Passages for one-way traversal especially for passenger traffic

Details Passages for one-way traversal especially for passenger traffic Passages for one-way traversal especially for passenger traffic

1974-06-14

1976-07-06

Gilliam, Paul R.

Movable or removable closures

Sequential closures for passageway

E06B 700

Patent

active

039674118

ABSTRACT:
The passage comprises two successive gates, maneouvrable in rotation in a single direction and conjugated to one another so that initially one is closed and the other open. These gates are sufficiently close to one another so that, on the opening of the first by a passenger arriving in the normal direction, the other closes thereby resisting the passage of a defrauder in the opposite direction.

REFERENCES:
patent: 220624 (1879-10-01), Jorgensen
patent: 349156 (1886-09-01), Greenleaf
patent: 677294 (1901-06-01), Van Kannel
patent: 2258896 (1941-10-01), Kelker
patent: 3169329 (1965-02-01), Powers
patent: 3314198 (1967-04-01), Frisk
patent: 3386202 (1968-06-01), Crews et al.
patent: 3478467 (1969-11-01), May

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