U.S. patent number 3,622,945 [Application Number 05/036,359] was granted by the patent office on 1971-11-23 for multipurpose rf wall tap.
This patent grant is currently assigned to Jerrold Electronics Corporation. Invention is credited to Joseph Oprysko, Donald H. Rogers, Eric Winston.
United States Patent |
3,622,945 |
Winston , et al. |
November 23, 1971 |
MULTIPURPOSE RF WALL TAP
Abstract
A multipurpose wall tap for use with CATV and MATV installations
or the like, having a mounting frame which fits into a standard
electrical outlet box. Affixed to the frame is a primary television
signal module, including the required circuitry to receive the
television signal from the lead-in cable, and a coaxial jack for
connection to a television set antenna lead. One or more of a
plurality of different auxiliary modules may be selectively
installed on the mounting frame and connected to the primary TV
module. Circuitry within these auxiliary modules converts the cable
signal for application to a variety of equipments and associated
leads, such as a coaxial TV antenna lead, a twin wire TV antenna
lead, or a single wire FM antenna lead. A cover plate protects the
jacks and terminals extending from the modules, and provides the
entire assembly with the appearance of a conventional electrical
outlet.
Inventors: |
Winston; Eric (Melrose Park,
PA), Rogers; Donald H. (Ivyland, PA), Oprysko; Joseph
(Philadelphia, PA) |
Assignee: |
Jerrold Electronics Corporation
(Hatboro, PA)
|
Family
ID: |
21888168 |
Appl.
No.: |
05/036,359 |
Filed: |
May 11, 1970 |
Current U.S.
Class: |
439/539 |
Current CPC
Class: |
H01R
24/525 (20130101); H01R 2107/00 (20130101) |
Current International
Class: |
H01R
13/00 (20060101); H01R 13/646 (20060101); H01r
013/60 () |
Field of
Search: |
;339/121,122,147,177,99 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Moore; Richard E.
Claims
We claim:
1. A multipurpose modular wall tap to facilitate connection between
a cable feeder line of a community antenna system or the like and
receiver antenna leads, said wall tap comprising a mounting bracket
shaped to fit within a common household electrical outlet box,
terminal means attached to said bracket to receive the end of said
feeder line, primary module means mounted upon said bracket
including a housing, primary and auxiliary outlet connectors
mounted on said housing, and first electrical circuit means within
said housing for coupling said terminal means to said outlet
connectors; and secondary module means mounted upon said bracket,
said secondary module means including a frame, a secondary outlet
connector and an auxiliary input connector mounted on said frame,
said secondary module being connected to said primary module by a
mating engagement of said auxiliary outlet and input connectors,
and second electrical circuit means in said frame for coupling said
secondary outlet connector to said input auxiliary connector, said
primary and secondary outlet connectors being located within their
respective modules so as to extend outwardly from the outlet box
through the vertical plane of the wall.
2. The wall tap of claim 1, further comprising insulating means
surrounding said primary and secondary outlet connectors mounted
upon said bracket, and having a raised potion periphery shaped in
the form of household electrical two-plug wall socket to provide a
configuration simulating the socket.
3. The wall tap of claim 1, in which said secondary outlet
connector is a coaxial connector.
4. The wall tap of claim 1, in which said secondary outlet
connector comprises twin screw-type contacts for transmitting TV or
FM signals.
5. The wall tap of claim 1, in which said secondary module outlet
connector comprises a single screw-type contact for transmitting AM
or FM radio signals.
6. The wall tap of claim 1, in which said secondary outlet
connector comprises a socket for supplying audio signals.
7. The wall tap of claim 1, in which said primary and secondary
auxiliary connectors are coaxial connectors, and said primary
outlet connector is also a coaxial connector.
8. The wall tap of claim 7, in which said mounting bracket
comprises a first section carrying said primary module means, a
second section displaced from and substantially parallel to said
first section and carrying said secondary module means, means for
coupling to the feeder line, and a third sloping section extending
between said first and second sections and carrying said feeder
line coupling means.
Description
This invention relates to apparatus for adapting a standard
household electrical wall outlet box to provide a convenient
terminus for receiving community antenna television (CATV) input
signals.
In many areas located remote from a commercial television
transmitter CATV systems have been provided to bring television
into the homes of residents in those areas who would otherwise not
be able to receive satisfactory reception of television signals.
Since the development of CATV there has long been a need for a
convenient and reliable unit for installation in the home for
connection to the CATV system lead-in conductor. Such a unit for
optimum utility is preferably easy to install, and should also be
adaptable for use with other types of input signal conductors such
as FM leads, and twin wire as opposed to coaxial TV leads.
It is an objective of this invention to provide a multipurpose RF
wall tap that will fit into a standard electrical outlet.
It is another objective of this invention to provide a housing and
a variety of signal adapting modules which fit therein, which
modules are adapted for connection to signal-carrying leads of a
variety of receiving equipment.
Another objective of this invention is to provide a multipurpose
tap housing that can be installed by an electrician.
The invention is comprised of a mounting frame or bracket, adapted
for installation within a standard electrical outlet box.
Cone-shaped bushings extend from the mounting frame, for coaxial
fit between the outer conductor and the dielectric of a
signal-carrying cable, to engage and ground the outer conductor of
the cable to the bracket. The bushing can be easily expanded to
accommodate the larger-sized cable.
Modular components attach to the mounting frame. Each such
component includes a tap or contact to which a particular type of
receiver antenna lead can be connected, along with the necessary
impedance-matching circuitry to couple the desired signal from the
feeder line to the tap. A primary TV module connects directly to
the center conductor of the feeder line and provides a primary TV
tap; and includes a socket connector to which auxiliary modules may
be connected. Auxiliary modules are provided with various kinds of
outlet taps, for example, to enable the selective use of coaxial or
twin lead TV antenna lead, FM antenna lead, or an audio jack.
In the design of the specific embodiment described herein, a
two-module assembly is provided wherein the primary module is
connected to the center conductor of the incoming coaxial cable and
includes both a socket connector to which the secondary or
auxiliary module is connected and a wall outlet tap preferably
designed to receive a coaxial cable. The secondary module provides
a second wall tap which can be designed with various configurations
to provide connection to various of antenna leads.
An insulating saddle is placed over the assembly to mask the
components thereof, exposing only the outlet contacts. Its outer
face is configured to receive the cover for a standard two-plug
electrical wall outlet.
The invention has the advantage of offering to the installing
contractor a single standard bracket which can be adapted for
connection to a variety of TV and radio antenna leads, and which
can be easily installed in an ordinary electrical outlet box
without being first connected to the feeder cable.
Another advantage of the invention is that the desired modules can
be installed at any time after the initial installation of the
mounting bracket. The modules can, of course, be changed at any
time thus making it a simple matter for a user to convert, for
example, from a 300-ohm twin-wire TV tap to a 75-ohm
quick-disconnect coaxial tap, or to install one of the other
auxiliary modules. All this can be accomplished without disturbing
the feeder lines.
The wall tap frame can be installed during the construction of the
building, thereby saving time and expense of later installation.
Installation errors may be quickly and easily corrected, and
customer options which may arise at a later date are easily
accommodated.
Other objectives, advantages, and various further features of
novelty and invention will be pointed out or will occur to those
skilled in the art from a reading of the following specification in
conjunction with the accompanying drawings.
Fig. 1 is a side view of an assembled RF wall tap of the invention,
including a primary module and an auxiliary module;
FIG. 2 is a front view of the wall tap of FIG. 1;
FIG. 3 is an interior view of the primary module of the wall tap of
FIG. 1;
FIG. 4 is a perspective view of the secondary module of the wall
tap of FIG. 1;
FIG. 5, 6 and 7 are views similar to FIG. 2, illustrating outlet
configurations for different secondary modules for use in the wall
tap of the invention;
FIGS. 8 and 9 are side and front views respectively of a cover
designed to surround the wall tap and simulate the configuration of
a standard two-plug outlet; and
FIG. 10 is a front view of the assembled multipurpose wall tap with
the outlet cover in place.
FIGURES 1 and 2 illustrate one embodiment of the RF wall tap
according to the invention as installed. The entire assembly
comprising the tap is mounted upon a bracket 10 which is of such
size that it may be mounted within a standard electrical outlet box
12, set in a wall 14. Conical bushings 16 and 18 (FIG. 2) extend
outwardly from bracket 10 and securely engage a coaxial feeder
cable 20.
The center conductor 22 of coaxial cable 20 is connected to an
insulated screw-type terminal 24 insulated from bracket 10 by means
of an insulator block 26. Bushing 16 penetrates coaxial cable 20
between its outer conductor, or sheath, and the dielectric to
thereby connect the sheath to ground at bracket 10.
A primary TV module generally designated 28 including a housing 30
is secured to bracket 10 such as by screws 32. The electrical
circuitry of the primary TV module 28 is not shown but is contained
within housing 30 and is connected to the center conductor 22 of
feeder cable 20 at terminal 24. A coaxial jack 34 extends outwardly
from the outer wall 35 of primary TV module 28 and beyond the plane
of wall 14 into which the tap is installed. Jack 34 provides a
convenient coaxial terminal for connection to a TV set or other
appropriate end use apparatus.
Extending downwardly from housing 30 is a coaxial fitting 36, to
which various different auxiliary modules may be selectively
connected as will hereinafter be described.
Mounting bracket 10 is preferably constructed from a single piece
of conductive material formed into a central section 38, an upper
section 40 and a lower section 42. Section 100 is in turn stepped,
to define two parallel platforms 44 and 46 connected by a sloping
section 48 which forms a slightly obtuse angle with said platforms.
The two conical bushings 16 and 18 are mounted on section 48. The
orientation of section 48 causes bushings 16 and 18 to angle
slightly away from section 38 to facilitate attachment of the
feeder cable thereto. Feet 50 and 52 extend respectively from end
sections 40 and 42 to provide means for securing bracket 10 to
outlet box 12.
An auxiliary module generally designated 54 is mounted on bracket
and electrically connected to the primary module 28. Module 54
comprises a mounting frame 56 upon which are mounted a coaxial
outlet tap 58 and a coaxial auxiliary tap 60 which receives the
coaxial fitting 36 of module 28. In this manner coaxial tap 58 is
connected to fitting 36 and thus to feeder cable 20. The tap of the
invention thus provides two different coaxial taps 34 and 58
available for use with external equipment. Frame 56 is secured to
bracket 10 such as by fasteners 61.
FIGURE 3 is an interior view of the primary TV module 28. Two feet
62 extend from the bottom of the housing and are engaged by screws
32 (see FIGURE 1) which thread into bracket 10. Two apertures 64
and 66 in the back of housing 30 provide access for the circuitry
therein to contacts 68 and 70 of terminal 24. Tubular plastic
insulating inserts 72 extend through apertures 64 and 66 to protect
the circuitry from grounding to housing 30. An RF shield 74 in the
form of a metallic shelf is disposed across the center section of
housing 30. Radio Frequency shield 74 functions in connection with
the circuitry contained within housing 30 which is not the subject
of this application, and will thus not be further discussed herein.
Coaxial jack 34 has its outer housing grounded to modular housing
30, with its central contact extending into the module housing for
connection to the circuitry therein.
The outer conductor of female section of fitting 36 is grounded to
the modular housing, and its inner center contact 36a extends into
module 28 for connection to the circuitry therein. Fitting 36 is
offset to one side of the center of modular housing 30 to avoid
interference with a connecting post 76 which functions to retain a
plastic cover over the wall tap as will be described below.
FIGURE 4 is a perspective of a typical auxiliary module such as 54
in FIG. 1. The auxiliary module has a substantially U-shaped frame
56 of conductive material, which includes a base 78. The frame 56
is secured to bracket 10 by screws 60 which pass through holes 84
in base 78; and by a tab 86 which extends from the end of platform
82 and fits into slot 88 in end piece 42 (see FIGURE 1).
The male section of jack 60 is attached to wall 80 in position to
engage female fitting 36 when frame 56 is mounted. The outer
housing of jack 60 is securely attached and grounded to wall 80.
The inner probe contact of jack 60 (not shown) extends through
frame 56 and is connected to the circuitry of the auxiliary module
disposed therein. The outlet connection, jack, or tap 58 of the
auxiliary module 54 is mounted upon platform 56, and is
electrically connected to module circuitry (not shown) mounted
within the module frame.
FIGURES 5, 6 and 7 are front views of three alternate
configurations of the tap of the invention illustrating different
auxiliary modules which may be installed in the above-described tap
at the option of the user. In each figure, the auxiliary module is
connected electrically to primary module 12 as previously
described.
In FIGURE 5 the auxiliary module 54a is configured to accept a
300-ohm twin-wire TV antenna lead. In this embodiment twin screw
contacts 90 for connection to a 300-ohm antenna wire are mounted
upon the outer face of the auxiliary module and appropriate
circuitry is mounted therein to deliver the TV signal received at
feed cable 20 to contacts 90.
In FIGURE 6 the auxiliary module 54b is configured to provide a tap
for an AM or FM radio antenna lead. In this instance a single screw
contact 92 is mounted upon the outer fact of the auxiliary module
for connection to a single-wire antenna lead.
In FIGURE 7 auxiliary module 54c is configured to accept a plug 94
associated with circuitry to supply audio signals exclusively to
the external equipment.
Connectors 90, 92 and 94 respectively illustrated in the typical
auxiliary module of 5, 6 and 7 are of types well known to the art
and therefore are not discussed in detail.
FIGS. 8 and 9 show a specially constructed plastic piece 96 which
is adopted to surround the primary and secondary outlet jacks or
taps and also provides a configuration similar to a standard
two-plug electrical wall outlet so that a standard outlet cover
plate may be used with the wall tap of the invention. The
insulating piece 96 is shown to have raised shoulder portions 98
and 100 with openings formed therein. The inner peripheries 102 and
104 of these openings respectively closely surround the primary and
secondary outlet taps which protrude through the openings in the
assembly. The outer peripheries 106 and 108 of the raised shoulder
portions are formed to coincide with the shape of the typical
two-plug wall socket so that the standard outlet box cover plate
fits snugly over the assembly. Insulating piece 96 is preferably
held in place by screws which pass into the connecting post 76,
mounted on a lug 110 projecting from bracket 10 (FIG. 1).
FIG. 10 shows the entire assembly with a cover plate 112 in
position over the insulating piece 98. FIG. 10 also illustrates the
view a user would have when looking at the assembled wall tap of
the invention. In the embodiment shown a coaxial outlet 34 and a
twin lead secondary outlet 90 as in FIG. 5 are provided for the
convenience of the user.
In practice, the bracket absent all modules may be installed in a
standard electrical outlet box within a building by nontechnical
personnel, and distribution cable installed during construction of
the building. At some later time, a technician can connect the
feeder cable to the wall tap and insert the desired combination of
modular adapters.
While the principles of the invention have been described in
connection with the above specific apparatus, it is to be clearly
understood that this description is made only by way of example and
not as a limitation to the scope of the invention.
* * * * *