US4450616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of ensuring the tightness of a bolt and a nut
Assignee: UA ASJOMA SEOLO-SHO Ltd
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Filing: 1982-06-29
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Granted: 1984-05-29
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Expires: 2002-06-29
Abstract
Abstract The disclosure relates to a method of insuring the tightness of a fastener including forming a three-dimensional annular member in an austenite phase using a press, cooling the annular member to a temperature lower than the temperature for starting an austenite transformation, fastening the fastener with the annular member to flatten the annular member, and returning the temperature of the annular member to a higher than austenite temperature so that the recovery power of the annular member for returning the annular member to the three-dimensional shape in the austenite phase generates a fastening force for the fastener.
Inventors
- 👤 Kiyoshi Morita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:24
CPC Classifications
B; B23; B23P; B23P19/00; B23P19/04; B23P19/06; B23P19/067; B23P19/068; F; F03; F03G; F03G7/00; F03G7/06; F03G7/061; F03G7/0614; F03G7/0615; F03G7/067; F16; F16B; F16B39/00; F16B39/02; F16B43/00; F16B2200/00; F16B2200/77; Y; Y10; Y10S; Y10S411/00; Y10S411/909; Y10S72/00; Y10S72/70; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
106 words
A method of ensuring the tightness of a fastener comprising: forming a three-dimensional shape memory annular member in an austenite phase using press means; cooling the annular member to a temperature lower than the temperature for starting an austenite transformation for easy deformation; fastening the fastener with the annular member using a lower-than-conventional torque to a degree which flattens the annular member; and returning the temperature of the annular member to higher than an austenite transformation temperature, so that the recovery power of the annular member for returning the annular member to the three-dimensional shape in the austenite phase generates a fastening force for the fastener.
Claim 2
Independent Claim
106 words
A method of ensuring the tightness of a fastener comprising: forming a three-dimensional shape memory annular member in an austenite phase using press means; cooling the annular member to a temperature lower than the temperature for starting an austenite transformation for easy deformation; fastening the fastener with the annular member using a lower-than-conventional torque to a degree which flattens the annular member; and returning the temperature of the annular member to higher than an austenite transformation temperature, so that the recovery power of the annular member for returning the annular member to the three-dimensional shape in the austenite phase generates a fastening force for the fastener.
Claim 3
Dependent Claim
14 words
The method of claim 1, wherein said fastener comprises a bolt and a nut.
References Cited (Backward Citations)
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JPS529757A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-29 | 1987-11-28 | 1988-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-29 | 1991-11-28 | 1992-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-29 | 1995-11-28 | 1996-05-29 | $7700.00 | Window Closed / Lapsed |