Year: 1898

page_text: A communication from abroad by ALLEN THOMAS NYE, of No 36, West 120th
Street, New York, in the United States of America
I, PHILIP MIDDLETON JUSTICE, of 55 and 56, Chancery Lane, in the County of
Middlesex, Fellow of the Chartered Institute of Patent Agents, do hereby
declare the nature of this invention to be as follows
This invention relates to the instruments such as those through which the
subscribers of a telephone system receive their messages. As is well understood,
it is necessary that the magnet of such an instrument shall be capable of adjust-
ment toward and from the diaphragm and that the magnet shall be securely
fastened in position when it has been adjusted It is desirable also to provide
against expansion of the magnet cores by the heat of the hand in handling the
instrument and also to guard against the transmission of electric shocks to the
person handling the instrument. It is proposed to attain these objects in the
manner hereinafter described
The shell or casing of the receiver, in accordance with this invention, 18 made
wholly of rubber or other suitable non-conducting material and has an interior
space or chamber of sufficient size to receive the magnet without touching the
same at any point, whereby the natural warmth of the hand is prevented from
affecting the magnet Embedded in the wall of the shell near the end which
receives the diaphragm and encircling the central chamber is a thimble which 18
internally screw threaded and is provided also with an in-turned flange The
magnet is provided at a corresponding point with an encircling collar which is
screw threaded to engage the interiorly screw threaded thimble above referred
to and is also provided near its circumference with several, preferably four, set
screws which are parallel with the axis. These set screws are extended through
the said collar, their heads being accessible from the open end of the shell when
the diaphragm has been removed in the usual manner, while the points of the
screws are arranged to bear upon the in-turned flange of the thimble above
mentioned. Thus the magnet can be adjusted toward and from the diaphragm
by rotating it with its collar within the interiorly threaded thimble and can then
be secured firmly to its adjusted position by setting up the screws aforesaid until
they impinge upon the flange above mentioned and so cause the collar to bind
within the thimble and the further rotation of the collar and the magnet to be
prevented. It will be observed that if the shell is made wholly of rubber or
other non-conducting material, the transmission of shocks 18 avoided.
1000

page_text: A communication from abroad by ALLEN THOMAS NYE, of No. 36, West 120
Street, New York, in the United States of America
I, PHILIP MIDDLFION JUSTICE, of 55 and 56, Chancery Lane, in the County of
Middlesex, Fellow of the Chartered Institute of Patent Agents, 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:
This invention has relation to the means for supporting the magnet of a
telephone receiver within its shell or casing. One object of the invention 18 to
make the magnet easy of adjustment toward and from the diaphragm, and at the
same time to provide for fastening the magnet securely in position when it has
been adjusted Another object is to guard against expansion of the magnet cores
and consequent loss of adjustment by the heat of the hand in handling the
instrument, as well as to prevent the transmission of electric shocks to the person
handling the instrument
In accordance with this invention the shell or casing of the receiver is made
wholly of rubber or other suitable nonconducting material and has an interior
space or chamber of sufficient size to receive the magnet without touching the
same at any point. An internally threaded sleeve is securely fastened to or
embedded in the wall of the shell or casing, preferably near the end which
receives the diaphragm, encicling the central chamber, and provided with an
inwardly projecting flange An encucling collar secured to the magnet at a
corresponding point is screw threaded to engage the interiorly threaded sleeve
or thimble above refened to and is provided near its circumference with one o
more set screws parallel to the axis and ananged to impinge upon the flange of
the sleeve or thimble, their heads being accessible from the open end of the shell
when the diaphragm has been removed in the usual manne When the magnet
has been adjusted in position by rotating it with its collar within the interiorly
threaded sleeve or thimble, the set screws are turned until they bear upon the
flange and so cause the collar to bind within the thimble and its further rotation
to be prevented
The invention is illustrated in the accompanying drawing in
which,
Figure 1 is a longitudinal central section of the receiver constructed in
accordance with the invention,
Figure 2 is an end view of the same with the diaphragm and cap removed;
Figure 3 is a detail view partly in section of the sleeve secured to the shell or
casing;
Figure 4 shows in detail the threaded collar which supports the magnet, and
Figure 5 shows in detail the carrier block for the magnet.
In the construction represented in the drawing, a shell or casing or holder of
hard rubber or other suitable material, and of usual or suitable form and con-
struction except as hereinafter indicated, 18 represented at A The diaphragm B
is applied to the enlarged end of the shell or holder and is secured in place in the
usual manner by the cap or cover C Within the shell or holder and encircling
the central chamber thereof, preferably near the enlarged end, is an interiorly
threaded sleeve or thimble 1), being held securely in place in any suitable manner,
as by having the shell cast or molded about it This sleeve or thimble 18 also
provided with an inwardly turned flange d for a purpose presently to be described

page_text: The magnet E, of any usual or suitable form, is supported by a ring carriei F
which is exterioily threaded to engage the threaded sleeve or thimble D, so
that by rotation of the magnet with the carrier within the sleeve or thimble the
distance of the poles of the magnet from the diaphragm B can be adjusted. It is
necessary that the parts be held firmly and securely in their adjusted positions and
for this purpose the ring carrier F is provided with one or more set screws f,
parallel with the axis and arranged to bear upon the flange d of the sleeve or
thimble D. The heads of these screws are readily accessible when the diaphragm B
and cap or covei C are removed, and by setting them up after adjustment of the
magnet until their points impinge upon the flange d, the carrier F is made to
bind within the said sleeve or thimble and is securely held against further rotation
in either duection For convenience in construction a clamping block or holder G
18 provided for insertion between the arm of the magnet E, being cut away as at g
on opposite sides to receive the respective arms of the magnet, and having its sides
curved in the aic of a circle to fit tightly within the carrier F A bolt G¹ may be
passed through the arms of the magnet and through said block or holder to bind
all firmly together
It will be observed that the magnet 18 out of contact with the shell or casing A
throughout its length and 18 supported near the diaphragm only, so that it 18
thoroughly insulated from the heat of the hand when the receiver is in use
and its adjustment is therefore not likely to be affected In the same manner,
also, the person using the instrument is protected from the transmission of electrie
shocks, there being no metal whatever exposed for contact The connecting wires
are led through a hole formed for the purpose in the end of the shell or casing and
are connected directly with the wires of the magnet coils
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, as communicated
to me oy my foreign correspondent, I declare that what I claim 18.
1 In a telephone receiver, the combination with a shell or casing and a
magnet, of a sleeve or thimble secured to the shell or casing and encircling the
central chamber, said sleeve or thimble being interiorly threaded and having an
inwardly turned flange, a carrier for the magnet exteriorly threaded to engage
said sleeve or thimble and set sciews carried by said carrier and a11anged to
impinge against said flange, substantially as shown and described.
2 In a telephone receiver, the combination with a shell or casing and a
magnet, of a sleeve or thimble secured to the shell or casing and encircling the
central chamber, said sleeve or thimble being interiorly threaded and having a
inwardly tuned flange, a carer for the magnet exteriorly threaded to engage
said sleeve or thimble, set screws in said carrier arranged to impinge against
Baid flange, and a clamping block or holder for the magnet slotted to receive the
arms of the magnet and formed to fit tightly within said carrier, substantially as
shown and described
T
1 11
1000