Movable or removable closures – Plural wings radiate from common pivot; i.e. – revolving – Wings fold for through passage
Patent
1986-07-29
1987-08-25
Kannan, Philip C.
Movable or removable closures
Plural wings radiate from common pivot; i.e., revolving
Wings fold for through passage
49141, E05D 1502
Patent
active
046883509
ABSTRACT:
A revolving door (10) adapted to be mounted in a doorway to provide access and egress. The door (10) revolves about a vertical axis and has an upper cam housing (20) and a lower cam housing (22). Radial slots (24) extend through cam housings (20, 22). Pins (26) engage slots (24) and secure doorwings (12) to upper and lower cam housings (20, 22). A mechanism is mounted within at least one of cam housings (20, 22) for permitting doorwings (12) to be collapsed in panic situations or to accommodate large objects. At least one of the upper and lower cam housings has lateral bores (34) extending therethrough and intersecting the radial slots (24) at right angles. The mechanism for permitting the cam housings to be collapsed includes a cam mounted on each pin securing the doorwing to the cam housing and a spring-biased detent mechanism mounted within the lateral bore. This arrangement of the spring-biased detent mechanism within the lateral bore permits easy access to the detent mechanism for adjusting the pressure or force at which the doorwings collapse without the necessity of disassembling the revolving door.
REFERENCES:
patent: 1536196 (1925-05-01), Dyer
patent: 1886502 (1932-11-01), Shields
patent: 1890365 (1932-12-01), Blanchard
patent: 1963881 (1934-06-01), Blanchard
patent: 2114405 (1938-04-01), Shields
patent: 2539750 (1951-01-01), Nordin
patent: 3766686 (1973-10-01), Sheckells
Hattem Marwan E.
Rushford Calvin R.
Kannan Philip C.
Tubelite Division of Indall, Inc.
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