Patent ID: 6384306
Filing Date: 2002-05-07
Classification: G10D

Abstract:
In a wind instrument of having a tubular body (10), a secondary treble key (11), and a control shaft (22) adapted to be rotated by said secondary treble key (11) in a manner of enabling said tubular body (10) to play notes in a high range, said control shaft (22) being pivotally connected to said tubular body (10) and being securely formed with two spaced transverse pieces (20) having respective apertures (21) defined in alignment, the improvement comprising:a bar (30a) having a pair of opposed, egg-shaped ends (34a) received in said apertures (21) of said transverse pieces (20), each of said egg-shaped ends (34a) of said bar (30a) defining a threaded hole (31) therein and a plurality of splits (35) defined around said threaded hole (31); a pair of adjusting screws (32) threadedly engaged with said threaded holes (31) of said egg-shaped ends (34a) of said bar (30a), said adjusting screws (32) each having a flared head (33) adapted to spread a corresponding one of said egg-shaped ends (34a) of said bars (30a) as a result of deformability of said egg-shaped ends (34a) facilitated significantly by said splits (35); and whereby said egg-shaped ends (34a) of said bar (30a) are selectively received in said apertures (21) of said transverse pieces (20) with no clearance therebetween by adjusting said adjusting screws (32) in said threaded holes (31).