Selectively interlocked double security doors

Details Selectively interlocked double security doors Selectively interlocked double security doors

1979-10-05

1981-12-01

Kannan, Philip C.

Movable or removable closures

Facially opposed primary and auxiliary closure for common...

Auxiliary mounted for movement

49 67, 49163, 292DIG17, 292150, E05B 6504, E05C 702

Patent

active

043029078

ABSTRACT:
A personal security door arrangement constituted by the juxtaposition of two doors, which may be coupled together at will, in one same frame in an opening, the outer door affording complete visibility and, possibly, the passage of small objects, while the inner door is conventional. Said doors are hingedly mounted to the frame on the same side, rotate in the same direction and have interrelated lock arrangements.

REFERENCES:
patent: 2177617 (1939-10-01), Hinton
patent: 2537896 (1951-01-01), Hinton et al.
patent: 2640720 (1953-06-01), Brown
patent: 3722237 (1973-03-01), Taylor

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