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Патент USA US2109733

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March 1', 1938.
R. R. PITTMAN ET AL
2,109,733
ELECTRICAL PROTECTIVE DEVICE
Filed April 26, 193'?
17159-1
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INVENTORS
2,109,133.
retested Mar. 1, 193;
‘ -, UNITED ‘STATES PATENT OFFICE
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2,109,733
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i'iaiphia Pittman and Carroll-H. Walsh,
Pine Blui!, Ark.
1
application April as, 1937, Serial No. 138,898
'IClalllll (oi. zoo-11s)
This invention relates to protective devices for
use in ‘connection with high voltage circuits, and
the principal object is to provide in a compact
unit a lightning arrester of the expulsion type
5 having a path‘ to ground for reducing excessive
' superimposed voltages, and a fuse of the expul
sion type for disconnecting a circuit in the event
fuse II, through which the fuse‘link 32 passes,
electrically connects the load terminal member 34
- a with the metal sleet hood IS.
The metal base I0 is electrically connected to "
ground, here schematically indicated by the nu- 5
meral 28, through the ground conductors?land
vthe ground terminal It. >
Y
The metal line terminal member 2! is attached
Another object is to provide a unitary assembly ‘to the upper surface of the sleet hood I! by
means of the screws 22 and‘ 23, and extends ver- 10
in which either the expulsion arrester or the ex
pulsion fuse, or both, may be readily removed for tically upward beyond the uppermost portion of
the upper insulator I6. The line terminal 24, at
inspection, repair or replacement.
the upper end of the terminal member 2!, is ar
A further object is to provide a device, embody
ing a removably mounted expulsion arrester and _ ranged to electrically connect the line conductor
a removably mounted expulsion fuse, in which 35. The horizontally positioned electrode 25 is 15 I
of excwsive overcurrent therein.
'
the gases attending the operation of both expul
' ' also rigidly attached to the upper end of the line
‘terminal member 21 by the pin 42, the latter ex
tending through both members.
A portion of the base 10 extends vertically to a
normally alive parts, and in divergent directions
point above the upperinsulator l0, and from its 20
with respect to each other.
with these and other objects ‘in view which will upper‘end a centrally positioned slot ll (Figs. 2
and vii) extends downwardly to a point in approxi
appear from the description, our invention re
sides in the construction and arrangement of mate coaxial alignment with the electrode 2!.
parts making up the combination which may be The mounting stud 80 of the expulsion type
sion devices will be discharged in a direction away
. from an operator of the device, away from the
so
lightning arrester "is positioned at the bottom 25 '
25 installed and removed as a unit,.and in which the of the slot ll , and is detachably mounted on the
number of parts is not only fewer than those re- ,
, quired for separately mounted units, but also in . base it by clamping the latter between the base ,
which the vital members which are subject to
21 of the arresterand the screw eye 20, the latter,
The
arrester may be readily removed by inserting the 30'
end of an insulated switch hook stick through
the eye 29, and rotating it in a counterclockwise
electrical damage are readily removable and re- - cooperating with threads on the stud Ill.
.30
placeable.
.
‘In the drawing, Fig. 1 is a side elevational view
of the device in the service position; Fig. 2 is a
fragmentary view of the upper end of the base,
direction until it is loosened, and then lifting it‘»
o? of the base ll. ‘
_ taken 'along the line lI-p-II in Fig. ,1; and Fig.3
A ‘suitable type of expulsion lightning arrester a
35 is a rear fragmentary view of the upper end of :_
' the base.
,
Referring first to Fig. 1, a base I. of conducting
material, here indicated as a metal channel, is
secured, by means of the attaching bolts and nuts
40
for use with the presentinvention is that shown
in detail in Patent No. 2,002,042, dated May 21,
- 1935, and issued to Ralph R. Pittman, one of the
inventors herein, and a suitable type of expulsion
12 and i3, and the metal strap H, to the wood ' fuse for use in the present invention is that shownv 4° _
cross arm II, with its-mounting surface 30 there ,in detail in our copending application Serial No.
against, the base extending vertically above and 120,962, died January 16, 1987.
Such devices as these, which depend upon the
below the cross arm ll.
>
expulsion principle for-arc extinguishment, disThe vertically spaced upper and lower insula
charge conducting gas and ?ame when operattors
II
and
'II
respectively
'are
rigidly
secured
to.
45
the base in any suitable manner. - The forwardly ing. Upon the solution to the problem of ‘direct
‘extending metal sleet hood ‘ll is secured to the ing such gases to avoid short circuits and injury
outer end of the upper insulator II by means of _ to. workmen depends ‘the success of devices of the
a
1 the cap screws 20, and similarly, the lower metal nature of the present invention.
For this reason, theexpulsion arrester _I‘I'.is
expulsion fuse support 84 is secured to the outer
,
‘as
'
so
end of thelower insulator I I by means of the cap ‘ providedwith the gas conducting and directing
sc'rew ll.
3
. _,
i
'
’_A load conductor 2.. is electrically connected to
the lower expulsion fuse support 3,4 by the load
terminal I2, and a swingably removable expulsion
vent 2|, integral with the’base 21, for discharg
ingthegasesinadirectionawayfromtheline_
termln?member 2|, and fromthe leakage pre-l ,
venting air gap formed by the spaced electrodes gs '
2,109,7aa
'
26 and 25. It may be also observed that this
direction of discharge is'away from the position
upper and lower insulators mounted on said base,
line and load terminals carried respectively by
of a workman operating the expulsion fuse 3i,
and divergent with respect to gases discharged
from the lower end of the expulsion fuse.
It will be apparent from the above description
that either or both the expulsion arrester I'I
and/or the expulsion fuse 3! may be readily
ing an expulsion fuse electrically connecting said
terminals, an expulsion lightning arrester posi
tioned adjacent said upper insulator in spaced
relationship with respect to said line terminal,
removed whenever desired with the use of an
ing downwardly from the top thereof for remov
ably attaching said expulsion arrester to said 10
10 ordinary switch hook.
From thelembodiment of our invention herein
speci?cally described, other equivalent arrange
ments will be apparent, and it is to be under
stood that the invention herein is to be limited
15 only as is necessitated by the prior art and the
appended claims.
What we claim is new, and desire to secure by
Letters Patent, is:
.
-
1. In combination, a base having a mounting
20 surface, and an expulsion fuse and an expulsion
arrester carried thereby, said expulsion fuse and
expulsion arrester being so positioned that the
gases attending their operation is discharged
through the plane in which said mounting sur
face lies and divergently with respect to each
other.
said upper and lower insulators, means includ
and means including a slot in said base extend
base.v
5. A protective device comprising a vertically
extending base of conducting material, spaced
upper and lower insulators mounted on said base,
line and load terminals carried respectively by 15
said upper and lower insulators, means includ
ing an expulsion fuse electrically connecting said
terminals, an expulsion lightning arrester posi
tioned adjacent said upper insulator in spaced
relationship with respect to said line terminal, 20
a slot in said base extending downwardly from
the top thereof, and adjustable means cooper
‘ating with said slot for removably attaching said
arrester to said base.
6. A protective device comprising a vertically 26
extending base of conducting material, spaced
2-. In combination, a base having a mounting _ upper and lower insulators mounted on said base,
surface, and an expulsion fuse and an expulsion
line and load terminals carried respectively by
lightning arrester removably mounted thereon,
said upper and lower insulators, means including
said expulsion fuse and expulsion arrester being
an expulsion fuse electrically connecting said ter 30
minals, an expulsion lightning arrester positioned
adjacent said upper insulator and in spaced rela
divergent with respect to the direction of dis
tionship with said line terminal, a slot in said
charge of gases attending the operation of the base extending downwardly from the top there
arrester, and so that the direction ofv gas dis
of, and adjustable means cooperating with said 35
charge from each is through the plane in which . slot for detachably supporting said arrester on
said mounting surface is positioned.
'
,said base, said arrester being so positioned that
3. A protective device. comprising a base of ‘the gaseous discharge accompanying its opera
conducting material, upper and lower insulators tion is directed away from both said line and load
40 gnounted in spaced relation on said base, a sleet terminals.
4
40
hood of conducting material secured to said upper
'7. In a protective device, the combination of
insulator and extending outwardly therefrom, a a common vertically extending metal base hav
line terminal member extending upwardly from ing mounted thereon spaced insulated upper line
said sleet hood, a line terminal secured at the ‘and lower. load terminal'members, a removable
upperend of said terminal member, a load ter
fuse container pivotally mounted on the load 45
minal associated with the lower insulator, means terminal member and in electrical contact with
including an expulsion fuse electrically connect
the line terminal member, means including an
arranged so that the gases attending the opera
tion of the fuse are discharged in a direction
ing the line terminal to the load terminal, and an
expulsion lightning arrester detachably mounted
50 on and electrically connected to said base above
the upper insulator and extending horizontally
therefrom to provide an air gap between said
arrester and said line terminal, said arrester
having vent means for directing the discharge of
55
gases attending the operation thereof through
the plane in which said base is positioned.
4. A protective device comprising a vertically
extending base of- conducting material, spaced
expulsion lightning arrester extending horizon
tally from the top of said base in normally insu
lated spaced relationship to upper line terminal 50
member for establishing a preferential spark
over path from ‘the latter to the base, and clamp
ing means combined with said arrester, said
clamping means being arranged to removably
engage said base for supporting said arrester
thereon.
RALPH R. PITTMAN.
CARROLL H. ‘WALSH.
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