US1099332A - Circuit-breaker. - Google Patents

Description

O. AALBORG. CIRCUIT BREAKER.

APPLICATION FILED JULY 3, 1955. 1,099,332. Patented June 9,1914.

2 SHEETSSHEET 1.

I b F n! GA KW L- U ATTORNEY O. AALBORG. CIRCUIT BREAKER. APPLICATION FILED JULY 3, 1905.

- Patented June 9, 1914.

2 SHEETi -SHfiET 2,

- operating handle,

The bracket 2 comprises the panel '1 by bolts 1 CHRISTIAN :AALBORG, 0F WILKINSBURG,

PENNSYLVANIA, ASSIGNOR TO WESTING- HOUSE ELECTRIC 86 MANUFACTURING COMPANY. A COBYEOBAI'ION OF PENNSYL- VANIA.

CIRCUIT-BREAKER.

Specification of'Letters Patent.

Patented June 5?, M91 4;.

Application filed July 3, 1905. Serial No. 268,266. v

To all whom it may concern Be it known that I, CHRISTIAN AALnono, a citizen of the Unit-ed States, and a resident of \Vilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement-in Circuit-Biteakers of which the following is a specification.

My invention relates to circuit-breakers, and it has for its object to provide a handoperated and automatically released circuitbreaker with means for preventing the holding of the breaker in its closed position under overload or other predetermined conditions, that shall be simple in construction and effective in operation and that shall not interfere with the normal operation of the breaker The circuit breaker of my invention is providedwith a special construction which prevents it from remaining in its closed po-' sition under overload conditions, even though a retaining'foree be'appliedito the so that protection of the circuit and its-translating devices is insured and is dependent only upon-the automatic tripping device.

A further advantage of the breaker of my invention lies in the fact that it'may be hand-operated under normal conditions to open and close the circuit, at the will of the operator.

In the, accompanying drawings, Figure 1 is a side elevation and Fig. 2 a "front elevation of a circuit-braker constructed in ac cordanoe with my invention and shown in closed position. Fig. 3 is a side elevation of the circuit-breaker shown in Figs. 1 and 2, the movable member being shown in its open position. 1 v I Although my invention is shown only in connection with a breaker which is autornatica l'y released -under overload condi tions, 1t. may

be applied to breakers which are adaptedfor operation under other predetermined conditions.

The principal stationary parts of the circuit-breaker illustrated are a non-conductin a main contact terminal bloek 3, an arebreaking terminal block t and a: conducting stri or p ate- 5 between the blocks 3 and 45.

a pair of substantially parallel plates 2 that are secured. to

and project outwardly slab or panel 1, a supporting-bracket 2,-

thercirom. Pins 9,15 and 25am so supported by the plates 2 that they are parallel to the plane of the slab l and serve as axes for the movable parts of the 'lu'eakcr. A two-part lever S is pivotally mounted near ouc end on the pin 9 and is provided with a pin S at its outer end which ties the two parts of the lever together and supports main and auxiliary contact-bearing members 7 and ll that are mounted thereon. lhc member '7 is prevented from rotating about the pin 8 as an and the member ll is limited in its rotation about the same axis by a pin 13 which passes through a projection for the former and through a relatively large hole 12 in the latter. 3 A. spring ll is interposed betwee-uzthe members 7 and 1,1 in order to tilt the auxiliary clontact-hearing members forward when the breaker is open.

An operating handle 'l-Il: is attached to a double forked operating lever 14F which is pivotally mounted, on studs or rivets 15 by which its outer prongs are attached to the outer extremities of the bracket plate 2.

he inner prongs of vthe lever 14 are materially longer than the outer prongs and are connected with the pin 8? at the extremityof the lever S by means of :1V link 16 and a. pair of shorter parallel links 17 and 18 which are constructed to act as a single connecting link under normal conditions and to assume the position shown in Fig. 1 when the breaker is closed and that shown in 3 when the breaker is open.

A laminated currmt-carrying contact member 6 is attached to the member 7 and is resilient by reason of its structure so that it will compensate for a certain wear which occurs on the contact surface.

An auxiliary contact member 10 which be constructed of carbon or other suitable material is adapted to coiiperate with" the stationary are breaking contact member 4. .A conducting: plate 10* is attached to the member 10 by means of a hollow rivet or stud '10 and 'is' supported, adjustably atseat itself when it engages the stationary member loo t'aehed. to the member 11 by side projections ais The links 17 and 1 are connected to the extremity of the handle lever itat one end by a pin I l and. at the other end are coir ncctcd to substantially the middle point of thc liuk 16 by a pin lb. The tree end of the link 16 is provided with a. p1ojection, ll, that may be engaged by a portion ol the tripping mechanism, and with a pr jection 2) which normally engages the connecting pin l-lr by which the l nks 17' and l9 are attached to the operating lever ll.

The, tripping nmchauism comprises a framc'Q'l, upon. which is adjustably mounted a wcig'l'lt Q2 and to which a U-shaped armature 23 of magnetizable material is at: tached. The frame 91 suspended from a tripping lever 2-1, that is rotatably mounted upon a pin or rod 3 with which the sup porting bracket 2 is provided. it magnetizing winding is coiled ab ut a magnetizas blc core 27, which surrounds the shaft 9.

The inner end of the coil or spiral is electrically connected with the side plates 2 of the bracket. by means of the bushing or core 27 and its outer end is connected rectly (as shown in Fig. l), to a main terminal stud 7 of the breaker. It will be observed that when the breaker is closed an electric circuit may be established from stationary contact member 3 through movable member 6, shunt (3, bracket plates 2, oushing 2'? and the coil 26 to terminal i hen the current flowing through the circuit exceeds a predcterniined amount, the armature 23 is attracted by the core I? and the free end of the trip1')ing lever 21: is moved into engagcmcnt with he projection 19 01 the connect ing link 16. When this occurs the breaker is thrown, by a spring 28, to the position indicated by broken lines in Fig. .Vhen the breaker is closed, it is retained in this position normally by a projection 29 which is attached to the handle lever and engages the pin on the bracket 9., since the pivot pins 14; and 16 are substantially in the same straight line. When the breaker is operated by hand to open the circuit, the lever 16 and the connecting links 17 and 18 retain the same relative positions, while the joint bc tween the links 17 and 18 and the handle lever 14* is broken to form an acute angle, as shown in full lines in Fig. 3.

When the free end of the tripping lever 24 is brought into engagement with the projection 19 of the link 16, the joint between the connecting links 17 and 18 and the link 16 is broken, as well as the joint between the links 17 and 1S and the handle lever l t", and the breaker assumes the position indicated by broken lines in Fig. 3. It is obvious that if the handle is held in. the position shown in Fig. 1, it will not prevent the opening of the circuit by the tripping mechanism.

I desire and intend to include within the.

scope of my invention all variations from 'ot' said links to release said switch member independently of the operating lever.

, Q. in a circuit-tncaker, the combination with a movable switch member. an operating lever tulerumed at an intermediate point in its length, and a connecting and locking means between the switch member and one end of the operating lever, which comprises a relatively long link and a pair or short links, of means -tor engaging the free end of the long link to open the circuit-breaker independently of the ope ating lever.

23. in a circuit-breaker. the combination with a movable switch member, an operating lever tulcrumed at an intermediate point in its length, a relatively long link connected to the switch member and a pair of short links between one end of the operating lever and an intermediate poi ut in the long link, of automatic tri iiping means which is dependent'upon predetermined circuit conditions for engaging the free end of the long link to open the circuit-breaker independently of the opera ting lever.

4-. Tn a circuit-breaker, the combination with a movable switch member, an operating lever fulcrumcd at an intermediate point in its length, a relatively long link connected to the switch member and a pair of short links between one end of the opcrating lever and an intermediate point inthe long link, of an electromagnet which is responsive to predetermined conditions in the circuit, and an armature for tripping said links to open the circuit-breaker independently of the op crating lever.

5-1n a circuit-breaker, the combination with a stationary contact member, a movable member provided with a laminated contact terminal and a resiliently supported arcbrcaking contact terminal, an operating handlc and an automatic tripping mechanism,- of means for connecting the movable contact member and the operating handle lever to:

gether, said means comprising a long link having oncend pivotally connected to the movable contact member and a pair of parallel links pin-connected to said long link substantially at its middle point and also pin-connected to one end of the operating handle lever.

in a circu t-breaker, the. combination with a stationary contact member and a supporting bracket, :1 morable contact member, a tripping device and an operating handle pivotally mounted upon said bracket, of means for mechanically connecting the mo\' able contact member and the operating handle together, said means comprising a long link which is'pin-conneoted at one end to the movable contact member and a pair of par- 10 allel links which are pivotally mounted upon one end of the operating handle and are pin-connected to said long link substantially at its middle point.

7. In a circuit breaker, the combination 15 with a movable switch member an operating CH'THSTIAN AALBORG.

LID

Witnesses lVM. BRADSHAW, BIRN'EY :EIINES.

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