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
Asynchronous task execution
Optical sensor and electronic apparatus
Apparatus and method for phase synchronization in radio frequency transmitters
Wafer level packaging structure with large contact area and preparation method thereof
Method and apparatus for automatically controlling gas pressure for a plasma cutter
Stepped delay control of integrated switches
Managing delivery of application server content
  Randomly Featured Patents
Device for mixing a pharmaceutical composition with an other agent
Composite laminate and method of producing a composite laminate
Device for mixing, foaming and dispensing liquids from separate compressed-gas containers
Nucleic acid hairpin probes and uses thereof
Semiconductor integrated circuit device
Reduction of NO.sub.x in flue gas
Increasing power supply noise rejection using linear voltage regulators in an on-chip temperature sensor
Chaise lounge
New guinea impatiens plant named `Kinic`
Lopper