Insulating and draft preventing automatic shutter for attic and

Details Insulating and draft preventing automatic shutter for attic and Insulating and draft preventing automatic shutter for attic and

1981-03-30

1983-02-08

Tapolcai, Jr., William E.

Fluid handling

Flow affected by fluid contact, energy field or coanda effect

Means to regulate or vary operation of device

98110, 98121A, 137601, F24F 706

Patent

active

043721966

ABSTRACT:
An insulating cover for the opening of an attic fan or other exhaust type fan and comprising a mounting frame engagable with the inner periphery of the opening, two insulating panels and disposed within the mounting frame and movable between closed and open positions with respect to the opening in response to the activation or deactivation of the fan, a floating inner frame supporting the insulating panel and pivotally secured to an intermediate frame, which is secured to the mounting frame by an offset pivot connection, stop plates provided on the intermediate frame for engagement with the mounting frame to limit the movement of the intermediate frame, stop plates secured to the mounting frame and disposed inboard with respect to the opening for limiting the movement of the insulating panel in one direction, biasing spring member secured between the stop plates and the inner frame for biasing the insulating panels toward a normal closed position and retaining the insulating panels against fluttering in an open position thereof, and sealing members interposed between the mounting frame and the insulating panel in the closed position thereof.

REFERENCES:
patent: 1874043 (1932-08-01), Ilg et al.
patent: 2571374 (1951-10-01), Mayr
patent: 3249038 (1966-05-01), Johnson
patent: 3964377 (1976-06-01), Chapman
patent: 4203566 (1980-05-01), Lord
patent: 4217816 (1980-08-01), Mancinelli

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