US4102180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slide fastener endurance tester
Assignee: United States Department of the Army
•
Filing: 1977-06-30
•
Granted: 1978-07-25
•
Expires: 1997-06-30
Abstract
Abstract An apparatus and method for testing the mechanical endurance of a slide fener by determining the number of cycles of opening and closing which the slide fastener is capable of undergoing while being subjected to preselected degrees of loading in both the transverse and longitudinal directions before jamming or other malfunctioning occurs.
Inventors
- 👤 Vasant K. Devarakonda
- 👤 John L. Kovar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:03
CPC Classifications
G; G01; G01N; G01N3/00; G01N3/32
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
104 words
In a slide fastener endurance tester comprising means for supporting a slide fastener extended longitudinally and transversely and means for reciprocatingly moving the slider of said slide fastener back and forth along a predetermined portion of the chain of said slide fastener to open and close said slide fastener, the improvement which comprises means for variably and controllably loading said slide fastener transversely thereof and means for variably and controllably loading said slide fastener longitudinally thereof while said slider is being reciprocatingly moved along said chain, and means for counting the number of cycles of said reciprocating movements of said slider along said chain.
Claim 2
Dependent Claim
104 words
In a slide fastener endurance tester comprising means for supporting a slide fastener extended longitudinally and transversely and means for reciprocatingly moving the slider of said slide fastener back and forth along a predetermined portion of the chain of said slide fastener to open and close said slide fastener, the improvement which comprises means for variably and controllably loading said slide fastener transversely thereof and means for variably and controllably loading said slide fastener longitudinally thereof while said slider is being reciprocatingly moved along said chain, and means for counting the number of cycles of said reciprocating movements of said slider along said chain.
Claim 3
Dependent Claim
86 words
A slide fastener endurance tester according to claim 1, wherein said means for variably and controllably loading said slide fastener transversely comprise a plurality of adjustably spring-biased clamps disposed in pairs lengthwise of said slide fastener, each member of a pair of said spring-biased clamps working in opposition to the other member of said pair of said spring-biased clamps so as to maintain said slide fastener transversely loaded to a predetermined degree along a segment of said predetermined portion of the chain of said slide fastener.
Claim 4
Dependent Claim
26 words
A slide fastener endurance tester according to claim 2, wherein there are four of said pairs of adjustably spring-biased clamps disposed lengthwise of said slide fastener.
Claim 5
Dependent Claim
26 words
A slide fastener endurance tester according to claim 3, wherein said means for variably and controllably loading said slide fastener longitudinally comprises a spring loading means.
Claim 6
Dependent Claim
56 words
A slide fastener endurance tester according to claim 4, wherein each of said pairs of adjustably spring-biased clamps has an adjustability from zero to about 5 pounds of transverse loading and said spring loading means for variably and controllably loading said slide fastener longitudinally has an adjustability from zero to about 5 pounds of longitudinal loading.
Claim 7
Dependent Claim
71 words
A slide fastener endurance tester according to claim 5, wherein said means for counting the number of cycles of said reciprocating movements of said slider along said chain is provided with means for stopping said means for reciprocatingly moving said slider back and forth along said predetermined portion of said chain of said slide fastener after a predetermined number of cycles of said reciprocating movements of said slider along said chain.
Claim 8
Dependent Claim
26 words
A slide fastener endurance tester according to claim 1, wherein said means for variably and controllably loading said slide fastener longitudinally comprises a spring loading means.
Claim 9
Dependent Claim
71 words
A slide fastener endurance tester according to claim 1, wherein said means for counting the number of cycles of said reciprocating movements of said slider along said chain is provided with means for stopping said means for reciprocatingly moving said slider back and forth along said predetermined portion of said chain of said slide fastener after a predetermined number of cycles of said reciprocating movements of said slider along said chain.
Claim 10
Independent Claim
83 words
A method of determining the endurance of a slide fastener which comprises the steps of reciprocatingly moving the slider element of said slide fastener back and forth from a closed position to an open position and back to said closed position and continuing said reciprocating movement of said slider element while applying to the chain of said slide fastener known transverse and longitudinal loads and counting the number of complete cycles of the reciprocating movements of said slider until said slide fastener jams.
Claim 11
Independent Claim
83 words
A method of determining the endurance of a slide fastener which comprises the steps of reciprocatingly moving the slider element of said slide fastener back and forth from a closed position to an open position and back to said closed position and continuing said reciprocating movement of said slider element while applying to the chain of said slide fastener known transverse and longitudinal loads and counting the number of complete cycles of the reciprocating movements of said slider until said slide fastener jams.
References Cited (Backward Citations)
US2493782A
Cited
US3199342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-24 | 1982-01-23 | 1982-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-24 | 1986-01-23 | 1986-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-24 | 1990-01-23 | 1990-07-25 | $7700.00 | Window Closed / Lapsed |