US4375591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic welding sleeve
Assignee: Individual
•
Filing: 1981-08-17
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Granted: 1983-03-01
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Expires: 2001-08-17
Abstract
Abstract A welding sleeve has an inner body with a grooved outer surface, a surrounding outer body and a resistance heating wire therebetween. The inner wall, between the bottoms of the grooves and inner surface of the inner body, increases in thickness toward the axial center of the sleeve. During welding, the center of the sleeve and the adjacent axial ends of the parts to be joined are heated later than the axial ends of the sleeve, thereby increasing the stability of the joint formed. Also, disclosed are improved mold assemblies for forming the welding sleeve.
Inventors
- 👤 Werner Sturm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:56
CPC Classifications
F; F16; F16L; F16L47/00; F16L47/02; F16L47/03; B; B29; B29C; B29C65/00; B29C65/02; B29C65/34; B29C65/3404; B29C65/342; B29C65/3428; B29C65/3472; B29C65/3476; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/12; B29C66/122; B29C66/1222; B29C66/1224; B29C66/347; B29C66/3472; B29C66/50; B29C66/51; B29C66/52; B29C66/522; B29C66/5221; B29C66/5229; B29C66/52291; B29C66/52292; B29C66/90; B29C66/91; B29C66/914; B29C66/9161; B29C66/91651; B29C65/3468; B29C66/70; B29C66/71
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
90 words
A welding sleeve for joining thermoplastic line members, comprising: an inner body of thermoplastic material extending along an axis, having an outer surface with grooves separated by webs and having an inner surface, said inner body having a wall thickness between bottoms of said grooves and said inner surface which increases toward an axial center of said inner body; a resistence heating wire received in said groove at said bottoms thereof; and an outer body of thermoplastic material surrounding said inner body and said wire and extending into said grooves.
Claim 2
Dependent Claim
90 words
A welding sleeve for joining thermoplastic line members, comprising: an inner body of thermoplastic material extending along an axis, having an outer surface with grooves separated by webs and having an inner surface, said inner body having a wall thickness between bottoms of said grooves and said inner surface which increases toward an axial center of said inner body; a resistence heating wire received in said groove at said bottoms thereof; and an outer body of thermoplastic material surrounding said inner body and said wire and extending into said grooves.
Claim 3
Dependent Claim
25 words
A welding sleeve according to claim 1, wherein said wall thickness increases in a gradual progression forming a slope of about 5° to about 15°.
Claim 4
Dependent Claim
17 words
A welding sleeve according to claim 1, wherein said grooves decreases in depth toward said axial center.
Claim 5
Dependent Claim
14 words
A welding sleeve according to claim 3, wherein said inner surface is substantially cylindrical.
Claim 6
Dependent Claim
23 words
A welding sleeve according to claim 1, wherein said grooves have a constant depth and said inner surface tapers toward said axial center.
Claim 7
Dependent Claim
32 words
A welding sleeve according to claim 1, wherein said grooves adjacent axial ends of said inner body are of constant depth and said grooves therebetween decrease in depth toward said axial center.
Claim 8
Dependent Claim
22 words
A welding sleeve according to claim 1, wherein said webs have outer edges equally spaced from said axis of said inner part.
Claim 9
Dependent Claim
20 words
A welding sleeve according to claim 7, wherein said web outer edges define an external diameter of said inner body.
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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) | 1986-02-28 | 1986-08-30 | 1987-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-28 | 1990-08-30 | 1991-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-28 | 1994-08-30 | 1995-03-01 | $7700.00 | Window Closed / Lapsed |