Door for a mine stopping having knife-edge hinges

Details Door for a mine stopping having knife-edge hinges Door for a mine stopping having knife-edge hinges

1980-10-17

1983-02-15

Downey, Kenneth

Movable or removable closures

With means mounting closure for swinging

Pivots on opposed portal members

49402, 292228, E05D 788

Patent

active

043732941

ABSTRACT:
A door for closing a man-door opening in a mine stopping, the door having a pair of knife-edge hinges one at each of the two upper corners of the door for mounting the door to swing about a horizontal axis adjacent the top edge of the man-door opening between open and closed positions. Each hinge comprises a horizontally extending pivot pin and a vertically extending lug comprising a relatively thin metal plate member having a hole therein adapted to receive the pivot pin, whereby the area of engagement between the pivot pin and the lug is relatively small so that corrosion on the hinge at said area of engagement does not inhibit opening of the door.

REFERENCES:
patent: 1701695 (1929-02-01), Paine
patent: 2253398 (1941-08-01), Reifenberg
patent: 4082331 (1978-04-01), Kennedy et al.
patent: 4118894 (1978-10-01), Kennedy et al.

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