Patent US3728059A successfully refreshed from Google Patents.
US3728059A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for deforming a plastic pipe
Assignee: Industriele Anderneming Wavin NV
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Filing: 1970-08-31
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Granted: 1973-04-17
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Expires: 1990-08-31
Abstract
Abstract Apparatus and method for providing a thermoplastic pipe with an inner groove, by subjecting a heat plasticized pipe to the action of some rotatably supported rollers which are expanded and rotated by means of a mandril. The assembly of all rollers is caused to move along the inner wall of the plastic pipe in a plane perpendicular to the axis of the pipe.
Inventors
- 👤 Putter W De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:21
CPC Classifications
B; B29; B29C; B29C57/00; B29C57/02; B29C57/04; B29C57/045
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
124 words
A device for providing a heated plastic pipe with at least one groove comprising at least one divided hollow die having on its inner side an annular cavity which corresponds to the outer shape of the finished groove in the finished pipe, radially expandable and resiliently movable deforming means, conically shaped moving means axially movable to effect outward radial movement of said deforming means and being rotatable to effect rotary movement of said deforming means, adjustable time regulating means responsive to extreme outward radial positioning of said deforming means to stop radial movement of said deforming means while maintaining rotary movement thereof, and means for cooling said pipe while said radial movement of said deforming means is stopped and while said rotary motion continues.
Claim 2
Independent Claim
124 words
A device for providing a heated plastic pipe with at least one groove comprising at least one divided hollow die having on its inner side an annular cavity which corresponds to the outer shape of the finished groove in the finished pipe, radially expandable and resiliently movable deforming means, conically shaped moving means axially movable to effect outward radial movement of said deforming means and being rotatable to effect rotary movement of said deforming means, adjustable time regulating means responsive to extreme outward radial positioning of said deforming means to stop radial movement of said deforming means while maintaining rotary movement thereof, and means for cooling said pipe while said radial movement of said deforming means is stopped and while said rotary motion continues.
Claim 3
Dependent Claim
60 words
A device according to claim 1 including driving means to effect axial movement of said moving means and rotative means to effect rotary movement of said moving means, wherein said deforming means are rollers, and wherein said moving means comprises a conical mandril connected to a threaded shaft, said shaft being cooperable with said driving means and said rotative means.
Claim 4
Dependent Claim
49 words
A device according to claim 2 wherein said adjustable time regulating means includes switch means responsive to the axial position of said shaft when said rollers are in extreme outward radial position to render said drive means ineffective to move said shaft and to maintain said rotative means operative.
Claim 5
Dependent Claim
25 words
A device according to claim 3 including cooling means for cooling said die and wherein said switch means also affects operation of said cooling means.
Claim 6
Dependent Claim
27 words
A device according to claim 4 wherein said adjustable time regulating means maintain said rotative means operative until said plastic pipe is cooled to a predetermined temperature.
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |