Resources Contact Us Home
Abnormal elevator speed detector

Image Number 2 for United States Patent #4378059.

An abnormal speed detector for an elevator system having an elevator car for servicing a plurality of floors, means for driving the elevator car in response to a speed command and a speed detector for detecting a running speed of the elevator car is disclosed. The abnormal speed detector comprises means for storing a set of speed data indicating a predetermined abnormal speed checking pattern as a function of running time or running distance of the elevator car, means for reading out of the storage means one of the set of speed data corresponding to an instant value of the running time or running position of the elevator car after the start of run, and means for comparing an actual speed of the elevator car with the readout speed data to determine if the speed of the elevator car is normal or not.

  Recently Added Patents
Food safety printer
Fabrication of thin pellicle beam splitters
Power management systems and designs
Selecting modulation and coding scheme in the presence of interference
Case for camera
PC secure video path
Focus detection device and imaging apparatus having the same
  Randomly Featured Patents
Circuit molded structure having bus bars forming internal circuits
Application management for multi application devices
Method of manufacturing a semiconductor device
Process and device for the recuperation of heat from selected ranges of the solar spectrum
Engine accessory belt drive with self-aligning pulley
Method of determining OLED driving signal
Low compliance seal for gas-enhanced wafer cooling in vacuum
Fuel injection pump for internal combustion engines
Nonvolatile memory for storing multivalue data
Chemical modification of poly(bis-aryloxyphosphazene) with amines