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
Transmitting petroleum well data from a mobile drilling rig
Photoelectric conversion device and solid-state imaging
Whitening agents for cellulosic substrates
Answer bracelet
Dryer bar
Stage drive method and stage unit, exposure apparatus, and device manufacturing method
Semiconductor device and method of manufacturing the same
  Randomly Featured Patents
Combination of drospirenone and an estrogen sulphamate for HRT
Appliance door latch
Catalysts for demetallization treatment of _hydrocarbons supported on sepiolite
Electric control apparatus with an electromechanical latch device
Image data update apparatus
Dry polymer processing system
Quick coupling component with pressure reduction member
Image replication system having focusing means to receive reflected light through lightguide from spatial light modulator
In-situ metalization monitoring using eddy current and optical measurements
Solar heating panel