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
Radio communication device and sequence length adjusting method
Circuit and method for generating an AC voltage from a plurality of voltage sources having a temporally variable DC output voltage
Ink, ink jet recording method, ink cartridge, and ink jet recording apparatus
Laminar library screen
Scalable security services for multicast in a router having integrated zone-based firewall
Reliable and accurate usage detection of a software application
Fixing device and image forming apparatus
  Randomly Featured Patents
Method and apparatus for measuring incident light angle relative to level
Data processing system and method thereof
Flat bottom hole drill
Method of forming annular grooves in a ball polishing apparatus
Accordion folding door hanger with detachable coupons
Digital filtering system
IT analysis integration tool and architecture
Multiport high speed communications integrated circuit
Charge amplifier circuit with drift compensation
Isolation and use of fibronectin receptor