Impact tool
US7918286B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 2009 |
| Grant date | Apr 5, 2011 |
| Priority date | — |
| Expiry date | Jul 4, 2029 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B21/02
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
In an impact tool including a spindle, an anvil, and an impact mechanism having a hammer and a coil spring, a restricting portion is provided at a front surface of a large-diameter portion of the spindle so as to receive a rear end of the coil spring and to restrict an inner diameter of the rear end of the coil spring. A ring-shaped groove is formed at a rear surface of the hammer to receive a front end of the coil spring, in a manner which provides an inner cylindrical portion at a rear side of the hammer. A run-off portion is formed in the restricting portion so as to allow the inner cylindrical portion of the hammer to move thereinto, so that the hammer can move backward for a distance corresponding to a depth of the run-off portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.