a head and a mine roof bolt plate adapted to fit around said bolt, a guard comprising: a cap adapted to fit over the head of said bolt, said cap including an upper surface, a lower surface and a cavity in said upper surface into which said mine roof bolt head may be inserted; fixing means associated with said cavity for removably fixing said cap to said bolt head; and an annular skirt, depending from said cap and extending outward from adjacent said lower surface for a distance at least sufficient to completely cover said bolt plate, said skirt gradually curving towards said bolt plate; wherein said mine roof bolt assembly includes hanger loops and said skirt includes cut-outs in positions corresponding to said loops; wherein said guard presents a substantially continuous surface, having a curved periphery, to a passing miner.
Claim 2
Dependent Claim
155 words
In combination with a mine roof bolt assembly comprising a mine roof bolt having a head and a mine roof bolt plate adapted to fit around said bolt, a guard comprising: a cap adapted to fit over the head of said bolt, said cap including an upper surface, a lower surface and a cavity in said upper surface into which said mine roof bolt head may be inserted; fixing means associated with said cavity for removably fixing said cap to said bolt head; and an annular skirt, depending from said cap and extending outward from adjacent said lower surface for a distance at least sufficient to completely cover said bolt plate, said skirt gradually curving towards said bolt plate; wherein said mine roof bolt assembly includes hanger loops and said skirt includes cut-outs in positions corresponding to said loops; wherein said guard presents a substantially continuous surface, having a curved periphery, to a passing miner.
Claim 3
Dependent Claim
11 words
The apparatus of claim 1 wherein said guard includes luminescent material.
Claim 4
Dependent Claim
28 words
The apparatus of claim 1 wherein said guard includes material of a specific color, the color of all said guards in a given mine tunnel being the same.
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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) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |