US3660000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the continuous manufacture of corrugated plastic pipes by extruding
Assignee: Furukawa Electric Co Ltd
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Filing: 1969-09-09
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Granted: 1972-05-02
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Expires: 1989-09-09
Abstract
Abstract An apparatus for continuous manufacture of helically corrugated plastic pipe from extruded tubing utilizing differential pressure. Thermoplastic material is extruded in a molten state in the form of a tube and the tube is passed over a helically corrugated surface of either an internal mandrel or an external mandrel. A vacuum is supplied between the surface of the cylindrical body and the inside surface of the tube to conform the tube to the surface of the body. A pressure differential is maintained inside the formed pipe, a vacuum being used with the internal mandrel and a pressure with the external mandrel. The cylindrical body is rotated to advance the extruded tube formed thereabout and a cooling fluid is circulated through the cylindrical body to cool the tube as it it formed against the body.
Inventors
- 👤 Tsunemi Yoshida
- 👤 Koichi Ishikawa
- 👤 Masatoshi Ando
- 👤 Yoshihiko Ueno
- 👤 Kunio Arisawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:40
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/0015; B29C48/00; B29C48/03; B29C48/13; B29C48/25; B29C48/30; B29C48/32; B29C48/33; F; F16; F16L; F16L11/00; F16L11/04; F16L11/11; F16L11/111; H; H01; H01B; H01B13/00; H01B13/06; H01B13/14; B29C48/09; B29C48/16; B29C48/18; B29C48/21; B29C48/335; B29C48/34; B29L; B29L2023/00; B29L2023/003
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
196 words
An apparatus for manufacture of helically corrugated plastic pipes by extrusion, comprising a forming cylindrical body provided with a rotation transmitting member, a cylindrical member having a smooth straight cylindrical member with a helically corrugated outer surface over the outside of a multiple layered cylindrical member leaving a space serving as a passage for a cooling medium, said multiple layered member having pipe members arranged concentri-cally and secured within each other leaving a space between them also to serve a passage for the cooling medium and having a hollow pipe innermost to serve as an evacuating passage, with one end connected to an evacuating means, said rotation transmitting member secure to the smooth straight member of the cylindrical body and connected to a driving source, another evacuating passage formed between the nipple holder of an extruder and said cylindrical body and connected to an evacuating means, cooling medium supply and exhaust means connected to said cooling medium passages in the cylindrical body, and said forming cylindrical body inserted in the nipple and a die arranged in a cross head of the extruder to protrude a major portion of the helically corrugated surface forwardly from the die.
Claim 2
Independent Claim
196 words
An apparatus for manufacture of helically corrugated plastic pipes by extrusion, comprising a forming cylindrical body provided with a rotation transmitting member, a cylindrical member having a smooth straight cylindrical member with a helically corrugated outer surface over the outside of a multiple layered cylindrical member leaving a space serving as a passage for a cooling medium, said multiple layered member having pipe members arranged concentri-cally and secured within each other leaving a space between them also to serve a passage for the cooling medium and having a hollow pipe innermost to serve as an evacuating passage, with one end connected to an evacuating means, said rotation transmitting member secure to the smooth straight member of the cylindrical body and connected to a driving source, another evacuating passage formed between the nipple holder of an extruder and said cylindrical body and connected to an evacuating means, cooling medium supply and exhaust means connected to said cooling medium passages in the cylindrical body, and said forming cylindrical body inserted in the nipple and a die arranged in a cross head of the extruder to protrude a major portion of the helically corrugated surface forwardly from the die.
Claim 3
Dependent Claim
54 words
An apparatus according to claim 1 including a linear body introducing means comprising an introducing pipe secured in the hollow pipe innermost of the forming cylindrical body, extending from one end of the forming cylindrical body and having seal means to maintain conditions in the hollow pipe despite continuous passing of the linear body.
Claim 4
Independent Claim
131 words
An apparatus for manufacture of helically corrugated plastic pipes by extruding, comprising a rotation transmitting member rotatably mounted on a sleeve which is secured through a heat insulating material on a forming die secured to a cross head of an extruder, a cylindrical member which is supported by bearings and connected to one side of said rotation transmission member said cylindrical member having inner surface helically corrugated to a desired length, an evacuating pipe secured to the forming die to evacuate a space between the extruded hot plastic pipe and said cylindrical member, and a fluid pressure supply pipe secured to the one end of the apparatus to apply a fluid pressure which is sufficient to conform the hot plastic pipe to the inner helically corrugated configuration of the cylindrical member.
Claim 5
Independent Claim
131 words
An apparatus for manufacture of helically corrugated plastic pipes by extruding, comprising a rotation transmitting member rotatably mounted on a sleeve which is secured through a heat insulating material on a forming die secured to a cross head of an extruder, a cylindrical member which is supported by bearings and connected to one side of said rotation transmission member said cylindrical member having inner surface helically corrugated to a desired length, an evacuating pipe secured to the forming die to evacuate a space between the extruded hot plastic pipe and said cylindrical member, and a fluid pressure supply pipe secured to the one end of the apparatus to apply a fluid pressure which is sufficient to conform the hot plastic pipe to the inner helically corrugated configuration of the cylindrical member.
Claim 6
Independent Claim
135 words
An apparatus for manufacture of helically corrugated plastic pipes by extruding, comprising a forming die secured to a cross head of an extruder, a cylindrical member which is supported by bearings, connected concentrically to the die through a heat insulating material, and which has an inner surface helically corrugated and forming a continuous inner surface to the forward edge of the die, a rotation transmitting member secured to the outer surface of the cylindrical member, an evacuating pipe secured to the forming die to evacuate a space between the extruded hot plastic pipe and said cylindrical member, and a fluid pressure supply pipe secured to the rear end of the apparatus to apply a fluid pressure which is sufficient to conform the hot plastic pipe to the inner helically corrugated configuration of the cylIndrical member.
Claim 7
Independent Claim
135 words
An apparatus for manufacture of helically corrugated plastic pipes by extruding, comprising a forming die secured to a cross head of an extruder, a cylindrical member which is supported by bearings, connected concentrically to the die through a heat insulating material, and which has an inner surface helically corrugated and forming a continuous inner surface to the forward edge of the die, a rotation transmitting member secured to the outer surface of the cylindrical member, an evacuating pipe secured to the forming die to evacuate a space between the extruded hot plastic pipe and said cylindrical member, and a fluid pressure supply pipe secured to the rear end of the apparatus to apply a fluid pressure which is sufficient to conform the hot plastic pipe to the inner helically corrugated configuration of the cylIndrical member.
Claim 8
Dependent Claim
59 words
An apparatus according to claim 3 including a linear body introducing means comprising an introducing pipe which is long enough to reach the foremost end of the rotating cylindrical body and is secured to the rear end of nipple holder of the extruder with seal means to maintain conditions in hollow portion despite continuous passing of the linear body.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |