| 摘要 |
The mouthpiece comprises two parts, rotatable in relation to one another, and both having channel systems running axially. These channels can communicate with one another along axially running gaps, the size of which depend upon the reciprocal angle position of the two parts. The first mouthpiece part has a cylindrical part with a number of axial surface tracks, and a second tubular part which has a corresp. number of internal axial tracks. The first mouthpiece part cylindrical section passes into the second tubular part with very slight radial clearance. The internal axial tracks in the inlet end of the second mouthpiece part commence in the same vertical plane as the external axial tracks in the first mouthpiece part. Both types of tracks are so wide that in a first extreme rotation position they either do not communicate with each other or only by forming a very small gap. In another extreme position there is max. communication between them, with a gap being formed the width of which correspond to their width. |
