US3854174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sliding clasp fastener
Assignee: YKK Corp
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Filing: 1972-10-02
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Granted: 1974-12-17
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Expires: 1992-10-02
Abstract
Abstract A sliding clasp fastener is disclosed which comprises a pair of opposed carrier tapes each carrying along one and the same longitudinal edge a row of fastener elements interengageable to bring the tapes together in closed disposition by the agency of a slider. The elements are formed from a continuous filament material into a spring coil having a coupling head, upper and lower arms and a base. A reinforcing cord is inserted through the coil element row and intimately contacted therewith so as to prevent their relative movements during normal closing and opening operations of the fastener.
Inventors
- 👤 T Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:48
CPC Classifications
A; A44; A44B; A44B19/00; A44B19/24; A44B19/40; A44B19/406; Y; Y10; Y10T; Y10T24/00; Y10T24/25; Y10T24/2518; Y10T24/2523; Y10T24/2525
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
107 words
In a sliding clasp fastener having a pair of opposed stringer taPes and rows of coupling elements mounted on respective stringer tapes, said coupling elements being formed as parts on a continuous filament helical coil, each element having a coupling head, upper and lower arm portions and a base portion, the improvement which comprises a reinforcing cord extending longitudinally through the coil defining each row of coupling elements, said reinforcing cord having a helical groove disposed for engagement with the coupling elements coil to embed portions thereof in said groove to maintain a pitch spacing among the coupling elements equivalent to the helical pitch of said groove.
Claim 2
Dependent Claim
107 words
In a sliding clasp fastener having a pair of opposed stringer taPes and rows of coupling elements mounted on respective stringer tapes, said coupling elements being formed as parts on a continuous filament helical coil, each element having a coupling head, upper and lower arm portions and a base portion, the improvement which comprises a reinforcing cord extending longitudinally through the coil defining each row of coupling elements, said reinforcing cord having a helical groove disposed for engagement with the coupling elements coil to embed portions thereof in said groove to maintain a pitch spacing among the coupling elements equivalent to the helical pitch of said groove.
Claim 3
Dependent Claim
26 words
The improvement according to claim 1 wherein said groove embeds the base portion and parts of the upper and lower arm portions of said coupling elements.
Claim 4
Dependent Claim
34 words
The improvement according to claim 1 including means defining notches in the upper arm portions of said coupling elements to receive and retain sewing stitches which secure the coupling elements to the stringer tapes.
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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |