US4394975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rock dust blower
Assignee: CAB AND Co CRAB ORCHARD WV
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Filing: 1981-07-02
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Granted: 1983-07-26
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Expires: 2001-07-02
Abstract
Abstract A portable rock dust blowing apparatus comprising a wheel or skid supported framework upon which is mounted a blower designed to derive it's driving power from a belt engaging roller which is also supported on the framework. Also mounted on the framework is a pair of inverted U-shaped channel members which are employed for adjusting the framework relative to an endless belt travelling under the framework. A hopper for containing a rock dust or the like is used along with the aforesaid apparatus whereby the blower assembly will be employed for directing the rock dust on to the walls, ceiling and floor of a mine tunnel or shaft by one utilizing the rock dust blower of the present invention.
Inventors
- 👤 Clyde A. Bare, Jr.
- 👤 Buddy L. Bare
- 👤 Walter A. Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:48
CPC Classifications
E; E21; E21F; E21F5/00; E21F5/08; E21F5/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
143 words
A rock dust applying device comprising a framework having mounted thereon a roller adapted to engage with the undersurface of a travelling endless conveyor and to be rotated thereby, a gear train rotated by said roller, a blower mounted on said framework and being driven by said gear train, said blower directing a stream of air through a conduit which directs some of the air through a hopper to thereby agitate a rock dust contained therein which is to be sprayed on to the surface of a mine tunnel or shaft, said blower also directing a stream of air through a conduit extending below said hopper to aspirate some of the dust from within said hopper and to direct the rock dust laden air to a nozzle for spraying the surface of a mine shaft or tunnel with said rock dust laden air.
Claim 2
Dependent Claim
143 words
A rock dust applying device comprising a framework having mounted thereon a roller adapted to engage with the undersurface of a travelling endless conveyor and to be rotated thereby, a gear train rotated by said roller, a blower mounted on said framework and being driven by said gear train, said blower directing a stream of air through a conduit which directs some of the air through a hopper to thereby agitate a rock dust contained therein which is to be sprayed on to the surface of a mine tunnel or shaft, said blower also directing a stream of air through a conduit extending below said hopper to aspirate some of the dust from within said hopper and to direct the rock dust laden air to a nozzle for spraying the surface of a mine shaft or tunnel with said rock dust laden air.
Claim 3
Dependent Claim
41 words
The structure recited in claim 1 wherein said framework is supported on a pair of cable members and wherein said framework may be elevated or lowered to thus increase or decrease the frictional contact of said roller with said travelling conveyor.
Claim 4
Dependent Claim
32 words
The structure recited in claim 1 wherein said rock dust applying device is suspended off the floor of the mine during operation thereof by means of cables and mine roof anchored rods.
Claim 5
Dependent Claim
12 words
The structure recited in claim 1 wherein said roller is rubber covered.
References Cited (Backward Citations)
US3415450A
Cited
US4109861A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-25 | 1987-01-24 | 1987-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-25 | 1991-01-24 | 1991-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-25 | 1995-01-24 | 1995-07-26 | $7700.00 | Window Closed / Lapsed |