Double door

Details Double door Double door

1994-10-05

1996-12-03

Dorner, Kenneth J.

Movable or removable closures

Mounted for optional movements

One closure movable separately from or with other closure

E06B 728

Patent

active

055796052

ABSTRACT:
An entrance door for office or residence that has a main door equipped with a sub door where the main door is set locked when the sub door is opened. Dimension of the sub door is selected as big enough for article transfer through it and small enough for avoiding human being invasion.

REFERENCES:
patent: 4001970 (1977-01-01), Miyamoto
patent: 4523408 (1985-06-01), McConnell

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