Shutter device for air conduit or the like

Details Shutter device for air conduit or the like Shutter device for air conduit or the like

1983-02-07

1984-05-22

Cohan, Alan

Fluid handling

Line condition change responsive valves

Direct response valves

137855, 137527, F16K 1503, F16K 1516

Patent

active

044495498

ABSTRACT:
The invention relates to an improved shuttering device for preventing back-flow in air conduits or the like. The device includes an attachment section and a frame section, the latter being provided with a series of elastic lamellae shiftable between blocking and unblocking positions within the frame, the frame having in addition guide plates extending axially of the conduit to prevent transverse currents.

REFERENCES:
patent: 602437 (1898-04-01), Ellithorpe
patent: 1438161 (1922-12-01), Zimmerman
patent: 4064905 (1977-12-01), Nilsson
patent: 4304265 (1981-12-01), Sell

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