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Патент USA US2413030

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Dec. 24, 1946.
E. s. MCLARN
2,413,930
CORD CONNECTOR FOR TELEPHONE INSTRUMENTS
Filed Dec. 11, 1942
3 Sheets-Sheet l
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15'R/VEST 6.7% lag/v
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Dec. 24, 1946,
E. ‘s. MCLARN '
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2,413,030
Sheets-Sheet 2
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Dec. 24, 1946.
2,413,030
E. s. MCLARN
CORD CONNECTOR FOR TELEPHONE IN$TRUMENTS>
Filed Dec. 11. 1942
3 Sheets-Sheet 3
$01
mi
N,
BY
2,413,030
Patented Dec. 24,1946
UNITED STATES' PATENT OFFICE
2,413,030
CORD CONNECTOR FOB TELEPHONE
INSTRUMENTS
Ernest S. McLarn, Manhas'set, N. Y., assignor to
International Standard Electric Corporation,
New York, N. Y., a corporation of Delaware
Application December 11, 1942, Serial No. 468,605
8 Claims. (01. 179—101)
2
1
This invention relates to telephone handsets
and more particularly to means for connecting
a multi-conductor cord to the transmitter and
ceiver capsules 4 and 5 respectively. A channel
is molded along the length of the handset to
receive a multiconductor cord with spaced con
ductors in ?at arrangement, more speci?cally
?at three conductor cord 3 which lies at the
bottom of each cavity I, 2 and passes through
inexpensive, simple and ef?cient means for con
the handle. The rubber or plastic cover of the
necting the so-called tip-less cordage to tele
cord 3 is formed with a longitudinal ridge which
phone handsets not especially designed for use
?ts into a corresponding groove in the channel
with such cordage.
In my copending application Serial No. 438,774 10 and thus ensures that the cord is correctly po
receiver units of such handsets.
An object of the invention is to provide an
?led April 13, 1942, patented Oct. 3, 1944, No.
2,359,570, there is disclosed a telephone handset
provided with a so-called tip-less cord which is
threaded in a channel formed in the handset
sitioned therein. The cavity I adapted to receive
the transmitter capsule 4 has molded in its bot
tom two cylindrical depressions 6, 1 into which
?t corresponding depending projections 8, 9 in
shell and extending down the handle from the 15 the lower surfaces of the adapter.
The adapter comprises a molded insert as il
transmitter cavity to the receiver cavity. The
lustrated in Figs. 2 to 4 and consists of an an
transmitter and receiver capsules are provided
nular base It) formed with the depending pro
with connectors formed with sharp prongs which
jections or pegs 8, 9 and diametrically disposed
pierce the cord and make electrical connection
with the proper stranded conductors when the 20 holes ll, [2. The upper surface is provided with
transmitter and receiver caps are screwed down.
It will be appreciated that this construction
necessitates the use of specially constructed
transmitter and receiver capsules or elements.
It is therefore, another object of the present in
vention to provide adapter devices which will
a pair of arcuate projections l3, M the func
tion of which will be explained later. They cen
ter of the base In is formed with a rectilinear 7
hole l5 provided at each corner with narrow
slots l6 for accommodating the side edges of the
contact members ll, l8. On each side of the
hole l5 the bottom of the base I!) is formed with
permit the use of standard transmitter and re
a line of molded teeth l9 which register with
ceiver capsules not equipped with the pronged
the cord 3 when the adapter is inserted in the
connectors in a handset of the kind employing
a continuous tip-less cord extending between the 30 transmitter cavity I.
transmitter and receiver cavities.
.
The contact members I7, I13 consist of hard,
metal strips the ends of which are bent over at.
These and other objects and features of the
a right-angle the depending edges being providinvention will be clear from a reading of the
ed with a plurality of sharp prongs 20. The cone
following description in conjunction with the
accompanying drawings in which:
_
’ tact members l1, 18 are fastened to the base H]?
by metal eyelets 2|, 22 which are inserted in the:
Fig. 1 is a plan view of a handset with the
holes ll, I2 and their lower ends spun over
transmitter and receiver caps removed and the
against the lower surface of the base member
handle broken away,
ID. The eyelets 2i, 22 also secure to the base
Fig. 2 is a partial section of the transmitter
end on the line 2-2 of Fig. 1,
40 member 10. a pair of U-shaped springs 23, 23
the free arms of which extend upwards into
Fig. 3 is a partial section of the transmitter
the cavity I.
end taken on the line 3-3 of Fig. 1 but also
To assemble the transmitter end, the adapter
is positioned in the base of the cavity l with the
45 projections 8, 9 ?tted into the holes 6 and T.
insert,
' Fig. 5 is a partial section of the receiver end
The transmitter capsule 4 is then inserted in
on the line 5—5 of Fig. 1,
'
'
the cavity l and the cap 25 screwed on to the
Fig. 6 is a partial section of the receiver end
end of the handset shell. An annular projection
taken on the line 6-6 of Fig. 1 but also showing
26 on the inside of the cap 25 engages the cap
the cap and the receiver capsule,
50 sule 4 and the act of screwing on the cap 25
Fig. '7 is a plan view of the molded receiver
forces the lower part of the capsule 4 against
insert.
the top of the arcuate projections l3, I4 on the
Referring ?rst to Figs. 1 to 4, the handset com
adapter base I 0 and at the same time causes
prises a molded shell having cavities I, 2 at each
contact to be made between the spring 23 and
end for accommodating the transmitter and re 55 the capsule case and between the other spring
showing the cap and the transmitter capsule,
Fig. 4 is a plan View of the molded transmitter
2,413,030
3
24 and the center terminal 36. The adapter
base I0 is pressed ?rmly towards its seating in
the base of the cavity I and the sharp prongs
4
said transducer element is seated in said cavity
and for holding the yielding contacts against the
electrode terminals.
2. A telephone transducer comprising a sup
20 of the contact members l1, l8 are caused to
pierce the insulation of the cord 3 and are driven Cl porting shell, a transducer element, a cavity in
said shell for accommodating said transducer
into the stranded wires of the two outer con
ductors. At the same time the teeth l9 are
clamped against the upper surface of the cord
3 on either side of the prongs 20 thus securing
the cords against movement.
> element, a conductor cord comprising a plurality
of parallel conductors, a channel in the bottom
of said cavity for said conductor cord, a detach
10 able connector block having mounted thereon a
Referring now to Figs. 5 to '7 the construction
of the receiver end is generally similar to that
pair of connector members formed with depend
ing sharp prongs and also having mounted there
of the transmitter end. The adapter shown in
Figs. 5 to '7 comprises a molded block I0’ formed
with depending pegs 8', 9' adapted to ?t into
holes 6’, ‘l’ in the base of the cavity 2, and up
on a pair of upwardly-extending spring contacts,
electrical connections between said connector
members and said spring contacts, a surface on
said connector block which abuts a portion of the
casing of said transducer element when the latter
is inserted in said cavity said connector members
engaged by the receiver capsule 5 when the cap
and said spring contacts being so shaped and
25' is screwed home. The central hole I5’ is
slightly off-set from center so that the prongs 20' 20 positioned that when said transducer element is
forced home in said cavity said prongs are forced
of the contact members l1’, l8’ are off-set and
into said cord to make electrical contact with
will pierce the centre conductor and one of the
conductors thereof and said spring contacts make
outer conductors of the cord 3. A pair of U
contact with the electrode terminals of said
shaped contact springs 23’, 24' and the contact
members ll’, [8' are fastened to the block III’ by 25 transducer element.
3. A telephone transducer according to claim 2
screws 29, 30 which are screwed into the holes.
in which said connector block is provided with a
ll’, I2’.
plurality of projecting portions and the bottom
In assembling the receiver end, the block [0’ is
of said cavity is formed with corresponding de
positioned in the receiver end cavity 2 with the
pressions to receive said projecting portions.
pegs 8’, 9’ which are of di?erent diameters enter
4. A telephone transducer according to claim 2
ing the holes 6’, ‘I’ also of different diameters to
in which a common fastening means is provided
correspond with the peg characters, the receiver
for securing each connector memberand its cor
capsule 5 is then inserted and the cap 25' screwed.
responding spring contact to said connector block.
on, during which operation the capsule 5 engages
5. A telephone transducer according to claim 2
the cheeks l3’, [4' on the block I0’ and forces
in which the lower surface of said connector block
the prongs 20’ into the stranded wires of the
is, provided on either side of said prongs with
centre and one outer conductor of the cord 3:
wardly projecting cheeks I3’, I 4' adapted to be
at the same time electrical contact is made be
teeth which are clamped down upon said cord
when said transducer elements is forced home in
tween the terminals 21, 28 on the receiver capsule
and the springs 24' and 23' respectively.
40 said cavity.
6. A telephone transducer comprising a sup
It will be understood of course that the two
porting shell, a transducer element, a cavity in
pronged contact members at the receiver end
said shell for accommodating said transducer
might be arranged to effect contact with the two
element, a conductor cord comprising a plurality
outer conductors respectively and thetwo pronged
contact members at the transmitter end to make 45 of parallel conductors, means for positioning said
cord at the bottom of said cavity, a detachable
contact with the centre and an outer conductor
connector block having mounted thereon con
depending upon the manner in which the con
nector members formed with sharp prongs and
ductors of the cord 3 are connected to the sub
also having mounted thereon yielding contacts
station circuit. In this arrangement, the pegs
shaped so as to‘make contact with the electrode
8', 9' of the receiver capsule adapter and their
terminals of said transducer element when the
corresponding holes 6’, 1' need not be dissimilar
latter is inserted into said cavity, electrical con
in diameters as poling would not be necessary,
nections between said connector members and
whereas the pegs 8, 9, of the transmitter capsule
said yielding contacts, an abutting surface on
adapter and their corresponding holes 6, 1' would
said connector block which abuts a portion of the
be of different diameters to ensure of the pronged
casing of said transducer element when the latter
contact members piercing the proper conductors.
is inserted into said cavity, a peripheral lip on
What I claim is:
said transducer element, a seating for said lip on
1. A telephone transducer comprising a sup
said supporting shell at the edge of said cavity,
porting shell, a transducer element, a cavity in
and
a threaded cap formed with an abutment
60
said shell for accommodating said transducer
which when said cap is screwed onto said shell
element, a cover for the cavity, a conductor cord
forces said lip against said seating, the distance
comprising a plurality of parallel conductors,
from the points of said prongs to said abutting
means for positioning said cord at the bottom of
surface on said connector block ‘being such that
said cavity, a detachable connector block having
when said lip is forced against its seating by the
mounted thereon connector members formed with
act of screwing on said cap, the said prongs are
sharp prongs and also having mounted thereon
forced into said cord and make electrical contact
yielding contacts shapedpso‘as to make contact
with conductors-of said cord.
with the electrode terminals of the transducer
'7. A- telephone transducer comprising a sup
element when the latter is inserted in said cavity,
porting shell, a transducer element,v a cavity in
electrical connections between said connector
said shell. for accommodating said transducer
mmebers and said yielding contacts, and means
element, a conductor cord comprising a plurality
including the cover for forcing the said prongs
of parallel conductors, means for positioning said
of said connector members into saidcord to auto
matigally make electrical contact between said
cord at the bottom of said cavity, a detachable
electrode terminals, and said, conductors; when. 75.. connector. block. having mounted thereon con
2,413,036
5
tacle having at its bottom a multiconductor cord
with spaced apart conductors and inwardly
extending guides at opposite sides of said cord,
nector members formed with sharp prongs and
also having mounted thereon yielding contacts
shaped so as to make contact with the electrode
terminals of said transducer element when the
latter is inserted into said cavity, electrical con
nections between said connector members and
said yielding contacts, an abutting surface on
said connector block which abuts a portion of the
casing of said transducer element when the latter
is inserted into said cavity, and a threaded cap
a seat for a transducer element and a cap to
close the receptacle and force said transducer
element against said seat, said unit having cord
piercing members spaced in accordance with said
conductors, means to cooperate with said guides
to position said cord piercing members over said
‘conductors, yieldable contacts connected to said
cord-piercing members and positioned to coop
formed with an abutment which when said cap
erate with the electrodes of said transducer ele
is screwed onto said shell forces said transducer
ment, and upward projections for engagement
element and said connector block downwardly in
with said transducer element whereby movement
said cavity, the distance from the points of said
prongs to said abutting surface on said connector 15 of the transducer element against its seat will
force the connector unit inwardly and the cord
block being such that when said cap is in its
piercing members into engagement with said
screwed on position the said prongs are forced
conductors.
into said cord and make electrical contact with
ERNEST S. McLARN.
conductors of said cord.
,
3- A connector unit for insertion into a recep
20
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