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US3855038A
Expired / Lapsed
US
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Method and arrangement for joining the ends of thermoplastic profiles by heat-welding
Assignee: Individual
•
Filing: 1973-02-08
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Granted: 1974-12-17
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Expires: 1993-02-08
Abstract
Abstract The ends of thermoplastic profiles to be joined are placed into contact with a heated element so that the thermoplastic material will be softened. During this softening the outward displacement of the thermoplastic material beyond the outer contour of the respective profile is prevented. Upon softening the ends are moved out of contact with the heated element and are placed into abutment with one another. During the subsequent hardening of the softened material outward displacement beyond the outer contour of the profiles is again prevented.
Inventors
- 👤 O Anschutz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:45
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/02; B29C65/18; B29C65/20; B29C65/2053; B29C65/2061; B29C57/00; B29C66/00; B29C66/004; B29C66/0042; B29C66/0044; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/114; B29C66/1142; B29C66/116; B29C66/1162; B29C66/20; B29C66/24; B29C66/242; B29C66/2424; B29C66/24243; B29C66/24244; B29C66/32; B29C66/324; B29C66/326; B29C66/328; B29C66/3282; B29C66/50; B29C66/51; B29C66/52; B29C66/524; B29C66/5241; B29C66/5243; B29C66/52431; B29C66/70; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/80; B29C66/81; B29C66/812; B29C66/8126; B29C66/81261; B29C66/816; B29C66/8161; B29C66/818; B29C66/8182; B29C66/81821; B29C66/8122; B29K; B29K2101/00; B29K2101/12; B29L; B29L2031/00; B29L2031/001; B29L2031/003; B29L2031/005
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
167 words
An arrangement for joining the ends of thermoplastic workpieces by heat-welding, comprising a heated element having two opposite sides each provided with a recess whose contour corresponds to the exterior contour of the ends to be joined; a welding jig also having two opposite sides and provided with a passage which connects the same and whose contour also corresponds to the exterior contour of the ends to be joined; and operating means for holding the workpieces to be joined and for moving said ends first into the respective recesses and into contact with said heated element so that the thermoplastic material of said ends softens in response to such contact, then retracting the ends from said recesses so that said welding jig may be substituted for said heated element, and thereupon abutting said ends in said passage of said welding jig so that the softened material joins the abutted ends in response to its hardening while said ends are located in said passage of said welding jig.
Claim 2
Dependent Claim
167 words
An arrangement for joining the ends of thermoplastic workpieces by heat-welding, comprising a heated element having two opposite sides each provided with a recess whose contour corresponds to the exterior contour of the ends to be joined; a welding jig also having two opposite sides and provided with a passage which connects the same and whose contour also corresponds to the exterior contour of the ends to be joined; and operating means for holding the workpieces to be joined and for moving said ends first into the respective recesses and into contact with said heated element so that the thermoplastic material of said ends softens in response to such contact, then retracting the ends from said recesses so that said welding jig may be substituted for said heated element, and thereupon abutting said ends in said passage of said welding jig so that the softened material joins the abutted ends in response to its hardening while said ends are located in said passage of said welding jig.
Claim 3
Dependent Claim
41 words
An arrangement as defined in claim 1, said heated element comprising a heated center member, and a pair of plate members each provided with one of said recesses and each movable into and out of contact with said heated center member.
Claim 4
Dependent Claim
31 words
An arrangement as defined in claim 2; and further comprising hinge means connecting said plate members with said center member for hinged displacement into and out of engagement with the same.
Claim 5
Dependent Claim
31 words
An arrangement as defined in claim 2; and further comprising guide means engaging said plate members and guiding them for sliding movement into and out of engagement with said center member.
Claim 6
Dependent Claim
33 words
An arrangement as defined in claim 2, wherein said plate members are at least in part of material having poor thermal conductivity and to which the softened thermoplastic material tends not to adhere.
Claim 7
Dependent Claim
30 words
An arrangement as defined in claim 5, wherein each of said plate members comprises a first plate of said material having poor thermal conductivity, and a juxtaposed second reinforcing plate.
Claim 8
Dependent Claim
39 words
An arrangement as defined in claim 1, each of said recesses having a bottom wall and a circumferential side wall, at least said bottom wall being heated; and further comprising thermally insulating means provided on said circumferential side wall.
Claim 9
Dependent Claim
49 words
An arrangement as defined in claim 1, each of said recesses having a bottom wall and a circumferential side wall, at least said bottom wall being heated and composed of thermally conductive material; and wherein said circumferential side wall is at least in part composed of thermally insulating material.
Claim 10
Dependent Claim
54 words
An arrangement as defined in claim 1, said recesses each having a bottom wall and a circumferential side wall; and further comprising a molding projection extending from the respective bottom wall within the confines of the associated side wall and having a contour corresponding to the interior contour of the ends to be joined.
Claim 11
Dependent Claim
48 words
An arrangement as defined in claim 9, said molding projections each being bounded by a circumferential edge face tapering inwardly and in direction away from the respective bottom wall and having a width which is at least equal to the wall thickness of the ends to be joined.
Claim 12
Dependent Claim
25 words
An arrangement as defined in claim 1, said recesses each having one outer inlet end bounded by an inwardly converging bevelled inner circumferential surface portion.
Claim 13
Dependent Claim
44 words
An arrangement as defined in claim 1, wherein said heated element is mounted for displacement in a plane paralleling its opposite sides to and from a normal rest position; and further comprising biasing means permanently urging said heated element to said normal rest position.
References Cited (Backward Citations)
US2379500A
Cited
US3472721A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |