Auxiliary ventilation system for underground sites

Details Auxiliary ventilation system for underground sites Auxiliary ventilation system for underground sites

1981-10-01

1982-12-07

Makay, Albert J.

Fluid handling

Flow affected by fluid contact, energy field or coanda effect

Means to regulate or vary operation of device

98 33R, 137597, E21F 100

Patent

active

043620922

ABSTRACT:
An auxiliary ventilation system for an underground site comprises an air box through which extend first and second chambers each having inlet and outlet ports and being in communication with one another. Flap members are mounted one in each chamber to be pivotal, about associated axes extending centrally of the flap members and transversely of the chambers, between first positions permitting substantially axial flow through each chamber from its inlet port to its outlet port, and second positions defining a passage through the air box from the inlet port of the first chamber to the inlet port of the second chamber. Means, preferably in the form of a further flap member, are provided which are movable with said flap members to seal the chambers from one another with said flap members in their first positions and to interconnect said chambers with the flap members in their second positions.

REFERENCES:
patent: 720264 (1903-02-01), Lepley
patent: 752955 (1904-02-01), Clifford
patent: 1695784 (1928-12-01), Sternberg
patent: 1695804 (1928-12-01), Feinberg
patent: 1917439 (1933-07-01), Driggs
patent: 2011117 (1935-08-01), Richter
patent: 2214736 (1940-09-01), Carmichael et al.

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