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Патент USA US3097047

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July 9, 1963
e. R. GAINER ETAL
3,097,037‘
ROTATABLE HOT LINE CLAMPS
Filed May 6. 1960
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INVENTORS
00>’ 1?. mam/51?, ~51
(760806 '4BY
A40 4 40v
United States Patent 0 ”
C6
3,097,037
Patented July 9, 1963
1
2
3,097,037
12, comprises a main conductor clamp component 14,
and a secondary clamp component 16, which is rotatably
mounted on the main clamp component 14, for clamping
ROTATABLE HOT LINE CLAMPS
_
Guy R. Gainer, 3700 W. 16th St., and George A. McLam,
1214 Calhoun Ave., both of Panama City, Fla.
Filed May 6, 1960, Ser. No. 27,391
4 Claims. (Q1. 339-445)
a main conductor M and a second conductor S, respec
tively, these components and their parts being made of
suitable high-conductive metal.
The main conductor clamp component 14 comprises an
elongated straight ?at shank 18 on whose other side is a
This invention relates to novel \and improved hot line
reinforcing and lifting rod eye-carrying ?ange 20, which
clamps, wherein hot ‘line clamping components and con
ductor clamping components, for jumper Wires or ground 10 is centered on the ‘longitudinal centerline of the shank
chains, are rotatable relative to each other.
18, and has, at its upper end, a lateral eye 22.
On the
lower end of the shank 18 is a night-angular later-ally in
The primary object of the invention is the provision of
wardly extending arm 24 having a circular boss 26 on its
hot 'line cl-amps of the kind indicated, which are electri
cally and mechanically superior, are substantially arc
underside, to which is joined an end portion 28 of the
proof, and which greatly facilitate the work of and in 15 eye ?ange 20. A vertical threaded bore 30 extends
through the arm 24 and the boss 26, through which is
crease the safety of linemen, by eliminating the need for
bending, twisting, or otherwise over~stressing such as
threaded a clamping screw 32.
jumper wires and ground chains and other secondary
The clamping screw 32 has a turning loop or handle 34
?xed on its lower end, below the boss 26, and has a cir
cumferential tlocking groove 36 located near to and spaced
tated relative to each other into positions corresponding
from its ?at and squared upper end 38. A movable
with the positions of the main conductors or hot lines and
clamping jaw 40 is engaged over the upper end of the
the secondary conductors, where these are disposed in
screw 32, and comprises a solid rectangular block 42 hav
angular relation to each other.
Another object of the invention is to provide hot line
ing a depending collar 44 von its underside, which, with an
clamps of the character indicated above which assure 25 indentation 46 in the underside of the block 42, de?nes
a cylindrical downwardly opening socket ‘43, in which the
accurate and secure ?tting of the main line clamps on
upper end of the screw 32 is closely and rotatably en
main conductors, and which eliminate loosening and other
gaged, and in which it is held by suitable means, such as
undesirable strains and stresses ‘on the main line clamping
a pin 50 secured to the block 42 and extending across
components and the main Lines, otherwise produced by
one side of the socket 48 and engaged in the locking
spring-back of secondary conductors which have had to
groove 36.
be bent or twisted to ‘engage them in the secondary con
conductors, since components of the clamps can be ro
ductor clamping components.
The movable jaw block 42 has, in its top, a transversely
extending concavity 52 for engaging a side of a main con
A further object of the invention is the provision of hot
ductor M. The jaw 40‘ is guided on the shank 1%, and
line clamps of the character indicated above, which are
uncomplex in construction, the same being composed of 35 held against rotation relative thereto, by laterally spaced
a small number of simple and easily assembled parts,
vertical guide ?anges 54, on the laterally outward end
and being capable of being produced in rugged and well
56 of the block 42, which are slidably engaged with re
lated side edges of the shank 18, with the outer end 56
?nished forms at relatively low cost.
Other important objects and advantageous features of
of the block in sliding engagement with the laterally in
ward side 58‘ of the shank.
the invention will be apparent from the following descrip
tion and the accompanying drawings, wherein, for pur
Fixed on the upper end of, and positioned laterally
poses of illustration only, a speci?c form of the invention
inwardly of the shank 18, is a stationary jaw 69, which is
in the form of a vertically elongated solid rectangular
is set forth in detail:
In the drawings:
45 block 62, which has, at the side thereof remote from the
eye ?ange 20, a downwardly and laterally outwardly
FIGURE 1 is a side elevation of a hot line clamp of
curved main conductor guide tongue 64, having a convex
the present invention, showing main and secondary con
undersurface 66, for guiding a main conductor ‘between
ductors clamped therein;
the jaws 40 and 60.
FIGURE 2 is an edge elevation of said clamp, taken
The stationary jaw block 62 is formed with a down
from the right of FIGURE 1;
50
FIGURE 3 is a transverse vertical section taken on the
wardly opening axial socket which is aligned with the
line 3—3 of FIGURE 2;
FIGURE 4 is a top plan view of FIGURE 1, showing
rotated positions of the components ‘of the clamp, in full
clamping screw 32, and which is composed of a rela
and in phantom lines;
FIGURE 5 is a horizontal section taken on the line
tively large diameter lower portion 68, and a smaller
‘diameter upper portion 70, the lower end of the larger
55 lower portion 68 being ?ared, as indicated at 72. The
smaller upper socket portion 70 is closed at its upper end
by an integral top wall 74, through which is ‘formed an
axial bore 76, which is smaller in diameter than the upper
socket portion. A swivel stud 78 is engaged in the socket.
line clamp of the present invention, showing main ‘and
The swivel stud 7 8 comprises a cylindrical head 80 which
secondary conductors clamped therein;
60
is slightly smaller in diameter than the lower socket por
FIGURE 7 is an edge elevation of said clamp, taken
tion 68 and larger in diameter than the upper socket por
from the right of FIGURE 6;
5-5 of FIGURE 1;
FIGURE 6 is a side elevation of another form of hot
FIGURE 8 is a vertical transverse section taken on the
line 8—-8 of FIGURE 7;
tion 70, so that upward movement of the stud in the
socket is limited and stopped by engagement of the head
FIGURE 9‘ is a horizontal section taken on the line 65 80 with a shoulder 82 which is de?ned between the lower
9—9 of FIGURE 6; and,
FIGURE 10 is a horizontal section taken on the line
lit-A10 of FIGURE 8.
and upper portions of the socket. Centered on the upper
side of the head 80 is a reduced axial boss 84 which is of a
diameter to slide and rotate slowly in the upper socket
portion 70, without lost motion. Upstanding on the boss
Referring in detail to the drawings, in which Ilike and
related numerals designate like and related parts through 70 84 is a smooth stem 86, which is smaller in diameter than
the boss 84, and which extends slidably and rotatably and
out the several views, and ‘?rst to FIGURES 1 to 5, the
closely through the bore 76. The stem 86 has on its
hot line clamp therein shown, and generally designated
3,097,037
3
upper end, above the block 62, a threaded terminal 88.
Circumposed on the stem 86, within the upper socket
portion 76}, is a helical spring 9% which is compressed be
tween the top wall 74 and the boss 84-. The spring 90
4
and rotatably and slidably engaged, and the stem 86a has
a threaded terminal S8a on its upper end. The second
ary clamp component 16a comprises a vertically elon
gated downwardly ?aring orrfrusto-conical block 921,
serves to push the stud ‘73 downwardly against a main con
whose larger lower end 1623 is larger in diameter than the
ductor M engaged between the jaws 4t} and 6%, whenever
the movable jaw 40 is moved away from the stationary
jaw 69, so that constant and continuous electrical contact
?xed jaw 60*‘, and has opening thereto an upwardly
is maintained between the stud '78 and the main conductor
tapering axial annular recess 114. The height of the
block 928 makes up for the shortening of the ?xed jaw
60a, so that the secondary conductor clamping compo
M, such that arcing therebetween is precluded, which 10 nent 16a carries a secondary conductor S at substan
might damage the parts and subject a lineman to elec
tially the same height above the main conductor M, as is
trical shock.
provided for the clamp of FIGURES 1 to 5. An an
The secondary conductor component 16 of the instant
nular downwardly extending ?ange 116 on the lower end
hot line clamp is ?xedly mounted on the upper end of
of the block 921*, surrrounds and ‘is closely and slidably
the stem 86 of the stud 78. The component 16 comprises 15 enagaged with the ?xed jaw 60*’. The terminal 88a of
a solid rectangular and horizontally or transversely elon
the swivel stud stem 86‘1 is securably and non-rotatably
gated block 92, having a longitudinal bore 94 extending
engaged in a socket 110a provided in the upper end 118
therethrough to freely receive a secondary conductor S,
of the recess 114. A helical spring 9% is circumposed
and a set screw 96 is threaded through the top of the
on the stem 86% and is compressed between the upper
block 92 and into the bore 94- to clamp the conductor
end 118 of the recess 114 and the top 110“L of the ?xed
therein.
jaw 60“. A transverse secondary conductor accommo—
The bottom 98 of the block 92 and the top 100 of the
dating bore 94-a is provided in the upper part of the
stationary jaw block 62 are formed with axially aligned
block 922*, above recess 114, and a clamping set screw
bosses 102 and 104, respectively, which serve to vertically
96a is threaded into the upper end of the block 92a and
space the blocks 92 and 62 from each other. The fac 25 enters the bore 94*‘. The surrounding engagement of
ing ends of the bosses 102 and W4 are mating ?nished
the ?ange 116 with the upper part of the stationary jaw
surfaces 106 and 108, respectively, which are provided
66a prevents wobbling of the swivel pin 78”‘ when the
to make e?icient electrical contact with each other, when
main clamp component is not fastened to a main con
the clamping screw 32 is loosened enough to permit the
ductor, and ‘assures that when the main component is
spring 90 to expand and force the stud 78 downwardly 30 fastened to a main conductor, the secondary olarnp com
relative to the stationary jaw block 62, far enough to pro
duce engagement of the bosses 102 and 104 with each
other. This feature is provided to positively eliminate
ponent will be held stationary, the two components being
?xed together by the action of clamping the main con
ductor against the lower end of the swivel stud, so that
electrical arcing between the secondary clamp component
the three then serve as one conductor.
block ‘92 and the stationary jaw ‘block 62, in the situation 35
When the screw 32a is backed off, the spring 90a ex
outlined. Further, the ?nished and mating ends 106, 108
pands and forces the head 102 of the stud 78a into ?rm
provide for desirable, easy and relatively frictionless ro
contact with the stationary jaw 6441, so that ?rm and
tation of the components 14 and 16 relative to each other,
continuous electrical contact is obtained between the
even while the bosses 102, 104 are forcibly engaged with
swivel stud 80a and a main conductor M engaged be
40 tween the jaws 60*L and 40a, and the ?ange 116, which
each other.
The secondary clamp component block 92 is mounted
is normally out of electrical contact with the ?xed jaw
.on the stud 78, preferably by means of a threaded socket
60*‘, is engaged therewith so that arcing between the
(110 formed centrally in its underside, into which the
block 92a and the ?xed jaw 60 is eliminated, both in
threaded stud terminal 88 is threaded. In order to pro
loosening and tightening the clamp.
vide against rotation between the block 92 and the stud 45
While there have been shown and described herein
preferred forms of the invention, it is to be understood
that the invention is not necessarily con?ned thereto, and
that any change or changes in the structure of and in
the relative arrangements of components thereof are
contemplated as being within the scope of the invention
as de?ned by the claims appended hereto.
What is claimed is:
1. A hot line clamp comprising main conductor clamp
78, any suitable means can {be employed, such as swaging
the socket 110 around the stud stem 86.
‘It will be obvious from the foregoing that, with the
secondary conductors clamped in the conductor clamp
components 16 the main conductor clamp component 14
can be freely rotated, by a lineman, relative to the com
ponent 16, to whatever position or positions may be con
Ivenient or necessary for facilitating the work of clamp
ing a secondary conductor S, in an unbent and untwisted
ing component, having an elongated shank having upper
condition, to the main conductor M.
55 and lower ends and laterally inward and outward sides,
The form of the hot line clamp shown in FIGURES 6 to
a ?xed jaw on the shank at its upper end and extending
10, and generally designated 12"’, diifers from the form of
laterally inwardly from the shank, an arm on the shank
FIGURES 1 to 5, only in the construction and relative
at its lower end and extending laterally inwardly from
arrangement of its ?xed jaw60a, its swivel stud 78a, and
its secondary conductor clamp component 16*‘.
The stationary jaw 60a of the hot line clamp 12a is
‘vertically shortened, as compared to the stationary jaw
the shank, ‘a clamping screw threaded through said arm,
said screw having an upper end above said arm and a
lower end below said arm, means for rotating the screw
in opposite directions, a movable jaw rotatably connected
60, is disc-like in formation and has a convex top 1003,
on the upper end of the ‘screw in line with the ?xed jaw,
and'a transverse concavity 111 in its lower end. Instead
guide means on the movable jaw slidably engaged with
of being provided with a socket, the jaw 60a is formed 65 the shank, said ?xed jaw having upper and lower ends,
with a downwardly ?aring bore 112 which terminates at
vertical opening means extending through said ?xed jaw
1 its smaller upper end in a shallow bore 76%. A laterally
to its ends, shoulder means in said opening means spaced
outwardly and downwardly extending main conductor
above the lower end of the opening means, a swivel stud
guide lip 64a is provided on the side of the jaw 60a re
engaged upwardly through said opening means, said stud
mote from the shank 18a, and has a convex guide surface 70 comprising an enlarged head in said opening means 'be
66EL on its underside.
low and engageable, at times, with said shoulder means
The swivel stud 78*‘ has a downwardly ?aring head
and an upstanding smooth stem having an upper end
80*‘, Whose taper is somewhat less than that of the ?ared
extending above the upper end of the ?xed jaw, and a
bore 112, and its smooth stem 86‘?- extends upwardly
secondary conductor clamping component ?xedly and
through the shallow bore 7 6a, in which the stem is closely 75 non-rotatably mounted on the upper end of the stem,
3,097,037
5
6
and spring means engaged with the stud and biasing the
stud head toward the movable jaw, and being compres
means spaced above the lower end of the opening means,
a swivel stud engaged upwardly through said opening
means, said stud comprising an enlarged head in said open
ing means below and engageable, ‘at times, with said shoul
sible to space the secondary conductor clamping com
ponent upwardly out of contact with the ?xed jaw while
the main conductor is clamped between the movable jaw
and the ?xed jaw and the stud head is in electrical con
tact with such main conductor.
2. A hot line clamp comprising a main conductor
der means and an upstanding smooth stem having an
upper end extending above the upper end of the ?xed
jaw, and a secondary conductor clamping component ?x
edly and non-rotatably mounted on the upper end of the
clamping component, having an elongated shank having
stern, and spring means engaged with the stud and biasing
upper and lower ends and laterally inward and outward 10 the stud head toward the movable jaw, and being com
sides, a ?xed jaw on the shank at its upper end and ex
pressible to space the secondary conductor clamping com
tending laterally inwardly from the shank, an arm on
ponent upwardly out of contact with the ?xed jaw while
the shank at its lower end and extending laterally in
a main conductor is clamped between the movable jaw
wardly from the shank, a clamping screw threaded
and the ?xed jaw and the stud head is in. electrical con
through said arm, said screw having an upper end above 15 tact with such main conductor, said opening means com
said arm and a lower end below said arm, means for ro
prising a socket having a larger diameter lower portion
tating the screw in opposite directions, a movable jaw
opening to the lower end of the ?xed jaw and a smaller
rotatably connected on the upper end of the screw in
diameter upper portion closed at its upper end by a wall
line with the ?xed jaw, guide means on the movable
at the top of the ?xed jaw, said wall having an axial bore
jaw slidably engaged with the shank, said ?xed jaw hav
therethrough smaller in diameter than said upper socket
ing upper and lower ends, vertical opening means ex
portion, said stud head sliding in the larger lower socket
tending through said ?xed jaw to its ends, shoulder
portion, an upstanding boss on said head sl-idably and
means in said opening means spaced above the lower
rotatably ?tting said upper socket portion, and the stud
end of the opening means, a swivel stud engaged up
stem sliding through said bore, said spring means being
wardly through said opening means, said stud compris 25 a helical spring circumposed on the stem within said upper
ing an enlarged head in said opening means below and
socket portion and compressed between said top wall and
engageable, at times, with said shoulder means and an
said boss, said upper and lower socket portions ‘de?ning a
upstanding smooth stem having an upper end extending
shoulder therebetween with which the stud head is, at
above the upper end of the ?xed jaw, and a secondary
times, engageable, said secondary conductor clamping
conductor clamping ?xedly and non-rotatably mounted 30 component comprising a block having a transverse hori
on the upper end of the stem, and spring means engaged
zontal bore therethrough to receive a secondary conduc
with the stud and biasing the stud head toward the mov
tor, and means for clamping the secondary conductor
able jaw, and being compressible to space the secondary
therein, said ?xed jaw comprising a ‘block, facing reduced
conductor clamping component upwardly out of contact
diameter bosses on the secondary conductor clamping
with the ?xed jaw while a main conductor is clamped 35 block and the ?xed jaw block, said bosses being rotatably
between the movable jaw and the ?xed jaw and the stud
head is in electrical contact with such main conductor,
engaged and spacing the secondary conductor clamping
block above the ?xed jaw block.
said opening means comprising a socket having a larger
4. A hot line clamp comprising a shank having ?rst
diameter lower portion opening to the lower end of
and second ends, a lateral ?xed jaw on the shank at said
the ?xed jaw and a smaller diameter upper portion closed 40 ?rst end and ‘at one side of the shank, said ?xed jaw
having a socket opening to the end thereof adjacent to
at its upper end by a wall at the top of the ?xed jaw,
the second end of the shank, said socket having an end
said wall having an axial bore therethrough smaller in
wall provided with an opening, a stud having an enlarged
diameter than said upper socket portion, said stud head
head positioned in the socket and a stem extending slid
sliding in the larger lower socket portion, ‘an upstanding
boss on said head slidably and rotatably ?tting said upper 4:5 ably through said opening, stop means in said socket limit
socket portion, the stud stem extending slidably through
ing travel of the stud toward the ?rst end of the shank,
spring means compressed between the ?xed jaw ‘and the
said bore, said spring means being a helical spring cir
stud, a transverse secondary conductor clamp ?xed on the
cumposed on the stem within said upper socket portion
stem, the secondary ‘conductor clamp and the stud being
and compressed between said top wall and said boss,
said upper and lower socket portions de?ning a shoulder 50 rotatable relative to the ?xed jaw, said ?xed jaw having
an end facing the second end of the shank and formed
therebetween with which the stud head is, at times, en
with a ?ared transverse opening extending to opposite
gageable, said secondary component comprising a block
sides of the ?xed jaw, the adjacent end of the socket
having a transverse horizontal bore therethrough to re
opening to the ?ared opening, said head being exposed
ceive a secondary conductor, and means for clamping
55 within the ?ared opening, a movable jaw supportably
the secondary conductor therein.
engaged with the shank between the ?xed jaw and the
3. A hot line clamp comprising a main conductor
second end of the shank, and a clamping screw mounted
clamping component, having an elongated shank having
on the shank and connected to the movable jaw.
upper and lower ends and laterally inward and outward
sides, a ?xed jaw on the shank at its upper end and ex
tending laterally inwardly ‘from the shank, an arm on the 60
shank at its lower end and extending laterally inwardly
from the shank, a clamping screw threaded through said
References Cited in the ?le of this patent
UNITED STATES PATENTS
arm, said screw having an upper end above said arm and
a lower end below said arm, means 'for rotating the
369,143
1,793,911
Wihite ______________ __ Aug. 30, 1887
iDann _______________ __ Feb. 24, 1931
connected on the upper end of the screw in line with the
2,038,436
2,287,762
2,448,402
IMangin _____________ __ Apr. 21, 1936
Rogo?” ______________ __ June 23, 1942
Thompson __________ __ Aug. 31, 194-8
986,220
France ______________ __ Mar. 21, 1951
screw in opposite directions, a movable jaw rotatably 65
?xed jaw, guide means on the movable jaw slidably en
gaged with the shank, said ?xed jaw having upper and
lower ends, vertical opening means extending through said
?xed jaw to its ends, shoulder means in said opening 70
FOREIGN PATENTS
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