Patent · US Active

Safety switching apparatus

US8212431B2 · kind B2 · utility

0Cited by

4References

28Claims

0Family size

Assignee

Pilz GmbH & Co. KG · DE

Inventors

Thomas Nitsche · Eßlingen, DE
Boris Kaufmann · Stuttgart, DE
Johannes Hopp · Eßlingen, DE
Rolf Dickhoff · Tauberbischofsheim, DE

Key dates

Filing date	Feb 15, 2011
Grant date	Jul 3, 2012
Priority date	—
Expiry date	Feb 26, 2031

Classification

Technology area (CPC H)Electricity
CPC primaryH03K2217/958
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A safety switching apparatus for the failsafe disconnection of an electrical load has a first and a second terminal for supplying a first and a second signal from a signaling device, such as an emergency-off button. The safety switching apparatus also has a first and a second switching element which together produce a redundant output switching signal for disconnecting the load. The first switching element has a first control circuit to which the first signal is supplied. The second switching element has a second control circuit to which the second signal is supplied. The safety switching apparatus further has circuitry providing a first current path, an alternative second current path and at least one further switching element. The at least one further switching element is designed to select either the first or the second current path, depending on a polarity of the second signal, in order to route the second signal to the second control circuit.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.