Self-tightening nut
US4812096A · kind A · utility
Inventor
Key dates
| Filing date | Dec 11, 1987 |
| Grant date | Mar 14, 1989 |
| Priority date | — |
| Expiry date | Dec 11, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49863
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fastener device for automatically maintaining a tightening torque on a threaded structural member under stress which would otherwise become loose when the stress is reduced. The device comprises a first nut member, a second nut member axially aligned with the first nut member and a coiled spring connected at its opposite ends between the first and second nut members. When the nut members are threaded to the first and second nut members and the second nut member is turned and held, as by a stop means, torsional energy is stored in the spring and later becomes available to automatically turn and tighten the first nut member, wherever it becomes loose.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.