US1030568A - Circuit-breaker. - Google Patents

Description

H. W. CHENEY.

CIRCUIT BREAKER.

APPLICATION FILED FEB. 1, 1911.

1,030,568. Patented June 25,1912.

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HERBERT N. OEENEY, OF MI LXVAUKEE, WISCONSIN, ASSIG-NGR TO ALLIS-CHALMERS CDMPANY, A COBTPORATION O1 JERSEY.

CIRCUIT-BREAKER.

roac es.

Specification of Letters Patent.

Application filed February 1, 1911.

Patented June 25, 1912.

Serial No. 605.853.

there is tendency to lock or bind the latch of 'sumes considerable energy.

the tripping mechanism thereof, so that considerable energy is necessary to release it. ll this energy is furnished directly by a tripping coil, the latter must be fairly large, whereby it is rendered expensive and con- Moreover, in

. large circuit-breakers a direct-acting trip.

coil is not entirely reliable.

It is the object of my invention to improve the tripping mechanism of circuitbreakers. The trip coil trips the circuit breaker through an intermediate energy-storing device, thctrip coilreleasing the energ storing device, and the latter then acting on the latch of'th/trigiping mechanism of thc'circuit-breaker to trip it. The energystoring device is reset by the next closing movement of the circuit-breaker,the resetting means for" the energy-storing device preferably being identical with the latch which holds the. energysto'ring device in its energy-storing position and 15 released by the trip coil.

out in the claims.

My invention is particularly adapted to the oil circultreakers commonly used for "large currents r high voltages.

The various novelfcat-ures of my invention will appear from the descr ption and drawings and will be particularly pointed The two figures of the drawing show semi-diagrammatically the closed andcpen positions respectively of a circuit-breaker" constructed in accordance' vith invention.

The handle.

is attached to one sun of a toggie 11., the other arm 01": which is attached bell-crank lever 12 and an arm of another toggle 11, and the other arm of this toggle is connected through a second hell-crank lever 15 to the movable contact of the switch 16, which is biased to open position as by a spring 17. This switch is'shown diagrammatically as a two-pole switch immersed in oil in a tank 16*, but it may have any desired number of poles and be of any desired construction. The operating mechanism also is capable of wide modification.

Connected to some suitable point on the op rating mechanism, as to the bell-crank lever 15, is a pawl 18 which cooperatcsnvith a pin 19 on a weight or hammer 20. This hammer s pivoted at any suitable point, as

at 21, and may be limited in its movement by arms 2 and 23. The pawl 18 may be separated from the pin 19 by an extension 24 from the core 25 of an overload coil 26, the latter being connected in any suitable manner so that it is responsive tothe current passing, through the switch 16.

The switch may be closed by moving the switch 10 from the full line osition shown in'l ig. 2 to the full line position shown in Fig: 1. This cramps thetoggle 11, turns the bellcrank lever 12 in a counter-clockwise direct-ion, almost straightcns the toggle l l, and raises the switch 16 from open to closed position. At the same time, through the engagement of the pawl '18 and pin 19, the hannner 20 is moved from the full line position shown in Fig. 2 to the full line position shown in Fig. 1. The center of gravity of the hammer 20 is still to t-heleft of its pivotalpoint. The various parts remain in the fullline position shown in Fig. 1 because of the cramping of the toggle 11.

Upon an overload, tic coil 26 raises its core 2'5, and'the extension 24: lifts t 1e pawl 18 to'. separate it from the pin 1.. The hammer 20 immediately falls fromthe position shown in Fig; 1 to the position lshowh inFig. 2, striking theoxtension 27 of the latch.13 and'releasing the toggle 14 from said latch. The spring 17, which at this time is under; tension, immediately-movesthe toggle 14, the bell-crank lever 15, and the switch 16 from the closed position shown in Fig. 1 to the open position shown in Fig. 2, but does not interfere with theposition of tnc handle 10, the toggle 11, and the bellcrank lever 12. To reclose the switch, the

menses eleasing said 50 handle 10 must first he moved to the full I responsive to an overload for line position shown in Fig. 2, wherenpon the releasable connection latch 13 again engages the toggle 1% and, In an automatic c.1i'cn1tl)i'eal e1', the allows the switch 16 to he closed by a proper l-coinbination switch contacts, operating movement of the handle 10. lit the same i mechanism for the switch including latch time that the latch 13 engages the toggle for holding itin closed position, an ene 'g 55 1 the pawl 18 ei'ig' ages the pin 19, so that storing device which when teieased loan by the closing of the switch 16 energy is energysto 'ing condition releases said latch stored in the hannnci- 2'0. Should the overl to allow the opening of the switch, ac-ans operating to release said latch when said load still exist, the pawl 18 is again lifted l operated. by the closing of the switch innnediatcl and the hammer 20 again tails l putting said energy-storing device in one? to the left to separate the latch 13 from the storing condition andmechanically depe toggle ll and allow the switch to he opened. cnt upon. the closed condition Offll'lO switch It is thus impo sihlc-to maintain the switch I ioi' holding said device in such condition, in closed position during the continuance and ineans for releasing said energy-storing of an overload dei iice from said holding means.

Whilc i have shown my invention as narf 4'. In an automatic CllCUlD-l)l61l-Il', the ticularly applied to a non-closahle ciixa lconihination oi? switch contacts, operating breaker, in which type of Cll'ClllidHCHliQl I l mechanism for the switch including a latch l l r prefer to use it, its ln'oad features are capafor holding it in closed position, an energyhle of use in any type of circuit-breaker stoi'ing'device which when released from 70 whatsoevon i l/Ian modifications may he cneigy-stoi-ing condition releases said latch made in the precise arrangement shown and to allow the opening of the swit l described, and all such which do not in olve operated by the closing of the s a departure from the spirit and scope of my putting on intention I aim to cover in the following Stfln COlhilli'lOTl and mechanically (lGD'QIl'Ql- 7,5 claims. out upon the closed condition of the sn ch lVhat I claim as new is: tor holding said device in such condition, 1. in an automatic circuit-breaker, the and means responsive to an overload for combination or" switch cont Opfllljliig i'cl said energfpstoi'ing device from mechanism for the switch inclnc holding means. 80

o. in an. automatic circuit-hi.'ealter, the.

ans Mich for i'gy-stoi'ing device in energyling a latch for holding it in closed position, an energy storing device i'eleasahly connected to the' switch-operating mechanism, said energyl l l l l {combination of switch contacts, opei atino' l mechanism for the switch inclndir storing device being put in enemy toring for holding it in closed position, an l 1 l l i condition by tile closing of the smith and storing device releasahly connected to he 8 operating to release said lat h when said si iljcli operating mechanism, said 2511619'3 i-cleas: hie comiection is released, and means storing device being put in energy storing for releasing said releasable connection.

2.11] an automatic circuit-hi*eal;e1', the

, condition by the closingof the switch and operating to release said means when said combination of switch co ta ts, o er ti g releasable connection is released, a'nd means so mechanism for the switch including a latch .to releasing said releasable connection. for holding it in closed position, an energylililwankee, El is, Jan. 26, 191.1. storing device :cleasahl connected to the In testimony whereof I afllr; my signature, switch-0perating mechanism, said 1161gy l in the presence of two witn storing device being put in enci toning;- l HERBERT s3 UHEIIEY.

condition by the closing; of the st tch and ll itnossesz (Inns. L. Byaon,

releasable connection released, and ineans Ron. ii. SJQLL.

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