Mine door system
Number of patents in Portfolio can not be more than 2000
United States of America
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Sep 1, 1992
Grant Date -
N/A
app pub date -
Oct 17, 1990
filing date -
Jun 5, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A mine door system adapted for installation and a passageway in a mine, comprising a door frame adapted to be installed in the passageway and defining a doorway spaced below a ceiling of the passageway and mine doors hingedly mounted on the door frame for movement between open and closed positions. The system further comprises a top panel structure for substantially closing the space between the door frame and the ceiling of the passageway, the top panel structure being readily contractible heightwise of the passageway without loss of its structural integrity to accommodate a convergence of the ceiling and floor of the passageway without any substantial heightwise deformation of the door frame.
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