Patent US3755883A successfully refreshed from Google Patents.
US3755883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacturing a spiral multi-layer pipe
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1971-08-27
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Granted: 1973-09-04
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Expires: 1991-08-27
Abstract
Abstract A method of manufacturing a multi-layer pipe for pressure apparatus purposes, which pipe consists of a hoop spirally wound around and fastened to the outer surface of an inner cylinder, characterized in that a wedge-shaped filler and the hoop, held together in a body, are fixed to each other by tack welds at both sides of the wedge-shaped filler at the end leading to the inner cylinder, then they are wound around the inner cylinder and the tack welds are removed after forming a starting laminate of many layers of the hoop, and then are wound again to complete the whole laminate.
Inventors
- 👤 D Shimizu
- 👤 M Tasaka
- 👤 K Saotome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:01
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/154; B21D; B21D51/00; B21D51/16; B21D51/24
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
123 words
A method of manufacturing a multi-layer pipe for pressure apparatus purposes, which pipe consists of a hoop spirally wound around and fastened to the outer surface of an inner cylinder comprising the steps of: a. placing a wedge-shaped filler on the inner cylinder, said filler outer end being secured by welding to the leading end of the hoop, the longitudinal axis of the filler and hoop material being aligned with the plane perpendicular to the axis of the cylinder; b. spirally wrapping said filler and hoop around said cylinder while tack welding the longitudinal edges of the filler to said cylinder ends; and, c. removing said tack welds after forming a starting laminate and winding the hoop again to complete the whole laminate.
Claim 2
Independent Claim
123 words
A method of manufacturing a multi-layer pipe for pressure apparatus purposes, which pipe consists of a hoop spirally wound around and fastened to the outer surface of an inner cylinder comprising the steps of: a. placing a wedge-shaped filler on the inner cylinder, said filler outer end being secured by welding to the leading end of the hoop, the longitudinal axis of the filler and hoop material being aligned with the plane perpendicular to the axis of the cylinder; b. spirally wrapping said filler and hoop around said cylinder while tack welding the longitudinal edges of the filler to said cylinder ends; and, c. removing said tack welds after forming a starting laminate and winding the hoop again to complete the whole laminate.
Claim 3
Dependent Claim
169 words
A process of manufacturing a multi-layer pipe for pressure apparatus purposes which pipe consists of a hoop spirally wound around and fastened to the outer surface of an inner cylinder, comprising the steps of: a. placing an inner cylinder in contact with two spaced apart rollers; b. placing a wedge-shaped filler on said cylinder, said filler being secured by welding to the leading end of the hoop, the longitudinal axis of the filler and hoop being aligned with the plane perpendicular to the axis of the cylinder and pressing down on said filler with a curved block to force said filler shape to conform to the cylinder curve while pressing down on said block with a roller; c. tack welding the longitudinal edges of the filler to the surface of said cylinder while curving said filler around said cylinder; d. spirally winding said hoop material around said cylinder; and, e. removing said tack welds after forming a starting laminate and winding the hoop again to complete the whole laminate.
Claim 4
Dependent Claim
169 words
A process of manufacturing a multi-layer pipe for pressure apparatus purposes which pipe consists of a hoop spirally wound around and fastened to the outer surface of an inner cylinder, comprising the steps of: a. placing an inner cylinder in contact with two spaced apart rollers; b. placing a wedge-shaped filler on said cylinder, said filler being secured by welding to the leading end of the hoop, the longitudinal axis of the filler and hoop being aligned with the plane perpendicular to the axis of the cylinder and pressing down on said filler with a curved block to force said filler shape to conform to the cylinder curve while pressing down on said block with a roller; c. tack welding the longitudinal edges of the filler to the surface of said cylinder while curving said filler around said cylinder; d. spirally winding said hoop material around said cylinder; and, e. removing said tack welds after forming a starting laminate and winding the hoop again to complete the whole laminate.
Claim 5
Independent Claim
117 words
A method of manufacturing a multi-layer pipe for pressure apparatus purpose, which pipe consists of a hoop spirally wound around and fastened to the outer surface of an inner cylinder, comprising the steps of: a. placing a wedge-shaped filler on the inner cylinder, said filler and hoop being held together in a body, the longitudinal axis of the filler and hoop material being aligned with the plane perpendicular to the axis of the b. spirally wrapping said filler and hoop around said cylinder while tack welding the longitudinal edges of the filler to said cylinder ends; and, c. removing said tack welds after forming a starting laminate and winding the hoop again to complete the whole laminate.
Claim 6
Independent Claim
117 words
A method of manufacturing a multi-layer pipe for pressure apparatus purpose, which pipe consists of a hoop spirally wound around and fastened to the outer surface of an inner cylinder, comprising the steps of: a. placing a wedge-shaped filler on the inner cylinder, said filler and hoop being held together in a body, the longitudinal axis of the filler and hoop material being aligned with the plane perpendicular to the axis of the b. spirally wrapping said filler and hoop around said cylinder while tack welding the longitudinal edges of the filler to said cylinder ends; and, c. removing said tack welds after forming a starting laminate and winding the hoop again to complete the whole laminate.
Claim 7
Dependent Claim
165 words
A process of manufacturing a multi-layer pipe for pressure apparatus purposes which pipe consists of a hoop spirally wound around and fastened to the outer surface of an inner cylinder, comprising the steps of: a. placing an inner cylinder in contact with two spaced aprart rollers; b. placing a wedge-shaped filler on said cylinder, said filler and hoop held together in a body, the longitudinal axis of the filler and hoop being aligned with the plane perpendicular to the axis of the cylinder and pressing down on said filler with a curved block to force said filler shape to conform to the cylinder curve while pressing down on said block with a roller; c. tack welding the longitudinal edges of the filler to the surface of said cylinder while curving said filler around said cylinder; d. spirally winding said hoop material around said cylinder; and, e. removing said tack welds after forming a starting laminate and winding the hoop again to complete the whole laminate.
Claim 8
Dependent Claim
165 words
A process of manufacturing a multi-layer pipe for pressure apparatus purposes which pipe consists of a hoop spirally wound around and fastened to the outer surface of an inner cylinder, comprising the steps of: a. placing an inner cylinder in contact with two spaced aprart rollers; b. placing a wedge-shaped filler on said cylinder, said filler and hoop held together in a body, the longitudinal axis of the filler and hoop being aligned with the plane perpendicular to the axis of the cylinder and pressing down on said filler with a curved block to force said filler shape to conform to the cylinder curve while pressing down on said block with a roller; c. tack welding the longitudinal edges of the filler to the surface of said cylinder while curving said filler around said cylinder; d. spirally winding said hoop material around said cylinder; and, e. removing said tack welds after forming a starting laminate and winding the hoop again to complete the whole laminate.
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) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |