US4880343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lock nut having lock member of shape memory recovery alloy
Assignee: MATSUMOTO KOKAN Co Ltd 3-20 HIGASHITSUKAGUCHI-CHO 1-CHOME AMAGASAKI-SHI HYOGO-KEN JAPAN
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Filing: 1987-09-30
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Granted: 1989-11-14
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Expires: 2007-09-30
Abstract
Abstract A lock nut comprising a lock member prepared from a shape memory alloy and serving as a backup member for a fastening nut.
Inventors
- 👤 Hisao Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:35
CPC Classifications
F; F16; F16B; F16B39/00; F16B39/02; F16B39/12; F16B2200/00; F16B2200/77; F16B39/22; F16B39/28; F16B39/34; Y; Y10; Y10S; Y10S411/00; Y10S411/909
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
93 words
A lock nut comprising a lock member prepared from an alloy having a shape memory for returning to and retaining said lock member in a locking shape when said lock member is heated to a temperature above ambient temperature, said lock member being formed in said locking shape at ambient temperature and being distorted at said ambient temperature into a shape larger than said locking shape for positioning said locking member at said ambient temperature in locking position before heat is applied to return and retain said locking member in said locking shape.
Claim 2
Dependent Claim
93 words
A lock nut comprising a lock member prepared from an alloy having a shape memory for returning to and retaining said lock member in a locking shape when said lock member is heated to a temperature above ambient temperature, said lock member being formed in said locking shape at ambient temperature and being distorted at said ambient temperature into a shape larger than said locking shape for positioning said locking member at said ambient temperature in locking position before heat is applied to return and retain said locking member in said locking shape.
Claim 3
Dependent Claim
21 words
A lock nut as defined in claim 1 wherein said lock member is fitted in a portion of a conventional nut.
Claim 4
Dependent Claim
22 words
A lock nut as defined in claim 1 wherein said lock member is diametrically contractable for restoring itself to said memory shape.
References Cited (Backward Citations)
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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) | 1992-11-13 | 1993-05-15 | 1993-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-13 | 1997-05-15 | 1997-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-13 | 2001-05-15 | 2001-11-14 | $7700.00 | Window Closed / Lapsed |