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US3666853A
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Method of manufacturing a continuous stringer for a sliding clasp fastener
Assignee: DR KARL F NAGELE FELNMASCHINENBAU
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Filing: 1970-04-30
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Granted: 1972-05-30
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Expires: 1990-04-30
Abstract
Abstract In manufacturing a continuous slide fastener stringer, a plastic wire is coiled into a helix abut a fixed mandrel, and the helix is withdrawn from the mandrel while its convolutions are braked on one side so that the helix is distorted. It is thereafter shaped on a heated spacing wheel, and each convolution is deformed by a toothed kinking disc. The stringer so formed has convolutions of periodically varying inclination and has alternating parallel shanks connected by inclined portions retaining the original coiling pitch and having protuberances which secure loops of sewing threads by means of which the stringer is attached to a supporting tape.
Inventors
- 👤 Ernst Popovitsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 01:47
CPC Classifications
B; B29; B29D; B29D5/00; B29D5/06; A; A44; A44B; A44B19/00; A44B19/10; A44B19/12; Y; Y10; Y10S; Y10S264/00; Y10S264/40; Y10S425/00; Y10S425/814; Y10T; Y10T24/00; Y10T24/25; Y10T24/2518; Y10T24/2525; Y10T29/00; Y10T29/51; Y10T29/5101; Y10T29/53; Y10T29/53291; Y10T29/53304
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
34 words
whereby said helix is given a periodically varying angle of inclination and constitutes an elongated stringer, said second portions constituting stringer elements; d. feeding said stringer from said mandrel to a heated spacing wheel,
Claim 2
Dependent Claim
42 words
A method as set forth in claim 1, wherein said strand is coiled on said mandrel by passing the strand through a thread guide while said thread guide rotates about said mandrel and said mandrel is secured in a heated coiling head.
Claim 3
Dependent Claim
39 words
A method as set forth in claim 1, wherein said second portions of said convolutions are engaged by a reciprocating stamping die with a force sufficient to form a coupling surface on each second portion prior to said withdrawing.
Claim 4
Dependent Claim
35 words
A method as set forth in claim 3, wherein said plastic material is thermoplastic, and said stringer is being cooled after said engaging of each of said first portions between said tooth and said pin.
Claim 5
Dependent Claim
21 words
A method as set forth in claim 4, wherein said pressure is sufficient to form a protuberance on said first portion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |