US4436988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spiral bifilar welding sleeve
Assignee: R and G Sloane Manufacturing Co Inc
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Filing: 1982-03-01
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Granted: 1984-03-13
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Expires: 2002-03-01
Abstract
Abstract A bifilar resistance element for use in preparing heating elements used in thermal bonding and the like, wherein two electrically conducting wires are embedded in a thermoplastic sheath which is fusible when sufficient current is passed through the bifilar resistance element. A heating element is prepared by joining the pair of wires in a length of the bifilar resistance element together at one end to form an electrically conductive path and then winding the length into a spiral shape. Two articles of thermoplastic material may be bonded together by placing the heating element in a recess simultaneously adjacent both articles with a pair of leads to the heating element extending externally from the two articles to be bonded, and applying an electrical current so that the thermoplastic sheath and a portion of the adjacent articles themselves are fused, to bond the articles together upon cooling.
Inventors
- 👤 James J. Blumenkranz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:33
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/40; H05B3/54; H05B3/58; B; B29; B29C; B29C65/00; B29C65/02; B29C65/34; B29C65/3404; B29C65/342; B29C65/3432; B29C65/3464; B29C65/3472; B29C65/3476; B29C65/348; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/12; B29C66/122; B29C66/1222; B29C66/1224; B29C66/50; B29C66/51; B29C66/52; B29C66/522; B29C66/5221; B29C66/80; B29C66/82; B29C66/828; B29C66/8286; F; F16; F16L; F16L47/00; F16L47/02; F16L47/03; B29C65/3468; B29C66/70; B29C66/71
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
130 words
A spiral bifilar welding sleeve for positioning between two thermoplastic members to be bonded together, said sleeve comprising; an elongated thermoplastic sheath of generally rectangular cross-section, having a pair of short sides and a pair of long sides; a pair of electrically conductive wires embedded within said sheath in a spaced, generally parallel relationship; and coupling means for electrically coupling said wires together at one end of said sheath, said wires at the other end being adapted for connection to an electrical current source, said sheath being wound into a plurality of turns defining a generally spiral coil with the short sides of adjacent turns being bonded together, said sheath being fusible when electrical current is passed through said wires to bond the thermoplastic members with respect to each other.
Claim 2
Dependent Claim
130 words
A spiral bifilar welding sleeve for positioning between two thermoplastic members to be bonded together, said sleeve comprising; an elongated thermoplastic sheath of generally rectangular cross-section, having a pair of short sides and a pair of long sides; a pair of electrically conductive wires embedded within said sheath in a spaced, generally parallel relationship; and coupling means for electrically coupling said wires together at one end of said sheath, said wires at the other end being adapted for connection to an electrical current source, said sheath being wound into a plurality of turns defining a generally spiral coil with the short sides of adjacent turns being bonded together, said sheath being fusible when electrical current is passed through said wires to bond the thermoplastic members with respect to each other.
Claim 3
Dependent Claim
35 words
The spiral welding sleeve of claim 1, wherein said wires are spaced inwardly respectively from the opposite short sides of said sheath by a distance of about one fourth the length of the long sides.
Claim 4
Dependent Claim
26 words
The spiral welding sleeve of claim 1, wherein said coupling means comprises a metallic tab pressed onto said wires at said one end of said sheath.
Claim 5
Dependent Claim
31 words
The spiral welding sleeve of claim 1, wherein said other end of said sheath is split apart to separate said wires to allow convenient handling for connection to the electrical source.
Claim 6
Dependent Claim
16 words
The spiral welding sleeve of claim 1, wherein said thermoplastic sheath is extruded over said wires.
Claim 7
Dependent Claim
22 words
The spiral welding sleeve of claim 1, wherein said thermoplastic sheath is comprised of the same material as the two thermoplastic members.
Claim 8
Dependent Claim
25 words
The spiral welding sleeve of claim 1, wherein said wires define a plane substantially parallel to the long sides and perpendicular to the short sides.
Claim 9
Dependent Claim
25 words
The spiral welding sleeve of claim 1, wherein each of said wires in adjacent turns of the spiral coil are generally equidistant from each other.
Claim 10
Dependent Claim
19 words
The spiral welding sleeve of claim 1, wherein said sheath is wound into a spiral coil on a mandrel.
Claim 11
Dependent Claim
38 words
The spiral welding sleeve of claim 9, wherein said mandrel is heated on its outside surface such that the short sides of adjacent turns of said sheath are fused to retain said sleeve in a self-sustaining spiral coil.
Claim 12
Dependent Claim
156 words
A spiral bifilar welding sleeve for positioning between two thermoplastic members to be bonded together, said sleeve comprising: an elongated thermoplastic sheath of generally rectangular cross-section, having a pair of short sides and a pair of long sides; a pair of electrically conductive wires embedded within said sheath in a generally parallel relationship, said wires being spaced inwardly respectively from the opposite short sides of said sheath by a distance of about one fourth the length of the long sides; and coupling means for electrically coupling said wires together at one end of said sheath, said wires at the other end being adapted for connection to an electrical current source, said sheath being wound into a plurality of turns defining a generally spiral coil with the short sides of adjacent turns being bonded together, said sheath being fusible when electrical current is passed through said wires to bond the thermoplastic members with respect to each other.
Claim 13
Dependent Claim
156 words
A spiral bifilar welding sleeve for positioning between two thermoplastic members to be bonded together, said sleeve comprising: an elongated thermoplastic sheath of generally rectangular cross-section, having a pair of short sides and a pair of long sides; a pair of electrically conductive wires embedded within said sheath in a generally parallel relationship, said wires being spaced inwardly respectively from the opposite short sides of said sheath by a distance of about one fourth the length of the long sides; and coupling means for electrically coupling said wires together at one end of said sheath, said wires at the other end being adapted for connection to an electrical current source, said sheath being wound into a plurality of turns defining a generally spiral coil with the short sides of adjacent turns being bonded together, said sheath being fusible when electrical current is passed through said wires to bond the thermoplastic members with respect to each other.
Claim 14
Dependent Claim
25 words
The spiral welding sleeve of claim 11, wherein said wires define a plane substantially parallel to the long sides and perpendicular to the short sides.
Claim 15
Dependent Claim
25 words
The spiral welding sleeve of claim 11, wherein each of said wires in adjacent turns of the spiral coil are generally equidistant from each other.
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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) | 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 |