Valves and valve actuation – Rotary valves – Butterfly
Patent
1977-02-22
1978-09-12
Nilson, Robert G.
Valves and valve actuation
Rotary valves
Butterfly
49 88, 98113, 137601, 251308, F24F 1314, F16K 122
Patent
active
041132300
ABSTRACT:
A fire, smoke and air control damper is disclosed wherein one or more hook-shaped hinge portions formed intermediate between the longitudinal edges of each damper blade engage complementally configured hook-shaped hinge elements formed on opposite sides of the damper frame. A novel notch configuration is made in an inwardly depending flange in the frame on opposite sides, the hinge elements being made from at least a portion of the material notched from the frame. In the closed position, various blade portions engage opposite sides of the inwardly depending flange in the frame to form a seal therebetween, thereby providing a positive pressure resistant seal. The seal is made more complete along the flange in the area of the hinge element because of the novel notch configuration.
Several embodiments of actuating the blades to move them between open and closed positions are disclosed. In one such embodiment, a link passes through an arcuate opening in the wall of the frame to engage a linkage rod. Alternatively, an external drive bracket is attached to the front surface of a blade and extended around the frame to form a rod and handle for actuating the blades.
REFERENCES:
patent: 145871 (1873-12-01), Hitchcock
patent: 1695768 (1928-12-01), Kelly
patent: 2884005 (1959-04-01), Honerkamp
patent: 3017899 (1962-01-01), Goldsmith
patent: 3423066 (1969-01-01), Henrion
patent: 3426507 (1969-02-01), Kossowski
patent: 3908529 (1975-09-01), McCabe
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