Elevator safety circuit with safety relay delay

Patent metadata

Field	Value
Publication number	US-8997941-B2
Application number	US-201113293618-A
Country	US
Kind code	B2
Filing date	Nov 10, 2011
Priority date	Nov 11, 2010
Publication date	Apr 7, 2015
Grant date	Apr 7, 2015

Abstract

An elevator safety circuit can be used to decelerate an elevator car during an emergency stop in a controlled manner. The safety circuit includes a series chain of safety contacts having an input connected to a power source and a first safety relay deriving electrical power from an output of the series chain of safety contacts. A delay circuit is arranged between the output of the series chain of safety contacts and the first safety relay. Hence, if any of the safety contacts open to initiate an emergency stop, a process controlled by the operation of the first safety relay is delayed.

First claim

I claim:

1. An elevator safety circuit comprising:
a series chain of safety contacts comprising a power source input;
a first safety relay configured to be energized by electrical power from an output of the series chain of safety contacts;
a delay circuit arranged between the output of the series chain of safety contacts and the first safety relay for continued energizing of the first safety relay for a predetermined time interval after opening of any one of the safety contac…

Assignees

• Abad Juan Carlos
• Inventio Ag

Inventors

• Abad Juan Carlos

Classifications

• B66B13/22 Primary

  Operations & Transport · mapped topic

• B66B1/32 Primary

  Operations & Transport · mapped topic

• B66B5/02

  Operations & Transport · mapped topic