Periscope blackout blind construction

Details Periscope blackout blind construction Periscope blackout blind construction

1977-10-11

1979-03-20

Evans, F. L.

350 65, G02B 508

Patent

active

041451198

ABSTRACT:
A blackout blind is movably mounted within a periscope of an armor vehicle for covering the eyepiece viewing opening when not in use to prevent interior light from being emitted through the periscope and revealing the location of the vehicle. A transparent block of optical plastic material is mounted within a protective housing which extends through an opening in the vehicle armor. A viewing opening is formed in the housing portion located within the vehicle for observing an exterior field of view. A chamber and guide channels are formed within the housing by a space provided between the plastic block and housing walls and by a frame which extends along certain edges of the viewing opening. A blackout blind is slidably mounted and retained within this chamber and guide channels and is movable across the viewing opening between open and closed positions. The blind preferably is formed of an opaque polycarbonate sheet material which enables the blind to move through severe radius sizes when concealed within the housing without cracking, sticking or taking a set under severe weather and operating conditions.

REFERENCES:
patent: 2130006 (1938-09-01), Gundlach
patent: 4033677 (1977-07-01), Tausch

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