Revolving security door

Details Revolving security door Revolving security door

1979-09-24

1981-10-20

Downey, Kenneth

Movable or removable closures

Plural wings radiate from common pivot; i.e., revolving

109 8, E05D 1502

Patent

active

042952972

ABSTRACT:
Security door including a revolving door with a one way bearing continuously preventing rotation of the door in a reverse direction so that persons can only travel from an entry to an exit side of the door by passing around the door axis in a forward direction. A mat switch is positioned so that persons attempting to pass from the exit side to the entry side by revolving the door in the forward direction must stand on the mat switch and operate it. Operation of the mat switch causes operation of a clutch which locks the door against rotation in the forward direction.

REFERENCES:
patent: 2341545 (1944-02-01), Hagenbook
patent: 3285209 (1966-11-01), Pace
patent: 4063519 (1977-12-01), Pretini

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