Patent US3885613A successfully refreshed from Google Patents.
US3885613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-locking fastener
Assignee: SHELBY UNIVERSAL Corp
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Filing: 1973-02-05
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Granted: 1975-05-27
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Expires: 1993-02-05
Abstract
Abstract A self-locking screw, one form of which is adapted to have root interference with a mating female thread. The root of the screw, on entry, displaces the crest material of the female thread into the voids between the flanks of the mating members. The screw has a swaging flank which, upon withdrawal, forces the displaced material back toward the crest of the female thread, thus reworking the female thread to approximately its original form. In another form of the screw, the swaging flank is adapted to have positive interference with the confronting flank of the female thread upon entry in order to displace the flank material of the female thread to the crest thereof. A raised root forwardly of the swaging flank is adapted to interfere with the reworked female thread crest upon withdrawal. A self-tapping self-locking screw having the swaging flank is also disclosed.
Inventors
- 👤 Robert J Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:59
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: 9
Claim 1
Independent Claim
270 words
A self-locking male member having a generally helical male thread, a female member having a generally helical preformed female thread mating with said male thread, said male thread having in at least a partial convolution adjacent its entering end a swaging flank portion which is modified relative to the corresponding flank portions of convolutions of said male thread more remote from said entering end by being offset toward the flank portion which it confronts and hence spaced therefrom a distance less than the distance between confronting flank portions of said more remote convolutions, said swaging flank portion being offset sufficiently to have positive interference with the opposing flanks of said female thread upon entry of said male member and to displace such opposing flank material toward the crest of said female thread, the root of said male thread in said more remote convolutions and at the base of said swaging flank portion being sufficiently less in diameter prior to assembly than the crest of said female thread that in assembly there is a clearance between said crest of said female thread and said root of said male thread in said more remote convolutions and at the base of said swaging flank portion for the receipt of such displaced material, said male member having a raised root forwardly of said swaging flank portion which is of greater diameter than the root of said male thread in said more remote convolutions and at the base of said swaging flank portion adapted, upon withdrawal of said male member, to swage said displaced female thread material back along the flanks of said female thread.
Claim 2
Dependent Claim
270 words
A self-locking male member having a generally helical male thread, a female member having a generally helical preformed female thread mating with said male thread, said male thread having in at least a partial convolution adjacent its entering end a swaging flank portion which is modified relative to the corresponding flank portions of convolutions of said male thread more remote from said entering end by being offset toward the flank portion which it confronts and hence spaced therefrom a distance less than the distance between confronting flank portions of said more remote convolutions, said swaging flank portion being offset sufficiently to have positive interference with the opposing flanks of said female thread upon entry of said male member and to displace such opposing flank material toward the crest of said female thread, the root of said male thread in said more remote convolutions and at the base of said swaging flank portion being sufficiently less in diameter prior to assembly than the crest of said female thread that in assembly there is a clearance between said crest of said female thread and said root of said male thread in said more remote convolutions and at the base of said swaging flank portion for the receipt of such displaced material, said male member having a raised root forwardly of said swaging flank portion which is of greater diameter than the root of said male thread in said more remote convolutions and at the base of said swaging flank portion adapted, upon withdrawal of said male member, to swage said displaced female thread material back along the flanks of said female thread.
Claim 3
Dependent Claim
183 words
A self-locking screw having a generally helical male thread, said screw being adapted to threadedly engage a female thread initially having a minor diameter greater than the minor diameter of said screw, said screw having in at least a partial convolution adjacent its entering end a swaging flank portion which is modified relative to the corresponding flank portions of convolutions more remote from said entering end by being offset toward the flank portion which it confronts and hence spaced therefrom a distance less than the distance between confronting flank portions of said more remote convolutions, said swaging flank portion being offset sufficiently to have positive interference with the opposing flanks of such female thread upon entry of said screw and to displace such opposing flank material toward the crest of such female thread, said screw having a raised root forwardly of said swaging flank portion which is of greater diameter than the root at the base of said swaging flank portion adapted, upon withdrawal of said screw, to swage material displaced toward the crest of such female thread back along the flanks thereof.
Claim 4
Dependent Claim
183 words
A self-locking screw having a generally helical male thread, said screw being adapted to threadedly engage a female thread initially having a minor diameter greater than the minor diameter of said screw, said screw having in at least a partial convolution adjacent its entering end a swaging flank portion which is modified relative to the corresponding flank portions of convolutions more remote from said entering end by being offset toward the flank portion which it confronts and hence spaced therefrom a distance less than the distance between confronting flank portions of said more remote convolutions, said swaging flank portion being offset sufficiently to have positive interference with the opposing flanks of such female thread upon entry of said screw and to displace such opposing flank material toward the crest of such female thread, said screw having a raised root forwardly of said swaging flank portion which is of greater diameter than the root at the base of said swaging flank portion adapted, upon withdrawal of said screw, to swage material displaced toward the crest of such female thread back along the flanks thereof.
Claim 5
Dependent Claim
214 words
A self-tapping self-locking screw having a generally helical male thread, said screw having interfering convolutions spaced from the entering end formed with an axially inclined truncated root being free of protuberances, said axially inclined root defining portions of maximum and minimum diameter, said screw having an entering end adapted to form a female thread in a cored hole and being self-locking by root interference in said intefering convolutions with the crest of the newly formed female thread, said screw having in at least a partial convolution adjacent its entering end a swaging flank portion along the flank thereof adjacent the inclined root portion of maximum diameter, said swaging flank portion being modified relative to the corresponding flank portions of said interfering convolutions by being offset toward the flank portion which it confronts and hence spaced therefrom a distance less than the distance between confronting flank portions of said interfering convolutions, said swaging flank portion being operative, upon entry of said screw, to form a flank clearance with the female thread for the reception of material displaced from the crest of the female thread by said root inteference, said swaging flank portiOn being operative, upon withdrawal of said screw, to swage the material displaced from the crest of the female thread back toward such crest.
Claim 6
Dependent Claim
214 words
A self-tapping self-locking screw having a generally helical male thread, said screw having interfering convolutions spaced from the entering end formed with an axially inclined truncated root being free of protuberances, said axially inclined root defining portions of maximum and minimum diameter, said screw having an entering end adapted to form a female thread in a cored hole and being self-locking by root interference in said intefering convolutions with the crest of the newly formed female thread, said screw having in at least a partial convolution adjacent its entering end a swaging flank portion along the flank thereof adjacent the inclined root portion of maximum diameter, said swaging flank portion being modified relative to the corresponding flank portions of said interfering convolutions by being offset toward the flank portion which it confronts and hence spaced therefrom a distance less than the distance between confronting flank portions of said interfering convolutions, said swaging flank portion being operative, upon entry of said screw, to form a flank clearance with the female thread for the reception of material displaced from the crest of the female thread by said root inteference, said swaging flank portiOn being operative, upon withdrawal of said screw, to swage the material displaced from the crest of the female thread back toward such crest.
Claim 7
Dependent Claim
20 words
The self-tapping self-locking screw defined in claim 3, wherein said partial convolution is wider between flanks than said interfering convolutions.
Claim 8
Dependent Claim
180 words
A self-tapping self-locking screw having a generally helical male thread, said screw having interfering convolutions spaced from the entering end, said screw having an entering end adapted to form a female thread in a cored hole and being self-locking by root inteference in said interfering convolutions with the crest of the newly formed female thread, said screw having a swaging flank portion in at least a partial convolution adjacent its entering end, said swaging flank portion being modified relative to the corresponding flank portions of said interfering convolutions by being offset toward the flank portion which it confronts and hence spaced therefrom a distance less than the distance between confronting flank portions of said interfering convolutions, said swaging flank portion being operative, upon entry of said screw, to form a flank clearance with the female thread for the reception of material displaced from the crest of the female thread by said root interference, said swaging flank portion being operative, upon withdrawal of said screw, to swage the material displaced from the crest of the female thread back toward such crest.
Claim 9
Dependent Claim
180 words
A self-tapping self-locking screw having a generally helical male thread, said screw having interfering convolutions spaced from the entering end, said screw having an entering end adapted to form a female thread in a cored hole and being self-locking by root inteference in said interfering convolutions with the crest of the newly formed female thread, said screw having a swaging flank portion in at least a partial convolution adjacent its entering end, said swaging flank portion being modified relative to the corresponding flank portions of said interfering convolutions by being offset toward the flank portion which it confronts and hence spaced therefrom a distance less than the distance between confronting flank portions of said interfering convolutions, said swaging flank portion being operative, upon entry of said screw, to form a flank clearance with the female thread for the reception of material displaced from the crest of the female thread by said root interference, said swaging flank portion being operative, upon withdrawal of said screw, to swage the material displaced from the crest of the female thread back toward such crest.
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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |