Patent US3849964A successfully refreshed from Google Patents.
US3849964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion blocking fastener
Assignee: Individual
•
Filing: 1973-08-15
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Granted: 1974-11-26
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Expires: 1993-08-15
Abstract
Abstract An angle headed fastener has controlled interference engagement with the work, along the fastener head and shank, when driven into the work, to provide controlled cold working of the work as well as maximum resistance to corrosive fluid access between the fastener and work.
Inventors
- 👤 F Briles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:47
CPC Classifications
F; F16; F16B; F16B33/00; F16B33/008; F16B33/004; F16B35/00; F16B35/04; F16B35/06; F16B5/00; F16B5/02; Y; Y10; Y10T; Y10T403/00; Y10T403/75
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
162 words
In a fastener having an axially extending shank receivable in a work bore and a head receivable in forcible engagement with the work material forming a counterbore, the improvement comprising a. the head having an end face, a first forwardly tapered section located forwardly of said end face and a second forwardly tapered section located forwardly of the first section, the taper angularity of the second section substantially exceeding the taper angularity of the first section, b. the taper angularity of the first section being less than about 10*, and the axial length of the first section being within the range of 0.140 inches to 0.020 inches, c. and including the work wherein said counterbore has first and second tapers receiving the head first and second sections, the counterbore first taper substantially parallel to the taper of the head first section, and there being interference between the head first section and the counterbore first taper of between substantially 0.003 and 0.008 inches.
Claim 2
Dependent Claim
162 words
In a fastener having an axially extending shank receivable in a work bore and a head receivable in forcible engagement with the work material forming a counterbore, the improvement comprising a. the head having an end face, a first forwardly tapered section located forwardly of said end face and a second forwardly tapered section located forwardly of the first section, the taper angularity of the second section substantially exceeding the taper angularity of the first section, b. the taper angularity of the first section being less than about 10*, and the axial length of the first section being within the range of 0.140 inches to 0.020 inches, c. and including the work wherein said counterbore has first and second tapers receiving the head first and second sections, the counterbore first taper substantially parallel to the taper of the head first section, and there being interference between the head first section and the counterbore first taper of between substantially 0.003 and 0.008 inches.
Claim 3
Dependent Claim
18 words
The fastener of claim 1 wherein said taper angularity of the first section is greater than about 4*.
Claim 4
Dependent Claim
34 words
The fastener of claim 1 wherein the fastener shank includes a primary section extending forwardly of the head second section, and a secondary section which is threaded and extends forwardly of the primary section.
Claim 5
Dependent Claim
17 words
The fastener of claim 3 wherein the shank primary section has interference engagement with the work bore.
Claim 6
Dependent Claim
20 words
The fastener of claim 1 wherein the head second section has sealing interference engagement with said work second counterbore taper.
Claim 7
Dependent Claim
22 words
The fastener of claim 1 wherein said end face is substantially flush with a plane defined by the surface of the work.
Claim 8
Dependent Claim
25 words
The fastener of claim 1 wherein said counterbore second taper has initial undeformed angularity which exceeds the forward taper angularity of said head second section.
Claim 9
Dependent Claim
62 words
The fastener of claim 7 wherein the head second section taper fully engages the counterbore second taper which is cold worked to match the angularity of the head second section taper, the outermost extent of the counterbore second taper being cold worked up to 0.004 inch, and the innermost extent of the counterbore second taper being cold worked up to 0.012 inch.
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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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |