US3729757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-locking nut
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1972-01-13
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Granted: 1973-05-01
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Expires: 1992-01-13
Abstract
Abstract This is a lock nut which is formed into a generally elliptical configuration or triangular configuration having arcuate walls, is then tapped and the resulting configuration is then further distorted.
Inventors
- 👤 T Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:09
CPC Classifications
B; B21; B21K; B21K1/00; B21K1/64; B21D; B21D53/00; B21D53/24; B21K1/70; B21K1/707; F; F16; F16B; F16B39/00; F16B39/22; F16B39/28; F16B39/284
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A method of forming a self-locking nut comprising: (a) forming a cylindrical barrel from a sheet metal blank; (b) squeezing the barrel over substantially its entire length to distort the same into an intermediate form having a noncircular transverse cross-sectional configuration; (c) tapping the barrel in said intermediate form to provide a continuous thread of constantly varying effective depth along each convolution thereof; and (d) squeezing the barrel a second time to distort the same into a final form having the same basic geometric transverse, cross-sectional configuration as the second form but deviating appreciably further from the original cylindrical configuration than the second form and having a substantially more pronounced variation in effective thread depth than the intermediate form.
Claim 2
Independent Claim
119 words
A method of forming a self-locking nut comprising: (a) forming a cylindrical barrel from a sheet metal blank; (b) squeezing the barrel over substantially its entire length to distort the same into an intermediate form having a noncircular transverse cross-sectional configuration; (c) tapping the barrel in said intermediate form to provide a continuous thread of constantly varying effective depth along each convolution thereof; and (d) squeezing the barrel a second time to distort the same into a final form having the same basic geometric transverse, cross-sectional configuration as the second form but deviating appreciably further from the original cylindrical configuration than the second form and having a substantially more pronounced variation in effective thread depth than the intermediate form.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |