Butterfly valve for accordions and its dynamic connection with the key
OwnerMario Crucianelliinventor
Life of this patent
Estimating the term…
Abstract
In a rectangular frame on the accordion box (CA) in correspondence with a single continuous opening (2), a butterfly closure member (3) is pivotally mounted on a fulcrum, and is held in a closed position with a spring (7). A block (9), pushed forward by the lever arm of a white key (B), presses on sliding with its inclined plane (10) against a peg (8) of the pivoted butterfly closure member (3) of any valve operated by the white key to open it. A black key (N) acts directly an a peg (8') of the pivoted butterfly closure member (3') of any valve operated by a black key, to open it. Specialized labor is eliminated; assembly times are reduced by 50%; the seal of the valves and the sound of the instrument are considerably improved (FIG. 1).
Claims6
An improved accordian valve for an accordian which has a harmonic box, a plurality of air outlet openings in said harmonic box, a plurality of valves for opening and closing said air outlet openings, and a plurality of manually operable keys which are operatively connected to said valves so as to move said valves in response to manual actuation of said keys, said valve comprising,
- a frame member which is provided with a single slot (2) opening, said frame member being mounted on the harmonic box (CA) with said slot opening positioned in correspondence with one of said air outlet openings,
- a butterfly closure member (3, 3') for opening and closing said slot (2) provided in said frame member, said closure member having opposite ends which are pivotally mounted on said frame member;
- a spiral spring (7, 7'), anchored to said frame member and operating on said butterfly closure member (3, 3') to close it;
- a peg (8, 8') protruding laterally from said butterfly closure member, and means connected to a said key (B, N) for engaging said peg to open the valve (1, 1').
Dependencies are inferred from the claim text.