US3917787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a slide-fastener coupling element
Assignee: Opti Holding AG
•
Filing: 1973-11-16
•
Granted: 1975-11-04
•
Expires: 1993-11-16
Abstract
Abstract An extruded synthetic-resin strand of uniform and homogeneous cross section is fed at a temperature above its glass-transition temperature to the nip of a pair of shaped rolls which have matching die formations that press the strand into a shape with a succession of coupling heads. Thereafter the shaped strand is passed through thermal-treatment chambers wherein it is thermofixed by heating and cooling. A continuous loop of steel wire is passed between the rolls and through the treatment chambers. This wire is imbedded in (pressed into) the strand at the pressing station and is separated from the strand downstream of the treatment chambers so that the wire acts as a support for the strand and serves to free it from the die formations in the pressing rolls.
Inventors
- 👤 Harry Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:56
CPC Classifications
B; B29; B29D; B29D5/00; B29D5/08; B29C; B29C43/00; B29C43/22; B29C43/222; B29C43/224; B29C48/00; B29C48/03; B29C48/05; Y; Y10; Y10S; Y10S425/00; Y10S425/814
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
148 words
A METHOD OF MAKING A SLIDE-FASTENER COUPLING ELEMENT COMPRISING THE STEPS OF: CONTINUOUSLY EXTRUDING A SYNTHETIC-RESIN STRAND OF UNIFORM AND HOMOGENEOUS CROSS-SECTION AT A PLASTIC DEFORMATION TEMPERATURE ABOVE THE PLASTIC-FLOW TEMPERATURE OF THE RESIN AND BELOW THE MELTING POINT THEREOF, PRESSING SAID STRAND WHILE IT IS STILL AT A PLASTIC-DEFORMATION TEMPERATURE AT A PRESSING STATION INTO A SHAPE HAVING COUPLING HEADS PRIOR TO COOLING OF SAID STRAND BELOW SAID PLASTIC FLOW TEMPERATURE, CONTINOUSLY EMBEDDING AN INEXTENSIBLE CONTINOUS ELEMENT OF MATERIAL OTHER THAN THAT OF SAID STRAND AND IN THE FORM OF A SECTION OF A LOOP OF FLEXIBLE ELEMENT INTO SAID SYNTHETIC-RESIN STRAND AT SAID PRESSING STATION CONCURRENTLY WITH THE PRESSING THEREOF INTO SAID SHAPE, THEREAFTER CONTINOUSLY PASSING THE STRAND UNITED WITH SAID ELEMENT THROUGH A TREATMENT STATION DOWNSTREAM OF SAID PRESSING STATION TO HARDEN SAID STRAND, AND THEREAFTER CONTINUOUSLY SEPARATING SAID INEXTENSIBLE ELEMENT FROM SAID SYNTHETIC-RESIN STRAND.
Claim 2
Independent Claim
148 words
A METHOD OF MAKING A SLIDE-FASTENER COUPLING ELEMENT COMPRISING THE STEPS OF: CONTINUOUSLY EXTRUDING A SYNTHETIC-RESIN STRAND OF UNIFORM AND HOMOGENEOUS CROSS-SECTION AT A PLASTIC DEFORMATION TEMPERATURE ABOVE THE PLASTIC-FLOW TEMPERATURE OF THE RESIN AND BELOW THE MELTING POINT THEREOF, PRESSING SAID STRAND WHILE IT IS STILL AT A PLASTIC-DEFORMATION TEMPERATURE AT A PRESSING STATION INTO A SHAPE HAVING COUPLING HEADS PRIOR TO COOLING OF SAID STRAND BELOW SAID PLASTIC FLOW TEMPERATURE, CONTINOUSLY EMBEDDING AN INEXTENSIBLE CONTINOUS ELEMENT OF MATERIAL OTHER THAN THAT OF SAID STRAND AND IN THE FORM OF A SECTION OF A LOOP OF FLEXIBLE ELEMENT INTO SAID SYNTHETIC-RESIN STRAND AT SAID PRESSING STATION CONCURRENTLY WITH THE PRESSING THEREOF INTO SAID SHAPE, THEREAFTER CONTINOUSLY PASSING THE STRAND UNITED WITH SAID ELEMENT THROUGH A TREATMENT STATION DOWNSTREAM OF SAID PRESSING STATION TO HARDEN SAID STRAND, AND THEREAFTER CONTINUOUSLY SEPARATING SAID INEXTENSIBLE ELEMENT FROM SAID SYNTHETIC-RESIN STRAND.
Claim 3
Dependent Claim
17 words
The method defined in claim 1 wherein said strands are heated and cooled in said treatment station.
Claim 4
Dependent Claim
16 words
The method defined in claim 1 wherein said element is an endless loop of metal wire.
Claim 5
Dependent Claim
53 words
The method defined in claim 3 wherein said strand is formed at said pressing station with a continuous weakened zone along a side of the strand, said wire being pressed into said weakened zone and said weakened zone being torn off from the remainder of said strand upon separation of said wire therefrom.
References Cited (Backward Citations)
US3192298A
Cited
US3422648A
Cited
US3354853A
Cited
US3270408A
Cited
US3445915A
Cited
US3590109A
Cited
US3608035A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |