US4240754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asphaltic concrete patch mixing and heating apparatus and method
Assignee: Individual
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Filing: 1978-05-17
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Granted: 1980-12-23
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Expires: 1998-05-17
Abstract
Abstract An apparatus for heating and mixing an asphalt-aggregate composition comprises a drum rotatable about an axis, having a mixing and heating chamber with a restricted port at one end into which a flame and hot gases of combustion are directed and through which exhaust gases concurrently pass to atmosphere. A heating means comprises a burner for directing flame and the hot gases of combustion into the chamber at the restricted port along the drum axis of rotation and which burner is adjustable relative to the port along the drum axis of rotation. A burner assembly includes an air duct having an air entrainment port located away from substantial exposure to the drum exhaust gases. The drum includes a plurality of pegs extending into the drum chamber. Heating is carried out in a rotating drum without forming a veil or curtain of particulate composition through the hot gases of combustion.
Inventors
- 👤 Robert L. Mendenhall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:30
CPC Classifications
E; E01; E01C; E01C19/00; E01C19/02; E01C19/10; E01C19/1013; E01C19/1027; E01C19/1004; E01C2019/1081; E01C2019/109
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
79 words
A process for heating and mixing particles of a composition comprising asphalt and aggregate in a rotatable drum comprising placing the composition particles into the drum, introducing hot gases of combustion into said drum through a port, open to atmosphere, simultaneously rotating said drum at a speed to prevent formation of a veil or curtain of the particulate composition through said hot gases of combustion, and concurrently venting exhaust gases from said drum directly to atmosphere through said port.
Claim 2
Dependent Claim
79 words
A process for heating and mixing particles of a composition comprising asphalt and aggregate in a rotatable drum comprising placing the composition particles into the drum, introducing hot gases of combustion into said drum through a port, open to atmosphere, simultaneously rotating said drum at a speed to prevent formation of a veil or curtain of the particulate composition through said hot gases of combustion, and concurrently venting exhaust gases from said drum directly to atmosphere through said port.
Claim 3
Dependent Claim
26 words
The process of claim 1 wherein the drum is rotated at a speed up to about 250 feet per minute measured along the outside drum edge.
Claim 4
Dependent Claim
48 words
The process of claim 1 wherein said hot gases are directed into said rotating drum through the center of said port and along the axis of drum rotation, and said exhaust gases are vented directly to atmosphere between said hot gases and a peripheral edge of said port.
Claim 5
Dependent Claim
18 words
The process of claim 1 or 3 wherein the composition is introduced into said drum through said port.
Claim 6
Dependent Claim
18 words
The process of claims 1 or 3 wherein the composition is removed from said drum through said port.
Claim 7
Dependent Claim
35 words
The process of claims 1 or 3 wherein air supplied to a burner nozzle for said hot gases of combustion is drawn from atmosphere away from substantially concentrated exhaust gases being vented from said port.
Claim 8
Dependent Claim
28 words
The process of claims 1 or 3 wherein the temperature of gases in a half of the drum interior furthest from said port are at least 600° F.
Claim 9
Independent Claim
153 words
An apparatus for heating and mixing asphalt-aggregate composition comprising a drum rotatable about an axis, a first port at a first end of said drum through which hot gases of combustion are directed, said first port being restricted relative to the drum interior, open to atmosphere, and where the axis of drum rotation extends through said first port, a second port having closure means cooperating therewith for selectively opening and closing said port and located at a second end of said drum opposite said first end, a burner member located adjacent said first port for introducing hot gases of combustion into said drum through said first port, and wherein the drum has an interior heating and mixing chamber surface having a plurality of elongated pegs extending into the chamber, said pegs being of at least two different lengths with the shorter pegs located in a portion of the drum nearest the first port.
Claim 10
Independent Claim
153 words
An apparatus for heating and mixing asphalt-aggregate composition comprising a drum rotatable about an axis, a first port at a first end of said drum through which hot gases of combustion are directed, said first port being restricted relative to the drum interior, open to atmosphere, and where the axis of drum rotation extends through said first port, a second port having closure means cooperating therewith for selectively opening and closing said port and located at a second end of said drum opposite said first end, a burner member located adjacent said first port for introducing hot gases of combustion into said drum through said first port, and wherein the drum has an interior heating and mixing chamber surface having a plurality of elongated pegs extending into the chamber, said pegs being of at least two different lengths with the shorter pegs located in a portion of the drum nearest the first port.
Claim 11
Dependent Claim
73 words
Apparatus of claim 8 wherein said burner member includes a nozzle for directing flame and hot gases of combustion into said drum port and an air duct for directing air to said nozzle, and having an air entrainment port located at a distance from said nozzle and from said port to prevent substantial amounts of exhaust gases vented from said first port of said drum from being drawn into said air entrainment port.
Claim 12
Dependent Claim
20 words
Apparatus of claim 8 wherein the pegs are aligned in rows extending substantially parallel with the axis of drum rotation.
Claim 13
Dependent Claim
16 words
Apparatus of claim 8 wherein said pegs are between about 1/2 and about 4 inches long.
Claim 14
Dependent Claim
17 words
Apparatus of claim 11 wherein said pegs are spaced apart between about 2 and about 10 inches.
Claim 15
Independent Claim
84 words
An apparatus for heating and mixing asphalt-aggregate composition comprising a rotatable drum having a port, open to atmosphere, for introducing the composition, a burner adjacent said port for directing flame and hot gases of combustion therein, an interior mixing chamber in which the surfce of said chamber has a plurality of elongated protuberances extending into said chamber and wherein said protuberances comprise elongated pegs of at least two different lengths the shorter pegs being located along a portion of the drum, nearest said port.
Claim 16
Independent Claim
84 words
An apparatus for heating and mixing asphalt-aggregate composition comprising a rotatable drum having a port, open to atmosphere, for introducing the composition, a burner adjacent said port for directing flame and hot gases of combustion therein, an interior mixing chamber in which the surfce of said chamber has a plurality of elongated protuberances extending into said chamber and wherein said protuberances comprise elongated pegs of at least two different lengths the shorter pegs being located along a portion of the drum, nearest said port.
Claim 17
Dependent Claim
20 words
Apparatus of claim 13 wherein the pegs are aligned in rows extending substantially parallel with the axis of drum rotation.
Claim 18
Dependent Claim
16 words
Apparatus of claim 13 wherein said pegs are between about 1/2 and about 4 inches long.
Claim 19
Dependent Claim
17 words
Apparatus of claim 15 wherein said pegs are spaced apart between about 2 and about 10 inches.
Claim 20
Independent Claim
140 words
An apparatus for heating and mixing asphalt-aggregate composition comprising a drum rotatable about an axis, a first port at a first end of said drum through which hot gases of combustion are directed, said first port being restricted relative to the drum interior, open to atmosphere, and where the axis of drum rotation extends through said first port, a second port having closure means cooperating therewith for selectively opening and closing said port and located at a second end of said drum opposite said first end, a burner member located adjacent said first port for introducing hot gases of combustion into said drum through said first port, and a hopper for introducing composition into the second end of said drum, said hopper having a plate comprising a plurality of segments for varying the rate of composition fed to said drum.
Claim 21
Independent Claim
140 words
An apparatus for heating and mixing asphalt-aggregate composition comprising a drum rotatable about an axis, a first port at a first end of said drum through which hot gases of combustion are directed, said first port being restricted relative to the drum interior, open to atmosphere, and where the axis of drum rotation extends through said first port, a second port having closure means cooperating therewith for selectively opening and closing said port and located at a second end of said drum opposite said first end, a burner member located adjacent said first port for introducing hot gases of combustion into said drum through said first port, and a hopper for introducing composition into the second end of said drum, said hopper having a plate comprising a plurality of segments for varying the rate of composition fed to said drum.
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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) | 1983-12-23 | 1984-06-23 | 1984-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-23 | 1988-06-23 | 1988-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-23 | 1992-06-23 | 1992-12-23 | $7700.00 | Window Closed / Lapsed |