Improvements in Fittings for the Mouth Pieces of Speaking Tubes.
Year: 1890

page_text: Date of Application, 29th Apr., 1890
Complete Specification Left, 28th Jan.. 1891-Accepted. 28th Feb. 1891
PROVISIONAL SPECIFICATION.
Improvements in Fittings for the Mouth Pieces of Speaking Tubes.
I, GEORGE FREDERICK SHEATH, of 89, City Road, St. Lukes, in the County
of Middlesex, India Rubber Manufacturer, do hereby declare the nature of this
invention to be as follows:-
The end of the speaking tube is furnished with a fitting carrying the mouth
piece as also the whistle and indicator whereby the speaking tube is hermetically
sealed when out of use and the whistle and indicator at such time brought into
position for use. As heretofore constructed such class of fittings have been
imperfect in their action.
Now the object of my present invention is to so construct such class of fittings
that they shall work perfectly truly and the moving parts be hermetically fitted so
as to ensure the fullest efficiency in use.
For this purpose I fit the end of the speaking tube on to a metal fixing, having
at the back of the fixing plate a short length of tube to which the speaking tube
is fitted and a longer piece of tube in front of the said fixing plate for the purpose
hereinafter described.
The mouth piece and the whistle and indicator are fixed to the moving body of
the fitting as heretofore at right angles (or thereabouts) to each other to enable the
one or the other to assume a position opposite the end of the speaking tube
according to whether the mouth piece is or is not for the time being in use.
The body of the fitting is preferably formed cylindrical in its interior but it may
be formed slightly conical and I fit in the interior of said body a correspondingly
shaped plug into which the lenght of tube in front of the fixing plate is screwed a
suitable slot being formed in the body of the fitting to permit of the required
motion of the same upon the plug.
I preferably form the plug hollow and I close the ends by suitable screw covers
which retain it in position and hermetically close the same..
By these means either the mouth piece or the whistle and indicator can be
placed as may be required in communication with the speaking tube and the opera-
tion is such that by turning the body of the fitting so as to place the mouth piece
in position for use the whistle is removed therefrom and by turning the body so as
to remove the mouth piece from the tube the whistle and indicator are automatically
placed in position for use. When the mouth piece is brought into position for use
the whistle and indicator are placed in a vertical position whereby the indicator is
caused to fall back into position for use when again brought into connection with
the speaking tube.
Dated 1000
COMPLETE SPECIFICATION.
Improvements in Fittings for the Mouth Pieces of Speaking Tubes.
I, GEORGE FREDERICK SHEATH, of 89, City Road,, St. Lukes, in the County
of Middlesex, India Rubber. Manufacturer, do hereby declare the nature of this
invention,, and in what manner the same is to be performed, to be particularly
described and ascertained in and' by the following, statement :-
The end of the speaking tube is furnished with a fitting: carrying the mouth
piece, as also the whistle and indicator, whereby the speaking tube is hermetically
[Urics R

page_text: sealed when out of use and the whistle and indicator at such time brought into
position for use. As heretofore constructed such class of fittings have been
imperfect in their action.
Now the object of my present invention is to so construct such class of fittings
that they shall work perfectly truly and the moving parts be hermetically fitted, so
as to ensure the fullest efficiency in use.
For this purpose I fit the end of the speaking tube on to a metal fixing, having
at the back of the fixing plate, a short length of tube to which the speaking tube
is fitted, and a longer piece of tube in front of the said fixing plate for the purpose
hereinafter described.
The mouth piece and the whistle and indicator are fixed to the moving body of
the fitting, as heretofore, at right angles (or thereabouts) to each other to enable
the one or the other to assume a position opposite the end of the speaking tube,
according to whether the mouth piece is or is not for the time being in use.
The moving body of the fitting is preferably formed cylindrical in its interior,
but it may be formed slightly conical, and I fit in the interior of said body, a corre-
spondingly shaped plug into which the length of tube in front of the fixing plate is
screwed, a suitable slot being formed in the body of the fitting to permit of the
required motion of the same upon the plug.
preferably form the plug hollow and I close the ends by suitable screw or
other covers.
And in order that my said invention may be more clearly understood and readily
carried into effect, I will proceed aided by the accompanying drawings, more fully
to describe the same.
>
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a side elevation, Figure 2 is a plan or top view, Figure 3 is a side
view mainly in section and Figure 4 is a horizontal section of an improved fitting
for the mouth piece of a speaking tube in which the mouth piece is fixed directly
to the fitting, and Figure 5 is a side elevation of a similar fitting in which the
mouth piece is connected to the fitting by a flexible tube.
In all the figures like parts are indicated by similar letters of reference.
a is a fixing plate; on the back of which is a short length of tube a', to which the
main speaking tube is fitted, whilst on the front of such plate is a longer length of
tube a' for the purpose hereinafter described.
The mouth piece band the whistle e with the indicator à are fixed to the moving
body e of the fitting, as heretofore, at right angles (or thereabouts) to each other
to enable the one or the other to assume a position opposite the end of the speaking
tube, according to whether the mouth piece is or is not for the time being in use.
The moving body e of the fitting is preferably formed cylindrical in its interior,
but it may be formed slightly conical, and I fit in the interior thereof a corre-
spondingly shaped plug f, into the front of which the length of tube a² is screwed,
a suitable opening being formed in the body e to permit the required motion of the
same upon the plug f. I preferably form the plug hollow and I close the ends by
suitable screw or other covers into the centres of which the screws g forming the
axis of motion of the moving body e are screwed.
In the construction shown at Figures 1 to 4, the mouth piece bis screwed into the
socket e¹ carried by the moving body e, so as to be rigidly connected thereto and
consequently move therewith. In this case the moving body e is caused to move
with sufficient friction on the plug f to cause the same to remain in the position
shown by the dotted lines in Figure 1 when being used, and yet to permit of the
same being turned down to the position shown in full lines in Figures 1 and 3 when
not in use. In the construction shown at Figure 5, the mouth piece b is connected
with the socket by a flexible tube h, and in such case I prefer to mount the
moving body e loosely on the plug f, so as to permit of free motion thereto, in
which case the mouth piece will automatically assume the position shown at
Figure 5 when not raised for use.

page_text: By the means herein described the mouth piece b, or the whistle c and indicator d,
can be placed as may be required in communication with the speaking tube, and the
operation is such that by turning the moving body e so as to place the mouth piece b
in position for use, the whistle c and indicator d are removed therefrom, and by
turning the moving body e so as to remove the mouth piece from opposite the tube a²,
the whistle c and indicator d are automatically placed in position opposite the
tube a² for use. When the mouth piece is brought into position for use, the
whistle c and indicator d are placed in a vertical position whereby the indicator dis
caused to fall back into position for use when again brought into connection with
the speaking tube.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
The improved construction of fittings for the mouth pieces of speaking tubes,
substantially as herein shown and described.
Doted thin 90th day of Lana 1901
GEO. FRED. SHEATH.
By Harris & Mills,
23, Southampton Buildings, London, W.C., Agents.