Portable ventilation safety device
OwnerJeffrey C. Gabsterinventor
Life of this patent
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Abstract
Ventilation safety apparatus for extending toward a mine face from a supported area includes a collapsible frame supported on the mine floor, the supports for the frame being connected by a beam, and arms extending upwardly when in released position to support a brattice curtain extending from floor to roof of the mine passage. The arms are foldable to lie substantially parallel to the connecting beam for transporting the apparatus. The device is pushed outward beyond the fixed brattice curtain to extend the workable area ahead of the supported mine roof.
Claims16
A portable, collapsible ventilation device for extending longitudinally along a mine passage having a roof and a floor toward a mine face from a supported area into an unsupported area comprising:
- frame means for being easily transported;
- a pair of spaced apart arm means for receiving means for dividing the mine passage, each of said arm means connected to the frame means and pivotable to lie substantially adjacent the frame means in folded position and to stand substantially upright in extended position, whereby the means for dividing the mine passage comprises means for attaching along each of said arm means and said dividing means extends between said upstanding spaced apart arm means and substantially between the mine roof and the mine floor when the arm means are in extended position, one of said spaced apart extended arm means being positioned under the supported area and the other said extended arm means being positioned longitudinally along the mine passage toward the mine face.
Dependencies are inferred from the claim text.