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
Alternate source programming
Power semiconductor module
Method for counting and segmenting viral particles in an image
Method and apparatus for supporting delivery, sale and billing of perishable and time-sensitive goods such as newspapers, periodicals and direct marketing and promotional materials
Apparatus and method for efficient transmission of acknowledgements
Editing device and editing method
DFPase enzymes from Aplysia californica
  Randomly Featured Patents
Microprocessor executing multiple register transfer operations with a single instruction with derivation of destination register numbers from source register
Augmented heat transfer method and apparatus
Wet press papermakers felt and method of fabrication
Combined hoop roller and hoop
Device for use with a golf club to pick up objects
Surgical device for treating flat feet, and a corresponding surgical kit
Electrical warning and switching means and system
Lubricant compositions containing dispersant additives
Quick connect tubing connector and method of assembly
Adaptable heat dissipation device for a personal computer