US2530298A

US2530298A - Manual controlled device for automatic circuit recloser mechanisms

Info

Publication number: US2530298A
Application number: US7604A
Authority: US
Inventors: James K Harper
Original assignee: AB Chance Co
Current assignee: AB Chance Co
Priority date: 1948-02-11
Filing date: 1948-02-11
Publication date: 1950-11-14
Anticipated expiration: 1967-11-14

Description

Nov. 14, 1950 J. K. HARPER MANUAL CONTROLLED DEVICE FOR AUTOMATIC CIRCUIT REcLosnR uEcHANIsus 2 sheets-sheet 1 Filed Feb. 11, 1948 Nov. 14, 1950 J. K. HARPER 2,530,298

MANUAL CONTROL-LED DEVICE FOR AUTOMATIC CIRCUIT REcLosER MEcHANrsMs Filed Feb. 11, 1948 2 Sheets-Sheet 2 nvennr czymesjjarper ZAM/@zdf Patented Nov. 14, k1950 MANUAL CONTROLLED DEVICE FOR AUTO- lVIATIC CIRCUIT RECLOSER MECHANISMS James K. Harper, Centralia, Mo., assignor to A. B. Chance Company, Centralia, Mo., a corporation of Missouri Application February 11, 1948, Serial No. v7,604

The present invention relates to manual controlling devices for automatic circuit recloser mechanism, and is particularly concerned with the manual controlling devices for the mechanism disclosed in theJ prior application of David C, Hubbard, Serial No. 740,687, iled April 10, 1947, for Automatic Circuit Recloser Mechanism.

The recloser mechanism referred to is a circuit maker and breaker of the type which is adapted to be immersed in. an insulating liquid, such as oil. For a full disclosure of the automatic circuit recloser mechanism with which these controlling devices are to be used, reference may be had to the prior application above mentioned, the general purposes and characteristics of which will now be set forth insofar as they have a bearing upon the manual controlling devices.

The circuit recloser mechanism is preferably of the type in which an overload causes a fast opening of the circuit on the first and second occurrences of an overload, but which interposes a time delay before the opening of the circuit on the third and fourth occurrences of an overload. After the third or fourth operationl the mechanism is preferably provided with means for holding the circuit breaker in the open position so that it can only be closed by a manual operation.

The overload conditions which may cause the opening of such an overload protectiondevice,

may be temporary and, if temporary, the circuit y may again be closed automatically without Waiting for attention upon the part of the lineman. This automatic closing of the circuit for temporary line faults increases the service continuity and reduces the areas which are cut out of service, due t0 overload, to the smallest possible area.

If, however, the circuit condition which has caused an overload is not temporary, or if it requires a longer time to correct itself, then it is desirable that the overload mechanism be closed automatically only after a time delay. Such a vision of an improved manual controlling mechanism for automatic circuit reclosers, which gives a visual indication when the contacts are open so that the serviceman may see the condition ofthe device. p

Another object of the invention is the provision of an improved manual controlling device for automatic circuit reclosers which permits the recloser to operate and reclose the circuittwice, and also to reset itself after a time delay on the third or fourth operation.

Another objectof the invention is the provision of an improved manual controlling device for automatic circuit reclosers which devices are trip-free, so that after a lock-out of the circuit breaker, when the contacts are reclosed manually while the short circuit or overload still continues, the contacts maybe opened automatically even though the operator is holding the manual devices inthe closing position.

Another object of the invention is theprovision of an Vimproved mechanism, which permits the circuit recloser to reset itself for a normal fourcycle operation whether the contacts are closed manually'after lock-out, or whether the contacts are closed automatically after a momentary fault of insufficient duration to cause a lock-out.

Another object of the invention isV the provision of an improved mechanismof the class described, which permits the contactsto be opened manually into the lock-out position at will.

Another object of the invention is the provision of an improved mechanism of the class described, which Ymay bek used with'a single unit or line or which is adapted to ybe used for a three-phase circuit recloser, so that a fault on any phase will open the contacts on all three phases simultaneously to prevent damage'to three-phase equipment, such as electric motors.

Still another object of the invention is the provision of an improved mechanism of the classdescribed, which is simple in construction, durable,

adapted to be used for a long period of time without necessity for repair or replacement of any of its parts, and is adapted to be manufacturedeconomically so as to reduce the cost of the equipment to the consumer.

Other objects and advantages of the invention willy be apparent from the following description and the accompanying drawings7 in which similar characters of reference indicate similar parts throughout the several views.

Referring to the two sheetsr of drawings accompanying this specification,

Fig. 1 is a vertical sectional view taken through the automatic circuit recloser mechanism on Ia plane passing through the axis of the solenoid plunger and the axis of the time delay cylinder; "Fig, 2 is a fragmentary top plan View of the mechanism of Figure 1 in partial section, on a plane passing through the axis of the controlling similar to the upper part of Figure l, with the mechanism in open circuit position in which it has been locked;

Fig. 4 is a sectional View taken on the plane of the line 4 4, of Figure 2, looking in the direction of the arrows, and showing the lost motion mechanism which is located between the manual controlling device and the automatic circuit recloser, one of its positions;

Fig. 5 is a similar view, with this lost motion mechanism in a second position;

Fig. 6 is a. third similar view, with the mechanism in a third position; and

Fig. 7 is a fragmentary horizontal sectional view similar to Figure 2, but showing the mechanism required for a three-phase circuit.

Referring to Figure l, I shall rst describe the automatic circuit recloser mechanism with which the present manual controlling devices are intended tobe used. 'I'his recloser mechanism is intended to be submerged in an enclosed tank 9 in oil, the leads being brought out the top of the tank through elongated multiskirt insulators, the tank being grounded, and separate lightning arresters being provided between the ground of the tank and the conductor at the end of each insulator.

The present device preferably includes a supporting spool i9 for an overload coil II, the spool having a central bore I2 for receiving the substantially cylindrical armature I3. The `assembly is carried by the cover of the enclosing tank, from which it depends. The spool I supports a housing member I4 which includes a cylinder I5 having an inner cylindrical chamber I6 serving as a dash pot.

The dash pot piston VI may comprise a disk I8 having a suitable clearance with respect to the cylindrical wall I6, and having a hub I9 with a bore 20 for receiving the armature I3 to which it is riveted by the rivet 2I. Flanges are extended to form iins 23 which project laterally from two slots 24 in the cylinder wall I5 for supporting a pair of snap springs 25 by means of which the movable contacts are actuated.

The housing I4 also includes a laterally extending, U-shaped portion 26 comprising a pair of parallel walls 2l, and the end wall 29. This U-shaped portion may be open at its top and bottom for access of oil to the contacts. The left wall 39, between this U-shaped portion and the cylinder I5, may be thickened toward the top to provide a diagonally and upwardly extending stop surface SI for limiting the motion of the switch arm. The lower portion of this wall supports a pair of pivot anges 32 for receiving the switch arm 34, which preferably consists of an insulating shield.

The switch arm or shield 34 may consist of a laminated member of indurated ber which is 60 impregnated with a phenolic condensation compound, and which may be a sector, being provided at its axis with an aperture 35 for receiving the rivet or pintle 36 by means of which it is pivoted between the ilanges 32.

The contact arm 34 supports adjacent its upper edge 3l a bridging contact 38. The projecting cylindrical portions 42 of this bridging contact are adapted to engage the xed contacts 44, 44 which are insulated from and supported by the parallel side walls 21, of the U-shaped portion 26 oi housing I4.

The contacts 44, 44 are connected to suitable connectors 46 for receiving conductors which connect the switch in a circuit.

At a point between the axis of the switch arm sector 34 and its periphery 41, this switch arm is provided with a transversely extending spring supporting post 48. The post is preferably provided with a pair of peripheral grooves 49, one adjacent each end, for receiving a loop 50 carried by the end of each spring 25. 'I'he other end of each spring 25 has its loop hooked through an aperture 5I in the ns 23 carried by dash pot piston Il.

Various forms of switch mechanism may be employed, and the one which has been selected to illustrate the invention is merely one of the forms which may be used.

The U-shaped housing portion 26 may have its side wall 2l, provided with an oval aperture 52 extending upwardly from the location of the Xed contacts 44, 44 so that the oil which is projected toward the contacts may pass outwardly toward the right and left through these apertures.

The operation of the switch mechanism is as follows: When the shield 34 is in the position of Fig, l, the iins 23 being below the pivot 36 of the shield 34, springs 25 pull the shield 34 downwardly so that the contact 38 engages xed contacts 44, 44.

As the dash pot I'I moves upwardly, the iins 23 carry the left end of the springs 25 upwardly, and when the ns 23 pass the line or" centers of post 48, pivot 36, and spring attachment 5I, the spring 25 thereafter pulls upwardly on the shield 34, which snaps upward, breaking the circuit between contact 38 and contacts 44, 44. The shield 34 is then interposed between the ixed contacts 44, 44, and it continues upward until its upper edge 37 engages stop surface 3I.

Upon the return movement of the dash pot piston I'I, the closing or the switch is again accomplished with a snap action, and the springs 25 tend to hold the switch closed or open, depending upon the position in which they happen to be.

The piston I8 has a suitable clearance with respect to the cylinder bore I6 so that a predetermined amount cf oil may escape around the edges of the piston Il to permit the armature I3 to move at a regulated velocity.

While the piston Il is moving along the slots 24, oil is projected through these slots toward the contacts of the switch to assist in quenching the arc. The slots 24 terminate short of the end of the piston bore I6 so that after the piston passes the end of the slots 24 the escape of oil from the space above the piston is greatly diminished as it is limited to the oil which escapes between the edges oi the piston and the wall of the bore I5. Thus the upper end of the cylinder is utilized for cushioning the shock of movement of the piston, armature, and associated parts. These parts are also brought to a quick stop.

The armature I3 is carried at its upper end by an extension rod 53, which also serves to support a plurality of valve members. Rod 53 is mounted in a cylindrical socket 54 in the armature I3 and secured by a transverse rivet 55.

Above the armature I3 the rod 53 supports an oil pumping bushing 56 which has a sliding iit in a bore 5l in the housing I4. The oil pumping bushing 56 is secured to rod 53 by means of a transverse rivet 58, and is provided at its upper end with a plane surface 59 serving as a cut-off valve with respect to the transverse conduit or port 60.

The upper casting 6I comprises a metal member provided with a tubular portion 62 having its end wall 63 provided with a cylindrical bore 64.,

The bore L64 lhas a sliding fit with acylindrical portion 6 5 on thefrod 53, `and ythe rod has an upwardly tapered portion `(i6 which .ends .in an abrupt shoulder 61 above, and tapers to the size of the cylindrical portion of vrod 5,3 at the point `68. The locationof these parts is such that when the shoulder 59 closes the port60, the shoulder 61 ypasses the upper surface 69 on thetubular housing 6| and permits the .escape of oil around the `tapered portion 66 of extension rod 53.

The upper housing 6| is provided with a lateral tubular extension 10 which contains the. conduit 60, and may terminate in.l a threaded bore 1| closed by a screw plug 12. This bore may serve as a clean-outopening by removal of the screw plug 12. y' Bore 60 communicates with .afdownwardlyextending port 13 which is closed by aball valve 1.4 which 1permits oil to enter the yport .13 but prevents its exit. A pin 15 abovethe ballvalve 14 prevents the ball 14 from leaving its seat, except for a predetermined movement. .Theconduit 60 also communicates with an upwardly .extending bore 16 which is closed by a gravityactuated ball valve 11, also having a pin 18 to limit its upward movement.

Tubular extension 10 is provided with a circular plate 19 on its upper side, to which is attached another cylinder 80 by means of screw bolts 8|.

The cylinder 80 has an -inner cylindrical wall 82 for engagement with a pistonf83 carried by a piston rod 04. The wall of cylinder 80 `hasan enlarged outlet bore 85 located at a point just below the dash line 86, which indicates the second position of this piston. The dot line 81 below the enlarged outlet port 85 indicatesthe first position of piston 83. At its upper end the cylinder 80 has a small outlet port 88.

Piston 82 and cylinder 89 constitute an integrating or counting device for counting the number of opening operations before the switch is' locked in open position.

The piston rod 99 is provided on its end with a clevis 89 for attachment to a time delay lockout mechanism, and the extension rod 53 is provided with a clevis 90 on its upper end for attachment to a manual operation lever.

The ,tank 9 in which the automatic circuit recloser mechanism is immersed may be provided with a cover 95, which may be secured to the tank 9 by means of suitable bolts or other fastening means. The tank 9 being cylindrical, the cover 95 is also provided with a circular base 96 having a depending drip flange 91 which is located outside the wall of tank 9.

The circular base 96 preferably supports a substantially rectangular housing portion 98, which has a pair of at upwardly projecting walls 99, |00 and a partially cylindricalend wall |02, Figure 2. The other end wall |0| of the rectangular housing-98 extends diagonally upward to the top |03, from the edgeof the base 96 and on either side of the housing 98 and may be the usual circular formations, apertured to receive the insulators which project from the cover (not shown) The walls |00|02 support the integral top |03 of the housing 98, and the housing has an aperture |04 in its side wall 99 for passing the operating shaft |05. Top wall |03 may have a pair of depending bearing lugs |06, |01 (Figure 2) having bearing apertures |08, |09 for the shaft |05. v

The shaft |05 (Figure 2) `supports a lock-out arm V`| l0, comprising a ycast metal member formed with ahub lllhaving a, bore `for the shaft |05, the hub being pinned to the shaft by a transverse rivet or pin |2. The lock-out arm ||0 .has a screw bolt ||3 (Figure l) xedly secured in its free end, the screw bolt ||3 being threaded into the lock-out arm l |0 yand passing through a slot |4 in the lock-out link I5.

Lock-out link I5 is confined on bolt 3 by engaging lock-out arm |0 on one side and by having the head of the bolt ||3 engaging lock-out link |5 upon the other side. The lock-out link I5, as well as switch actuating link ||6 (Figure l) are made of suitable insulating material, such as a rag-filled phenolic stock, so that the mechanism carried by cover is suitably insulated from the recloser located below the links |5, I6'. The lower end of lock-out link ||5 lis pivota-lly secured to clevis 89 by a rivet or screw bolt ||1.

The hub l of the lock-out arm ||0 alsosupports a toggle extension ||8 at a point opposite to the arm H0. Toggle extension ||8 (Figure 3) comprises a flat radially extending member provided with a transverse pin H9, serving as an abutment for a toggle spring |20.

The toggle extension ||8 preferably has a spring supporting portion |2|, outwardly beyond the pin ||9, yfor engagement in the end of the spring |20 whereby the spring is constantly seated on the toggle extension lagainst the pin H9. The spring |20 comprises a `helical coil spring, the end turns of which are vformed into va full circle, and at its opposite end the spring |20 Vis supporte'd upon a cylindrical part |22 of a toggle lever Toggle lever |23 comprises the cylindrical spring guide |22, and also an annular llange |24 against which the spring |20 is seated. Beyond the spring seating ange |24, toggle lever |23 has an axially projecting knife-edge pivot |25, the end of which is seen in Figure 3. The knife-edge pivot |25 is pivotally mounted in a groove |26, which is formed in an inwardly extending lug |21 in the upper right-hand corner of the cover 95 (Figure l).

The initial compression ofthe spring v| 20tends` to hold the knife edge |25 in its groove |26. Suitable stops |28, |29 may be Aprovided above and below the lock-out arm `extension I8 to; limit the movement of this lock-out arm in both directions, for example, when the lock-out arm extension I8 engages the upper stop |28, the lockout arm ||0 is then in its normal Contact closed position, but when the lock-out arm extension H8 engages the lower stop |29 and the ytoggle is in the position of Figure 3 then the lock-out arm is in the position of locking the contacts in open position,-and the toggle spring |20 is holding the lock-out arm ||0 in its uppermost position.

In addition to the lock-out armgl l0, the shaft |05 supports the plunger arm |30 (Figure 2) which is provided with a hub |3| mounted for free rotation on the shaft |05. At its lfree or outer end plunger arm |30 is connected by a screw bolt or suitable pintle |32 to the upper end of insulating rlink I6. The lower end of insulating link ||6 is pivotally connected by meansfof a screw bolt or rivet |33 to the clevis 90 carriedby extension rod 53. f

Theyplunger arm |30 has its hub |3|v provided with the axially extending-segmental'teeth |34,

Figure 2, Afor engaging similar axially extending' segmental( teeth |35, carried bythe hub of lock-out arm l0.` The angular sizel of `the teeth, |34, |35 may be substantially 60 degrees. andi there being four such teeth this leaves 60 degrees' of lost-motion space at |36 and |31 (Figure 5) between the teeth on lock-out arm I l and the teeth on plunger arm |30.

. In other words, there is a lost-motion connection between the plunger arm |30 and the lockout arm l I0, and the plunger arm |30 must move 60 degrees to take up the lost motion at |36, |31 between the teeth |34 and |35 before the plun-ger arm can actuate the lock-out arm ||0. This 60 degree lost motion is sufficient to permit the automatic circuit breaking mechanism, including the extension rod 53, to move up and down to open or close the contacts of the automatic circuit recloser without affecting the lock-out mechanism provided by toggle extension H8, spring |20 and toggle lever |23, which is actuated to the lock-out position by the link or moved back into the normal contact closed position by the same link moving in the opposite direction downward.

. The shaft |05 is preferably provided at its outer end with a shock-absorbing manual actuating means. This may consist of a manual lever |38, which is provided at its outer end with a ring formation 39 for engagement with a suitable clamp stick or disconnect tool.

Lugs |49 and |50 have a suitable clearance between them to permit the leaf spring |43 to bend. Manual lever |38 may have the axially projecting flanges |5| for housing the spring hub |44. The strength of the leaf spring |46 is such that it is strong enough to push the trunnions ||9 and toggle spring |20 from one toggle position to the other, but the leaf spring |43 is not strong enough to hold the toggle arrangement against the action of the lock-out piston during the fourth operation of the cut-out.

Therefore, if the serviceman holds the lever |39 up to effect a closing of the contacts, this will close the contacts except during the fourth operation when the combined force exerted by the lock-out piston and the resistance of the toggle spring will cause the manual shockabsorbing spring |43 to bend farther, and the lock-out piston will move the toggle into lockout position against the force of the manual shock-absorbing spring 43.

, While the operator is holding the manual lever I 39 upward in the contact closing position, the shock-absorbing spring |43 permits the extension rod 53 and plunger arm |30 to move upward to open the contacts, if the overload still exists, after which the opening of the circuit will deenergize the solenoid coils, permitting the closing of the circuit again, and this will be repeated as well if the overload continues and as long as the serviceman holds the lever |39 upward.

I Upon release of the lever |39 by the serviceman the contacts will stay open after the fourth operation, the toggle extension ||8 having then been moved from the upper position of Figure 1 to the lower position of Figure 3, in which the toggle spring |20 holds the lock-out arm ||0 in its upper position.

The operation of the manual control in connection with the automatic lock-out mechanism and the recloser mechanism is as follows: The contacts 44 and 38 of the circuit recloser are closed initially from the lock-out position of Figure 3 by pushing upward on the manual lever |38 at its ring |39 by means of a suitable tool. This moves the toggle ||8, |20, |23 from the lock-out position of Figure 3 to the normal contact closed position of Figure 1, assuming that there is no fault existing on the line.

The angular movement of the shaft |05, which is brought about by this motion of the toggle from the position of Figure 3 to that of Figure l, is sufficient to permit the movement of the plunger arm |30 downward in Figure 1 suiciently to close the contacts.

When the lock-out lever is in the position of Figure 3 the teeth |35 on the lock-out arm engage the teeth |34 on the plunger arm |30, holding the plunger arm |30 upward to such a point that the spring pivot 5|, for the snap spring 25, Figure 1, is above the line of centers 3S to 48, thus keeping the contacts open.

When the toggle has passed to the position of Figure l, however, the plunger arm |30 may descend sufnciently to close the contacts, and this motion may be accomplished by merely raising the manual lever |38 when there is no fault on the line. When a fault appears on the line which results in a large increase of current owing in the coil |I, the armature |3 is drawn upward lifting with it the extension rod 53 and the piston l1, and as the piston |1 rises it carries with it the end 5| of the snap spring 25 which opens the contacts at 38 with a snap action as soon as pivot 5| of the spring 25 passes the line of centers 35, 48.

The piston I1 then ejects oil out of the slots 24 to break the arc between the contacts, and the pump sleeve 55, engaging oil in th-e bore 51, forces a predetermined amount of oil past the ball check valve 11 into the space below the timing piston 83, which is raised to the first line 81 as a result of the first breaking of the circuit.

By the time the cut-off surface 59 of sleeve 56 has passed the port 60, so that oil can no longer pass into the timing cylinder, the shoulder 61 on extension rod 53 has passed the upper end of the bore 64, so that oil in the bore surrounding the extension rod 53 is released through the top bore 64 around the reduced portion 66 of the extension rod.

Each time such a circuit opening is brought about by the actuation of the armature, a measured amount of oil is pumped into the timing cylinder 80, and the piston 83 is successively raised to the levels 81, 86 and 88. There is a large discharge port 85 above the level 81 in the cylinder 8U, permitting relatively quick action of the piston 83 for the rst two operations, but after the second operation this discharge port 85 is closed by the piston 83.

On the third operation the oil above the piston 83 must be discharged through the relatively small discharge port 88, which involves a time delay by dash-pot action so that the operation of opening and reclosing the circuit, if the fault still exists, takes a longer time on the third or fourth operation. f

Many faults which occur on the line correct themselvesvery soon and, therefore, it is desirable to have such faults automatically open the circuit, but if the fault is corrected during the opening of the'circuit it is desirable to have the circuit reestablished at once; thus the present mechanism is adapted to effect a reclosing after the first and second opening, practically immediately.

When any opening of the circuit occurs the solenoid coils Il are deenergized, and the armature I3 tends to drop again by gravity, reclosing the circuit quite soon after it is opened, but after the second operation this reclosing is slower because of the time delay involved by the timing piston 83, which discharges oil from the space above it through a relatively small part B8 foi` the third or fourth operation.

During the rst and second operations, and possibly the third, depending upon the way in which the parts are arranged, the timing piston 83 does not actuate the lock-out arm I |0 because offtheslot ||4 which permits the link ||5 to move upward a predetermined amount without actuating the lock-out arm ||0.

When the lower end of slot |`|4 engages bolt I I3, as, for example, on the third or fourth opera tion, then the timing piston 83 in its further motion raises the lock-out arm I I against the force of toggle spring |20, moving the toggle from the position of Figure 1 to that of Figure 3, where the toggle spring |20 locks the contacts in open position. They are locked in open position because the lock-out arm I I0 has been raised sufficiently so that its teeth |35 engage theteeth |34 on the plunger arm |30, and the plunger arm |30 is held upward in such a position that the contacts at 38 are held open.

The present manual mechanism gives an indication of the fact thatk the contacts are open because the manual lever |38 is down in the position of Figure 3, when the contacts are open. Assuming the contacts to have been locked open, with the parts in the position of Figure 3, the serviceman who sees that they are open, byv means of the position of manual lever |38, may push the lever |38 upward by means of a suitable tool. This moves the parts from the position of Figure 3 to that of Figure l, and permitsv the plunger arm |30 to move downward sufficiently so that the spring 25 moves to the position of Figure l and closes the contacts.

If there is a fault still existing on the line at this time the surge of current through the coils II will raise the armature I3 and extension rod 53, and link IliV will raise the plunger arm |30. 60 degrees of free movement is permitted for the plunger arm |30, and, in addition to this, such additional movement is' permitted as is" necessary by the shock-absorbing spring |43 so that the circuit will again immediately be opened even though themanual lever |38 is held upward.

The mechanism will open the circuit again and again while the manual lever "is held closed, during the existence of a fault, and the contacts cannot be held closed because of the 60 degree lost motion between the plunger arm and the lockout shaft, and because of the additional motion permitted between the manual lever and the lockout shaft by the shock-absorbing spring |43.

After the fourth operation the spring |43 is strong enough to push the toggle arrangement from the position of Figure 3, open circuit, to the 10 position of Figure 1 closed circuit, but spring |43 is not strong enough to hold the toggle arrange-y mentv there, and after the fourth operation if the serviceman releases the lever |38 the contactsY will be locked open with the parts in the position of Figure 3.

Referring now to Figure 7, this shows the manual controlling mechanism for a three-phase installation. In this case all three of the lock-out arms ||0 will be pinned to a single shaft |05in identical angular relation to each other. Then the link I5 on any `phase can rotate its'lock-out arm ||0 clockwise, and all of the lock-'out arms being fixed to the same shaft they will all bey rotated clockwise simultaneously locking out all three phases at the same time. f

It will thus be observed that I have invented.

an improved manual controlling mechanism for automatic circuit reclosers, which has the follOWIlg advantages:

1. The mechanism is adaptable to a single unit or to a three-phase recloser, and when used on the latter al fault on any one of the phases will open the contacts on all three phases simultaneously, preventing damage to three-phase equipment,

2. The mechanism permits the contacts to be manually opened into the lock-out position.

3. When the mechanism is in the open .lock-- out position, it permits the time delay and se` quence operation cylinder to reset itself only to the third or fourth pre-operation position as de-l sired, so that when the unit is reclosed manually on the line, the sequence of operation begins with time delay rather than with an instantaneous operation. y

4. The manual resetting means of this mecha nism is trip-free, whereby, after lock-out, the

contacts can be reclosed manually, but if a short circuit exists the contacts are reopened automatically even though the operator continues to hold the lever in the resetting position.

5. When the contacts are closed. under normal f sire to avail myself of all changes within the scope of the appended claims.

Having thus described my invention, what Il claim as new and desire to secure by Letters Patent of the United States, is:

1. In a manual controlling mechanism for automatic circuit makers and breakers of the type having a time-delayed closing member biased by gravity to closed position and having an integrating device for lifting said closing member after a predetermined number of opening'A operations, the combination of a controlling shaft, krotatably mounted upon a, container cover 'Y and having an end projecting from said cover, a metal hub Xedly secured to said shaft end and carrying a radially extending leaf spring, a handle member rotatably mounted upon said shaft end, said handle having opposing abutments for engaging the opposite sides of said spring, a lockout arm xedly secured to said shaft and having its end connected to said integrating device by a lost motion pin andA slot, a switch controlling plunger arm rotatably mounted on said shaft and having its end connected to said closing member, opposed radial shoulders carried by the lockout arm and by the plunger arm and spaced angularly from each other to permit the arm closing member to move into open or closed position without moving the lockout arm and to permit said handle to move said closing member to open or closed position by moving through an angular range greater than said angular spacing, and lockout means acting on said lockout arm to hold the lockout arm in open circuit position.

2. In a manual controlling mechanism for automatic circuit makers and breakers of the type having a time-delayed closing member biased by gravity to closed position and having an integrating device for lifting said closing member after a predeterminednumber of opening operations, the combination of a controlling shaft, rotatably mounted upon a container cover and having an end projecting from said cover, a metal hub xedly secured to said shaft end and carrying a radially extending leaf spring, a handle member rotatably mounted upon said shaft end, said handle having opposing abutments for engaging the opposite sides of saidV spring, a lockout arm xedly secured to said shaft and having its end connected to said integrating device by a lost motion pin and slot, a switch controlling plunger arm rotatably mounted on said shaft and having its end connected to said closing member, opposed radial shoulders carried by the lockout arm and by the plunger arm and spaced angularly from each other to permit the arm closing member to move into open or closed position Without moving the lockout arm and to permit said handle to move said closing member to open or closed position by moving through an angular range greater biased by gravity to closed position and having an integrating device for lifting said closing member after a predetermined number of opening operations, the combination of a controlling shaft, rotatably mounted upon a container cover and having an end projecting from said cover, a metal hub xedly secured to said shaft end and carrying a radially extending leaf spring, a handle member rotatably mounted upon said shaft end, said handle having opposing abut ments for engaging the opposite sides of said spring, a lockout arm xedly secured to said shaft and having its end connected to said integrating device by a lost motion pin and slot, a switch controlling plunger arm rotatably greater than said angular spacing, and lockout means acting on said lockout arm to hold the lockout arm in open circuit position, said lockout means comprising a toggle lever pivotally engaging said cover at one end, and pivotally engaging, with its other end, a toggle extension carried by said lockout arm, said toggle lever being spring biased out of toggle alignment position, said spring being a coil spring mounted on said toggle lever and compressed between said extension and a shoulder carried by the toggle lever.

4. In a manual controlling mechanism for automatic circuit makers and breakers of the type having a time-delayed closing member biased by gravity to closed position and having an integrating device for lifting said closing member after a predetermined number of opening operations, the combination of a controlling shaft, rotatably mounted upon a container cover and having an end projecting from said cover, a metal hub flxedly secured to said shaft end and carrying a radially extending leaf spring, a, handle member ro-tatably mounted upon said shaft end, said handle having opposing abutments for engaging the opposite sides of said spring, a lockout arm fixedly secured to said shaft and having its end connected to said integrating device by a lost motion pin and slot, a switch controlling plunger arm rotatably mounted on said shaft and having its end connected to said closing member, opposed radial shoulders carried by the lockout arm and by the plunger arm and spaced angularly from each other to permit the arm closing member to move into open or closed position without moving the lockout arm and to permit said handle to move said closing member to open or closed position by moving through an angular range greater than said angular spacing, and lockout means acting on said lockout arm to hold the lockout arm in open circuit position, said handle being hollow and open on one side and having a cylindrical portion rotatably mounted on said hub and side Walls supporting said opposed radial shoulders and enclosing said leaf spring.

JAMES K. HARPER.

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

UNITED STATES PATENTS Number Name Date 1,737,649 Edsall Dec. 3, 1929 2,231,072 Jackson Feb. 1l, 1941 2,414,956 Kyle, Jr. et al Jan. 28, 1947 2,442,477 Wallace et al June 1, 1948