Inspection device with adjustable viewing screen

Details Inspection device with adjustable viewing screen Inspection device with adjustable viewing screen

1986-07-07

1988-08-02

Corbin, John K.

350577, G02B 702

Patent

active

047610654

ABSTRACT:
An inspection device which can be used to enable a visitor on the outer side of a door (12) to be viewed from the inner side has a tube (1) extending through the door. At the end of the tube (1) on the inner side of the door there is a screen (36) and a lens system (5, 23) is provided to produce a viewable image of the visitor on the screen (36). The positioning of the screen (36) relative to the tube (1) can be adjusted e.g. with a rack and pinion mechanism (39, 40, 41) operated by a knob (42), and an image inverter such as a prism (43) is provided to give an upright image on the screen (36).

REFERENCES:
patent: 1682139 (1928-08-01), Mitchell
patent: 3434773 (1969-03-01), Pitchford

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