U.S. patent number 3,892,455 [Application Number 05/454,977] was granted by the patent office on 1975-07-01 for ground clamp connector.
This patent grant is currently assigned to Thomas & Betts Corporation. Invention is credited to Thomas J. Sotolongo.
United States Patent |
3,892,455 |
Sotolongo |
July 1, 1975 |
Ground clamp connector
Abstract
The invention is directed to improvements to standard ground
clamp connectors wherein there are provided additional nests in the
body and cap portions in order to accept additional conductors in
the additional wire receiving cavities formed. Such additional wire
receiving cavities permit the connection of a single ground
conductor to a grounding point, such as a ground rod or cold water
pipe or the coupling of two grounding conductors. A further
conductor receiving cavity is provided in the cap portion by
providing an additional conductor receiving nest and clamping
member associated therewith whereby three grounding conductors may
be coupled together or in the more usual arrangement a grounding
conductor may be coupled to a ground point and an appliance
grounded by means of the same connector without the usual
requirement for further connecting means for such appliances.
Inventors: |
Sotolongo; Thomas J. (Red Bank,
NJ) |
Assignee: |
Thomas & Betts Corporation
(Elizabeth, NY)
|
Family
ID: |
23806856 |
Appl.
No.: |
05/454,977 |
Filed: |
March 26, 1974 |
Current U.S.
Class: |
439/100; 439/803;
439/781 |
Current CPC
Class: |
H01R
4/643 (20130101); H01R 4/44 (20130101) |
Current International
Class: |
H01R
4/38 (20060101); H01R 4/64 (20060101); H01R
4/44 (20060101); H01r 003/06 () |
Field of
Search: |
;339/13,14L,32,246,264R,264L,266R,266G,266L |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
1,086,774 |
|
Aug 1960 |
|
DT |
|
718,832 |
|
Mar 1942 |
|
DT |
|
Primary Examiner: Lake; Roy
Assistant Examiner: Bicks; Mark S.
Attorney, Agent or Firm: Teschner; David Woldman; Jesse
Claims
The embodiments of the invention in which an exclusive property or
privilege is claimed are defined as follows:
1. A clamp for electrically and mechanically connecting together at
least two electrical conductors comprising: a first generally
arcuate jaw member having a first end, a second end and a first
recess defined by a plurality of V-shaped teeth therebetween; said
first jaw member having a first nest adjacent said first end and a
second nest adjacent said second end; a second generally arcuate
jaw member having a first end, a second end and a second recess
defined by a plurality of V-shaped teeth therebetween; said second
jaw member having a third nest adjacent said first end of said
second jaw member and a fourth nest adjacent said second end of
said second jaw member; said first and second nests lying serially
within the curvature of said first jaw member, and said third and
fourth nests lying serially within the curvature of said second jaw
member; said second jaw member first end terminating in a
bifurcated turned up portion having an inner surface and extending
selectively forwardly of said first jaw member first end, said
third nest being defined by said second jaw member turned up
portion inner surface and lying serially within the curvature of
said second jaw member; and selectively operable fastening means
pivotally coupling said first and second jaw members together
whereby at least two electrical conductors placed in the conductor
receiving cavities formed by said first and second recesses, said
first and third nests and said second and fourth nests are coupled
together when said selectively operable fastening means is
tightened appropriately.
2. A clamp as defined in claim 1, further comprising: a fifth nest
on said first jaw member adjacent said first end thereof, said
fifth nest being in a surface of said first jaw member opposite to
the surface containing said first nest; clamping means positioned
adjacent said fifth nest; and additional selectively operable
fastening means coupling said clamping means to said first jaw
member to electrically and mechanically join an electrical
conductor to said clamp whereby at least two electrical conductors
placed in the conductor receiving cavities formed by said first and
second recesses, said first and third nests, said second and fourth
nests and said fifth nest and clamping means are coupled together
when said selectively operable fastening means and said additional
selectively operable fastening means are selectively operated as
required.
3. A clamp as defined in claim 2, wherein said clamping means has
anti-rotational means thereon to prevent rotation of said clamping
means as said additional selectively operable fastening means is
operated.
4. A clamp as defined in claim 3, wherein said anti-rotational
means comprises a plurality of teeth arranged to engage and bite
into the surface of said first jaw means as said additional
selectively operable fastening means is operated to hold an
electrical conductor in said fifth nest with said clamping
means.
5. A clamp as defined in clamp 2, wherein the conductor receiving
cavity provided between said first and second recesses are
dimensioned to accept a range of conductor diameters larger than a
predetermined dimension and said conductor receiving cavities
provided between said first and third nests, said second and fourth
nests and said fifth nests and clamping means are dimensioned to
accept a range of conductor diameters smaller than said
predetermined dimension.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to the field of grounding generally and
more particularly to the grounding of ground conductors and
appliances to a common ground point.
2. Description of the Prior Art
Prior art grounding clamp connectors are exemplified by U.S. Pat.
No. 2,679,032, issued May 18, 1954, to G. C. Thomas, Jr. et al and
owned by the assignee of the instant invention. In such patent
there is shown a ground clamp consisting of a body portion and a
cap portion assembled to one another by means of a bolt and nut
arrangemend to provide a major wire receiving cavity defined by
V-shaped tooth recesses and arranged to accept a wide range of
large size conductors such as ground rods or water pipes therein.
Also provided is a small nest for receipt therein of a smaller
diameter conductor which is generally the conductor to be grounded.
Thus for a single clamp, one wire may be connected to a source of
ground and if a number of devices must be connected to the ground
point then a plurality of such clamps will be employed. Because of
the construction shown, a conductor of large size can only be
joined to one of smaller size or diameter. It is not possible to
merely join two conductors of similar diameter with such a
connector.
SUMMARY OF THE INVENTION
The present invention overcomes the difficulties noted above with
respect to prior art clamps of the type shown in the G. C. Thomas,
Jr. et al patent by providing a ground clamp connector capable of
assembling two ground conductors to a grounding point to permit the
tying together of two or three ground conductors to a single point
as where branching is necessary or desirable. This is accomplished
by providing an additional nest in both the body and cap portions
of a ground clamp connector of the type shown in the prior art,
which nests cooperate to provide a conductor receiving cavity
therebetween. Additionally, a further nest is provided in the cap
member and a second wire receiving cavity is provided by
positioning a clamping member adjacent such further nest wherein a
further conductor may be coupled to the cap portion of the
connector. By the inclusion of these additional nests it is now
possible to use the ground clamp connector to clamp two grounding
conductors to a grounding point or to connect together two or three
conductors at a single point. It is therefore an object of this
invention to provide an improved ground clamp connector.
It is another object of this invention to provide an improved
ground clamp connector having additional nests to permit the
connecting of two electrical conductors to a ground point.
It is another object of this invention to provide an improved
ground clamp connector having a plurality of conductor receiving
cavities wherein at least two conductors may be connected
together.
Other objects and features of the invention will be pointed out in
the following description and claims and illustrated in the
accompanying drawings, which disclose, by way of example, the
principles of the invention, and the best mode which has been
contemplated for carrying it out.
BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings in which similar elements are given similar
reference characters.
FIG. 1 is a side elevational view of a ground clamp constructed in
accordance with the concepts of the prior art and which appears as
FIG. 6 of U.S. Pat. No. 2,679,032, issued May 18, 1954.
FIG. 2 is a side elevational view of a connector constructed in
accordance with the concepts of the invention.
FIG. 3 is a top plan view of the connector of FIG. 2.
FIG. 4 is a bottom plan view of the connector of FIG. 2.
FIG. 5 is a side elevational view of the connector of FIG. 2
installed to a single conductor and a grounding point.
FIG. 6 is a side elevational view of the connector of FIG. 2
showing the same installed upon a grounding point and coupled to
two additional electrical conductors.
FIG. 7 is a side elevational view of the connector of FIG. 2
showing the same coupled to two electrical conductors.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In FIG. 1 there is shown a grounding clamp connector 10 constructed
in accordance with the prior art which appears as FIG. 6 in U.S.
Pat. No. 2,679,032, issued May 18, 1954. Ground clamp connector 10
is constructed of a body portion 12 and a cap portion 14 assembled
by means of a fastening device made up of a bolt 16 and a nut 18.
Body portion 12 has a V-toothed recess 20 which cooperates with a
similar V-toothed recess 22 in the cap portion 14 to hold
therebetween various diameter ground devices such as ground rods or
a water pipe 24 as shown in the figure. A further wire receiving
cavity is formed between the nest 26 of the body portion 12 and the
corresponding nest 28 in the cap portion 14, in order to secure
therein a conductor 30. With this arrangement it is possible to
take a single grounding conductor 30 and couple same to a grounding
device such as the cold water pipe 24. If it is required to connect
additional devices to the grounding device 24, additional clamps of
the type shown in the figure are required.
Turning now to FIGS. 2, 3 and 4 it is possible to couple a further
conductor to a grounding point by means of the connector 40, shown
in FIG. 2. The connector 40 is constructed of a body portion 42
having a recess 44 defined by a series of V-shaped teeth 46.
Adjacent the first end of the body portion 42 is a nest 48 which
will form a portion of a conductor receiving cavity, as will be
described below. Adjacent the second end of the body portion 42 is
a further nest 50. The tail end of the body portion 42 is
bifurcated as at 52 (see FIG. 4) to provide a guide slot for the
tail of the cap member, as will be described below. Ribs 54 are
formed along the bottom surface of the body portion 42 to add
strength and also to provide an antirotational trap for the nut 56
of the fastening device to be described below.
A cap portion 60 is provided with a V-toothed recess 62 defined by
a series of V-shaped teeth 64. With the cap portion 60 properly
placed with respect to the body portion 42, recesses 44 and 62 will
be properly aligned to provide a conductor receiving cavity capable
of accepting grounding devices of varying diameters, such as ground
rods or water pipes. Adjacent a first end of the cap portion 60 is
a nest 66 which cooperates with the nest 48 of the body portion 42
to form a conductor receiving cavity therebetween. Similarly, at
the opposite end of the cap portion 60 is a nest 68 which will
cooperate with the nest 50 of body portion 42 to form another
conductor receiving cavity therebetween. The conductor receiving
cavities created between the nests 48 and 66, 50 and 68,
respectively are arranged to handle conductors of far smaller
diameter than the conductor handled by the conductor receiving
cavity created by the recesses 44 and 62. Cap portion 60 terminates
in a tail portion 70 (see FIG. 3) arranged to fit between the
bifurcated tail end 52 of the base portion 42. In this manner, the
relative alignment of the base portion 42 with the cap portion 60
is established and maintained during installation. The assembly and
coupling together of the base portion 42 and cap portion 60 is
provided by means of a fastening device which may be in the form of
a bolt 72 fitting within a slot 74 (see FIG. 3) in the cap portion
60, extending through a slot 58 (see FIG. 4) into the nut 56
positioned between the ribs 54 of the base portion 42.
Strengthening ribs 76 are provided on the cap portion 60. A nest 78
extends through the ribs 76 and may, if desired, be formed
partially in the material of the cap portion 60. The nest 78
cooperating with a clamping member 80 fastened to the cap portion
60 by means of a fastening screw 82 provides an additional
conductor receiving cavity for the receipt of a grounding conductor
of a diameter similar to that which will be placed within the
conductor receiving cavities created by the nests 66 and 48, 68 and
50, respectively. The end of the clamping means 80 remote from the
nest 78 is provided with a series of serrations, as at 84, (see
FIG. 3) which permits the engagement of the clamping means 82 with
the cap member 60 as the fastening means 82 is tightened and
prevents the rotation of the clamping member 80.
Turning now to FIG. 5 there is shown the connector 40 of FIG. 2
employed to couple a ground conductor 30 to a water pipe 24 of a
diameter much greater than conductor 30. Conductor 30 is placed in
the conductor receiving cavity formed by the nest 50 of the body
portion 42 and nest 68 of the cap portion 60. The ground conductor
24 is introduced within the conductor receiving cavity created by
the recesses 62 of cap portion 60 and 44 of the body portion
42.
In FIG. 6 the water pipe 24 used for grounding is replaced by a
ground rod 86 of smaller diameter and a conductor 30 is placed
within the conductor receiving cavity created by the nest 68 of the
cap portion 60 and nest 50 of the body portion 42. In addition, a
further conductor 88, which may be from an appliance to be
grounded, is introduced within the nest 78 and held in position by
means of the clamping member 80 with a fastening device 82
tightened appropriately.
In FIG. 7, the connector 40 is employed to couple together the
conductor 30 and a further conductor 90 placed within the conductor
receiving cavity created by the nest 46 of the body portion 42 and
the nest 66 of the cap portion 60. In this arrangement, it is
possible to couple together two conductors of relatively the same
diameter as that shown by the conductors 30 and 90. Additionally,
if it is desired, a further conductor may be inserted within the
nest 78 to permit the connector 40 to couple together three
conductors of similar diameter for branching or other similar
grounding functions.
While there have been shown and described and pointed out the
fundamental novel features of the invention as applied to the
further embodiment, it will be understood that various omissions
and substitutions and changes of the form and details of the device
illustrated and in its operation may be made by those skilled in
the art, without departing from the spirit of the invention.
* * * * *