US2311699A - Pole type circuit breaker - Google Patents

Description

2 Sheets-Sheet l A. C. SCHWAGER POLE TYPE CIRCUIT BREAKER Filed May 19, 1941 IN1/E T012. W be.

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Feb. 23, 1943.

Feb. 23, 1943. A C, SCHWAGER I' 2,311,699

POLE 'TYPE CIRCUIT BREAKER Filed May 19, 1941 2 sheets-sheet 2 151154* Fys-5f i INg NTORW rroswey.

Patented Feb. 23, 1943 POLE TYPE CIRCUIT BREAKER August C. Schwager, Millbrae, Calif., assignor to Pacific Electric San Francisco, fornia Manufacturing Corporation, Calif., a corporation of Cali- Application May 19, 1941, Serial No. 394,082

11 Claims.

My present invention relates to oil circuit breakers, and more particularly to a single pole overload responsive circuit breaker for feeder lines that can be mounted in an elevated position upon a pole or cross arm as a substitute for the high capacity expulsion fuses now commonly used for that type of service.

It is an object of the present invention to provide an efficient and inexpensive overload responsive circuit breaker that can be conveniently mounted in an elevated position upon a pole or tower to control a high voltage electric circuit in a safe and convenient manner.

Another object of the invention is to provide a new and novel arrangement in which the circuit controlling contacts and the line terminals of a circuit breaker are supported and insulated from each other and from an operating mechanism with a single insulator.

Another object of the invention is to provide a new and novel insulating means for the circuit controlling elements of a circuit breaker in which the operating mechanism, operating at ground potential, and the line terminals of the circuit breaker are insulated from each other with a single oil filled porcelain insulator.

A further object of the invention is to provide a new and novel type of circuit breaker in which the live circuit controlling parts thereof are insulated from an operating mechanism at ground potential by means of a single porcelain bushing and in such a manner that the bushing will not be subjected to radial electrical stresses.

Another object of the invention is to provide a new and novel arrangement wherein a single oil filled bushing type insulator is adapted to completely enclose and insulate the live circuit controlling elements of the circuit breaker and also carry suitable terminals to which the conductors of a power line may be connected.

Another object of the invention is to provide a simple and effective operating mechanism and overload trip means for a single pole circuit breaker in which the live contacts of the circuit breaker and the overload responsive trip coil are submerged in an insulating iiuid and insulated from the operating mechanism by a single bushing type insulator.

In the manufacture of oil circuit breakers of a type suitable for the service contemplated by the present invention, it is now generally the practice to enclose the circuit controlling contacts of the circuit breaker in a metallic tank that is secured to the under side of a suitable supporting housing which encloses the circuit breaker operating mechanism. With this type of circuit breaker, the power line connections are brought in through two spaced insulating bushings, generally of porcelain, which are mounted upon and extend through the top of the supporting housing. Under these conditions the insulating bushings are subjected to a considerable electrical stress at the point where they pass through the metallic wall of their supporting structure, and because of this electrical stress, which is in a radial direction, it is necessary that the porcelain of the bushings be of the highest quality. Therefore, in addition to the necessity for two bushing type insulators, these prior art circuit breakers also require the use of insulators which are quite expensive. It is known that the most frequent breakdown in insulators of this character occurs at the point where they are subjected to the above radially applied electrical stress. Whereas, these insulating bushings, even when of a poor quality, will stand many times the same electrical stress when applied axially as a creepage stress. It is, therefore, a further object of the invention to provide a new and novel circuit breaker construction in which the line terminals are insulated from each other and from the operating mechanism and its enclosing housing in a new and novel manner by a single bushing type insulator and in which the insulating bushing is not subjected to a radially applied electrical stress.

Other objects and advantages of the invention will be in part evident to those skilled in the art and in part pointed out hereinafter in connection with the accompanying drawings, wherein there is shown by way of illustration and not of limitation preferred embodiments thereof.

In the drawings;

Figure 1 is an external side view showing a circuit breaker constructed in accordance with the present invention as mounted upon the cross arm of a power line supporting pole,

Figure 2 is a view similar to Figure 1 showing i a modied form of the invention,

Figure 3 is a vertical sectional view taken longitudinally through a circuit breaker constructed in accordance with a preferred embodiment of the invention and with the operating mechanism in its closed circuit position,

Figure 4 is a fragmentary view showing the operating mechanism in its open circuit position,

Figure 5 is a fragmentary plan view showing the operating mechanism of the circuit breaker,

Figure 6 is a fragmentary plan view of the trip lever taken along line VI-VI of Figure 3,

Figure 7 is a fragmentary side view taken along line VII- VII of Figure 3 looking in direction of arrows,

Figure 8 is a fragmentary plan view showing the upper circuit breaker contact, and

Figure 9 is a fragmentary view showing a manual latch tripping arrangement.

For the purpose of describing my invention, I have illustrated in the drawings a modification thereof that is particularly adapted for use in an A elevated position, as upon a pole or transmission line tower, where it may be used instead of dropout fuses and other fusible cutouts, such as are now generally used to protect against short circuits and overloads. This device has the advantage over fusible cutouts in that, upon an overload or short circuit, it will interrupt the circuit without throwing any sparks or dropping fused parts to the ground below, and further, it will be possible to again restore the circuit by a simple reclosing thereof without the replacement of vany parts, such, for example, as the fusible link provided with fusible cutouts.

' As shown in Figure 1 of the drawings, the device comprises a metallic supporting housing Iii that is adapted to be secured upon a cross arm I I or other suitable support by means of a clamping bracket i2. The housing IB, as will hereinafter appear, carries an operating mechanism, and disposed over this operating mechanism, there is a cover I3. Depending downwardly from the housing Il! there is an oil containing receptacle il! of insulating material in which cooperating circuit interrupting contacts are disposed. Ihisoil containing receptacle I4 is preferably in the form of a cylindrical porcelain bushing and at its side it is provided with an outwardly extending terminal stud I to which one lead of the power line is connected. At its bottom, the receptacle le carries a second terminal stud IS to which the other lead of the power line is connected. In this gure of the drawings it will be noted that the metallic housing I@ is provided with a sight opening I1 through which an oil l level indicator may be viewed, and at its side the housing I@ valso supports an exposed operating lever I8 by means of which the operating mechanismwithin the housing IEB may be actuated. This operating lever i8 is provided with an enlarged ring-like end I9 into which a hook at the end of a conventional switch operating pole may be inserted.

In Figure 2 of the drawings there is shown a modication of the invention in which the oil containing receptacle It, in the form of a porcelain bushing, is shown as closed at its bottom end and as having the terminal studs l5 and AIt mounted intermediate its ends and in diametrically opposed relation to each other. this modification of the invention, except for the changes that will be required due to the relocation of the terminal stud I6, the construction will be substantially identical with that to be hereinafter described.

Reference is now made to Figure 3 of the drawings for a more detailed description of the invention. In this figure of the drawings it will be noted that the metallic housing lil is of a basin-like configuration and is open at its bottom. Supported by the housing lil and depending downwardly therefrom, there are two insulating supports 2li which may be in the formV of rods or tubes of fibre or like material. Upon the lower end of the supports 2@ there is mounted a lowerstationary contact 2l, and intermediate In.l

their ends there is secured a supporting frame 22 that carries a second or upper stationary contact 23. rThe supporting frame 22 is here shown as having outwardly extending flanges between which an overload trip coil 2li is mounted and they provide a magnetic frame in which a vertically movable armature 25 is adapted to move. The lower stationary contact 2l is shown as enclosed in an arc extinguishing chamber 2% of conventional design. Extending outwardly from the bottom of the arc extinguishing chamber 26 and in connection with the stationary contact 2l, there is a bowed flexible circuit completing member 2! that is adapted to engage with an enlarged head 2S formed upon the inner end of the terminal stud It. Likewise, the supporting frame 22 also carries an outwardly extending bowed flexible circuit completing member 2 that is Y adapted to engage an enlarged head e@ upon the terminal stud l5. The fixed end of the circuit completing member 29 is connected to one terminal of the overload trip coil 2li and the other terminal of the trip coil 2li is connected to the supporting frame 22 which is in contact with and carries the upper stationary contact Z3. Cooperating with the stationary contacts 2i and 23 there is a vertically movable bridging member 3l that is adapted to complete a circuit therebetween. In this way, when the bridging member SI is in the position shown, a circuit will be completed from the terminal stud l5 via the circuit completing member 2S, through the trip coil 24 to the stationary upper contact 23, then through the vertically movable bridging member SI to the lower stationary contact 2l and out through the circuit completing member 2l to the other terminal stud Iii. From this it will be seen that all of the live parts of the circuit breaker will be immersed in the oil or other insulating fluid, designated by the numeral 32, carried by the oil containing receptacle lil and also insulatedvfrom the operating mechanism within the housing It. The bridging member Si is here shown as secured to the lower end of a downwardly extending operating rod or tube 33 which may be of bre or other insulating material. The operating rod 33 is shown as connected at its upper end to a split lever 3d that is pivotally secured upon a iioating fulcrum 35 wln'ch is carried by a transversely extending shaft 35. The split lever 5d is shown as oifset at its free end where it connects with the operating rod 33 and intermediate its ends it is connected to a bell crank lever Si by means of which it is moved to produce a substantially straight line movement of the operating rod 33. The bell crank lever Si is pivotally mounted upon a transversely extending shaft 33 and it has a downwar ly extending arm 3d. Connected between the downwardly extending arm SS of the bell crank lever 3l and a lever it which is secured to the shaft 3S, there is a pair of cooperating toggle links 4I and #i2 that are adapted to be held in fixed and operative relation with each other by means of a latch i3 that is pivotally mounted upon the downwardly extending arm 35. Mounted adjacent the transversely extending shaft 38, the housing lil carries two bowed springs Il and d5 that are adapted to operate upon the bell crank lever 3l and move it in a clockwise direction when the connection formed by the toggle links Si and l2 is collapsed by an operation of the latch 53. The latch @3 has a downwardly and inwardly disposed end 'it with which a tripping lever l is adapted to engage, and as here shown, the tripping lever il is biased into an inoperative position by a coiled spring 48. The armature 25 of the overload trip coil 24 is also shown as connected to the tripping lever 41 by means of an insulating rod or tube 49. With the toggle forming links 4| and 42 arranged and secured in the position here shown, it will be seen that when the latch 43 is rotated clocl wise by an actuation of the tripping lever 41, it will release the end of the link 4|, with which it cooperates, and permit the toggle formed by the links 4| and 42 to collapse. This will permit the springs 44 and 45 to rotate the bell crank lever 31 upwardly and cause the split lever 34 to rotate about its floating fulcrum 35 in a counter-clockwise direction and thus, through the operating rod 33, carry the Contact bridging member 3| out of contact making engagement with the lower stationary Contact 2| and clear of the arc extinguishing housing 26 to thus open the circuit between the terminal studs and I6 of the circuit breaker.

By referring now to Figure 4 oi the drawings, it will be seen that when this collapse of the toggle formed by the links 4| and 42 occurs, the lever 40 carried by the shaft 35 will not move, but will remain in the position illustrated in Figure 3. Now, if it is desired to again close the circuit breaker by moving the bridging member 3| downwardly and into circuit making engagement with the lower stationary contact 2|, this can be done by operating the lever IS, previously referred to in connection with Figure 1 of the drawings, upwardly. This will rotate the shaft 33 and thus carry the lever 43 into its upper position, indicated by dot and dash lines, where the toggle formed by the links 4| and 42 will be again locked in an extended and cooperating relation with each other by means of the latch 43, as will be clearly understood. rIhen, by a downward movement of the lever i3 by means of an operating pole, as previously described, the lever 40 can be again moved downwardly and through the extended toggle forming links 4| and 42, cause the bell crank lever 31 to rotate in a counterclockwise direction against the action of the springs 44 and 45 to again carry the lever 34 in a downward direction to thus cause the operating rod 33 to move the bridging member 3| into circuit forming engagement with the lower stationary contact 2|. Should it now happen that the abnormal condition is still in existence upon the power line at the time of such a reclosing of the circuit breaker, it will be readily seen that the overload trip coil 24 will again operate upon its armature 25 as soon as the circuit is reestablished and, as a result, the tripping lever 41 will operate upon the latch 43 and thus again collapse the toggle formed by the links 4| and 42 and permit the bell crank lever 31, under the influence of the springs 44 and 45, to move the split lever 34 upwardly and thus again open the circuit in a trip free manner with respect to the operating levers |8 and 4|] that are secured upon the shaft 36.

Upon referring to Figure 5 of the drawings, it will be seen that the downwardly extending insulating supports 20 are secured in parallel spaced relation upon anges 50 that extend into the opening formed in the bottom of the metallic housing Il). These flanges 50 carry upstanding cylindrical bosses in which the upper ends oi the supporting rods or tubes 20 are secured, either by a pin or by threading. As here shown, it will also be noted that the split lever 34 and the bell crank lever 31 arev mounted upon their respective 75 shafts '36 and 38 so that they will operate in the central plane of the housing l0, and that the toggle operating lever 4U and the toggle links 4| and 42 are located to operate in a plane at one side of the levers 34 and 31. It will also be noted that the shaft 3B is extended outwardly from the housing |0 through a supporting boss 5| so that the operating lever I8 may be convenieintly engaged by an operating pole.

In Figure 6 of the drawings the tripping lever 41 is shown as of a special construction that will permit its operation without interference with the free upward and dovmward movement of the operating rod 33 which controls the movement of the bridging member 3i. The tripping level 41 is also here illustrated as pivotally mounted upon a bracket 52 that is secured to the bottom of the housing I0.

Reference is now made to Figures "I and 8 of the drawings for a description of the manner in which the upper contact 23 and the trip coil 24 are mounted upon the downwardly extending insulating supports 20. As here shown, the supporting frame 22 has outwardly extending portions 52' formed upon its upper and lower flanges through which the vertically disposed insulating supports 20 extend, and located between these flanges, the supporting frame 22 is also provided with two outwardly extending oppositely disposed ears 53 that are adapted to be secured to the insulating supports 20 to thus hold the supporting frame 22 in a xed position. At this point it will also be noted that the flexible circuit completing member 29 is cut out or forked at its secured end to provide a clearance through which the operating rod 33 that carries the bridging member 3| may move. Below the outwardly extending ears 53 the supporting frame 22 also carries two oppositely extending and outwardly disposed supporting arms 54 between which, as is more clearly shown like members 55, that form the lower contact 23, are mounted. These spring-like members 55 may be of bronze or other resilient conducting metal and they are preferably shaped at their centers so as to provide a good contact and also permit a free sliding movement of the bridging member 3| therebetween.

In Figure 9 of the drawings I have illustrated a means by which the circuit controlling contacts described above may be actuated manually, as where it may be desired to open the circuit breaker under normal operating conditions. For this purpose I provide a normally inactive latch 56 which is pivoted upon a iixed supporting shaft 51 that is carried by the housing I0. As here shown, the latch 56 has a downwardly depending end 58 that engages an abutment 59 which serves to hold the latch 56 in a position where it will cooperate with the upwardly extending end of the latch 43. With this arrangement, assuming the circuit breaker contacts are closed and that the operating lever 40 and the toggle forming links 4| and 42 are in their extended position, as shown in Figure 3 of the drawings, it will be seen that upon an upward operation of the lever 8 the links 4| and 42 and the latch 43 will be moved to the left and thus the upper extending end of the latch 43 will be brought into engagement with one of a series of overhanging teeth 60 upon the latch 56. When this occurs, the latch 43 will be held against further movement to the left and consequently it will rotate upon its supporting shaft relative to the link 42 and thus disengage the latched in Figure 8, two spring-v cooperating end of the toggle forming link 4l. This will permit the toggle formed by the links 4l and 42 `to vimmediately collapse and the springs 44 and 45 will then be free to operate the circuit breaker with a quick opening action independently of the operating levers I8 and 4D. The importance of this additional feature is that it prevents a slow circuit opening movement of the bridging member 3|, such as might occur if the entire opening of the circuit breaker were controlied by an operating pole, and thus avoids a burning of the contacts and the generation of high explosive pressures within the arc extinguishing chamber 25.

While I have, for the sake of clearness and in order to disclose the invention so that the same can be readily understood, described and illustrated specic devices and arrangements, I desire to have it understood that this invention is not limited to the specific means disclosed, but may be embodied in other ways that will suggest themselves to persons skilled in the art. It is believed that this invention is new and all such changes as come within the scope of the appended claims are to be considered as part of this invention.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

l. In a pole type circuit breaker, the combination of an enclosing housing adapted to be secured upon an elevated structure, an insulating support extending downwardly from said housing, a spaced contacts mounted upon insulating support, a bridging member movable with respect to said contacts to establish and interrupt a circuit therebetween, means carried by said housing for operating said bridging member, a container of insulating material secured to said housing and enclosing said spaced contacts and said bridging member, a pair oi line terminals mounted in spaced relation in the wall of said container and having an exposed Contact surface at their inner ends, and cooperating connector forming means extending outwardly from eachof said spaced contacts engageable with the exposed contact surface of an adjacent line terminal, whereby a circuit including said contacts and said bridging member will be established between said line terminals when said` insulating container is secured in position upon said enclosing housing.

2. In a pole type circuit breaker, the combination an enclosing housing adapted to be secured upon 'an elevated structure, an insulating supportJ extending downwardly from said houspair or spaced contacts mounted upon said og support, a bridgingV member movable wit respect to said contacts to establish and interrupt a circuit therebetween, means carried by said housing for operating said bridging member, a hollow porcelain insulator suspended from said housing and enclosing said spaced contacts and id bridging member, said porcelain insulator open at the top and closed at the bottom and adapted to carry an insulating oil in which said contacts and said bridging mein-ber are immersed, a pair of line terminals mounted n'spaccd relation in the wall ofsaid insulator having an exposed contact surface at inner ends, and cooperating connector for ng means extending outwardly from each of Ysaid spaced contacts and engageable with the exposed contact surface of an adjacent line termina), whereby a vcircuit including said contacts and said bridging member will be established between said line terminals when said insulator is secured in position upon said enclosing housing.

3. In a pole type circuit breaker, the combination of a pair of stationary contacts mounted in spaced insulated relation to each other, a bridging member for establishing a circuit between said contacts, a receptacle of insulating material surrounding said stationary contacts and said bridging member and containing oil in which said contacts and said bridging member are immersed, a pair of spaced line terminals extending through the wall of said receptacle at spaced points having enlarged contact forming heads exposed within said receptacle, and current conducting members extending from said stationary contacts adapted to engage the contact forming heads oi said spaced line terminais, whereby a circuit will be withheld between said stationary contacts and said spaced line terminals when said receptacle is positioned to enclose said stationary contacts.

1i. in a pele type circuit breaker, the combination oi a metallic housing adapted to be secured upon an elevated structure, a downwardly extending support oi insulating material carried by said housing, a pair of spaced stationary contacts mounted upon said insulating support, a bridging member movable with respect to said spaced1 sta' 'onary contacts for opening and ciosing a cir.. clot between said contacts, an operating mechanism ior moving said bridging member carried by said metallic housing and having insulated operating connection with said bridging member, a receptacle of insulating mate 1iai adapted to stationary contacts and bridgr and carry an arc extinguishing fluid id contacts are immersed, and a pair of line t Ainal forming members extending through the wall or said receptacle at spaced points and each a connection with an adjacent stationary contact, whe eby said line terminals will be insulated from each other and fr; n said metallic housing by said receptacle of suiating material.

5. In a pcie type circuit breaker, the combination a rn tallic housing adapted to be secured upon an elevated structure, a downwardly extending `support of insulating material carried by said housing, a pair oi' axially spaced stationary contacts mounted upon said insulating support one above the other, a vertically movable bridging member for establishing a crcuit between said contacts, an operating mechanism carried by said metallic housing having an insulated operating connection for moving said bridging member, a single hollow insulator adapted to enclose said stationary contacts and said bridging meniber and carry an arc extinguishing fluid in which said contacts are immersed, and a pair of line terr Enal forming members extending through the wall of said insulator at spaced points and having connections with said stationary contacts, whereby said line terminal forming members will be from each other and from said housing operating mechanism by said single hollow insulator.

l In a pole type circuit breaker, the combination or a metallic housing adapted to be secured upon a pole or cross arm, an operating mechanisrn mounted within said metallic housing, a downwardly extending insulating support having a stationary contact intermediate its ends and a second stationary contact at its extreme lower end, an overload trip coil mounted upon said insulating support adjacent said rst contact and having one of its terminals connected thereto, a exible outwardly extending current conducting member xed upon said insulating support to which the other end of said overload trip coil is connected, a second exible current conducting member connected to and extending outwardly from said second contact, a contact bridging member controlled by the operating mechanism mounted within said metallic housing for establishing a circuit between said contacts, an enclosing receptacle of insulating material secured at its upper end to said metallic housing and in which said insulating support and Said stationary contacts are disposed, and line terminals mounted in spaced relation upon and extending through the wall of said enclosing receptacle and engageable with a corresponding one of said iiexible outwardly extending current conducting members, whereby a circuit including said stationary contacts said contact bridging member and said overload trip coil will be established between said line terminals when said enclosing receptacle is secured in position upon said metallic housing.

7. In a pole type circuit breaker, the combination of a metallic housing adapted to be secured upon a pole or cross arm, an operating mechanism mounted within said metallic housing, a downwardly extending insulating support having a stationary contact intermediate its ends and a second stationary contact at its extreme lower end, an overload trip coil mounted upon said insulating support adjacent one of said contacts and having one of its terminals connected thereto, a ilexible outwardly extending current conducting member iixed upon said insulating sup'- port to which the other end of said overload trip coil is connected, a second flexible current conducting member connected to and extending outwardly from the other of said contacts, a contact bridging member controlled by the operating mechanism mounted within said metallic housing for establishing a circuit between said contacts, a substantially cylindrical insulator ha ing its upper end open and secured to said metallic housing into which said insulating support and said stationary contacts are disposed, the lower end of said insulator being closed, an insulating iiuid carried to said insulator into which said stationary contacts said trip coil and said bridging member are immersed, and line terminals mounted in spaced relation upon and extending through the wall of said enclosing receptacle and engageable with a corresponding one of said flexible outwardly extending current conducting members, whereby a circuit which will include said stationary contacts said contact bridging member and Said overload trip coil will be established below the surface of said insulating iiuid and between said line terminals when said enclosing receptacle is secured in position upon said metallic housing.

8. In a pole type circuit breaker, the combination of a metallic housing enclosing an operating mechanism and supporting a pair of cooperating circuit controlling contacts in insulated relation therebelow, an insulating receptacle of porcelain adapted to contain an insulating fluid and be suspended from Said metallic housing and surround said cooperating contacts, a line terminal extending through the side of said insulating receptacle intermediate its ends, a second line terminal mounted in and extending through the bottom of said insulating receptacle, and means forming a connection between said line terminals and a corresponding one of said circuit controlling contacts, whereby said line terminals will be insulated from each other and from said metallic housing by said insulating receptacle.

In a totally enclosed oil immersed circuit breaker, the combination of a metallic housing adapted to enclose an operating mechanism, said metallic housing having an open bottom through which insulated contact operating members extend, a support of insulating material carriedv by said metallic housing also extending downwardly through the bottom thereof, cooperating circuit controlling contacts mounted in spaced relation upon said support of insulating material and adapted to be operated to open and close a circuit by the operating mechanism in said metallic housing, an overload trip coil mounted upon said insulating support adjacent `one of said contacts and connected at one end thereto, a substantially cylindrical closed bottom insulator of ceramic material having terminals mounted thereupon in spaced relation at points corresponding to the location of said cooperating contacts, means for securing said insulator with its open end in register with the open bottom of said metallic housing, and means for connecting said cooperating contacts with said terminals when said insulator is secured upon said metallic housing, whereby the entire circuit breaker mechanism will be completely enclosed.

10. In an overload responsive circuit breaker of the character described, the combination of a metallic housing having an open bottom and adapted to be mounted in an elevated position, a support of insulating material carried by and extending downwardly through the bottom of said metallic housing, a stationary contact mounted upon the lower end of said support, a second stationary contact secured upon said support in spaced relation above said first contact, a vertically movable current conducting member adapted to establish a connection between said stationary contacts, a manually controlled lever mechanism within said housing having an insulated connection with said vertically movable current conducting member for moving it into circuit establishing relation With said stationary contacts, spring means adapted to operate said lever mechanism in a reverse direction to move said current conducting inember out of circuit establishing relation with said stationary contacts, a trippable latch for holding said lever mechanism against the action of said spring means, an overload trip coil mounted upon said insulating support having one terminal connected to the upper one of said stationary contacts, an insulated mechanical connection between said overload trip coil and said trippable latch, a substantially cylindrical porcelain insulator having an open upper end and a closed bottom adapted to contain an insulating fluid, means for securing said insulator with its open end in register with the open bottom of said metallic housing, a pair of line terminals mounted in spaced relation upon said insulator, an outwardly extending conductor connected to the other terminal of said trip coil and engageable with one of said line terminals, a second outwardly extending conductor carried by said irst stationary contact adapted to engage the other one of said line terminals, whereby said stationary contacts said current conducting member and said overload trip coil will be operatively immersed in said insulating fluid when said insulator is secured upon said metallic housing.

11. 'In an overload responsive circuit breaker of the character described, the .combination of a metallic support, adapted :to `be mounted in an elevated position, a centrally disposed downwardly extending support of insulating material, a stationary contact secured at the lower `end of said support, a second stationary contact secured upon said support in spaced and aligned relation with said rst contact, a vertically movable current conducting member adapted to establish a connection between said stationary contacts, a manually controlled lever mechanism 4having an insulated connection with said vertically movable current conducting member for .moving it into circuit establishing relation between said stationary contacts, lspring means .adapted to operate said lever mechanism in a reverse direction to move said currentl conducting member out of circuit making engagement between said stationary contacts, a trippable latch for holding said lever mechanism against the action of said spring means, an overload trip coil mounted upon said insulating support and having one terminal connected to the upper one of said stationary contacts, an insulated mechanical connection between said overload trip coil for operating said trippable latch, a substanducting member and said overload trip coil are immersed, said insulator having a terminal contact mounted in the side thereof adjacent the upper one of said stationary contacts, a second terminal Contact extending through the closed end of said insulator adjacent the rst of said stationary contacts, an outwardly extending exible conducting member carried by said insulating support and connected to the other terminal of said overload trip coil and adapted to establish a connection with said first terminal contact when said insulator is secured upon said support, a second outwardly extending flexible conducting member connected to said rst stationary contact and engaging said second ter- .minal contact, and means for securing said insulator in `suspended relation upon said support, whereby said stationary contact said current conducting member and said overload trip coil will be operatively immersed in said insulating fluid and insulated from said metallic support by said insulator.

AUGUST C. SCHWAGER.

CERTIFICATE OF CORRECTION. Patent No. 2,511,699. February 25, l9l5 AUGUST C. SCHWAGER.

It is hereby certi fied that error appears in the printed specification of' the above numbered patent requiring correction as follows: Page b., seoond column, line 19, claim 5, for the word "withheld" read establ1shed;

and that the said Letters -Patent shouldbe reaciwith this correction therein that the same may conform to the record of the oase in the Patent Office.

Signed and sealed this 20th day of July, A. D.' l9h5.

Henry Van Arsdale, (Seal) Acting Commissioner of Patents.

CERTIFICATE or CORRECTION. Patent No. 2, 511,699. February 25, 19kg.

AUGUST C. scHwAGER.

' It is hereby Certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page L, second column, line 19, claim, for the word "withheld" read --established;

and that the said Letters .Patent shouldbe read'wth this correction therein that the same may conform to the record of the case in the Patent Office.

signed and sealed this zoen day of July, A. D. 19115. Y

Henry Van Arsdale,

(Seal) Y Acting Commissioner of Patents.

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