Apparatus for monitoring the state of a protective device of a machine
US8228146B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 2007 |
| Grant date | Jul 24, 2012 |
| Priority date | — |
| Expiry date | Feb 3, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2027/005
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus (1) for monitoring the state of a protective device (2) of a machine (4) in particular is a safety switch for monitoring the closed state of a protective door or the like. The apparatus (1) has a switch housing (22) with a switch head (24) and an actuator (8). In the closed state of the protective device (2), the actuator interacts with the switch head (24) and, as a result, the closed state of the protective device (2) can be signaled. The apparatus (1) has a tumbler device (20) with a tumbler element (30) mounted movably in the apparatus (1) and by which the closed state of the protective device (2) can be locked releasably. The tumbler device (20) has at least one permanent magnet (34). By the magnetic force, the tumbler element (30) can be fixed in a first position when the power supply to the apparatus (1) is switched off, in which first position the tumbler device (20) locks the closed state of the protective device (2), and/or can be fixed in a second position, in which the tumbler device (20) does not lock the closed state of the protective device (2).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.