US4183894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of fasteners using directive heating during stretching
Assignee: Dennison Manufacturing Co
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Filing: 1977-07-18
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Granted: 1980-01-15
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Expires: 1997-07-18
Abstract
Abstract Assemblages of fasteners formed by the molding of connected individual members which are removed from the mold and positioned as entire assemblages in end jaws that neither open nor close and are then separated while the filament portions of the fasteners are subjected to directed heat, desirably in the vicinity of the junctions of the filaments with associated cross bars, in order to controllably and substantially simultaneously stretch filaments completely to the junctions with their associated cross bars while avoiding the danger of having one or more of the simultaneously stretched filaments break because of random stretching effects.
Inventors
- 👤 Joseph R. Paradis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:04
CPC Classifications
B; B29; B29C; B29C55/00; G; G09; G09F; G09F3/00; G09F3/08; G09F3/14; Y; Y10; Y10T; Y10T24/00; Y10T24/46; Y10T24/4691
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
68 words
The method of manufacturing an assemblage of fasteners which comprises the steps of (a) molding the assemblage as a set of connected individual fasteners, each including an end member which is joined by a filament, and (b) stretching the individual fasteners simultaneously while subjecting them to controlled heating at the junctions of their filaments with their end members, with said controlled heating being directed to the filaments simultaneously.
Claim 2
Independent Claim
68 words
The method of manufacturing an assemblage of fasteners which comprises the steps of (a) molding the assemblage as a set of connected individual fasteners, each including an end member which is joined by a filament, and (b) stretching the individual fasteners simultaneously while subjecting them to controlled heating at the junctions of their filaments with their end members, with said controlled heating being directed to the filaments simultaneously.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein each individual filament includes a taper over a portion of its length.
Claim 4
Dependent Claim
37 words
The method of claim 1 wherein the individual fasteners are connected at one end by a common member and the stretching takes place using jaws which grasp said common member and the other end of said fasteners.
Claim 5
Dependent Claim
29 words
The method of claim 1 wherein the individual fasteners are joined at opposite ends by common members and the stretching is accomplished using jaws which grasp said common members.
Claim 6
Dependent Claim
14 words
The method of claim 1 wherein said controlled heating is provided by infrared radiation.
Claim 7
Dependent Claim
69 words
The method of claim 1 wherein the assemblage is fed into a stretching machine with jaws which grip the fasteners at opposite ends and the jaws are separated to take up slack in the fasteners while causing their filaments to become controllably heated, after which the jaws are separated to stretch the filaments simultaneously and are then relaxed to free the assemblage of stretched fasteners and permit their removal.
Claim 8
Dependent Claim
34 words
The method of claim 6 wherein the heat H in BTUs per hour and the time of exposure T in hours of the product HT is below the threshold of melting for the fasteners.
Claim 9
Dependent Claim
32 words
The method of claim 1 wherein said assemblage is formed in a mold with separable parts and the parts are separated to stretch the fasteners while subjecting them to said controlled heat.
Claim 10
Dependent Claim
28 words
The method of claim 1 wherein said controlled heating is directed to the junction of each filament with its cross bar simultaneously for each fastener of said assemblage.
Claim 11
Dependent Claim
21 words
The method of claim 1 wherein the material of the fasteners is a crystalline substance whose molecules are reoriented by stretching.
Claim 12
Dependent Claim
23 words
The method of claim 1 wherein the material is selected from the class consisting of nylon, polyethylene, polypropylene and polyester and acetyl resins.
Claim 13
Dependent Claim
19 words
The method of claim 1 wherein said fasteners are molded from polypropylene material which is resistant to cold stretching.
References Cited (Backward Citations)
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US3577987A
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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) | 1983-01-14 | 1983-07-16 | 1984-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-14 | 1987-07-16 | 1988-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-14 | 1991-07-16 | 1992-01-15 | $7700.00 | Window Closed / Lapsed |