Improvements in and connected with Telephonic Apparatus as Adapted to Mining and other Purposes.
Year: 1895

page_text: Date of Application, 1st.Jan., 1895
Complete Specification Left, 30th Sept., 1895-Accepted, 2nd Nov., 1895
BUY DIUNAL DE TOATTN
Improvements in and connected with Telephonic Apparatus as
Adapted to Mining and other Purposes.
I, MAX BINBWANGER, of 69-71 Queen Victoria Street, in the City and County
of London, Electrical Engineer do hereby declare the nature of this invention
to be as follows :—
My invention relates to certain improvements in and connected with telephonio
apparatus as adapted to mining or kindred purposes, where rough usage, dust and
damp air would render an ordinary telephone useless in a comparatively short space
of time.
In carrying my invention into effect, I preferably mount the whole of the
mechanism of the transmitter upon a single slab of insulating material, fixing this
within a metallic box, which when the cover is screwed or otherwise fixed, causes
said mechanism to be hermetically sealed; an indin rubber or other resilient liner
being interposed between the surfaces of the joint. The mouth piece proper, or
trumpet of the transmitter is made so as to impinge upon the under side of the lid
or cover, opposite a hole therein, in which is fitted a diaphragm of ferrotype plate,
or similar material, which is protected outside the instrument by a stout wire
netting, or perforated metallic cover. The conductors are contained in a flexible
tube of metal, or any insulating elastic material, and pass into the box or case
through glands and stuffing boxes, or cord grips, so that dust and moisture may be
excluded, and any external strain imposed upon said conductors is transferred to
the gland or grip, and does not tend to injure the connections at the terminals or
binding screws. The hook contact, upon which the receiver hangs when not in
use, is provided with a collar and washer inside the box or case, so that when
depressed by the weight of said receiver the washer is compressed and effectually
closes the orifice through which said hook passes. A similar collar and washer
outside the box or case is attached to the shaft of the hook so that the tension of
the spring compresses the washer and closes the orifice from outside when the hook
is released from the weight of the receiver. The push for actuating the call bell
contacts is fitted upon the lid of the box or case, and passes through it as a packed
plunger. I do not confine myself to the exclusive use of any type of telephonic
transmitter or receiver, nor to the device of fixing the mechanism of the
former upon a single slab of insulating material, although this method is
preferable.
The receiver is enclosed in a metal case, and a stuffing box and gland or cord
grip prevents strain and possible injury to the conductors, and also excludes dust
and moisture. Said conductors are also enclosed within a flexible insulating or a
metallic tube, which by its flexibility allows of the free use of the receiver in the
ordinary manner, yet protecting the enclosed conductors.
I may vary the details in construction without departing from the essential
features of my said invention.
Deted this 1et der of Januar 1905.

page_text: COMPLETE SPECIFICATION.
Improvements in and connected with Telephonio Apparatus as
Adapted to Mining and other Purposes. -
I MAX BINSWANGER of Nos. 69-71 Queen Victorin Street in the City and
County of London Electrical 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 aud by the following statement:-
My invention relates to certain improvements in and connected with telephonic
apparatus,as adapted to mining or kindred, purposes, where rough usage, dust, and
damp air, would render an ordinary telephone useless in a comparatively short space
of time.
In order that my said invention may be the better understood I have appended
the accompanying sheet of drawings, in which
Figure 1 is a front elevation of the transmitter and case with the cover
removed.
Figure 2 is a longitudinal section thereof, showing the cover and transmitter
in place.,
Figure 3 is an elevation of the protective covering for said transmitter, partly
broken away for sake of convenience.
2.
Figure 4 is an elevation partly insection of the receiver.
Similar letters of reference indicate corresponding parts throughout the several
views. Such parts pertaining to any ordinary telephone, and which are not modified
to suit, nor form any part of my said invention are not lettered, nor referred to in
the description thereof.
"
"
In carrying my invention into effect preferably mount the whole of the
transmitter mechanism upon a block A of insulating material; fixed within a
metallic box B, which is provided with a cover a fitting upon a flange b forming
an integral part of said box B. A thin washer of india rubber or other resilient
material may be placed between the cover a and the flange b so as to be compressed
when the screws & are tightened, and thus form an air and water tight joint. The
diaphragm d is preferably mounted upon ap elastic washer, and secured to the
inside of the cover a by a metal ring e, held by screws f. Outside said diaphragm d
a protective covering g, of stout metal gauze, or perforated sheet metal, is fixed by
means of a ring. The front elevation of this part of the device is shown by
Figure 3. The conductors are enclosed within flexible metallic tubing C, the'ends
of which are soldered to screwed nipples D, with a fixed collar F, and a screwed
collar, or out E, which provides a secure and air or water tight joiut, and at the
same time relieves the enclosed conductors of any strains or risk of damage by
rough or careless usage. 1 may use a stuffing box and gland, or any equivalent
device in lieu of the foregoing for attaining the same result.
The book contact G, upon which the receiver bangs when not in use, passes
through an elastic or resilient washer H, which may be cupped or internally recessed
so as to embrace the spindle or rod G more closely. Or I may place two collars
upon G, so that the internal collar tightly closes the orifice when G. is depressed by
the weight of the receiver, and the external collar performs the satne function
when G is released, and placed into contact position by the tension of the spring. The
push for actuating the bell contact may be fitted with a gland and stuffing box,, or
a simple washer as herein before described. All openings for wires, moveable
contacts or the like are protected against the admission of dust, water or damp air,
so that the operative mechanism is practically hermetically scaled. I do not confine
myself to the exclusive use of any type of telephonic transmitter, or receiver, nor
to the method of fixing the mechanism of the former upon a single slab of insulating
anaterial, although this method is preferable.

page_text: The receiver R, Figure 4, is entirely enclosed within a metal case i to the lower
extremity of which is attached the ear conej holding the diaphragm d in position.
A cap k, screwed upon the upper extremity of said case i, encloses the contact
screws m and carries the suspension loop 1, and the conductors are enclosed within
the flexible metallic tube C which is attached to k by the collar or nut E and
nipple D in the manner herein before described. The flexibility of the tubing C
allows of the free use of the receiver in the ordinary manner.
I do not confine myself to the exact shape or conformation shown by the drawings
but may modify this to suit various cases of adaptation.
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 ;-
First. The construction and employment of a metallic case enclosing a telephonic
transmitter and accessories, with devices for excluding dust and water, substantially
as herein described with reference to Figures 1, 2, and 3 of the appended
drawings.
Second. In telephonic apparatus the method of and means for enclosing the
flexible conductors within a flexible metallic sheath, and attaching the same at the
terminal ends substantially as and for the purposes herein set forth and shown by
the appended drawings.
Third. In telephonic apparatus the employment of a metallic case enclosing
a receiver, in combination with a flexible metallic tube containing the conductors,
and means for attaching same, substantially as and for the purposes herein described
with especial reference to Figure 4 of the appended drawings.
Fourth. The method of, and means for hermetically sealing the mechanism
of a telephonic transmitter and a receiver in connection therewith, substantially as
herein.described and shown by the accompanying sheet of drawings.
Dated this 27th day of September 1895:
FREDK. WALKER,
73 St. Stephen's Road, Upton Park, London, E., Agent for the Applicant.