Electronic click wrench
US10105830B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 18, 2015 |
| Grant date | Oct 23, 2018 |
| Priority date | — |
| Expiry date | Sep 12, 2035 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B23/1425
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An electronic click wrench comprises a handle for applying torque through a shaft to a working head. The shaft includes torque sensing means for calculating the torque applied to a workpiece by the working head, and a trigger mechanism for sending a haptic feedback to a user by triggering a small movement of the handle relative to the working head when a set point torque is reached. The trigger mechanism comprises a permanent magnet that is normally anchored by magnetic attraction to a pole piece so as to resist separation when a force is applied through the handle, and an electromagnetic means actuable to reduce or cancel that magnetic attraction so as to permit separation of the pole piece and permanent magnet, thus generating the haptic feedback. Operation of the electromagnet may oppose the flux of the permanent magnet through the pole piece. Alternatively operation of the electromagnet may divert the flux of the permanent magnet away from the pole piece.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.