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Патент USA US2134691

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Nov. 1, 1938.
H. R ALLENSWORTH
' .
‘ ‘2,134,691
ELECTRIC COMMUNICATION NETWORK
Filed July‘ 13,‘ 1957
INVENTOR
HARRY R ALLENSWORTH
BY 1%! 29M
ATTORNEY
2,134,691
Patented Nov. 1, 1938
PATENT OFFICE
UNITED»
2,134,691;
ELECTRIC COMMUNICATION NETWORK
Columbus, Ohio ‘
weenie-aw 1,32 1937; SWIM-315.3341
'
‘9.1Claimsa (01. 179-81)
This invention relates to a new and improved associated shunt contacts SH, polarized‘ ringer
electric communication network and" more pare or hell B‘and hook switch HS with associated
ticularly“to a communication‘ network", or‘ that contact springs 8 and 9. Calling device CD with
‘
part‘ of a communication‘ networkcomprising a
5 telephone transmitter, a telephonereceiver, a
associated shunts, ringer. B and hook switch HS
are'not, per se, a part‘ of the invention. Calling
transformer (induction coil)_"and two condensers device CD with associated shunt contacts is
HO
(capacitors) and has“ for its‘ object‘ a‘ new‘ and
improved“ combination of these‘ elements in, an
electric network, functioning‘by' means of elec
tromotive‘ force,'the source ‘of ‘which electroinoe
tive‘ force‘ is external‘ to‘ the electric‘ network
comprising the ‘said telephone transmitter, re
ceiver, transformer and‘condensers.
‘ ‘ '
A conventional‘ telephone ‘network comprises
15 a three winding transformer, a‘transmitter, con‘
denser and an ‘inductively coupled, receiver“ to
gether with suitable‘ switchesand signaling and
calling devices. The condenser and two wind
shown for the purpose of' revealing certain im
portant characteristics of the network. Hook
switch HS and polarized ‘ringer B are shown for
may be, a telephone ‘line terminating in a coin
mon battery telephone switchboard or other
common battery switching mechanism-fit‘ may
be a ‘circuit to another telephone ‘not ‘connected
ings of the transformer are‘ inyserie's‘e-one of
to or with an exchange system, in which case
electromotive force is‘impressed on the circuit
at some convenient point external to the net
20 which‘two windings ‘being connected acros‘s‘the
terminals of the‘transmitter, directly on Jone side
and in series with the‘ condenser “on ‘the other;
The third winding together with the receiyer-i‘n
ploy for telephonic, purposes by means of the
series‘ form an‘ inductively coupledfse‘condary
25circuit,
,
To‘ my knowledge there‘ has not been prior to
this ‘inv-entionan electric ‘communication net:
work, telephonic ‘or otherwise, comprising four
10
the purpose of explaining the function and ac
tion of contact springs? and 9,.‘
The source of ‘electromotive force LI, and L2
work herein describedf-it may be a telegraph or
other signal circuit-it may be any suitable elec
tric circuit which it may be practicable to em
network herein described;
'_
Electromotive forceffrom the source, LI and 25
L2- is impressed on the circuit or network at
points 4‘ and‘ 5‘ causin'gielectric' current to ‘ flow
through P2, T. The divided‘ circuit 4, Pl, Ci,
transformer windings‘—three of said‘ windings
30 being primary to the" fourth-—a'telephonetrans
P3,, 5; 4, P2‘, T, 5_ is‘ bridged, by a ‘condenser C
mitter, a telephone receiver, and‘ two condensers;
said‘network being divided intoftwo parallel cir
All four transformer windings Pl’,,P2, P3‘ and
cuits bridged by one of ‘said condensers. V '
at points 6 and 1.
'
S“ are on the same magnetic core.
‘
The operation of this circuit or network, dUI-r
‘
The invention will be best understood‘ from, a
consideration of the following‘ detailed descrip
tion‘ taken in, connection with the] accompany-,
ing‘drawing forming a part of ‘this application;
with the understanding, however, that thein
vention is not con?ned‘ to the one practical ap
40 plication herein selected forpurposes' of illusy
tration nor is the invention, con?ned to any
strict conformity with theshowing of, the draw‘
ing speech transmission is as ‘follows.
‘
The line circuit Ll, L2 which ‘supplies direct ‘
current from‘ a central oflice battery, or other
suitable source, divides into two parallel‘ circuits
at points 4 and 5; one of the two parallelcirw
cuitscomprising transmitter T and‘PZ inseries
the other, comprising Pl, CI andv P3 in series. 40
Battery ?ows in that branch of the divided ciré
cuit comprising P2, T; the other branch of the
ing which may be changed or modi?ed‘so'long
divided circuit being.“op‘en’l’ to: direct current
as ‘such changes and/ormodi?ca'tions mark no
because of condenser Cl being in series withPl
45 material departurevfrom the salient features of
the invention‘within the scope‘ ofthe appended
claims.‘
'
‘
‘ “
30
‘I
The accompanying drawing is a schematicdee
lineation, by means of conventional symbols, ‘of
‘ 50 a useful and practical application. of the inven
tion‘in the form ofa telephone subscriber’slstae
tion network comprising eightrmembers or, parts
to wit; a sourcejof electromotive fOrce-hererérie
resented'by‘two ‘sides of a line, Ll?and. L2,; a
55 telephone‘transmitter T; transformer] windings
Pl, P2 andP3; bridgingconden‘ser C; series con’
denser Cl and an inductively coupled secondary
circuit comprising transformer winding S and
telephone receiver R. Also are shown, by means
60 of conventional symbols, ‘calling device CD with
and‘PB.
‘
‘
'
Another circuit, local. to the network, in the
form here, shown, comprises transmitter T, con
densers Cgand Cl‘ and transformer windingv P3.
It‘ should be noted however, that the position of
condenser Cl is not ?xed byeither this} descrip
tio‘nor the drawingherein, Condenser CI_ may
betplaced at any convenient andpractical point
inthat branch of the, dividedcircuitde?ned by
4, Pl, 1, P3, 5.
‘
_
‘When the transmitte'nT functions‘ invr'esp'onse.
to‘ sound waves, ‘corresponding potential undula
tions are produced directly in the line through
transmitter T and winding P2. Condenser C is
connected across the terminals of transmitter T
directly on one side and through condenser Cl 60
2,134,691
and winding P3 on the other.
Condenser C
charges and discharges due to varying potential
drop across transmitter T. This causes P3 and
PI to function as an auto transformer in which
circumstance PI is, secondary to P3. The cur
rent ?owing in the said local,v circuit divides at
the point ‘I; part ?owing through Cl, P3 and
part through Pl.
Thus the inductive effect of
P3 on’ S is neutralized more or less depending
10. on the relative proportions of PI, P2 and P3;
an effect known to the art as “anti-sidetone”.
Also, ‘Pl functions as an inductively coupled feed
back on P2 producing improved booster char»
acteristics in the network. 'As herein before
stated, Cl may or may not be comprised in said
local circuit.
sponding alternating current to ?ow in PI, Cl,
P3 in which circumstance Pl, P2 and P3 are
primary to S and corresponding alternating
FL is induced in, S causing alternating cur
rent to flow in S and receiver R.
When calling device CD is operated—ass,ociated
shunt contacts SH close, shunting transmitter T
Inasmuch as S is
' secondary to PI, P2 and P3-—shunting S during
the operation of CD lessens the impedance of
PI, P2 and P3 to current impulses produced by
CD.
.
Condenser C is shown bridging the network at
points 6 and ‘I. Condenser Cl is shown in series
4. An electric communication network in which 10
both anti-sidetone and booster characteristics are
incorporated by dividing the said circuit or net
. work into two parallel circuits, one of which par
allel circuits comprises a telephone transmitter in
series with one winding of a transformer having
cuits comprises two of said windings and a con
denser in series relation therewith, and a con
denser bridging said circuits at points of approxi
mately equal potentials.
20
5. An electric communication network compris
ing two parallel circuits, one of the two parallel
circuits comprising a telephone transmitter in
series with one winding of a transformer having
four windings, the other of the said parallel cir
cuits comprising two of said windings and a con~
denser in series, the total impedance offered by
said parallel circuits to pulsating current set up
in said network being reduced by short circuiting
a transformer winding said short circuited trans
former winding being secondary to the three said
transformerwindings comprised in the said two
parallel ‘circuits.
prising a transformer having four separate wind
employ two separate condensers inv the network.
C and CI may be, in some instances,‘two sections
ings, three of said windings being primary to the
fourth, two parallel circuits, a condenser bridg
of a dual condenser.
ing said parallel circuits and a condenser in one
of said parallel circuits in series with two of the
,
‘ When HS is up C, by means of 8 and 9, bridges
the network at points 6 and ‘l as is shown.
Thus the said eight members or parts as assem
bled and combined in the invention effect the fol
lowing improved results over other such net
works; lessened impedance to dialing, impulses,
improved booster effect together with anti-side
tone characteristics and high ?delity transmission
and reception.
.
What is claimed is:
' 1. An electric communication network com~
prising two parallel circuits, one of the two par
allel circuits comprising a telephone transmitter
7. An electric communication network compris
ing two parallel circuits and a transformer having
four windings, one of said parallel circuits com
prising a telephone transmitter and one of said
transformer windings in series relation therewith,
the other of the two parallel circuits comprising
two of said windings and a condenser in series
relation therewith, said parallel circuits compris
ing a local circuit including said telephone trans
mitter.
,
8. An electric communication network com
prising two parallel circuits and a transformer
having four windings, one of said parallel circuit-s
comprising a telephone transmitter and one of
former having four windings, the other of the
said parallel circuits comprising two of said wind
said transformer windings in series relation there
with, the other of the two parallel circuits com
prising two of said windings and a condenser in
series relation therewith, a condenser bridging
said parallel circuits; said parallel circuits com
prising a local circuit including said telephone
transmitter and said bridging condenser.
point between the transmitter and transformer
winding in one of said parallel circuits to a point
' between the two transformer windings in the
other of the said parallel circuits.
' 2. An electric communication network compris
ing two ‘parallel circuits, one of the two parallel
circuits comprising a telephone transmitter in
series with one winding ofra transformer having
four windings and the other of the said parallel
circuits comprising two of said windings and a
condenser in series relation therewith, the said
three windings in the said parallel circuits being
primary to said fourth'winding.
3. An electric communication network com
35
aforesaid windings.
in series relation with one winding of a trans
ings and a condenser in series relation therewith
vand a condenserjbridging saidcircuits from a
30
6. An electric communications network com
relation with PI and P3; Itis not necessary to
When hook switch HS is down contact springs
8 and 9 put C in series with B across Li and L2.
‘
in series with one winding of a transformer hav
ing four windings; the other of the two parallel
circuits comprising two of said windings and a
condenser in series, and a’telephone receiver in
series with said fourth winding forming an in
ductively coupled circuit, secondary to the three
said transformer windings.
four windings, the other of which parallel cir
7
When the transmitter at the distant station
functions, potential undulations from LI and L2
are impressed at points 4 and 5 which causes
un’dulatory current to ?ow in P2, T and corre
, and transformer winding S.
prising two parallel circuits, one of the said par
allel circuits comprising a telephone transmitter
9. An electric communication network com
prising two parallel circuits and a condenser
bridging said circuits, one of the two parallel cir
ciuts comprising a telephone transmitter in series
with one winding of a transformer having four 65
windings, and one of said parallel circuits com
prising a condenser and two of said windings in
series, the three windings in the said parallel cir
cuits being primary to a fourth connected directly
to a telephone receiver.
'
HARRY R. ALLENSWORTH.
70
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