U.S. patent number 3,568,128 [Application Number 04/782,395] was granted by the patent office on 1971-03-02 for ground clamp.
Invention is credited to George W. Taylor.
United States Patent |
3,568,128 |
Taylor |
March 2, 1971 |
GROUND CLAMP
Abstract
A ground clamp for making a ground connection to the sheath of a
coaxial cable. The ground clamp is provided with relatively wide
metal clamping members having arcuate portions for clamping the
metal sheath therebetween after the outer insulation is stripped
from the cable and the sheath is exposed. These portions of the
ground clamp cable are enclosed in a plastic housing which is made
of two identical sections that are adapted to be held together by
the anchoring screw. The housing sections are provided with
inwardly extending ridges that engage the outer plastic coating of
the cable to form seals therewith and prevent moisture from
entering the housing.
Inventors: |
Taylor; George W. (Cupertino,
CA) |
Family
ID: |
25125916 |
Appl.
No.: |
04/782,395 |
Filed: |
December 9, 1968 |
Current U.S.
Class: |
439/98; 439/460;
439/801; 24/335; 403/389; 439/527 |
Current CPC
Class: |
H01R
9/0512 (20130101); H02G 3/0683 (20130101); H01R
4/64 (20130101); H02G 1/1229 (20130101); Y10T
403/7129 (20150115); Y10T 24/3439 (20150115) |
Current International
Class: |
H02G
1/12 (20060101); H02G 3/06 (20060101); H02G
3/02 (20060101); H01R 9/05 (20060101); H01R
4/64 (20060101); H01r 009/10 () |
Field of
Search: |
;339/14,107,119,125,149,177,208,263,265 ;333/8,96 ;174/71,71 (C)/
;174/78 ;24/81 (BA)/ |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Other References
Dossert & Co. Catalog -5, Page 36, 12/30/38 174--71.
|
Primary Examiner: Champion; Marvin A.
Assistant Examiner: Clifford; Patrick A.
Claims
I claim:
1. In a ground clamp for making a ground connection to the metal
sheath of a coaxial cable which is provided with an outer
insulation covering, the combination comprising a two piece housing
of electrically insulating material, said two pieces being adapted
to be interchangeably assembled so that one piece forms a top and
the other forms a bottom of said housing, said housing having a
cavity extending across the length thereof, said cavity having a
generally circular cross section and the opposite end portions of
said cavity snugly engaging the insulation covering of said coaxial
cable, said two piece housing having a narrow opening on one side
thereof leading into the side of said cavity, a ground connection
for said sheath comprising at least one metal strip member having
an arcuate end portion engaging a portion of said sheath that has
been exposed, said strip member extending out of said cavity in
said housing through said narrow side opening, said housing having
a hole formed therethrough from the top to the bottom thereof, a
fastening member positioned in said hole for holding said two piece
housing assembled so that the outer covering of said insulation is
clamped in said cavity and means provided to the portion of said
strip member extending out of said narrow opening for making
electrical connection thereto.
Description
DESCRIPTION OF THE INVENTION
This invention relates to a ground connecting clamp for coaxial
type cables.
An object of this invention is to provide an improved ground
connection for coaxial cables which may be manufactured
economically and efficiently.
Another object of this invention is to provide an improved ground
connection for coaxial cables which is weather proof and which is
easily installed on the cable.
Still another object of this invention is to provide an improved
ground connection in the form of a clamp for coaxial cables which
is provided with a grounding connection having a large contact area
with the sheath of the coaxial cable.
Still another object of this invention is to provide an improved
ground clamp for coaxial cables in which the grounding connection
to the cable is housed in a two-piece plastic housing that is
adapted to be assembled in weathertight fashion.
Another object of this invention is to provide an improved device
for removing a predetermined amount of insulation covering from the
coaxial cable to expose the metal sheath of the cable for contact
with the ground clamp connection.
Other and further objects of this invention will be apparent to
those skilled in the art to which it relates from the following
specification, claims and drawings.
In accordance with this invention, there is provided a ground clamp
for coaxial cables in which the ground connection to the metal
sheath of the coaxial cable is made of two flat metal strips that
are adapted to be clamped together and which are adapted to make a
rather large and broad contact with the metal sheath of the cable.
This contact with the sheath of the cable is housed in a plastic
housing that is made in two identical sections which are adapted to
be assembled in opposing relation and enclose the grounding
connection therein in a cavity provided for this purpose. The
housing sections are each provided with inturned ridges that engage
the outside plastic coating of the cable and provide a weathertight
seal therewith, when these sections are assembled and when they are
held upon a suitable support by the supporting screw provided
thereto.
In accordance with this invention there is also provided a tool
that is used for removing a predetermined length of the outside
plastic coating or covering from the coaxial cable so that a
suitable length of the metal sheath of the coaxial cable is
exposed. The grounding clamp provided in this invention is adapted
to be applied to this exposed part of the sheath. This tool when
properly used is adapted to remove the correct length of the outer
plastic coating of the coaxial cable for receiving the grounding
connection. Thus, by using this tool the operator will not remove
more of the plastic coating than is necessary. This is important
since removal of too great a length of this coating would impair
the proper sealing of the housing with the outer coating of the
coaxial cable.
Other and further features of this invention will be apparent to
those skilled in the art to which it relates from the following
specification, claims and drawings in which, briefly:
FIG. 1 is a perspective view showing this ground clamp installed on
a short length of coaxial cable;
FIG. 2 is a sectional view taken along the line 2-2 of FIG. 1;
FIG. 3 is a side view of the ground clamp shown in FIG. 1;
FIG. 4 is a top view of the ground clamp;
FIG. 5 is a plan view of the ground clamp with the top section of
the housing removed;
FIG. 6 is an end view of the tool used for removing a predetermined
length of the plastic covering from the cable;
FIG. 7 is a side view of the tool shown in FIG. 6; and
FIG. 8 is a fragmentary view showing the tool illustrated in FIG. 7
in position to slit the predetermined length of cable covering that
is to be removed from the cable.
Referring to the drawing in detail, reference numeral 10 designates
the housing of this ground clamp which may be made of suitable
plastic or other electrically insulating material. The housing is
made of two identical sections 11 and 12 which are adapted to be
assembled in opposing relation and which are held clamped together
by the supporting screw 13. The supporting screw 13 is of the
conventional wood or other type and it holds the housing clamped
against the supporting member 14 which may be a wooden member under
a building or on the side thereof or which may be a separate member
such as a post provided for this purpose.
The coaxial cable 15 is of conventional construction and it is
provided with an internal conductor 16 that is positioned
substantially in the center of the insulation 17. The sheath 18 of
the coaxial cable 15 is positioned on the outside of the insulation
17 and it is also of electrically conducting material. The sheath
18 may be made of a large number of small wires braided together to
lend flexibility to the cable. An outer coating or protective
covering 19 of insulating material such as plastic is provided on
the outside of the sheath 18.
A predetermined length of the outer covering 19 is removed from the
cable so that the contact members 20 and 21 made of metal may be
applied to the uncovered sheath 18. The contact members 20 and 21
are provided with substantially semicircular sections which are
adapted to be clamped in opposing relation around the exposed part
of the sheath 18 and held in this relation by the bolt 22. Also
when the housing sections 11 and 12 are assembled the portions
thereof which are opposite the members 20 and 21 are adapted to
engage these members and press them together when the screw 13
which supports the housing on a member 14, is tightened. These
edges 11a and 12a may be somewhat thinned and feathered so that
tightening of the screw 13 tens to make these edges bulge outwardly
slightly and provide a more effective weather seal with the members
20 and 21, respectively.
The housing sections 11 and 12 are provided with a cavity for
receiving a length of the coaxial cable. The ends of this cavity
have semicircular inturned internal ridges 11b--11c, and 12b--12c,
respectively, which are of substantially semicircular configuration
and which press into the outer plastic coating 19 of the coaxial
cable as shown in FIG. 2 to provide a weathertight seal between
these housing sections and the plastic coating 19 when the housing
sections 11 and 12 are assembled on the cable and the screw 13 is
tightened to hold the sections firmly together. The bolt 22 also
functions to anchor the ground wire connection 23 to the strips 20
and 21. The ground wire 23 is connected to a suitable metal rod or
post (not shown) which is inserted into the soil to provide a
grounding connection to the strips 20 and 21 and to the sheath 18
of the coaxial cable.
Both of the housing sections 11 and 12 are the same and they may be
made in the same cavity of a mold out of suitable plastic material.
Each of these sections is provided with a small pin or plug 24 as
shown in FIG. 5 which is molded integral with the housing section
and is located in a corner area of the housing section. An opposite
corner area of the housing section is provided with a hole or
recess 25. Thus, when a top section 11 of the housing is assembled
with the bottom section 12 of the housing the pin 24 of the top
section will be positioned in the hole 25 of the bottom section and
the pin 24 of the bottom section will be received in a hold 25 in
the top section. These pins and holes are made in relatively close
tolerances so that they insure substantially perfect alignment of
the top and bottom sections 11 and 12 when these are assembled.
The tool illustrated in FIGS. 6, 7 and 8 is provided for removing a
suitable length of the outer covering 19 of the coaxial cable to
expose the sheath 18 for receiving the contact strips 20 and 21.
This tool comprises two cutter devices 26 and 27 which are held
together by suitable spacers 28 and 29 and bolts 30 and 31. A
spacer 34a which is similar to spacers 28 and 29, is provided
around the pivoting bolt 34 of the cutter devices. Spacers 28 and
29 are in the form of suitable tubular members and the cutting
tools 26 and 27 are held in firm engagement against the ends of
these spacers by screws or bolts 30 and 31, respectively, which are
positioned in suitable holes provided in the handles of these
tools. Each of the cutting tools 26 and 27 is of conventional
construction and each is provided with a pair of handle members 32
and 33 shown in FIG. 7, which are pivotally held together by the
bolt 34 and spacer 34a. Sharp recesses 35 and 36 of substantially
arcuate configuration are provided to the jaws of members 32 and
33, respectively. When the coaxial cable is placed between the open
jaws of the two tools and these sharp recesses are brought together
upon the cable the outer covering 19 is cut thereby to provide the
cuts 19a and 19b as shown in FIG. 8. After the cuts 19a and 19b
which are separated along the length of the cable by a distance
somewhat larger than the width of the connecting strips 20 and 21
the cable is slightly bent as shown in FIG. 8 so that the cuts 19a
and 19b are opened or widened to permit insertion therein of the
points 37 and 38, respectively, of one side of the cutting tool.
The jaws of the cutting tool are then closed by pressing on the
handles thereof and the portion of the covering 19 between the cuts
19a, 19b is severed longitudinally. This portion of the covering 19
may then be removed by gripping one of the corners thereof and
pulling it off of the cable thereby exposing a part of the sheath
18.
While I have shown a preferred embodiment of the invention, it will
be apparent that the invention is capable of variation and
modification so that is its scope should be limited only by the
scope of the claims appended hereto.
* * * * *