Movable or removable closures – Plural wings radiate from common pivot; i.e. – revolving
Patent
1991-12-19
1993-02-23
Kannan, Philip C.
Movable or removable closures
Plural wings radiate from common pivot; i.e., revolving
49 28, 49 31, E05D 1502
Patent
active
051878950
ABSTRACT:
A revolving door, particularly for the protection of the access to a room, comprises a rotating shaft, a number of door wings spaced around it and mounted thereto and a pair of opposite panels bordering the door wings and defining a partly closed zone with a first and a second opening. Further a drive motor for the shaft and a control unit for the drive motor are provided. The revolving door is provided with a detection means for detecting a person authorized or unauthorized to access the room, and a first sensor for detecting an unauthorized person entering the zone through the first or the second opening respectively. The control unit turns off the drive motor in response to the first sensor. A second sensor is adapted to detect the presence of an unauthorized person outside said zone in or close to the first or second opening respectively, wherein the control unit turns off the drive motor in response to said second sensor.
REFERENCES:
patent: 4530183 (1985-07-01), Heise et al.
patent: 4614057 (1986-09-01), Sorber
patent: 4627193 (1986-12-01), Schwarz
Boon Edam B.V.
Kannan Philip C.
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