Safety monitoring device with instantaneous speed determination for a lift car
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United States of America Patent
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-
Oct 21, 2008
Grant Date -
Oct 20, 2005
app pub date -
Jan 27, 2005
filing date -
Feb 20, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A safety monitoring device is provided for a lift car which can be moved in a lift shaft by a traction drive via a lift control system and whose instantaneous position can be registered by 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 and for comparison with a predefined movement profile, it being possible for a trigger signal that can be output via a safety relay stage to be generated if a predetermined instantaneous speed desired value is exceeded.
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