Improvements in Electro-telephonic Apparatus.
Year: 1890

page_text: Date of Application, 31st Mar., 1890
Complete Specification Left, 31st Dec., 1890-Accepted, 28th Feb.. 1891
PROVISIONAL SPECIFICATION.
Improvements in Electro-telephonic Apparatus.
I, ERNEST FRANK FURTADO, of 72, Oakley Square, Hampstead Road, in the
County of London, Electrician, do hereby declare the nature of this invention to be
as follows:-
This invention consists in improvements in electric telephones and the object of
the present invention is to simplify the construction and to reduce the cost of
manufacture of such instruments.
According to my invention, I combine the transmitter, receiver and call bell, or
receiver and call bell in such a manner that the essential parts of the telephone are
placed within the gong of the bell in order that the gong may act as an alarm, and
also as a protecting case for the telephone; and to the board, tray box or other
suitable arrangement, against which the telephone is either hung or clamped, to
effect the necessary switch arrangement, is fixed a hammer, or clapper actuated by
an electro-magnet or magnets concealed in recesses formed in the back of the board
or within the tray, box or other suitable arrangement, this ringing apparatus may
be of either of the well known types (viz. single stroke, or trembler) operated by a
push button, or key at the transmitting station.
The hammer or clapper is so placed that when the telephone is at rest upon the
hook, or within the spring clamp or other suitable switch arrangement or mode of
support upon
the base, it shall be in the correct position to strike upon the above
mentioned gong.
Dated this 31st day of March 1890.
ERNEST SALAMAN,
Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Electro-telephonic Apparatus.
I, ERNEST FRANK FURTADO, of 72, Oakley Square, Hampstead Road, in the
County of London, Electrician, 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 consists of improvements in electric telephones and the object of
the present invention is to simplify the construction and to reduce the cost of
manufacture of such instruments.
According to my invention I combine the transmitter receiver and call bell or
receiver and call bell in such a manner that the essential parts of the telephone are
placed within the gong of the bell in order that the gong may act as an alarm and also
as a protecting case for the telephone, and to the board tray box or other suitable
arrangement against which the telephone is either hung or clamped to effect the
necessary switch arrangement is fixed a hammer or clapper actuated by an electro-
magnet or magnets concealed in recesses formed in the back of the board or within
the tray box or other suitable arrangement. This ringing apparatus may be of either
of the well known types (viz., single stroke or trembler) operated by a push button
or key at the transmitting station.
The hammer or clapper is so placed that when the telephone is at rest upon the
hook or within the spring clamp or other suitable switch arrangement and mode of
support upon the base it shall be in the correct position to strike upon the above
mentioned gong.
And in order that my said invention may be the better understood I will

page_text: proceed to explain the same with 'reference to the accompanying sheet of drawings
in which
Fig. 1 represents a sectional elevation. of a telephone constructed according to
this invention suitable for standing on a table desk or the like.
Fig. 2 is an external elevation of the same and.
Fig. 3 is a detail view.
The same letters denote the same parts in all the figures.
a is the gong of the call bell to which gong is attached the telephone coil b. The
mouth-piece c constructed of wood vulcanite or other suitable material has attached
thereto the rings d, e between which the diaphragm fis clamped. To the mouth-
piece c is attached a curved bar g made of metal or other suitable material through
the top of which passes the screw h engaging with the nut i. A spring preferably
of flat metal serves to press the gong downwards towards the diaphragm and the
distance of the pole k of the coil from the diaphragm f is regulated by turning
the nut i.
The stand has attached thereto the bell coil or coils m the armature n of which
is attached to the rod o of the hammer p. 9 and rare metallic rings attached to the
stand between which rings is the moveable plate s normally forced upwards by the
springs t, t so as to rest against the ring 9 but when the receiver is in the position
shewn the weight of the call bell and receiver depresses the said plate causing it
to make contact with the ring r. u is a metal contact piece normally in contact
with the binding screw v. to is another contact piece. x is a push button the stem
of which if of metal terminates in an insulating material.
The wiring of the instrument is as follows:--
1 is line wire, 2 wire from battery, 3 wire to earth and battery, 4 and 5 receiver
wires, the wires being shewn separately for sake of clearness instead of twisted
into a cord as usually done.
When the receiver is placed on the stand in the position shewn in the drawing
a circuit is established from line through contact piece u screw plate s ring r and
bell coil m to earth by means of wire 3 so that on a person at the transmitting
station pressing the button x the gong is sounded. When the person at the receiving
station takes up the receiver the plate s rises and presses against the ring thereby
switching off the bell circuit and establishing a circuit from line through contact
piece u binding screw plates ring q wires 4 and 5 to battery wire 2.
When the button x is pressed a current is sent from battery through contacts u
and w to line round bell coil at the station with which communication is desired to
earth and battery sounding gong at that station.
In applying this invention to permanent magnet receivers the iron band g would
be replaced by two stout magnets each of suitable shape with their like poles to the
centre and the diaphragm constructed of iron plate.
For instruments of the English mechanic type the gong a should be made
of steel.
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 :-
(1) In electro-telephonic apparatus the combination of a gong forming a case or
cover for the telephone mechanism with a means of sounding the said gong substan-
tially as described-and-shewn.-
(2) In electro-telephonic apparatus arranging the gong of the call bell in the
manner shewn for the purpose specified.
Dis oorn day of December 1890.
ERNEST SALAMAN,
65 and 66, Chancery Lane, London, Agent for Applicant.