US3245096A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-locking screw
Assignee: Long-Lok Corp
•
Filing: 1965-03-15
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Granted: 1966-04-12
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Expires: 1985-03-15
Abstract
No abstract record available.
Inventors
- 👤 Thomas L Mckay
- 👤 Robin J Starriett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:53
CPC Classifications
F; F16; F16B; F16B39/00; F16B39/22; F16B39/28; F16B39/30; F16B39/284
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
A METHOD OF FABRICATING A SELF-LOCKING SCREW CHARACTERIZED BY THE STEPS OF: PROVIDING AN AXIAL BORE IN THE LEADING END OF THE SCREW AND FURTHER PROVIDING A COUNTERBOARD AT AN INTERMEDIATE POINT ON THE LENGTH OF THE THREADED PORTION OF THE SCREW TO MAKE THE LEADING END OF THE SCREW TUBULAR WITH AN INNER CIRCUMFERENTIAL SHOULDER FORMING A TRANSITION FROM A GIVEN INSIDE DIAMETER AT THE LEADING END OF THE SCREW TO A LESSER DIAMETER, INSERTING A MANDREL OF SUBSTANTIALLY CIRCULAR CROSS-SECTION INTO THE LEADING END OF THE SCREW AGAINST SAID SHOULDER, THE DIAMETER OF THE MANDREL BEING SLIGHTLY LESS THAN SAID GIVEN DIAMETER BUT GREATER THAN SAID REDUCED DIAMETER, FORCIBLY ADVANCING THE MANDREL INTO THE INTERIOR OF THE SCREW PAST SAID SHOULDER FOR LOCAL EXPANSION OF THE THREADED PORTION OF THE SCREW IN THE REGION OF SAID REDUCED DIAMETER AND CONSEQUENTLY TILTING AT LEAST ONE TURN OF THE SCREW THREAD FOR SELF-LOCKING ACTION OF THE SCREW, AND WITHDRAWING THE MANDREL.
Claim 2
Independent Claim
161 words
A METHOD OF FABRICATING A SELF-LOCKING SCREW CHARACTERIZED BY THE STEPS OF: PROVIDING AN AXIAL BORE IN THE LEADING END OF THE SCREW AND FURTHER PROVIDING A COUNTERBOARD AT AN INTERMEDIATE POINT ON THE LENGTH OF THE THREADED PORTION OF THE SCREW TO MAKE THE LEADING END OF THE SCREW TUBULAR WITH AN INNER CIRCUMFERENTIAL SHOULDER FORMING A TRANSITION FROM A GIVEN INSIDE DIAMETER AT THE LEADING END OF THE SCREW TO A LESSER DIAMETER, INSERTING A MANDREL OF SUBSTANTIALLY CIRCULAR CROSS-SECTION INTO THE LEADING END OF THE SCREW AGAINST SAID SHOULDER, THE DIAMETER OF THE MANDREL BEING SLIGHTLY LESS THAN SAID GIVEN DIAMETER BUT GREATER THAN SAID REDUCED DIAMETER, FORCIBLY ADVANCING THE MANDREL INTO THE INTERIOR OF THE SCREW PAST SAID SHOULDER FOR LOCAL EXPANSION OF THE THREADED PORTION OF THE SCREW IN THE REGION OF SAID REDUCED DIAMETER AND CONSEQUENTLY TILTING AT LEAST ONE TURN OF THE SCREW THREAD FOR SELF-LOCKING ACTION OF THE SCREW, AND WITHDRAWING THE MANDREL.
References Cited (Backward Citations)
US2856617A
Cited
US3145750A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-11 | 1969-10-11 | 1970-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-11 | 1973-10-11 | 1974-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-11 | 1977-10-11 | 1978-04-12 | $7700.00 | Window Closed / Lapsed |