Patent US3811660A successfully refreshed from Google Patents.
US3811660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Equipment for making foam for dust suppression and other purposes
Assignee: Individual
•
Filing: 1973-03-30
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Granted: 1974-05-21
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Expires: 1993-03-30
Abstract
Abstract This system generates foam which is discharged into broken masses of coal or other dusty products at the locations where the coal is broken loose from a mine vein, or at conveyor or other transfer points for any dusty material. Nozzles discharge the foam under conditions that cause the foam to penetrate the dusty mass of material. The amount of foam required is regulated automatically by the weight of the coal or other material. The system also functions as a fire suppression system which can be automatic with fire detector means located at places to be protected. The foam generator maintains a constant ratio of air to water, but the apparatus is adjustable to change the ratio when desired.
Inventors
- 👤 H Cole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:16
CPC Classifications
E; E21; E21F; E21F5/00; E21F5/02; E21F5/06; Y; Y10; Y10S; Y10S261/00; Y10S261/26
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
127 words
In a foam generating system, lines for supplying air, water, and foaming agent under pressure to a foamer as the ingredients for making foam, a source of compressed air, a positive displacement metering device in the supply line for the compressed air and through which the air is passed under pressure on its way to the foamer, another positive displacement device, in the supply line of one of the other ingredients for metering said other ingredient through its supply line to the foamer, motion transmitting means for driving both of said positive displacement metering devices, means for regulating the pressure of the air sup-plied to the air metering device, and a feedback sensing the conditions where the foam is mixed for controlling said air pressure regulating means.
Claim 2
Dependent Claim
127 words
In a foam generating system, lines for supplying air, water, and foaming agent under pressure to a foamer as the ingredients for making foam, a source of compressed air, a positive displacement metering device in the supply line for the compressed air and through which the air is passed under pressure on its way to the foamer, another positive displacement device, in the supply line of one of the other ingredients for metering said other ingredient through its supply line to the foamer, motion transmitting means for driving both of said positive displacement metering devices, means for regulating the pressure of the air sup-plied to the air metering device, and a feedback sensing the conditions where the foam is mixed for controlling said air pressure regulating means.
Claim 3
Dependent Claim
43 words
The foam generating system described in claim 1 characterized by the air pressure regulator having a pressure sensing chamber, and the feedback connecting the pressure sensing chamber of the air pressure regulator with a region of the system where the ingredients are mixed.
Claim 4
Dependent Claim
86 words
The foam generating system described in claim 1 characterized by the source of compressed air being connected by said air supply line to the air metering device, a second metering device comprising a pump, the air metering device being a motor connected by said motion transmitting means to said pump, and a connection between the foaming agent supply line and the motor through which foaming agent flows through the motor to seal clearances in the air motor whereby the air motor operates with higher volumetric efficiency.
Claim 5
Dependent Claim
40 words
The system described in claim 3 characterized by the pump being in the foaming agent supply line in position to discharge foaming agent into the air supply line upstream of the air motor that is in the air supply line.
Claim 6
Dependent Claim
48 words
The system described in claim 1 characterized by a third metering device comprising a pump in the water supply line which is separate from the foaming agent supply line, the motion transmitting means driving the pump in the water supply line and the other metering devices in unison.
Claim 7
Dependent Claim
47 words
The system described in claim 1 characterized by the motion transmitting means includinG a variable ratio drive that is adjustable to change the ratio of air metered by the air metering action of the motor and the amount of water delivered to the foamer by the pump.
Claim 8
Dependent Claim
95 words
The system described in claim 1 characterized by a plurality of foamers, a common header to which the ingredients are supplied to the foamers, means for regulating the flow of each of the ingredients with respect to the other ingredient so as to maintain substantially constant ratios of the ingredients with variations of the demand for foam, said means for regulating the flow of ingredients being adjustable to change the ratio of ingredients that is to be maintained, and said means including compressed air bottles from which air is delivered to the air pressure regulator.
Claim 9
Dependent Claim
33 words
The system described in claim 1 characterized by an air compressor that supplies air to the air metering device, and a motor that drives the air compressor when the system is in operation.
Claim 10
Dependent Claim
36 words
The system described in claim 8 characterized by the means for regulating the pressure of the air supplied to the air metering device being a modulator that controls the amount of air that enters the compressor.
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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) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |