Revolving door system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 17, 2002
Grant Date -
N/A
app pub date -
Oct 12, 2000
filing date -
Nov 2, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A revolving door system includes outer walls (2) disposed in parallel with a doorway in a building. A hollow center core (3) having a racetrack-shaped cross-section is disposed between the outer walls, whereby passageways are defined by the lower surface (4a) of a ceiling (4), the floor, the center core and the outer walls. Upper and lower rails (10) and (11) are secured within the center core, and with which plural sets of upper and lower suspension devices (13) and (14) are movable engaged. A plurality of doors (12) are supported by the upper and lower suspension devices. A pulling bar (56) is linked to the upper suspension device for each door. The pulling bars are connected to a driving chain (75) driven to move by a door driving arrangement. A carrier bar (15) is connected to each upper suspension device, for rotatably supporting the upper portion of each door at a location near the center core. The lower portion of each door is rotatably supported by one of the lower suspension devices. An electromagnetic locking arrangement (51) detachably holds the upper portion of each door with respect to the carrier bar at a location remote from the center core.
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Cited Art Landscape
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