Hydraulic and earth engineering – Underground passageway – e.g. – tunnel
Patent
1997-12-29
2000-09-05
Taylor, Dennis L.
Hydraulic and earth engineering
Underground passageway, e.g., tunnel
49501, 49505, 52630, 4051501, 405151, E21D 914, D21F 100
Patent
active
RE0368539
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 door 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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Advertisement for Canton Mine Doors, published prior to Jun. 5, 1988.
Simplex Mine Tmber Jacks, published prior to Jun. 5, 1988.
Drawing of Lee-Norse Company Cab Door, Model No. HH265-3EE60.
Kennedy John M.
Kennedy William R.
Jack Kennedy Metal Products and Buildings Inc.
Taylor Dennis L.
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