US2390735A - Circuit breaker operating mechanism - Google Patents

Description

Dec. 11,1945. J POKQRNY I 2,390,735

CIRCUIT BREAKER OPERATING MECHANISM Filed June 10, 1940 7 Sheets-Sheet l INVEN'I'OR.

ATTORNEY Dec. 11, 1945. f F. J. POKORNY 2,390,735

CIRCUIT BREAKER OPERATING MECHANISM I Filed June 10, 1940 7 Sheets-Sheet 2 1945- F. J. POKORNY 2,390,735

CIRCUIT BREAKER OPERATING MECHANISM ATTORNEY Dec. 11, 1945. F. J. POKORNY 2,390,735

CIRCUIT BREAKER OPERATING MECHANISM Filed June 10, 1940 7 Sheet s-Sheet 4 3 do m ATTORNEY Dec. H, 2945. F. J. PQKQRMY CIRCUIT BREA-IER OPERATING MECHANISM Filed June 10, 1940 TsheeLs-fiheet 5 FIGJ I.

INVENI'OR. M W

ATTORNEY Dec. l1,' 1945. F. J. POKORNY CIRCUIT BREAKER OPERATING MECHANISM Filed June 10, 1940 'T Sheets-Sheet 6 FIGJZ.

rINVENTOR. BY M 4M ATTORNEY Dec. 11, 1945. F. J. POKORNY CIRCUIT BREAKER OPERATING MECHANISM Filed June 10, 1940 'T Sheets-Sheet 7 FIGJS FIGJ4.

F'IGJG.

IN VENT OR.

ATTORNEY process ottrlppins the contacts op n Patented Dec. 11, 1945 UNITED STATES PATENT JOFFICE CIRCUIT BREAKER OPERATING MECHANISM Frank J. Pokorny, Philadelphia, Pa, assignor to I. T. E. Circuit Breaker Company, Philadelphia, Pa., a corporation of Pennsylvania Application June 10, 1940, Serial No. 339,682

12 Claims.

ping andclosing of the contact members has long been recognized and has been employed in various combinations with difierent types of latching and tripping arrangements;

An important element of the present inven- 10 tion is to provide in connection with a toggle closing mechanism novel means whereby the movable contacts may be operated either manually or'electrically in order to effect the closing operation;

andcorrespondingly novel means whereby either 15 a manual operation or an automatic electrically induced operation may selectively efiect the tripping or the mechanism and the fast opening of the contacts.

An important element of toggle mechanisms is 20 the latch or other engaging means which holds the same in predetermined locked position and which should be so designed as to obviate slipping during closing or any response to the jar of the solenoid or any other vibration, while at 2,5

the same time being so constructed that a relatively small amount of work is required for tripping. a

In the present invention the problem is solved not by the use of a single latch or trip alone but by a combination of latches: primarily by what we have termed a primary latch held in position by a secondary latch and engaging as well the tip of a latch lever. This apparent multipliautomatically reset immediately after the tripping operation is completed.

It thus becomes important that the cooperation between the two latches in the first instance and between the primary latch and the latch lever be such that some movement of a portion of" 1 the toggle mechanism relative to these members have a resultant force efiective to reengage these members while at the same time in no way impeding the tripp operation.

Accordingly, a further important object of the invention is the provision of means whereby relatively slight motions result in the initiation of the tripping operation and whereby the tripping operation itself results in the resetting of the engaging means or latches.

a further object of this invention is to m vide primarily in connection with the tog closing mechanism aback-up trlpwhichwili serve automatically to trip the circuit breaker open as soon as any even slight reverse movement occurs during the closing operation.

There are man other objects and uses of the present invention and of the combinations and elements herein set forth. Many of them have already been pointed out. Many others will in part be app lit and where not intrinsicallyparent will be pointed out in the following description and drawings, in which:

Figure 1 is a side elevation of the circuit breaker of my invention.

Figure 2 is a. front view of the circuit breaker arrangement of Figure 1.

Figure 3 is a top view or the toggle mechanism cation of latches does not, as .might at first be as for closing and op i t circuit breakersuspected, increase the complexity of the mechanism but rather simplifies the operation and makes it possible to provide for an automatic resetting of the latches immediately after the actual tripping operation. In thereafter reclosing the circuit breaker the only Operation necessary is the actual movement of the contact by the toggle means herein described.

An object of this invention,-therefore, is, in a circuit breaker clonng mechanism of the toggle type, the provision of a primary latch for engaging a suitable latch lever of the toggle mechanism and a secondary latch for maintaining the primary latch in latching position.

A second and equally important object of the 50 present invention is the novel arrangement of the latch lever, the primary latch and the secondary latch in such a manner that the vary sets e Figure 4 is a horizontal cross-sectional view taken on line 4-1-4 of Figure! showing the arrangement of the parts of the members of Figure 3 at different horizontal level within the toggle 4o mechanism container.

Figure 5 is a. arm-sectional view partly in elevation taken on line 55 of Figure 6.

-Figure 6 is a cross-sectional view partly in elevation taken on line llll of Figure 3 showing 45 the pofltion Of the members when the contacts are open.

Figure'lcorrespondstol 'igurefibutshowsthe position of the members when the contacts are closed.

Flgure8correspondsto1 'lgure5andisacmss-' vsectional viewonlineHofFlgm'e'Lalsoshowingaposltionofthemembersduringaelodng o tion.

Flguresisaeross-sectlonalviewonlineH membersinsuchpositionthatthe latchesare floii 'igurefi,

Figure 10 is a schematicview in perspective of the toggle and latch mechanisms of Figures 3, d, 6 and 7 when the contacts are closed.

Figure 11 is a schematic view in perspective corresponding to the construction of Figure 10 but showing the toggle mechanisms during one instant of the tripping operation.

Figures 12 and 13 are schematic views in perspective showing the back-up tr'lp mechanism and manual trip mechanisms and the combina= tion thereof with the latching mechanisms of M cm supporting members The main bracket or housing to which supports the operating members is secured to the panel 2% by means of screws 25, 26 the heads of which are recessed in openings 2t, 26 in the back of the panel 23 and which pass through the perforations 2?, 2? in said bracket 26 (Figurel).

As seen in Figures 1 and 2, the main bracket or housing preferably comprises two flanged side plates 28 and is which extend on each side of a horizontal shelf to to which they are welded. The operating mechanism 3i comprising the tog gles and other elements hereinafter described in housing 305 is bolted to the lower side of the shelf 38.

Linlr 3 3 (Figure 7) connects the operating mechanism 3i to the lever, which is secured to the movable contact shaft to and is rotatable therewith. The movable contacts are operated into engagement with the stationary contacts on panel 23 when link 34 is raised and are biased toward open position by appropriate springs connected to contact shaft 35.

A bridge 3? of insulating material secured to the outer end of the main bracket 24 supports the outer end of the arc chutes ace.

Steel contact shaft 45 carries an arm 22c and 225 at each end. These arms carry studs, one of which, on each side, is connected to a contact opening spring which biases the shaft to open position. Another stud from one of the arms 220 may be connected to operate the vertical shaft 236 which operates auxiliary switch 23$.

The rotation of the contact shaft towards opening position will through the arm 22!] and the stud 223 force the vertical link up downwardly. The verticallink 230 is connected by pin 23! to the crank 232 on the shaft 233 of the switch 234. The downward motion of the vertical link 230 will result in rotation of the crank 232 and will therefore result in rotation of the shaft 233 and in the consequent operation of the various contacts and other portions of the switch suitably connected to and actuated by shaft 233.

Such switch 234 may be used where, for instance, the circuit'breaker is to be connected with automatic reclosing circuits when it is open.

and such relay will obviously be reset to its original position when the solenoid or manual closing mechanism hereinafter described rotates t e panel to engage the main aeleoyso contact shaft 86 towards closing position thus raising the insulated link 230 and operating the switch. k i

As has been above pointed out, preferably three contact arms 56 are mounted on this shaft, one r for each pole of the circuit breaker as seen in Figure 2. On each side of each arm, there is cemented to the shaft insulation a Bakelite washer M3 which improves the pole to pole and pole to ground insulation.

As will be noted in Figure 2, the inter-pole washers are bevelled and flanged so that the bevelled and flanged portions Md thereof are spaced cooperation with the arcing contacts and blow apart so that an inter-phase barrier M5 secured to the panel may extend between them. The cooperation of these parts makes it impossible for any flexible conductors of adjacent poles to be drawn together during heavy current flow while at the same time any possibility of arcing over is obviated.

An important feature of the present invention is that the same structure may be used for sinale pole or multi-pole operation, that is, as seen for instance in the structure of Figure 2, the circuit breaker mechanism is so arranged that three poles are simultaneously operated by a single closing and tripping mechanism. The same type of structure may be so arranged as to talze one, two or four poles or more.

The construction and operation of the are chute E50 and arc extinguishing plates 65% in out means are describedin Patent No. 2,338,715.

Operating mechanism (closing and tripping) An extremely important element of the present invention and of the combination herein set forth is the operating and tripping mechanism til (Figure 1). The elements of this operating and tripping mechanism are more clearly set forth in Figures 3 through 13, inclusive. The entire mechanism 3! itself, however, is contained within the housing 300 which is a steel box closedon the front, bottom and sides with flanges 32. at the upper edges of the sides so that it maybe secured by the bolts 33 to the shelf 30 of the housing bracket assembly. The side walls of the housing 300 are pierced for the main stationary ruined the mechanism and the metal around the holes is extruded inwardly and reamed to obtain proper bearing for the pins.

Referring now more specifically to Figures 6 and 7, 10 and 11, the link 34 in each of these figures is the member which engages the actuating arm 35 of the contact shaft 45,

Figure 6 shows the position of each of the members of the operating and tripping mechanism when the circuit breaker is opened. Figures' 7 and 10 show the position of each of the members when the contacts of the circuit breaker member to the drawings of Figures 6, '7, 10 and 11, while also the top view of Figure 3 and the horizontal cross sectional view of Figure 4 will aid in the understanding of the various p rations.

In further aid of the following description, the diagrams off-Figures 14 to 17 should be'referred to. Figure 14 shows the closed position corresponding to Figures 7 and 10; Figure lfi'shows the plate 4M the link 40!.

open position corresponding to Figure 6; Figure shows the position at tripping and immediately before latch re-setting, corresponding to Figure 11; and Figure 17 is a diagrammatic illustration of the trip-free position in the case of operation of the latches while the manual or solenoid closing member is in engagement.

The operating mechanism comprises a plurality of toggles so arranged that the knee pins or knuckle pins of each may be supported when the contacts are closed; but wherein the supports may be removed, permitting the contacts to open when the tripping operation is effected.

One of the toggles comprises an operating link 4" preferably, and for structural reasons, formed from two side plates I and 402, and a tie plate 403 extending between them for rigidifying purposes. The operating link 400 is rotatably mounted on the fixed pivot 404 which is rotatably carried in the perforations of the metal side walls of the outer casing.

The operating link 400 carries rotatably mounted therein between the side plates 4M and 402,

the knee or knuckle pin 405.

Link 406 comprising also a pair of side plates 401 and 400 and a tie plate 40! for rigidif-ying purposes is rotatably mounted at one end thereof on the knee or knuckle pin 405.

The link 406 carries at the opposite end there of the pin 4l0 which is rotatably mounted therein between the side plates 401-400 thereof. Pin 0 carries rotatably mounted thereon a lug 4 providing a means for securing one end or the tension spring 2 thereto. The opposite-end of tension spring 2 is secured to a 1 8' 4l3 which is rotatably mounted on a rivet head 4 which is carried by the upstanding lug 4l5 of'the side The effect of the tension exerted by spring 4l2 between the points 4 and 4" is to collapse the toggle comprising links 400 and 406 to the position shown in Figure 6.

A third link 4| 6 comprising a pair of independent side plates is rotatably mounted at one end thereof on the pin H0. The opposite end of the link H6 is rotatably connected to the pin 4" which is carried by the latch lever "8. I

The latch lever comprises a pair of side plates us and 420 with a tie plate 42! therebetween;

One end of the latch lever is rotatably mounted on the fixed pin 422 so that it is free to rotate thereon.

Pin 0 also rotatably supports one end of the connecting link 34, whichextends between the operating mechanism and the actuating arm of the contact shaft. This link is a single wide member of phenolic insulation.

An abutment 425 is also rotatably mounted on the stationary pin 422. The abutment or main latch 425 comprises a V-shaped member having a center portion 420 which is pivotally mounted on the pin 22, an abutting or latching portion 421 adapted to engage a roller on the pin 405 in the manner hereinafter described, and a release portion 428. I

. The upper edge of release portion 420 is adapted to lie in engagement with the under side of tie plate 42l of the latch lever 8, so that any movement downward of the latch lever 4|! will result in a clockwise rotation of the said portion 420 of the abutment 425 and will result in moving the abutting or latching portion 42! thereof out of posltim.

eng

A spring 440 is so arranged as to tend to yield-' ingly support the abutment member 425 so that the latching portion thereof 42! may always be in positionto engage the roller 405.

Pressure of release portion 428 against the plate of the latch lever limits the eiiect of the spring I and serves positively to position latching portion 421 in predetermined position.

When the link 400 is raised and the knee pin 405 of the toggle formed by the links 400-400 is therefore raised then since the link 4 l 6 (by means of its attachment between pins 0 and 4") prevents pin 0 from approaching closer to the pin 4, the only direction in which the link 406 may rotate by reason of the elevation of the pin 405 is in such a direction that the pin 4 l 0 moves counterclockwise with respect to pin 405.

In this manner, raising of the link 400 in any suitable manner results in an extension or the tension spring 2 (the members then assuming the position shown in Figs. 6 and 10) and in an increase of force tending to draw the pins M0 and 4 together, creating a tendency to collapse the toggle formed by links 406 and 400.

The members are arranged so that When th toggle formed by links 400-406 about pin 405 is in such position that the contacts of the circuit breaker are closed' (as for instance in Figure 7), the toggle is just under center, that is the center of pin 405 does not reach a straight (imaginary) line drawn between the axes of the pins 404 and M0 and does not pass'through suchline.

In this way, this toggle unstable even when set in the closed circuit position. When therefore, the supporting means herein described is removed from the toggle it will immediately collapse owing to the tendency of the tension spring 2 to draw the pins 0 and 4 together.

In the open circuit position and even in the closed circuit position, the pin 4ll is a stationary one in that it is mounted on the latch lever B one end otwhich is fixed by its mounting on the pin 422 and the other end of which is fixed by the engagement of the latching tip 430 with the notch I or the primary latch 432.

Therefore during the closing operation the lower center of rotation of the link M6 is fixed and for this reason also thepin 4| 0 is to some extent supported by the link 4 l 6.

This partial support of the pin 0 by the link 6 results in downward pressure upon the latch lever 8 in closed circuit position of Figures 7 and 10 thus resulting in pressure of the latch lever tip 430 upon the base 433 of the notch 43l.

As the operating link 400 of the toggle 400406 is raised, the roller 405 of the toggle comes in contact with the surface 434 of the abutment 425 and moves the same in a clockwise direction (with respect to Figures'6 and 7) out of the way so that the knee pin 405 may rise. After this pin has passed the area 434 of the abutment 425 then the spring 440 oi! the abutment pushes the abutment 425 in a counterclockwise direction (with respect to Figures 6 and 7) so that the member 428 of the abutment abuts against the tie plate 42l of the latch lever H8 and so that the abutting portion 421 is swung beneath the knee pin 405 of the toggle 400-408 (in the position shown in Figures 7 and 10) to support the same against the tendency of the tension spring "2 to pull the pins 4 and 4|. together and thus collapse the toggle by drivingdownthekneepinlll Should the abutting or latching portion 421 of the abutment 425 be again rotated (clockwise with respect to Figure '7, or counterclockwise with respect to Figure 10) out of engagement with the pin 405, then the tension spring 2 will operate in amannerhereinbefore described to collapse the toggle 4130405 and move the elements back again to the position shown in Figure 6.

The means by which this is accomplished includes the primary latch E32 and the secondary milled latch HQ.

As above'noted, when (Fig, 7) the toggle Milltlifi is in the position for the closed contacts, the knee pin thereof has not passed through center. Likewise, the links so and M6 are in such relation to each other, that the pin Hill which constitutes a knee pin therebetween has also not passed through center. Consequently, owing to this instability any element which will cause any one of the toggles to. collapse will cause all to collapse towards their original position as shown in Figure 6.

The knee pins of the toggle mechanisms are each supported in the closed circuit position; the

knee pin 5555 of the toggle lilill l being supported by the abutment 325; and the knee pin $56 of the toggle 5635-455 being supported in part by the stabilized position of the knee pin M5 and in part the stabilized position of the pin fill. 4

When support is removed from the latch lever sit and it. i allowed to drop under the substantially vertical downward pressure exerted thereon through the link did when in closed circuit position (Fig. 11), then as the tip 135 thereof drops, the tie plate 428 comes in contact with the portion Q28 of the abutment I and causes the same to rotate (in a clockwise direction with respect to Figure 7) (or counterclockwise with respect to Figure ll) about the pin 622 thus removing the latch portion .421 of the abutment 325 from beneath the pin 455 and thus permit- 7 ting the toggle ase-ucs to collapse under infiuence of spring M2 to the position shown in Figure 6.

Collapse of this toggle also collapses the tog- I gie E-flt by causing the knee pin H6 thereof to be drawn by tension spring M2 towards the position shown in Figure 6.

As the link tie is moved from the position shown in Figure 7 to the positionshown in Figur 6 (and through the stage of Fig. 11), the contacts open and the pin 0 reaches the limit of its downward movement. Thereafter the link 6 exerts a slightly upward pull owing to thepull upon the pin M8 by the tension spring M2.

This upward pull now exerted by the link H6 upon the latch lever 418 results in a rise once more of the latch lever and thus permits the spring 0 of the abutment to swing the abutment back to the original position as is again seen in u e 6.

By reason of the. fact, therefore, that a single element, to wit, the link l6, exerts asubstantially downward vertical pressure upon the latch lever in th closed circuit position, and further by reason of the fact that after completion of the rapid opening movement, this downward pressure exerted by the link 6 is. reversed and becomes an upward pull, latches may be designedto cooperate with the latch lever in such a manner as to selectively resist the downward force until they are released and to become automatically reset by reason of the upward movement.

Accordingly, 'we' have here designed a combination of a, primary "2 and a secondary latch 450 for accomplishing this important object.

By the means herein described, as the various links and members of the'operating mechanism assures pass from the closed circuit to the open circuit position, the latches which'have been tripped for the purpose of initiating this movement will automatically reset immediately after the end of the tripping operation so that the only operation required to again close the circuit breaker and hold it closed is 9. raising of the link or in other words, a rotation of the link I00 countercloclzwise (with respect to Figures 6 and '7) about the stationary pin see.

The primary latch comprises s. curved link 432 which is pivotally mounted on the stationary pin add and rotatable thereon. The member 232 has a front cam surface 36!, the notch I hereinbeiore described and the latch lever abutment 33 as well as the resetting toe $62. The primary latch @32 is restrained in latching position by the milled latch 4 .5% hereinafter described that is, it is'restrained against counterclockwise rotation (with respect to Figure 7).

Now, when the restraint against counterclockwise rotation of the primary latch 432 about its pin 356 is removed, then pressure of the tip 530 of the latch lever H8 upon the abutting portion ass of the notch as: of the primary latch 432 causes the latter to rotate about its pin rec thus releasing the latch lever me and allowing the pressure thereon induced through the link 655 to cause it to drop.

This dropping or forcing down of the latch lever M6 swings the abutment 325 out of abutting position in the manner hereinbefore described, thus removing any support from the toggle mechanism toll-let, and thus permitting the pin sea to drop because of the tension of the spring M2 which draws the pins 4M and are together.

'lhe position as the dropping motion of the latch lever is completed is shown in the schematic perspective view of Figure 11 and of Figure 15. This position occupies the briefest possible instant of time during the tripping operation and is but one stage of a single continuous movement. I

As the link H6 is swung about its pivot Ml on the latch lever M8, by reason' of the drawing together of the pins 0 and M5 the confacts are opened and the limit of downward movement is reached. Then what previously has been pressure exerted through the link US hecomes a pull thereon by reason of the pull of the spring 2. By reason of the mounting of the latch lever 8 upon the stationary pin 22, this pull on the link 6 and the pin lll'carriecl by the latch lever, nowresults in a rotation (counterclockwise with respect to Figure '7 and clockwise with respect to Figure 11) of the latch lever 8 thus raising the latch lever once more towards the position shown in Figure 6..

As the latch lever is thus pulled up, the pressure thereof against the cam surface I of the primary latch 432 prevents the resetting of this primary latch or the replacement thereof in its original position until the latch tip 430 of the latch lever H3 strikes the projecting toe 482 01' the primary latch 432. The pressure of the upward movement or the latching tip 430 beneath the projecting toe 482 now causes a rotation of the primary latch 432 (clockwise with respect to 7 Figure 7 and counterclockwise with respect to Figure 11) towards the resetting direction and towards the position, therefore, of Figure 6 so that the latch'tip 430 enters the notch I and lies between the toe 462 and the abutment I of -7 the notch 3| 'in preparation for any subsequent closing operation or tripping operation which may be required of the circuit breaker.

An abutment "2a (Figure 'l) is placed on the bottom wall of the housing to limit the rotation of the primary latch when the toe thereof is struck by the latch lever. The abutment 502 of the primary latch (which limits motion in the tripping direction in the manner hereinafter described) also limits the rotation of the primary latch during resetting by striking against abutment 50211 when the toe 442 is raised by the tip of the latch lever.

It will thus be seen that immediately after the tripping of the primary latch 432 by reason of the removal of the restraining movement hereinafter described, the primary latch 432 is not permitted to rotate to its original position until the latch tip 430 of the latching lever 8 has actually entered the notch 43f. the fact that the latch tip 430 operates against the cam surface 46! of the primary latch. But when the latch tip strikes the toe 462 of the primary latch then the very motion by which it enters the notch 43! causes it to rotate the primary latch to its original position and thus causes the restraining influence thereon to b reset.

The restraining influence heretofore referred to is, of course, the milled latch 450 and it should be understood that the milled latch 45!) when tripped can therefore not return to its original This is by reason of it may not rotate clockwise (with respect to Figure 6) any further distance than that showm This milled latch 45!! is thus of that variety generally known as a dead center latch wherein the force exerted by the latching tip 5M of the primary latch 432 does not tend to induce any movement of the latch 450 but is substantially directed towards the center thereof inducing a condition of stability. When the-shaft 500 is rotated counterclockwise (with respect to Figures 6 and 7) then it need not overcome any substantial force tending to impede its rotation, since the only impedance to such rotation is first the sprin 505 which is merely sufficient to maintain thelatch in locking position and the slight friction between the latching tip 5M of the primary latch and theside of the shaft 500.

Since this friction is exerted only slightly tangentially and hence does not tend substantially to impede rotation of the shaft I00, it is negligible,

- and any tripping action manually induced or latching position until after the primary latch 432 has been reset in its position.

As seen in the diagrammatic view of Figure 17, the mechanism is also trip-free, that is, disengagement of the latches will permit opening of the contacts even though the actuating members are engaged either by the solenoid or' manually.

The milled latch 450 is actually a shaft 500 (se eFigures 3, 10 and 11) having a portion 450 milled out, the milling being of a sufficient depth to permit the base or latch engaging portion 5M of the primary latch 432 to pass therethrough when the shaft 50! is rotated in the proper direction.

An abutment 502 of the bottom of the primary latch 432 lies adjacent the base or latchin tip 501 of the primary latch 432 to limit the movement of the base of the primary latch into the milled latch 450 in the manner shown in Figure 14. The milled latch 45!! and its shaft 5" is normally retained and biased towards the latching position of Figures 3, 'l and 10 by spring The shaft "II is rotatably mounted in suitable bearings "3,503 (cf. also Figure 3) and carries arms 504, 504 and 504' preferably of insulatin material keyed thereto or molded thereon. The spring III which maintains the milled latch in suitable latching position is connected to a stud- Sli. Shaft 5" is tapped and drilled at 5ll'l,to receive the stud 506. The opposite end of. this tension spring is passed through and thereby attached to an eye, in the lug 508 screwed into is drilled and tapped hole in the side wall of the housing.

Arm 5, Figure 6, forming preferably an intesral part'of the insulating am 504' abuts against the set screw ill which may be set and locked by means or locking nut III in the downwardly depending flange SI! of the rear of the housing. This serves to limitthe motion of the shaft 500 carrying the milled portion 450 so that it may rotate in response to the tension of spring 505 only enough to permit latching and so that automatically induced need merely be of sufficient movement to rotate the shaft 500 counterclockwise (with reference to Figures 6 and 7) in order to trip the entire mechanism.

Automatic tripping over current coil I I0 (Figure 1) or of a movement of the manual arm 520 in the manner herein described. The over current coil I [0 may, in a manner which is now well known in the art, actuate a tripping arm 52l (Figures 6 and '7) which may be attached in any suitable manner to a movable armature I lfla of the over current coil.

As seen in Figure 1, the overcurrent coil 1 [0 comprises a plurality of turns preferably of bar copper, the said coil being suitably connected in series between the lower connection stud l I I an the pig-tail terminal post 44. v

The action of the over current coil is designed so that it is one tending to cause the tripping arm 52l to rise and strike the lever 504' keyed to the shaft 500 carrying the milled portion 450. This results in rotation of the shaft 500 of sufiicient extent asshown in Figures 10 and 11 to cause the milled portion 450 to rotate so that its edge is below the latch tip 501 of the primary latch 432.

whereupon the downward pressure of the tip 430 of the latch lever M8 in the manner hereinbefore described causes the primary latch 432 to rotate about its mounting 480 so that the latch tip 5M enters the milled portion 450 a sufilcient distance to permit the latch lever M8 to drop in the manner shown in Figure 11 thus moving the abutment 425 in the manner hereinbefore described to permit the toggles to collapse under the position and when the latch tip 5! of the primary latch 432 is no longer within the milled. slot 450 of the shaft 500 then the spring 505 returns the shaft 500 to its original position and the entire mechanism has then passed from the closed stage shown in Figure 7 through the tripping stage shown in Figure 11 into the contactopen-stage shown in Figure 8.

Solenoid closing When the circuit breaker is in the open circuit position sothat the toggle mechanisms thereof are in the position shown in Figure 6, then the closing operation may be effected by means of the closing solenoid 530 and its moving armature 53| (Figs. 1, 6 and 7), When the circuit is closed to the closing solenoid 530, in any suitable manner, then the closing armature 53! thereof will be raised.

When the closing coil 534i is energizedand the armature 53l thereof is raised, then the rod 532. thereof is raised from the position shown in Figure 6 to the position shown in Figure 7.

The rod 532 is, as shown in Figure 6, immediately beneath the knee pin 405, of the toggle 406-405. The raising of the rod 532 by the energization of the closing solenoid causes a raising of-the knee pin 405 of this toggle byengagement of the end of the shaft with a roller of the pin 405 as shown in Figure '7 until the knee pin roller pushes past the abutment 425 and then rests upon and is retained by the abutting portion Q2! of the abutment 425.

Preferably, the closing coil is thereafter deenergized so asto allowarznature 53! to return to lower position so that rod 532 does not impede the dropping of the knee pirFlOS to the position shown. in Figure 9 should a tripping operation occur.

The opening of the contacts, due to automatic tripping, is assured and rapid whether or not the solenoid is deenergized when a fault occurs. The resetting of 'theilatches, however, cannot be completed until the falling of the plunger perm'its the spring M2, to force the pin down to its lower position.

The armature 53! of the solenoid and the housing thereof (cf. Figure 1) is so arranged that when forced downwardly the bottom of the armature will strike the steel pin sale. This pin is supported only at the ends and is sufliciently elastic to provide an adequate shock absorber when violently contacted by the bottom end of the armature. Manual closing In the present invention, I contemplate also the utilization of a manual means for closing the circuit breaker, said manual means being operative to supplement the solenoid closing operation, both mechanisms being mountable in connection with the same circuit breaker and providing a selective manual or solenoid closing operation.

The manual operating lever 52'} is keyed to the square shaft 550 by means of the screw I. The square shaft 550 is inserted in the squared hollow portion of the cylindrical casting 552 and secured therein if desired by the screw 55211 which may be inserted in the casting, access being obtained through the opening 552!) in the bottom of the housing. The shaft 550 may be of any suitable length depending on whether or not a cover or casing is used for the circuit-breaker and may, with its handle,. be rapidly interchanged, or it may be a removable shaft for use with many circuit-breakers. The cylindrical casting 58! carries thereon a helical cam 553. The operating arm 498 on a downwardly extending portion 55 thereof a roller 58! (see Figures 6, 7, hand 12). v

Thecylindrical casting "2. has a square hole I broached through it. Inthe back part oi this hole, there is secured a short square by means of a set screw. The extreme end. of this shaft is turned round and bears in, a. hole in the arm bent up from the floor of the enclosure. This forms the back hearing: for the casting.

Mounted on the square of this shaft between, the bearing and the casting is the hand trip lever B". The front end of the casting is turned. down to bear in a hole in the front plate. The shaft 558 is a removable unit, so that it; can. be replaced by a different unit suitable for: other ypes of control. These control shafts are held in the casting by a set screw.

A manual rotation of the lever 5m in a. clock- Manual tripping The manual lever 520 and the shaft 550 .to which it is keyed also provides for a manual tripping where that is desired in addition to the automatic trip by means of the over current coil H0.

As is seen in. Figure 8, the shaft 556% carries an arm 560 secured thereto. This arm 560 cooperate with the bent-over flange 561i (Figures; 5, 8, 12, 13 and also Figures 6 and 7) of trip lever 562 to provide a manual tripping of the: circuit. breaker. The trip lever 562 is rotatably mounted on the pin 563 and is restrained in the position. shown in Figures 6, i, and 12, by the coil spring: 564, one end of which presses against th floor of the housing and the other end of which. is bent-over at 565 to engage the trip lever beyond. its fulcrum 563.

The trip lever 562 is provided. with. amabutment 566 which rests against the floor of. the housing to provide a stop therefbn, The trip lever has at the opposite end from the flange: 5M a rounded portion 551 which. may register with the am 568 attached to the shaft 5W. rotation of the trip lever 562 in. a. clockwise tion (with respect to Figures 6 and 7') willv result; in the forcing of the end 551 down onto'thea lever 568 thus causing a rotating of the shaft 5M; against the influence of the spring 5M5 and thus rotating the milled portion, I5!!- thereofi' to the tripping position shown in Figures 11 and. 131.

The manual lever 520 when it is therefore: tated in a counterclockwise direction. (with respect to Figures 2, 5 and 8) causes the: 5'60; at tached to the shaft 550 to bear against the flange: 5 of the trip'lever 562 and. by raising; that; end

of the trip lever 56! depresses the end, 861 of? the 'trip lever. thus rotating the shaft- SW.

the milled latch portion 450 thereof into registry with the latching tip 50! of the primary latch. "I;

and permitting the tripping open of? the. circuit" at the front of the circuit breaker may be suit ably marked with the words Close and Tr-1p!" to indicate the direction in which the lever 520 should be rotated in order to: obtain. the:

' desired action.

Safet look This cooperation between the manual. lever 52! and the arm 560 on the shaft 551i thereof with:

the flange H of the latch level 2 may be utilized for the purpose of locking the circuit breaker in open position to prevent unauthorized closing thereof. Y

AsseeninFigures 1, 6,and3,thetoporthe manual handle or lever 520 may be slotted at Bill to receivea locking bar 602 pivotally mounted upon the pin 603. A suitable spring may, if desired (although it is not essential), be arranged to bias this locking bar 602 so that the locking tip thereof 606 may be pressed against the circular portion 604 of the escutcheon plate 600. The circular portion 604 may have a notch or slot therein 685 as seen in Figure 3.

Rotation of the lever 520 in a counterclockwise direction (with respect to Figure 2) will cause the locking bar 602 to be rotated to such a position that the locking tip 606 may be forced into th notch or cut-out 505.

The rotation in this will also result in the tripping action by means of the trip lever 562. Should the manual lever 520 now be left in position where the tip SIS of the lock bar 802 is engaged in the notch 605, then the end 561 of the latch lever 562 will continue to be firmly pressed against the lever 568 and, as shown in Figure 13, will cause the latch 450 to be continuously in tripped position.

When the manual lever 52!! is left in such position that the arm 560 thereof continuously presses up the flange 56!, then it will be impossible either manually or electrically to close the contacts.

Thelocking bar 602 has a slot 608 therein (Fig. 2) which is so arranged that when the locking tip 606 is depressed into the notch 505, the slot 608 comes into view. This slot is of sufllcient width to permit the passing of the hasp of a padlock therethrough to preventthe depressing of that end of the locking bar and the raising of the locking tip 606 out of the notch 605. "In this Back up trip In the operation of circuit breakers and circuit closing mechanisms, it is sometimes found that careless operators, when the circuit breaker has once been tripped, attempt to close the circuit breaker by only a partial closing p ration.

- In order to prevent an operator from moving the contacts so that they just touch and open again, as is sometimes done to "inch" a motor, I therefore provide a back-up trip so arran ed that any reversal of motion in theclosing of the circuit breaker will result in a. tripping open thereof and so that any attempt to move the contacts to such Ill. During the upward movement of the closins lever I, the tripping p wl is biased into engagement with the ratchet teeth and the ratchet teeth are so arranged that during this upward movement, they slide past the engaging portion 101 of the pawl "I. The lower surfaces of the ratchet I00 are so arranged, howeventhat any downward mohon thereof will cause a depression of the pawl Ill. During the closing operation, should the lever lllfl reverse its movement, the downward movement of this lever will force the ratchet teeth "I! to press the pawl llll downwardly (cf. Figure 13), thus pressing down the end 561 of the trip lever 562 by reason of the fact that the pawl is mounted on that side 01' the'fulcrum 563, thus pressing the tripping end it! of the trip lever against the lever I68, rotating the shaft 500 and causing the milled la'tc 450 to be rotated to tripped position.

In the closing operation, as the toggle pin 580 approaches the center line (in which the arms "0406 tend to approach a straight line position) the movement of the pin 405 becomes relatively large as compared with that of the contact 7 arm 46. It is, therefore, possible to allow the teeththen to move away from the pawl before the lever movement is completed, as seen in Fig- A ures 7 and 12 position that they just touch and no more will result in the tripping open of the circuit breaker. This device (see more particularly Figures 12 and 13) consists of a set of ratchet teeth m mounted on one end of the link "I and enga eable by a pawl Illl pivotally molmted at I02 on the trip lever 562, and urged into engaging Position by the tension spring I03 connectedto the pin Ill attached to the pawl Ill and connected During the closing movement and before this tripping-action has occurred, the pawl lill is in engagement with the ratchet teeth 100 to cause any even slight reverse movement to eifect the tripping action of the trip lever 562. During the tripping operation, however, it is desirable to move the pawl III to such a position that it will not engage the ratchet teeth 100 so as not to impede the dropping of the link 400 and its associated pin.

Likewise, when upon the occurrence of a reverse movement during the closing operation, the ratchet teeth engage the pawl 10! to depress the trip lever and hence cause an automatic tripping in the manner above described; it must also be possible during the remainder of the tripping op. eration initiated by the reverse movement to move the pawl out of the way of the ratchet teeth. Accordi ly, the pawl "I is provided at the bottom thereof with an inwardly bent flange IIII This flange is arranged to coact with" a roller mounted upon a. pin 1' of the latch lever 4L8.

When a tripping of the circuit breaker occurs either by reason of a manual trip, the occurrence of an overload or by reason of a reversal of movetion thereof swings away from the path of the ratchet teeth and permits .the link I and its associated pin to descend without any impediment whatever.

'lbus, upon the occurrence of a reversal of movement the pawl III is engaged with the ratchet teeth ill only for a suflicient length of 1 time to cause a depression of the trip lever for at the opposite end to the pin III on the trip lever 56!.

The pin m rides in the slot as of the trip lever in which limits the motion of the pawl the tripping purposes hereinbefore described, and upon the dropping or the latch lever in response to this action, the pawl is, in the manner above ed from the ratchet teeth,

In spite of the fact that a reversal of movement duripg the closing operation thus results in. a tripiflhs oi the. circuit breaker, the; circuit breaker nevertheless is trip tree in the: manner shown. in Figure 17 so that; even though the; 4106; is. held. inrraised position eitherby the man.- ual. closing; lever or by the solenoid closing; armap ture. the latch lever may" drop in response to an. overload. and thus. permit the opening of the con tact;

Handle reset:

As. is more clearly seen. in figures 3,. 12- and. 13. the manual. operating; lever 52.01 may he; arranged. so that it. will automatically return to: neue tral. position. immediately after either a tripping: or closing: operation. has. been. efi'iected. therewith,.

that: is" irxunediatelyalter any manual pressure been. removed. thezetronr. means; for: returning: the; manual. leverto neutral. position. comprises? an. am. 8.06 mounted. on the: strait 550 and. which. may preferably and. for purposes of economy he an. extension of. and. formed. into.- grally with; the tripping: arm. see. The. arm. ace? provided. with. a roller 8M mounted. on a. stud.

our... The rotatable hearing: when. the strait and the:- manual. operating: lever; 52!!- is in. neutral". po-- sitiom. registers with. the. notch. 803 oi the: lock: 1e. ver 8M. The: lock. lever 80% is pivoted. on. the: stud:

805i and. is. urged into locking position by the.- spring; 8.018.. engages a: in: 801. on. the. looking lever 8134i and the. other end oi. which is en.- gagect. a. lug: 808E struck. up from. the bottom. of the housing; The: set. or neutral. position is shown. in. HSZUI'B; 5;. I

when; the manual opera-ting; lever 52!! is rotatedi towards closing position, them. as shown in.

Figures: 55 and. 8,, the: roller 8M. of the arm. 8W is rotatedv out; of the notch. 80! and? towards: the: outer edge: of theTl'ocking. lever 8M. action. causes a depression 01 the locking lever 8M and. serves to; increase the: tension. on. the spring 8818;. manual pressure: is thereaiterj removed. from the handle. 526, then. the: normal tendency of." the: roller: is; to return. to the. notch. 863 particularlzv since; the. lockixzrg, bar we is causeda to: rise; by reason of. the: spring. 8016;.

G'onsequentlm. the. tendency of. the:- shaft 5501i to: rotated. again. to; the: neutral! position. shown. E-igurez; 5 wherein. the roller 8M2 may register wdthathe notch: and. the. manual. lever 52%)? is then returned. to neutral. position; When the. manual. operating; lever is rotated. in the; opposite. direction; for tripping purposes; as: shown. in. Figure.- 13,,. then: the roller m again. rides up out of. the: notch. in: the: opposite direction, but: again. tending, to depress: the locking; arm: 8 and: therefore extend. the spring we so that when. manual. pressure. is:- again removed. from the manual lever 520? its. nor:- mal tendency is: to return. to. the: positions; shown. ihalfi'gurest ami. 2;

notch. is used. to: definitely fix the;- neutral. position of." the: handle. and to prevent the: return. or. the handle: beyond mid. position. as: might; occur:

. it; after manual closing, the: handle: werereleasedi at the; final closed position. and allowed. to move: back: under the: influence. of. gravity and the: spring'.. Excessive over travel would: cause undesired. tripping; of the: breaker;

' Visual indicator Owing to the; fact. that the. manual lever no thus; automatically returns. to. neutral position. so that; after the contacts. have been closed. they may be: manually tripped. or alter the: contacts.- have.' been. tripped they be: closed... it becomes un- 2 iii. to; the: crank; lever 51 site. end. attached. to a. stud; 9

portant, that; provision. be.- made tor some: indication, preferably visual, 01'." the: contact positiom Such indication. oi the contact position. provided. by! means; of" an. indicator or flag 9W (Figures 33 and? 2 mounted on; a. slider" 901* and. guided; by two] studs: eta-ass suitablysupported from. the: bracket shalt; the: slider 965i; being itselt supported.- loy' suitable washers: or: other means tilt-905..

A. bell. crank: lever 905 is; pivotally mounted uponastudififlal also-extending from the undersidezoiz the bracket shelf comprises; a. bent. overpor tion. 908. engaging; asl'ot 90.9 of. the slider 9M2. Onlya. portion. of the: m: invisible-through am open! 'ing: or window 8W, the has carrying. on! and 'oiic indications; spring; 5; attach Icy alug 2 and. at: the oppoi oi? the; underside of the. bracket; shelf. normal-y biases: the: hell. crank; lever: 906? to. such. position. that it pushes; the: slidier 9M over to. aposition. where the. flag: 9002 d-icates; an: on? position. through; the. aperture 92120.. The bell. crank. lever is: pivotally connected.

at 9? to a. sliding." link: 9 is which is; slidahiy' supported. b z-the.- stud. 974 .51 extending; from. the under" side: of. the bracket: shelf. and carrying smasher 9151. for support; the: stud. Silt registering; with: the.- slot-91B? in. order to permit; a. reciprocal sliding; movement. of the link. 5155, The link M151 carries: a. bent over. lug; 97119; extending: downwardly ere:- from.. h

When. the circuit; breaker closed, so that: the pin. H0. 015: the toggle; is raised. and also pushed. towardsa the; back; end. of. the; circuit breaker;

- knee: pin. strikes: against; the: bearing; surface: 92.0.

of? the; Lug.- 91 .9; and. thus in. its: continuing: back.- ward. movement, pushes: the link. 9135 backward;

thus causing? the: bell. crank. 9B5} to rotate about;

its: pivot; thus; causing: it. to pushthe. sliderover: in; the: direction. indicated by" the: arrow so that;

the on Signal. of the; iiag. 990; will be visible through theaperture 9.170;.

When. the pi'nx 421201 is' thereafter caused. to drop: by a: contact; opening operation, then nothing: will;

.' thereaiter interfere with. the: tendency of. the:-

spring: Still to; draw the: bell crank lever: 9.0.8:? to." its original. position. thus; resetting: the flag; 9.005 to; show the o 1 indication. througirtheapertures Hence although: the. handles 5258i returns; to; mentrail position: alter a. closing; operatibn:, the; indicator above; described. indicates: the;- condition. ot'thezcircuithreaker;

Generaliopemt'iom and arrangement;

Various: other elements may; of. course; utilized in. connection: with and. as an. integrai part of. the: circuit breaker v lmechanisrm. for; instance; as: seen. in. Figure. 2;. a. suitable: time delay" element; 5510 may he provided. inconnection. with". the: over: current. eoii... ii to: permit: the: breaker to. carry normal? loadi above its. trip settins; or short; periods. off time. The: specific: deztails; of;' the? time delay? elements are: not; herein discussed. since; they constitute. no;- part; Of the present; inventiom;

The". various; elements: of the: circuit breaker and the:- op'eratiom 05: each. of the elements have. been described in. connection. with. the; description: of the: members. thereof Each. of. the individual. elements 01: the; circuit breaker.- is' in the; present. invention. integrated with; each of the; other ele-- ments to form. a. unified. integral. operative; whole-..

the.- rotation. of the: manual? operating; lever in.

' one. direction. causes the toggles to. rise in. the

manner described; thus; raising? the: link: 3.4 rot tating the arm 35. rotating the contact shaft and closing the contacts.

The arcing contacts meet before the main contacts are in engagement with each other. Ro-

tating the manual operating lever in the opposite direction trips the toggles in a manner hereinbefore described, and causes the contacts to separate, the arcing contacts separating after the main contacts and the are being established between the arcing contacts only.

The are immediately thereafter is transferred to the arcing horns, and swept up by the magnetic blow out into the arc quencher I50.

The closing solenoid 530 may be utilized instead of the manual operating lever to close the circuit breaker and automatic tripping may be substituted for tripping by the manual lever by the use of the over current coil 0.

The over current coil llll responds to currents in excess of predetermined values passing through the circuit breaker and may be adjusted and calibrated for the particular rating of the transformer.

Solenoid trip coil s may be utilized in connection with any of the levers of the shaft 500 to rotate the same when the coil is energized by any suitable remote control means and thereby provide a remote control non-automatic tripping operation.

The arrangement of all of the parts of the circuit breaker is such that asembly thereof is extremely simple.

The entire movable contact assembly may readily be disconnected from the remainder of the circuit breaker assembly by removing the bearings Mil, Figure 2, from the ends of the contact shaft and removing the in Ill! from its connection between the arm 35 and the link 34 and pigtail.

And the entire toggle mechanism assembly may be readily removed for 'replacementitnd repair by means of the removal of screws 33. A solenoid mechanism may readily be added to a hand operated breaker in the field.

Assembly replacement and repair are thus greatly facilitated. Separation of the various parts for any purpose whatever is made easy and simple and the general arrangement of the members on the panel 23 facilitates the mounting of this panel in a switch board with other similar circuit breakers or other switch devices.

The arrangement (including that of the trip coil, closing coil, time delay element and associated switch) is extremely compact and is confined within the narrowest limits so that even when, as in the manner hereinbefore described. certain poles of the circuit breaker are removed in order to turn the three pole circuit into a one pole or two pole circuit breaker, there is nevertheless no substantial waste space and the same panel may be utilized to mount the circuit breaker in place upon the switch board.

As far as actual use is concerned, the operator 4 tomatic relays which are set in operation by the opening thereof so that the closing of the circuit breaker may be a function or different conditions on the line such as arise in the load resist,

difference which maybe caused to close a circuit to the solenoid closing member 530.

In general, therefore, I have devised a circuit breaker wherein the novelty lies not merely in the specific arrangement of the individual parts thereof, andnot merely in the many extremely important novel constructions comprised therein, but also in the integration and arrangement of all of these parts so that they all operate as a single unit.

Although each of the elements herein described is by itself believed to be completely novel and although the arrangement of the various parts and the integration thereof as a single unit is believed to be of the essence of the present invention, nevertheless various modifications of either the individual members or of the arrangement of the parts may now b clear to those skilled in and also having a tripped position; a toggle mechanism having a collapsed and asset position; link members for operating said' movable contact, a direct mechanical connection from said tog le mechanism to said link members, a direct mechanical connection from said latch to said link members bipassing said toggle mechanism whereby either said latch or toggle members independently operates said movable contact to open position; means for tripping said latch to permit said spring means to operate said contact to open position, said toggle mechanism collapsing in response to the operation of said contact to its open position for resetting said latch in its set position; and means for resetting said toggle mechanism, with said latch in its set position, for operating said contact to circuit closing position.

2. A movable contact havin a circuit closing and a circuit opening position, spring means for normally urging said movable contact to opening position; a latch having a set position for normally locking said contact in closing position and also having a tripped position; said latch including a milled shaft, a primary latch urged into tangential contact with said milled shaft by said contact mechanism, and a latch lever locked in said primary latch and operative on the angular rotation of said milled shaft for rocking said primary latch over the milled portion of said shaft, the rotation of said primary latch releasing said latch lever to effect movement of said contact to open position; a toggle mechanism comprising a single pair of links having a collapsed'and a set position; means for tripping said latch to permit said spring means to operate said contact to open position, said toggle mechanism collapsing in response to the operation of said contact to its open position for engaging and resetting said latch in its set position; and means for resetting said toggle mechanism, with said latch in its set position for operating-said contact to circuit closing position. 3. In a circuit breaker, a movable contact hav- 11 8 a circuit closing and a circuit opening position; spring means or normally biasing said movance or the existence of a predetermined voltage is able contact to open position; a latch for norclu mally locking said contact in circuit closing sition; means responsive to circuit conditions for tripping said latch to permit said spring means to operate said contact to open position; a toggle mechanism comprising a pair or links, a spring connecting the ends of said links and tending to collapse said toggle, a support under the opposite ends of said links for maintaining said links against collapse, said support being connected to said latch and being operative in response to a direct opening of said contact by said latch for thereafter removing said support from said toggle mechanism to eilect a collapse thereof, said toggle mechanism on collapsing resetting said latch in its set position preparatory to the operation oi said contact to circuit closing position: and means for operating said contact to circuit closing position through said toggle. said last mentioned means being eitective to operate said contact to closing position only while said latch is in I its set position.

4s- In acircuit break er, a movable contact having a circuit closing and a circuit opening position, spring means for normally urging said movable contact to circuit opening position; a latch mechanism-for normally locking said contact in circuit closing position, said latch mechanism inmechanically connected to said movable contact; a toggle mechanism having a fixed pivot and mechanicallyconnected to said movable contact; means responsive to circa" conditions for releasing said latch for operation about its fixed pivot to permit said movable contact to operate to its openposition; and means including said toggle.

ingacircuitclomngandacircuitopeningposition, spring means for normally urging said movable contact to circuit opening position; a latch mechanism for normally locking said contact in circuit closing position, said latch mechanism including a lever rotatable about a fixed pivot and mechanically connected to said movable contact: a toggle mechanism having a fixed pivot and mechanically connected to said movable contact; means responsive to circuit conditions for releasing said latch for operation about its fixed pivot to permit said movable contact to operate to its open position; means e to the opening of said contacts for collapsing said toggle about its fixed pivot, said toggle in collapsing said latch in its locked position; and means insaid toggle mechanism operable about its fixed pivot for operating said contact to its circuit closing position whereby said circuit breaker is trip-free. I

6. In a circuit breaker, a movable contact havingacircuitclosingandacircuitopeningposition; spring means for normall urging said movable contact to circuit opening position; a latch for normally locking said contact in mechanism circuit closing position, said latch mechanism including a lever rotatable about a fixed pivot and mechanically connected to said movable contact:

-a toggle'mechanism having a fixed pivot and mechanically connected to said movable contact;

means responsive to circuit conditions for releasing said latch for Operation about its fixed pivot to permit said movable contact to operate eluding alever rotatable about a fixed pivot and toitsopen positionwhiiesaidtoggle H remains in its extended uncnliapsed means controlled by said toggle Ior'reeettingsahi latch; means including said'toggle operable about its fixed pivot for operating laid contacttoitscircintclosingposiflmwherehyesfl circuit breakeristrip free. i

7. Inacircuit breakenamovablecontacthavingacircuitclosingandacircuitopenmposition; spring means for normailysaidmovable contact into circuit opening positim; alatch iorlocklng said contactagainsttheactiondsaid rin means; ands toggle for trammitting circuit clonng operations to saidmovalle Contact. said toggle remaining in its uncollapsed condition wlmn said movable contactmovesiromitsclosedtotheopmpositim; means whereby said latch controls the of saidtogslc mechanism; andmeansihereby said toggle mechanism controls the of said latch.

' 8.Incombination,amilledshait;a1ivoted primary latch in tangential contact with'snid milled shaft; a pivoted secondary latch i N one face of said primary latch; said face having ,an arcuate curve with said pivot pointed said ,secondary latchasacenterwhensaidpehmry latch is over the milled portion of said shaft;

alockingnotchinsaidprimarylatehiormroverthemilled'portionofsaidshamaidneondarylatchrotatingoversaidarcuatesurfaeein anoscillatingmovementahmtitspivotandmgaging a proiectiononsaid primarylateh for applyingarotatingtomueintheoppositedlrectiontorwithdrawingsaidprimarylatchhm 9.'In combinatiomamilledshainam primarylatchiniith "saidmilledshainandasecondarylatdienlllingsaidprimarylatchandoperativeonthemhtionofsaidmilledshatttodrivesaidpdmry 'latcnintoandontotsaidrm shalt.

lc.lnamilledshait;arlvcted primarylatchintangential 1-;

n handalatch saidprimarylatchand'operatlvemthemtatim disaid milledshait'todrivesaid-plimaryhtdr intoandoutoisaidmiliedshai't;amonbiecmtacthavingacircuit position,

saidmovablecontactintocircmtopeningpoltiim. said latch being .to said movable contact for permittingsaidcontacttooperatetoopenposiflmwhm said primary. latch has been driven on said milled'shart.

inrncombimm mmeem; am" primarylatchintangmtialwiflrnld v milled shaft: and a secondary latch engaging saidprrimarylatchandoperaflveontherohtin -orsaidmilledshattto-drivesaidprhnuyiateh -saidm'imarylatchhasbeeniir'ivlendversaid milled haft; and a toggle bysaidlatchmiismnfl arcuatesurfaceforreversingtheotslll tangentialoontactwithsaidmilledshattbysaid contact mechanism. and a latch lever locked in said primary latch and operative on the angular rotation oi. said milled shatt ior rocking said primary latch over the milled portion of said shaft. the rotation of said primary latch releasing said latch lever to eilect movement of said contact to open position.

man: J. POKORNY.

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