Audio peephole for doors

Details Audio peephole for doors Audio peephole for doors

1998-12-03

1999-12-28

Redman, Jerry

Movable or removable closures

Mounted for optional movements

One closure movable separately from or with other closure

E06B 728

Patent

active

060064749

ABSTRACT:
The audio peephole for doors (T) comprises two flange bushings (2, 3), which are inserted into one another and held together by a two-piece screw-type optical spy-hole (1), with the flange bushings (2, 3) having in their flange (2a, 3a) a central reception hole (4) for the optical spy-hole (1) and at a distance around this central reception hole (4) a plurality of sound apertures (5) penetrating the flange (2a, 3a) and terminating in the hollow space (H) of the flange bushings (2, 3). These sound apertures (5) can be opened for sound transmission and closed against sound transmission by means of a manually rotatable apertured disk (6) provided behind the flange (2a) of the flange bushing (2) on the interior of the door.

REFERENCES:
patent: 775798 (1904-11-01), Chase
patent: 1340673 (1920-05-01), Roe
patent: 4644687 (1987-02-01), Liou
patent: 5671564 (1997-09-01), Lyle

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