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US005666408A
UIllted States Patent [19]
[11] Patent Number:
Lao
[45] Date of Patent:
[54]
5,666,408
Sep. 9, 1997
DUAL-LINE TELEPHONE JACK ADAPTER
4,651,340
3/1987 Marson ................................. .. 379/327
AND CABLE COUPLER
5,328,390
7/1994 Johnston ............................... .. 439/638
[76] Inventor: Kenneth Q. Lao, 650 Glen Ave.,
Primary Examiner-Dwayne B08!
west?eld, NJ. 07090
Assistant Examiner-Keith Ferguson
[57]
[21] Appl. No.: 555,843
[22] Filed_
Nov 13 1995
.
.
ABSTRACT
A 4-pin telephone jack adapter which alters the pin con?gu
ration of a 4-pin telephone jack such that the phone line
,
[51]
[52]
Int. Cl.6 .................................................... .. H04M 1/00
U.S. c1. ......................... .. 379/442 439/638' 439/676
Connected to the two Outer PinS 9f the jack is connected to
‘he tw° inner Pins Of the adapt“ and be accessible t° *1
[5 8]
Fi e]d of Se arch
’
379/142 438
379/327 397 332 437 45 1_ 439/638
one-line telephone set. The 4-pin telephone jack adapter can
have two receptacle one of which alters the pin con?guration
~ 628* 653’ 676’ 639’ 646 502’
’
[56]
’
’
’
’
References Cited
of a 4-pin telephone jack while the other has the same pin
con?guration. With such an adapter, two one-line telephone
sets can separately access to two phone lines connected to a
4-pin telephone jack. The same pin connection can be
U.S. PATENT DOCUMENTS
applied to a telephone cable coupler and a telephone exten
4,29s,702
10/1981 Snyder .................................. .. 379/442
4,362,905
12/1982 Ismail ....... ..
4,444,451
81°11 cable‘
379/442
4/1984 Myers ................................... .. 439/638
16 Claims, 11 Drawing Sheets
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DUAL-LINE TELEPHONE JACK ADAPTER
AND CABLE COUPLER
comprising two receptacles and one plug and 5) an extension
BACKGROUND OF THE INVENTION
phone plug on the adapters and couplers, according to the
cable comprising one plug on one end of the cable and one
or more receptacles on the other end. The receptacle or the
present invention, can have two exposed pins or four
The present invention is related to a phone jack coupler
exposed pins. These embodiments can be understood by
which electrically connects one or more telephone sets to a
reading the following description and the accompanying
phone jack providing the hookup for two diiferent telephone
drawing ?gures.
lines.
Most households have only one telephone line. The line is
?rst brought in by the phone company to a terminal box
outside the house and then brought into the house and wired
to a desired number of phone jacks distributed in various
rooms throughout the house. The phone jacks and the
interconnecting cables are very likely installed altogether
Conventionally, the two inner pins of a regular 4—pin
phone jack are used for carrying the telephone signals if only
one phone line (line 1) is hooked up. The side pins are used
for carrying the signals of another line (line 2) if two
different phone lines are hooked up. However, when a
when the house is built or renovated. The interconnection is 15
such that the pin con?guration in all the phone jacks is the
telephone set can be connected to line 2 when it is plugged
same, so that a telephone set can be hooked up to the phone
in the same 4-pin phone jack, without changing the wiring
line by plugging into any one of the phone jacks with a
telephone cable.
In general, a phone jack has four exposed pins seated in
in the phone jack.
'
Another embodiment of the present invention is a one
20
a row in its receiving end, to provide electrical contact to the
exposed pins on the phone cable plug. Currently, a regular
connecting two telephone sets. One receptacle switches the
lines from line 1 to line 2 and vice versa, while the other
receptacle does not alter the pin con?guration of the phone
25
adapters, except that a coupler comprises another receptacle
for receiving a telephone cable plug, in lieu of a phone plug
on an adapter. The telephone extension cable, according to
the present invention, is similar to the adapter, except that
the plug and the receptacle are electrically connected by a
and from a regular one-line phone set Electrically, the two
side pins are either opened or each of them is connected to
the adjacent inner pin. For use in one-line hookup, a phone
cable can have four wires or two wires.
As the use of modems and facsimile machines becomes
two or four-wire telephone cable instead of a shorter con
increasingly common in the ordinary household, many
houses are hooked up with two telephone lines. When a
35
two phone lines wired to a regular 4-pin telephone jack or
carded by a regular 4-pin telephone cable. The switching is
between line 1 and line 2.
Another objective of the present invention is to provide a
jack carry the signals for line 2 while the two inner pins carry
the signals the original line (line 1). By doing so, the two
telephone lines (line 1 and line 2) are accessible from any of
telephone adapting device for providing separate connection
the original installed phone jacks in the house without
to two phone lines wired to a regular 4-pin telephone jack or
rewiring the house’s interior. However, if one hook up a
carried by a regular 4-pin telephone cable.
regular telephone set to a phone jack, only line 1 can be
accessed. To use line 2, one could hook up a two-line
telephone set and choose the “line 2” setting on the set. 45
Alternatively, one could change the wiring behind the phone
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 illustrates the side view and the rear view of a
one-to-one telephone jack adapter.
jack, or switch the wires in a phone cable by cutting the
cable and reconnect the wires differently to allow signals
FIG. 2 illustrates the pin connection in the one-to-one
adapter of FIG. 1.
FIG. 3 illustrates the pin connection in a one-to-one
from line 2 to reach a regular one-line phone set. It should
be noted that, after a cable or a phone jack is altered, it can
no longer be used to hook up a regular phone set to line 1.
telephone cable coupler.
It is desirable to provide a dual-line phone jack coupler so
FIG. 4 illustrates the pin connection in a one-to-two
that a regular telephone set can be hooked up to line 2
telephone cable coupler.
without changing the interconnection behind a phone jack,
desirable to have a coupler that comprises two receiving
ends, or receptacles, each provides connection to a different
necting body on an adapter.
An objective of the present invention is to provide a
telephone adapting device for switching the connection of
company usually adds the new line (line 2) to the same
terminal box so that the two side or outer pins of the phone
or cutting up a cable to reconnect the Wire. Moreover, it is
jack. Thus, this one-to-two adapter can be used to connect
two regular telephone sets separately to line 1 and line 2.
The function of the couplers is similar to that of the
inner (center) pins of a phone jack and the corresponding
pins on the phone plug are used for transmitting signals to
household requests for an additional phone line, the phone
to-two adapter which comprises a plug for plugging into a
regular four-pin telephone jack and two receptacles for
one-line telephone set uses only two wires to receive and
transmit voice and ringing signals. Thus. only two of the
four pins on the phone jack are actually needed to connect
a regular phone set to a phone line. Conventionally, the two
regular (one-line) telephone set is plugged into a four-pin
phone jack. the set is connected to line 1. With the phone
jack adapter, according to the present invention, a regular
FIG. 5 illustrates the pin connection in a one-to-two
55
telephone line.
SUMMARY OF THE INVENTION
The present invention concerns with a phone jack adapter
which alters the pin connection in a 4-pin phone jack. The
invention has a number of embodiments: 1) a one-to-one
telephone jack adapter.
FIG. 6 illustrates the pin
telephone extension cable.
connection in a one-to-one
FIG. 7 illustrates the pin connection in a one-to-two
telephone extension cable.
FIG. 8 illustrates the pin connection in another embodi
ment of the one-to-one telephone jack adapter.
FIG. 9 illustrates the pin connection in another embodi
one phone receptacle and one phone plug; 3) a one-to-two 65
coupler comprising one receptacle on one end and two
ment of the one-to-one telephone cable coupler.
FIG. 10 illustrates the pin connection in another embodi
ment of the one-to-one telephone extension cable.
FIG. 11 illustrates the pin connection in another embodi
receptacles on the other ends; 4) a one-to-two adapter
ment of the one-to-two telephone jack adapter.
coupler comprising two phone receptacles for receiving two
telephone cable plugs; 2) a one-to-one adapter comprising
5,666,408
3
4
FIG. 12 illustrates the pin connection another embodi
ment of the one-to-two telephone cable coupler.
FIG. 13 illustrates the pin connection in another embodi
ment of the one-to-two telephone extension cable.
pins (rn.q) while inner pins (b,c) are electrically connected
to inner pins (o,p). The pin connection between receptacles
30 and 50 are the same as that illustrated in FIG. 3.
FIG. 5 illustrates the pin connection in the one-to-two
telephone jack adapter, according to the present invention.
which comprises a plug for plugging into a regular telephone
DETAILED DESCRIPTION OF THE
INVENTION
jack, and two receptacles for receiving regular telephone
cable plugs. As shown in FIG. 5 the coupler has one plug 2
FIG. 1(a) shows the side view of the one-to-one telephone
with four pins labeled by (a,b,c,d). The receptacles 40, 50in
jack adapter, according to the present invention. which alters
the pins con?guration in a four-pin telephone jack. As shown
FIG. 5 are identical to the receptacles 40 and 50 in FIG. 4.
The interconnection of pins are identical to that illustrated in
FIG. 4.
FIG. 6 illustrates the pin connection in the one-to-one
in FIG. 1(a), numeral 2 denotes a plug for plugging into a
regular telephone jack comprising four exposed pins there
within. On the plug body, a ?exible latch 3 is used to secure
telephone extension cable, according to the present
the plug to the telephone jack; numeral 4 denotes the four
exposed pins seated on one side of plug opposite to the latch
3 for providing electrical contact between the adapter and
the telephone jack. Numeral 20 denotes a receptacle which
has an opening 22 for receiving a regular telephone-cable
plug; numeral 24 denotes four exposed pins seated inside the
opening 22 for providing electrical contact between the
adapter and the telephone cable plug. The plug 2 and the
receptacle 20 is connected by a connecting body 10. The
invention, which is functionally similar to the one-to-one
adapter of FIG. 1 except that the connecting body 10 on the
one-to-one adapter is replaced by a telephone cable 11
comprising four wires. The pin connection is identical to that
15
in the one-to-one adapter as shown in FIG. 2.
FIG. 7 illustrates the pin connection in the one-to-two
20
connecting body 10 can be short or long, solid or ?exible.
The connecting body 10 comprises at least four wires (not
shown) for electrically connecting the pins 4 on the plug 2
and the pins 24 in the receptacle 24. The interconnection
between the pins is illustrated in FIG. 2. FIG. 1(b) illustrates
the rear view of the one-to-one telephone jack adapter
showing the opening 22 and the pins 24 of the receptacle 20.
25
invention, which is functionally similar to the one-to-two
adapter of FIG. 5 except that the connecting body 10 on the
one-to-one adapter is replaced by a telephone cable 11
comprising four wires. The pin connection is identical to that
in the one-to-two adapter as shown in FIG. 5.
FIG. 8 illustrates the pin connection in another embodi
ment of the one-to-one adapter wherein the plug and the
receptacle each has only two pins for carrying the signals of
one telephone line. As shown, the plug 7 comprises two pins
5. labeled by (a,d) which match the two outer pin positions
of a regular 4-pin telephone jack. The receptacle 21 com
prises two pins 25 in the opening 23. The pins 25, labeled by
(f,g), match the two inner pin positions of a regular tele
phone cable plug. Numeral 12 denotes a connecting body
comprising two wires for electrically connecting the pins 5
FIG. 2 illustrates the pin connection in the one-to-one
telephone jack adapter, according to the present invention. In
FIG. 2, the positions of the pins 4 are labeled (a,b,c.d),
matching the four pin positions of a regular 4-pin telephone
jack. The positions of pins 24 are labeled (e.f,g.h), matching
the four pin positions of a regular 4-pin telephone cable
plug. As shown. the two outer pins (ad) of the plug are
electrically connected to the two inner pins (f,g) of the
receptacle; the two inner pins (b,c) of the plug are electri
cally connected to the two outer pins (e,h) of the receptacle.
When the adapter is plugged into a phone jack which carries
telephone extension cable, according to the present
35
to the pins 25.
FIG. 9 illustrates the pin connection in another embodi
ment of the one-to-one coupler wherein each of receptacles
has only two pins for carrying the signals of one telephone
line 1 signals on its two inner pins and line 2 on its two outer
line. The interconnection of pins is identical to that of the
one-to-one adapter of FIG. 8. As shown, the pins 35 in the
pins. the inner pins (f,g) of the receptacle will carry line 2
signals while the outer pins (e,h) carry line 1 signals. Thus,
opening 33 of receptacle 31 are electrically connected to the
pins 25 in the receptacle 21.
when a regular one-line telephone set is plugged into a
FIG. 10 illustrates the pin connection in another embodi
phone jack through the adapter. the phone set is connected
ment of the one-to-one extension cable wherein only two
pins are used to carry signals of one telephone line. As
shown in FIG. 10, the extension cable is similar the one-to
to line 2.
FIG. 3 illustrates the pin connection in the one-to-one
telephone cable coupler, according to the present invention,
which comprises two receptacles for receiving regular tele
phone cable plugs. As shown, the four pins 34 in the opening
32 on the receptacle 30 are labeled (a,b,c,d) while the four
pins 24 in the opening 22 on the receptacle 20 are labeled
one adapter of FIG. 8 except that the connecting body 12 of
the adapter is replaced by a telephone cable 13 comprising
50
(e.f,g.h). The four pins on each receptacle match the four pin
positions of a regular 4-pin telephone cable plug. Similar to
the adapter illustrated in FIG. 2, outer pins (a,d) are con
nected to inner pins (f,g) while inner pins (c,d) are connected
to outer pins (e,h).
FIG. 4 illustrates the pin connection in the one-to-two
tacles has only two pins while the plug has four pins. As
shown in FIG. 11, the four pins 4 on plug 2 are labeled
55
which comprises three receptacles each-for receiving a
regular telephone cable plug. As shown, the four pins 34 in
two inner pin positions of a regular telephone cable plug.
FIG. 12 illustrates the pin connection in another embodi
the opening 32 on the receptacle 30 are labeled (a.b.c.d), the
four pins 44 in the opening 42 on the receptacle 40 are
labeled (m,o.p,q). and the four pins 54in the opening 52 on
receptacle 50 are labeled (e,f,g.h). The receptacles 40 and 50
ment of the one-to-two coupler wherein two of the recep
tacles each has only two pins while the third receptacle has
four pins. As shown in FIG. 12. the one-to-two coupler is
can be constructed on a solid body as shown in FIG. 4 or
such that outer pins (a,d) are electrically connected to outer
(a.b,c,d), matching the four pin positions of a regular tele
phone jack. The two pins 45 in the opening 43 of receptacle
41 are connected to the inner pins (b,c) while the two pins
55 in the opening 53 of receptacle 51 are connected to the
outer pins (a,d). The pins in receptacles 41 and 51 match the
telephone cable coupler, according the present invention,
they be connected by a connecting body. The pin connection
between receptacle 30 and receptacle 40 is straight-through
two wires. The pin connection is identical to that illustrated
in FIG. 8.
FIG. 11 illustrates the pin connection in another embodi
ment of the one-to-two adapter wherein each of the recep
similar to the one-to-two adapter of FIG. 11 except that the
65
plug 2 is replaced by a receptacle 30. The pin connection in
the one-to-two coupler of FIG. 12 is identical to that in the
one-to-two adapter of FIG. 11.
5,666,408
5
6
FIG. 13 illustrates the pin connection in another embodi
2 of said telephone jack to the respective lines of said
ment of the one-to-two extension cable wherein two of the
another telephone plug.
receptacles each has only two pins while the plug has four
8. The adapter of claim 7 further comprising a cable
comprising a plurality of wires to provide electrical connec
tions from said ?rst plug to said ?rst and second receptacles.
9. In a dual-line telephone system using connectors each
pins. The one-to-two extension cable of FIG. 13 is similar to
the one-to-two adapter of FIG. 11 except that the connecting
body 10 in the one-to-two adapter is replaced by a telephone
cable 11 comprising four wires.
The present invention is disclosed according to the
embodiments shown in FIG. 1 to FIG. 13. It is obvious to
those skilled in the art that many modi?cations, additions,
and deletions can be made therein without departing from
the spirit and scope of the invention as set forth in the
having 4 pin positions arranged in a row for seating elec
1O
cable plug; and
appended claims.
What is claimed is:
1. In a dual-line telephone system using connectors each
comprising 4 pin positions arranged in a row for seating
trical contacts wherein the two inner pin positions are used
for connecting line 1 while the two outer pin positions are
used for connecting line 2, a coupler comprising:
a ?rst receptacle having two ?rst pins positioned to match
the two outer pin positions of a ?rst 4-pin telephone
a second receptacle having two ?rst pins positioned to
match the two inner pin positions‘of a second 4-pin
15
telephone cable plug;
wherein the ?rst pins in said ?rst receptacle are separately
and electrically connected to the ?rst pins in said
electrical contacts wherein the two inner pin positions are
used for connecting line 1 while the two outer pin positions
are used for connecting line 2, an adapter comprising:
second receptacle so as to connect line 2 of said ?rst
cable plug to line 1 of said second cable plug.
a ?rst plug having two ?rst pins positioned to match the 20
10. The coupler of claim 9 further comprising a cable
two outer pin positions of a 4-pin telephone jack; and
having a plurality of wires to provide electrical connections
a ?rst receptacle having two ?rst pins positioned to
from said ?rst receptacle to said second receptacle.
match the two inner pin positions of a 4-pin telephone
11. The coupler of claim 9 wherein:
Plug;
said
?rst receptacle further comprises two second pins
wherein the ?rst pins in said ?rst plug are separately and 25
positioned to match the inner pin positions of said ?rst
electrically connected to the ?rst pins in said ?rst
4-pin telephone cable plug; and
receptacle so as to connect line 2 of said telephone jack
said second receptacle further comprises two second pins
to line 1 of said telephone plug.
positioned to match the two outer pin positions of said
2. The adapter of claim 1 further comprising a cable
second 4—pin telephone cable plug;
having a plurality of wires to provide electrical connections
wherein the second pins in said ?rst receptacle are sepa
from said ?rst plug to said ?rst receptacle.
rately and electrically connected to the second pins in
3. The adapter of claim 1 wherein:
said ?rst plug further comprises two second pins posi
tioned to match the two inner pin positions of said 4-pin
telephone jack;
35
said ?rst receptacle further comprises two second pins
positioned to match the two outer pin positions of said
4-pin telephone plug; and
said second receptacle so as to connect line 1 of said
?rst cable plug to line 2 of said second cable plug.
12. The coupler of claim 11 further comprising a cable
having a plurality of wires to provide electrical connections
from said ?rst receptacle to said second receptacle.
13. The coupler of claim 9 wherein said ?rst receptacle
further comprises two second pins positioned to match the
the second pins in said ?rst plug are separately and
electrically connected to the second pins in said ?rst
inner pin positions of said ?rst 4-pin telephone cable plug;
said coupler further comprising a third receptacle having
receptacle so as to connect line 1 of said telephone jack
two ?rst pins positioned to match the inner pin positions of
a third 4-pin telephone cable plug; wherein said second pins
in said ?rst receptacle are separately and electrically con
to line 2 of said telephone plug.
4. The adapter of claim 3 further comprising a cable
having a plurality of wires to provide electrical connections
?om said ?rst plug to said ?rst receptacle.
5. The adapter of claim 1 wherein said ?rst plug further
comprises two second pins positioned to match the inner pin
45
cable plug.
14. The coupler of claim 13 further comprising a cable
having a plurality of wires to provide electrical connections
from said ?rst receptacle to said second and third recep
positions of said 4-pin telephone jack; said adapter further
comprising a second receptacle having two ?rst pins posi
tioned to match the inner pin positions of another 4-pin
telephone jack; wherein the ?rst pins in said second recep
50
tacle are separately and electrically connected to the two
second pins in said ?rst'plug so as to connect line 1 of said
telephone jack to line 1 of said another telephone plug.
6. The adapter of claim 5 further comprising a cable
having a plurality of wires to provide electrical connections
from said ?rst plug to said ?rst receptacle and said second
receptacle.
nected to the ?rst pins in said third receptacle so as to
connect line 1 of said ?rst cable plug to line 1 of said third
55
tacles.
15. The coupler of claim 9 wherein said ?rst receptacle
further comprises two second pins positioned to match the
inner pin positions of said ?rst 4-pin telephone cable plug;
said coupler further comprising a third receptacle having
four pins positioned to match the corresponding pin posi
tions of a third 4-pin telephone cable plug; wherein the ?rst
and second pins in said ?rst receptacle are separately and
electrically connected to the corresponding pins of said third
7. The adapter of claim 1 wherein said ?rst plug further
having two second pins positioned to match the inner pins of
said 4-pin telephone jack; said adapter further comprising a
second receptacle having four pins positioned to match the
receptacle so as to connect line 1 and line 2 of said ?rst cable
corresponding pin positions of another 4-pin telephone plug;
from said ?rst receptacle to said second and third recep
tacles.
wherein the ?rst and second pins in said ?rst plug are
separately and electrically connected to the corresponding
pins in said second receptacle so as to connect line 1 and line
plug to the respective lines of said third cable plug.
16. The coupler of claim 15 further comprising a cable
having a plurality of wires to provide electrical connections
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