US3740820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of repairing damaged holes in a boiler drum
Assignee: Individual
•
Filing: 1971-01-28
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Granted: 1973-06-26
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Expires: 1991-01-28
Abstract
Abstract Apparatus and methods for repairing or producing openings in a boiler drum is provided. Weld material is applied to the drum in the area of the openings to reduce substantially the size of the openings. A precisely aligned drill within the drum is then radially and longitudinally moved in steps is inserted within the drum and to produce or redimension openings within the drum.
Inventors
- 👤 R Tarves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:20
CPC Classifications
B; B23; B23P; B23P6/00; B23P6/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49352; Y10T29/49718; Y10T29/49732; Y10T29/49734; Y10T29/49746; Y10T29/4998
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
155 words
A method of repairing a cylindrical drum including a plurality of holes therein extending along a line longitudinally along said drum, said holes having become enlarged or elongated as a result of corrosion, overheating or the like, said method comprising the steps of adding a weld material to said drum in the area of said holes to reduce substantially the size of said holes and thus provide smaller holes, providing an assembly including a movably mounted tool with a cutter element larger in dimension than said smaller holes with said tool being movable longiTudinally on said assembly, fixedly mounting said assembly inside of said drum in a predetermined position, moving said tool sequentially in steps with said assembly in place longitudinally within said drum to positions in alignment with said smaller holes, and machining away part of said weld material to produce a set of longitudinal holes corresponding to the dimensions of said cutter element.
Claim 2
Independent Claim
155 words
A method of repairing a cylindrical drum including a plurality of holes therein extending along a line longitudinally along said drum, said holes having become enlarged or elongated as a result of corrosion, overheating or the like, said method comprising the steps of adding a weld material to said drum in the area of said holes to reduce substantially the size of said holes and thus provide smaller holes, providing an assembly including a movably mounted tool with a cutter element larger in dimension than said smaller holes with said tool being movable longiTudinally on said assembly, fixedly mounting said assembly inside of said drum in a predetermined position, moving said tool sequentially in steps with said assembly in place longitudinally within said drum to positions in alignment with said smaller holes, and machining away part of said weld material to produce a set of longitudinal holes corresponding to the dimensions of said cutter element.
Claim 3
Dependent Claim
86 words
A method as set forth in claim 1, wherein said plurality of holes in said drum also extend about the circumference of said drum and including the additional steps of rotatably mounting said tool in said shaft, rotating said tool within said drum with said assembly in place in alignment with said smaller holes extending about the circumference of said drum, and machining away part of said weld material about the circumference of said drum to produce holes corresponding to the dimensions of said cutter element.
Claim 4
Dependent Claim
32 words
A method as set forth in claim 2, wherein the additional steps are provided of adjusting the rotational axis of said tool to substantial alignment with the longitudinal axis of said drum.
Claim 5
Dependent Claim
40 words
A method as set forth in claim 3, wherein the additional steps are provided of sequentially drilling an additional set of circumferentially spaced holes after moving said tool a predetermined distance after the drilling of each individual set of holes.
Claim 6
Independent Claim
116 words
A method of repairing a plurality of irregularly shaped damaged holes in a drum comprising the steps of adding a weld material to said drum in the area of said holes to reduce substantially the size of said holes and thus provide smaller holes, inserting apparatus including a movably mounted machine tool with a cutting element inside of said drum, machining said smaller holes to a circular shape with said apparatus in place, inserting metal rings into said circular shaped holes, expanding said rings to provide tight mechanical seals with said drum, inserting tubes into said rings, and expanding the ends of said tubes to provide tight mechanical seals with the interior surfaces of said rings.
Claim 7
Independent Claim
116 words
A method of repairing a plurality of irregularly shaped damaged holes in a drum comprising the steps of adding a weld material to said drum in the area of said holes to reduce substantially the size of said holes and thus provide smaller holes, inserting apparatus including a movably mounted machine tool with a cutting element inside of said drum, machining said smaller holes to a circular shape with said apparatus in place, inserting metal rings into said circular shaped holes, expanding said rings to provide tight mechanical seals with said drum, inserting tubes into said rings, and expanding the ends of said tubes to provide tight mechanical seals with the interior surfaces of said rings.
Claim 8
Independent Claim
141 words
A method of repairing a cylindrical drum having a plurality of enlarged or elongated holes extending around the circumference of said drum, said method comprising the steps of adding a weld material to said drum in the area of said holes to reduce substantially the size of said holes and thus provide smaller holes, providing an assembly including a tool with a cutter element larger in dimensions than said smaller holes with said tool being rotatable on said assembly, fixedly mounting said assembly within said drum in a predetermined position, rotating said tool sequentially in steps with said assembly in place within said drum to positions in alignment with said smaller holes, and machining away part of said weld material to produce a set of circular holes around the circumference of said drum corresponding to the dimensions of said cutter element.
Claim 9
Independent Claim
141 words
A method of repairing a cylindrical drum having a plurality of enlarged or elongated holes extending around the circumference of said drum, said method comprising the steps of adding a weld material to said drum in the area of said holes to reduce substantially the size of said holes and thus provide smaller holes, providing an assembly including a tool with a cutter element larger in dimensions than said smaller holes with said tool being rotatable on said assembly, fixedly mounting said assembly within said drum in a predetermined position, rotating said tool sequentially in steps with said assembly in place within said drum to positions in alignment with said smaller holes, and machining away part of said weld material to produce a set of circular holes around the circumference of said drum corresponding to the dimensions of said cutter element.
Claim 10
Dependent Claim
46 words
A method as set forth in claim 5 wherein the step of machining comprises machining the circular holes to have tapered edges and further including the step of inserting into said circular holes metal rings having tapered edges corresponding to the tapers of said circular holes.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |