Patent US4677998A successfully refreshed from Google Patents.
US4677998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for removing pipe coatings
Assignee: Individual
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Filing: 1985-08-16
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Granted: 1987-07-07
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Expires: 2005-08-16
Abstract
Abstract Bituminous and other coatings are removed from a pipe surface by directing powerful water jets, e.g. under a pressure of 300-600 bars, and preferably under an acute angle of incidence, against such pipe surface. The apparatus has one or more nozzles, each provided with water supply means, in a frame that can be mounted around the pipe to be treated. In a preferred embodiment, the nozzles are arranged in groups on rotatable annular discs which surround the pipe with some clearance and which receive a reciprocating rotary movement during operation, while the frame carrying such discs is adapted for travelling in longitudinal direction of the pipe. If both movements are coordinated, i.e. effected simultaneously then, each nozzle will follow a zigzag path along the pipe surface, thereby covering a vast area and removing bituminous or other coatings in a fast and efficient way.
Inventors
- 👤 Dirk F. van Voskuilen
- 👤 Frans van Voskuilen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:24
CPC Classifications
B; B08; B08B; B08B9/00; B08B9/02; B08B9/023; F; F16; F16L; F16L58/00; F16L58/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
120 words
Apparatus for removing bituminous or other coatings from a pipe surface having a circumferential and longitudinal direction, essentially comprising: a frame adapted for being mounted around the pipe to be treated; adjacent nozzles on said frame direction against the pipe surface; means for feeding pressurized water to said nozzles, said nozzles being directed against the pipe surface at an acute impact angle relative to said circumferential direction of the pipe; means for moving each of said nozzles in a zigzag path having the longitudinal direction of the pipe as its main direction, there being an acute angle between each pair of adjacent portions of said zigzag path; and the path of adjacent nozzles being closely spaced in said circumferential direction.
Claim 2
Dependent Claim
120 words
Apparatus for removing bituminous or other coatings from a pipe surface having a circumferential and longitudinal direction, essentially comprising: a frame adapted for being mounted around the pipe to be treated; adjacent nozzles on said frame direction against the pipe surface; means for feeding pressurized water to said nozzles, said nozzles being directed against the pipe surface at an acute impact angle relative to said circumferential direction of the pipe; means for moving each of said nozzles in a zigzag path having the longitudinal direction of the pipe as its main direction, there being an acute angle between each pair of adjacent portions of said zigzag path; and the path of adjacent nozzles being closely spaced in said circumferential direction.
Claim 3
Dependent Claim
31 words
Apparatus as claimed in claim 1, wherein the means for moving the nozzles in a zigzag path comprise travelling wheels and driving rollers carried by said frame and engaging the pipe.
Claim 4
Dependent Claim
13 words
Apparatus as claimed in claim 2, wherein the travelling wheels are adjustably supported.
Claim 5
Dependent Claim
23 words
Apparatus as claimed in claim 2, wherein the driving rollers are supported by hinged levers which are biased to engage a pipe surface.
Claim 6
Dependent Claim
138 words
Apparatus for removing bituminous or other coatings from a pipe surface having a circumferential and longitudinal direction, essentially comprising: a frame adapted for being mounted around the pipe to be treated; nozzles directed against the pipe surface on said frame; means for feeding pressurized water to said nozzles; means for moving the nozzles in said longitudinal as well as in said circumferential direction along the pipe surface in a zigzag path, there being an acute angle between each pair of adjacent portions of said zigzag path, said means for moving the nozzles in said circumferential direction comprise one or more rotatable annular discs positioned in planes perpendicular to the longitudinal axis of the pipe and surrounding the pipe concentrically with some spacing, said discs carrying the nozzles in groups; and means for rotating said discs around their axes.
Claim 7
Dependent Claim
138 words
Apparatus for removing bituminous or other coatings from a pipe surface having a circumferential and longitudinal direction, essentially comprising: a frame adapted for being mounted around the pipe to be treated; nozzles directed against the pipe surface on said frame; means for feeding pressurized water to said nozzles; means for moving the nozzles in said longitudinal as well as in said circumferential direction along the pipe surface in a zigzag path, there being an acute angle between each pair of adjacent portions of said zigzag path, said means for moving the nozzles in said circumferential direction comprise one or more rotatable annular discs positioned in planes perpendicular to the longitudinal axis of the pipe and surrounding the pipe concentrically with some spacing, said discs carrying the nozzles in groups; and means for rotating said discs around their axes.
Claim 8
Dependent Claim
29 words
Apparatus as claimed in claim 5, wherein the means for rotating the annular discs are adapted for giving the discs a reciprocating rotational movement with a limited rotation angle.
Claim 9
Dependent Claim
29 words
Apparatus as claimed in claim 6, wherein the rotation means comprise a rope passing over a driving roller, as well as a rack-and-pinion system acting on the driving roller.
Claim 10
Dependent Claim
31 words
Apparatus as claimed in claim 5, wherein the rotation means of two adjacent discs are coupled so as to cause the discs to rotate at any time in mutually opposite directions.
References Cited (Backward Citations)
US1611920A
Cited
US1941002A
Cited
US1898964A
Cited
US2427129A
Cited
US2470994A
Cited
US2858555A
Cited
US2966134A
Cited
US3117401A
Cited
DE1658396A1
Cited
US3641608A
Cited
US3933519A
Cited
US3916469A
Cited
US3985572A
Cited
US4169427A
Cited
EP0000808A1
Cited
US4205694A
Cited
US4160457A
Cited
US4229121A
Cited
US4205407A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-06 | 1991-01-05 | 1991-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-06 | 1995-01-05 | 1995-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-06 | 1999-01-05 | 1999-07-07 | $7700.00 | Window Closed / Lapsed |