US4927642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for welding tubular components of thermoplastic material
Assignee: Georg Fischer AG
•
Filing: 1988-08-29
•
Granted: 1990-05-22
•
Expires: 2008-08-29
Abstract
Abstract An apparatus for welding tubular components of thermoplastic material. The apparatus includes a heating device for heating the ends of the tubular components to be welded together until the melting range of the thermoplastic material is reached. Two outer support rings which are slid toward each other after the thermoplastic material has melted and an expandable inner support member ensure that welding pressure is built up, so that a welded connection can be obtained which is strong and free of welding beads.
Inventors
- 👤 Peter Kunz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:49
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/50; B29C66/63; B29C66/634; B29B; B29B13/00; B29B13/02; B29B13/023; B29B13/024; B29B13/025; B29C65/00; B29C65/02; B29C65/14; B29C65/1429; B29C65/1432; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/114; B29C66/1142; B29C66/32; B29C66/324; B29C66/3242; B29C66/326; B29C66/3262; B29C66/51; B29C66/52; B29C66/522; B29C66/5221; B29C66/70; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/02; B29C66/024; B29C66/0242; B29L; B29L2023/00; B29L2023/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
170 words
Apparatus for welding tubular components of thermoplastic material, the tubular components having an axis, ends to be joined facing each other and an inner and an outer circumference, the apparatus comprising bracing devices for holding and moving the tubular components coaxially and toward each other, an annular heating device positioned between the bracing devices for generating radiation heat for heating the spaced-apart ends of the tubular components by radiation heat without contact at the outer circumference thereof at least until the melting point of the thermoplastic material is reached, preheatable support rings slidable toward each other in axial direction on the outer circumference of the tubular components prior to joining the ends of the tubular components, said support rings positioned intermediate the bracing devices and within the annular heating device, and an expandable support means positioned within the support rings and annular heating device, said expandable support means capable of being pressed against the inner circumference of the tubular components after the ends of the tubular components have been joined.
Claim 2
Dependent Claim
170 words
Apparatus for welding tubular components of thermoplastic material, the tubular components having an axis, ends to be joined facing each other and an inner and an outer circumference, the apparatus comprising bracing devices for holding and moving the tubular components coaxially and toward each other, an annular heating device positioned between the bracing devices for generating radiation heat for heating the spaced-apart ends of the tubular components by radiation heat without contact at the outer circumference thereof at least until the melting point of the thermoplastic material is reached, preheatable support rings slidable toward each other in axial direction on the outer circumference of the tubular components prior to joining the ends of the tubular components, said support rings positioned intermediate the bracing devices and within the annular heating device, and an expandable support means positioned within the support rings and annular heating device, said expandable support means capable of being pressed against the inner circumference of the tubular components after the ends of the tubular components have been joined.
Claim 3
Dependent Claim
29 words
The apparatus according to claim 1, wherein the heating device and the support rings are each constructed of two pieces, the two pieces being hinged relative to each other.
Claim 4
Dependent Claim
23 words
The apparatus according to claim 1, wherein the expandable support means is an elastic casing, a pull strand being connected to the casing.
References Cited (Backward Citations)
SU200141A1
Cited
DE312270C
Cited
US3013925A
Cited
US3634167A
Cited
US3484321A
Cited
US3666586A
Cited
DE2302559A1
Cited
DE2308078A1
Cited
US4239574A
Cited
SU514670A1
Cited
SU573363A1
Cited
US4211594A
Cited
SU563298A1
Cited
GB1549169A
Cited
US4132578A
Cited
SU642191A1
Cited
WO1980002124A1
Cited
EP0020915A1
Cited
US4449038A
Cited
JPS5829617A
Cited
US4602974A
Cited
DD215039A1
Cited
SU1141006A1
Cited
JPS61114827A
Cited
US4801349A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-21 | 1993-11-20 | 1994-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-21 | 1997-11-20 | 1998-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-21 | 2001-11-20 | 2002-05-22 | $7700.00 | Window Closed / Lapsed |