Tightening tool and tightening tool management system
US7556103B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 10, 2005 |
| Grant date | Jul 7, 2009 |
| Priority date | — |
| Expiry date | Feb 27, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B23/141
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A fastening tool with a clutch for shutting off transmission of torque, capable of self-diagnosing fastening torque of a screw or the like at low cost without using expensive elements such as a torque sensor, etc. A fastening tool (10) has a motor (13), a main shaft (20) engaging with a screw or the like, and a clutch (14) interposed between the motor (13) and the main shaft (20). The clutch (14) transmits torque from the motor (13) to the main shaft (20) when a load acting on the main shaft (20) is less than a predetermined value, and shuts off torque transmission from the motor (13) to the main shaft (20) when a load acting on the main shaft (20) is equal to or greater than the predetermined value. The fastening tool (10) further has a control unit (60) for controlling the motor (13). The control unit (60) monitors a current flowing to the motor (13) and determines whether fastening torque is normal or not based on a motor current when transmission of torque from the motor (13) to the main shaft (20) is shut off.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.