U.S. patent number 3,845,454 [Application Number 05/299,453] was granted by the patent office on 1974-10-29 for tamper-resistant cable terminator.
This patent grant is currently assigned to Gilbert Engineering Company Inc.. Invention is credited to James E. Chapman, Robert D. Hayward, Stanley R. Ray.
United States Patent |
3,845,454 |
Hayward , et al. |
October 29, 1974 |
TAMPER-RESISTANT CABLE TERMINATOR
Abstract
A tamper-resistant cable terminator assembly especially adapted
for use in a CATV cable transmission system. The assembly consists
of an outer barrel member which encloses a female connector having
an integral terminal resistor. A snap ring retains the female
connector inside the barrel member. The female connector is engaged
with the male threads on a fixed cable terminal by means of a
special tool inserted through an aperture in the barrel member.
When the female connector is rotationally engaged with the male
threads on the fixed cable terminal, the barrel member is free to
rotate around the male-female connector assembly and the terminator
assembly cannot be removed from the terminal without using the
special locking tool.
Inventors: |
Hayward; Robert D. (Phoenix,
AZ), Chapman; James E. (Glendale, AZ), Ray; Stanley
R. (Phoenix, AZ) |
Assignee: |
Gilbert Engineering Company
Inc. (N/A)
|
Family
ID: |
23154853 |
Appl.
No.: |
05/299,453 |
Filed: |
October 20, 1972 |
Current U.S.
Class: |
439/307; 333/22R;
70/404; D13/133 |
Current CPC
Class: |
H01R
13/6397 (20130101); H01R 13/621 (20130101); H01R
24/40 (20130101); Y10T 70/7853 (20150401); H01R
2103/00 (20130101) |
Current International
Class: |
H01R
13/00 (20060101); H01R 13/621 (20060101); H01R
13/646 (20060101); H01R 13/639 (20060101); H01r
013/54 () |
Field of
Search: |
;339/36,39,85,147
;333/22R ;70/404 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: McGlynn; Joseph H.
Attorney, Agent or Firm: Drummond; William H.
Claims
Having described the invention in such full, clear and concise
terms as to enable those skilled in the art to understand and
practice it, and having identified the presently preferred
embodiment of the invention, we claim:
1. In a tamper-resistant cable terminator assembly specially
adapted for use in a CATV cable transmission system, said system
including
a cable for transmitting electrical signals, and
a fixed cable terminal comprising a first connector member of a
rotationally engageable male-female connector member pair,
said cable terminator assembly including
a second connector member of said pair having means for engaging a
locking tool adapted to rotate said pair into locking
engagement,
an outer shield member coaxially rotatable about said connector
pair member, shaped and dimensioned to receive and enclose said
connector pair therewithin when lockingly engaged, and
means for retaining said second connector member inside said outer
shield member,
the improvement whereby the tamper-resistance of said terminator
assembly is increased, said improvement comprising:
a. means carried by said second connector member forming a
cylindrical extension thereof and having at least one
locking-tool-engaging recess formed in the inner wall thereof and
extending radially outwardly; and
b. means defining a locking tool access port in said outer shield
member communicating with the interior of the cylindrical extension
of said second connector member, the diameter of said port being no
larger than the inside diameter of said cylindrical extension.
Description
This invention relates to a cable terminator assembly.
More particularly, the invention relates to a cable terminator
assembly especially adapted for use in a CATV cable transmission
system.
In a further and more specific respect, the invention concerns a
cable terminator assembly which can be readily installed and
removed from a CATV cable terminal to prevent unauthorized use of
the CATV facilities. Installation and removal of the terminator
assembly must be accomplished by means of a special locking tool
not readily available to the general public.
In still another, further and more specific respect, the invention
concerns a special locking tool for use with a CATV cable
terminator assembly.
In a cable antenna television (CATV) system, a central antenna is
situated in a remote location selected for proper reception of
line-of-sight television signals. The signals are then transmitted
to television receivers located in a plurality of residences,
business establishments, etc., by means of a permanently installed
coaxial cable. A fee is charged for the right to connect a
television set to the coaxial cable.
The connection to the coaxial cable is usually made at one of two
general locations, i.e., at a multiple-terminal junction box
located at a central point in a residential or commercial
neighborhood to provide service for a plurality of subscribers or
at single terminal junction boxes located on the walls in various
rooms of apartment buildings or the like.
Because the multiple or single terminal junction boxes are usually
readily accessible to the general public, it is possible for a
moderately skilled person to connect his television receiver to the
coaxial cable, using conventional, readily available hand-tools,
without paying the required subscription fee. It would be highly
desirable to effectively prevent such unauthorized use of CATV
facilities by unauthorized persons, with consequent loss of
subscription revenues.
Accordingly, it is an object of the present invention to provide a
tamper-resistant cable terminator assembly.
Another object of the invention is to provide a tamper-resistant
terminator assembly for use in a CATV cable transmission
system.
Still another object of the invention is to provide a
tamper-resistant cable terminator which can only be installed and
removed from a CATV cable terminal by means of a special locking
tool which is not generally available to the public.
Still another and further object of the invention is to provide a
locking tool especially adapted for use with a shielded cable
terminator assembly, which tool is capable of rotating connector
members within the tamper shield into locking engagement with
sufficient torque to prevent disengagement of the connector members
with conventional tools.
These and other, further and more specific objects of the invention
will be apparent to those skilled in the art from the following
detailed description thereof taken in conjunction with the
drawings, in which:
FIG. 1 is a partially cut-away perspective view of a cable
terminator assembly constituting the preferred embodiment of the
invention;
FIG. 2 is a perspective view showing the conventional manner of
connecting the antenna cable of a television receiver to a CATV
cable terminal on a multiple-terminal junction box, showing a
conventional cable terminator assembly and showing the cable
terminator of FIG. 1 installed in operative position;
FIG. 3 illustrates the method of installation of the cable
terminator assembly of FIG. 1 on a single terminal CATV cable
junction box such as might be located on the interior wall of an
apartment dwelling;
FIG. 4 is a partially cut-away exploded perspective view of the
cable terminator assembly of FIG. 1;
FIG. 5 is a perspective view of the special internal female
connector member of the assembly of FIGS. 1-4;
FIG. 6 is a cut-away, partially exploded perspective view of a
novel locking tool especially adapted for use with the cable
terminator assembly of FIGS. 1-4; and
FIGS. 7 and 8 are sectional views illustrating the mode of
operation and use of the tool of FIG. 6 and the terminator assembly
of FIGS. 1-4.
Briefly, in accordance with the invention, we provide a
tamper-resistant cable terminator assembly especially adapted for
use in a CATV cable transmission system, which system includes a
cable for transmitting electrical signals and a fixed cable
terminal comprising a first connector member of a rotationally
engageable male-female connector member pair. The terminator
assembly comprises the second connector member of said pair which
is provided with means for engaging an elongate locking tool to
rotate said connector pair into locking engagement. The second
connector member is received and enclosed within an outer shield
member, the shield member being provided with a recess shaped and
sized to permit the shield member to freely rotate coaxially about
the connector pair. The assembly also includes means inaccessible
from outside the shield when the connector pair is lockingly
engaged for retaining the second connector member inside the
recess. Finally, the terminator assembly also includes means
defining a locking tool access port in the shield member, the port
being fixed and shaped to temporarily receive the elongate barrel
of said tool therethrough to rotate the second connector member and
lock and unlock the second connector member from the first
connector member.
The locking tool comprises a hollow handle portion having an
elongate hollow barrel portion extending from the handle portion,
the barrel portion having at least one aperture formed in the wall
thereof adjacent the terminal end thereof. The tool also includes
an operating shaft member slidably received in the hollow barrel
portion and means for limiting the movement of the operating shaft
within the barrel between a retracted position and an extended
position. Finally, the tool includes connector member engaging
means which are operatively linked to the shaft within the barrel
member. The engaging means are adapted to extend outwardly through
the barrel member aperture and engage the connector member for
rotation thereof when the operating shaft is in the extended
position and is further adapted to retract inwardly of the barrel
member out of engagement with the connector member when the
operating shaft is in the retracted position.
Turning now to the drawings, which illustrate the presently
preferred embodiment of the invention but which are not to be
construed as limiting the scope of the invention to the embodiment
shown and described therein, FIG. 1 illustrates the assembled
terminator assembly consisting of a female connector member 11
received within the recess 12 of the shield member 13. The lower
skirt 14 of the connector member 11 is provided with internal
threads 15. The upper portion of the female connector member 11 is
hollow and is provided with slots 16 which engage a locking tool
which can be inserted through the bore 17. The connector member 11
is retained within the shield 13 by a retainer ring 18 received in
a groove in the lower end of the shield 13. The upper portion of
the shield may be provided with a male threaded portion 19, the
purpose of which will become apparent from the following
description.
FIG. 2 illustrates a typical multi-terminal junction box in a CATV
cable transmission system. Signals from the central CATV antenna
are transmitted via a coaxial cable 21 to various junction boxes
located throughout the area served by the CATV system. The junction
box 22, as shown in FIG. 2, is provided with a plurality of
terminals 23 for connecting individual subscribers' television
receivers to the main cable 21. The terminal 23 is neither
connected to a subscriber's line nor terminated. The terminal 23a
is shown connected to a typical subscriber's line 24. The terminal
23b is shown connected to a typical prior art cable terminator 25.
The terminal 23c carries the cable terminator assembly 26 of FIG.
1. The threaded portion 19 of the device of FIG. 1 provides a
convenient place to attach the subscriber's cable 24a when the
terminal 23c is out of service.
As shown in FIG. 3, the terminator assembly 26 of FIG. 1 is
similarly useful in terminating a single CATV cable terminal 23
mounted on the wall of the interior of a house, apartment or place
of business.
FIGS. 4 and 5 illustrate in greater detail the assembly of FIG. 1.
The shield member 13 is provided with a recess 41 which receives
and encloses the female connector member 11, the lower portion of
which is provided with internal female threads 15. The upper
portion 42 of the connector 11 is hollow and is received in the
reduced-diameter portion 42 of the shield member 13. The upper end
of the connector 11 is provided with slots 43 which engage with a
special locking tool, as will be described below. A resistor 44 is
connected to a conductor 45. When the cable is terminated, the
conductor 45 is received in the central socket 46 (FIGS. 2-3) of a
male terminal to provide the necessary terminal impedance. The
resistor 44 is secured within a reduced-diameter portion 47 of the
female connector 11. The connector member 11 is retained within the
recess 41 of the shield 13 by a retaining ring 48 seated in a
groove 49 in the lower end of the shield member 13.
FIG. 6 illustrates the assembly of the special locking tool. A
hollow handle member 61 receives the upper portion 62 of a hollow
barrel 63. An operating shaft 64 is slidably received within the
barrel 63. The movement of the shaft 64 within the barrel 63 is
limited by a pin 65 in a slot 66 formed in the operating shaft 64.
The pin 65 also locates a retractor sleeve 67 slidably received on
the barrel 63. Movement of the retractor sleeve 67 in the direction
of the arrow A causes the operating shaft 64 to slide rearwardly
within the barrel 63 against the action of the spring 68. A
generally V-shaped spring member 69 having laterally extending lugs
70 formed in the ends of each leg is linked to the operating shaft
64 by means of a pin 71 extending through a loop formed at the apex
of the V-shaped spring member 69. In the preferred embodiment shown
in the drawings, the legs of the spring member 69 are normally
urged together. As the shaft 64 moves in the direction of the arrow
B, the legs are spread apart by a pin 72, forcing the lugs 70
outwardly through apertures 73 formed adjacent the lower end of the
barrel 63.
The mode of operation of the tool and terminator assembly is
illustrated in FIGS. 7-8. FIG. 7 shows the tool with the shaft 64
partially inserted into a bore 81 formed in the upper end of the
shield member 13. Finger pressure in the direction of the arrow A
moves the retractor sleeve 67 toward the handle 61. The retractor
sleeve 67 is mechanically linked by means of the pin 65 to the
operating shaft 64, which also moves in the direction of the arrow
A against the action of the spring 68. The movement of the shaft in
the direction of the arrow A allows the spring member 69 to move
out of contact with the spreading pin 72 such that the lugs 70
retract within the barrel 63. The barrel 63 can now be inserted
further into the bore 81, as shown in FIG. 8, until the apertures
73 register with the slots 43 formed in the upper end of the female
connector member 11. At this point, the lugs 70 can move outwardly
and the shaft 64 is urged away from the handle portion 61 by the
spring 68. The lugs of the V-shaped spring 69 are spread apart by
the pin 72, forcing the lugs 70 outwardly into engagement in the
slots 43 of the female connector member 11. In the position shown
in FIG. 8, rotation of the handle 61 causes the female connector
member 11 to rotate such that it can be threaded with the male
threads of a CATV terminal 23 (FIGS. 2-3). When the connector
members 11 and 23 have been rotationally engaged, the retractor
slide 67 is moved toward the handle, causing the lugs 70 to retract
within the barrel 63 and permitting the tool to be withdrawn from
the bore 81.
* * * * *