| 摘要 |
Invention herewith described refers to the metal key for piano accordion and belongs to the field of musical instruments manufacture. The key mechanism for tone or semi-tone, as shown in the drawing (Fig.2), consists of one sloping vertical lever (P.1) with the valve (Fk.1) or the valve (Fk.2) and one angular lever (P.2) with the key (Fp.2) on its horizontal arm connected with the coupling (S). Both keys rotate around their own axis (O.1, O.2) on the shafts mounted on the lever bracket (DP) at a certain distance. The invention ensures the equal pressure on all the keys on the instrument keyboard independent of the pressure of all keys with valves closing the sound holes on the sound-board.It makes it easier to perform musical melodies and faster and easier installation as well as the servicing of the instruments.
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