US1777072A - Electric switch - Google Patents

Description

Sept. 30, 1930. s. A. BURNHAM ELECTRIC SII'I'CH Filed April 14. 1926 2 Shuts-Shoot 2 Qu M Patented Sept. 30, 1930 (moms; 3111mm, or sevens, imss'acnusm-rs; na'srear'on fo eommmmn MANU FACTUBINGCORPORATIUN', OFSOU'I'H' 0F ELSSICHUSETTS Animation ma April-14,

This invention relates to oilimmersql high tension electric switches; v i

The terminals of an electric'switeh must have sufl'lcient spacing to prevent-flash-ov ers between thmmand where'air is the insulating ,medium, the terminals must necessarily be spaced widely apart to provide 'suificient' In; sulation, ii high voltaiges are employed To provide the requisite spaeing with vertically disposed illstlhtiflg bushings wouldnews sit-ate switch ming d-prohibitive: size; so it has been-oommonpmctie'e torobtainthe desired spacingat the terminal end-0f the bushingby-inchning the bushings outwardly; This construction; an increased spacing? at the' topof' the insulator, must necessarily decrease-the spwingzaat the lower end of the insnlator; i To aicertain extent this'may he pemnissib'le since'the lower exposed terminals of'the insulatorfare im'e in oil; but it isevident that ifthe:

bnshings are. inclined to any great extent, the lateral: dimensions of the'switch' casing. must beincreasedto maintaina safe-'spacingof the lower terminals.

An object of thisinvention is the provision 'of an electrie'switchrandzinsuletingtbnshings iorthe switch studs so manged'that a relatively wide spacing 6025 the exposed terminals o fithe studs :is vpncw ided-with a switehcesing of moderate dimensions.

A further object is generally to improve the construetim of electric 'swit'ches'andfsimilar' tus.

7 Certain features herean described are: described and'claimted in my co-pendingrapolications' Serial No; 729,'685,yfiled-:A g =-1, i924; all-dismay -102,069,- fil0d April 14, 1926.

Fig: l'is a seotionul ele'mtiencoi melectsic switch embodying the invention,

-. Fig. 2is' a sectionsl selewitionthnongh. an insulatingbushingtoi -Fig. 11; Y

Fig; 32 is a: sectie'mala-elevilti'on-of a modified form of electric switch embodying the'invention;

I The electric switch iiimmmi 'Fig'. 11ineludes an enclosing caaihgicompriaingithe oil -recepttacle 10- and thvswitchframe-12 which forms a cowerfo'r seid 'mceptacle." Said shame and insuiater j approxiim/tely ms; sum in; lama-n.-

m mssw Summon ow ELECTRIC swn'cn is provided with. a top wan'wmeh'hastwd V,

downwerdly inclined opposed sections 1-4: and 16 each formed with an "aperture therethroughw Amechanism well 18,is earried by theswitch-frame under the top wallnnd'abo ut in theyert'icalline of the casing, and suitable operatings neohsnism QOiscontained therein;

A movable switch member 22 is connected ithsaid-mechenism and depends therebelewl and is provided at its lower end with a bent metal tube 28 so shaped as to rovide an approximately vertical lower section 3O an'd an outwardly imlined. upper section which is appnoximately perpendicular with an in;

'clined section of the top wall of -the switch aperframe. I Said tube extemk through the ture in said inclined section depends therebelow end-is provided with ontstand flange its upper endwhieh covers said aperture; and; is secured to said wall'b boltsifi A tubular "insulatin -hod orshe :isdisposedon the-upperend 0% mi tube and in line with-thecpening therein andhes a clamping flange; 38 at-itslower'end wbicliis seemedto- 881d fiange 34 46. .As time arranged, said insulator-shell isextendupward 'and; at an angle outwaralk-awaly the e ltioalmsis of the *said shell may be provided with snitab e--pettia mp ssa'i s u smmh eh insulater thus described is .tretednwre-partieulaml ?in;Eig, QQaee m risingg mcondletorfiw ichextendsikmngh v ss y therewith-and is-conneetedtesaid contact 'WandMnpper terminaQnember-of-the is; vertically disposedl within the conductor-structure is formed from asection of commercial high tension cable and shaped as above described and as set forth more specifically in my above-named "copending ap-' plications. 4 r V I g By the provision of the insulators above described, the lower ends thereof may be vertical and relatively closely spaced under the oil,'so' that the casing may be ofmoderate diameter, whilepreserving adequate insulation between the casing and conducting com'po nents'of the switch. At the same time the ex posed insulator terminals may be widely spaced in air and'thus may be well insulated against flashovers therebetween. r

; The'oil level in the casing is adapted to be somewhat above the lower ends of the metal tubes of the insulators whereby to prevent corona thereat. i In the switch, illustrated in Fig. 3 the switch frame is modifiedtotake the place of the metal tubes of Figs. 1 and 2. As illustrated in this "figure the switch frame 12 is formed with thehorizontalbottoniwall 60 and the top wall 62 which is spaced above said bottom wall and is provided with the opposed and downwardly-inclined Wall-section '64 and 66. The walls 68 of a'mechanism well 7 0 connectthetop and bottom walls and divide the space therebet' ween into two compartments 7 2 and .74, each of which is equivalent to the metal tubeof Figs. 1 and 2. Insulators 76 and; '7 8 are carried by said top and bottom walls, respectively, and conductor -structures 80 extend through said insulators and the compartments 7 2 and 74-fand' are connected with terminal-connectors 82 at the tops of said insulators? 6 and withcontact blocks 84 at the bottoms ofsaid insulators 7 8 The construction may be otherwise modified without departing from the spirit of the invention.

1. In an electr calapparatus, the 'combination of an enclosingcas ng,approx1mately vertical insulator-bodies carried by and depending w1th1n-sa1d casing, companion insulator-bodies carried by said casing and extended upwardly and outwardly therefrom in' angular relation to-saidfirst insulatorbodies, terminal connectors carried by the lower ends of said first insulator-bodies, and bent continuous conductors extended the communicating passages insaidinsulator-bodies and having aconnection with said terminal connector. r 3. An BlBCtIlC'SWltChcomprising the combination with an enclosing casing of a pair of insulator bushings having theirexposed portions extending upwardly from the easing in diverging relation, each bushing'conn prising an approximatelyevertical insulatorbody carried by and depending within said casing, a second; insulator-body carried by sald casing and extended outwardly there froni'at an angle with said first insulatorbody, and a continuous conductor extended through both insulator-bodies.

4. An electric switch comprising the com-' bination with an enclosing casing of a pair of insulator bushings having their exposed portions extending upwardly from the casing in diverging relation, each bushing comprising an approximately-verticalinsulatorbody carried byand depending within said casing, a second insulator-body carried by said casing and extended outwardly therefrom at an angle with saidfirs't insulator-1.

body, a contact member carried by the lower end of said first insulator-body, a movable switch member cooperating with saidicon- 'tact member, and a bent continuous conductor extended through both insulator-bodies and having a connection with said contact member. i

i 5. Anelectric switch comprising the combination ofan enclosing casing, a pair of -insu'lating'bushings extended through said -cas1ng, saidbushings having approximately vertical and parallel lower: insulating sections and divergent upper insulatingl sections, and switch mechanism disposed abetwe'enisaid bushings aboveithe vertical sec tions thereof. v p I 6. An electrical apparatus having the combination of'an enclosing casing and a pairpf insulated terminals therefor, each 'termi'nal' comprising a bent tube extended i throughsaid casing and having an approxi :mately vertical lower section and an upper section which is inclined away from the ver- 'ti'c'al lower section, an insulator-body atltached-to' and depending from'the end ofi.

said vertical section in line therewith, a terminal connector carried by said insulator body at its lower end, a second insulatorbody attached to the end of said upper inclined section and extended upwardly therefrom and above the casing and at an inclination from the vertical and a bent conductor extended through said tube and insulator-bodies and having a connection with said terminal-member.

7 An electric switch having the combination with an oil-containing casing of a pair of insulator bushings having their exposed portions extending from the casing in diverging relation, each bushing comprising a bent tube carried by said casing and having a lower vertical section which extends below the oil level in said casing and an u per section which is inclined away from tlie vertithrough said metal and insulator-shells and having a connection with said contact member, a movable switch member cooperating with said contact member, and supporting means for said bushing having a connection with said metal shell and with said casing.

In testimony whereof, I have signed my name to this s ecification.

EORGE A. BURNHAM.

cal, an insulator-shell attached to the end of and depending below and in line with said vertical section, a contact member carried by the lower end of said tube, a second insulatorbody attached to the end of and extended upwardly beyond said inclined section at an inclination with said casing, a bent conductor extended through said tube and said insulator-bodies and having a connection with said contact member, and a movable switch member cooperating with said contact member.

8. An electric switch having the combination with an oil-containing casing of a pair of insulator bushings having their exposed portions extending from the casing in diverging relation, each bushing comprising a bent tube carried by and disposed mainly within said casing, said tube having an approximately Vertical lower section and an upper section which is inclined away from the vertical, an insulator-body attached to the end of and depending below said vertical section and in line therewith, a contact member carried by the lower end of said insulator-body, a second insulator body connected with the end of said inclined section and extended outwardly in line therewith and upwardly above and at an inclination with said casing, a bent conductor extended through said metal tube and insulator-bodies and having a connection with said contact member, and a movable switch member cooperating with said contact member.

9. An electric switch comprising an oil casing having a pair of switch terminals, each terminal comprisin an insulating bushing having a metal,she 1 provided with an approximately vertical lower section and an upper section which is inclined away from the vertical, an insulator-shell attached to the end of and depending from said vertical lower section, a contact member carried by the lower end of said insulator-shell, a second insulator shell attached to the end of and extended upwardly from and in line with said upper section, a bent conductor extended

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