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Патент USA US2122094

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June 28, 1938-
,
A. FRONTALINI
2,122,094
RESOUNDING BOARD FORACCORDIONS
Filed April 3, 1937
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my
2,122,094
Patented June 28, 1938
UNITED STATES PATENT OFFICE
2,122,094
RESQUNDING-BOARD' FOR ACCORDIONS
‘Alfredo Frontalini, Numana, Italy
Application April 3, 1937, Serial No. 134,877
In Italy January 11, 1937
2 Claims.
(Cl. 84—376)
My invention relates to improvements in ac
cordions, and aims to obtain a better sounding
effect by the disposition of two double resounding
boards. Resounding spaces have already been
5 proposed for accordions inside the single chests
bearing the metallic reeds, but as these spaces
were hermetically closed and as their walls were
not quite free for vibration the effect obtained
was not satisfactory.
According to my present invention the two
10
simple resounding boards,—existing in each ac
cordion between the chests bearing the reeds and
the valves of the two sound boards, the one of
which is for soprano voices and the other for
15 basso voices, are doubled so as to form between
them one large resounding chamber serving for
all the voices of each sound board, this chamber
having in one of the two parallel walls, connected
and distanced by short pipes through which
passes the air producing the sounds, a suitable
aperture for the issue of the sound waves.
Other features of the invention will be ex
plained in the following speci?cation referring
to the drawing which represents a form of
execution of the invention.
Figure 1 shows in a perspective view and
partially in section the sound-board for the
soprano voices with the double resounding board,
Figure 2 shows in a corresponding view the
sound-board for the basso voices,
Figure 3 is a transversal section through the
chests bearing the reeds, through the valves and
the double resounding board,
Figure 4 shows as a detail a peculiar form of
dicated by the same reference numerals. Instead
of the ?at keys ‘I, the known cylindrio keys 1’ of
the basso are provided. In the space 8 is con
tained the mechanism for the movement of the
valves 6.
In Figure 3 the chests I bearing the metallic
reeds 2 are shown sectioned. All of these chests
are mounted on a wooden base 9 and these bases
are applied on. the board 3, 3’.
In the ?gures from 1 to 3 the pipes are of a my
cylindric shape. The Fig. 4 shows as a detail a
pipe having a step and a prominent round border.
By this variation a means for ?xing the exact
distance between the two walls 3, 3’ of the double
resounding board is obtained and also the valves 15
5 are distanced from the wall 3’, so avoiding a
contact between the valves and the resounding
wall. This improves the resounding e?ect.
Furthermore, the small prominence 4' of the wall
surface is an advantage in assembling this part 20
with the base 9 of the chests I.
It will be understood that the drawing does
not limit the scope of the present invention,
which comprises on the contrary all of the modi
26
fications within the following claims.
What I claim is:
1. An accordion in which the two resounding
boards, respectively for the soprano and for the
basso voices, existing between the chests. bearing
the reeds and the valves of each board are doubled 80
and form two large resounding chambers one for
the basso voices and one for the soprano voices,
each chamber having in one of the two parallel
walls a suitable aperture for the issue of the
sound waves, the two walls being connected and 35
at the same time distanced by short pipes through
two walls of the resounding board.
In Figure 1 the numeral 1 indicates the chests which passes the air producing the sound.
2. An accordion in which the two resounding
of the metallic reeds 2. The chests are all air
tight but removably arranged on the inner wall boards, respectively for the soprano and for the
basso voices, existing between the chests bearing ‘0
40 3 of the double wall 3, 3’, preferably of wood, the
outer wall 3’ being connected to and at the same the reeds and the valves of each board are
time distanced from the inner wall 3 by means doubled and form two large resounding chambers
of the short pipes 4 of metal, wood, Celluloid or one for the basso voices and one for the soprano
any other suitable material. The openings of the voices, each chamber having in one of the two
pipes 4 towards the outside are closed and opened parallel walls a suitable aperture for the issue 45
by means of the valves 5, of which only one is of the sound waves, the two walls being con
shown in the drawing. One of the sides 3, 3' of nected and at the same time distanced by short
the double resounding board is provided with an pipes through which passes the air producing
aperture 6 allowing the issue of the sound-waves. the sound, and which have a step for obtaining
the exact distance between the two walls and a 50
With 1 is indicated the key-board for the move
ment of the valves 6 of the sound-board for the prominent border for improving the resounding
effect.
soprano voices.
ALFREDO IE‘RONTALINI.
In Figure 2 are shown analogous parts of the
sound-board for the basso voices, which are in
the short pipes connecting and distancing the
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