Nut and bolt tightening method and tightening device
US11819964B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 8, 2019 |
| Grant date | Nov 21, 2023 |
| Priority date | — |
| Expiry date | Oct 16, 2040 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B29/02
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Provided is a nut and a bolt tightening method for fastening an object, wherein a tightening force is applied on the object by rotating a nut or a bolt in a state in which a predetermined tension force is applied on the bolt in the axial direction of the bolt. When the tensile force exerted on the bolt decreases as the tightening force increases and after a timing when an inflection point occurs in a time course change in a ratio of an amount of change in the tensile force exerted on the bolt to an amount of change in an angle of rotation of the nut or the bolt, the tightening resulting from the rotation of the nut or bolt is terminated and the tensile force applied on the bolt is removed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.