Electronically controlled screwdriver with quality check indicator
US4571696A · kind A · utility
22Cited by
6References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 13, 1983 |
| Grant date | Feb 18, 1986 |
| Priority date | — |
| Expiry date | May 13, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49766
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Backwards counters (11,12) are preset with upper and lower limits of the angle through which screws are to be driven, the counters being loaded when a certain value of torque is reached, at which time counting down begins with each increment of rotary angle. When the operation is completed in the usual way after reaching a limit value of torque, the increasing interval between count pulses is detected by a delay circuit (7) and counting is stopped. A logic circuit (15) shows whether the screw connection is satisfactory or whether it is underdriven or overdriven.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.