Revolving doors

Details Revolving doors Revolving doors

1977-06-06

1979-05-15

Kannan, Philip C.

Movable or removable closures

Initial manual displacement energizes motor drive; e.g.,...

49 43, E05F 1510, E05D 1502

Patent

active

041540239

ABSTRACT:
A revolving door comprising at least one upright door element arranged in outwardly extending disposition about an upright axis of revolution, motor means being provided together with control means operable to position the door at a first rotational disposition from which, when the door is turned in one direction by a user pushing against said door element, power assistance is given to the door to effect rotation thereof; limit means being provided to cause the door to then come to rest at said first rotational disposition, in the absence of continued pushing by said user, after movement of the door under action of said motor means.

REFERENCES:
patent: 2442406 (1948-06-01), Gates
patent: 2886756 (1959-05-01), Schaefer
patent: 2954971 (1960-10-01), Simpson
patent: 2954971 (1960-10-01), Simpson
patent: 3424959 (1969-01-01), Gruner
patent: 3470653 (1969-10-01), Kalog
patent: 3497997 (1970-03-01), Sheckells
patent: 3526820 (1970-09-01), Sheckells
patent: 3678623 (1972-07-01), Jenkins
patent: 3903647 (1975-09-01), Hubbard et al.

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