Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Bicycle shifting method
Amplitude-shift-keying (ASK) envelope detector and demodulation circuits
Gearbox housing
Methods, apparatus, and systems for facilitating control communications between disparate devices
Case for electronic device
Substituted bicyclic HCV inhibitors
Process for the preparation of ethylene homopolymers or copolymers in a high-pressure reactor controlled by a model based predictive controller
  Randomly Featured Patents
Integrated on-line and on-site auctioning system including audio and/or video capabilities
Techniques for providing a differential backup from a storage image
Optical package and method of making
Game board and playing pieces
Server evaluation of client-side script
Fail-safe remotely controlled chain stopper with position indicator
Compactor tooth
Continuous reaction/separation method for nucleated growth reactions
Belt fixing system and method therefor
Calibration of an articulating probe head for a coordinate positioning machine