Enabler of teaching pendant
US7019227B2 · kind B2 · utility
1Cited by
4References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 22, 2001 |
| Grant date | Mar 28, 2006 |
| Priority date | — |
| Expiry date | Dec 3, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2300/028
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a case where a left-hand push-button switch is ON, a second relay RL2 is electrically de-energized to open a normally close contact RL2-1 of the second relay RL2 so that a relay contact circuit RC is opened. If, in this state, a right-hand push-button switch is shifted to a second OFF state, a normally close contact R3-1 of the right-hand push-button switch is opened. Thus, a third relay RL3 is not electrically de-energized and a first and a second circuits are in cutoff until both the right-hand and the left-hand push-button switches are returned to a first OFF state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.