US934573A - Magnetic arc-extinguishing means. - Google Patents

Description

O. A. SANDBDRGH.

.MAGNETIC ARC EXTINGUISHING MEANS.

APPLICATION FILED ma. 4, 1905.

93%573, Patented Sept. 21, 1909.

2 SHEETS-SHEET l Fi g. 7.

' WHNESSES: I f lNvENTOR' f iM/f, ff

ATTORNEY O. A. SANDBORGH. MAGNETIC ARG EXTINGUISHING MEANS.

APPLICATION FILED DEG. 4, 1905.

Patented Sepia. 2i, 1969.

2 SBBETS-SHEBT 2.

INVEMOR Apjplxiqgtmmewww@g, mi swing@ mgm.

. States udvgafresdent, legheny, and

mitral Q inY anna: zahlte fsu as: ,mes Damned I fs'x th@ protcion Lof @multiple switch con- 4imo); sys'mpluvolivng a plurality of? circuit 60 interrupting, v

E circ-mts at jzfmquent. intervals tra ha drfsfw cated in the' air-gaps formed between the pole pieces and the several intermediate mag net members contact arm Q9 and `stationary terminal members 2G and Qt' which are attached to the frame l by bolts by washers and bushings (see Fig. l). The

` stationary terminal member 26 is provided with an arcmf' terminal piece QS, the extremity of which is located directly in the magnetic circuit which is provided as indicated above. The movable contact arm .29 is pivotally mounted upon the stationary member 2T and is provided with a contact piece 30 which is movably connected thereto and corresponds to the Stationary terminal piece Q8 .with which it may engage, when an electric circuit is completed from stationary member 27 through the movable arm 29, to the stationary member 26. The contact piece 30 is connected to the stationary member 2T by a tiexible shunt 3l, so that the' resistance is reduced between the members and its motion about the pivot 32, upon which it is mounted, is limited by a connecting 'rod one end of which is attached to a pivot 3-'1- the center line of which is slightly removed from that of the pivot 32. and the other end of which is longitudinallyv movable in a bushing with which the arm 29 is provided. The terminal piece 30 is rotated about the pivot 32, as far as the connecting rod 33 will permit, by a compression spring 3G. The terminal piece 30 is moved into and out. of engagement; with the terminal piece QS by a connectingl rod 3T which acts upon the movable arm it) and receives its motion from a piston $38 with which it is connected. The piston 3S located in a fluid-pressure cylinder 3D and normally holds the circuit interrupter in its open position-by reason of a compression spring ltlwhich interposed l between one, end otl the cylinder and the piston. The switch may bev closed by the action of fluid-pressure thaty is admitted into the cylinder by a 'alve' 4Q thc operation of which is governed by an electro-magnet l1. The extremity of the terminal piece Sl() moves into engagement with the terminal piece 2S iirst and as the two'memlurs are separated, circuit is tinally broken at this point by reason ot' the' action ot' thc spring 3h. already explained. The extremities ot the terminal pieces "J8 and .tl a re separated slightly from each other whqli the .switch is completely closed, .so that ronghcning ot such extremities by arcs will not prevent perfect engage ment of the main portions i surfaces.

In order that thc several switches may be electritailly interlocltcd, relay switches are. provided, each of which comprises a contact carrying arm t3 that is pivotally mounted, near its middle point, upon a .stationary pro jcction stt which is supported l'rom the frame g and are insulated therefrom f ot' the contact and each comprises a movable 1 and stationary engaging contact fingers 47.

011e extremity of the arm 43 is slotted to engage a pin 4:5 on the connecting rod 37 so that the motion of the connecting rod i1niarts of a rocking motion to said arm. The outer extremity of the arm 113 is provided with contact pieces 4G which engage the stationary contact fingers 4T.

The stationary members 26 and 27, together with the movable arm Qt) of each switch, are surrounded by a box 48 of insulating material, which is similar to and is assembled between the boxes 25 in which the magnetizable core members are located. By4 locating the. several switch members and the various core members in separate boxes, any one may be readily removed and replaced in case oi" accident to its parts, which is of decided advantage. particularly in railway vehicle service. The magnet coils 2, 3, 4, 5, T, S, t) and 10 may preferably be wound with comparatively large size strap conductor of relatively t'ew turns so that the resistance ot the windings connected in series is comparatively low and may be included in the motor circuit without appreciable loss.

In order to support the series switches and their parts, the frame 1 must have considerable section of material which adequately serves as a return circuit for the linx induced by the several magnetizing coils, and although the magnetic lines may be considerably scattered through the return portion of the circuit. they will obviously be concentrated at the pointsl of circuit interruption so that relatively large currents may be flowing through the circuit at the time ot interruption without. materially damaging' the contact terminals, .since the arcs, which would otherwise occur to a greater or less extent, are extinguished' in accordance with well known principles.

lt is sometimes desirable to protect certain ot thc circuit interrupters-independently on account of the necessity for reversing the current: therethrough, and in that case, an intermediate projection of magnctrizable matcrial,'such as projection 1Q, which is provided with pole pieces :9.2 and 15, may be introdtwed between the end projections ll and 13. li'hen this project-ion is introduced, as lshown in Fig. 3, the magnetizing windings Sl and 10 are connected together and in series with the interrupter which is located between them anda magnetic circuit; is induced through pole piece 16, project-ion 13, a portion ot' yoke l, projection l2 and pole piece 15, while the main magnetic linx produced by the windings Q, 3, 4, 5, G, 7 and 8 passes through pole piece 14 and intermediate inagnet men'ibers 17, 18, 19, 2O and 21, pole piece 29, projection 12, yoke l and the projection 11. With this arrangement, it is possible to protect an interrupting device which may be located in the air-gap between magnetic lll() spirit `of my invention shall be included` essere -the windings 2, 3, 4, `5, 6, 7- and 8.

Although I have illustrated and described my invention in ,connection with a multiple switch group, such as is employed for the 'control ofiailway Vehicle motors, it is not restricted thereto and may be advantageously applied for the protection of circuit interruptingdevices in' eneral, and I desire' that variations which o not depart from the within its` scope. y

Iclaini as my invention:

'- 1: In a controllerfor electric circuits, the

combination with a plurality of independently actuated and electrically controlled switches, comprising aseries of stationary contact terminal members and corresponding movable contact members, of means for eX- tinguishing electric arcs atthe terminals of, the Contact members said means comprising n plurality of magnetizable members severally located between adjacent switches, a series of niegnetizing windings for said mem bers and a suporting frame forthc various switch parts w ich constitutes a return inagnetic circuit. l y 2. In e controller for electric circuits, the

` combination with ay plurality of independeiitly actuated switches each of which coinprises estationary contact member, a movn able member hinge-connected thereto, a second stationary Contact member, a'terminal member yieldably connected to said movable memberand adapted to engage the second stationary member, a fluid-pressure cylinder,

a piston in said cylinder and a connectingrod havingy its extremities attached, respectively, to the movable member and to the piston, of means for extinguishinhr electric arcs at the terminals' of the Contact members, said means comprising a plurality of magi netizable members severally located between adjacent switches and near their terminals, a. series of magrietizinnl coils which surround the magnetizable members and induce a magi;- netic field therein and ay supporting 'traine for the variousswitch parte which constitutes Li return circuit for the magnetic flux induced by the magnet coils. A.

I3. ln n control system for electric circuits, the coml'iination with a `plniility of interrupting devices comprising' stationary contact members and movable contact members -adapted to engage said stationary members, of means for extinguishing electric arcs at the terminals of the contactmembers said` means comprising a. plurality of magnetizable members severallylocated between adj acent switches and near their terminals, a series of magnetizing coils which surround the inagnetizable members and induce a magnetic eld therein and a. supporting frame `for the various switch parts which constitutes a return circuit for the magnetic linx induced by the magnetcoils. l

4. In a controller for electric circuits, the

vcombination with a plurality of independently lactuated switches comprising a stationary contact member, a movable member hinge-connected thereto, a second stationary contact meinben, a terminal member yieldably connected to said movable member and adapted to engage the second stationary memberfa i' Hui d-pressure cylinder governed by in electricallyactuated magnet valve, a

piston in said cylinder and a connecting rod,l

the extremities of which are attached respectively to the movable iiicinber-aiid' to the piston, a. contact-carrying arm pivotally mounted near its middle point, one extremity being so connected to said connecting rod by a lost motion connection that the motion of the connecting rod produces a rocking niotion in said arm, contact pieces mounted uhon the Ophosiie ,Phd or' thc arm and insu lated therefrom. and stationary lingers that engag'esaid ieces. of means for extiiiiguishing electric arcs at the terminals of the contact members said means comprising a plurality of inannetizable members located bctwecn the several switches near their terminals. a series of nmgnctizingr. coils which sui'- roniid the iimgnetizablc members and induce a magneticlield therein, and `a supporting; irnine for the various switch parte which constitutes a'i'clulii circuit 'tor the magnetic linx induced by the magnet coils.

lnieslimony whereof. l have hereunto subscribed my naine this 29th dayof November, lill-)5.`

OL() l? A. SA N DBORtli-l.

lVitiiesscs:

llfownnn li. Busen, Binner' lliivics. v

Images