Shut-off damper
First Claim
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1. A shut-off damper comprising:
- (a) a frame defining an opening;
(b) a line of blades which are supported in and surrounded by said frame for rotary motion about substantially parallel axes to open and close the opening in said frame;
(c) at least two thin springy sealing strips made of a relatively hard and strong material arranged at the ends of said blades; and
(d) respective coverings of a relatively soft resilient material on said strips, each covering being between the strip it covers and adjacent ends of said blades, whereby the end portions of said blades make sealing contact with said coverings to hinder the leakage of fluid past said blades when they are in their fully closed positions.
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Abstract
A shut-off damper comprising a line of blades which are supported in a surrounding frame for rotary motion about substantially parallel axes to open or close an opening in the frame, and springy sealing strips each provided with a lining or cover of synthetic rubber or other resilient material so that the end portions of the blades make sealing contact with the said linings or covers to reduce or prevent the leakage of fluid past the blades when they are in their fully-closed positions.
30 Citations
13 Claims
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1. A shut-off damper comprising:
- (a) a frame defining an opening;
(b) a line of blades which are supported in and surrounded by said frame for rotary motion about substantially parallel axes to open and close the opening in said frame;
(c) at least two thin springy sealing strips made of a relatively hard and strong material arranged at the ends of said blades; and
(d) respective coverings of a relatively soft resilient material on said strips, each covering being between the strip it covers and adjacent ends of said blades, whereby the end portions of said blades make sealing contact with said coverings to hinder the leakage of fluid past said blades when they are in their fully closed positions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- (a) a frame defining an opening;
Specification