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Патент USA US2112053

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March 22, 1938.
. -
e. c. THOMAS. JR
.
2,112,053
GROUNDING FITTING
Filed Sept. 24, 1955
2 Sheets-Sheet l
25
34
34
INVENTOR
GEORGE C; THOMAS JR.
Match 22, 1938-
G. c. THOMAS, JR
2,1 12,053v
GROUNDING FITTING'_
Filed Sept. 24, 1935
2\Sheets—'Sheet 2
w.o_h .
EOE
9 E»
INVENTOR
GEORGE G.
yMAS JR .
ATTORNEYS
2,112,053’
PatentedvMar. '22, 1938
UNITED" STATES PATENT * OFFICE
_
2,112,058
'
GBOUNDING FITTING
George C. Thomas, Jr., Westiield, N. 1., assignor '
to' The Thomas & Betta-Cm, Elizabeth, N. 1., a
corporation of New Jersey
'
.
Application September 24, 1935, Serial No. 41,847‘
'
,
11 Claims.
-(Cl. 173-273)
The invention relates to a grounding ?tting by
'
tact with the grounding ?tting and is clamped
means of which a wire which is connected with I in position in its bearing upon tightening oi’ the
electrical apparatus may be grounded tov a me—. grounding ?tting upon an electrical conductor.
tallic conductor, such as a water pipe, grounding It the ‘wire is covered with insulation instead of
5 rod, many other means which is provided for , armor, then the insulation is gripped in the
establishing electrical connection with the ground.
" The invention relates particularly to a ground
ing ?tting in which the wire to be grounded serves
as its own hinge pin for the clamping members
‘ 10* which grip the grounded electrical conductor. Be
cause of the fact that the wire to be grounded
serves as a hinge-pin, it is ?rmly pressed into
contact with the two clamping members of the
grounding ?tting and thereby establishes a good
15. electrical contact with both members. Other ele
ments of the invention will be more apparent‘
from the following statement of objects.
It is an object of the invention to construct a
grounding ?tting in which the wire to be grounded
20 serves as the fulcrum pin for two pivotally coop
erating clamping members. The wire serves par‘
ticularly as its own hinge pin for two clamping
members which are hinged'together by the wire
and forced towards each other in order to grip
V 25' a grounded electrical conductor therebetween.
The user may select one of a plurality of positions
relatively to a. clamping seat upon a clamping
member and thereby adapt the ?tting for dif
ferent sizes of conductors or pipes.
30' Another object of the invention is to construct
a grounding ‘?tting in which the wire to‘ be
grounded serves as its own hinge pin between
the two clamping members forming part of the
grounding ?tting and in which at least one of
bearing.
"
.
'
-
Another object of the invention is to devise a
grounding ?tting having two clamping members,
at least one of which carries a plurality of hinge
bearings for receiving, as a hinge pin, the wire 10
to be grounded so that the grounding ?tting is
adapted for various sizes of electrical conductors,
and to reeni’orce the portion carrying the plu
rality of hinge bearings, at the point where this
portion joins the portion of the clamping member 15
having the clamping seat, with a rib which-ex
tends lengthwise of ‘the clamping ‘member and
serves also as a holding means for the head of
an operating bolt by which the clamping members
are forced together to grip the electrical conduc
tor to which the wire is adapted to be grounded. 20
A further object of the invention is to construct
a grounding ?tting having an insertable clamping
seat by which the grounding ?tting is adapted to _
clamp a smaller size of electrical conductor than 2
that which the grounding ?tting is capable of 5
receiving and clamping without the insertable
_ clamping seat.
Other objects of the invention will be more ap
parent from the following description taken in
connection with the accompanying drawings 30
showing the‘ preferred embodiments of the inven
tion, in which:
_
V Figure 1 is an exploded view ‘of the two clamp
35 the clamping members is provided with a pin
ing members of the grounding ?tting preparatory
rality of hinge bearings so that the one ground
ing ?tting is adapted to clamp various sizes of
to being assembled upon a grounded metallic con
ductor which in the illustration is shown as a pipe.
pipes, rods, and other grounded electrical conduc
tors merely by selecting the hinge bearing‘ best
assembled and gripping the grounded pipe. The
e 40 suited for the size of grounded conductor to'which
the ?tting is to be clamped.
_
Another object is to devise a reeni’orcing mem
her for the wire to be grounded at the point where
it serves as a hinge pin 1 or the two clamping mem
45 bers of the. grounding ?tting and which rceni’orc
ing means also serves as a retaining means for
holding the two clamping members of the ground
ing ?tting together prior to the use of the ground
_ ing ?tting in service.
50
'
'
A'still further object is to construct a grounding
?tting in which the wire.to be grounded serves
as its own hinge pin for the two clamping mem
bers and which ?tting is provided with a bearing
Figure 2 is a side view of the grounding ?tting
wire to be grounded is inserted in ‘one of the 40
plurality of hinge bearings provided so that it
serves as a hinge pin for the two clamping mem
bers.
-
.
Figure 3 is a top view‘oi the grounding ?tting, '
or as viewed from the left-hand side of Figure 2', 45
with a grounded pipe gripped therein and the
wire to be grounded serving as a hinge pin be
tween the two clamping members.
‘
Figure 4 is a'view from the other side of the
grounding ?tting shown in Figure 2, or from the 50
right-hand side of the latter view.
’
Figure 5 shows the grounding ?tting with the
wire to be grounded inserted in another of the‘
for the armor surrounding the grounding wire hinge bearings so that the grounding ?tting is
55 so that the armor also establishes electrical con ‘adapted to grip a smaller diameter of grounded 55
2,112,058
' 2
conductor which is shown as being a smaller
diameter of pipe than that shown in Figures 1
through 4.
I
Figure 6 shows a clamping seat which is insert
able into position over the clamping seat of one
of the clamping members of the grounding ?t
ting so that the grounding ?tting is capable of
gripping a smaller diameter grounded conductor
than that which the grounding ?tting is other
10 wise adapted to receive and clamp.
Figure 7 is a front view of the insertable clamp
the single hinge bearing which is particularly the
clamping member 20 having the single hinge
bearing 24-. The other end of the clamping mem
ber 20 carries a recess 26, which is preferably a. 10
sertable clamping seat of Figure 6.
Figure 9 is an assembly view of the grounding
?tting with the insertable clamping seat of Fig
ure 6 in position in the grounding ?tting and
surfaces carry serrations 33 identical with the
serrations 23 carried by the clamping member 20.
Figure 8 is a view showing the back of the in
gripping a smaller diameter of grounded con
ductor.
'
Figure 10 is a cross section through the hinge
bearings of the grounding ?tting, taken on line
Iii-l0 of Figure 9, and shows how the grounding
wire is gripped in the hinge bearings in contact
with both clamping members.
Figure 11 is a top view of the grounding ?tting
of Figure 9 showing the manner in which the
insertable clamping seat is secured in position
and also showing a section through the hinge
bearings with the grounding wire serving as the
30 hinge pin and the grounding wire being strength
ened or stiffened by a reenforcing bushing.
Figure 12 is a front view of the reenforcing
means or bushing which is insertable over a
smaller diameter wire and serves to reenforce the
35 wire as a hinge pin and also serves to retain the
two clamping, members together in assembled re
lation when the grounding ?tting is not in use.
Figure 13 is an end view of the reenforcing
40
lation covering with which the grounding wire
may be covered. Many wires, however, are not
covered. The wire covering bearing 25 is pro
vided with the clamping member which carries
hole, in order to receive an operating means 21,
such 'as the bolt shown in Figure 2.
The other clamping member 2| is also provided
with a clamping seat 32 which is again formed
ing seat of Figure 6.
18
provided in substantial alignment with the hinge
bearing 24 in order to receive the armor or insu
hinge bushing of Figure 12.‘
The grounding ?tting of the invention provides
a ‘simple construction by making the grounding
wire serve as its own hinge pin or fulcrum be
tween the two clamping members which grip the
grounded electrical conductor to which the wire
45 is to be electrically connected. Grounding ?ttings
generally provide a separate means for securing
the grounding wire to the grounding ?tting and
such separate means is dispensed with in the con
struction herein. Again, the grounding wire in
50 serving as the hinge pin for the two clamping
members of the grounding ?tting also establishes
direct electrical contact with the two clamping
parts of the ?tting so that a better electrical
ground is established. As a matter of fact, a
55 double grounding path is provided through each
clamping member of the ?tting. The grounding
?tting of the invention also lends itself easily and
readily and with a minimum number of parts to
grip grounding conductors of many different sizes
60 and shapes.
The grounding ?tting includes two clamping
members 20 and 2| which are hinged together
with the grounding wire W serving as the hinge
pin. The clamping member 20 is provided with
65 a clamping seat 22 formed by the angularly dis
posed faces which carry serrations 23 for biting
into the surface of the grounded conductor C,
which is shown as a pipe in this ?gure. The ser
rations enable the pipe to be more ?rmly gripped
and a better electrical connection is established
preferably by angularly disposed siu'faces. which 15
The clamping member 21 carries at least one ex
tension 34 which preferably extends substantially
at right angles to the general plane of the clamp 20
ing member. Two such extensions are illustrated
spaced from each other and it is clear that only
one or more than two may be provided if desired.
Each extension 34 is provided with a plurality of
hinge bearings which are spaced from each other 25
on the extension. The preferred form of each
hinge bearing is again a hole, there being three
holes 35, 36 and 31 provided in each extension 34.
The purpose of these spaced hinge hearings will
be discussed more fully hereinafter. The other 30
end of the clamping member 2| carries a recess
38-, which is preferably a hole, to receive the op
erating means, such as the bolt or screw 21 shown
in Figure 2.
'
The clamping member 2i has a pair of reen 85
forcing ridges 42, one of which extends from or
forms a continuation of and merges with each
extension 3d and then passes over the back of
the clamping member 2! and widens out a spaced
distance on either side of the hole 38 for the 40
operating means. These spaced ?anges or ridges
42 are spaced apart a distance so that the head
28 of the operating bolt 21 is received therein and
retains the bolt against turning.
Reenforcing
ridges 43 are also provided upon the back of the 45
clamping member 2B, but they do not straddle
the hole 28.
The hinge bearing or hole 31 is adapted for
clamping a one inch grounded pipe as shown in
Figures 1 through 4. The hinge hearing or hole 50
at is intended for three~quarter inch pipe, al
though a three-quarter inch pipe is shown in
Figure 5 as being gripped from the hinge hole 35.
The hinge hole 35 is intended for one-half inch
pipe. It is evident that the plurality of hinge 55
holes 35, 3E and 31 are adapted to clamp more
than one size of pipe so that the three hinge holes
provide considerable latitude in the sizes of pipes
or rods to be received and clamped between the
clamping seats 22 and 32.
60
The operating means for forcing the clamping
members together to grip a grounded conductor
preferably includes the bolt or screw 21 having
a square head 28, the ?at sides of which are
received between the flanges 42 and prevented 65
from turning thereby. An operating nut 45 is
received on the bolt or screw 21. This operating
means is preferably carried upon the grounding
?tting and passes through the bolt holes 26 and
38 in the ends of the respective clamping mem 70
bearing 24, which is preferably a hole,- is disposed
bers 20 and 2|, as previously described. Any
other operating means for forcing the clamping
members together to grip the grounded conductor
at one end of the clamping member 20. A wire
is contemplated.
by the serrations digging through any scale or
dirt upon the surface of the conductor. A hinge
75 covering bearing 25 in the form of a bushing is
.
The operation of the grounding ?tting will 75
3
3,112,053
now be described. A ground wire to be-electrb‘
this possibility, a reenforcingmeans 58 is. pro
‘ 'cally grounded to the metallic conductor 0 is vided which is also projected through ‘the hinge
inserted through- the hinge bearing 24 on the bearings with thegrounding wire. As illustrated
clamping member 20 and through one of-the in Figures 12 and 13, this reeniorcing means is
hinge bearings‘ 35, 36 or 31 on the clamping preferably tubular or a bushing and collapsible
member 2|. This ground wire forms a hinge so that under pressure in the hinge bearings, the
pin between the two clamping members which‘ bushingcontracts or collapses and the grounding
v5
are hingediy secured together thereupon. A wire W is securely anchored within the bushing
metallic conductor, such as the pipe 0, is then
10 positioned between the clamping seats 22 and 32,
and the operating bolt 21 is passed through the
holes 26 land 38 whereupon tightening of the'op
crating nut 45 securely clamps. the metallic con
ductor cwwithin the grounding ?tting and secures
15 the grounding wire W in the hinge bearings.
Figure 10 illustrates the manner in which 'the
grounding wire W is clamped in the hinge bear
ingsxand the manner in which effective electri
cal contact is established between the wire and
20 each of the clamping‘members 20 and 2!. It will
be observed from Figure 10 that the hinge bear
ings when clamped engage only one side of the
hole and consequently illustrates that holes-are
‘not essential for/hinge bearings.
'
25 > Some grounding wires, and‘, particularly the
smaller sizes of grounding wires. carry an insu
~ lation or particularly a spirally wound metallic
armor R as shown in Figure 10. A bushing or
armor bearing 25 is provided having a bore 49
Upon
tightening of the operating nut M5, the side of
the bore 49 grips the armor and establishes elec
30 which is adapted to receive the armor R.
trical connection therewith and also secures the
armor within the bushing or sleeve. The bush
35 ing 25 also provides a covering for the ragged
and the latter and wire are both ?rmly clamped
in the hinge‘ bearings. Good electrical contact is 10
therefore established between the wire W and
the clamping members 20 and 2!.
, vThe collapsible reenforcing means 58, particu;
larly illustrated, is tubular and is rendered con‘
tractile by a slot or particularly by rolling a ?at 15
plate circularly so ‘that the ends thereof overlap. ' With this. type or collapsible reenforclng means,
vthere is nosubstantial deformation of the reen
forcing means, other than circularly, so that the
reenforcing means 58 substantially engages the 20
entire circumference of the grounding wire W.'
'I'his'reenforcing means is shown in position in
Figures 10 and 11 and under the clamping action
of the operating means 21,‘ 45, both“ the reen
‘forcing means and the wire are gripped within 25
the hinge bearings.‘
'
The reenforcing means 58, in addition to reen
forcing a, smaller diameter grounding wire W,
also serves to retain the hinge portions of the
clamping members 20 and 2! in hinged relation 30'
when in transit or boxed or at any time when the
grounding ?tting is not in use. The reenforc
ing member is merely inserted in the hinge bear
ing it and any one of the hinge bearings 35, 36
or 31 upon the clamping member 2! and this 35
retains the hinge portions of the two clamping
In order "to adapt the grounding ?tting for even members together. Any other type of reenforc
end of the armor.
,
'
smaller diameters or sizes of pipes, rods or-other
metallic conductors, an insertable clamping seat
40 Ellis provided as illustrated in Figures 6, 7 and 8.
This insertable c'lampin-gseat has angularly dis
posed clamping surfaces 5! having serrations 52
for, biting into the pipe or rod. This clamping
seat W carries means for securing the seat in
place'upon one of the clamping members. Any
desirable securing means may be utilized, that ‘
ing means is contemplated, as well as any other
means which is insertable within the hinge bear
ings in order to retain the hinge portions of the 40
two clamping members 20 andll in assembled
relation. ,
The invention has been illustrated as having
two clamping‘members 20 and 21 vone of which,
namely 20, is provided with a ‘single hinge bear 45
ing 24 and the other 2| is provided with a plu
illustrated comprising a pair‘of bendable tabs 53 rality of hinge bearings 35, 36 and 31. It is to
projecting from the clamping seat, which tabs be understood that each clamping member’may
project beyond the edge of the clamping member I be provided with a plurality of hinge bearings and
50 2| so that the tabs may be bent thereovenas
illustrated in Figures 10 and 11, to secure the
this form is contemplated herein. Again, in 50
the form particularlyv illustrated, the relation‘ of
clamping seat, hinge and operating means. is that
insertable clamping seat in position. The edges
5d of the insertable clamping seat 59 ‘engage a of a lever of the second class. It is within the
serration 33 on each angular face of the clamp
province‘of the invention to position these parts
55 ing seat 32 and the clamping seat is retained in
with respect to each other so as to havea rela 55
position against shifting by the serrations. Also tion of levers of the ?rst and third class.
the sides 55,01‘ the insertable clamping seat 50
Various modi?cations will occur to those skilled
engage the sides of the clamping member 2| and , in the art in the con?guration, composition and
the insertable clamping seat is additionally sup
disposition of the component elements going to
60 ported in position by this engagement. A half ‘make up the invention as a ‘whole, as Well as in
inch rod is shown in Figure 9 as being clamped‘ the selective combination or application of the
within the grounding ?tting utilizing .the in
respective elements, and no limitation is in—.
sertable clamping seat 50. It is clear that by
properly proportioning the insertable clamping
65 seat, smaller diameters of pipes or rods as well
as various shapes of pipes and rods may be
clamped within the grounding ?tting. It is clear
also that, if desired, an insertable clamping seat
may be used for each of the clamping members
20 and 2!,
'"
-'
* If the grounding wire W to be clamped with
in the hinge bearings Hand 35, 36 or 31 is rela
tended by the phraseology- ofthe foregoing description or illustrations‘ infitheaccompanying
drawings.
'
.
,
What is claimed is:
"
"
1
'
“
65
'
“
1. A grounding ?tting for' a grounding wire
comprising clamping ‘members; ‘a plurality of
hinge bearings upon one of the clamping mem
bers spaced in different axes with respect to each 70
other, one of said hinge ‘bearings being adapted
to receive a wire to be grounded and the others - '
tively small, there is some possibility that such‘ ‘oflwhich receive the ground wire for conductors
small wire may be sheared off ‘if the operating
75 nut 45 is securely tightened. In order to avoid
of different sizes, at least one hinge bearing upon
another clamping member to ~ also receive the
2,119,053
thereof, a plurality of spaced hinge holes in the
extension means, a hinge hole in the other clamp
ing member which hinge hole and one of those
which wire serves as a pin to hingedly secure the
clamping members together, clamping seats
15 upon the clamping members between which a
metallic conductor is adapted to be clamped, op
erating means to force the clamping members to-v
gether to grip a metallic conductor between the
clamping seats and grip the grounding wire
20 against the hinge bearing, and a. reeniorcing
means adapted to be placed in contact with the
wire and inserted in the hinge hearings to re
enforce the wire and to retain the hinge bearings
together.
3. A grounding ?tting for a grounding wire
comprising clamping members each having a
hinge bearing to receive a wire to be grounded
which wire serves as a pin to hingedly secure the
so
clamping members together, clamping seats
upon the clamping members between which a
metallic conductor is adapted to be clamped, op
erating means to force the clamping members to
gether to grip a metallic conductor between the
seats and grip the grounding wire against the
35 hinge bearings, and a contractile tubular reen
forcing means received in the hinge bearings and
adapted to receive the grounding wire therein to
reenforce the wire and also to retain the clamp
ing members together when not in use.
40
4. A grounding ?tting for a grounding wire
comprising clamping members each having a
hinge bearing to receive a wire to be grounded
which wire serves as a pin to hingedly secure the
clamping members together, a receiving bearing
45 for a wire cover carried by one of the clamping
members and located in substantial alignment
with the hinge bearing, clamping seats upon the
clamping members between which a. metallic
conductor is adapted to be clamped, and operat
50 ing means toiorce the clamping members to
gether to grip a metallic conductor between the
seats, the grounding wire against the hinge bear
ing and the wire covering in the cover receiving
55
.
between the clamping members, clamping seats
upon the clamping members between which a
metallic conductor is adapted to be clamped, and
operating means to force the clamping members
together to grip the metallic conductor between
the clamping seats and grip the grounding wire
against the hinge bearings in which the ground
ing wire is received.
10, 2. A grounding ?tting for a grounding wire
comprising clamping members each having a
hinge bearing'to receive a wire to be grounded
25
1
grounding wire which wire serves as a hinge pin
bearing.
5. A grounding ?tting for a grounding wire
comprising clamping members, extension means
carried by one clamping member and extending
substantially at right angles to the general plane
thereof, a plurality of spaced hinge holes in the
00 extension means, a hinge hole in the other clamp
ing member which hinge hole and one of those
in the extension means are adapted to receive a
wire to be grounded which wire serves as a hinge
pin between the two clamping members, clamp
65 ing seats upon the clamping members between
which a metallic conductor is adapted to be
clamped, and operating means to force the
clamping members together to grip a metallic
conductor between the clamping seats and grip
70 the grounding wire against the sides of the hinge
holes.
6. A grounding ?tting for a groundingwire
comprising clamping members, extension means
carried by one clamping member and extending
75 substantially at right angles to the general plane
in the extension means are adapted to receive a
wire to be grounded which wire serves as a hinge
pin between the clamping vmembers, clamping
seats upon the clamping members between which
a metallic conductor is adapted to be clamped,
reenforcing ?ange means extending from the
extension means as a continuation thereof over 10
the back of the clamping member, and operating
means to force the clamping members together
to grip a metallic conductor between the clamp
ing seats and grip the grounding wire against the
sides 0! the hinge holes.
15
7. A grounding ?tting for a grounding wire
comprising clamping members, extension means
carried by one clamping member and extending
substantially'at right angles to the general plane
thereof, a plurality of spaced hinge holes in the 20
extension means, a hinge hole in the other clamp—
ing member which hinge hole and one of those
in the extension means are adapted to receive a
wire to be grounded which wire serves as a hinge
pin between the clamping members, clamping
25
seats upon the clamping members between which
a metallic conductor is adapted to be clamped, ’
openings at the end of each clamping member, a
pair of ?anges extending from the extension
means over the back of the clamping member 30
and one ?ange passing on each side of the open
ing upon one clamping member, an operating
bolt passing through the openings to force the
clamping members together to grip a metallic
conductor between the clamping seats and grip 35
the grounding wireagainst the sides of the hinge
holes, and a head on the operating bolt received
between the ?anges to prevent the operating bolt
from turning.
8. A ‘grounding ?tting for a grounding wire 40
comprising clamping members, a hinge bearing
in each clamping member which hinge bearings
are adapted to receive a wire to be grounded
which wire serves as a pin to hingedly secure the
clamping members together, clamping seats upon 45
the clamping members between which a metallic
conductor is adapted to be:clamped, openings at
the end of each clamping member, a pair of
?anges extending over the back of one of the
clamping members and one ?ange passing on 60
each side of the opening in the end of the clamp
ing member, an operating bolt passing through
the openings to force the clamping members to
gether to grip a metallic conductor between the
clamping seats and grip the grounding wire 55
against‘ the sides of the hinge holes, and a head
on the operating bolt received between the
?anges to prevent the operating bolt from turn
ing.
-
9. A grounding ?tting for a grounding wire 60
comprising clamping members, a hinge bearing
in each clamping member which hinge bearings
are adapted to receive a wire to be grounded
which wire serves as a pin to hingedly secure
the clamping members together, clamping seats 65
upon the clamping members between which a
metallic conductor is adapted to be clamped, an
insertable clamping seat received over the clamp
ing seat carried by one of the clamping members,
and operating means to force the clamping mem 70
bers together to grip a metallic conductor be
tween the clamping seats and grip the grounding
wire against the hinge bearings.
10. A grounding-?tting for a grounding wire
comprising'clamping members, a hinge bearing
2,112,053
.
,
‘ in each clamping member which hinge bearings ings are adapted to receive a wire to be grounded
are adapted to receive a wire to be grounded: which wire serves as a pin to hingedly secure
which wire serves as a pin to hingedly secure ‘the twoclamping members together, clamping
the two clamping members together,_clamping
seats upon the clamping members formed with
angularly disposed surfaces between which seats
a metallic conductor is adapted to be clamped,
serrations upon the clamping seats, an insertable
clamping seat received over the clamping seat
seats upon the clamping members between which
a metallic conductor is adapted to be clamped, ta
serrations upon at least one seat, an insertable
clamping seat received over the clamping seat
carried by one of the clamping members, edges
carried by the insertable seat engaging in the i ‘
serrations, tabs carried by the insertable' clamp
edges thereof engaging the serrations upon the ing seat and bendable over the edge of the clamp
clamping seat to retain the insertable seat in ing member, the serrations and tabsanchoring
position, and-operating means to force the clamp- ' the insertable clamping seat ‘upon the clamping
member, and operating means to force the clamp
ing'members ‘together to grip a metallic con
ductor between the clamping seats arid grip the ing members together to grip a metallic con
ductor between the clamping seats and grip the
grounding wire against the hinge bearings. '
11. A grounding ?tting for a grounding wire grounding wire against the hinge bearings.
carried by one of the clamping members and the
' comprising two clamping members; a hinge bear;
ingv in each clamplngmember which hinge bear
GEORGE c. moms, JR.
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