Safety shield control device
US4580062A · kind A · utility
30Cited by
6References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 21, 1983 |
| Grant date | Apr 1, 1986 |
| Priority date | — |
| Expiry date | Apr 21, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H36/0046
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An electrical interlock to prevent unauthorized access to potentially hazardous equipment and an associated detection circuit to detect if a safety shield or closure member is open, not securely closed or has been tampered with and to thereupon automatically de-energize the equipment. The detection circuit may comprise a balanced bridge incorporating the electrical interlock into a leg thereof and may also provide a visual or audible indication whenever the bridge is unbalanced thereby indicating an improperly closed safety shield.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.