US1391966A - Electric-circuit breaker - Google Patents

Description

E. M. MOLLEH.

ELECTRIC CIRCUIT BREAKER.

APPLICATION FILED AuG.2s. 1919.

PatentedSept. 27,1921.

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ELECTRIC cmcun BREAKER.

APPLICATION FILED AUG-28,1919.

Patented Sept. 27, 1921.

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ELECTRIC CIRCUIT BREAKER.

APPLICATION FILED AUG.28, I9L9,

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ELECTRIC CIRCUIT BREAKER.

APPLICATION FILED AUG-28,1919.

PatentedSept. 27, 1921.

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I E. M. MOLLER.

ELECTRIC CIRCUIT BREAKER.

APPLICATION FILED AUG.28. 1919.

Patented Sept. 27, 1921.

7 SHEETSSHEET I.

/I T'TURNE UNITED STATES PATENT "optics.

EDVARD M. MOLLER, OF JERSEY CITY, NEW JERSEYH ELECTRIC-CTBCUIT BREAKER.

To all whom it may concern:

Be it known that I, EDV RD M. MOLLER, a citizen of the United States, residing at Jersey City, in the county of Hudson and State ofNew Jersey, have invented certain new and useful Improvements in Electric- Circuit Breakers; and. I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to characters of reference marked thereon, which form a part of this specification.

This invention relates, generally, to improvements in circuit-breakers; and, the present invention has reference, more particularly, to that class of circuit-breakers foruse upon trolley or electric railway cars.

The present invention has for its principal objects to provide a simply-constructed tripping-mechanism in which a magnetically controlled tripping mechanism is released whenan excess charge of electricity passes into and through the assembled devices and parts of the device or apparatus, thereby furnishing protection against too heavy overloads or grounds, and short circuits which may occur in the car-equipment.

' Other objects of the present invention are simplicity of construction of the mecha- 'nism; readiness of installation of the apparatus between the trolley-cable and the controller, the apparatus being light in weight, and being of high capacity and most efficient in its operation.

i Still other objects of the present invention not at this time more particularly enumerated will be clearly understood from the following detailed description of the present invention.

With the various objects of the present invention in View, the saidinvention consists, primarily, in the novel car circuit breaker hereinafter more fully set forth; and, the

present invention consists, furthermore, in

Specification of Letters Patent. Patented Sept. 27, 1921- Application filed August 28, 1919. Serial N0- 320,508- v The invention is clearly illustrated in the accompanying drawings, in which F1gure 1 is a plan or top view of the cir-' cult-breaker embodying the principles of the present invention, the box or casing in WlllCh the mechanism is housed being represented in horizontal section; and Fig. 2 is a vertical sectional representation ofthe same, said section being represented as taken on line 2-2 in said Fig. 1, looking in the direction of the arrow as.

Fig. 3 is a similar sectional representation of the mechanism, said section being taken on line 33 in said Fig. 1, looking in the direction of the arrow y, the upper member of the box or casing, however, being omitted from said view.

Fig. 4 is a plan or top view of the circuitbreaking mechanism, showing the several parts thereof in their relative position, when the circuit is broken, said view being made on aslightly reduced scale, with the box or casing-members omitted from said view; and

'Fig. 5 is a detail vertical sectional represen- I casing member; with the mechanism removed therefrom; and Fig. 7 is a longitudinal vertical section of the same, said section' being taken on line '77 in said Fig. 6.

, Fig. 8 is a bottom view of the upper box or casing-member; Fig. 9 is a side elevation of the same, looking in the direction of the arrow a in said Fig. 8; and Fig; 10 is a transverse vertical section of the same, said sec-- tion' being taken on line ,1010 in said Fig. 9. a

Fig. 11 is a plan view of the arcing box or element employed with the mechanism; and Fig. 12 is van elevation of the same, looking in the direction of the arrow u'in said Fig. 11. Fig. 13 is a plan view of the overload or blow-out coil of'the circuit-breaker, the upper member of said coil being omitted from said view; and Fig. 14 is a view of the said 1 coil, partly represented in elevation and partly shown in vertical section.

Similar characters of reference are employed in all of the said above described views. to indicate corresponding parts.

Refering now to the several figures of the drawings, the reference-character 1 indicates the lowerbox or casing member of the apparatus, the same being ofany suitable configuration, comprising a top 2 and bounding side-walls 3 andend-walls 4, all mounted upon a closing base-plate 5, substantially as shown more particularly in Fig. 2 of thedrawings, and the various members of the said box being made, preferably, of a material which is a non-conductor of electricity,.or being suitably insulated so as not to act as an electrical conductor. Suitably mounted above the top 2 of said lower box 10 having holes or perforations 11 for the attachment of the circuit-breaker in the desired location upon a car, or other place of location.

Similarly,-within the interior of the upper box or casing-member 6, the latter is provided with suitably disposed lugs, as 12, formed with internally screw-threaded receiving sockets 13 for the reception of the screw-threaded shanks of tightening studs or bolts 14 which are inserted into and through tions 15 1n the top 2 of the lower box or casing-member 1 for properly securing the two members'l and 6 together in operative relation, as will be clearly evident. In one of its side-walls 8, the upper box or casingmember 6 is provided with suitabl disposed openings, as 16 and 17, and in its opposite side-wall the said box or casing-memer 6 has an opening 18, the pur ses of which will hereinafter be more forth. The said up r box or casing-member 6 is also PI'OVI ed withva laterally ex-' tending partition 19 of the same material of which the box or member 6 is made, said partition having an opening 20. To secure the base-plate 5 to said lower box or casingmember 1, the latter is provided with suit-' ably disposed lugs, as 21, formed with internally screw-threaded sockets, as 22, for the reception of the screw-threaded shanks of studs or screws 23, which are inserted into and through correspondingly located holes or perforations 24 in said baselate 5, as indicated more particularly in igs. 6 and 7 of the drawings.

The said up or box or casing-member 6 is also formed in one of its end-walls 9 with an opening, as 25, see Figs. 1 and 2 of the drawings, into and through which extends and projects, as shown in said Fig.

roperly located holes or perforally set 2, a suitably formed arcing-box or element I member 1, said screws 27 being insertedv through holes or perforations 28 in said topplate 2, and the screw-threaded shanks of said screws 27 being screwed into the internally screw-threaded receiving sockets 29 with which the partition 19 is provided.v Referring now more particularly to Figs..

2, 3, 13 and 14 of the drawings, 'it will be seen, that disposed against the lower surface of said top-plate 2 is a layer of insulating material 29, and secured against the latter, by means of a bolt or screw 30, is a magnetic field-pole-piece or element 31 of soft iron, said pole-piece or element having a downwardly extending portion .32 terminating, near the base-plate 5 and extending longitudinally within the lower box or casingmember 1, in a carrier-member33. Suitably secured upon the free end-portion of said carrier-member, by means of a screw 34 or in any other suitable manner, is an upwardly projecting stem or rod 35 of metal, said stem or rod extending into and through a properly located hole or opening 36 in the top-plate 2, and being provided upon its upper part, which is located within the upr box or casing-member 6, with an enargement, as 37, formed with a screwthreaded receiving socket 38, for the pur- }sioses to be presently more fully described. urroundin that portion of the stem ,or rod 35, withln the lower box or casing-member 1, and resting upon the carrier-member 33, is a tubular core 39 ofsoft-metal, and concentric with this core is a coil-spool, as

40, said spool being made of. fiber "or other insulating material. The overload or blowout coil carried by said spool, consists of layers of flat copper 41'. alternating with disks or layers 42 of cement paper, or the like, and 43 and 44 indicate the respective end terminals of the co per coil, said terminals -being respective y; rovided, with holes or perforations 45 an 46, in alinement vertically with corres ndingly located holes or perforations 4 and 48 inthe top-plate 2. Mounted upon the up er surface of said top-plate, and locate within the up r box or casing-member 6, are a pair 0 cable-receiving and clampin elements, as 49 and 50, see Figs. 1, 2 and 3 of thedrawings, the said clamping elements being secured in place by means of screws 51 and 52,'respectivel which are screwed into the screw-threade holes 53 and 54 with which the top-plate 2 is provided, the cableclamping jaws of the. respective clamping elements 51 and 52 being, respectively, further provided with binding or clamping screws or bolts 55 and 56. Extending downwardly from the res ective clamping elements 51 and 52, an projecting into and through the respective holes or perforations" their assembled relation by the usual arrangement of nuts, as 59 upon the said contact-lugs or studs 57 and 58, as will be clearly evident from an inspection of the drawings.

Referring now more particularly to Fig. 2 of the drawings, it will be seen, that there is mounted upon theupper end-portion of' the enlargement 37 of the previously-mentioned stem or post 35, a disk or plate 60, said disk or plate being held in place by a screw 61 which is screwed into the receiving. socket 38, as indicated in dotted outline in said figure. Suitably-mounted upon the upper surface of said top-plate 2, by means of screws 62, or other suitable fastening vmeans, is a plate 63, preferably formed with a reinforcing rib 64, and a pair of upwardly extending members 65 and 66, respectively formed with bearing- portions 67 and 68. The said plate 63 is also provided with a suitably disposed hole or perforation 69 through which the rod or stem 35 projects, with the enlargement 37 of said rod or stem resting directly upon said plate, in the manner indicated in Fig. 20f the drawings. Os-

cillatorily disposed upon the enlargement 37 .of the rod or stem 35 is the hub 70 of what is known as the switch-arm, said hub having an arm 71 extending therefrom, said arm being providedat its*free end with a bifurcated member 72, carrying a with a'roller74 mounted uponsaid pin. At right angles to said arm 71, or approximately so, are a pair of other arms, as 75,

located one above the other, said arms 7 5' having angularly disposed perforated endmembers, as 76, carrying a in 77. Pivotally mounted upon this pin 7 is a' contactlever or member, as 78, provided at one end with a clamping element 79, between the clamping members of which is disposed, and securely clamped by means of a tightening bolt or screw 80, the one end-portion of acopper series wire or cable 81, the other end-portion of the latter being securely clamped between the clamping members of the, previously mentioned overload and blow-out coil-terminal 49. The clamping element 79 of said lever or'member 78 is also provided with a perforated portion 82 to which is attached the one end-portion of a coiled spring 83, said spring having its other end-portion secured to a perforated lug 84 extending from the member 66 of the pin ,73

plate 63. Upon its opposite end, the said' contact-lever or member 78 is provided with a post-like portion or extension, as 85, formed with an abutting off-set 86, and seated against said post 85 and its off-set 86, and secured in its position, by means of a bolt or screw 87, is a copper contact-establishing member 88, having a contact-tip .89 the surface-portion 90 of which is suitably curved or chamfered to provide a gradual breaking surface and to prevent excessive arcing, as will. hereinafter be more fully set forth. Secured to said contact-establishing member, by means of the bolt or screw 87, and resting against the back of the contacttip 89 is an angular arcing horn or deflector, as 91. Secured upon the upper surface of the .top-plate 2, in suitable location, by means ofsc'rews 92, or in any'other suitable manner, isa bar-like member or post 93, carrying a clamping element 94, between the clamping member of which is securely clamped by means of a tightening bolt or' screw 95, the end-portion of a leading-in wire or cable 96, leading from the usual trolley-wheel.

This clamping element 94 is also formed with an abutting offset 97, and. seated against said element 94 and its ofi-set 97, and secured in its position, by means of a bolt or screw 98, is another contact-establishingmember 99, having a contact-tip 100, i

the surface-portion 101 of which is also suitably curved or chamfered', which under nor mal initial conditions is electrically in contact with the contacting surface 90 of the contact-tip 89. Secured to said contact-establishing member 99, by means of the bolt or screw98, and resting against the back of mentioned arclng box 26, located in the endwall 9 of the upperbox or casing-member 6, the said box comprising a bottom-member 104, ,a top-member 105, and intermediate sideswalls 106 and 107, to which said members 104 and 105 are secured by means of screws 108. As shown in Fig. 11 of the drawings, the said arcing-box 26 is usually provided with a receiving socket 109 into which is adapted to be fitted a stud or post, as 110, connected'with and extending from a lug or projection 111 with which the box or casing-member 6 is provided, substantially as illustrated in Figs. 8, 9 and 10, the purpose being to properly locate and hold the said arcing box 26 in position. Located above the top-member 105 of said arcing box 26 is a magnetic-field pole-piece or block 112 having an arm 113 the end-portion of which extends along the inner surface of the ing engagement.

vided with a perforated lug 120, or other 'hold the same in place.

the hub-portion 117 of a pawl made in the manner of a bell-crank, said pawl comprising an arm 118 formed with an off-set 119 with which the roller 73 of the arm 71, under normal initial conditions is in hold- The arm 118 is also prosuitable means, to which is secured the, one end of a tension spring121, said spring having its other end secured to a perforated lug 122 extending from the hub-portion 123 of a handle-lever 124, as shown in Figs. 1 and 4 of the drawings, the hub" 123 of said lever being mounted upon the enlargement 37 of the stem or rod 35,'andthe said lever extending into and through the opening 18 in the side-wall 8 of the box. or casingmember 6; asv shown. The said'pawl also comprises another arm 125 having a sleevelike or bifurcated end-portion 126 in which is movably disposed a portion of'a tripping rod 127, said rod having its oneend-portion slidably disposed in the correspondingly perforated up er end-portion 128 of the post 116 and aving pinned or otherwise secured uponsaid rod, between the end of the tripping arm 125 of the pawl and the said end-portion 128 a collar or enlarge,- ment, as 129. Mounted in the previously mentioned bearing- portions 67 and 68 is a pin or rod 130, and oscillatorily mounted upon said pin or rod 130 are downwardly extending perforated ears or bearing-mem bers 132 of a suitably formed tripping armature 131 having a. portion 133'located directly above the disk or plate 60 which is carried by the enlargement 37 of the stem or rod 35, and which disk or plate 60 attracts the said portion 133 when the stem or rod-35 and its enlargement 37 and said disk or plate 60 become an electromagnet. One of the said ears or bearing members 132, as will be seen from an inspection of Fig. 5 of the drawings, extends in a downward direction and is of such length, as at 134, that it acts in the manner of a crank, said extension 134 carrying a pin 135 with which is oscillatorily connected the perforated endportion 136 of the previously mentioned tripping rod 127.

At or near the other perforated ear or bearing-member 132, the said tripping armature .131 is formed with a laterally perforated extension, as 137, in which is a pin 138, upon the extending portion of which is screw-threaded rod or stem 145, said rodor stem bein nut 146 and piece 147.

Secured to said nut 146 is an adjusting tension spring 149, said spring being also attached-to said link 141. Mounted upon said rod or stem 145 is a jamb-nut 148,

capable of adjustment in a aving a manipulating fingerwhich is adapted to be screwed against the face of the bracket-member 143 so as to lock the parts in their fixed adjusted positions, as will be clearly understood. Suitably connected with the clamping element is a leading-out wire or cable 150.

Having in the foregoing description set forth the construction of the circuit-breaker, and also the general arrangement ofthe several devices and parts, we will now set forth, briefly, the operation of the several devices and parts of the circuit-breaker.

Under normal initial conditions the several devices and parts of the circuit-b'reaker-are in the relative positions indicated in Figs. 1 and 2 of the drawings, the various parts being set and held in such a manner, that the two contact- tips 89 and 100 are in contacting engagement, as shown, and whereby a complete electrical circuit is established with the main line, through the wire or 'cable96, into andthrough said contact-tips '89 and 100, thence through the contact-lever or member 78, and through the clamping element 79, the shunt-wire or cable 81, and the clamping element 49 into and through the copper layers 41 of the overload or blow-out coil 40, from which the current passes into the clamping element 50 into and through the leading-out'wire orcable 150. to the main circuit-wire.

no dangerous overload in the completed circuit. When, however, there occurs such overload, the increase current in the over- This condition exists as long as there i. Y

load or blow-out coil 40 sufiiciently magnetizes the core or rod 35, its enlargement 37 and the diskor plate 60, so as to attract the tripping-armature 131. The pivotal and downward movement of said armature 131, thus produced, causes the trip ing rod 127 to be moved in-the direction 0 the arrow 2: in Fig. 5 of the drawings, thereby forcing the collar or enlargement 129 on said rod against the bifurcated end 126 of the tripping arm 125-and causing a sufficient piv-' otal movement of the previously mentioned bell-crank which throws the retaining oifset 119 out of its holding engagement with 5 the roller 73 of the arm 71, as lndicated in Fig. 4. Simultaneously, the tension spring 68 exerts its, pull, so that the several arms 72, 75 and 7 8 assumethe positions indicated in said Fig. 4, with the electric circuit interrupted or broken by the disen aged contact- tips 89 and 100, as will be 0 early evident. To again set the parts of the appaing or breaking the electric circuit, the han-- dle-lever124 is moved in the direction of the arrow w, see Fig. 1, thereby causing a stud or projection 151 on said handle-lever to ride agalnst the inclineor angular surface 153 of a projecting member 152 extending from the side-edge of the arm 118, thus also actuating the bell-crank, and causing the various-parts to assume the'positions indicated in said Fig. 4 of the drawings.

From an inspection of Fig. 2 of the drawings, it will be seen, that the magnetic polepleces 31 and 112 provide a magnetic field across the gap formed by the separated contact- tips 89 and 100 and across the space between the walls 104 and 105 of the blowout box 26, whereby the arcing produced by the separating contact-tips and the generated gases will be forced by magnetic blowout, through said box, and from the opening of the same, outside of the upper box or casing-member 46.

tion of the lines of magnetic force are across the gap. between the walls 104 and 105, through the pole-piece or block 112, through the arm 113, across the air-space between the end-portion of said arm 113 and the tripping armature 131, through the latter,

parts, as well as in the details of the .con-' struction of the said parts without departing from the scope of the present invention'as set forth in the foregoing specification, and as defined in the clauses of the claims which are appended to the said specification. Hence, do not limit my present invention to the exact arrangements and combinations clamping element and one of said terminal Reterring again to said Fig. 2, the direc- Of course I am aware that changes may of the said devices and parts as described in the said specification, nor do I confine myself to the exact details of the construction of the said parts, as illustrated in the ac-- companying drawings.

I claim 1. In an overload circuit-breaker, in combination with an overload coil, and a pair of terminal-clamps with which the respective terminals of the coil are connected, a magneticcore connected with said overload 0011, a switch-arm -:oscillatorily mounted 'upon said core, a spring-controlled contact-lever connected with said switch-arm, a contacttip carried by said switch-arm, a fixed contact-tip with which said first-mentioned contact-tip i normally in contact, a clamping element carried by said contact-lever, an electrical series-connection between said clamps, and a tripping means for releasing said contact-lever and breaking the electrical contact between said contact-tips.

2. In an overload circuit-breaker, in combination with an overload. coil, and a pair of terminal clamps with which the respective terminals, of the coil are connected, a magnetic core connected with said overload coil, a switch-arm oscillatorily mounted upon said core,a spring-controlled contact-lever, a means of pivotal connection between said contact-lever and said switch-arm, a contacttip' carried by said switch-arm, a fixed contact-tip with which said first-mentioned contact-tip is normally in contact, a clamping .element carried by said' contact-lever, an

electrical series-connection between said clamping element and one of said terminal clamps, and a tripping means for releasing said contact-lever and breaking the electrical contact between said contact-tips.

3. In an overload circuit-breaker, in combination with'an overload coil, and a pair of terminal-clamps with which the respective terminals of the coil are connected, a magnetic core connected with said overload coil,

a switch-arm oscillatorily mounted upon said core, a spring-controlled contact-lever connected with said switch-arm, a contacttip carried by said switch-arm, a fixed contact-tip with which said fiI'St-IIIGIItIOHGd contact-tip is normally in contact, a clamplng element carried by saidcontact-lever, an electrical series-connection between said clamping'element and one of said terminal clamps, and a tripping means for releaslng said contact-lever and breaking the electrlcal contact between said contact-tips, con: sisting -of a pivotally mounted trippingarmature adapted to be attracted by the core of said overload coil, a releasing means normally in engagement with said switch-arm, and means between said releasing means and the tripping-armature for actuating said releasing means.

4;. In an overload circuit-breaker, in combination with an overload coil, and-a pair of terminal clamps with which the respective terminals of the coil are connected, a magnetic core connected with said overload coil, a switch-arm oscillatorily mounted upon Said core, a spring-controlled contact-lever, a means of pivotal connection between saidcontact-lever and said switch-arm, a contact-tip carried by said switch-arm, a fixed contact-tip with which said first-mentioned contact-tip is normally in contact, a clamping element carried by said contact-lever, an electrical series-connection between 'said clamping element and one of said terminal clamps, and a tripping means for releasing said contact-lever and breaking the electrical contact between said contact-tips, consisting of a pivotally mounted trippingarmature adapted to be attracted by the core of said overload coil, a releasing means normally in engagement with said switcharm, and means between said releasing means and the tripping-armature. for actuatingIsaid releasing means.

5. nan overload circuit-breaker, in combination with an overload coil, and a pair of terminal-clamps with which the respective terminals of the ,coil are connected, a magnetic core connected with said overload coil, a switch-arm oscillatorily mounted upon said core, a spring-controlled contact-lever connected with said switch-arm, a contact-tip carried by said switch-arm, a fixed contacttip with which said first-mentioned contacttip is normally in contact, a clamping element carried by said contact-lever, an electrical series-connection between said clamping element and one of said terminal clamps, and a tripping means for releasing said contact-lever and breaking the electrical contact between said contact-tips, consisting of a pivotally mounted tripping armature adapted to be attracted by the core of said overload coil, an auxiliary arm connected with and extending from said switch-arm, a pivotall disposed and spring-controlled bellcran -pawl having one member in engagement with said auxiliary arm, and means between the other member of said pawl and the 1tripping-armature for actuating said paw 6. In an overload circuit-breaker, in combination with an overload coil, and a, pair of terminal clamps 'with which the respective terminals of the coil are connected, a magnetic core'connecte'd with said overload COIl, aswitch-arm oscillatoril mounted upon said core, a spring-control ed contact-lever, a means of pivotal connection between said contact-lever and said switch-arm, a contact- .tip carried by said switch-arm, a fixed contact-tip with which said first-mentioned contact-tip 1s normally in contact, a clamping element carried by said contact-lever, an

electrical series-connection between said clamping element and one of said terminal clamps, and a tripping means for releasing a said contact-lever and breaking the electri cal contact between said contact-tips, consisting of a pivotally mounted trippingarmature adapted to be attracted by the core of said overload coil, an auxiliary arm connected with and extending from said switcharm, a pivotally disposed and spring-controlled bell-crank-pawl having one member in engagement with said auxiliary arm, and means between the other member of said pawl and the tripping-armature for actuating said pawl.

7. In an overload circuit-breaker, in com bination with an overload coil,-and a pair of terminal-clamps with which the respective terminals of the coil are connected, a magnetic core connected with said overload coil, a switch-arm oscillatorily mounted upon said core, a spring-controlled contact-lever connected with said switch-arm, a contact-tip carried by said switch-arm, a fixed contacttip with which said first-mentioned contacttip is normally in contact, a clamping element carried by said contact-lever, an electrical series-connection between said clamping element and one of said terminal clamps, and a tripping means for releasing said contact-lever and breaking the electricalcontact between said contact-tips, consisting of a pivotally mounted tripping-armature adapted to be attracted by the core of said overload coil, an auxiliary arm connected with and extending from said switch-arm, a pivotall disposed and spring-controlled bellcran -pawl having one member in engagement with said auxiliary arm, and means between the other member of said pawl and the tripping-armature for actuating said pawl, comprising a slidable tripping rod, a collar mounted upon said rod for engagement with the last-mentioned member of said pawl, a crank-extension carried by said I tripping-armature, and a means of pivotal connect1on between said crank-extension and said tripping rod.

8. In an overload circuit-breaker, in combination with an overload coil, and a pair of terminal clamps with which the respective terminals of the coil are connected, a magnetic core connected with said overload coil,

a switch-arm oscillatorily mounted upon said core, a spring-controlled contact-lever, a means of pivotal connection between said contact-lever and said switch-arm, a contacttip carried by said switch-arm, a fixed contact-tip with which said first-mentioned contact-tip is normally in contact, a clamping element carried by said contact-lever, an electrical series-connection between said clamping element and one of said terminal clamps,

and a tripping means for releasing said contact-lever and breaking the electrical I contact betweensaid contact-tips, consisting of a pivotally mounted tripping-armature adapted to'be attracted by the core of said overload coil, an auxiliary arm connected with and extending'from said switch-arm, a pivotally disposed and spring controlled bell-crank-pawl having one member in engagement with said auxiliary arm, and means between the other member of said pawl and the tripping-armature for actuating said pawl, comprisin a slidable tripping rod, a collar mounted upon said rod for engagement with the last-mentioned member of said pawl, a crank-extension carried bysaid tripping-armature, and a means of pivotal connection between said crankextension and said tripping rod.

9. In an overload circuit-breaker, in combination with an overload coil, and a pair of terminal clamps with which the respective terminals of the coil are connected, 'a magnetic core connected with said overload coil, a supporting plate having an'opening into and through which a portion of said core projects, a bearing member upon said plate, a perforated lug extending from one of said a bearing members, a rod receiving guidepost also upon said plate, a handle-lever having a hub-portion oscillatorily mounted upon the core-portion above said late, a perforated lug extending from said hubportion, a switch-arm also oscillatorily mounted upon said core-portion, a contactlever, a'means of pivotal connection between said contact-lever and said switch-arm, a contact-tip carried by said switch-arm, a fixed contact-tip with which said first-mentioned contact-tip is normally in contact, a clamping element carried by said contactlever, an electrical series-connection between said clamping element and one of said terminal clamps, a coiled spring attached at one end to said contact-lever and at its other end to the perforated lug extending from one of the bearing-members of said plate, a tripping-armature pivotally mounted between the bearing-members of said plate, an auxiliary arm connected with and extending from said switch-arm, a bell-crank-pawl pivotally mounted upon said plate, a coiled spring attached at one end to the perforated lug of said handle-lever and at its other end with one of the members of said pawl for forcing said member in engagement withsaid trippingarmature for actuating said rod.

10. In an overload circuit-breaker, in combination with an overload coil, and a pair of terminal clamps with which the respective terminals of the coil are connected, a mag netic core connected withsaid overload coil,

a supporting plate having an opening into forated lug extending from said hub-portion, a switch-arm also oscillatorily mounted' upon said core-portion, a contact-lever, a means of pivotal connect1on between said contact-lever and said switch-arm, a contacttip carried by said switch-arm, a fixed contact-tip with which said first-mentioned contact-tip is normally in contact, a clamping element oarried by said contact-lever an electrical series-connection between said clamping element and one of said terminal clamps, a coiled spring attached at one end to said contact-lever and at its other end to the perforated lug extending from one of the bearing-members of said plate, a tripping-armature pivotally mounted between the bearing-members of said plate, an auxiliary arm connected with and extending from said switch-arm, a bell-crank-pawlivotally mounted upon said plate, a coiled spring attached at one end to the perforated lug of said handle-lever and at its other end with one of the members of said pawl for forcing said member in engagement with said auxiliary arm, a tripping rod slidably disposed in the rod-receiving guide-post of said plate, a collar mountedupon said rod for engagement with the other member of said pawl, a crank-extension carried by said tripping-armature, and a means of pivotal having an opening, one of said compartments providing a blow-out chamber, and the end-,

wall. of said casing forming part of said chamber being likewise provided with an opening, combined with a circuit-breaking -mechanism having a portion thereof extending through the opening in said partitionwall, an arcing-box located in said blow-out chamber, said box having open end-portions, one of said end-portions projecting from the opening in said end-wall of the easing, and the said circuit-breaking mechanism being provided with separable contacttips located within said arcing-box.

12. In an overload circuit-breaker, a casing having a partition-wall arranged to provide two compartments, said partition-wall having an opening, one of said compartments providing a blow-out chamber, and

the end-wall of said casing forming art of said chamber being likewise provide with an opening, combined with a circuit-breaking mechanism having a portion extending through the opening in said partition-wall, an arcing-box located in said blow-out chamher, said box having open end-portions,.one

of said end-portions projecting from the 4 lower member having a top providing a base for the upper box-member, said upper boxmember having a partition-wall arranged to provide two compartments, said partitionwall having an opening, one of said compartments providing a blow-out chamber, and the end-wall of said upper box-member forming part of said blow-out chamber being likewise provided with an opening, a magnetic field-element within said lower box-member, and an overload coil mounted upon said field-element, a second magnetic field-member located within the blow-out chamber of said upper box-member, combined with a circuit-breaking mechanism located within said upper box-member having a portion extending through the openin in said partition-wall, and provided wit separable contact-tips located in said blowout chamber. 1

14. In an overload circuit-breaker, a lower box-member and an upper box-member, said lower member having a top providing a base forthe u per box-member, said upper boxmember having a partition-wall arranged to provide two compartments, said partitiom wall having an opening, one of said compartments providing a blow-out chamber, and the end-Wall of said upper box-member forming part of said blow-out chamber being likewise provided with an opening, a magnetic field-element within said lower box-member, and an overload coil mounted upon said field-element, a second magnetic field-member located within the blow-out chamber of said upper box-member, combined with a circuit-breakingmechanism located within said upper box-member having a portion extending through the opening in c said partition-wall, an arcing-box located in said blow-out chamber, said box having open end-portions, one of said end-portionsprojecting from the opening in said end-wall of the upper box-member, and the said circuitbreakin mechanism being provided with separab e contact-tips located within said arcing-box.

15. In an overload circuit-breaker, a lower box-member and an upper box-member, said 'lower member'having a top providing a base cate in said blow-out chamber, and a deflector-element extending from each contacttip toward the opening in the end-wall of said upper box-member.

16. In an overload circuit-breaker, a lower box-member and an upper box-member, said lower member having a top providing a base for the upper box-member, said upper boxmember having a partition-wall arranged to provide two compartments, said partitionwall having an opening, one of said compartments providing a blow-out chamber, and the end-wall of said upper box-member forming part of said blow-out chamber being likewise provided with an opening, a.

magnetic field-element within said lower box-member, and an overload coil mounted upon said field-element, a second magnetic field-member located within the blow-out chamber of said upper box-member, com-.

bined with a circuit-breaking mechanism located within said upper box-member having a portion extending through the opening in said partition-wall, an arcing-box located in said blow-out chamber, said box having open end-portions, one of said end-portions projecting from the opening in said end-wall of the upper box-member, a pair of separable contact-tips located within said arcing-box, and a deflector-element extending from each contact-tip toward the opening in said arcv ing-box. V

In testimony that I claim the invention set forth above I have hereunto set my hand this 13 day of August, 1919.

EDVARD M. MO'IJLER.

Witnesses:

FREDK. C. FRAENTZEL, BARBARA W. SUTIERIJN.

said dpartition-wall, a pair of contact-tips lo-

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