Improvements in or relating to Telephone, Speaking Tube, and like Receivers.
Year: 1899

page_text: Date of Application, 6th Sept., 1899
Complete Specification Left, 26th Mar., 1900-Accepted, 7th July, 1900
PROVISIONAL SPECIFICATION
Improvements in or relating to Telephone, Speaking Tube, and like
Receivers.
I, HAHNEMANN ADOLPHUS CUTMORE, of 12, Rembrandt Road, Lee, in the
County of Kent, Engineer, do hereby declare the nature of this invention to
be as follows:
This invention relates to receivers for telephones, speaking tubes and the
like. My object is to furnish each receiver with an attachable contrivance formed
with two peculiarly shaped flexible annular flanges projected from a suitable
base and constructed in such a manner as to entirely exclude all extraneous
sounds when placed to the ear.
To effect this object I form of indiarubber or other suitable elastic material
an ear piece to fit into or over the ordinary receiver. Said ear piece is pro-
vided with a diaphragm or base corresponding in size and shape with the
receiver and having a central aperture therein. Around this diaphragm or
base is a suitably shaped annular flange having a bead or ridge around the edge.
A flared-mouthed flange connected at one end with the base beforementioned
curves slightly over the first named flange and has also a beaded rim so that
when the ear piece is pressed against the ear the two flanges bind together and
thus form a chamber. The particular formation of these flanges cause the
sounds received from a wire or tube as the case may be, to be directed into
the ear, at the same time prevent extraneous sounds from entering the receiver
when in use.
A metallic trumpet is suspended from the base aforesaid so as to intensify the
sounds received.
COMPLETE SPECIFICATION.
Improvements in or relating to Telephone, Speaking Tube, and like
Receivers.
I, HAHNEMANN ADOLPHUS CUTMORE, of 12, Rembrandt Road, Lee, in the
County of Kent, Engineer, 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 relates to receivers for telephones, speaking tubes and the
like. It consists in furnishing each receiver with a contrivance which is so

page_text: constructed that when pressed against the ear excludes all extraneous sounds
and in the case of telephones also renders the sounds received more audible.
In the accompanying drawings Figure 1 is a sectional view of my receiver
attachment, and Figure 2 is an elevation, on a reduced scale of a commonly
used combined receiver and transmitter, with the attachment on the receiver.
According to my invention I form the receiver attachment in two principal
parts (A) and (B) both of which are made of india rubber or other suitable
elastic material.
In the part (A) is a circular diaphragm or base (C) which is of corresponding
size with the receiver, with which the contrivance is used. Around said dia-
phragm is a flange (1) having a bead or ridge on its edge, while on the opposite
side of the diaphragm is a sleeve (E) which fits upon the receiver. In lieu of
this sleeve I may use any other suitable means for attaching the contrivance to
the receiver.
The part (B) curves outward from the hollow neck (F) which is retained in a
central hole formed in the diaphragm (C) by the flanges (G) and (H).
The said part (B) has a beaded rim (1) which extends over and grips the rim
of the flange (D), thus forming an annular air chamber (J). Said chamber when
the contrivance is in use, being mechanically closed, is non-collapsible.
A metallic flared-mouth tube (K) is inserted in the throat of the neck (F).
This tube is held in rigid contact over the opening in the receiver to the
diaphragm therein, so as to allow the sounds to pass direct from the receiver to
the ear clear and distinct.
The contrivance fitted upon a receiver, in use, is pressed firmly against the
ear, the curved surface of the part (B) adapting itself to the irregularities of
the ear, and thus practically seals the ear and thereby prevents the entrance of
extraneous sounds.
I find that the contrivance in use upon telephone receivers especially of the
class illustrated in Figure 2 renders the sounds received at the distant terminal
much more audible and distinct even without a contrivance on the receiver
thereat, and also destroys the intense resonance in the receivers.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
1. An attachable contrivance for telephone, speaking tube and like receivers,
constructed in the manner substantially as and for the purposes herein set forth.
2. In attachable contrivances for telephone, speaking tube and like receivers
the non-collapsible air chamber (J) formed substantially as herein set forth,
and as illustrated.
3. An attachable contrivance such as herein described for telephone receivers
of the class illustrated in Figure 2 for rendering the sounds transmitted through
the telephone while the contrivance is on the receiver, more audible and distinct
at the distant terminal, even without a contrivance on the receiver thereat.
Dated the 26th day of March 1900.
W. D. ROWLINGSON,
7, Quality Court, Chancery Lane, London, W.C..
Agent for the Applicant.