Impact tool
US8827003B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 2011 |
| Grant date | Sep 9, 2014 |
| Priority date | — |
| Expiry date | Apr 10, 2033 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B21/023
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
To ensure that a hammer can retract by a sufficient amount without interfering with a washer receiving a rear end of a coil spring, there is disclosed an impact driver having a washer receiving a rear end of a coil spring biasing a hammer of an impact mechanism to an advanced position. The washer is annular with an inner diameter larger than an inner diameter of an annular groove disposed on a rear surface of the hammer, and includes a frontward extended portion disposed at an inner circumference of the washer. Between a carrier portion of the spindle and the washer, there is disposed a positioner that positions the washer coaxially with the spindle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.