US2109733A

US2109733A - Electrical protective device

Info

Publication number: US2109733A
Application number: US138896A
Authority: US
Inventors: Ralph R Pittman; Carroll H Walsh
Original assignee: Individual
Current assignee: Individual
Priority date: 1937-04-26
Filing date: 1937-04-26
Publication date: 1938-03-01
Anticipated expiration: 1955-03-01

Description

March 1938. R. R. PITTMAN ET AL 2,

ELECTRICAL PROTECTIVE DEVICE Filed April 26, 193'? 23. ,mmm

f 23% 4 INVENTORS retested Mar. 1, 193;

UNITED STATES PATENT OFFICE Carroll-H. Walsh, Ark.

application April as, 1937, Serial No. 138,898

(oi. zoo-11s) 'IClalllll- 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 having a path to ground for reducing excessive superimposed voltages, and a fuse of the expulsion type for disconnecting a circuit in the event of excwsive overcurrent therein.

Another object is to provide a unitary assembly in which either the expulsion arrester or the expulsion fuse, or both, may be readily removed for inspection, repair or replacement.

A further object is to provide a device, embodyfuse II, through which the fuselink 32 passes, electrically connects the load terminal member 34 a with the metal sleet hood IS.

the ground terminal It. Y

The metal line terminal member 2! is attached to the upper surface of the sleet hood I! by ing a removably mounted expulsion arrester and a removably mounted expulsion fuse, in which the gases attending the operation of both expulsion devices will be discharged in a direction away from an operator of the device, away from the normally alive parts, and in divergent directions with respect to each other.

with these and other objects in view which will appear from the description, our invention resides in the construction and arrangement of parts making up the combination which may be installed and removed as a unit,.and in which the means of the

screws

22 and 23, and extends ver- 10 tically upward beyond the uppermost portion of the upper insulator I6. The line terminal 24, at the upper end of the terminal member 2!, is arranged to electrically connect the line conductor 35.

' also rigidly attached to the upper end of the line terminal member 21 by the pin 42, the latter exnumber of parts is not only fewer than those required for separately mounted units, but also in which the vital members which are subject to electrical damage are readily removable and replaceable.

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,

taken 'along the line lI- -II in Fig. 1; and Fig.3 35 is a rear fragmentarythe 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 12 and i3, and the metal strap H, to the wood cross arm II, with its-mounting surface 30 thereagainst, the base extending vertically above and below the cross arm ll.

The vertically spaced upper and lower insulathe base in any suitable manner. The forwardly extending metal sleet hood ll is secured to the outer end of the upper insulator II by means of 1 the cap screws 20, and similarly, the lower metal expulsion fuse support 84 is secured to the outer end of thelower insulator I I by means of the cap 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 view of the upper end of tending through both members.

A portion of the base 10 extends vertically to a point above the upperinsulator l0, and from its 20 upperend a centrally positioned slot ll (Figs. 2 and ii) extends downwardly to a point in approximate coaxial alignment with the electrode 2!. The mounting stud of the expulsion type lightning arrester "is positioned at the bottom 25 of the slot ll and is detachably mounted on the base it by clamping the latter between the base 21 of the arresterand the screw eye 20, the latter, cooperating with threads on the stud Ill. The

arrester may be readily removed by inserting the end of an insulated switch hook stick through the eye 29, and rotating it in a counterclockwise direction until it is loosened, and then lifting it ofl of the base ll.

A suitable type of expulsion lightning arrester a 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 in detail in our copending application Serial No.

tors II and 'II respectively 'are rigidly secured to.

120,962, died January 16, 1987.

Such devices as these, which depend upon the expulsion principle for-arc extinguishment, discharge conducting gas and flame when operatas ing. Upon the solution to the problem of directing such gases to avoid short circuits and injury to. workmen depends the success of devices of the nature of the present invention. a

For this reason, theexpulsion arrester II'.is so providedwith the gas conducting and directing vent 2|, integral with thebase 21, for dischargingthegasesinadirectionawayfromtheline termlnflmember 2|, and fromthe leakage pre-l venting air gap formed by the spaced electrodes gs The horizontally positioned electrode 25 is 15 I 26 and 25. It may be also observed that this direction of discharge is'away from the position 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 removed whenever desired with the use of an ordinary switch hook.

From thelembodiment of our invention herein specifically described, other equivalent arrangements will be apparent, and it is to be understood that the invention herein is to be limited 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 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 surface lies and divergently with respect to each other.

2-. In combination, a base having a mounting surface, and an expulsion fuse and an expulsion lightning arrester removably mounted thereon, said expulsion fuse and expulsion arrester being arranged so that the gases attending the operation of the fuse are discharged in a direction divergent with respect to the direction of discharge of gases attending the operation of the arrester, and so that the direction ofv gas discharge from each is through the plane in which said mounting surface is positioned.

3. A protective device comprising a base of conducting material, upper and lower insulators 4 gnounted in spaced relation on said base, a sleet hood of conducting material secured to said upper insulator and extending outwardly therefrom, a line terminal member extending upwardly from said sleet hood, a line terminal secured at the upperend of said terminal member, a load terminal associated with the lower insulator, means including an expulsion fuse electrically connecting the line terminal to the load terminal, and an expulsion lightning arrester detachably mounted 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 gases attending the operation thereof through the plane in which said base is positioned.

4. A protective device comprising a vertically extending base ofconducting material, spaced upper and lower insulators mounted on said base, line and load terminals carried respectively by said upper and lower insulators, means including an expulsion fuse electrically connecting said terminals, an expulsion lightning arrester positioned adjacent said upper insulator in spaced relationship with respect to said line terminal, and means including a slot in said base extending downwardly from the top thereof for removably attaching said expulsion arrester to said 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 said upper and lower insulators, means including an expulsion fuse electrically connecting said terminals, an expulsion lightning arrester positioned adjacent said upper insulator in spaced relationship with respect to said line terminal, a slot in said base extending downwardly from the top thereof, and adjustable means cooperating with said slot for removably attaching said the gaseous discharge accompanying its operation is directed away from both said line and load terminals. 4

'7. In a protective device, the combination of a common vertically extending metal base having mounted thereon spaced insulated upper line and lower. load terminal'members, a removable fuse container pivotally mounted on the load terminal member and in electrical contact with the line terminal member, means including an expulsion lightning arrester extending horizontally from the top of said base in normally insulated spaced relationship to upper line terminal member for establishing a preferential sparkover path from the latter to the base, and clamping 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.