US529213A - Electrical - Google Patents

Description

(No Model.) 3 Shets-'-Sheet 1.

D. F. SWEET.

ELECTRICAL GUT-OUT. No. 529,213. Patented Nov. 13, 1894.

(No Model.) 3 Sheets-Sheet 3.

D. P. SWEET.

ELECTRICAL GUT-0H1 No. 629,213. Patented Nov. 13,1894.

] UNITED .STATES' ,IP TiiNT Drums;

DANIEL F. sWEETfoF GRAND, RAPIDS, MIoHIeAN.

' ELEGTRICAL our-our.

srnon ronrron {forming part'of Letters Patent No. 529,213, dated November is, 1894,

Applicationfiltdi'l'ulitl 9,1394. sentinel 514.020. '(llomudelb To all whom it may concern:

Be it known that l, DANIEL FRED SWEET,

a citizen of the United States, residing at Grand Rapids,.in the county of Kent and State'of liilichigamhaveinvented certaiunew and useful Improvements inElectric-Cut- O ut s, ofwhicl rthe following is a'epecificaev tion, reference being, had therein't'o' the accompanying drawings. This invention relates to an automatic cutout for electric circuits, saidcut-out being; adapted to instantaneously break the circuit u ponthe passagetherethyough of an abnorm al curren cgfi The essential objects of the present inventron are to prevent'destructive discharges at the contact plates when the circuit is broken and also to render the instrument more .deli-' cate 1n its ad ustment so that it may be setto quickly respond to any desired predetermined strength of current, as more f ully' herement of the swinging "is mounted; 2, an electro magnet mounted staj inafter set forth.

In the drawings, Figure l is a perspective view showing the instrument closed andconnected up inacircuit; Fig. 2, a side'elevation of the same, showing'in dotted lines the moveframe upon the passage of a destructive current; Fig.3, a detail plan of the upper portion of the swinging frame, carrying the movable contact plates; Fig. 4, a vertical sectional view of the same, detail vertical sectional view showing the'latch and the arm for releasing thesame. Referring to the drawings hynumerals,l designates the board upon which the instrument tionarilyupon a small fnrme 3 secured to the" lower end of the board; and 4, a rocking arma-- .ture pivotally mounted on frame 3 by means of screws 5 and provided with a vertical arm 6, in the upper end of which is nicely jour naled a roller 7.

Pivoted ina plate as securcd to the'board- 1 directly to the rear of the armature is an arm,

"9 carrying at its forward .end ablock 10,.

to normally bear upon the whose lower edge is sharpened and adaptedperiphery'of roller 7 above the journal of the same. This can edge carried by arm) is kept strongly pressed against the roller by a spring-ll, which bee-r's' upon thefront edge of" edownwardfextension from the armaturejecting, pointer bars of this frangecar by the lower one 'bring the armature nearer "pointer is moved down or up,

of arm 9, said extension resting in a vertical slot in plate 8.

The armature is adjusted omits pivotal bearing bymeans of a flanged cam 12. pivoted. on the board alongside the plate 8 an'dbearing' against an arm, 13 extending inwardlyv arm 6 to which it is at- 12 carries a laterally-pro M which works overa grad, uated scale on the board and serves toindicate the-strengthjofuurrent at which the'i'nstrument is set to'oper te. l 'A vertical frantic l5 composed of two uptached. The cam "right bars and two 0 oss-bars 16, is pivoted '3, said frame" be 7 at its lower end-upon ame ing insulated from its piiots 17. The upright ry thevmetallic contact plates 18' which are adapted to enter between the fingers of the stationary contacts 19,- car-1 ried by metallic holders or plates 2(J 'secured to the board. llhisframe, is held in its ver-' tical position bymeans of the latch 21 pivoted in'a slot in plate 8 and adapted to engage overthe u pper end of .a catch 22 carried of the cross-bars 16. This latch 21 is lifted oi? thecatch to release the frame by means off-an inwardly-projecting arm 23 secured rigidly to the upper end-of arm 6. The arm, 23 is so adjusted that it strikes latch 21 and lifts it from'its catch the instantthe knife edge carried byfarm 9 passes over the vertical-center of the roller, so that the instant the armature is released from said.

arm 9 the verticalframewill also be released from the latch.

- It will 'be observed' thatby swinging the pointer or at m j 14; along the scale, the cam 12, through the medium of arms 1.3 and 6, will to-or fartherfrom according as said said arm 13 being normally held against the of the cam by-the action ofspring 11 and arm 9 which causes the knife edge to bear downthe poles of. the magnet,

inclined edge forcibly upon thoroller at' a point in from of x or beyond itsjournaland thereby tend to forcesaid arm 6 normally inward toward the board. Before the poles of the magnet can draivthe' "armatu re down the attractive force mustouercome the resistance caused by the knife-edge of hlocla 1Q pressing upon the rollerin'front .of the; center. of its journal; as isevident. 182

is therefore obvious that the point at'which the instru'ment'isset to operate may be varied by simply adjusting the arm 6 (carrying-the roller) so as to bring the knife-edge nearer to or farther from a vertical line drawn con-- from part 22, and then as the arm 6 is swung forward by the downward movementof the armature said arm strikes forcibl'y'against a stop 24 carried by the lower cross-bar ltiand quickly and forcibly throws down the swinging-frarne to the' 'position shown indotted lines at A in Fig. It will alsoibe observed that after the knife-edge passes over the ceuport except at their upper ends.

.These' lower carbons are ter of the roller the pressure o'fjthe spring 11 will tend to pre'sssaidroller 7 outward audl thereby assist the armature inthrowing down the frame. I j f Alongsii-ie each'pairof contact plates 18 and. 19 is arranged-a pair of supplemental carbon. contact. plates 25. The upper ends/of the stationary plates are clamped in sockets 26 formed on the sameplates warms contactplates 19, and said plates areinclined down wardly and forwardly and ail e without suplhe lower, movable plates or carbons 25 hear about midway their length against the. lower ends ofv the upper plates and are seen red at their lower endsin sockets 27 ca-rried by independent shafts 28 journaled in the swinging frame. kept normally pressed against the lower ends'of the upper plates by means of convolut'e springs. 29 secured on said shafts 28 andco'nnected to the adjacent cross-bar 16. p The normal current passes th'lreugh the me tallic contact-plates, as they-present the-least resistance," and through the upper part ofthe swinging frame,

the frame thereby forming a part of the circuit, but. when a sufficiently abnormal current passes throughthe instru ment and the swinging-frame is released and. thrown downin the manner hereinbeforede I scribed, the current ceases to pass through the metallic contact-plates the. instant they are separated and-passes wholly through the -.carbon or supplemental contact-plates- It will, be observed that by-the timethe metallic I contact plates havebecome disconnected, the spring-actuated carbon plates have swung forward far enough to'lie flat against the upper carbeus, as shown in dotted lines at'B' in Fig.2, andas the frame falls downward themoyable carbons. are drawn or slid down upon the faces of the stationary carbon until they drop off the lower ends of. the same.

The object and advantages of this peculiar action of the supplemental plates are obvious. Thus throwing the current into the carbon contact plates relieves the metallic contact plates from destructive sparking and materially retards the. abnormal current, as the carbon presents a higher resistance; and by bring-- ing the carbons up fiat against each otherat then sliding the contacting carbons apart endwise, the resistance is gradually increased the instant. the metalliccontacts separateand until the carbons separate, by which time the strength of the current has been so-reduced by the increase in the length of resistance medium that the discharge, if there be any at all, is reducedQtQr-fa harmless minimum. In this manner the heaviest currents may be sent through the instrument without causing noisy or destructivedisch-arges a the contact plates, and herein-lieso'ne-"of the .QSSBDIZIBJ advantages of'the instrument...

The numeral 30'designates a 'pin securedin each of the shafts 28 and adapted to strike against the'upper crohs-bar 16 as soon as the movable carbons slip off the uppercarbonsand therebyprevent the springs rotation said shafts farther than is necessary.

It will be observed that the action of the convolute springs not only tends to keep the carbons in contact but also assists in throwing down the swinging frame.

:A handle 31 is secured to the lower crossbar of the swinging frame in order to lift it after it is throwu down, andasimilar handle on knob 32 is'secu red to the-armature.v \Vhen the swinging frame drops down the handle31 strikes againstand rests in a curved spring 33 secured'to the lower part of frame 3.

Itis understoodithatasolenoid is the equivalentof'a magnet i u this construction and I do not therefore confine mvself to the use of a'magnet.

Having thus fully describedmy invention, .what I claim'is.- p a 1. A circuit interrupting-device consisting ofan electrical magnet responding to the actionof anabnormal current, main contact plates and an armature adapted to separate saidlmain, contact plates,and a pair of high-re sistance supplemental contact platesadapted to overlap a .tl 1eir free ends and slide upon each other endwise and thereby increase the resistance gradually until they-separate and break, the contact, which is after the separation of the main contact plates, substantially as and'for the 'purposedescribed.

2. The combination in an automatic .elec- -tric cut-out, and an electrical magnet in the circuit, an armaturev therefor adapted to be actuated bythe presence of an abnormal current, main contact plates adapted to be sep arated bythe-action of the armature, and a.

pair'of supplemental carbon contact plates.

adapted-to receive and retard the current after the-separation of the main contact-plates,

- against each other said'carbon plates overlapping each other at their free ends and being normally pressed and adapted to slide apart endwise to gradually increase the length of the resistance medium bet'ore separation, substant-ially as described.

3. The combination, in an electric cut-out,

of the main contact-Plate movable part oarryingone of thecontact plates, a'pair of supplemental -high resistance contact-plates,

one-ofsaid supplementalplates being carried by said movable part and having its free end overlapping the free end of "the other suppleniental'contact, and means for-normally press:

so cuit, an

predetermined abnormal current, main con-' tact plates in the circuit and adapted to be ing'the'overlapped ends of said supplemental contact plates together and holding them together as-they are slid apart endwise, as and for the'purpo's 'es setforth.

:4. Inan automatic cut-out, the-combina "Lion of an electrical magnet inthe main cire armature adapted to respond'to any.

separatedlby the action of the armature, and supplemental tact-plates, one oi said carbon plates being stationarily supported and-the other being. movably supported at an angle to the sta-- 3.

tiona'ry plate and normally pressed against the free end-of the same, substantially as de-' scribed;

The combinat on of an electrical-magnet: in the main circuit, an armature adapted to" be actuated by the pre'sence of/an abnormal current a swinging frame adapted tobe actuated by said armature, main contact-plates carried by said swinging-frame, supplemental carbon contact-plates, one of the carbon plates being supported 'stationarily and hav: ing one end tree and the other carbon plate being carried byashaft journaled in the I frame, a spring for actuating said shaft and .lceeping the movable carbon normally pressed carbon contact-plates adapted to be separated subsequently to the main conagainst the stationary carbon, substantially as described.

- 6. In an electric, cut-out, the combination ofan-electro magnet, an armature carrying an arm and pivotally supported, a roller journaled in said arm, a'spring pressed arm car 7. In an electric cut-out, the combination of an electro magnet, an armature carrying a roller and pivotallysupported, aspringpressed arm normally bearing on sai'd roller,

means for adjusting said armature and roller,

a vertical frame pivoted at its lower end and carrying contact-plates at-its upper end and adapted to be thrown. down a-nd'released, a latch engaging said-frame and holding it up,

an arm carried by. the armature and adapted to disengage said latch npon the passage of anabnormal current, substantially as herein shown and described. .8. In an automatic electric cut-out, the combination of anelectro-ma'gnet in the main ciredit, an armature adapted to be influenced by the magnet, a movable frame or part carrying a high-resistance contact-plate, and adapted to be operatedby the magnet,'another high resistance contact-plate these plates in contact and sliding them apart as the contact is. broken, whereby the resistance medium is'le'ngthened while-the" contact.

is being brok.en,-substantially as described.

iv adapted to lie on the. movable contatstplate, an means for holding .ln testimonywhereoflafix mysignaturei' presence of two witnesses. i DANIEL .F. SWEET Witnesses:

Maura S. TOOKER, Jomv W. GHAMPLIN.

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