F - Mech Eng,Light,Heat,Weapons – 24 – F
Patent
F - Mech Eng,Light,Heat,Weapons
24
F
98/52
F24F 13/08 (2006.01) F24F 13/15 (2006.01) F24F 13/14 (2006.01)
Patent
CA 2026745
-29- ABSTRACT OF THE DISCLOSURE A rotating blade damper for an air handling system, the damper having a perimetrical frame and a blade or a plurality of blades each of which is rotatable with respect to the frame between a flow permitting position and a flow blocking position. Each blade is biased toward its flow blocking position but is normally retained in its flow permitting position, for example, by a fusible link. In the event of a fire or other condition of excessive temperature the fusible link of a damper incorporating such a product will fail and each blade will rotate to its flow blocking position. A stop and lock mechanism is provided to stop each blade in a predetermined open or flow permitting position and to securely lock or latch each blade in its closed or flow blocking position. The stop and lock mechanism includes a disc segment which is carried by a blade rod, at a location outside of the damper frame, and a slide plate which is positioned between the damper frame and the disc segment. The slide plate is slidable with respect to the damper frame and the blade rod between a first position, corresponding to the open position of the blade, in which its movement is blocked by engagement with an arcuate portion of the disc segment, and a second position, corresponding to the closed position of the blade, in which it engages a stop surface at the trailing edge of the disc segment to mechanically block its return to a position corresponding to the open position of the blade.
Bereskin & Parr
Hill James R.
Mestek Inc.
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