US3910360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for collecting and separating dust during air-flushed rock drilling using a vibrating filter
Assignee: Atlas Copco AB
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Filing: 1973-07-11
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Granted: 1975-10-07
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Expires: 1993-07-11
Abstract
Abstract A dust collecting device, intended for use at air-flushed rock drilling, is cleaned and discharged in that its air-flowestablishing air ejector is shut off and in that its fabric filter unit is vibrated, whereafter the device is opened and collected dust is removed. A control system for remote control prevents automatically the filter unit from being vibrated during suction of dust, said control system being connected to the flush air conduit of the rock drill for making the operation of the dust collecting device responsive to the position of the flush air throttle valve. The control system also comprises a timing unit for determining of the time interval during which the filter unit is exposed to vibrations.
Inventors
- 👤 Nils Goran Sundstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:57
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/06; E21B21/07
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
135 words
Method for collecting and separating dust at air-flushed rock drilling by means of a dust collecting device having a vibratorcleaned filter unit, comprising the steps of: selectively supplying flush air to the rock drill; circulating dust carrying air through the filter unit as the flush air is supplied to the rock drill; sensing the pressure within the flush air supply conduit and determining when the sensed pressure falls below a predetermined value; discontinuing the air circulation through the filter unit as the flush air supply to the rock drill is shut off responsive to said pressure within the flush air supply conduit falling below said predetermined value; and vibrating the filter unit only when the air circulation therethrough is discontinued responsive to said pressure within the flush air supply conduit falling below said predetermined value.
Claim 2
Dependent Claim
135 words
Method for collecting and separating dust at air-flushed rock drilling by means of a dust collecting device having a vibratorcleaned filter unit, comprising the steps of: selectively supplying flush air to the rock drill; circulating dust carrying air through the filter unit as the flush air is supplied to the rock drill; sensing the pressure within the flush air supply conduit and determining when the sensed pressure falls below a predetermined value; discontinuing the air circulation through the filter unit as the flush air supply to the rock drill is shut off responsive to said pressure within the flush air supply conduit falling below said predetermined value; and vibrating the filter unit only when the air circulation therethrough is discontinued responsive to said pressure within the flush air supply conduit falling below said predetermined value.
Claim 3
Dependent Claim
26 words
Method according to claim 1 comprising shutting off said air circulation and starting said vibration responsive to the flush air supply conduit being relieved of pressure.
Claim 4
Dependent Claim
123 words
Dust collecting device for use in air-flushed rock drilling with a rock drill having a flush air supply conduit, comprising: a housing; a flush air supply conduit of the rock drill; a fabric filter unit located within said housing; vibrator means arranged to impart vibrations to said filter unit for cleaning said filter unit; an air flow effecting means for establishing a dust transporting air flow through said housing; and control means coupled to said flush air supply conduit and to said vibrator means for sensing the pressure in said flush air supply conduit and for automatically activating said vibrator means and shutting off said air flow effecting means when the pressure within said flush air supply conduit falls below a predetermined value.
Claim 5
Dependent Claim
123 words
Dust collecting device for use in air-flushed rock drilling with a rock drill having a flush air supply conduit, comprising: a housing; a flush air supply conduit of the rock drill; a fabric filter unit located within said housing; vibrator means arranged to impart vibrations to said filter unit for cleaning said filter unit; an air flow effecting means for establishing a dust transporting air flow through said housing; and control means coupled to said flush air supply conduit and to said vibrator means for sensing the pressure in said flush air supply conduit and for automatically activating said vibrator means and shutting off said air flow effecting means when the pressure within said flush air supply conduit falls below a predetermined value.
Claim 6
Dependent Claim
32 words
Device according to claim 3 wherein said control means activates said vibrator means and shuts off said air flow effecting means responsive to the flush air supply conduit being relieved of pressure.
Claim 7
Dependent Claim
18 words
Device according to claim 3 wherein said air flow effecting means is located down-stream of said filter unit.
Claim 8
Dependent Claim
24 words
Device according to claim 3 wherein said control means comprises a timing unit for activating said vibrator means for a limited, predetermined time interval.
Claim 9
Dependent Claim
67 words
Device according to claim 5 wherein said timing unit comprises a pressure air accumulator which is connected to the pressure air source when said air flow effecting means is active and which is discharged through a flow restricting means when said air flow effecting means is non-active, whereby said control means is biased towards its vibrator-activating position as long as said accumulator pressure exceeds a certain value.
Claim 10
Dependent Claim
42 words
Device according to claim 3 wherein said the filter unit includes a number of vertically arranged fabric hoses which are closed and which are attached to a common mounting frame at their upper ends, said mounting frame also carrying said vibrator means.
Claim 11
Dependent Claim
33 words
Device according to claim 8 comprising an additional vibrator means, and wherein saId hoses are connected to a common socket frame at their lower ends, said socket frame carrying said additional vibrator means.
Claim 12
Dependent Claim
15 words
Device according to claim 3 wherein said air flow effecting means comprises an air ejector.
Claim 13
Dependent Claim
16 words
Device according to claim 10 wherein said air ejector is located down-stream of said filter unit.
Claim 14
Dependent Claim
64 words
Device according to claim 3 wherein said control means includes a three-position controller, wherein in a first position said vibrator means and said air flow effecting means are inactive, in a second position said vibrator means is active and said air flow effecting means is inactive, and in a third position said vibrator means is inactive and said air flow effecting means is active.
Claim 15
Dependent Claim
37 words
Device according to claim 12 wherein said control means includes at least one multi-position valve coupled to a pressure air source and which selectively coupled pressure air to said vibrator means and said air flow effecting means.
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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) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |