Patent DE2700521C2 successfully refreshed from Google Patents.
US3706624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making plastic hose
Assignee: HBD INDUSTRIES Inc
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Filing: 1969-01-21
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Granted: 1972-12-19
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Expires: 1989-01-21
Abstract
Abstract An apparatus for making continuous reinforced plastic hose by extruding a ribbon of heated plastic, with portions having compositions of different stiffness, winding the ribbon in a continuous helix over two spaced rotating mandrels, and uniting adjacent pitches of the helix during the winding to form a continuous tube. In one embodiment, The mandrels are mutually skewed with one mandrel being power-rotated and the other free to rotate. In that embodiment, the hose is axially advanced by the axial component of rotation of the skewed mandrels. Another embodiment provides for winding of the ribbon over parallel mandrels with the free mandrel having longitudinally sequentially reciprocating slats to axially advance the tubing.
Inventors
- 👤 William R Rinker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:10
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/80; B29C53/82; B29C53/821; B29C53/825; B29C53/827; B29C53/56; B29C53/58; B29C53/60; B29C53/607
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
138 words
An apparatus for making continuous flexible plastic tubing comprising: a. means for supplying a single continuous ribbon of heated plastic material having a core of greater stiffness encased therein; b. a first rotatable mandrel means disposed with its axis o rotation substantially perpendicular to the direction of supply of said ribbon onto its periphery; c. a second rotatable mandrel means spaced from said first mandrel means and adapted to receive said ribbon thereover in a helical coil; d. means engaging said coil and exerting pressure thereon to axially unite adjacent pitches of the ribbon into a longitudinally continuous relationship; e. means for exerting a force on only the inner periphery of said coil to advance said coil axially over said mandrels including drive means operatively connected to only said first mandrel means for rotating it about its axis.
Claim 2
Independent Claim
138 words
An apparatus for making continuous flexible plastic tubing comprising: a. means for supplying a single continuous ribbon of heated plastic material having a core of greater stiffness encased therein; b. a first rotatable mandrel means disposed with its axis o rotation substantially perpendicular to the direction of supply of said ribbon onto its periphery; c. a second rotatable mandrel means spaced from said first mandrel means and adapted to receive said ribbon thereover in a helical coil; d. means engaging said coil and exerting pressure thereon to axially unite adjacent pitches of the ribbon into a longitudinally continuous relationship; e. means for exerting a force on only the inner periphery of said coil to advance said coil axially over said mandrels including drive means operatively connected to only said first mandrel means for rotating it about its axis.
Claim 3
Dependent Claim
19 words
The apparatus defined in claim 1, wherein said second mandrel is disposed in skewed arrangement with said first mandrel.
Claim 4
Dependent Claim
35 words
The apparatus defined in claim 1, wherein said means engaging said coil is a cylindrical pressure roller spaced closely adjacent said first mandrel means for pressing said ribbon as it passes over said first mandrel.
Claim 5
Dependent Claim
36 words
The apparatus defined in claim 1 further comprising a support means axially spaced from said first mandrel and exerting a supporting force on the exterior thereof as it advances axially from the ends of said mandrels.
Claim 6
Dependent Claim
36 words
The apparatus defined in claim 1, wherein said first mandrel has its length not greater than 10 diameters of the tubing and said second mandrel has its length not greater than four diameters of said tubing.
Claim 7
Dependent Claim
25 words
The apparatus defined in claim 1, wherein said second mandrel is parallel to said first mandrel and comprises coil-engaging means thereon cyclicAlly movable axially thereof.
Claim 8
Dependent Claim
42 words
The apparatus defined in claim 6, wherein the said coil-engaging means comprises a plurality of slats disposed in axially parallel arrangement about the periphery of said second mandrel, and means for oscillating said slats axially for advancing said tubing along said mandrels.
Claim 9
Dependent Claim
38 words
The apparatus defined in claim 1, wherein said second mandrel has a cam formed thereon and each slat has a cam follower operatively connected to said cam for sequentially oscillating said slats as said second mandrel is rotated.
Claim 10
Dependent Claim
31 words
The apparatus defined in claim 8, wherein said cam has a cyclic period of one revolution and each of said slats is subjected to maximum axial displacement upon one-half revolution thereof.
Claim 11
Dependent Claim
30 words
The apparatus defined in claim 9, wherein said cam is shaped for quick return of each slat to its initial position after each slat has reached its maximum axial displacement.
Claim 12
Independent Claim
161 words
An apparatus for making continuous flexible plastic tubing comprising: a. at least two extruders; b. a common die connected to said extruders and adapted to pass a single continuous ribbon of heated plastic material therethrough, said material having at least two continuous longitudinal portions in continuous adjacent contact which portions have compositions of different stiffness; c. a first rotatable mandrel means disposed with its axis of rotation substantially perpendicular to the direction of extrusion from said die for receiving said ribbon; d. a second rotatable mandrel means spaced from said first mandrel means and disposed in skewed arrangement thereto, said mandrels being adapted to receive said ribbon thereover in a helical coil; e. means engaging said coil and exerting pressure thereon to unit adjacent pitches of the ribbon into a longitudinally continuous relationship; and f. drive means operatively connected to only said first mandrel means for rotating same about its axis and thereby axially advancing said coil to form a tube.
Claim 13
Independent Claim
161 words
An apparatus for making continuous flexible plastic tubing comprising: a. at least two extruders; b. a common die connected to said extruders and adapted to pass a single continuous ribbon of heated plastic material therethrough, said material having at least two continuous longitudinal portions in continuous adjacent contact which portions have compositions of different stiffness; c. a first rotatable mandrel means disposed with its axis of rotation substantially perpendicular to the direction of extrusion from said die for receiving said ribbon; d. a second rotatable mandrel means spaced from said first mandrel means and disposed in skewed arrangement thereto, said mandrels being adapted to receive said ribbon thereover in a helical coil; e. means engaging said coil and exerting pressure thereon to unit adjacent pitches of the ribbon into a longitudinally continuous relationship; and f. drive means operatively connected to only said first mandrel means for rotating same about its axis and thereby axially advancing said coil to form a tube.
Claim 14
Dependent Claim
33 words
The apparatus defined in claim 11, wherein said means engaging said coil is a pressure roller spaced closely adjacent said first mandrel for pressing said ribbon as it passes over said first mandrel.
Claim 15
Dependent Claim
38 words
The apparatus defined in claim 12 further comprising a support means axially spaced from said first mandrel and exerting a supporting force on the exterior of said tubing as it advances axially from the ends of said mandrels.
Claim 16
Dependent Claim
35 words
The apparatus defined in claim 12, wherein said first mandrel has its length not greater than 10 diameters of tubing and said second mandrel has its length not greater than four diameters of said tubing.
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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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |