US3915053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fastener with proportioned strength lock grooves
Assignee: Huck Patents Inc
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Filing: 1974-08-26
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Granted: 1975-10-28
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Expires: 1994-08-26
Abstract
Abstract A new fastener having stiffness proportioned and/or strength proportioned lock grooves to enable predetermined load distribution across the lock grooves.
Inventors
- 👤 John Howland Ruhl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:19
CPC Classifications
F; F16; F16B; F16B19/00; F16B19/04; F16B19/05; Y; Y10; Y10S; Y10S411/00; Y10S411/916
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
142 words
A fastener having a head and a shank portion, and a swage collar member fastened thereon for holding workpieces, said fastener having at least three differently proportioned strength locking annular shoulder and groove means for providing a predetermined desired load distribution across the shank portion which is generally coextensive with the collar to the sheet line of the workpiece, said plurality of locking shoulder and groove means being non-uniform in dimensions and wherein, each of said groove means increases in size as distance from the sheet line increases and, said shoulder and groove means provide proportioned stiffness such that the shoulder and groove means fail at approximately the same load to thereby provide the maximum strength for the fastener and being operative to prevent shear stress from being taken up at only a shoulder which is closely adjacent to the sheet line.
Claim 2
Dependent Claim
142 words
A fastener having a head and a shank portion, and a swage collar member fastened thereon for holding workpieces, said fastener having at least three differently proportioned strength locking annular shoulder and groove means for providing a predetermined desired load distribution across the shank portion which is generally coextensive with the collar to the sheet line of the workpiece, said plurality of locking shoulder and groove means being non-uniform in dimensions and wherein, each of said groove means increases in size as distance from the sheet line increases and, said shoulder and groove means provide proportioned stiffness such that the shoulder and groove means fail at approximately the same load to thereby provide the maximum strength for the fastener and being operative to prevent shear stress from being taken up at only a shoulder which is closely adjacent to the sheet line.
Claim 3
Dependent Claim
39 words
The invention of claim 1 wherein, the shoulder and groove shear area between the shank and collar is divided proportionately in relation with their respective strengths to give proportioned stiffness lock grooves across the axial length of the collar.
Claim 4
Dependent Claim
22 words
The invention of claim 1 wherein, the shoulders are tilted toward the workpiece line to increase the effective strength of the fastener.
Claim 5
Dependent Claim
21 words
The invention of claim 1 wherein, each of said shoulder means increases in size as distance from the sheet line increases.
Claim 6
Dependent Claim
37 words
The invention of claim 1 wherein, said fastener includes a shoulder and/or groove shear area relationship that is proportioned in a predetermined desired manner, and said proportioned strength shoulder and groove means are significantly non-uniform in dimension.
Claim 7
Dependent Claim
14 words
The invention of claim 1 wherein, the shank shoulders are designed to fail first.
Claim 8
Dependent Claim
14 words
The invention of claim 1 wherein, the collar shoulders are designed to fail first.
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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |