Fluid handling – With indicator – register – recorder – alarm or inspection means – Position or extent of motion indicator
Patent
1997-04-24
1999-07-13
Rivell, John
Fluid handling
With indicator, register, recorder, alarm or inspection means
Position or extent of motion indicator
137315, 137552, 137559, 251305, 454333, F16K 3700, F24F 700
Patent
active
059212772
ABSTRACT:
A damper device for use with an air duct provides a paddle positioned within the air duct and an axle extending to one side of the paddle, through the duct wall and insulation to a position for manual adjustment of the position of the paddle within the duct. A bushing holds the axle in place, the bushing being tightened against the wall of the duct by a hand nut. The hand nut provides a brightly colored flag that is extendable when the damper device is in place. An O-ring is used to cause a frictional relationship between the paddle axle and the bushing so that the paddle is fixed into place once adjusted. A contour step on the bushing face allows engagement between the paddle and the bushing so as to hold the bushing from rotating while the hand nut is threaded into place on the bushing.
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