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
Systems and methods for providing a video playlist
Data consumption framework for semantic objects
Music composition automation including song structure
System for hot-start amplification via a multiple emulsion
Distributed multicast packet replication with centralized quality of service
Motion blur reduction for LCD video/graphics processors
Method, preprocessor, speech recognition system, and program product for extracting target speech by removing noise
  Randomly Featured Patents
Method for obtaining grape tannin, resulting tannin and uses
Static semiconductor memory device
Method and apparatus for ultrasound imaging of the heart
Polymer blends with improved hydrolytic stability
Continuous flow electrical treatment of flowable food products
Vehicle computer system audio entertainment system
Setting device joint with a rotating wobbler
Personal computer power supply
Method and rolling mill for improving the running-out of a rolled metal strip whose trailing end is moving at rolling speed
Wide band high frequency compatible electrical coaxial cable