US4861211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite rivet
Assignee: Lockheed Martin Corp
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Filing: 1988-10-17
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Granted: 1989-08-29
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Expires: 2008-10-17
Abstract
Abstract The invention is a composite rivet comprising a tubular preform having a longitudinal axis and an aperture therethrough aligned with the longitudinal axis. The preform further comprises a head portion, a head forming portion and a shear portion therebetween. The preform is composed of filamentary material in a resin matrix with the filamentary material in the head forming portion in a helical pattern about the longitudinal axis. A mandrel is mounted in the aperture with the mandrel having an end extending outward from said head forming portion.
Inventors
- 👤 Richard F. Dunsmore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:18
CPC Classifications
F; F16; F16B; F16B19/00; F16B19/04; F16B19/08; F16B19/10; F16B19/1027; B; B29; B29C; B29C33/00; B29C33/44; B29C33/448; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/16; B29C70/20; B29C70/205; B29K; B29K2071/00; B29K2909/00; B29K2909/02; B29L; B29L2023/00; Y; Y10; Y10S; Y10S411/00; Y10S411/90; Y10S411/901; Y10S411/904; Y10S411/908
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
91 words
A composite rivet comprising: a tubular preform having a longitudinal axis and an aperture therethrough aligned with said longitudinal axis, a head portion, a head forming portion and a shear portion therebetween, said preform composed of filamentary material in a resin matrix with the filamentary material in said shear portion parallel to said longitudinal axis and the filamentary material in said head forming portion in a helical pattern about said longitudinal axis; and a mandrel mounted in said aperture, said mandrel having an end extending outward from said head forming portion.
Claim 2
Dependent Claim
91 words
A composite rivet comprising: a tubular preform having a longitudinal axis and an aperture therethrough aligned with said longitudinal axis, a head portion, a head forming portion and a shear portion therebetween, said preform composed of filamentary material in a resin matrix with the filamentary material in said shear portion parallel to said longitudinal axis and the filamentary material in said head forming portion in a helical pattern about said longitudinal axis; and a mandrel mounted in said aperture, said mandrel having an end extending outward from said head forming portion.
Claim 3
Dependent Claim
33 words
The composite rivet as set forth in claim 1, wherein said filamentary material in said head forming portion is at a helix angle to said longitudinal axis of between 30 to 60 degrees.
Claim 4
Dependent Claim
19 words
The composite rivet as set forth in claim 2, wherein said helix angle is between 40 to 50 degrees.
Claim 5
Dependent Claim
44 words
The composite rivet as set forth in claim 3, wherein the end of said aperture in said head portion includes an enlarged portion and said mandrel includes a corresponding enlarged portion at its opposite end, such that said mandrel cannot pass through said aperture.
Claim 6
Dependent Claim
16 words
The composite rivet as set forth in claim 4, wherein said resin is a thermoplastic resin.
Claim 7
Dependent Claim
18 words
The composite rivet as set forth in claim 5, wherein said mandrel is made of a ceramic material.
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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) | 1992-08-28 | 1993-02-27 | 1993-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-28 | 1997-02-27 | 1997-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-28 | 2001-02-27 | 2001-08-29 | $7700.00 | Window Closed / Lapsed |