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US 5,222,838 AGranted
Power mine door system
AssigneeJack Kennedy Metal Products & Buildings, Inc.
InventorsWilliam R. Kennedy, John M. Kennedy
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AssigneeJack Kennedy Metal Products & Buildings, Inc.
InventorsWilliam R. Kennedy, John M. Kennedy
Estimating the term…
A mine door system including a door frame to be installed in a mine passageway to define a generally rectangular doorway. A mine door is defined by a pair of generally rectangular door leafs which are hinged on the door frame at opposite sides of the doorway for swinging between an open position to permit passage through the doorway and a closed position in which the door leafs are generally coplanar and close the doorway. The door leafs are so dimensioned that there is a substantial vertical gap between the door leafs when they are closed to accommodate convergence of side walls of the passageway. A relatively wide vertical sealing flap is secured to one of the door leafs for overlapping a face of the other door leaf when the door is closed for covering the gap between the door leafs. A power mechanism for opening and closing the door leafs is operable to control the sequence in which the door leafs close so that the door leaf carrying the sealing flap closes after the other door leaf for ensuring that the sealing flap closes against the face of the other door leaf.
A mine door system for installation in a passageway in a mine, comprising a door frame adapted to be installed in the passageway to define a generally rectangular doorway, said door frame having a top and opposite sides, a mine door comprising a pair of door leafs hinged on opposite sides of the door frame for swinging between an open position to permit passage through the doorway and a closed position in which the door leafs are generally coplanar and close the doorway, each door leaf being generally rectangular in shape with a top horizontal edge, a bottom horizontal edge, a generally vertical hinged side edge adjacent a respective side of the door frame, a generally vertical free side edge opposite the hinged side edge, a first leaf face facing away from the top of the door frame when the door leaf is closed, a second leaf face facing toward the top of the door frame when the door leaf is closed, the door leafs being so dimensioned that there is a substantial vertical gap between the door leafs when they are closed to accommodate convergence of side walls of the passageway, a relatively wide vertical sealing member secured to said first face of one of said door leafs adjacent its free side edge and projecting laterally therefrom for overlapping the first face of the other door leaf adjacent its free side edge thereby to cover said gap between the door leafs when the door leafs are closed, said door leafs having upper corner regions relieved to provide notch-like recesses adjacent the gap on opposite sides of the gap extending from the first leaf faces of the door leafs to the second leaf faces of the door leafs, said sealing member having an inclined upper end portion configured so that, when the door leafs are closed, it slopes upwardly through said recesses and said gap for substantially the full depth of the gap from said first face of each door leaf to said second face of each door leaf, said inclined upper end portion terminating in a tip engageable with the top of the door frame when the door leafs are closed thereby to inhibit the passage of air through the gap at a location adjacent the top of the door frame.
A mine door system for installation in a passageway in a mine, comprising a door frame adapted to be installed in the passageway to define a doorway, said door frame comprising a pair of vertical columns at opposite sides of the doorway and a generally horizontal lintel spanning the columns and extending across the top of the doorway, a mine door mounted on said door frame for movement between open and closed positions, said lintel comprising a first horizontal hollow box beam lying generally in the plane of the vertical columns and a second horizontal box beam attached to the first beam at one side of the first beam and generally in the same horizontal plane as the beam so that the second beam does not project substantially above the first beam, thereby minimizing the overall depth of the lintel.
A mine door system for installation in a passageway in a mine, comprising a mine door having a relatively large surface area exposed to the flow of air through the passageway, said door having air seals at its perimeter to inhibit the flow of air therepast, a man opening in the mine door sufficiently large to permit passage of a person therethrough so that a person may pass through the mine door when it is closed, a man door hinged on the mine door for swinging between a closed position for closing the man opening and an open position, a pressure relief opening in the man door, and a pressure relief door mounted on the man door movable between a closed position for closing the pressure relief opening and an open position for relieving pressure against the man door to permit the man door more readily to be swung open to permit passage of a person therethrough.
In a mine door system for installation in a passageway in a mine, comprising a door frame adapted to be installed in the passageway to define a generally rectangular doorway, a mine door comprising at least one door leaf hinged on the door frame for swinging between an open position to permit passage through the doorway and a closed position for closing the doorway, said door leaf being generally rectangular in shape with a top horizontal edge, a bottom horizontal edge, a generally vertical side edge hinged to the door frame, a generally vertical free side edge opposite the hinged side edge, and opposite leaf faces, and electric power means for opening and closing the door leaf, the improvement comprising switch means for controlling the operation of said electric power means, and pressure-sensitive actuator means mounted on at least one face of door leaf, said actuator means being responsive to pressure due, for example, to contact with a person as the door opens or closes, to actuate said switch means to de-energize said electric power means.
Dependencies are inferred from the claim text.