Resources Contact Us Home
Mine stopping having a swinging door

Image Number 4 for United States Patent #6164871.

A mine stopping comprising a wall extending across a passageway in a mine to close the passageway. The wall has an opening therein. A door is hinged adjacent the opening for swinging between a closed position in which the door closes the opening to inhibit the passage of air therethrough, a first open position in which the door is moved in one direction away from the closed position, and a second open position in which the door is swung in an opposite direction away from the closed position. The door is movable to either of the first and second open positions when the door is subjected to substantial concussive air pressure thereby to permit concussive air to pass through the opening in both directions.

  Recently Added Patents
System and method for agitation of multiple specimen containers
Electronic component mounting machine and operating instruction method for the same
Hybrid fin field-effect transistor structures and related methods
Pharmaceutical powder compositions
Automatic baroreflex modulation responsive to adverse event
Crowd formation based on wireless context information
Image generation device with optimized dose control
  Randomly Featured Patents
Programmed electronic advance for engines
Liquid average temperature measuring apparatus and method
Plants and seeds of corn variety CV669244
Color processing method and apparatus
Shower head
Preventing the inclusion of a reference to a host cell in a formula
Position control mechanism for a typewriter ribbon cartridge
Process for preparing short chain alkyl aromatic compounds
Gas regulator with leakage-detecting device