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
Method and apparatus for supporting HARQ
High-performance AHCI interface
Over the counter medicinal container with surface ornamentation
System and method for oscillator frequency control
Composite aircraft floor system
Artifact removal in nuclear images
Optical module for a microlithography objective including holding and supporting devices
  Randomly Featured Patents
Nebulizer heater
Turbine shroud assembly and method for assembling a gas turbine engine
Disc player having a plurality of reading means for reading information on a disc
Rear combination lamp for vehicle
Method for secure data exchange between two devices
Mount assembly for a navigation device
Via-filling process
Method of continuously soldering small elements arranged generally in a line by a concentrated radiant energy source
Attachable beverage coaster
Semiconductor device