Fluid handling – Flow affected by fluid contact – energy field or coanda effect – Means to regulate or vary operation of device
Patent
1989-07-10
1990-05-15
Joyce, Harold
Fluid handling
Flow affected by fluid contact, energy field or coanda effect
Means to regulate or vary operation of device
29890126, 98 86, 137 77, 251329, F24F 1100
Patent
active
049247603
ABSTRACT:
A roof vent damper for closing a roof mounted ventilator in the event of a fire includes a frame formed from an elongated rectangular plate having a central dumbbell shaped cut-out. Longitudinal side edges of the plate are folded over to form parallel guide track members. The plate is then folded along a central transverse line extending across a narrow central portion of the cut-out to form overlying plate members separated by a hollow guide track. A damper plate is received for reciprocal sliding movement in the guide track and is retained in an open position by a fusible link which separates at a predetermined elevated temperature. The damper is biased to a closed position by a coil spring.
REFERENCES:
patent: 2183645 (1939-12-01), Hansen
patent: 2218926 (1940-10-01), Teichmann
patent: 2285829 (1942-06-01), Maage, Jr.
patent: 2923225 (1960-02-01), Massey
patent: 4759270 (1988-07-01), Lindeen
Joyce Harold
Kearns Jerry T.
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