Movable or removable closures – Plural wings radiate from common pivot; i.e. – revolving
Patent
1985-03-15
1986-12-09
Downey, Kenneth
Movable or removable closures
Plural wings radiate from common pivot; i.e., revolving
49 44, 49 31, 49 35, E05D 1502
Patent
active
046271937
ABSTRACT:
A revolving door and controls therefor are set forth to restrict access into a room to only authorized personnel. The revolving door is disposed in a housing having an entrance and an exit into the room. The revolving door includes a plurality of wings which, in cooperation with the housing, define a plurality of compartments movable in response to rotation of the door to transport a person between the entrance and exit through the housing. Included are means for identifying authorized personnel and driving the door for rotation to transport that authorized person in a selected compartment between the entrance and the exit. Means are included for sensing two or more persons in the selected compartment moving from a starting point between the entrance and the exit, the sensing means reversely rotating the door to return the selected compartment to the starting point. Also included are means to prevent a subsequent, unauthorized person, attempting to use the same card key passed back by an authorized person passing through the door.
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patent: 4060935 (1977-12-01), Miller et al.
patent: 4295297 (1981-10-01), Carroll et al.
patent: 4341165 (1982-07-01), Calandritti et al.
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patent: 4458446 (1984-07-01), Mochida et al.
patent: 4475308 (1984-10-01), Heise et al.
patent: 4530183 (1985-07-01), Heise et al.
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