Revolving door with security locking mechanism

Details Revolving door with security locking mechanism Revolving door with security locking mechanism

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.

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