Air duct

Claim 2

An air duct comprising: a perforated cylindrical jacket having two ends; an air-intake connection at one end of said cylindrical jacket; a base at the other end of said cylindrical jacket opposite said air-intake connection at said one end; a single pair of two annular diaphragms within said jacket and having access openings that are identical in size, shape and position to form shutters for closing said openings; one of said diaphragms being secured stationary in said jacket and the other of said diaphragms rotating in said jacket relative to the one diaphragm.

Claim 3

An air duct as defined in claim 1, including a plurality of pairs of annular diaphragms rotatable in opposite directions within said jacket; said base having air-outlet openings, means for opening and closing said air-outlet openings.

Claim 4

An air duct as defined in claim 2, including a segmented disk above said base for closing off at least partly said air-outlet openings; a central positioning rod rotatable in said jacket; said other of said diaphragms rotating in said jacket having webs, said webs and said segmented disk being secured to said central positioning rod.

Claim 5

An air duct as defined in claim 3, wherein said air-outlet openings in said base remain closed when said other of said diaphragms rotating in said jacket and said segmented disk rotate together and said access openings being open or closed.

Claim 6

An air duct as defined in claim 3, wherein said access openings and said air-outlet openings in said base open simultaneously when said other of said diaphragms rotating in said jacket and said segmented disk rotate together.

Claim 7

An air duct as defined in claim 1, including a central positioning rod rotatable in said jacket; said other of said diaphragms rotating in said jacket having webs for securing said other of said diaphragms rigidly to said positioning rod; and a segmented disk above said base and rotatable separately from said other of said diaphragms.

Claim 8

An air duct as defined in claim 1, including springs between said one of said diaphragms and said other one of said diaphragms; limiting pins on said other of said diaphragms and extending into limiting grooves; a securing pin extending in a slot; a segmented disk above said air-outlet openings in said base; only one motor for moving said segmented disk and said other of said diaphragms in opposite directions and in predetermined sequence in one direction of rotation, said motor rotating in a reverse direction when said sequence is reversed.

Claim 9

An air duct as defined in claim 7, wherein said motor has a drive shaft, said motor rotating said drive shaft and rotating also in sequence around said drive shaft.

Claim 10

An air duct as defined in claim 1, including means for displacing said two annular diaphragms axially over the length of said jacket.

Claim 11

An air duct comprising: a perforated cylindrical jacket having two ends; an air-intake connection at one end of said cylindrical jacket; a base at the other end of said cylindrical jacket opposite said air-intake connection at said one end; at least one annular diaphragm slidable axially within said jacket; and means for moving said diaphragm axially back and forth, means for opening and closing said air-outlet openings, said annular diaphragm having a central opening, a portion of air admitted into said jacket passing through said central opening of said diaphragm and exiting through said air-outlet openings in said base, said diaphragm forming a vacuum pressure within space between said diaphragm and said base for deflecting air exiting at an angle with respect to said air-outlet openings, said annular diaphragm having a lowermost position for deflecting said air substantially vertically downward.

Claim 12

An air duct comprising: a perforated cylindrical jacket having two ends; an air-intake connection at one end of said cylindrical jacket; a base at the other end of said cylindrical jacket opposite said air-intake connection at said one end; at least one annular diaphragm slidable axially within said jacket; and means for moving said diaphragm axially back and forth, means for opening and closing said air-outlet openings, said annular diaphragm having a central opening, a portion of air admitted into said jacket passing through said central opening of said diaphragm and exiting through said air-outlet openings in said base, said diaphragm forming a vacuum pressure within space between said diaphragm and said base for deflecting air exiting at an angle with respect to said air-outlet openings, said annular diaphragm having a lowermost position for deflecting said air substantially vertically downward.

Claim 13

An air duct as defined in claim 10, including a plurality of separated diaphragms slidable axially back and forth within said jacket.

Claim 14

An air duct as defined in claim 11, including a rotatable segmented disk above said base and having a plurality of segments; said air-outlet openings in said base being at least partly closeable by said segments.

Claim 15

An air duct as defined in claim 11, including an upper diaphragm and a lower diaphragm, said lower diaphragm being positioned adjacent said base and telescoping with said upper diaphragm so that said upper diaphragm moves up and down independently of position of said lower diaphragm over a predetermined distance.

Claim 16

An air duct as defined in claim 10, including an additional diaphragm rigidly secured to said jacket.

Claim 17

An air duct as defined in claim 10, including cover strips mounted on said jacket.

Claim 18

An air duct as defined in claim 10, wherein said air-intake connection is located above said base and air passing through said air-intake connection flowing downward.

Claim 19

An air duct as defined in claim 10, wherein said jacket is positioned so that said base is at top of said jacket and said air-intake connection is located below said base, air passing through said air-intake connection flowing upward.

Claim 20

An air duct comprising: a perforated cylindrical jacket having two ends; an air-intake connection at one end of said cylindrical jacket; a base at the other end of said cylindrical jacket opposite said air-intake connection at said one end; a single annular diaphragm slidable axially within said jacket; and means for moving said diaphragm axially back and forth within said jacket; air streams passing through the jacket perforations forming an angle with the horizontal dependent on the air pressure with said jacket and adjacent said perforations; said base having air-outlet openings that can be opened and closed, said annular diaphragm having a central opening, a portion of air admitted into said jacket passing through said central opening of said diaphragm and exiting through said air-outlet openings in said base, said diaphragm forming a vacuum pressure within space between said diaphragm and said base for deflecting air exiting at an angle with respect to said air-outlet openings, said annular diaphragm having a lowermost position for deflecting said air substantially vertically downward.

Claim 21

An air duct comprising: a perforated cylindrical jacket having two ends; an air-intake connection at one end of said cylindrical jacket; a base at the other end of said cylindrical jacket opposite said air-intake connection at said one end; a single annular diaphragm slidable axially within said jacket; and means for moving said diaphragm axially back and forth within said jacket; air streams passing through the jacket perforations forming an angle with the horizontal dependent on the air pressure with said jacket and adjacent said perforations; said base having air-outlet openings that can be opened and closed, said annular diaphragm having a central opening, a portion of air admitted into said jacket passing through said central opening of said diaphragm and exiting through said air-outlet openings in said base, said diaphragm forming a vacuum pressure within space between said diaphragm and said base for deflecting air exiting at an angle with respect to said air-outlet openings, said annular diaphragm having a lowermost position for deflecting said air substantially vertically downward.