Impulse wrench
US5492185A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1994 |
| Grant date | Feb 20, 1996 |
| Priority date | — |
| Expiry date | Apr 15, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB25B23/1453
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An impulse wrench comprises a pneumatic rotation motor (12), a hydraulic torque impulse generator (13) provided with an impulse magnitude responsive actuator (17), a linear movement responsive electric signal producing device (25) located at the rear end of the motor (12), a movement transferring push rod (21) extending through an axial bore (22) in the motor rotor (16) and interconnecting the actuator (17) and the signal producing device (25), an electrically activated motive air shut-off valve (31) disposed concentrically with the signal producing device (25), and an external process controlling and monitoring unit (40) connected to the signal producing device (25) and the shut-off valve (31) and arranged to compute and compare received signals with predetermined values and to initiate shut-off of the power supply (31) as a desired tightening condition is reached.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.