Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Digital photographing apparatus and control method for evaluating validity of an auto-focus operation
Quantitative oxygen imaging systems and methods using echo-based single point imaging
Computing device with improved user interface for applications
Variants of a family 44 xyloglucanase
Electrical installation arrangement
Visual indicator of online backup
Shield for vacuum circuit breaker
  Randomly Featured Patents
Zoom view finder
Carboxylic acid thickener having improved performance under alkaline conditions
Body warming device
Thermoplastic copolyester elastomer
Process for oxidizing hydrocyanic acid to cyanogen
Insulated conductor with arc propagation resistant properties and method of manufacture
Method and apparatus for ink drop trajectory control
Polyoxyethyleneated non-ionic surface-active agents with two lipophilic chains
High aperture objective lens
Method for treatment of sleep apnea by electrical stimulation