US3898028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for cooling plastics material tubing made by a blow head
Assignee: Windmoeller and Hoelscher KG
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Filing: 1973-12-13
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Granted: 1975-08-05
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Expires: 1993-12-13
Abstract
Abstract The apparatus serves for air cooling and provides for an exchange of the internal cooling air through a central opening of the blow head. Air supply rings having outlet slots facing the tubing as well as air-guiding surfaces of small axial length are provided inside the tubing and spaced from the annular die orifice and serve to support the tubing. The cooling air supply rings have axially directed passages for the flow of the cooling air discharged by the lower cooling air supply rings.
Inventors
- 👤 Hartmut Upmeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:52
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/90; B29C48/901; B29C48/903; B29C48/03; B29C48/09; B29C48/10; B29C48/885; B29C48/89; B29C48/911; B29C48/9115; B29C48/912; B29C48/902
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
146 words
In an apparatus for cooling plastics material tubing, made by a blow head of the type having a central air passageway defined therein, a central tube axially aligned within said central passageway and projecting into the tubing being made, an annular die orifice, and at least two axially spaced guide rings positioned inside the tubing being made axially spaced from said annular die orifice and radially surrounding said central tube to define an axially extending annular passageway, the improvement comprising the guide rings being hollow and having axially extending guiding faces on the outer peripheries thereof, an aperture defined in each said guiding face and air feed means to feed air into the hollow interior of said guide rings, which air is directed by said apertures outwardly against the inner surface of the tubing being made and then is guided axially by said axial guide surfaces.
Claim 2
Dependent Claim
146 words
In an apparatus for cooling plastics material tubing, made by a blow head of the type having a central air passageway defined therein, a central tube axially aligned within said central passageway and projecting into the tubing being made, an annular die orifice, and at least two axially spaced guide rings positioned inside the tubing being made axially spaced from said annular die orifice and radially surrounding said central tube to define an axially extending annular passageway, the improvement comprising the guide rings being hollow and having axially extending guiding faces on the outer peripheries thereof, an aperture defined in each said guiding face and air feed means to feed air into the hollow interior of said guide rings, which air is directed by said apertures outwardly against the inner surface of the tubing being made and then is guided axially by said axial guide surfaces.
Claim 3
Dependent Claim
21 words
The apparatus according to claim 1 comprising the further improvement of axially spaced annular beads positioned on each said guiding face.
Claim 4
Dependent Claim
38 words
The apparatus according to claim 1 comprising the further improvement of the air feed means including pipes connecting said guide rings with the pipe diameter being reduced as a function of the spacing from the annular die orifice.
Claim 5
Dependent Claim
157 words
In an apparatus for cooling plastics material tubing, made by a blow head of the type having a central air passageway defined therein, a central tube axially defined within said passageway and projecting into the tubing being made, an annular die orifice and at least two axially spaced guide rings positioned inside the tubing axially spaced from said annular die orifice and radially surrounding said central tube to defind an axially extending annular passageway, the improvement comprising the guide rings being hollow and defining apertures in the outer peripheries thereof, axially extending guiding faces defined on the outer periphery of each said guide ring positioned above and below said aperature and means to feed air into the interior of said guide rings so that air fed into each said guide ring is directed against the inner surface of tubing being made by said aperture and then is guided axially by said axial guide surfaces in both directions.
Claim 6
Dependent Claim
157 words
In an apparatus for cooling plastics material tubing, made by a blow head of the type having a central air passageway defined therein, a central tube axially defined within said passageway and projecting into the tubing being made, an annular die orifice and at least two axially spaced guide rings positioned inside the tubing axially spaced from said annular die orifice and radially surrounding said central tube to defind an axially extending annular passageway, the improvement comprising the guide rings being hollow and defining apertures in the outer peripheries thereof, axially extending guiding faces defined on the outer periphery of each said guide ring positioned above and below said aperature and means to feed air into the interior of said guide rings so that air fed into each said guide ring is directed against the inner surface of tubing being made by said aperture and then is guided axially by said axial guide surfaces in both directions.
Claim 7
Dependent Claim
21 words
The apparatus according to claim 4 comprising the further improvement of axially spaced annular beads formed on each said guide surface.
Claim 8
Dependent Claim
32 words
The apparatus according to claim 4 comprising the further improvement of said means to feed air including pipes having decreasing diameters as a function of axial spacing from said annular die orifice.
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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |