US4436987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Weld connection for plastic pipe
Assignee: Georg Fischer AG
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Filing: 1982-09-27
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Granted: 1984-03-13
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Expires: 2002-09-27
Abstract
Abstract An apparatus for forming a weld connection with plastic pipe comprises two molded parts and two heating mats. Each part has an internal surface corresponding to a peripheral portion of the pipe being welded such that a cavity for receiving the pipe is defined by the internal surfaces. The parts are separated by longitudinally extending clearances. Each heating mat comprises a plastic coated resistance wire, is associated with one of the molded parts and has one of its end portions in one of the clearances. The mats completely cover the internal surfaces and the pipe periphery being welded.
Inventors
- 👤 Alfred Thalmann
- 👤 Fritz Reich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:28
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/34; B29C65/3404; B29C65/342; B29C65/3428; B29C65/3472; B29C65/3476; B29C65/348; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/13; B29C66/131; B29C66/1312; B29C66/50; B29C66/51; B29C66/52; B29C66/522; B29C66/5224; B29C66/52241; B29C66/5229; B29C66/52298; B29C66/53; B29C66/532; B29C66/5324; B29C66/53241; F; F16; F16L; F16L47/00; F16L47/02; F16L47/03; B29C65/3468; B29C66/70; B29C66/71; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
112 words
An apparatus for forming a weld connection with plastic pipe, comprising first and second molded plastic parts, each of said parts having an internal surface corresponding to a peripheral portion of the pipe being welded such that said internal surfaces define a cavity for receiving and enclosing the pipe, said parts being separated by first and second longitudinally extending clearances; and first and second heating mats adjacent said internal surfaces of said first and second parts, respectively, each of said mats having one end portion in one of said clearances and comprising a resistance wire coated with plastic, said mats completely covering said internal surfaces and the pipe periphery to be welded.
Claim 2
Independent Claim
112 words
An apparatus for forming a weld connection with plastic pipe, comprising first and second molded plastic parts, each of said parts having an internal surface corresponding to a peripheral portion of the pipe being welded such that said internal surfaces define a cavity for receiving and enclosing the pipe, said parts being separated by first and second longitudinally extending clearances; and first and second heating mats adjacent said internal surfaces of said first and second parts, respectively, each of said mats having one end portion in one of said clearances and comprising a resistance wire coated with plastic, said mats completely covering said internal surfaces and the pipe periphery to be welded.
Claim 3
Dependent Claim
20 words
An apparatus according to claim 1 wherein said part internal surfaces are semicylindrical and said clearances extend substantially tangentially therefrom.
Claim 4
Dependent Claim
41 words
An apparatus according to claim 1 wherein each of said heating mats is generally U-shaped with two side pieces extending from and connected by a crosspiece, said crosspiece being located in said clearances and said side pieces covering said internal surfaces.
Claim 5
Dependent Claim
23 words
An apparatus according to claim 3 wherein each of said internal surfaces comprises two axially spaced bearing surfaces separated by a semicylindrical recess.
Claim 6
Dependent Claim
27 words
An apparatus according to claim 4 wherein said recesses in said molded parts and spaces between said side pieces of said heating mats define an annular chamber.
Claim 7
Dependent Claim
22 words
An apparatus according to claim 5 wherein said annular chamber receives a packing means for temporarily sealing a leak in the pipe.
Claim 8
Dependent Claim
22 words
An apparatus according to claim 6 wherein said packing means includes a clamping means for pressing said packing means onto the pipe.
Claim 9
Dependent Claim
18 words
An apparatus according to claim 6 wherein said packing means comprises a band of woven reinforced adhesive tape.
Claim 10
Dependent Claim
20 words
An apparatus according to claim 1 wherein said heating mats are secured to said internal surfaces of said molded parts.
Claim 11
Dependent Claim
33 words
An apparatus according to claim 1 wherein said internal surfaces comprises means for receiving two pipes from opposite longitudinal ends of said molded parts such that said apparatus functions as a connecting sleeve.
Claim 12
Dependent Claim
27 words
An apparatus according to claim 1 wherein said first molded part includes branch means for coupling a branch pipe in fluid communication with the pipe being welded.
Claim 13
Dependent Claim
17 words
An apparatus according to claim 1 wherein said first molded part has a transverse bore formed therein.
References Cited (Backward Citations)
US2307148A
Cited
CH396536A
Cited
DE1479231A1
Cited
US3519023A
Cited
DE2242369C3
Cited
US3907625A
Cited
CH528697A
Cited
GB1409224A
Cited
DE2514827A1
Cited
US4147926A
Cited
FR2422896B1
Cited
US4313053A
Cited
US4365144A
Cited
US4362684A
Cited
US4375591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-13 | 1987-09-12 | 1988-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-13 | 1991-09-12 | 1992-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-13 | 1995-09-12 | 1996-03-13 | $7700.00 | Window Closed / Lapsed |