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Патент USA US2135310

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Nov. 1, 1938.
c. LlNDEBERG
HIGH FREQUENCY REED BLOCK
Filed Feb. 2l, 1938
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2,135,310
Patented Nov. 1, 1938
2,135,310
UNITED STATES
PATENT OFFICE.
2,135,310
HIGH FREQUENCY REED BLOCK
Carl Lindeberg, De Kalb, Ill., assignor to The
Rudolph Wurlitzer Company, De Kalb, Ill., a
corporation of Ohio
Application February 21, 1938, Serial No. 191,629
8 Claims.
This invention relates to a special construction
for the reed block and tone chambers formed
therein, for serving the high frequency reeds of
an accordion or like instrument, sometimes
5 termed the “piccolo reeds”. The purpose of the
invention is to ensure the proper sounding of
these high frequency reeds under varying condi
tions of suction` and pressure which arise in play
ing different types of music. The invention con
sists in certain features and elements of con
struction in combination, as herein shown and
described and as indicated by the claims.
In the drawing:
Figure 1 is a side elevation of a reed block em
15 bodying this invention, with most of the reeds
omitted therefrom to simplify the drawing.
-Figure 2 is a longitudinal section across the
reed block taken substantially as indicated at line
2_2 on Figure 1.
20
Figure 3 is an end elevation as indicated at
line 3_3 on Figure 1.
Figures 4, 5 and 6 are transverse sections taken
respectively as indicated at lines 4_4, 5_5 and
6_6 on Figure 1.
25
Figure 7 is an elevation of the other end of
the reed block taken as indicated at line 1_1 on
Figure 1.
Heretofore, it has been` found undesirable to
employ high frequency reeds_that is, reeds of
30 extremely high pitch_in an accordion, because
of the difficulty of arranging such reeds so that
they will operate satisfactorily. When mounted
on a standard reed block in the same relative po
sitions as the reeds of lower pitch, they are often
found to “choke” on high pressure, or to fail
to respond properly at low pressure. In some
cases an attempt has been made to correct this
condition by mounting the reeds of highest fre
quency in planes parallel to and directly oppo
40 site the ports of their respective reed chambers,
but, except for the very shortest reeds, this oc
cupies too much space, widening the reed block
so as to cause difficulty in accommodating it in
the standard dimensions of the instrument;
45 hence, this expedient is usually limited to the
three or four reeds of highest pitch, with the
result that there is a definite break in tone qual
ity between these reeds and the next few in the
scale; the lower reeds of the piccolo octave have
a tendency to sound muñled and are unreliable
in their action.
The present invention provides an arrange
ment by which a full octave of high frequency
reeds is arranged in the same manner so as to
55 exhibit a uniform tone quality, and this mount
(Cl. 84-376)
ing has been found to result in a much more sat
isfactory operation of the reeds under varying
conditions than in previous construction.
Throughout the high frequency or piccolo range
the reeds respond and “speak out” clearly, both 5
on low pressures and high pressures, and
throughout the intermediate range, acting deñ
nitely and positively at all times, whether the in
strument is being played forte or pianissimo.
The drawing illustrates a reed block for an ac
cordion containing a. full octave of piccolo reeds,
four of such reeds l being shown in place on the`
reed block, and the remainder being omitted.>
Three of the reeds 2 of the next lower range are
also shown in this View. The reed block has the
usual base 3 with ports 4 leading to the individ
ual reed chambers which are formed in two rows
on opposite sides of a longitudinal partition 5
and separated by transverse partitions 6. For
the reeds 2 of the lower range, the sides of the
chambers opposite the partition 5 are left open,
and are closed by the plates 'l on which the reeds
and their flap valves 8 are carried, each plateI
carrying one pressure reed and a similarly tuned
suction reed in the usual manner on its oppo
site faces. Similar plates 9 are provided for each
of the reeds I in the high frequency range, but
for this octave the reed chambers are closed for
a considerable portion of their height by means
of a lateral wall I0 extending from the base
flange 3 about half-way up the sides of the cham~
bers, as seen in Figure 1. Inside the chambers
of the- high frequency range the partition wall
5 instead of sloping flatly and continuously from
the end to end, consists of a portion 5a which ex
tends upwardly from the base 3 substantially to
the same height as the side wall ID and a second
portion 5b which trends at an angle to the portion
5a. As may be seen from the sectional views,
Figures 5 and 6, the wall I0 extends somewhat 40
obliquely so as to partly overhang the port 4 in
the base of the chamber; the surface 5EL of the
wall 5 trends obliquely from the base 3 in about
the same direction as the wall l0 while the sur~
face 5‘D inclines somewhat more from the per~ 45
pendicular than 'the surface 5a. The reed-sup:
porting plate 9 carrying the reeds I connects with
the upper edge of the inclined Wall l0 and is it
self inclined more sharply than the wall I0 but
in the same direction away from the perpendicu 50
lar to the base 3. There is a slight convergence
between the inner surface of the Wall I0 and the
surface 5a of the partition 5 and there is a fur
ther convergence between the plate 9 and the
surface 5IO so that the upper edge of the plate 9 55
2,135,310
2
approaches the surface 5b about as closely as is
practicable in View of the necessary clearance
for vibration of‘the reed l.
As a result of this formation, each of the reed
chambers for the high frequency reeds I is ta
pered, narrowing from the port 4 to the opposite
end of the chamber, and, in addition, the reed
I is mounted at a considerable distance from
the port 4 but obliquely with respect to the
plane of the port. Thus the portion of the reed
chamber ’defined by the Walls I0 and 5a forms
a throat-way leading to the further tapered por
tion of the chamber opposite the reed l.
It is found that this construction of the reed
f chambers for the high frequency reeds ensures
satisfactory and reliable operation of these reeds
throughout the entire range of pressures which
are experienced in the operation of the ac
cordion; and, as will be seen by comparison of
the various sectional views and elevations of
the reed block, the piccolo reeds do not require
any widening of the block to accommodate them,
as is the case when they are mounted parallel
to the plane of the base 3. The construction
lends itself readily to convenient methods of
manufacture, and ensures pleasing, clear tones
in the upper ranges of the accordion.
While there is shown and described herein
certain specific structure embodying the inven
tion, it will be manifest to those skilled in the
art that various modifications and re-arrange
ments of the parts may be made without de
parting from the spirit and scope of the inven
tion, and that the same is not limited to the
particular form herein shown and described, ex
cept in so far as indicated by the appended
claims.
I claim:
l. In an accordion reed block, a series of tone
chambers for high frequency reeds, each of said
chambers having a port at one end and being of
tapering cross-section narrowing from the port
ed end to the opposite end, said chamber being
closed on all sides for a considerable distance
~ from the port with the reed mounted in a por
tion of one side wall adjacent said opposite end
of the chamber.
2. In an accordion reed block, a series of tone
chambers for high frequency reeds, each of said
50 chambers having a port at one end and being
of tapering cross-section narrowing from the
ported end to the opposite end, said chamber
being closed on all sides for a considerable dis
tance from the port with the reed mounted in a
` portion of one side wall adjacent said opposite
end of the chamber, said reed being disposed
in a plane oblique to the plane of the port.
3. In combination, an accordion reed block
lincluding a tone chamber for a high frequency
reed, said chamber having a port at one end, 5
and a substantially straight reed mounted at a
considerable distance from said port and oblique
ly opposite the same.
i
4. In combination, an accordion reed blockì
including a tone chamber for a high frequency*l 10
reed having a port at one end and comprising
an air passage leading from said port, and a
reed disposed obliquely across said passage at
the end of the same opposite the port with the
tongue of the reed extending away from said 15
port.
5. In an accordion reed block, a tone chamber
for a high frequency reed, said chamber having
a port at one end with a tapering throat lead
ing from said port and a further tapering pas- 20
sage extending from the end of said throat at
a slight angle to the axis of the throat, with a
reed mounted in one side of said passage.
6. In an accordion reed block, a tone chamber
for a high frequency reed having a port at one 25
end with two parallel walls connected by a
third wall comprising a section adjacent the
port and a second section extending from the
end of the first at an obtuse angle thereto, to
gether with a fourth Wall composed of a solid 30
section disposed adjacent the port and opposite
the first section of the third wall, and an aper
tured section supporting a reed and extending
opposite the second section of the third wall at
an obtuse angle to the solid section and converg- 35
ing toward said wall at the end remote from
the port.
7. In an accordion reed block, a series of tone
chambers for high frequency reeds, each of said
chambers having a port at one end and being 40
of tapering cross-section, narrowing from the
ported end to the opposite end, said chamber
being closed on all sides for approximately one
half of its length from the port end, and hav- 1
ing a reed mounted in a portion of one side wall 345
adjacent said opposite end of the chamber.
8. In an accordion, a reed chamber having a i
port at one end and being of tapering cross
section, narrowing from the ported end to the
oppositel end, and a reed mounted in a portion
of the side wall remote from the port, the axis o
of the chamber being bent away from the per
pendicular to the plane of the port and in such
a direction that the reed is disposed opposite
the port.
r
CARL LINDEBERG.
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