US2448695A - Circuit breaker - Google Patents

Description

p 7, 1948. A. vAN RYAN 2,448,695

CIRCUIT BREAKER Filed July 24, 1944 5 Sheets-Sheet 1 I uvvavmn.

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A. VAN RYAN V CIRCUIT BREAKER 5 Sheets-Sheet 2 Filed July 24, 1944 mvavrox. imam 144mm P 7, 1948. A. VAN RYAN 2,448,695

CIRCUIT 'BRIAKER Filed July 24, 1944 5 Sheets-Sheet 5 IN VEN TOR. 3 III/I017) l/w/fw/v at im p 7, 1948. A. VAN RYAN 2,448,695

cmcurr BREAKER 7 Filed July 24, 1944 5 Sheets-Sheet 4 INVEN TOR.

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Filed July 24, 1944 A. VAN RYAN 2,448,695

CIRCUIT BREAKER 5 Sheets-Sheet 5 INVENTGR. 1 limo/w kw/Pw/v Patented Sept. 7, 1948 CIRCUIT BREAKER Anthony Van Ryan, South Milwaukee, Wis., as-

signor to Line Material Company; a corporation of Delaware Application J 1113 24, 1944, Serial No. 546,245 12 Claims. (Cl. 20089) This invention relates to circuit breakers.

Objects of this invention are to provide a circuit breaker which is completely housed in a metal can provided with a metal top, which is operated either automatically or manually, and which when operated in either manner has a very quick opening motion, which is positive in its operation, and which is so arranged that when it is in open position an operating handle is positively moved to an indicating position, such operating handle serving the triple function of a manual opening means, a manual resetting means and an indicating means.

Further objects are to provide a circuit breaker in which all of the mechanism is suspended from the top of the can, in which the can is filled with oil and is devoid of openings through which oil may escape, and in which the can is adapted for mounting on a suitable support, thus allowin the cover with all of the suspended mechanism to be lifted from the can for inspection or repair of the mechanism.

Further objects are to provide a circuit breaker in which a plurality of springs are arranged to act directly on the associated parts actuated thereby without the intervention of cams or other intermediate means, in which the moving parts are relatively light so that when the circuit breaker is either manually or automatically tripped a quick opening motion is secured, and in which the springs are so associated with the other elements of the mechanism that no spring acts in opposition to any other spring during the opening motion of the circuit breaker but in which the springs coact in such a manner as to produce the quick opening of the circuit breaker.

Further objects are to provide a circuit breaker in which the operating handle is so associated with other portions of the mechanism that it is trip free so that the circuit breaker will automatically open even though the handle be held in circuit breaker closed position, in which there is no blow imparted to the handle when the circuit breaker opens, and in which the circuit breaker is arranged to automatically open under overload conditions although the handle may be moving towards circuit breaker closed position.

Further objects are to provide a circuit breaker which may be very cheaply constructed and which although having the desirable features hereinabove enumerated is nevertheless of relatively simple construction.

Embodiments of this invention are shown in the accompanying drawings, in which:

Figure l is a side elevation of the circuit breaker with a part in section.

Fig. 2 is a sectional view on the line 2-2 of Figures 1 and 4 showing the circuit breaker in closed position.

Figure 3 is a sectional view on the line 3-4 of Figure 4 showing the circuit breaker in closed position.

Figure 4 is a top plan view with parts broken away and parts in section, such view showing the upper portion of the mechanism and omittin the lower portion thereof for the sake of clearness.

Figure 5 is a sectional view on the line 5-5 of Figure 2.

Figure 6 is a sectional view corresponding to the lower portion of Figure 3 and showing the parts in open position.

Figure '7 is a fragmentary view showing the parts in the position they assume just after the circuit breaker has started to automatically open.

Figure 8 is a fragmentary view corresponding to Figure 7 but showing the handle just prior to the completion of its manual opening motion.

Figure 9 is a view corresponding to Figure 7 showing the position of the parts after the circuit breaker has been opened either manually or automatically.

Figure 10 is a fragmentary detail of a further form of the invention.

Referring to the drawings, particularly Figure 1, it will be seen that the circuit breaker is provided with a metal can I adapted to contain oil and to house the parts of the circuit breaker. The can is provided with a metal top 2 and with a pair of insulating bushings 3 and l which carry terminals 5 and 6, the terminal 5 being the load terminal and the terminal 6 the line terminal. Means, not shown, are provided for grounding the can and top of the circuit breaker. A selfquenching spark gap is provided between at least the line terminal 6 and the metal top 2 of the housing and may consist of an upper downward- 1y projecting electrode 1 housed within an inner fiber tube 8 surrounded by a Bakelite tube 9 and mounted immediately above a lower upwardly projecting electrode ill. The can I is provided with any suitable type of bracket, such as shown at l l, whereby it may be secured to a support not shown. As will be seen from Figures 2 and 3, the insulating bushings 3 and 4 extend downwardly through the top of the can and project below the oil level indicated at l2.

The terminal 6 is connected to one of the stationary contacts indicated generally by the reference character l3 in Figure 3. The other stationary contact indicated generally by the reference character l4 in Figure 3 is connected to one side of a solenoid l5, the other side of which is connected to the terminal 5. The stationary contacts I3 and I4 are rigidly attached t rlgid supporting portions l6 and include rZsilient U-shaped conducting members I! terminating in contact members l8 which, as shown in Figure 3, are provided with upwardly turned end portions abutting the ends of the U-shaped resilient members i1 and also forming a rounded outer face. Similar types of movable contact members l9 are carried by the movable contact arms 20. The contact arms 28 are rigidly secured to channel-shapedmetal members 2| pivoted as indicated at 22 and joined by means of a flexible conductor 23. The channel members 2| are pro vided with overlapping arms which are slotted as indicated at 24 and receive a pin 25 carried by a slide bar 28 formed of insulating material.

It is to be noted from Figures 3 and 6 that metal pins 21 are provided which act as stops for the movable contacts as shown in Figure 3 and for limiting the motion of the stationary contacts as shown in Figure 6. The movable and stationary contacts are carried in an inverted channel-shaped housing 28 formed of insulating ;material and open at its sides and lower portion and spaced by means of a plurality of insulatlng pins 29, such pins acting also as insulating baffles to aid in the suppression of the arc during opening of the circuit breaker, it being notedthat the housing 28 constitutes an arc chute and that there is a magnetic blow-out action due to the fact, as will be seen from Figure 3, that the circuit leading through the movable and stationary contacts constitutes in effect a loop which tends to enlarge at the time the circuit breaker is open, thus blowing the arc outwardly at opposite sides and against the insulating spacer pins 29. The are chute 28 is preferably formed integral throughout and its lower portion is held against opening outwardly by means of metal pins 30 whose ends are reduced and are riveted over in a well known manner. The pins 30 also act as stops to limit the opening motion of the movable contacts, as.

shown in Figure 6, and consequently act as stops to limit the upward motion of the insulating slide bar 26.

The insulating slide bar 23 is permanently biased upwardly towards switch open position by means of a pair of springs 3|, see Figure 3, whose lower ends are attached'to a pin 32 secured to the upper end of the slide bar 26, the upper ends of the springs being attached to a transverse pin 59'. The slide bar is guided by means of a slotted U-shaped metal plate 33 rigidly attached to the arc chute or insulating housing 28.

It is to be noted that the insulating housing is rigidly carried by means of a plurality of downwardly extending tubular insulating members or pillars 34 whose upper ends are attached by means of threaded pins 35 to bosses 38 formed integrally with the cover 2 and whose lower ends are attached by means of screws 31 to a pair of brackets 38 rigidly attached to the arc chute or insulating housing 28 on one side thereof, see Figure 2, and to a pair of outwardly looped fiber supporting members 39,.see Figure 5, which support the solenoid and which are attached to the magnetic frame or yoke 40 of the solenoid and to the insulating housing or are chute 28. The brackets 38 are preferably integral with the supports I 3. The tubular insulating members are provided with upper and lower apertures so that they will be filled with oil to thereby increase the insulation between the upper and lower ends thereof.

The solenoid construction, it will be seen from Figures 2, 5 and 8, is provided with the metal yoke 40 which extends down opposite sides and across the top of the solenoid and which is completed by means of a magnetic transverse bot tom portion 4| apertured to permit the passage therethrough of the insulating tube 42 on which the solenoid I5 is wound. If desired, the tube 42 may be made integral with the upper and lower flanges 43 of the solenoid I5. A non-magnetic upper plate 44 is secured to the upper yoke portion of the solenoid and is provided with upstanding ears between which a fiber or other insulating cam like or tripping member 45 is pivotally mounted as indicated at 46. The center of gravity of the tripping member 45 is to the left of the pivot 46, as viewed in Figure 2, so that the tripping member tends to remain in its nontripping position. It is provided with an outer cam face 41 which is adapted to coact with toggle link mechanism hereinafter described.

The lower end of the lower link 48 of a toggle link mechanism is pivoted by means of the pin 32 to the insulating slide bar 26. This lower link is composed of channel-shaped metal and its upper end is pivoted by means of the pin 50 to the lower end of the upper metal link 5| of the toggle link mechanism.

The upper end of the upper link 5| of the toggle link mechanism rigidly carries an upper pin 52 which is cut across along a diameter to provide a flat face 53, as shown in Figures 2, '7, 8 and 9. The pin 52 is pivotally carried by a rock arm 54 which is integral with an oppositely projecting rock arm 55 and also integral with an upwardly extending ear 56 to which one end of a spring 51 is attached, the other end of the spring being attached as indicated at 58 in Figure 2 to the cover 2. It is to be noted that the springs 3| which urge the slide bar 26 upwardly and the spring 5'! both act in the same sense, that is to say, they both act in a manner tending to open the circuit breaker. Upward motion of the pin 52 is normally prevented by means of the latch lever 59 pivoted on the pivot pin 59', see Figures 2, 3, 7 and 8, suitable spacing sleeves being provided on the pin 59, as shown in Figure 3. The

latch lever 59 is provided with a flat face 60 normally in contact with the flat face 53 of the pin 52 and with an upper shoulder 8| against which the remaining part of the cut away portion of the pin 52 normally bears, as shown particularly in Figure 8. It is to be noted also that the latch lever 59 is provided with a projecting finger 62 and is spring urged by means of the leaf spring 83 in a clockwise direction.

Normally the toggle link mechanism composed of the levers 48 and 5| is in a slightly over-center position so that the center of the intermediate pin 50 is slightly to the left of the line joining the center of the pins 32 and 52, seeFigure 2. The toggle link mechanism tends to collapse to the left under the influence of the springs 3|, but is prevented from so doing by means of the overhanging portion 64 of the channel-shaped link 48 which overhanging portion bears against the side of the link 5|. The link 5|, it is to be noted from Figures 2, '7, 8 and 9, is provided with a projecting foot 65 which is located in close proximity to the cam face 41 of the tripping member 45 and is adapted to be pushed to the right as viewed in Figure 2 when the tripping member is raised through the action of the solenoid l5 on the magnetic plunger 66. The magnetic plunger 56 is loosely slidably mounted in the insulating tube 42 and is prevented from dropping through the open bottom thereof by means of a transverse pin 61. When the magnetic plunger 65 is raised upon the flow of excess current through the solenoid l5, the upper projecting pin 68 of such plunger rocks the tripping member 45 from the position shown in Figure 2 to the right and thus initiates collapse of the toggle link mechanism and allows the springs 3| to become effective to continue collapsing motion of the toggle link mechanism,

The position of the parts in the early portion of the automatic opening motion of the circuit breaker is shown in Figure '7.

Details of the operation from this point on will be given hereinafter.

The cam surface 4'! of the tripping member 45 is so contoured with reference to the foot 65 of the upper link 5| of the toggle link mechanism that it is in close proximity to the foot portion 55 during the final portion of the closing motion of the circuit breaker so as to allow the circuit breaker to open even during the closing motion if an overload exists.

It is to be noted from reference to Figure 2 that the plunger 66 normally occupies its lowermost position being urged downwardly by gravity and also by means of a light spring 69 loosely coiled about a reduced portion 19 of the plunger and bearing at its lower end against a shouldered part of the plunger and at its upper end against the non-magnetic plate 44.

One form of condition responsive means responsive to overload conditions has been shown but it is to be distinctly understood that other types of condition responsive means responsive to other conditions could be employed.

A rock shaft 1| extends from the interior to the exterior of the cover 2 and is carried in suitable bearings formed integrally with the cover, as indicated in Figure 4. The integrally formed rocking levers 54 and 55 are loosely pivotally mounted on the rock shaft 1 At its outer end the rock shaft 1| rigidly carries an eyeleted manipulating handle 12, see Figure 4. A short lever 13 is rigidly secured to the rock shaft 1| and is located in close proximity to the lever 55 and is provided with a laterally extending lug 14 located below the lever 55. A spring 15, see Figure 2, is interposed between the levers 55 and I3 and normally holds the lug 14 in contact with the lever 55, as shown in Figure 2. The lever I3 is provided with a projecting finger 16 which is adapted to engage a stop 11, see Figure 2, to limit downward rocking motion of the handle. The

'lever 13 is also provided with a laterally projecting tripping portion 18, see Figures 2 and 8, which is adapted to engage the finger 62 of the latch lever 59 when the handle is pulled downwardly. The engagement between the projecting portion 18 of the lever 13 and the finger 62 of the latch lever 59 is just beginning in Figure 8.

The operation of the apparatus is as follows: Assume that the circuit breaker is in closed position and that an overload occurs. The plunger 55 is drawn upwardly into the solenoid I5 and the pin 88 thereof rocks the trip member 45 from the position shown in Figure 2 to the positionshown in Figure '7 and thus breaks the toggle 48 and 5| and initiates collapse of the toggle. The springs 3| are now effective to produce collapsing motion of the toggle, As the upper link 5| of the toggle rocks as indicated in Figure '7,

the lower edge at the cut away portion of the pin 52 pushes the latch lever 59 to the right and the upper edge at such cut away portion disengages itself from the shoulder 6| of the latch lever 59 and thus frees the double armed rock lever 54 and 55. The spring 51 is now effective and rocks the lever 54, 55 in a counterclockwise direction from the position shown in Figure '7 to the position shown in Figure 9. As previously described, the stop pins 30, see Figures 3 and 6, limit the motion of the arms 20 and consequently limit the upward travel of the slide bar 26. It is obvious, therefore, that the rocking lever 54, 55 straightens the toggle 48, 5|. A small spring 19 is loosely coiled about the pin and opposite ends thereof bear against the links 48 and 5| of the toggle link and tend to straighten the toggle link and move it slightly past dead center to the position shown in Figure 9. The spring '19 shows in Figures 2, 7 and 8 but is hidden by the parts in the position shown in Figure 9.

As the arm of the rock lever moves in a counterclockwise direction, it bears against the lug 14 of the short lever I3 and rocks such short lever, and consequently the rock shaft, in a counterclockwise direction, the lever 13 and the rock lever 54, 55 moving as a unit. The rocking of the rock shaft 1| causes the handle 12 to move from its hidden position within the housing 80, see Figure 4, downwardly to an exposed or indicating position, as shown in dot and dash lines in Figure 9, thus giving anindication that the circuit breaker is open.

The circuit breaker is readily reset by pushing upwardly on the handle 12 by means of a switch stick. The lug 14 of the lever 13 engages the lever 55 and rocks the lever 54 downwardly, thus closing the circuit breaker and causing the pin 52 carried by the upper link 5| to again be latched by the latch lever 59.

When it is desired to manually open the circuit breaker, the operating handle 12 is engaged by a switch stick and is pulled downwardly. This downward motion of the handle 72 rocks the rock shaft H and consequently rocks the lever 13 against the action of the spring 15, the floating or rock lever 54, 55 remaining in its initial position, as shown in Figure 8, until the trip portion 18 of the lever 13 engages the finger 62 of the latch lever 59, as shown in Figure 8, and pushes such lever to the right, thus freeing the pin 52 and allowing quick opening of the circuit breaker under the influence of the springs 3|, 51 and 15 without collapse of the toggle link mechanism as all of these springs act in the same sense tending to open the circuit breaker during manual opening. The parts are shown in the position where the trip portion 18 is just engaging the finger 62 of the latch lever 59, in Figure 8. Continued downward motion of the handle causes disengagement of the latch lever 59 from the pin 52, as described above. The final position of the parts is shown in Figure 9.

If it is desired to have a time delay action, this may be readily accomplished by partially closing the lower end .of the tube 42' by means of a cap 8| provided with a small aperture 82, as shown in Figure 10. The tube 42 may be identical with'the tube 42 except that its lower end is threaded to receive the cap 8|. It is apparent that upward motion of the plunger 66 is delayed by the restricted flow of oil into the space beneath the plunger while the plunger is being raised. If desired, the upper portion of the tube 42' may be slightly enlarged so that the 7 final upward motion of the plunger just as it is engaging the trip member 55 may be very quick.

It will be seen that a simple and reliable type of circuit breaker has been provided by this invention which is economical to build and which is certain in its operation. It will be seen that when the circuit breaker is tripped automatically on overload, the toggle link mechanism collapses. Collapse of the toggle link mechanism is followed by the automatic straightening of the toggle link mechanism. This gives a very quick opening stroke to the circuit breaker. However, when the circuit breaker is manually opened, it also has a very quick opening stroke as the spring 51 rocks the rock lever 54, 55 from the position shown in Figure 7 to the position shown in Figure 9 and opens the clcruit breaker without'collapse of the toggle link mechanism, the springs 15 and 3| assisting in this operation.

It will be seen further that the springs act directly on the parts with which they are associated and do not act through the agency of cams or other means. It will also be seen that the moving parts of the circuit breaker may be made very light and consequently will have very little inertia, thus giving a quick action to the circuit breaker whether manually or automaticall opened.

It is to be noted particularly with reference to the springs that they do not oppose each other but each is wholly eflective to produce the operation for which it is intended without opposition of any other spring. This is particularly true of the springs 3| and 51. The spring 15 normally holds the handle 12 in its uppermost or hidden position and holds the lug 14 of the lever I3 in contact with the lever 55, the spring 15, however, yielding when the circuit breaker is being manually opened as indicated in Figure 8 and finally bringing the lever 55 again into contact with the lug 14 in the final open position as shown in Figure 9 after manual operation. During automatic operation the floating lever 54, 55 and the short lever 13 rock as a unit to the position shown in Figure 9. It is to be noted that the springs 3|, 51 and I are all operative in the same direction. The spring 15 aids in the opening motion of the circuit breaker when manually operated. The spring 15 normally holds the handle in its uppermost position and returns it to that position should it be moved partially downward and thus prevents the handle from remaining in an intermediate position.

It will be seen further that all of the effective parts of the circuit breaker are freely removable from the can I as it is merely necessary to remove the cover 2 after removal of the securing means holding the cover in place so that the parts of the circuit breaker may be readily inspected or repaired as desired. It is preferable to provide a rolled edge 83 for the upper edge of the can I, which rolled edge engages a gasket 84 carried inside of the downwardly extending flange 85 formed integrally with the cover. It is also preferable to provide an insulating lining 86 for the can I which lining occupies the interior lower portion of the can.

Although this invention has been described in considerable detail, it is to be understood that such description is intended as illustrative rather than limiting, as the invention may be variously embodied and is to be interpreted as claimed.

I claim:

1. A circuit breaker comprising switch means,

normally extended toggle link mechanism'having one end operatively connected to said switch means, latch means normally holding the other end of said toggle link mechanism from motion of translation, means for detaching the said other end of said toggle link mechanism from said latch means when said toggle link mechanism executes collapsing motion, and means including condition responsive means for causing said toggle link mechanism to execute collapsing motion.

2. A circuit breaker comprising switch means, normally extended toggle link mechanism having one end operatively connected to said switch means, latch means normally holding the other end of said toggle link mechanism from motion of translation, means operated by said toggle link mechanism for detaching the said other end of said toggle link mechanism from said latch means when said toggle link mechanism executes collapsing motion, and means including condition responsive means for causing said toggle link mechanism to execute collapsing motion.

3. A circuit breaker comprising switch means, normally extended toggle link mechanism having one end operatively connected to said switch means, latch means normally holding the other end of said toggle link mechanism from motion of translation, means for detaching the said other end of said toggle link mechanism from said latch means when said toggle link mechanism executes collapsing motion, means including condition responsive means for causing said toggle link mechanism to execute collapsing motion, and means for extending said toggle link mechanism and causing reengagement between the said other end of said toggle link mechanism and said latch means.

4. A circuit breaker comprising switch means, normally extended toggle link mechanism having one end operatively connected to said switch means, latch means normally holding the other end of said toggle link mechanism from motion of translation, means operated by said toggle link mechanism for detaching the said other end of said toggle link mechanism from said latch means when said toggle link mechanism executes collapsing motion, means including condition responsive means for causing said toggle link mechanism to execute collapsing motion, and means for extending said toggle link mechanism and causing reengagement between the said other end of said toggle link mechanism and said latch means.

5. A circuit breaker comprising switch means, normally extended toggle link mechanism having a first link and a second link, said second link having its outer end connected to said switch means, latch means normally holding the outer end of said first link against motion of translation, means including condition responsive means for causing said toggle link mechanism to execute collapsing motion, said toggle link mechanism being biased towards motion of translation, means for unlatching the outer end of said first link upon rocking motion of said first link, and manual means for unlatching the outer end of said first link.

6. A circuit breaker comprising switch means, normally extended toggle link mechanism having a first link and a second link, said second link having its outer end connected to said switch means, a pin rigid with the outer end of said first link and having a projecting segmental portion provided with a flat face and with corners, a latch lever having a fiat face normally contacting the fiat face of the segmental portion of said pin and having a shoulder against which one corner of the segmental portion of said pin bears, means biasing said toggle link mechanism towards motion of translation and normally restrained by said latch lever, and means including condition responsive means for causing said toggle link mechanism to execute collapsing motion, the segmental portion of said pin being rotated when said toggle link mechanism is collapsing, whereby the normally latched corner of said segmental portion moves away from the shoulder of said latch lever and another corner of said segmental portion pushes said latch lever towards unlatching position.

7. A circuit breaker comprising switch means, normally extended toggle link mechanism having a first link and a second link, said second link having its outer end connected to said switch means, a pin rigid with the outer end of said first link and having a projecting segmental portion provided with a fiat face and with corners, a latch lever having a fiat face normally contacting the fiat face of the segmental portion of said pin and having a shoulder against which one corner of the segmental portion of said pin bears, means biasing said toggle link mechanism towards motion of translation and normally restrained by said latch lever, means including condition responsive means for causing said toggle link mechanism to execute collapsing motion, the segmental portion of said pin being rotated when said toggle link mechanism is collapsing, whereby the normally latched corner of said segmental portion moves away from the shoulder of said latch lever and another corner of said segmental portion pushes said latch lever towards unlatching position, and manual means for pushing said latch lever towards unlatching motion.

8. A circuit breaker comprising switch means, toggle link mechanism having a first link and a second link, the outer end of said second link being connected to said switch means, a rock lever connected to the outer end of said first link, said toggle link mechanism normally occupying an extended positionv a first biasing spring biasing said toggle link mechanism towards motion of translation, a second biasing spring biasing said rock lever towards'rocking motion, a latch normally restraining said toggle link mechanism and said rock lever against translatory and rocking motion respectively, condition responsive means for initiatin collapse of said toggle link mechanism, said first biasing spring acting to produce further collapsin motion of said toggle link mechanism after initiation thereof, means for releasing said latch, stop means for limiting the translatory motion of said second link, said second biasing spring causing said rock lever to straighten said toggle link mechanism, and means for rocking said rock lever to reset and close said circuit breaker.

9. A circuit breaker comprising switch means, toggle link mechanism having a firs't link and a second link. the outer end of said second link being connected to said switch means, a rock lever connected to the outer end of said first link, said toggle link mechanism normally occupying an extended position, a first biasing spring biasing said toggle link mechanism towards motion of translation, a second biasing spring biasing said rock lever towards rocking motion, a latch normally restraining said toggle link mechanism and said rock lever against translatory and rocking motion respectively, condition responsive means for initiating collapse of said toggle link mecha nism, said first biasing spring acting to produce further collapsing motion of said toggle link mechanism after initiation thereof, means for releasing said latch, stop means for limiting the translatory motion of said second link, said second biasing spring causin said rock lever to straighten said toggle link mechanism, and mm. oating means normally held in engagement with said rock lever and adapted to move to indicating position when said rock lever rocks as a result of the translatory motion of said toggle link mechanism.

10. ,A circuit breaker comprisin switch means, toggle link mechanism having a first link and a second link, the outer end of said second link being connected to said switch means, a rock lever connected to the outer end of said first link, said toggle link mechanism normally occupying an extended position, a first biasing spring biasing said toggle link mechanism towards motion of translation, a second biasing sprin biasing said rock lever towards rocking motion, a latch normally restraining said toggle link mechanism and said rock lever against translatory and rocking motion respectively, condition responsive means for initiating collapse of said toggle link mechanism, said first biasing spring actin to produce further collapsing motion of said toggle link mechanism after initiation thereof, means for releasing said latch, stop means for limitin the translatory motion of said second link, said second biasing spring causing said rock lever to straighten said toggle link mechanism, and indicating means normally operatively'spring held in engagement with said rock lever and adapted to move to indicating position when said rock lever rocks as a result of the translatory motion of said toggle link mechanism, said indicating means being manually movable to reset and close said circuit breaker against the action of said first and second biasing spring.

11. A circuit breaker comprising switch means, toggle link mechanism having a first link and a second link, the outer end of said second link being connected to said switch means, a rock lever connected to the outer end of said first link, said toggle link mechanism normally occupying an extended position, a first biasing spring biasing said toggle link mechanism towards motion of translation, a second biasing spring biasing said rock lever towards rocking motion, a latch normally restraining said toggle link mechanism and said rock lever against translatory and rocking motion respectively, condition responsive means for initiating collapse of said toggle link mechanism, said first biasing spring acting to produce further collapsing motion of said toggle link mechanism after initiation thereof, means for releasing said latch, stop means for limiting the translatory motion of said second link, said second biasing spring causing said rock lever to straighten said toggle link mechanism, a rock shaft, a manually operable handle rigidly carried by said rock shaft, and a lever rigidly carried by said rock shaft and having a projecting portion normally held in contact with said rock lever by spring means and movable by said rock lever when said rock lever rocks as a result of the translatory motion of said toggle link mechanism, said manually operable handle when moved in one direction causin resetting and closing of said circuit breaker.

12. A circuit breaker comprising switch means, toggle link mechanism havin a first link and a second link, the outer end of said second link lever connected to the outer end of said first link,

said toggle link mechanism normally occupying an extended position, a first biasing spring biasin said toggle link mechanism towards motion of translation, a second biasing spring biasing said rock lever towards rocking motion, a latch normally restraining said toggle link mechanism and said rock lever against translatory and rocking motion respectively, condition responsive means for initiating collapse of said toggle link mechanism, said first biasing spring acting to produce further collapsing motion of said toggle link mechanism after initiation thereof, means for releasing said latch, stop means for limiting the translatory motion of said second link, said second biasing sprin causing said rock lever to straighten said toggle link mechanism, a rock shaft, a manually operable handle rigidly carried by said rock shaft, and a lever rigidly carried 12 by said rock shaft and having a projecting portion normally held in contact with said rock lever by spring means and movable by said rock lever when said rock lever rocks as a result of the translatory motion of said toggle link mechanism, said manually operable handle when moved in one direction causin resetting and closing of said circult breaker, the said lever rigid with said rock shalt having means for engaging and releasing said latch lever when said manually operable handle is rocked in the opposite direction.

ANTHONY VAN RYAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date Coy June 4, 1940 Number

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