Power tool torque overload clutch
US7886841B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 16, 2006 |
| Grant date | Feb 15, 2011 |
| Priority date | — |
| Expiry date | Nov 3, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25D2250/321
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A torque overload clutch for an electrical power tool, such as a percussion hammer drill, is provided. The clutch is accommodated in a cavity in a gear cog. Spring washers are used to urge ball bearings into indentations formed in the base of the cavity. The ball bearings are accommodated in cavities formed in a drive plate which engages with the spindle drive of the power tool. The spring washers are held in position by a circlip or a threaded plate. The threaded plate arrangement provides means for compressing the spring washers with a consistent force across a manufactured batch. A method of manufacturing the clutch is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.