Patent US4524494A successfully refreshed from Google Patents.
US4524494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detachable fastener
Assignee: Nifco Inc
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Filing: 1983-07-05
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Granted: 1985-06-25
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Expires: 2003-07-05
Abstract
Abstract A detachable fastener comprises a central shank provided at one end thereof with a head portion and at the other end thereof with leg pieces of the shape of legs of an anchor movably connected through respective hinges to the aforementioned other end, and a receiving part adapted to receive external force and formed as connected to the leading ends of the leg pieces projected from the aforementioned other end of the central shank. In this fastener, the receiving part on receiving an external force causes the leg pieces to be bent about the hinges and the free ends of the leg pieces to be converged.
Inventors
- 👤 Youji Sato
- 👤 Nobuaki Omata
- 👤 Sakuzo Shimbara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:22
CPC Classifications
F; F16; F16B; F16B21/00; F16B21/06; F16B21/08; F16B21/082; Y; Y10; Y10S; Y10S411/00; Y10S411/913; Y10T; Y10T24/00; Y10T24/30; Y10T24/309; Y10T24/34; Y10T24/42
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
134 words
A one-piece plastic detachable fastener comprising a central shank provided at one end thereof with a head portion, a pair of elongated diverging leg pieces resiliently connected intermediate their extremities through respective hinges to the other end of said central shank, the diverging ends of said legs forming the trailing ends while the opposite ends form the leading ends, said leading ends extending beyond said other end of said shank and being spaced from each other, and a receiving part adapted to receive an external spreading force and formed as flange means connected to the leading ends of said pair of leg pieces, whereby said receiving part on receiving said external spreading force bends said leg pieces about said hinges and brings the free ends of said pair of leg pieces toward each other.
Claim 2
Dependent Claim
134 words
A one-piece plastic detachable fastener comprising a central shank provided at one end thereof with a head portion, a pair of elongated diverging leg pieces resiliently connected intermediate their extremities through respective hinges to the other end of said central shank, the diverging ends of said legs forming the trailing ends while the opposite ends form the leading ends, said leading ends extending beyond said other end of said shank and being spaced from each other, and a receiving part adapted to receive an external spreading force and formed as flange means connected to the leading ends of said pair of leg pieces, whereby said receiving part on receiving said external spreading force bends said leg pieces about said hinges and brings the free ends of said pair of leg pieces toward each other.
Claim 3
Dependent Claim
33 words
A detachable fastener according to claim 1 wherein said flange means includes flanges extending from at least one of the free ends of said legs toward the other free end of said leg.
Claim 4
Dependent Claim
20 words
A detachable fastener according to claim 2, wherein said external force exerted on said receiving part is a rotational force.
Claim 5
Dependent Claim
60 words
A detachable fastener according to claim 2 wherein said flange means is hingedly interconnected and capable of over-center inversion to effectively spread the leading ends of said legs about their mid-point connection to said central shank, and thereby bring the free ends toward each other whereby said fastener can be removed from the apertured workpiece with which it is associated.
Claim 6
Dependent Claim
20 words
A detachable fastener according to claim 4, wherein said external force exerted on said receiving part is a pressing force.
Claim 7
Dependent Claim
32 words
A detachable fastener according to claim 1, wherein said head portion of said central shank is further provided with an anchor-shaped leg piece on the side thereof opposite from said central shank.
Claim 8
Dependent Claim
31 words
A detachable fastener according to claim 1, wherein said head portion of said central shank is further provided with an engaging head on the side thereof opposite from said central shank.
Claim 9
Dependent Claim
40 words
A detachable fastener according to claim 1 wherein spring means are provided between at least one of said legs and said central shank to provide spring-like resistance against movement of the free ends of said legs toward said central shank.
Claim 10
Dependent Claim
37 words
A detachable fastener according to claim 8 wherein said spring means includes a resilient spring arm extending between at least one of said legs and said shank, fixed to one of them and slidably contacting the other.
Claim 11
Dependent Claim
23 words
A detachable fastener according to claim 9 wherein each of said legs carries a spring arm which contact opposite sides of said shank.
References Cited (Backward Citations)
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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) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |