US3894328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of lining pipes
Assignee: Stabilator AB
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Filing: 1973-09-04
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Granted: 1975-07-15
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Expires: 1993-09-04
Abstract
Abstract A method of lining pipes, in which a flexible tube or hose having a surface diameter corresponding to the inner diameter of the pipe is radially contracted before being placed in the pipe, the tube being held in the contracted state by wires or bands of mainly non-metallic material which are arranged around the periphery of the tube, said wires or bands, after the tube has been inserted into the pipe, being cut off or pulled off in order to release their hold on the tube.
Inventors
- 👤 Lennart Erik Elof Jansson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:38
CPC Classifications
F; F16; F16L; F16L58/00; F16L58/02; F16L58/04; F16L58/10; F16L58/1009; F16L58/1027; B; B29; B29C; B29C63/00; B29C63/26; B29C63/34; B29C63/343; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/4987; Y10T29/49872; Y10T29/53; Y10T29/53657
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
323 words
A method of internally lining a pipe laid in the ground and having an annular interior surface surrounding a hollow pipe interior, a tubular liner of resiliently contractible material including an outer annular surface between its ends, the outer annular surface of the liner having an outside diameter substantially corresponding to the inside diameter of the interior surface of said pipe, said method comprising the steps of contracting the tubular liner from its normal tubular size to a contracted condition having a diameter substantially less than the inside diameter of said pipe, the contracted liner having a radially inwardly extending V-shaped section interposed between and connected to an outer circumferential section of the contracted liner; emplacing a plurality of continuous jointless-type flexible circumferential bands about and in engagement with outer surface portions of the circumferential section of the contracted liner, the plurality of emplaced bands being in axially spaced relation to each other along the length of the contracted liner so as to hold the contracted liner in the contracted condition, each one of the plurality of emplaced hands being of substantially uniform thickness about its circumference and of relatively thin construction so as to provide a minimal raised edge above and about the outer surface portions of the circumferential section of the contracted liner; inserting the contracted liner together with the plurality of emplaced bands into the hollow pipe interior at one end of said pipe without the contracted liner and the plurality of emplaced bands becoming frictionally bound against the interior surface of said pipe prior to the expansion of the contracted liner; and severing by using knife means moveable longitudinally of the liner the plurality of emplaced bands from about the contracted liner inserted in the hollow pipe interior so as to effect expansion of the liner until the outer surface of the liner is disposed in engagement about and along the interior surface of said pipe between its ends.
Claim 2
Independent Claim
323 words
A method of internally lining a pipe laid in the ground and having an annular interior surface surrounding a hollow pipe interior, a tubular liner of resiliently contractible material including an outer annular surface between its ends, the outer annular surface of the liner having an outside diameter substantially corresponding to the inside diameter of the interior surface of said pipe, said method comprising the steps of contracting the tubular liner from its normal tubular size to a contracted condition having a diameter substantially less than the inside diameter of said pipe, the contracted liner having a radially inwardly extending V-shaped section interposed between and connected to an outer circumferential section of the contracted liner; emplacing a plurality of continuous jointless-type flexible circumferential bands about and in engagement with outer surface portions of the circumferential section of the contracted liner, the plurality of emplaced bands being in axially spaced relation to each other along the length of the contracted liner so as to hold the contracted liner in the contracted condition, each one of the plurality of emplaced hands being of substantially uniform thickness about its circumference and of relatively thin construction so as to provide a minimal raised edge above and about the outer surface portions of the circumferential section of the contracted liner; inserting the contracted liner together with the plurality of emplaced bands into the hollow pipe interior at one end of said pipe without the contracted liner and the plurality of emplaced bands becoming frictionally bound against the interior surface of said pipe prior to the expansion of the contracted liner; and severing by using knife means moveable longitudinally of the liner the plurality of emplaced bands from about the contracted liner inserted in the hollow pipe interior so as to effect expansion of the liner until the outer surface of the liner is disposed in engagement about and along the interior surface of said pipe between its ends.
Claim 3
Dependent Claim
91 words
The method according to claim 1 wherein the top of the V-shaped section has opposed and spaced ends adjacent to opposed and spaced ends of the circumferential section; certain portions of each one of the plurality of emplaced bands being disposed across and extending chordally between the ends of the V-shaped section so as to enhance the clearance between the ends of the V-shaped section and the interior surface of said pipe upon the contracted liner together with the plurality of bands emplaced thereabout being inserted into the hollow pipe interior.
Claim 4
Dependent Claim
47 words
The method according to claim 1 wherein the step of severing the plurality of emplaced bands is effected by said knife means including a knife device travelling relative to the V-shaped section of the liner and into engagement with each one of the plurality of emplaced bands.
Claim 5
Dependent Claim
26 words
The method according to claim 1 wherein the step of severing the plurality of emplaced bands is effected by said knife means including a heated wire.
Claim 6
Dependent Claim
85 words
The method according to claim 1 wherein the step of severing the plurality of emplaced bands includes the additional steps of closing and sealing off opposed ends of the contracted liner inserted in the hollow pipe interior and the further step of introducing fluid under pressure between the sealed and closed off ends of the contracted liner so as to effect expansion of the liner until the outer surface of the liner is disposed in engagement about and along the interior surface of said pipe.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |