Patent US3271107A successfully refreshed from Google Patents.
Patent US4286371A successfully refreshed from Google Patents.
US4286371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous curve countersink and rivet head structure for riveted work pieces
Assignee: Boeing Co
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Filing: 1980-03-10
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Granted: 1981-09-01
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Expires: 2000-03-10
Abstract
Abstract A fastening system having a continuously curved countersink section in an aperture through a plurality of workpieces, with a corresponding rivet having a continuously curved head portion substantially congruent to the continuously curved countersink. Rivets equipped with the continuously curved head surfaces taught herein, when mated with a continuously curved countersink, provide sufficient resistance to fastener pull through, cause cold working of the rivet upon insertion of the rivet into the aperture and impose an elastic load upon the workpiece and rivet, strengthening the joint.
Inventors
- 👤 Joseph G. Falcioni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:37
CPC Classifications
B; B21; B21J; B21J15/00; B21J15/02; F; F16; F16B; F16B19/00; F16B19/04; F16B19/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49915; Y10T29/49938; Y10T29/49943
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
105 words
A process for riveting workpieces together comprising the steps of: forming an aperture through said workpieces said aperture including a bore and having a countersink adjacent a first surface of one of said workpieces, said countersink comprising a continuously curved surface extending from said first surface of said workpiece to said bore, said countersink having a concave portion extending from said first surface toward said bore and having a convex portion extending from said concave portion to said bore; placing a rivet blank to said bore and countersink; and upsetting said rivet blank into intimate contact with said countersink to form a structural fluid-tight joint.
Claim 2
Dependent Claim
105 words
A process for riveting workpieces together comprising the steps of: forming an aperture through said workpieces said aperture including a bore and having a countersink adjacent a first surface of one of said workpieces, said countersink comprising a continuously curved surface extending from said first surface of said workpiece to said bore, said countersink having a concave portion extending from said first surface toward said bore and having a convex portion extending from said concave portion to said bore; placing a rivet blank to said bore and countersink; and upsetting said rivet blank into intimate contact with said countersink to form a structural fluid-tight joint.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein said countersink has a contour described by a surface of rotation.
Claim 4
Dependent Claim
32 words
The process of claim 2 wherein said surface of rotation is formed by rotation of a generatrix comprising a continuously curved line about an axis coincident with the axis of said aperture.
Claim 5
Dependent Claim
30 words
The process of claim 2 where said generatrix comprises segments of two circles one of said two circles being tangent to said bore and to the other of said circles.
Claim 6
Dependent Claim
17 words
The process of claim 1 wherein said rivet blank comprises a rivet having a partially preformed head.
Claim 7
Dependent Claim
14 words
The process of claim 1 wherein said rivet blank comprises a substantially cylindrical slug.
Claim 8
Dependent Claim
27 words
The process of claims 1 or 6 wherein both said rivet and the portions of said workpieces adjacent said aperture are cold worked during said upsetting step.
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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) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |