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Патент USA US3058097

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Oct. 9, 1962
R. F. PIASECKI
3,058,087
GROUNDING CLAMP FOR ARMORED CONDUCTORS
Filed Dec. 2, 1960
'
INVENTORZ
?ay/2200a’
4c Pz'aseckz
@dww <9".
14770161467.’
rates atent
?iC?
3,058,087
Patented Oct. 9, 1962
1
2
3,058,087
and between the clamp and a water pipe or the like upon
GROUNDING CLAMP FOR ARMORED
CONDUCTORS
Raymond F. Piasecki, Hazlet, N.J., assignor to The
Thomas & Betts C0., Elizabeth, N.J., a corporation of
New Jersey
Filed Dec. 2, 1960, Ser. No. 73,290
1 Claim. (Cl. 339-95)
securing the clamp on said water pipe.
Various other objects, advantages and features of the
invention will become apparent from the following de
tailed description when read in connection with the
accompanying drawing, in which:
and associated armored ground conductor as secured on
a copper water pipe or the like;
The invention relates to ground clamps for electrical
FIGURE 2 is an end view of the same;
conductors and more particularly to a saddle clamp 10
FIGURE 3 is a side elevation of the grounding clamp
adapted for grounding a bare end portion of an armored
multi-strand or an armored solid copper conductor to a
copper water pipe or the like.
and associated armored ground conductor as assembled
and secured on a copper water pipe or the like;
FIGURE 4 is a fragmentary elevational view showing
More speci?cally, the invention relates to a ground
clamp of the character described which comprises a pair 15 the ground clamp in cross-section to illustrate the man
ner in which a bare end portion of an armored ground
conductor and the adjacent end portion of the armor
thereon is secured to and between the clamp and a copper
ing a machine screw threaded through each end of the
clamp whereby the said stampings are adapted to embrace 20 water pipe or the like;
FIGURE 5 is a perspective view of one half section
a water pipe and to be secured thereon by said screws, one
of similar sheet metal stampings each having an interme
diate portion of substantially V con?guration and includ
of said stampings including means for securing the bare
end portion of an armored ground conductor there
between, means for compensating for the difference be
tween the outer diameter of the ground conductor and
the outer diameter of its armor, and means for securing
the armor of said conductor against endwise movement
relative to said ground clamp and said conductor.
As known heretofore, ground clamps of this character
possessed certain disadvantages in that they were not
adapted for securing a bare end portion of an armored
ground conductor to and between one of such clamps
and a water pipe, while compensating for the di?erence in
the diameter of the conductor and the outer diameter of
of the ‘ground clamp which incorporates the integral
means for securing the bare end portion of a ground
conductor and the adjacent end portion of the armor
thereon; and
FIGURE 6 is a longitudinal sectional view of the
clamp section shown in FIGURE 5.
Referring to the drawing, the grounding clamp, gener
ally indicated at 10, comprises a pair of elongated, rec
tangular sheet metal stampings 12 and 14, of brass ‘for
example, each stamping having oppositely inclined sur
faces '16, of V-for-m centrally thereof throughout its
width, and its parallel side margins 18, ?anged normal
thereto for imparting rigidity thereto.
The stamping 12 is provided with a clearance opening
the armor thereon, nor for securing the armor against 35
20, adjacent each end thereof, and the stamping 14 with
endwise movement relative to the ground conductor and
an aligned screw threaded opening 22, adjacent each end
the ground clamp.
thereof for the reception of a pair of machine screws 24,
The present invention obviates the above noted disad
for adjustably connecting the respective stampings 12
vantages by providing a ground clamp wherein means are
provided integral therewith for receiving a bare end por 40 and 14, whereby they are adapted to be secured about
a copper water pipe 26, or the like.
tion of a ground conductor and the adjacent end portion
As clearly shown in FIGURES 1 through 4, the func
of the armor thereon in pre-determined relation therewith
tion of the ground clamp 10, is to secure ian armored
upon securing the ground clamp about a water pipe or the
grounding conductor 28, in approved electrical contact
like.
Accordingly, it is an object of the invention to provide 45 with the copper water pipe 26. .For this purpose, the
stamping 12, ‘as best shown in FIGURE 5, is provided
an improved grounding clamp for use with armored
with ‘an arcuate tongue 30 which is struck out of the
ground conductors which obviates the aforesaid disad
plane thereof across the root of its oppositely inclined sur
vantages.
faces ‘16, and arched inwardly centrally of said surfaces
Another object of the invention is the provision of a
16, with its severed free end 32, remaining in the slot 34,
ground clamp as speci?ed, wherein a bare end portion of
which free end resulted from the striking out of the tongue
an armored ground conductor is secured to and between
St), to provide a loop for the passage therethrough of a
one half section of the clamp and a water pipe or the
bare end portion 36 of the armored ground conductor 28.
like upon securing the clamp thereon.
To compensate for the difference in diameter between the
A further object of the invention is the provision of a
ground clamp as speci?ed wherein a ?rst means struck 55 bare end portion 36 of the ground conductor 28, ‘and its
spiral armor 28, a transverse protuberance or projection
out of the plane of one of the clamp sections, compensates
40, is formed integral with the upper face of the arcuate
for the difference between the diameter of the ground
tongue 30, centrally thereof for a purpose hereinafter de
conductor per se and the outer diameter of the adjacent
scribed.
end portion of the armor enclosing the same.
Another object of the invention is the provision of 60 The stamping 12, 'as best shown in FIGURE 5, is ‘also
provided with protuberance or projection 42, struck out of
a ground clamp as speci?ed wherein a second means
the plane of its V-forrnation 16, yacross the root thereof,
struck out of the plane of the aforesaid section of the
in laterally spaced relation to the arched tongue 30, and
two part clamp, in spaced axial alignment with the afore
at an angle corresponding to the pitch of the spiral con
said ?rst means, is adapted to seat between the spiral
convolutions of the armor on the grounding conductor 65 volutions of the armor on the ground conductor 28,
whereby the projection 42, is adapted to seat between the
to prevent endwise movement of the armor relative to
the clamp members and the ground conductor.
A further object of the invention is the provision of a
ground clamp as speci?ed wherein means integral with
one half section of the clamp is operable to automatically 70
'
FIGURE 1, is a plan view showing a grounding clamp
convolutions of the spiral armor 38, as best shown in ‘FIG
URES 1 and 4, to prevent endwise movement thereof rela
secure a ‘bare end portion of an armored ground conduc
tive to the stamping 12, and ground conductor 36, after
the ground clamp 10, with the armored ground conductor
28, properly positioned therein, has been secured about
tor and the adjacent end portion of the armor thereon to
the copper water pipe 26.
8,058,087
3
From a consideration of FIGURES 2 and 4, it will be
readily apparent that in securing the clamp 10, with the
armored ground conductor 28, properly inserted there
between, the ?nal adjustment of the screws 24, forces the
arched tongue 30, into intimate bearing engagement with
the bare end portion of the ground conductor 36, and
end 36 into intimate bearing engagement with the stamp
41.
whereby said stampings are adapted to substantially em
brace a cylindrical conduit in biting engagement there~
with, an arcuate tongue struck out of the plane of one of
said stampings centrally of and at the base of its inclined
‘surfaces for receiving a bare end portion of an armored
ground conductor therethrough, and a rounded protuber
ance raised out of the plane of said one stamping in
spaced alignment with said arcuate tongue and ‘at an angle
ing 12, at the root 'of its V-surfaces 16, whereby an ap
thereto corresponding to the pitch of the spiral armor of
proved ground connection is made with the copper water
10 said ground conductor, said tongue and said protuberance
pipe 26, or the like.
being adapted respectively to clamp said bare conductor
As shown in FIGURE 5, the inner faces of the inter
end portion to said one stamping ‘and to secure the spiral
mediate V-surfaces of the stamping 12, are provided with
armor of said ground conductor against endwise move
a plurality of parallel linear serrations or score markings
ment relative to said one stamping upon securing said
44, to provide roughened surfaces adapted to substantially
bite into the periphery of the copper water pipe 26, about 15 clamp on said cylindrical conduit, and a transverse sub
stantially rectangular projection integral with said arcuate
which the clamp 10, is secured for the purposes set
tongue centrally of its outer periphery adapted to com~
forth.
pensate for the dilference between the diameter of the
While the invention has been illustrated and described
bare end portion of said ground conductor and the outer
with respect to a preferred embodiment thereof, it is to be
diameter of its spiral ‘armor.
expressly understood that various changes and modi?ca
tions may be made therein without departing from the
inventive concept underlying the same. Therefore, the
References Cited in the ?le of this patent
invention is not to be limited except as is necessitated by
UNITED STATES PATENTS
the prior art and the scope of the appended claim.
1,914,010
Eccles _______________ __ June 13, 1933
What is claimed is:
25
2,490,253
Buchanan ____________ __ Dec. 6, 1949
A saddle clamp for grounding an ‘armored conductor
2,533,897
Reddock ______________ __ Dec. 12, 1950
on a cylindrical conduit comprising a pair of ?anged sheet
metal stampings, a pair of machine screws adjustably con
FOREIGN PATENTS
necting said stampings at their respective end portions,
each of said stampings having a pair of oppositely in 30 23,579/29
clined surfaces formed centrally thereof provided with
528,644
spaced, parallel linear scorings lengthwise thereof
Australia _____________ .. May 28, 1930
Canada _______________ __ Aug. 7, 1956
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