Door viewer with barrel flange and mating lens recess

Details Door viewer with barrel flange and mating lens recess Door viewer with barrel flange and mating lens recess

1977-09-13

1979-11-27

Henry, Jon W.

350 69, 350257, G02B 2300

Patent

active

041758242

ABSTRACT:
Disclosed are alternative embodiments of a barrel type optical viewer for installation in a door or other type partition where the wide angle lens of the viewer is so connected with the forward barrel flange to avoid obstruction of the periphery of the lens. The lens is either permanently secured to the face of the flange or removably coupled therewith; and the interior bore of the barrel is lined or otherwise provided with opaque material.

REFERENCES:
patent: 2146662 (1939-02-01), Albada
patent: 2229594 (1941-01-01), Seiler
patent: 2538077 (1951-01-01), Blosse

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