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Патент USA US2135360

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NOV. 1, 1938.
Filed Feb. ' 20, 1955
fohnI Kay/or .
Patented Nov. 1, 1938
John J. Taylor, Wadsworth, Ohio, assignor to The
Ohio Brass Company, Mans?eld, Ohio, a cor
poration of New Jersey
Application February 20, 1936, Serial No. 64,859
7 Claims. (Cl. 173-313)
This invention relates to conductor clamps for E5 is large enough to permit slight pivotal move
insulators of the post or pin type, and has for one
of its objects the provision of a simple and effec
tive clamp for securing a conductor on top of an
insulator and one which will be more effective
than the tie wire heretofore used for this pur
A further object of the invention is to provide a
conductor holder for a pin type insulator which
10 will not produce radio disturbances.
A further object of the invention is to provide a
pivoted clamp that can be mounted on the top of
an insulator and that will hold the conductor
?rmly against movement in the direction of its
15 axis but will yield to vertical vibrations of the
conductor so as to avoid bending at the clamp.
-A further object of the invention is to provide
a device of the class named which shall be of
ment upon the upper element of the pintle 85
without relative sliding of the bearing surfaces.
This, as will be seen from Fig. 3, locates the axis of
the pivotal movement substantially in horizontal
alignment with the longitudinal axis of the cable
in the conductor seat. This pivotal movement
will not tend to shift the cable in a longitudinal
direction and will produce less bearing pressure
at the end of the cable seat than would be the 10
case if the axis of pivotal movement were either
above or below the longitudinal axis of the cable.
If the axis of the cable were above the piv
otal axis of the cradle iii, any longitudinal stress
on the cable would produce a moment tending to 15
rotate the cradle upon its axis, due to the lever
arm between the axis of the cable and the pivotal
axis of the seat.
This would cause one end of the
improved construction and operation.
Other objects and advantages will appear from
the following description.
The invention is exempli?ed by the combination and arrangement of parts shown in the
accompanying drawing and described in the fol25 lowing speci?cation, and it is more particularly
pointed out in the appended claims.
In the drawing:
Fig. 1 is an elevation with parts in section
seat to press against the cable, forming a node
for the cable vibrations, and an initial stress 20
tending to aggravate fatigue at the node pro
duced by the pressure of the end of the cable
Seat against the cable. Furthermore the moment
of the seat pressing one end against the cable
would hold the seat locked against free movement 25
upon its pivot, thus neutralizing the bene?ts of
the pivotal mounting, insofar as it relieves the
e?ects of vibration. With the construction
showing one embodiment of the present invention,
Fig. 2 is a top plan-view, partly in section,
shown, however, any unbalanced longitudinal
stress on the cable willbe exerted directly in line
0f the device shown in Fig. 1.
with the pivotal axis of the seat and hence will
Fig. 3 is half elevation and half section of the produce no rotating moment of the seat.
clamp shown in Figs. 1 and 2.
If the pintles were ?xed to the cradle and rested
The numeral l0 designates any insulator of in bearings in the supporting ears, the pivotal ro
the post _or pin type having a recess in its upper tation would be about the lowest element of the
end in which an insert H is secured by cement pintle rather than the top element, and it would
I2. The insert H carries a clamp base 13 hav- be necessary to raise the pintle an amount equal
ing upwardly projecting ears ill on which are to its own diameter as compared with the ar
mounted a pair of inwardly extending axially rangement of Fig. 3, in Order to bring the piv
aligned pintles l5, one on each of the ears I4. otal axis in alignment with the longitudinal axis
An elongated conductor seat or cradle I6 is pm- of the cable. This, of course, would increase-the
vided with a pair of laterally extending bosses l1, Effective length of the insert above its DOint of
each of which is provided with a downwardly embedment in the insulator and thus add to the
opening pocket £8 for receiving a pintle l5. The bending moment of the force exerted by the con
upper end of each pocket [8 is closed by a bridge ductor on the insulator. By connecting the
bar l9 which rests on the pintle l5 and supports ‘ pintles t0 the Support rather than to the Cradle,
the cradle I6. It will be seen that because the
the cantilever action on the insulator is decreased
pockets I8 are open at their lower ends, the because of this difference in lever arm length.
cradle l6 may be readily set down over the pintles
Although the table Support rests by gravity
l5 and will be pivotally supported by engagement upon its pintles, it sometimes happens that the
between the pintles l5 and their cooperating bear- contour of the conductor line is such that there is
ing bridges 19. The conductor seat or cradle IS an uplift on the conductor, which would tend to
will rest in place by gravity and has pivotal raise the cradle off of its supporting insulator.
movement about the line of contact ,at the top of To avoid any possibility of accidental displace
the pintle l5. The bearing pocket of the pintle ment, the bolts which hold the keeper on the
conductor are made to serve the additional func
tion of locking the cable seat in place. These
bolts are designated by the numeral 20 and ex
tend up through the pockets i8 just inside the
ends of the pintles i5. The lower ends of the
bolt shanks are squared to ?t the pockets i8 so
as to hold the bolts against rotation and each‘
bolt is provided with a head 2i which engages the
cradle it at the lower end of the pocket i8.
ri‘he outer edge of the bolt head 2!, as will be
seen from Fig. 8, bridges the portion of the pocket
into which the pintle i5 projects, thus locking the
pintle in the pocket and preventing accidental
displacement of the cradle from its bearing. It
will also be noted that the outer square face of
the bolt shanlr engages the inner ends of the pivot
so as to prevent transverse movement
of the cradle. Any lateral force on the conductor
will be counteracted by pressure on the ends of
the pintles it which will withstand the force with
out producing any serious friction to interfere
with the pivotal movement of the cradle.
The upper ends of the bolts 20 engage a keeper
22 by means of which the cable is clamped in the
seat i6. The keeper 22 is provided with two bear
ing faces 23 and 24 having diiferent radii of our
vature and being offset vertically different dis
tances relative to the ends of the keeper. By
this arrangement, cables of a large range of di
ameters may be clamped in the conductor seat.
Nuts 26 and lock washers 25 are provided for
holding the keeper piece in place.
In attaching a conductor to an insulator by
means of the device described, the bolt heads 2|
are ?rst located beneath the pintles i5 and then
the cradle i6 is lowered into place with the bolts
projecting through the pocket openings.
conductor is then located in the seat and the
clamp 22 placed over the ends of the bolts with
the bearing seat, which best ?ts the particular
cable, turned downwardly. ,The nuts are then
tightened up to secure the conductor in place. By
this arrangement, a simple means is provided for
securing all the advantages of the pivoted clamp
for a conductor mounted on a pin type insulator.
The insert ii not only ?rmly holds the clamping
means in place but also acts as an insulated ?ux
control for screening the exposed parts of the fit
ting and preventing corona from any exposed
portion of the ?tting. The lower end of the in
sert ii is, of course, closer to the ground connec
tion than any other part of the ?tting‘so that
the electrostatic ?ux will tend to emanate from
the part of the ?tting covered by the insulation
l0 rather than from any exposed point; and since
the end of the ?tting II is in direct electrical
connection with the surface of the porcelain l0
through the interposed cement, the formation of
corona at this point is entirely avoided.
The form of pivotal mounting makes it pos
sible to locate the cable very close to the top of
the insulator so as to avoid greatly increasing
the cantilever action. The pivotal mounting per
mits vertical movement of the conductor support
at the point where the conductor leaves-the sup
port so as to avoid fatigue of the conductor
strands by bending at this point. At the same
time, the clamp provides a permanent grip on
the conductor which holds the conductor against
70 slipping relative to the insulator, and thus main»
tains the proper division of the catenary sag be
tween the various conductor supports.
The device is particularly convenient for what
is commonly referred to as “hot line” operations,
that is, operations with the conductor energized.
The only equipment that is required is an in
sulated wrench for loosening the nuts 26, since
the same nuts serve to clamp the cable and to
lock the conductor support to the insulator. By
loosening the nuts 26, the clamp is unlocked from Cl
the supporting pinions and loosened on the cable
so that it may be slid along the cable out of the
way without completely separating the parts of
the clamp. This will permit replacement of a de
fective insulator or other desired operation after
which the clamp may be slid into position on the
newly installed support and the nuts re-tightened.
Simply loosening the nuts is very easily eifected
on a “hot line”, but where it is necessary to re
move and replace the parts of the clamp, the
operation is much more di?lcult.
I claim:
1. An insulator of the pin or post type having
a recess in the top thereof, a metal support hav
ing a projection cemented in said recess, a hear
ing pintle carried by said support, and a conductor
clamp having a bearing opening therein and en
gaging said pintle and resting thereon for piv
otally supporting a conductor on said pintle said
clamp having pivotal movement about the top
element of said pintle and having a transversely
curved cable seat, the longitudinal axis of said
seat extending transversely to the pivotal axis of
said seat on said pintle, the bottom of said seat
being spaced below the level of said element a.
distance approximately equal to the radius of our
vature of said seat.
2. In combination, a support having a pair of
pivot studs in axial alignment thereon, a cradle
for a conductor, said cradle having pockets en- .
gaging said studs, a keeper for holding the con
ductor in said cradle, and means for locking said
pivot studs in said pockets having locking means
also holding said keeper in engagement with a
conductor in said cradle.
3. A conductor support comprising a cradle, a
pivot stud for supporting said cradle, said cradle
having a pocket therein for receiving said stud,
a keeper for holding a conductor in said cradle,
and a bolt for holding said keeper on said cradle
and for locking said pivot stud in said pocket.
4. A conductor support comprising a dielectric
member having a recess in the top thereof, a
metal ?tting mounted on said dielectric member
and having a projection thereon cemented in said
recess, said ?tting having upwardly projecting
spaced ears, inwardly extending pivot studs
mounted on said ears in axial alignment with
each other, a. cradle having downwardly opening
pockets in the opposite sides thereof for engag 55
ing said pivot studs, a keeper for holding a con
ductor in said cradle, and bolts for holding said
keeper on said cradle, the heads of said bolts be
ing disposed across the lower ends of said pockets
for locking said pivot studs in said pockets.
5. A conductor support comprising a dielec
tric member, a ?tting mounted on said member
and having inwardly extending pivot studs, a
cradle having pockets in opposite sides thereof for
receiving said studs, a keeper for securing a con
ductor in said cradle, and a pair of bolts for bold
ing said keeper on said cradle, the heads of said
bolts being arranged to close said pockets to lock
said pivot studs in said pockets, the ends of said
studs being arranged to engage said bolts to limit
movement of said cradle in the direction of the
axis of said studs.
6. A conductor support comprising a. pivotal
mounting, a clamp pivotally supported on said
mounting and common locking means for secur 78
ing said clamp to a conductor and for locking said
clamp on said mounting, said locking means being
releasable to permit displacement of said clamp
relative to said conductor and to said mounting
without completely disassembling said clamp.
7. In combination a clamp for holding a con
ductor, a pivotal support for said clamp and a
common bolt and nut for holding said clamp in
engagement with said conductor and for locking
said clamp on said pivotal support, said nut being
releasable to permit displacement of said clamp
relative to said conductor and to said support
without completely removing said nut from said 5
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