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Air control device

  • US 4,407,187 A
  • Filed: 12/15/1981
  • Issued: 10/04/1983
  • Est. Priority Date: 12/15/1981
  • Status: Expired due to Fees
First Claim
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1. An air control device for use in conjunction with the air passageway of an air flow duct to control the flow of air therethrough, said air control device comprising:

  • (a) a stationary plate means for being attached to said air flow duct transverse of said air passageway, said stationary plate means having a substantially flat face and a plurality of circular apertures therethrough, the longitudinal axes of said apertures being at an oblique angle with respect to said face; and

    (b) a movable plate means for covering said plurality of apertures of said stationary plate means, said movable plate means having a substantially flat face and a plurality of circular apertures therethrough and being movable between a first position in which said plurality of apertures through said movable plate means are fully out-of-alignment with said plurality of apertures through said stationary plate means and a second position in which said plurality of apertures through said movable plate means are fully aligned with said plurality of apertures through said stationary plate means, the longitudinal axes of said apertures being at a right angle with respect to said face.

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