Hammer drill
US7931095B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 8, 2009 |
| Grant date | Apr 26, 2011 |
| Priority date | — |
| Expiry date | Dec 9, 2029 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25D2250/371
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
In a hammer drill, a coil spring is disposed rearward of a piston cylinder inside a housing so as to press the piston cylinder to an advanced position when the hammer drill operates in a drill mode, and a supporting plate is disposed at a rear end of the piston cylinder. The supporting plate includes a pair of side plates and a base portion connecting front ends of the side plates. The base portion is in contact with a rear surface of the piston cylinder, and rear ends of the side plates are in contact with a front end of the coil spring. Openings provided in the side plates are configured to hold a pin on which a connecting arm is pivoted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.