Wireless Break-Key Page: 4 of 5
2 sheets, 3 p. : ill. ; 23 cm.View a full description of this patent.
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1,048,849
vided with platinum points 9' and mercury
10' and a suitable cup therefor 11'. The
mercury cups being suitably secured to the
insulating base 1 and provided with ter-
5 minals for the connection of the. circuit
wires, as is clearly shown in the drawings.
Mounted on the upper portion of the in-
sulating block 13 is a strip of metal 14 elec-
trically connected with one of the contact
10 members. This strip of metal being ar-
ranged to come in contact with a Z-shaped
conductor 15 fastened to the base, and
slightly to one side of this portion of the
key, and so that the piece 14 will come in
15 contact therewith when the head 7 is de-
pressed by the operator.
16 is a suitable binding post disposed on
the Z shaped member 15 so that the latter
can' be electrically connected to the circuit
20 wires.
Electrically connected to the other con-
tact member which is disposed on the block
13 is a flexible connection 17 that is suitably
connected with the line wires of the circuit.
25. . Referring to the modification shown in
the contact points, which are merely-solid
pieces of metal, and arranged for those con-
ditions where the mercury contact is not de-
sirable and might prove objectionable, or
80 where it is desired to cheapen the instru-
ments.
While platinum has been referred to as
the metal particularly desirable for the pur-
pose of making the contact, it is of course
35 understood that there are metals of a similar
nature that can be used for the same pur-
pose, and also that various other contacts
can be arranged for, as is well .known to
those.familiar with the art.
40 Referring particularly to Fig. 4, 18 is a
transformer, 19 a condenser, 20 represents a
sparkgap, 21 a helix, 22 a suitable single-
pole double-throw switch, that is suitably'
connected to an aerial 23; 24. is .a ground
45 wire that has a conductor connected to it
that runs to the flexible contact 17, through
the fuse 25. 26 denotes the tuning coil and
27 a detector, that has suitable telephone re-
ceivers 28 connected thereto, in the usual
50 manner.
From the diagram shown, it is understood,
that the connections are made in the usual
manner and that it is not necessary to go
into details and describe each particular
55 part of the apparatus, as this invention does
not cover them in any way, otherwise than
described above, and in the appended claims,
and also that this particular system is only
shown by way of' example,'in order to ex-
60 plain more fully the operation of this de-
vice. By suitably modifying the connections
to this break key it can be connected to prac-
tically any wireless system, and prove ad-
vantageous to use in them all. The connec-
65 tions arranged for the various parts of' thekey are preferably made so that they will be
inconspicuous or concealed, or in any' way
suitable for the conditions arising. The gen-
eral connections,. however, being made to the
various-parts of the key, as is noted in the 70
diagrammatic drawing.
In operation the .operator depresses the
head 7 of the key and causes the current to
flow through the terminal 2 of the lever 3
thence to the contact member 8 and thence 75
to the circuit connected with the trans-
former, so on back to the source of current.
This depression of course, energizes the
transformer and sends the messages to the
aerial and to the space beyond it. As this 80
depression of the key is made,_contact is
broken between the points 9' and 10' in the
members disposed at the other end of the
key, these break the receiving circuit and
prevent the operator from receiving the mes- 85
sages that he is sending out, which often is
the cause of burnt up instruments, or injury
to the former,' at the same time any other
messages being sent by another party are cut
off from the operator. As the outer portion 90
of the key arises, the strip of metal 14 comes
in contact with the Z shaped member 15 and
the current therefrom flows through the lat-
ter, through the circuit wire, attached there-
to,' which can be easily followed 'in the dia- 95
gram, and which assists in the transmission
of the message to the aerial.
When the operator permits the key head
to rise under the action 'of the spring 3'
which is disposed adjacent to the head 7, it 100
brings the contact members 8' and 10' to-
gether and completes the circuit for receiv-
ing, and at the same time the circuit that re-
ceives the current from the main source of
current at this station is opened and does not 105
flow through the transformer thus enabling
the operator to, receive any messages being
sent to him, and eliminating any possibility
of his transmitting apparatus interfering
therewith. 110
Obviously while there is shown but one
modification of the construction of this in-
vention in the drawings, it is not desired 'to
limit this application for a patent in any
way, otherwise than is necessitated by the31
prior art, as maiiy modifications in the con-
struction of th is invention may be made
without departing. from the principles
thereof.
Having thus described this invention it is 120
claimed:
A key for wireless telegraphy comprising
in combination a lever for opening and clos-
ing the transmitting and receiving circuit 125
and a cap disposed on said lever for the con-
venient actuation of said lever and a contact
member disposed at one end of said lever
and arranged tomake and break a contact
under said cap, an insulating piece disposed 130
at the other end 'of said lever, a plurality of
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Reference the current page of this Patent.
Mobley, Grier P. Wireless Break-Key, patent, December 31, 1912; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth508732/m1/4/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.