Patent US3554258A successfully refreshed from Google Patents.
US3554258A
Expired / Lapsed
US
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Self-locking threaded element
Assignee: Michigan National Bank of Detroit
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Filing: 1969-05-02
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Granted: 1971-01-12
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Expires: 1989-05-02
Abstract
Abstract A self-locking threaded element to give low but consistent resistance to displacement including a resin deposit on the threaded surface with spaced portions of greater thickness than intervening portions. The resin deposit may be formed by directing a stream of fine particles of heat softenable resin against a threaded surface portion of a heated metallic element under controlled conditions. Resin particles contacting the heated surface are caught and fused as a deposit of the desired contour and the resin is then hardened by cooling.
Inventors
- 👤 Richard J Duffy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:35
CPC Classifications
F; F16; F16B; F16B39/00; F16B39/22; F16B39/28; F16B39/34; F16B33/00; F16B33/06; Y; Y10; Y10S; Y10S411/00; Y10S411/924; Y10S411/947
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
122 words
A self-locking threaded fastener element with low but consistent resistance to displacement from threaded engagement with a complementary element, said fastener element including normally hard, tough, resilient, heat softenable resin adhered on a selected area of the normal thread surface of said fastener element characterized in that the adhered resin is in the form of spaced mounds of resin in the valleys between the threads of said threaded element with the spaces between mounds in a given valley being free from resin or having less radial thickness of resin than the radial thickness of said mounds of resin, the radial thickness of said mounds of resin being at least 75 percent of the maximum clearance of the thread system to be locked.
Claim 2
Dependent Claim
122 words
A self-locking threaded fastener element with low but consistent resistance to displacement from threaded engagement with a complementary element, said fastener element including normally hard, tough, resilient, heat softenable resin adhered on a selected area of the normal thread surface of said fastener element characterized in that the adhered resin is in the form of spaced mounds of resin in the valleys between the threads of said threaded element with the spaces between mounds in a given valley being free from resin or having less radial thickness of resin than the radial thickness of said mounds of resin, the radial thickness of said mounds of resin being at least 75 percent of the maximum clearance of the thread system to be locked.
Claim 3
Dependent Claim
41 words
A self-locking threaded fastener element as defined in claim 1 in which the radial thickness of said mounds of resin is from about 75 percent to about 150 percent of the maximum clearance of the class of thread member being treated.
Claim 4
Dependent Claim
25 words
A self-locking threaded fastener element as defined in claim 2 in which a resin primer coat is disposed between the threaded surface and the resin.
Claim 5
Dependent Claim
41 words
A self-locking threaded fastener element as defined in claim 3 in which the total resin in a given valley if distributed in uniform thickness Would have a thickness less than the maximum clearance of the class of thread member being treated.
References Cited (Backward Citations)
GB690770A
Cited
US3061455A
Cited
US3294139A
Cited
US3389010A
Cited
US3239403A
Cited
US3464473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |