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RE: bass clarinet comparisons

Author: Don Berger
Date: 1999-07-21 18:11

A "double register key" mechanism [DRK] is usually found on only the pro models of the bass cl's, and actually serves 3 purposes, that of a high and a low register vent hole to "clean up" principally the mid-staff B,C,C# and D notes, and to provide a properly located and sized hole for the "pinch" Bb [the latter of necessity being provided on all basses]. It is usually actuated by closing the rt hand 3rd [ring] finger pad. Yamaha has 2 fairly recent patents US 4,848,206 and 4,809,580 on their mechanisms , a 3rd pat may be of interest, US 4,793,235. The references cited in the examination of these inventions will show the prior art of Sel, Buff and LeB. For similarities look at a saxophone and/or an oboe. You can view the text of these and other patents via http://www.uspto.gov/patft OR http://www.patents.ibm.com/patquery . The figures [drawings] are a bit harder to come by. Most of the texts on clar's will have some description also. Hope this may help, Don

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