US5340299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for manufacturing ribbed pipes
Assignee: Uponor Innovation AB
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Filing: 1990-07-05
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Granted: 1994-08-23
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Expires: 2010-07-05
Abstract
Abstract An apparatus for manufacturing from a mouldable material a pipe having ribs on its outer surface and a smooth inner surface has a core including a shaft, a conically widening mandrel located downstream of the shaft in a direction of production and a kernel having an initial zone and an end zone respectively of substantially uniform diameters successively disposed downstream of the mandrel. An extrusion sleeve surrounds the core and forms with the core a nozzle for the material. The extrusion sleeve has a first end face located upstream of the kernel. Moulds encase the extrusion sleeve and the core, the moulds being movable along endless paths and having grooves on inner surfaces for forming the ribs on the pipe. A heater heats the initial zone of the kernel, the initial zone of the kernel being cylindrical. A first cooler cools the end zone of the kernel. A second end face of an upstream outset of the end zone of the kernel conically widens in the direction of production from a smallest diameter substantially corresponding to the diameter of the initial zone to a largest diameter.
Inventors
- 👤 Jyri Jarvenkyla
- 👤 Eino Holso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:30
CPC Classifications
B; B29; B29D; B29D23/00; B29D23/001; B29C; B29C43/00; B29C43/22; B29C43/224; B29C48/00; B29C48/03; B29C48/09; B29C48/13; B29C48/25; B29C48/30; B29C48/303
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
225 words
In an apparatus for manufacturing from a mouldable material a pipe having ribs on its outer surface and a smooth inner surface, the apparatus comprising: a core including a shaft (8), a conically widening mandrel (9) located downstream of the shaft in a direction of production and a kernel (10) having an initial zone (14) and an end zone (15) respectively of substantially uniform diameters successively disposed downstream of the mandrel; an extrusion sleeve (4) surrounding the core and forming with the core a nozzle (11) for the material, the extrusion sleeve having a first end face located upstream of the kernel (10); and moulds (1, 2) encasing the extrusion sleeve and the core, the moulds being movable along endless paths and having grooves (13) on inner surfaces for forming the ribs on the pipe (7), the improvements further comprising: heating means (18) for heating the initial zone of the kernel, the initial zone of the kernel being cylindrical; first cooling means (19) for cooling the end zone of the kernel; and a second end face (20) of an upstream outset of the end zone of the kernel, the second end face conically widening in the direction of production from a smallest widening in the direction of production from the smallest diameter substantially corresponding to the diameter of the initial zone to a largest diameter.
Claim 2
Dependent Claim
225 words
In an apparatus for manufacturing from a mouldable material a pipe having ribs on its outer surface and a smooth inner surface, the apparatus comprising: a core including a shaft (8), a conically widening mandrel (9) located downstream of the shaft in a direction of production and a kernel (10) having an initial zone (14) and an end zone (15) respectively of substantially uniform diameters successively disposed downstream of the mandrel; an extrusion sleeve (4) surrounding the core and forming with the core a nozzle (11) for the material, the extrusion sleeve having a first end face located upstream of the kernel (10); and moulds (1, 2) encasing the extrusion sleeve and the core, the moulds being movable along endless paths and having grooves (13) on inner surfaces for forming the ribs on the pipe (7), the improvements further comprising: heating means (18) for heating the initial zone of the kernel, the initial zone of the kernel being cylindrical; first cooling means (19) for cooling the end zone of the kernel; and a second end face (20) of an upstream outset of the end zone of the kernel, the second end face conically widening in the direction of production from a smallest widening in the direction of production from the smallest diameter substantially corresponding to the diameter of the initial zone to a largest diameter.
Claim 3
Dependent Claim
34 words
The apparatus as claimed in claim 1, wherein a difference between the smallest and largest diameters of the second end face is from 0.1% to 0.5% of any of the diameters of the kernel.
Claim 4
Dependent Claim
27 words
The apparatus as claimed in claim 1, wherein an angle between the second end face and a central line of the core is from 2° to 45°.
Claim 5
Dependent Claim
19 words
The apparatus as claimed in claim 1, wherein the initial and end zones of the kernel abut each other.
Claim 6
Dependent Claim
16 words
The apparatus as claimed in claim 1, wherein the outset has a layer increasing its hardness.
Claim 7
Dependent Claim
26 words
The apparatus as claimed in claim 5, wherein the outset of the end zone has second cooling means that are separate from the first cooling means.
Claim 8
Dependent Claim
42 words
The apparatus as claimed in claim 1, wherein a length of the end zone (15) of the kernel in the direction of production is about 50% of a total length of the kernel in the direction and is 200 to 1000 mm.
Claim 9
Dependent Claim
13 words
The apparatus as claimed in claim 2, wherein the difference is about 0.25%.
Claim 10
Dependent Claim
13 words
The apparatus as claimed in claim 3, wherein the angle is about 20°.
Claim 11
Dependent Claim
12 words
The apparatus as claimed in claim 5, wherein the layer comprises chromium.
Claim 12
Dependent Claim
27 words
The apparatus as claimed in claim 2, wherein an angle between the second end face and a central line of the core is from 20° to 45°.
Claim 13
Dependent Claim
19 words
The apparatus as claimed in claim 11, wherein the initial and end zones of the kernel abut each other.
Claim 14
Dependent Claim
16 words
The apparatus as claimed in claim 12, wherein the outset has a layer increasing its hardness.
Claim 15
Dependent Claim
26 words
The apparatus as claimed in claim 13, wherein the outset of the end zone has second cooling means that are separate from the first cooling means.
Claim 16
Dependent Claim
42 words
The apparatus as claimed in claim 14, wherein a length of the end zone (15) of the kernel in the direction of production is about 50% of a total length of the kernel in the direction and is 200 to 1000 mm.
Claim 17
Dependent Claim
13 words
The apparatus as claimed in claim 15, wherein the difference is about 0.25%.
Claim 18
Dependent Claim
13 words
The apparatus as claimed in claim 16, wherein the angle is about 20°.
Claim 19
Dependent Claim
12 words
The apparatus as claimed in claim 17, wherein the layer comprises chromium.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-08-22 | 1998-02-21 | 1998-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-22 | 2002-02-21 | 2002-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-22 | 2006-02-21 | 2006-08-23 | $7700.00 | Window Closed / Lapsed |