Power tool
US7591326B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 9, 2007 |
| Grant date | Sep 22, 2009 |
| Priority date | — |
| Expiry date | Jan 9, 2027 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25D2250/321
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
It is an object of the invention to provide an effective technique for improving the durability of a torque limiter utilized in a power tool. The object is achieved by a representative power tool comprising a tool bit, a driving mechanism and a torque limiter. The torque limiter includes first and second rotating members, a ball, a pressing member and an elastic member. The second rotating member includes a power transmitting region with a groove continuously formed from a deepest groove part to a shallowest groove part to allow torque transmission and a power transmission interrupted region with a groove shallower than the shallowest groove part of the power transmitting region to interrupts the torque transmission. According to this construction, when the ball is in the power transmitting region, the pressing member contacts the first rotating member and is held in a position in which the biasing force of the elastic member is prevented from acting upon the ball.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.