Movable or removable closures – Radiant energy control
Patent
1977-01-24
1977-12-06
Kannan, Philip C.
Movable or removable closures
Radiant energy control
49 42, 49383, E05F 1520, E05D 1502
Patent
active
040609359
ABSTRACT:
A revolving door assembly comprising a cylindrical vertically extended door housing, a vertically mounted door comprising a plurality of radially extended leaves connected to a central axis, and a canopy mounted above said door and integral with said housing, said canopy having mounted therein a linearly elongated radiant energy emitting device providing a rectangular, planar energy field, said device mounted in radial relation to the axis of said door and adapted upon the interruption of any portion of the energy field thereof to actuate the locking of said door in position whereby escape from a portion of said housing is prevented.
REFERENCES:
patent: 902982 (1908-11-01), Maier
patent: 2055828 (1936-09-01), Shields
patent: 2331340 (1943-10-01), Mosher
patent: 2341545 (1944-02-01), Hagenbook
patent: 2511793 (1950-06-01), Telbizoff
patent: 3285209 (1966-11-01), Pace
patent: 3903996 (1975-09-01), Berkovitz et al.
Liebetrau Richard E.
Miller Larry J.
Miller Marion V.
Bachman Robert H.
Dawson Robert A.
Kannan Philip C.
Swiss Aluminium Limited
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