Impulse clock system
US5282180A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1990 |
| Grant date | Jan 25, 1994 |
| Priority date | — |
| Expiry date | Sep 27, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04C13/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A master/secondary clock system of the impulse type consisting of stepper motor driven secondary clocks and a master control unit. At five minutes before a predetermined registration time, for example 6:00, the sensor of each secondary clock movement is activated by a reverse polarity signal from the master control unit and a series of reset pulses are thereafter transmitted to the secondary clocks with each secondary clock stopping as the window in its drive train gear moves into alignment with the emitter and detector of its sensor mechanism. After this five minute pulse reset phase to correct clocks that are five or less minutes fast, the master control unit transmits a rapid pulse train so as to quickly move all of the remaining clocks to the 6:00 position with each clock being halted at the 6:00 position by movement of the window of its gear into alignment with the emitter and detector of the sensor mechanism of that clock. Following the rapid pulse phase to bring all of the clocks into the correct time mode, normal one minute pulsing of the clocks is resumed by the master control unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.