Resources Contact Us Home
Transit car door system and operation

Image Number 12 for United States Patent #5119739.

A computer assisted transit car door operating system for augmented automation of transit car door panel operation while providing safety provisions to restrain rail movement unless all passage doorways are closed. A programmable logic controller generates a sequence initiating (opening or closing) signal for a door panel; or, a manual input signal can be introduced for such purpose. The controller receives signals from a panel position sensor and a panel movement sensor to evaluate door panel status and generate status indication and panel movement signals. Automated control of door panel movement is selectively directed to a doorway, or doorways, at which an opening or closing problem is being encountered; that is, the exclusion of door panel movement signals to properly operated door panels. An electrical cam device utilizes a radiant energy emitter and detector with a reversible-direction, coded attenuator, keyed to a reversible-direction motor drive for a door panel; modulating output of such radiant energy detector indicates direction of movement and other data by coordination with the controller. An electrically controlled power regulator controls connection of a source of DC power to control direction of rotation of a reversible-rotation DC motor controlling opening and closing of door panel.

  Recently Added Patents
Method and system for enterprise search navigation
Front bumper
Method of forming top electrode for capacitor and interconnection in integrated passive device (IPD)
Integrated process for producing polyvinyl alcohol or a copolymer thereof and ethanol
Determination of properties of an electrical device
Fuel cell feed systems
Base transceiver station apparatus and mobile communications system
  Randomly Featured Patents
MRI magnets
Parallel four-bar mechanism
Body member conformable disposable articles
Connector assembly for corrugated coaxial cable
Method for fabricating an integrated circuit device
Radio and/or telephone communication system for a fleet of vehicles
Electric-discharge lamp control apparatus and electric-discharge lamp control method
Fused pyrimidine-dione derivatives as TRPA1 modulators
Tray and dolly assembly
Electrochemical cell and fuel cell using an ionic conductor