Tightening method and system
US3939920A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 1974 |
| Grant date | Feb 24, 1976 |
| Priority date | — |
| Expiry date | Sep 19, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/53687
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A tightening method and system for practicing same are disclosed herein for tightening a fastener to a desired axial load. According to the method, torque is applied to the fastener until it is tightened to its yield point and either the torque applied at the yield point or the angular rotation of the fastener at the yield point are determined and are used to determine the axial load acting on the joint assembly and these determined characteristics are used to determine either the torque or angular rotation required to tighten the fastener to the desired load. Thereafter, torque is again applied to the fastener and when the actual torque being applied or actual angular rotation of the fastener substantially equals that required to tighten the fastener to the desired load, the application of torque is discontinued. The tightening system disclosed for practicing the method includes a wrench for applying torque to a fastener and including means for developing a signal representative of the torque applied to or angular rotation of the fastener and means for developing an actuating signal when the fastener has been tightened to its yield point. The actuating signal shuts off the wrench …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.