Patent US4217849A successfully refreshed from Google Patents.
US4217849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mine roof warning indicator
Assignee: Individual
•
Filing: 1978-12-21
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Granted: 1980-08-19
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Expires: 1998-12-21
Abstract
Abstract A mine warning device which comprises tensioned arms that abut the roof of an underground mine. The arms support a cone shaped shaft which is attached to a warning indicator. The indicator remains invisible within the body of the device when the rocks forming the roof are stable. Upon a shifting of the mine roof, which applies pressure to the arms of the device, the shaft is released and the warning cylinder falls into view. Preferably, the device attaches to bolts that hold plates to the mine roof and the warning indicator is fluorescent.
Inventors
- 👤 Larry L. Brown
- 👤 Robert G. Hamm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:42
CPC Classifications
E; E21; E21F; E21F17/00; E21F17/18; E21F17/185; F; F16; F16B; F16B31/00; F16B31/02; G; G01; G01L; G01L5/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
69 words
An underground mine warning device comprising a means for mounting the device upon an attaching meaning contained on the roof of a mine; outwardly extending compressioned arm means for detecting movement of a mine roof which are in communication with said mine roof; activation means for displaying an indicator means upon movement of said compressioned arm means; and on indicator means which indicate movement of said compressioned arm means.
Claim 2
Dependent Claim
69 words
An underground mine warning device comprising a means for mounting the device upon an attaching meaning contained on the roof of a mine; outwardly extending compressioned arm means for detecting movement of a mine roof which are in communication with said mine roof; activation means for displaying an indicator means upon movement of said compressioned arm means; and on indicator means which indicate movement of said compressioned arm means.
Claim 3
Dependent Claim
19 words
The device of claim 1 wherein said device communicates to the mine roof through at least one flat plate.
Claim 4
Dependent Claim
54 words
The device of claim 1 wherein said means for mounting the device upon an attaching means contained on the roof of a mine comprises an aperture within the body of the device which is shaped to mate with a bolt head and at least two screws for maintaining a bolt head within said aperture.
Claim 5
Dependent Claim
18 words
The device of claim 1 wherein said compressioned arm means comprises at least two arm and spring sets.
Claim 6
Dependent Claim
13 words
The device of claim 4 wherein said arms comprise at least two fingers.
Claim 7
Dependent Claim
10 words
The device of claim 5 wherein said fingers are adjustable.
Claim 8
Dependent Claim
14 words
The device of claim 4 wherein said springs are at least four pound springs.
Claim 9
Dependent Claim
35 words
The device of claim 4 wherein the ends of said arms form a circle within the device and when no pressure is applied to said arms they support a shaft bearing a cone shaped head.
Claim 10
Dependent Claim
17 words
The device of claim 1 wherein said activation means comprises a shaft bearing a cone shaped head.
Claim 11
Dependent Claim
12 words
The device of claim 9 wherein said shaft is within a spring.
Claim 12
Dependent Claim
16 words
The device of claim 10 wherein said shaft and spring is attached to said indicator means.
Claim 13
Dependent Claim
13 words
The device of claim 1 wherein said indicator means comprises a fluorescent cylinder.
Claim 14
Dependent Claim
76 words
An underground mine warning device comprising a bolt inserted within the mine roof; an aperture within the body of the device which is shaped to mate with said bolt and at least two screws for maintaining the bolt within the aperture; outwardly extending compressioned arm means for detecting movement of the mine roof which are in communication with said mine roof; and activation means for displaying a fluorescent cyclinder upon movement of said compressioned arm means.
Claim 15
Dependent Claim
76 words
An underground mine warning device comprising a bolt inserted within the mine roof; an aperture within the body of the device which is shaped to mate with said bolt and at least two screws for maintaining the bolt within the aperture; outwardly extending compressioned arm means for detecting movement of the mine roof which are in communication with said mine roof; and activation means for displaying a fluorescent cyclinder upon movement of said compressioned arm means.
References Cited (Backward Citations)
US2362872A
Cited
US2725843A
Cited
US3111655A
Cited
US3133468A
Cited
US3179082A
Cited
US3137268A
Cited
US3329058A
Cited
GB1213734A
Cited
US3786503A
Cited
US3844248A
Cited
US4000681A
Cited
US4041776A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-19 | 1984-02-18 | 1984-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-19 | 1988-02-18 | 1988-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-19 | 1992-02-18 | 1992-08-19 | $7700.00 | Window Closed / Lapsed |