Apparatus and method for tightening an assembly
US4344216A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 10, 1979 |
| Grant date | Aug 17, 1982 |
| Priority date | — |
| Expiry date | Dec 10, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/53687
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Apparatus and method for tightening assemblies held together by threaded fasteners. The desired tightened condition is achieved by turning the threaded fastener through a precise tightening angle required to induce a predetermined preload in the threaded fastener and calculated from input parameters characteristic of the assembly being tightened and the predetermined preload. The tightening angle is measured from the onset of linearity of the preload-rotation curve for the assembly by sensing the onset of the substantially linear tightening portion of the torque-rotation curve through which the assembly is taken as it is being tightened.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.