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Патент USA US2109602

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Mar<§h1,1938.~
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2,109,602
CONVECTION DEVICE FOR LOUDSPEAKERS
Filed'Aug. 8, 1936 -
e
OUTPUT
FROM
' POWER
AMPLIFIER
_ C
STAGE
\NVENTOR
OTTO WE|SS
ATTORNEY
Patented Mar. 1, 1938
2,109,602
UNITED STATES PATENT OFFICE
Otto Weiss, Berlin, Germ any, assignor to Tele
i’unken Gesellsehai't fiir Drahtlose Telegraphic
. m. b. 11., Berlin, Germany, a corporation 'of‘
Germany
Applicatgn August 8, 1936, Serial No. 95,043
Germany August 16, 1935
(Cl. 179-1)
_, In receivers with built-in loudspeaker it is‘ de
‘sirable to provide a connection for an additional ?rst speaker, or both speakers simultaneously.
6Claims.
loudspeaker operating at a distance’ from the re
ceiver. An especially simple possibility of switch
5 ing will thereby be of advantage.
In accordance with the invention, at least two
’ pairs of sockets are provided at the receiver, the
one of which being connected to a. switch which
when using this pair of sockets, disconnects the
10 loudspeaker ordinarily connected to the ‘ampli
fler and built-in for instance in the radio appa- '
ratus.
-
.
Figure 1 shows the circuit. From one end of
the secondary winding of the output transformer
15 T a. line passes across the oscillatory coil 3 of the
built-in loudspeaker, to the contact I of the
switch i-2 of the connection device A. The
other winding end of the transformer T is ‘con
nected to the sockets 5 and 4 of the connection
20 device, while a tap t of the transformer T is
connected to the contact 2 of the switch and to
the sockets 3 and 6.
In the latter condition of operation, the voice
coils of the speakers are energized from their re
spective halves of the transformer secondary.
In the operation of one loudspeaker without the
other, the operating loudspeaker is energized
from the associated transformer secondary half,
while the other half is open-circuited.
What I claim is:
j‘
'
-
1. The combination, in a radio receiver
equipped with a loudspeaker, of an audio output
ml
transformer, circuit connections from said-trans
former to the voice coil of said loudspeaker for
energizing the same, said circuit connections in
cluding a normally-closed switch, an adapter
provided with two pairs of sockets, both pairs be
ing electrically associated with the output trans
former, an auxiliary loudspeaker having a pair
of terminal plugs capable of selective coopera
tion with either pair of adapter sockets whereby.
said auxiliary loudspeaker may be energized from
the output transformer, and switch-opening
Now, if the second loudspeaker is connected means
cooperating with a socket of one pair of
between the contacts 5 and 6, both loudspeakers » sockets,
and with the normally-closed switch so
25 receive current and are simultaneously operative. that with
the auxiliary loudspeakeriplu'gged into
When inserting the plug of the second loud
the
last
mentioned
of sockets, the receiver 25
speaker into the sockets 3 and l, ‘the said plug loudspeaker will be pair
rendered inoperative,
moves the pin 1 situated within the socket 3,
2. The combination, in a radio receiver
whereby the switch i-2 will be opened, and equipped with a loudspeaker
located in the vi-,
30 consequently, the built-in loudspeaker of the re
cinity of thereceiveryof an audio output trans
ceiver will be disconnected and only the second, former, circuit connections from said transform
or auxiliary loudspeaker, will be operative.
er to the voice coil of said loudspeaker for ener
Figure 2 shows the structure of the connection gizing the same‘, said circuit connections inciud-g'"
device with the switch mounted thereon, and ing a normally-closed switch, an adapter pro-"3
35 Figure 2a shows diagrammatically the auxiliary vided
with two pairs of sockets, both pairs ‘be
' loudspeaker and its associated double plug il
ing electrically associated with the output trans 35
l2. The two pairs of sockets 3-4 and 5-8 of former, an auxiliary loudspeaker adapted to be
the connection device serve ‘for the selective in
located remotely from the receiver haying a pair
sertion of the double plu‘g ll-l2 of the second of
terminal plugs capable of selective coopera
. ' loudspeaker as explained above. The socket 3‘
has a lateral opening into which engages a nose tion. with either pair of adapter sockets whereby 40.
said remote auxiliary loudspeaker may be ener-'
1 of metal or insulating material maintained in
this position by means of a contact spring 0, and
plate 9 fastened to said spring. The contact
spring 8 is ?xedly secured to the support iii. The
actual contact I‘ is pressed against the contact
plate 2. by the spring I. .As soon as aplug- is
inserted into the socket 3, thenose 1- will be
gized from the output transformer, and‘switch
opening means cooperating with a socket of one
pair of sockets and with the normally-closed
switch so that with they auxiliary, loudspeaker
plugged into the last mentioned pair of sockets,
the receiver loudspeaker will be rendered inopera
tive, whereas with the auxiliary loudspeaker
moved laterally,- thereby moving the plate 9~ plugged
into the other pair of sockets, both loud
60 and spring 8 so that the switch contacts l-—2
speakers will be rendered operative simultane 50
4
'
ously.
,
It will therefore be seen'that I have provided
3.
A
circuit
arrangement ‘for utilizing an auxe
an arrangement for alternately operating either iliary loudspeakerin
conjunction .with a radio
the speaker forming a part .of the receiving set.
receiver
having
a
normally-equipped
55 or an auxiliary speaker at a distance from the -wl_iereby said loudspeakers may beloudspeaker
vselectively ;
will be opened.
arcaeoa
2
operated, either one without the other or both
simultaneously, comprising an adapter having
two pairs of sockets, an audio output transformer
having a center-tapped secondary, two of the
sockets, one of each pair, being electrically con
nected together and to one end of the trans
former secondary, the two remaining sockets
being electrically connected together and to the
center-tap of said secondary, circuit connec
tions between the center-tap of the secondary
10
and the other end of the secondary for energiz
er sockets, the arrangement being such that
without the auxiliary remotely-located loud
speaker being plugged into the adapter socket
only the normally-equipped loudspeaker will be
operative, whereas with the auxiliary remote
located loudspeaker plugged into that pair of
sockets having the switch-opening means co
operate with one of the sockets, only the auxil
iary loudspeaker will be operative, and with the
auxiliary loudspeaker plugged into the other pair 10
of sockets, both loudspeakers will be operative
ing the normally-equipped loudspeaker, said last
mentioned circuit connections including/a nor
mally-closed switch, and switch-opening means
15 ‘cooperating with one of the adapter sockets, the
arrangement being such that without the auxil
iary loudspeaker being plugged into the adapter
socket only the normally-equipped loudspeaker
will be operative, whereas with the auxiliary
20 loudspeaker plugged into that pair of sockets
having the switch-opening means cooperate with
one of the sockets, only the auxiliary loudspeaker
will be operative, and with the auxiliary loud
speaker plugged into the other pair of sockets,
25
'
both loudspeakers will be operative simultane
I’
ously.
4. A circuit arrangement for utilizing an aux
iliary remotely-located loudspeaker in conjunc
tion with a radio receiver having a normally
30
equipped loudspeaker whereby said loudspeakers
may be selectively operated, either one without
simultaneously.
5. In combination, an audio output transform
er having two secondaries, a loudspeaker ener
gized from one of said secondaries and having in
its connections thereto normally-closed switch
contacts, the other of said secondaries adapted
to energize a second loudspeaker, and means
whereby connection of said second loudspeaker
into operative relation with its associated sec
ondary causes the opening of the switch contacts
associated with the ?rst mentioned loudspeaker.
6. In combination, an audio output transform
er having two serially-connected secondaries, a
25
pair of sockets having electrical connection re
spectively to one end of one of said secondaries
and to the common ends of both secondaries, a
second pair of sockets, each having an electrical
connection to one of the sockets of the ?rst pair, 30
the uncommon end of the second secondary hav
ing a connection to the common ends of the sec
ondaries, said latter connection including the
voice coil of a loudspeaker and normally-closed
switch contacts, ‘and a second loudspeaker hav
output transformer having a center-tapped sec
ing associated with its voice coil a pair of plugs,
ondary,
two
of
the
sockets,
one
of
each
pair,
be
35
ing electrically connected together and to one, which when inserted into the ?rst pair of sockets
the other or both simultaneously, comprising an
adapter having two pairs of sockets, an audio .
' end of the transformer secondary, the two re
causes the energization of the latter loudspeaker
electrically connected to
gether and to the center-tap of said secondary,
circuit connections between the center-tap of the
secondary and the other end of the secondary
simultaneously with that of the ?rst loudspeaker
and when inserted into the second pair of sockets
causesthe energization of the latter loudspeaker
and the deenergization oi the ?rst loudspeaker
for energizing the normally-equipped loudspeak
by the opening of the normally-closed switch
contacts.
45
- maining sockets being
er, said last mentioned circuit connections in
cluding a normally-closed switch, and switch
45 opening means cooperating with one of the adapt
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