US5087308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of connecting pipes of plastics material of a double pipe system
Assignee: Georg Fischer AG
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Filing: 1990-07-06
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Granted: 1992-02-11
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Expires: 2010-07-06
Abstract
Abstract A method of connecting pipes of plastics material of a double pipe system and a pipe connection made by the method. The inner pipes of the pipe system are connected to each other with a sleeve member by welding or gluing. Clamping jaws are used for holding and moving the inner pipes toward each other. The outer pipes are shorter than the inner pipes at least by the thickness of the two clamping jaws. For bridging the gap between the outer pipes, an expandable intermediate ring is inserted in the gap. An electric welding sleeve is used for connecting the outer pipes and the intermediate ring.
Inventors
- 👤 Jorg Wermelinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:52
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/50; B29C66/51; B29C66/52; B29C66/522; B29C66/5229; B29C66/52298; B29C65/00; B29C65/02; B29C65/18; B29C65/20; B29C65/78; B29C65/7802; B29C66/01; B29C66/05; B29C66/10; B29C66/12; B29C66/122; B29C66/1222; B29C66/1224; B29C66/124; B29C66/1244; B29C66/12441; B29C66/1246; B29C66/12469; B29C66/5221; B29C66/52291; B29C66/52292; B29C66/63; B29C66/636; B29C66/70; B29C66/72; B29C66/725; B29C66/7252; B29C66/72523; F; F16; F16L; F16L39/00; F16L39/005; F16L47/00; F16L47/02; B29L; B29L2023/00; B29L2023/22; B29L2024/00; B29L2031/00; B29L2031/60; B29L2031/601; B29L2031/602; B29L2031/603; B29L2031/605
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
177 words
In a method of connecting pipes of plastics material of a double pipe system having inner and outer pipes, wherein the inner pipes are rigidly connected by means of a sleeve member and the outer pipes are rigidly connected by means of a welding sleeve, the improvement comprising holding the ends of the inner pipes to be connected concentrically relative to each other by means of clamping jaws and moving the ends of the inner pipes axially together with the clamping jaws until the inner pipes are rigidly connected by means of the sleeve member, spacing the outer pipes apart at the connection location by a distance which corresponds at least to the thickness of the clamping jaws, pushing an expandable intermediate ring which is provided with a radial slot over the inner pipes after the inner pipes have been connected and radially inserting the intermediate ring between the ends of the outer pipes, and rigidly connecting the two ends of the outer pipes and the intermediate ring to each other by means of the welding sleeve.
Claim 2
Dependent Claim
177 words
In a method of connecting pipes of plastics material of a double pipe system having inner and outer pipes, wherein the inner pipes are rigidly connected by means of a sleeve member and the outer pipes are rigidly connected by means of a welding sleeve, the improvement comprising holding the ends of the inner pipes to be connected concentrically relative to each other by means of clamping jaws and moving the ends of the inner pipes axially together with the clamping jaws until the inner pipes are rigidly connected by means of the sleeve member, spacing the outer pipes apart at the connection location by a distance which corresponds at least to the thickness of the clamping jaws, pushing an expandable intermediate ring which is provided with a radial slot over the inner pipes after the inner pipes have been connected and radially inserting the intermediate ring between the ends of the outer pipes, and rigidly connecting the two ends of the outer pipes and the intermediate ring to each other by means of the welding sleeve.
Claim 3
Dependent Claim
15 words
The method according to claim 1, comprising gluing the sleeve member to the inner pipes.
Claim 4
Dependent Claim
15 words
The method according to claim 1, comprising welding the sleeve member to the inner pipes.
Claim 5
Dependent Claim
20 words
The method according to claim 1, wherein the welding sleeves for connecting the outer pipes includes an electric filament winding.
References Cited (Backward Citations)
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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) | 1995-02-10 | 1995-08-12 | 1996-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-10 | 1999-08-12 | 2000-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-10 | 2003-08-12 | 2004-02-11 | $7700.00 | Window Closed / Lapsed |