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
Water slide
Configuration method and system of complex network and configuration and management module of server resources
Interface circuit
Method and system for simulating wireless networks
Digital video disc player
Medicament delivery device and a method of medicament delivery
Medical injector
  Randomly Featured Patents
Coupled transponder and antenna system and method
Low-profile fastener
Wheel protector
SPECT apparatus
Liquid insulation for equipment
Infant retention member for a stroller
Energy use monitoring system
Simple gamma correction circuit for multimedia
Method and apparatus for providing call admission control in packet networks
Slow forward trick mode playback of recorded video