| 摘要 |
A moveable key lever pivot bearing system for keyboard instruments in which the pivot bearing is provided with a longitudinal slot to enable mounting the bearing over a pivot pin disposed on a balance rail mounted within the case of the instrument. The key lever, pivot pin, and balance rail all remain in fixed relationship to one another resulting in a fulcrum point change when the bearing is longitudinally shifted back and forth with respect to the pianist. Means are provided to fix the bearing at a selected longitudinal position, extension arms for example, which may be manipulated to adjust the position of the bearings
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