Tobacco smoke filter

Claim 1

A tobacco smoke filter having a plurality of detachably connected sections comprising: (a) a cigarette receiving and holding section, said receiving section having a hollow cavity with a first end of the cavity open to receive a cigarette, a first expansion chamber downstream of said hollow cavity, first wall means defining a second end of the cavity and separating said cavity from said first expansion chamber, a longitudinally extending reduced diameter projection extending from said first wall and into the first expansion chamber, a first restricted bore extending on the longitudinal axis of the filter through said first wall and throughout the reduced diameter projection for communicating said cavity with said first expansion chamber; (b) a heat dissipating section connected to said cigarette receiving section, a second wall means associated with the heat dissipating section and extending perpendicularly to said first restricted bore immediately downstream thereof, so that smoke passed through the first restricted bore is deflected by a first side of said second wall and circulated throughout the first expansion chamber, a solid projection extending longitudinally from a second side of said second wall, a second restricted passage extending through said second wall at a radially outward location to communicate smoke from said first chamber with the outer surface of said solid projection of the second wall, an air inlet opening located on an annular outer edge of said heat dissipating section downstream of said second wall; (c) a rotatably adjustable air mixing section removably connected to said heat dissipating section, said air mixing section having an annular outer wall having a larger inner diameter than the outer diameter of said second wall solid projection to define a second expansion chamber which has a third wall extending perpendicular to said second wall solid projection at a location downstream thereof, an annular inner shoulder formed on the extreme upstream end of said air mixing section, said annular inner shoulder having a series of spaced apart passages of different cross sections thereon, said passages adapted to be selectively placed in communication with said air inlet opening to conduct ambient air into the smoke stream for mixing therewith in said second expansion chamber, indexing means for positive engagement between said heat dissipating section and said air mixing section to selectively positively engage one of the spaced apart passages with the air inlet opening, and indicating means for indicating to the user of the filter device precisely which one of the varying sized spaced apart passages is in communication with the air inlet opening, said third wall having a centrally located restricted outlet bore extending longitudinally therethrough and into an enlarged diameter third expansion chamber formed in said third wall at the downstream end thereof; and (d) a mouthpiece section attached to the air mixing section downstream of the third expansion chamber.