Fluid handling – Flow affected by fluid contact – energy field or coanda effect – Means to regulate or vary operation of device
Patent
1990-01-26
1991-10-29
Joyce, Harold
Fluid handling
Flow affected by fluid contact, energy field or coanda effect
Means to regulate or vary operation of device
137601, F24F 1314
Patent
active
050605577
ABSTRACT:
A smoke damper which includes a rectangular frame and blades mounted in the frame such moveable between a position in which all of the blades are essentially coplanar with adjacent edges of adjacent blades being contiguous one with another, and a position in which the blades are rotated 90 degrees from the previous position with individual blades in planes parallel one with another. At least one of the blades has a recess formed along the length of the blade surface proximate to an edge of the blade and an elastomeric gasket mechanically secured to the edge of the blade having the recess which extends part-way across the recess from the edge of the blade towards the blade central portion. A second blade adjacent to the first blade has an edge along its length extending angularly towards the first blade when the blades are coplanar and the smoke damper is closed, the edge of the second blade being tangent to the elastomeric gasket such that upon the smoke damper being closed and the blades being coplanar, the gasket deforms against the edge of the second blade responsively to air flow directed against the blades towards the recess and entering the recess.
REFERENCES:
patent: 3123098 (1964-03-01), Bishop
patent: 3366032 (1968-01-01), Alamprese
patent: 3447443 (1969-06-01), Silvey
patent: 3530783 (1970-09-01), Alamprese
patent: 4409990 (1983-09-01), McCabe
patent: 4487214 (1984-12-01), Tatum
Joyce Harold
Penn Ventilator Company, Inc.
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