Mine door system including an air pressure relief door

Details Mine door system including an air pressure relief door Mine door system including an air pressure relief door

2005-10-18

2005-10-18

Joyce, Harold (Department: 3749)

Ventilation

Mine

With partition means

C049S067000, C405S144000

Reexamination Certificate

active

06955594

ABSTRACT:
A mine door of the present invention is adapted for installation in a mine passageway and includes a leaf adapted for swinging between a closed position and an open position. The leaf may be mounted in a frame, and a stopping wall may surround the frame. When closed, the leaf is subject to a differential in air pressure involving higher pressure on one of the faces of the leaf than on the other of the faces of the leaf. The leaf, the frame, or the stopping has an opening therein for passage of air therethrough from adjacent the one of the faces of the leaf to adjacent the other of the faces to more nearly equalize the pressure on the faces and thereby facilitate opening the leaf.

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Jack Kennedy Metal Products & Buildings, Inc., Kennedy Power Machine Doors brochure, Jul. 2, 2002 (Copy of Declaration of William R. Kennedy and Form Transmittal Letter verifying publication date).
The American Mine Door Company, Canton Doors . . . for Trucks . . . for Motors . . . Speed up haulage brochure, admitted prior art.

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