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Safety monitoring device with instantaneous speed determination for a lift car

  • US 7,438,158 B2
  • Filed: 01/27/2005
  • Issued: 10/21/2008
  • Est. Priority Date: 02/20/2004
  • Status: Active Grant
First Claim
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1. A safety monitoring device for a lift car which is moveable in a lift shaft by means of a traction drive via a lift control system andwhose instantaneous position is registratable by means of a position registering device which supplies two position signals, produced independently of each other, in a predetermined time pattern, having two-channel evaluation of the position signals by means of a microprocessor in each case for location-dependent, instantaneous determination of the speed of the lift car obtained from the two-channel evaluation of the position signals and for comparison with a predefined movement profile, wherein the two microprocessors communicate with each other via a line for mutual monitoring, in the case a predetermined instantaneous speed desired value is exceeded it being provided to generate a trigger signal outputed via a safety relay stage.

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