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Патент USA US2114940

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H. H. R u D D
ELECTR I QAL CONNECTER
Filed Oct. 14, 1936
2,114,940
Patented
2,114,940
pr. 19, 1938
‘l’
s
2,114,940
ELEQTIRIICAL CONNECTER
Harold iii. Rudd, Greensburg, Pa, assignor, by
mesne assignments, to Railway and industrial
Engineering Company, Greensburg, li’a., a cor
poration of Delaware
Application October 14!, 1936, Serial No. 105,578
10 Claims. (Cl. 173-273)
This invention relates to electrical connecters, tively, for receiving line conductors of different
and more particularly to connecters of the type
commonly known as live line clamps.
Live line clamps may be used for connecting
El any two wires or conductors but are especially
useful for connecting a tap line or branch to a
live line or conductor without cutting the latter
or otherwise interfering with current ?ow
through the same.
An object of this invention is to provide a live
line clamp of a simple construction which re
duces the machining and threading of the parts
to a minimum. An object is to provide a live
line clamp of the rocker arm type in which the
15 rocker arm is pivotally supported upon the base
member by a link that may be somewhat resilient
under the normal clamping stresses, thus insur
ing a firm clamping action over a comparatively
wide range of adjustment of the clamp bolt. An
object is to provide a live line clamp of the type
20 including a pivotally supported rocker or clamp
arm, and in which the rocker arm rests upon and
is held to a bearing seat by a pivot loop or link.
These and other objects and advantages of the
invention will be apparent from the following
sizes.
The link is seated on the base i in a recess be
tween the sleeve 2 and an integral lug i0, and the
link is pivotally connected to the arm 6 by the
bent end of a malleable lug H. The plane of the
link 9 passes approximately through the axis of
speci?cation when taken with the accompanying
3
drawing, in which:
Fig. l is a perspective view of one embodiment
of the invention; and
Fig. 2 is a side elevation of the same, in place
on the live line and carrying a tap line.
In the drawing, the reference numeral I identi
?es the rugged upper end portion of the base
member which is preferably formed as a casting
of malleable bronze or other metal of good ther
35
mal and electrical conductivity. The base mem
ber terminates in a sleeve 2 into which the clamp
bolt 3 is threaded, the upper end of the bolt
threads being preferably burred, as indicated at
40 3', to prevent the accidental removal of the'bolt
from the sleeve 2, and the lower end of the bolt
being formed as a ring It for receiving the head
of the customary fuse-hook of a switch stick.
The upper surface of the base member I has a
45 transversely extending semi-cylindrical rib 5 that
fits within a complementary groove at the central
portion of the rocker arm 6 to form a bearing
seat for the rocker arm.
The outer end to of the ,
rocker arm overlies the sleeve 2 for engagement
by the clamp bolt 3, and the tail 6b of the rocker
arm ?ares away from the strap 1 to form a guide
for placing the clamp on a live line L. The op—
posed surfaces of the arm 6 and base I have sets
55 of complementary clamp surfaces 8, 8', respec
‘
A pivot loop or link 9 extends around the mem
ber i and arm 8 to take up the reaction of the
clamping pressures when the clamp is in use.
the bearing seat 5, but the ?oating connection of
the parts permits the link to move angularly in
accordance with the size of the line conductor
and the clamping pressures. The link Q is rela
tively short and retains the rocker arm on the 15
bearing seat 5 when the bolt 3 is backed ed.
The strap ‘l merges into a boss it that has a
non-circular, and preferably square, bore for re
ceiving the non-circular and'transversely aper
tured head end it of a bolt that is clamped to the
tap line T by a nut M. The extension l5 of the
0
strap beyond the boss if! has lateral projections
it that may be bent around the tap line T to hold
the anchored end of that conductor in line with
the terminal strap. - The parts of the clamp may 25
be cast in metal molds to provide smooth surfaces
for the bearing seat 5 and cooperating surface of
the rocker arm, or the parts may be rough cast
and machined or coin-pressed at the bearing and
the line clamping surfaces. The relatively long
bearing seat 5 and the guide action of the opposite
sides of the link 9 limit the twisting of the rocker
arm on the base member but provide sufficient
play for a‘ self-alignment of the clamp parts upon
a conductor when the grooves 8, B’ are not ex
actly parallel to each other or to the e?iective piv
otal axis of the rocker arm.
The link 9 is somewhat resilient under the
pressures usually employed in securing the
clamps to a line, and the clamp bolt 3 can there 40
fore be rotated after a relatively firm clamping
engagement with the line L is obtained. This re
siliency of the link 9 is highly desirable as it
tends to eliminate the faulty connections that are
produced with other forms of live line clamps by
slight backing off of the bolt 3 when the operating
hook is being removed from the ring 4. There is
a relatively wide range of adjustment of the
clamp bolt 3 throughout which adequate clamp
ing pressure is produced at the line L and the
clamp will not loosen on the line under tempera
ture changes and vibration when it is initially ap
plied under something more than the minimum
pressure that will give a firm clamping action.
While I have described a preferred method of 55
2
2,114,940
assembling the clamp by bending the lug H about
the link 9, it will be apparent that a split link
blank may be‘ used, or an elongated link may be
slipped over the parts and then pressed to ex
pand it laterally and shorten its effective length.
The term “substantially closed link”, as used in
the following claims, designates a member of the
general form ofan oval chain link whether the
ends of the link blank are welded to form a com
pletely closed link or are adjacent each other but
not welded together.
It is to be understood that there is considerable
latitude in the design and relative proportions of
the parts, and that many changes may be made
16 in the illustrated embodiment without departing
from the spirit of my invention as set forth in
the following claims.
I claim:
1. A live line clamp of the type including a base
20 member, a rocker arm, a bolt carried by said
base member and engaging one end of the rocker
arm to force the opposite end towards said base
member, and fulcrum means forming a pivot for
said rocker arm when said bolt exerts clamping
pressure upon one end thereof, characterized by
the fact that said fulcrum means comprises a
substantially closed link.
2. A live line clamp comprising a base member,
means for connecting a tap line to said base
30 member, a rocker member, means mounting the
rocker member on said base member for pivotal
movement of the rocker arm about its central
portion, and means for forcing one end of said
rocker member away from said base member to
35 carry the opposite end into clamping engagement
with a line conductor positioned between said
accidental separation of said members from each
other and from said link.
5. A live line clamp comprising a base member
having means for connecting a tap line thereto,
a rib at the upper surface of the bearing member,
a rocker member having a groove complemental
to and seated on said rib, a substantially closed
link pivotally connecting said members for rock
ing movement of said rocker member'substan
tially about said rib, a threaded sleeve integral 10
with said base member beneath one end of the
rocker member, a clamp bolt threaded through
said sleeve, and cooperating clamp surfaces at
the other end of said rocker member and the ad~
jacent face of the base member.
15
6. A live line clamp comprising a base mem
ber of malleable metal having an integral sleeve
and an integral terminal strap extending from
opposite sides thereof, a clamp bolt threaded
through said sleeve, a rocker member overlying 20
said base member and having one end ?aring
away from said terminal strap, the other end of
said rocker member being in line with said clamp
bolt, cooperating clamp surfaces on said mem
bers at the terminal strap side of said base mem 25
ber, a substantially closed link pivotally connect
ing said members, means on said terminal strap
for connection to a tap line, and malleable lugs
integral with said terminal strap for bending
around a tap line.
30
7. A live line clamp as claimed in claim 6,
wherein said link extends around said members,
and each member includes means preventing sep
rocker member and base member, said mounting
aration of said members from said link.
8. A live line clamp as claimed in claim 6, 85
wherein said link extends around said members,
and said rocker member has an integral lug bent
means comprising a substantially closed link
over said link.
forming a fulcrum for said rocker arm when the
40 latter clamps a line conductor to the base mem
her.
3. A live line clamp comprising a base mem
ber, means for connecting a tap line to said base
45 member, a rocker member, means pivotally
mounting the rocker member on said base mem
ber, and means for forcing one end of said rocker
member into clamping engagement with a line
conductor positioned between said rocker mem
50 ber and base member, said mounting means com
prising a substantially closed link extending
around said members and constituting a pivotal
support for said rocker arm.
4. A live line clamp as claimed in claim 3,
55 wherein one of said members is malleable and has
an integral lug bent around said link to prevent
9. A live line clamp comprising a base member
having an integral sleeve and an integral ter 40
minal strap, means on said strap for making con
nection to a tap line, a bolt threaded through said
sleeve, a rocker member overlying said base mem
ber, clamp surfaces on said members for engage
ment with a line conductor when said bolt is 45
forced against said rocker member, and a re
silient substantially closed link pivotally con
necting said members.
10. A live line clamp as claimed in claim 9,
wherein said link is seated against the bottom 50
of said base member between said bolt and a pro
jection on said base member, and said link ex~
tends over said rocker member and is secured
thereto by an integral lug on said rocker member,
said lug being bent over said link.
HAROLD H. RUDD.
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