US4221041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semi-tubular rivets and method of using
Assignee: Boeing Commercial Airplane Co
•
Filing: 1978-10-02
•
Granted: 1980-09-09
•
Expires: 1998-10-02
Abstract
Abstract A rivet for joining fiber reinforced plastic laminates has an alloy of titanium columbium. The rivet is semi-tubular in shape. The tubular portion is shaped with an outwardly tapered inner wall to provide for expansion of the tubular section without expanding the balance of the shank.
Inventors
- 👤 Gerhart Hufnagl
- 👤 Clark R. Zehnder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:08
CPC Classifications
B; B29; B29C; B29C65/00; B29C65/56; B29C65/60; B29C65/601; B21; B21J; B21J15/00; B21J15/02; B29C66/00; B29C66/40; B29C66/41; B29C66/43; B29C66/70; B29C66/72; B29C66/721; B29C66/80; B29C66/81; B29C66/814; B29C66/8141; B29C66/81427; B29C66/81429; B29C66/83; B29C66/832; B29C66/8322; B29C66/83221; F; F16; F16B; F16B19/00; F16B19/04; F16B19/08; F16B19/10; B29C65/602; B29C66/71; B29C66/7212; B29K; B29K2105/00; B29K2105/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49915; Y10T29/4992; Y10T29/49938; Y10T29/49943; Y10T29/49947; Y10T29/49954; Y10T29/49956; Y10T29/49957; Y10T29/49972; Y10T403/00; Y10T403/49
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
79 words
A rivet comprising: a titanium columbium alloy, a head, a shank sized to give a net to a clearance fit in a plastic part to be joined and having a concentric opening extending part way inward to form a tubular end to the shank, and the inside wall of the tubular end tapers outward at an angle of about 15 degrees to permit a button to be formed on the tubular end without expanding the shank of the rivet.
Claim 2
Dependent Claim
79 words
A rivet comprising: a titanium columbium alloy, a head, a shank sized to give a net to a clearance fit in a plastic part to be joined and having a concentric opening extending part way inward to form a tubular end to the shank, and the inside wall of the tubular end tapers outward at an angle of about 15 degrees to permit a button to be formed on the tubular end without expanding the shank of the rivet.
Claim 3
Dependent Claim
17 words
A rivet as in claim 1 wherein the rivet comprises about 55% titanium and about 45% columbium.
Claim 4
Dependent Claim
99 words
A rivet, that when formed joins laminates containing reinforced plastic with a double flush head and without the rivet expanding against the bore of the reinforced plastic, the rivet comprises: an alloy of about 55% titanium and about 45% columbium, a manufactured flush head, a constant diameter shank having an open end with tubular walls along part of its length, and the inside wall tapers outward at an angle of about 15 degrees to permit the end of the shank to be deformed outward to fill a countersink area without exerting outward pressure throughout the balance of the shank.
Claim 5
Dependent Claim
99 words
A rivet, that when formed joins laminates containing reinforced plastic with a double flush head and without the rivet expanding against the bore of the reinforced plastic, the rivet comprises: an alloy of about 55% titanium and about 45% columbium, a manufactured flush head, a constant diameter shank having an open end with tubular walls along part of its length, and the inside wall tapers outward at an angle of about 15 degrees to permit the end of the shank to be deformed outward to fill a countersink area without exerting outward pressure throughout the balance of the shank.
Claim 6
Independent Claim
135 words
A method of joining parts at least one of which is a fiber reinforced plastic laminate, the steps comprising: drilling a hole through parts to be joined and countersinking on at least one side, selecting a semi-tubular rivet of titanium columbium alloy having a head and having an inside wall on the tubular portion that tapers outwardly at about 15 degrees, inserting the rivet with a net to a clearance fit in the hole in the parts, insuring that the open end of the tubular rivet is on the countersink side, placing a die on the open end with said die tapered at an angle greater than the angle of the countersink, and squeezing the rivet at a pressure sufficient to set the rivet by forming the open end of the rivet against the countersink.
Claim 7
Independent Claim
135 words
A method of joining parts at least one of which is a fiber reinforced plastic laminate, the steps comprising: drilling a hole through parts to be joined and countersinking on at least one side, selecting a semi-tubular rivet of titanium columbium alloy having a head and having an inside wall on the tubular portion that tapers outwardly at about 15 degrees, inserting the rivet with a net to a clearance fit in the hole in the parts, insuring that the open end of the tubular rivet is on the countersink side, placing a die on the open end with said die tapered at an angle greater than the angle of the countersink, and squeezing the rivet at a pressure sufficient to set the rivet by forming the open end of the rivet against the countersink.
Claim 8
Dependent Claim
32 words
A method of joining parts as in claim 4 further comprising: cutting the countersink at an angle of 100° , and using an angle of about 130° on the rivet forming die.
References Cited (Backward Citations)
US2289221A
Cited
GB687574A
Cited
NL78019C
Cited
US2724614A
Cited
US2993673A
Cited
US3767018A
Cited
US3921777A
Cited
US4007540A
Cited
US4022310A
Cited
US4146118A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-09 | 1984-03-10 | 1984-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-09 | 1988-03-10 | 1988-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-09 | 1992-03-10 | 1992-09-09 | $7700.00 | Window Closed / Lapsed |