Power-driven screwdriver with torque-dependent release clutch
US6173792A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 2, 1999 |
| Grant date | Jan 16, 2001 |
| Priority date | — |
| Expiry date | Sep 2, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B21/00
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A power-driven screwdriver with a torque-dependent release clutch having two clutch halves is disclosed. The screwdriver comprises additional entrainment elements provided on the clutch halves for bridging the release clutch. To this end, a motor-driven drive gear is mounted to rotate freely on a tool drive shaft and is secured against axial displacement on the housing side while a cam ring can be adjusted axially, together with the tool drive shaft, via an adjusting device. The clutch elements are formed on the respectively facing sides of the drive gear and the cam ring, and the entrainment element are likewise formed, as separate elements, on the respectively facing sides of the drive gear and the cam ring. As a result of the adjusting device axial displacement of the tool drive shaft results either in a rigid through drive, where the release clutch is nonfunctional, or in the torque-dependent release of the release clutch, where the entrainment elements are nonfunctional.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.