US3634167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabricating welded branched pipe connections from weldable thermoplastic materials
Assignee: AKATHERM AG A CORP OF SWITZERLAND
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Filing: 1969-10-23
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Granted: 1972-01-11
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Expires: 1989-10-23
Abstract
Abstract There is disclosed a method of fabricating welded branched pipe connections from weldable thermoplastic materials, such as polyethylene, which includes shaping the end of a branch pipe section to the curvature of a main pipe section, simultaneously heating the shaped end of such branch pipe section and an annular zone of the main pipe section to a welding temperature, pressing the heated shaped end into the heated annular zone of the main pipe section to weld the sections and applying pressure to the material of the sections on both the inner and outer sides of the intersection between the branch pipe section and the main pipe section, while precluding spreading of the sections in a direction perpendicular to the direction in which the sections are pressed together so as to deform the material of the heated annular zone of the main pipe section upwardly into the material of the branch pipe section to increase the area of welding contact. There is also disclosed a press tool for use in such method, which includes outer and inner sleeve means spaced to accommodate a branch pipe section and such sleeves having shaped pressure applying end portions, operative to deform the crosssectional welding line of contact into a raised lip or hump to increase the area of welding contact.
Inventors
- 👤 Erich Plontke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:04
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C65/20; B29C65/2053; B29C65/2061; B29C65/2069; B29C65/2076; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/114; B29C66/1142; B29C66/301; B29C66/32; B29C66/324; B29C66/3242; B29C66/50; B29C66/51; B29C66/52; B29C66/522; B29C66/5224; B29C66/52241; B29C66/63; B29C66/80; B29C66/81; B29C66/814; B29C66/8141; B29C66/81411; B29C66/81415; B29C66/81427; B29C66/82; B29C66/826; B29C66/8264; B29C66/83; B29C66/832; B29C66/8322; B29C66/90; B29C66/91; B29C66/919; B29C66/9192; B29C66/91951; B29C66/92; B29C66/929; B29C66/9292; B29C66/92921; B29C2793/00; B29C2793/0045; B29C2793/009; B29C66/70; B29C66/71; B29C66/81421; B29C66/81422; B29L; B29L2023/00; B29L2023/22; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1062; Y10T156/1064
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
207 words
A method of fabricating welded branched pipe connections from weldable thermoplastic material sections, including the steps of shaping one end of a branch pipe section to conform to the surface configuration of a main pipe section, heating said one end of said branch pipe section and an intersection accommodating zone of said main pipe section that is annular in plan, to at least the welding temperature of the material of said sections, pressing said heated shaped end of said branch pipe section into said zone of said main pipe section while preventing collapse of said main pipe section to initially join said sections at an intersection and while the initially joined sections are still in heated condition, applying pressure on the material of the sections in a direction toward said main pipe section on both sides of said branch pipe section while cOnfining said branch pipe section against spreading transversely of its axis and while still preventing collapse of said main pipe section in an amount sufficient to deform the heated material of the main pipe section toward the branch pipe section to form a hump in the cross sectional line of welding contact between the sections so as to enlarge the effective area of welding contact.
Claim 2
Independent Claim
207 words
A method of fabricating welded branched pipe connections from weldable thermoplastic material sections, including the steps of shaping one end of a branch pipe section to conform to the surface configuration of a main pipe section, heating said one end of said branch pipe section and an intersection accommodating zone of said main pipe section that is annular in plan, to at least the welding temperature of the material of said sections, pressing said heated shaped end of said branch pipe section into said zone of said main pipe section while preventing collapse of said main pipe section to initially join said sections at an intersection and while the initially joined sections are still in heated condition, applying pressure on the material of the sections in a direction toward said main pipe section on both sides of said branch pipe section while cOnfining said branch pipe section against spreading transversely of its axis and while still preventing collapse of said main pipe section in an amount sufficient to deform the heated material of the main pipe section toward the branch pipe section to form a hump in the cross sectional line of welding contact between the sections so as to enlarge the effective area of welding contact.
Claim 3
Dependent Claim
27 words
A method as claimed in claim 1 in which pressure is exerted on the sections at the welding line of contact from about 10 to 50 kg./cm.2.
Claim 4
Dependent Claim
25 words
A method as claimed in claim 1 and further including removing that portion of the main pipe section interiorily of the welded branch pipe section.
Claim 5
Dependent Claim
81 words
A method as claimed in claim 1 in which said heating of said one end of said branch pipe section and said zone of said main pipe section comprises pressing said one end of said branch pipe section against a heated surface shaped in conformity with the shape of said main pipe section and pressing a heated surface shaped in conformity with the shape of said one end of said branch pipe section against said zone of said main pipe section.
Claim 6
Dependent Claim
32 words
A method as claimed in claim 4 in which the heating of said one end of said branch pipe section and said zone of said main pipe section are effected substantially simultaneously.
Claim 7
Dependent Claim
32 words
A method as claimed in claim 1 in which the heating of said one end of said branch pipe section and said zone of said main pipe section are effected substantially simultaneously.
Claim 8
Dependent Claim
34 words
A method as claimed in claim 1 in which said material is polyethylene, said heating is of the order of 200* C. and said final pressure is exerted in the order of 100 kg./cm.2.
Claim 9
Dependent Claim
26 words
A method as claimed in claim 1 in which said final pressing is effected without applying pressure on the other end of said branch pipe section.
Claim 10
Dependent Claim
138 words
A press tool for use in fabricating welded branched pipe connections from weldable thermoplastic materials comprising inner and outer sleeve means spaced to accommodate a branch pipe section therebetween, said sleeve means having a length greater than the length of a branch pipe section to be accommodated and terminating in free ends, means connecting said sleeve means together so as to prevent relative turning movement therebetween, the free ends of both said sleeve means being shaped in general conformity with a main pipe section that is to be welded to such a branch pipe section, and the free end of said outer sleeve means having an arcuate, lower, inner surface operative when said sleeve means have a branch pipe section accommodated therein and welded to a main pipe section to exert deforming pressure on said main pipe section.
Claim 11
Dependent Claim
138 words
A press tool for use in fabricating welded branched pipe connections from weldable thermoplastic materials comprising inner and outer sleeve means spaced to accommodate a branch pipe section therebetween, said sleeve means having a length greater than the length of a branch pipe section to be accommodated and terminating in free ends, means connecting said sleeve means together so as to prevent relative turning movement therebetween, the free ends of both said sleeve means being shaped in general conformity with a main pipe section that is to be welded to such a branch pipe section, and the free end of said outer sleeve means having an arcuate, lower, inner surface operative when said sleeve means have a branch pipe section accommodated therein and welded to a main pipe section to exert deforming pressure on said main pipe section.
Claim 12
Dependent Claim
68 words
A press tool as claimed in claim 9 and further including movable latch means carried by said inner sleeve means for cooperation with an inserted branch pipe section, means for connecting said interconnected sleeve means to a press means, and said latch means being movable between one position, preventing inward movement of such an inserted branch pipe section and another position, releasing such an inserted branch pipe section.
Claim 13
Dependent Claim
43 words
A press tool as claimed in claim 10 and further including spring means urging said latch means to one of said positions and axially movable means operative to overcome said spring means to move said latch means to the other of said positions.
References Cited (Backward Citations)
US3013925A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |