Electric actuating device
US4219825A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1978 |
| Grant date | Aug 26, 1980 |
| Priority date | — |
| Expiry date | Jan 31, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04D7/1221
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A printing device for chronocomparators comprising a striker, an ironless cylindrical coil mounted for rotation in an air gap of a magnetic circuit and connected to the striker, the magnetic circuit being formed by a permanent magnet placed inside the coil and an outer part of magnetically permeable material surrounding the coil. The coil is connected through spiral springs to a source of electric control pulses. The spiral springs provide a return force for bringing the coil back to a rest position in the absence of a control pulse. A cylinder with a helical rib is placed to be stricken by the striker and a recording strip is inserted between the striker and the said cylinder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.