US3856065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Locking screw
Assignee: Individual
•
Filing: 1973-01-02
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Granted: 1974-12-24
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Expires: 1993-01-02
Abstract
Abstract A lock screw comprising a threaded shank and integral screwhead provided with a torque-receiving means. A plurality of protuberances are formed integrally on the threaded shank. When the screw is installed in a parent material, the protuberances press against the parent material, locking the screw in place.
Inventors
- 👤 J Gehring
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:20
CPC Classifications
F; F16; F16B; F16B39/00; F16B39/22; F16B39/28; F16B39/30; Y; Y10; Y10S; Y10S411/00; Y10S411/924; Y10S411/929; Y10S411/938
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
151 words
A self-locking screw comprising a threaded shank having an integral screw head with a torque receiving means, said threaded shank comprising an entering section and a locking section, said locking section comprising a plurality of back-tapered protuberances connected to said threaded shank between adjacent thread surfaces, each said protuberance forming an angled surface having a gradually inclined face facing the direction of the screw turn, and a steep sloped face, said protuberances forming locking means running longitudinally to said threaded shank and angularly to said shank threads, each protuberance extending beyond the shank body diameter a distance less than the crest of said threads and defining a substantially U-shaped configuration having a sharp jagged profile with each end portion of each protuberance engaging an adjacent thread surface and extending up the adjacent thread surface a greater distance from the minor diameter of the screw than the center section of the protuberance.
Claim 2
Dependent Claim
151 words
A self-locking screw comprising a threaded shank having an integral screw head with a torque receiving means, said threaded shank comprising an entering section and a locking section, said locking section comprising a plurality of back-tapered protuberances connected to said threaded shank between adjacent thread surfaces, each said protuberance forming an angled surface having a gradually inclined face facing the direction of the screw turn, and a steep sloped face, said protuberances forming locking means running longitudinally to said threaded shank and angularly to said shank threads, each protuberance extending beyond the shank body diameter a distance less than the crest of said threads and defining a substantially U-shaped configuration having a sharp jagged profile with each end portion of each protuberance engaging an adjacent thread surface and extending up the adjacent thread surface a greater distance from the minor diameter of the screw than the center section of the protuberance.
Claim 3
Dependent Claim
21 words
A self-locking screw as claimed in claim 1 wherein said protuberances extend from said shank body not more than 0.006 inches.
Claim 4
Dependent Claim
46 words
A self-locking screw as claimed in claim 1 wherein said protuberances have an interference fit with the mating threads of said shank so that when the protuberances meet with the mating threads the protuberances are smoothed out to remove a substantial portion of the sharp profiles.
Claim 5
Dependent Claim
21 words
A self-locking screw as claimed in claim 1, wherein said shank and plurality of integral protuberances have a ratchet-shaped cross section.
Claim 6
Dependent Claim
19 words
A self-locking screw as claimed in claim 1 wherein said protuberances run parallel to the axis of the screw.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |