Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Picture information coding device and coding method
Isolated nucleic acid molecule encoding an antibody that reduces GDF-8 activity
Barrier layers comprising Ni-inclusive ternary alloys, coated articles including barrier layers, and methods of making the same
Transaction cost recovery queue management
Shower bench
Color imaging device
Virtual links in a routed ethernet mesh network
  Randomly Featured Patents
Control apparatus of electric power steering
Photograph or document holder
Integrated optical biosensor system (IOBS)
Process for improving the drainage of cellulosic pulps by adding carbon dioxide directly into the pulp
Carboxylated naphthalene formaldehyde condensation polymers as dental plaque barriers
Method and apparatus for supplying fuel for a hydrogen-operated vehicle
Power operated valve stem thrust verification test system
Pad including coadhesively adhered sheets
Device for connecting a piece of road equipment, such as drain inlet, to a vertical fixed runoff drainage pipe
Ion implantation system having an energy probe