US4783985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integral rivet and method of making
Assignee: Alcoa Corp
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Filing: 1987-03-09
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Granted: 1988-11-15
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Expires: 2007-03-09
Abstract
Abstract A method of forming an integral rivet in a sheet metal panel by successively coining portions circumscribing a central portion thereof so that the end panel stock is not stretched and a long shanked rivet is produced. The rivet has a relatively thin wall shank and a relatively thick crown which provides sufficient metal for stacking into a rivet head having a wide formable flange.
Inventors
- 👤 Robert L. LaBarge
- 👤 Frank E. Maier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:28
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/38; B21D51/383; B65; B65D; B65D17/00; B65D17/28; B65D17/401; B65D17/4012; B65D17/4014; B65D41/00; B65D41/02; B65D41/16; B65D41/18; B65D47/00; B65D47/04; B65D47/06; B65D47/08; B65D47/0857; B65D47/0876; B65D2251/00; B65D2251/10; B65D2251/1016; B65D2251/105; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49915; Y10T29/49938
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
96 words
A method of forming an integral rivet in a sheet metal panel, comprising the sequential steps of: coining a first annular portion of a metal panel to extrude a portion of metal inwardly and form an upstanding bubble; coining a second portion circumscribing the first portion to extrude additional metal inwardly and form a partial rivet having a larger area in plan than the area in plan of the bubble; coining a third portion circumscribing the partial rivet to extrude additional metal inwardly which increases the height of the partial rivet and forms the integral rivet.
Claim 2
Independent Claim
96 words
A method of forming an integral rivet in a sheet metal panel, comprising the sequential steps of: coining a first annular portion of a metal panel to extrude a portion of metal inwardly and form an upstanding bubble; coining a second portion circumscribing the first portion to extrude additional metal inwardly and form a partial rivet having a larger area in plan than the area in plan of the bubble; coining a third portion circumscribing the partial rivet to extrude additional metal inwardly which increases the height of the partial rivet and forms the integral rivet.
Claim 3
Dependent Claim
47 words
A method of forming an integral rivet as claimed in claim 1 whereby the step of coining the first portion includes extruding a portion of metal outwardly in addition to extruding a portion of metal inwardly and forming an annular upstanding ridge outwardly adjacent the coined area.
Claim 4
Dependent Claim
40 words
A method of forming an integral rivet as claimed in claim 2 whereby the step of coining a second portion includes coining at least a portion of the annular ridge and forming a thickened wall portion circumscribing the partial rivet.
Claim 5
Dependent Claim
26 words
A method of forming an integral rivet as claimed in claim 3 whereby the step of coining a third portion includes coining the thickened wall portion.
Claim 6
Dependent Claim
36 words
A method of forming an integral rivet as claimed in claim 1 which further includes, following the step of coining a third portion, a step of forming a substantially uniform dome-shaped end wall on the rivet.
Claim 7
Dependent Claim
42 words
A method of forming an integral rivet as claimed in claim 1 whereby in the step of coining a first annular portion, such portion is reduced in thickness to a thickness from 0.50 to 0.65 times the thickness of the metal panel.
Claim 8
Dependent Claim
41 words
A method of forming an integral rivet as claimed in claim 1 whereby in the step of coining a second portion, such portion is reduced in thickness to a thickness from 0.52 to 0.68 times the thickness of the metal panel.
Claim 9
Dependent Claim
41 words
A method of forming an integral rivet as claimed in claim 3 whereby in the step of forming the thickened wall portion, such wall portion is formed with a thickness of 1.14 to 1.31 times the thickness of the metal panel.
Claim 10
Dependent Claim
41 words
A method of forming an integral rivet as claimed in claim 1 whereby in the step of coining a third portion, such portion is reduced in thickness from a thickness of 0.44 to 0.57 times the thickness of the metal panel.
Claim 11
Independent Claim
91 words
A method of forming an integral rivet in a sheet metal panel, comprising: coining an annular portion of a metal panel to extrude metal inwardly and outwardly to form a bubble and an annular ridge therearound in the panel; coining a portion of the metal panel circumscribing said bubble; reforming the bubble into a rivet having a larger area in plan than the area in plan of the bubble; and coining a portion of the metal panel circumscribing said rivet to extrude metal inwardly to increase the height of the rivet.
Claim 12
Independent Claim
91 words
A method of forming an integral rivet in a sheet metal panel, comprising: coining an annular portion of a metal panel to extrude metal inwardly and outwardly to form a bubble and an annular ridge therearound in the panel; coining a portion of the metal panel circumscribing said bubble; reforming the bubble into a rivet having a larger area in plan than the area in plan of the bubble; and coining a portion of the metal panel circumscribing said rivet to extrude metal inwardly to increase the height of the rivet.
Claim 13
Dependent Claim
30 words
A method as set forth in claim 10 whereby the step of coining the metal panel circumscribing the upstanding bubble includes coining at least a portion of the annular ridge
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) | 1991-11-15 | 1992-05-16 | 1992-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-15 | 1996-05-16 | 1996-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-15 | 2000-05-16 | 2000-11-15 | $7700.00 | Window Closed / Lapsed |