Control system for pneumatically-powered door installation
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United States of America Patent
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Oct 10, 2006
Issued Date -
N/A
app pub date -
May 27, 2005
filing date -
Jun 27, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A mine door installation has a frame installed in a mine passageway. At least one door leaf is mounted on the frame for swinging movement between open and closed positions. Movement of the door leaf is powered by a pneumatic actuator. A pneumatically-powered control system may be provided to control the door installation. The pneumatic control system may comprise a calibrated vent to shorten the delay in the response of the door leaf to direction from the control system to stop moving. The pneumatic control system may also comprise a limit valve to prevent the door installation from opening when a second door installation is open, thereby preventing both door installations in an air lock from being open at the same time.
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Cited Art Landscape
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