Rotary hammer
US11571796B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 4, 2019 |
| Grant date | Feb 7, 2023 |
| Priority date | — |
| Expiry date | Jun 20, 2040 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25D2250/331
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A rotary hammer is adapted to impart axial impacts to a tool bit. The rotary hammer comprises a housing, a motor supported by the housing, a gearcase, and a spindle housed in the gearcase and coupled to the motor for receiving torque from the motor, causing the spindle to rotate. The rotary hammer also comprises a reciprocating impact mechanism operable to create a variable pressure air spring within the spindle. The rotary hammer also comprises a vibration damping mechanism including a base on the gearcase, a counterweight circumscribing the base, and a first spring arranged between the base and the counterweight and defining a first biasing axis that is parallel to the reciprocation axis. The vibration damping mechanism also includes a second spring arranged between the base and the counterweight and arranged along the first biasing axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.