Opposed blade balanced damper

Details Opposed blade balanced damper Opposed blade balanced damper

1987-11-05

1989-04-04

Joyce, Harold

Valves and valve actuation

Rotary valves

Ball valve

98116, 251212, 251279, F24F 1310

Patent

active

048175080

ABSTRACT:
An opposed blade balanced damper includes three sector-shaped damper blades individually mounted to a frame for pivotal movement around a pair of pivot tabs integrally formed on each damper blade. A user-actuable control assembly simultaneously controls the relative rotational position of each damper blade so as to selectively regulate airflow through a duct. The damper blades and control assembly function to direct airflow toward the center of the duct and thereby maintain symmetrical airflow through the duct. This is achieved by rotating the damper blades so that the inner ends of the damper blades move downstream, and the outer ends of the damper blades move upstream, as the damper blades are rotated from a closed to an open position.

REFERENCES:
patent: 2400044 (1946-05-01), Hermanson
patent: 2783702 (1957-03-01), O'Day
patent: 3072041 (1963-01-01), Downing
patent: 3095178 (1963-06-01), Veber
patent: 4067540 (1978-01-01), Slade
patent: 4628954 (1986-12-01), Dayus
Nailor-Hart Industries, Inc. Drawing 4200-6 titled "Radial Opposed Blade Damper Model 4276 Integral Mounting".
Nailor-Hart Industries Inc. Drawing 4200-7, titled "Radial Opposed Blade Damper Model 4275".

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