Plastic article or earthenware shaping or treating: apparatus – Means feeding fluent stock from plural sources to common... – Extrusion shaping means
Reexamination Certificate
2001-07-25
2009-12-01
Davis, Robert B (Department: 1791)
Plastic article or earthenware shaping or treating: apparatus
Means feeding fluent stock from plural sources to common...
Extrusion shaping means
C425S149000, C425S326100, C425S535000
Reexamination Certificate
active
07625196
ABSTRACT:
In a method for manufacturing a double-walled, thermoplastic tube with a connecting sleeve, which enables precise and complete molding of the connecting sleeve by simple means, it is provided that a) a first tube (1) is extruded into a mold tunnel (4) comprising at least one row of molds (5) guided on a path, b) the first tube (1) is given a corrugated shape in at least one first section and expanded into a connecting sleeve in at least one second section, c) a second tube (6) is extruded into the first tube and pressed against the corrugation troughs (8) of the first tube (1), d) while the first tube (1) is being given a corrugated shape and the second tube (6) extruded into the first, the space (A) between the two tubes (1, 6) is subjected to a pressure p1that is above atmospheric pressure, e) the space (A) between the two tubes (1, 6) is subjected, at a specified time before or after expansion of the first tube (1) into a connecting sleeve, to an essentially constant pressure p2≦p1above atmospheric pressure, or to a variable, but not continuously declining pressure p2, f) during extrusion of the second tube (6) into the first tube (1), which has already been expanded into a connecting sleeve, the second tube (6) is internally subjected to a pressure p3above atmospheric pressure and pressed against the first tube (1), and g) pressure p1is subsequently again applied to space (A) between the two tubes.
REFERENCES:
patent: 3212135 (1965-10-01), Branscum
patent: 4365948 (1982-12-01), Chaplain
patent: 4500284 (1985-02-01), Lupke
patent: 4545751 (1985-10-01), Lupke
patent: 4555230 (1985-11-01), Lupke
patent: 4663107 (1987-05-01), Takada et al.
patent: 4741795 (1988-05-01), Grace et al.
patent: 4808098 (1989-02-01), Chan et al.
patent: 4846660 (1989-07-01), Drossbach
patent: 4865797 (1989-09-01), Järvenkylä
patent: 4873048 (1989-10-01), Järvenkylä
patent: 5023029 (1991-06-01), Lupke
patent: 5296188 (1994-03-01), Lupke
patent: 5320797 (1994-06-01), Hegler et al.
patent: 5405569 (1995-04-01), Lupke
patent: 5891383 (1999-04-01), Joseph
patent: 5992469 (1999-11-01), Hegler
patent: 6015282 (2000-01-01), Rahn
patent: 6257866 (2001-07-01), Fritz et al.
patent: 6458311 (2002-10-01), Hegler
patent: 7214051 (2007-05-01), Lupke et al.
patent: 0 890 770 (1990-01-01), None
patent: 0 563 575 (1993-10-01), None
patent: 0 563 575 (1993-12-01), None
patent: 0 995 579 (1999-09-01), None
patent: 0 995 579 (2001-05-01), None
patent: 2 718 509 (1995-10-01), None
patent: 60-79936 (1985-05-01), None
patent: 61148035 (1986-07-01), None
patent: 61242829 (1986-10-01), None
patent: 61261020 (1986-11-01), None
patent: 2000-127220 (2000-05-01), None
patent: WO 85/02144 (1985-05-01), None
patent: WO 95/01251 (1995-01-01), None
Taschenbuch Maschinenbau, Band 3, VEB-Verlag Technik Berlin, 1987, S. 553.
Lupke Manfred A. A.
Lupke Stefan A.
Cahn & Samuels LLP
Davis Robert B
LandOfFree
Device for manufacturing a double-walled, thermoplastic tube... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for manufacturing a double-walled, thermoplastic tube..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for manufacturing a double-walled, thermoplastic tube... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4112922