Quarter point return mechanism for manually operated revolving d

Details Quarter point return mechanism for manually operated revolving d Quarter point return mechanism for manually operated revolving d

1987-06-10

1989-01-31

Kannan, Philip C.

Movable or removable closures

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

E05D 1502

Patent

active

048006793

ABSTRACT:
This invention relates to a quarter point return mechanism for a manually driven revolving door. Revolving door leaves extending outwardly from a shaft are partially enclosed between opposed curved sidewalls. The return mechanism has a number of elements including an actuator, a rack arranged to be linearedly displaced by the actuator, and a pinion engaging the rack and being rotatable in opposite directions. The pinion is rotatably connected to the central shaft of the door. When the pinion is rotated in one direction, rotation is transmitted to the shaft. When the pinion is rotated in the opposite direction, the rotation is not transmitted to the shaft. Also included is a circumferential displacement sensor which operates the actuator when the outer ends of the door leaves are in a position circumferentially displaced from the sidewalls. The return mechanism returns the door leaves to a rest position in which the door leaves are in contact with the curved sidewalls.

REFERENCES:
patent: 1920397 (1933-08-01), Johnson
patent: 2954971 (1960-10-01), Simpson
patent: 3285209 (1966-11-01), Pace
patent: 3349876 (1967-10-01), Sheckells
patent: 3364620 (1968-01-01), Hess
patent: 3497997 (1970-03-01), Sheckells
patent: 3526820 (1970-09-01), Sheckells
patent: 3678623 (1972-07-01), Jenkins
patent: 4060935 (1977-12-01), Miller
patent: 4255900 (1981-03-01), Magnani
patent: 4295297 (1981-10-01), Carroll
patent: 4530183 (1985-07-01), Heise

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