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
Insulin derivative
Image-monitoring method for electroporation treatment and as associated image-monitoring appliance
Vehicle wheel rim protector
Printed circuit board including electromagnetic bandgap structure
Stabilization of dicarbonate diesters with protonic acids
Selective high frequency spinal cord modulation for inhibiting pain with reduced side effects, and associated systems and methods
Lubricant composition and antioxident composition
  Randomly Featured Patents
Method and system for providing a linear signal from a mass airflow and/or liquid flow transducer
Techniques for supporting operating systems for portable computers
Pop-up fountains
Dog teaching lead
3-(3-aryloxyphenyl)-1-(substituted methyl-s-triazine-2,4,6-oxo or thiotrione herbicidal agents
Photometry device of camera
Whole blood analytical element and method of analyzing whole blood using the same
Method for fabricating optical devices with defectless and antireflecting spot size converter
Automobile bumper
Holder for air freshener or the like