Safety ensuring apparatus
US5619110A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Mar 27, 1995 |
| Grant date | Apr 8, 1997 |
| Priority date | — |
| Expiry date | Mar 27, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T70/7124
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a safety ensuring apparatus for ensuring the safety of an operator. A mechanical moving part is surrounded by a safety enclosure with a door of the safety enclosure provided with a door lock device constructed such that the door lock device releases a door lock when a current is supplied from outside to excite a solenoid incorporated therein. The apparatus is constructed such that a lock is released when the mechanical moving part is stopped. Moreover, the construction incorporates a moving part monitoring sensor which monitors if the mechanical moving part is stopped. When mechanical moving part is stopped, the moving part monitoring sensor generates, without a negative operation, an output signal of logic value 1 corresponding to a high energy condition, and the solenoid of the door lock device is excited by this output signal. As a result, the lock of the door lock device is released once the mechanical moving part has stopped. Moreover, at the time of a sensor fault, the solenoid is not excited so that the lock of the door lock device is not released. Hence operator safety can be reliably ensured.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.