Motor-driven screwdriver with variable torque setting for equal torques regardless or countertorques by fasteners
US5356350A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 14, 1992 |
| Grant date | Oct 18, 1994 |
| Priority date | — |
| Expiry date | Jul 14, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B23/14
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A motor-driven machine with variable torque setting feature, especially a screwing machine with a torque-controlled switching-off feature, has a shaft which is driven by a motor via a transmission for driving a tool, and a setting ring for presetting a torque at which the shaft is to be disconnected from the transmission and/or the motor will be switched off. In order to enable approximately identical torque curves to be achieved for hard and for soft screwing applications, a clutch with a variable tripping torque is provided whose tripping torque can be adjusted via an indexing ring, which latter can be adjusted together with the setting ring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.