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Патент USA US2412212

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Dec. 10, 1946.
Filed Sept. 22, 1944
2 Sheets-Sheet l
Patented Dec. 10, 1946
Erving F. Gerlat, Racine, Wis.
Application September 22, 1944, Serial No. 555,221
1 Claim.
(Cl. 84-189)
This invention relates to musical instruments
and has as .its general object the provision of
piano of any conventional type, which, as is cus~
means ior imparting a vibrato quality to the
tone of a musical instrument such as a piano.
Another object of this invention is to provide
a device capable of imparting a vibrato quality
to musical instruments, which is especially ap
tomary, is equipped with a sounding board 5 at
the back thereof.
The device of this invention, indicated gener
ally by the numeral 1, is applied to the back
of the piano and when in position preferably
covers the entire back thereof. Essentially the
plicable to vertical pianos and when applied
device l‘ consists of an open faced chamber
greatly improves the appearance of the instru
formed by a curved upright wall 8, end walls 9,
10 and a top wall [0. The top wall It has a plural
Another object of this invention is to pro
ity of ports H, which, together, comprise an out
vide a device of the character described which
When in position overlying the back of the
may be constructed in various sizes for applica
tion to instruments other than pianos and also
piano, where it is held in any suitable manner,
to loud speakers, particularly of the type em
as by hooks I2 on the piano and brackets l3 on
ployed in connection with electric guitars and
the side wall 9, the sounding board or back of
the piano in general cooperates with the walls
similar musical instruments.
A further object of this invention is to pro
of the chamber to de?ne an air column, the out
vide a device of the character described which
is simple and readily applied to a piano or other -
let or space through which the sound waves move
to issue from ports H.
The chamber should fit tightly against the
back of the piano and preferably, though not
necessarily, a felt packing strip or the like is pro
vided along the vertical and bottom edges of the
chamber to seal the juncture between the back
described, and more particularly de?ned by the
of the piano and the edges of the open face of
appended claim, it being understood that such
the chamber.
changes in the precise embodiment of the here
In the upper portion of the chamber is a ro
indisclosed invention may be made as come with
tatable butter?y valve I4. This valve extends
30 from end to end of the chamber and is of a size
in the scope of the claim.
The accompanying drawings illustrate several
to substantially wholly close the air passage when
compiete examples of the physical embodiment
in a transverse position thus blocking the air
of the invention constructed in accordance with
column. Consequently, by rotation of the valve
the best modes so far devised for the practical
M the air column is intermittently interrupted to
application of the principles thereof, and in
impart a vibrato quality to the tone of the piano.
Rotation is preferably imparted to the butter
Figure 1 is a perspective view illustrating the
?y valve by a small electric motor l5 mounted
manner of applying the device of this invention.
within the chamber and drivingly connected
to a vertical piano;
thereto by a silent belt drive IS. The motor I5 is
Figure 2 is a cross-sectional View taken through 40 adapted to be controlled by the operator or player
Figure 1 on the plane of the line 2—2;
by means of a switch and control cord not shown.
Figure 3 is a top plan view of the vibrato proWhere the device of this invention is to be ap
ducing device per se;
plied to a horizontally strung or so-called
Figure 4 is a view illustrating the application
“grand” piano, it is mounted under the sounding
of this invention to a horizontally strung piano;
board, as shown in Figure 4, with the outlet ports
Figure 5 is a bottom view of the installation
ll facing the side of the piano. Obviously, of
shown in Figure 4;
course, the shape of the chamber must be some
Figure 6 is a side view with a part broken away
what altered to have it ?t the underside of such
and in section illustrating the application of this
a horizontally strung piano, but in its essential
invention to a loud speaker; and
50 characteristics the device is identical with that
Figure 7 is a front view of the device shown in
illustrated in Figures 1, 2 and 3.
Figure 6.
In the case of a horizontally strung piano, it is
Referring now particularly to the accompany
preferable, however, to install a barrier of in
ing drawings, in which like numerals indicate
sulation material over the strings as indicated at
like parts, the numeral 5 designates a vertical 55 ll’ in Figure 4. This insures the major portion
instrument with which it is to be used.
With the above and other objects in view, which
will appear as the description proceeds, this in
vention resides in the novel construction and ar
rangement of parts substantially as hereinafter 25
of the tone being dispelled downwardly by the
sounding board and through the vibrato produc
ing device.
The application of the invention to loud
speakers, as shown in Figures 6 and 7, is sub
stantially the same as that employed in conjunc
tion with a vertical piano excepting that the unit
is ,of smaller size and made to ?t the front of
the cabinet or housing ! 8 in which the speaker is
attachment, comprising: a shallow box-like
housing opening at its front and having a height
and width substantially corresponding to the
height and width of the piano for which the at
tachment is intended; means for attaching the
housing to the back of the piano with no portion
of the attachment projecting over or to the sides
of the piano so that the back wall structure of
the piano closes the open front of the attach
10 ment by contact with the side and top and bot
'From the foregoing description, taken in con
nection with the accompanying drawings, it will
be readily apparent to those skilled in the art
tom edges of the housing walls at said open front
thereof, whereby the attachment covers and con
ceals the back of the piano and cooperates there
that this invention provides a novel manner of
with to de?ne a substantially upright tonal pas
imparting a vibrato quality to a musical instru 15 sage, said housing having an upper transversely
ment such as a piano, which ordinarily does not
extending wall portion thereof provided with a
possess this characteristic, and that the device of
tonal opening acting as an outlet for said tonal
this invention is simple, readily applied and when
passage; a rotatable valve extending transversely
in position on a vertical piano greatly improves
across said tonal passage beneath the tonal open
the appearance of its back.
ing to intermittently block sound waves moving
What I claim as my invention is:
An attachment for upright pianos to improve
the appearance of the back thereof and to im
part a vibrato tone to pianos equipped with the
upwardly along the back wall of the housing to
wards said tonal opening; and means inside the
box-like housing for rotating the valve.
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