Power hand tool
US4066133A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 2, 1975 |
| Grant date | Jan 3, 1978 |
| Priority date | — |
| Expiry date | Sep 2, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B23/147
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
To prevent accidents due to high torque of hand tools, such as drills, and the like, which, when the tool bit stalls, may tend to twist the tool handle from the user's hand, a torque measuring element is located on the tool body at the junction of the tool body and the handle and connected to the power supply of the tool to discontinue or interrupt power supply thereto upon sensing of deformation between the tool body and the handle thereof due to excessive strain on said junction; preferably, the handle is joined to the tool body by a section of material of reduced cross-sectional size to accentuate any deformation between the tool handle and the body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.