US1934518A - Arc horn - Google Patents

Description

Nov. 7, 1933.

ABC HORN Filed May 6, 1931 film [555. INVENTOR A. o. ANDERSON. 1,934,518

P atente& Nov. 7, 1933 some . eri'ielil lineal-son, Wilkinsburs, Pi :1 or

eetlosi horns of the eosiveovioosl type constructedoi one "solid nemfcer utilized. in connection With an electric switei' provided with on ere chute and as magnetic blowout coil, the established by the opening of ccntaet members Teecomes very much distorted and uncontrolled as it is megnetlcelly of this with Ellen ja-cent sequei tly tive out -ecessitetes time frequent replecemen oi entire ere chute.

Moreover, it lies found, under certain conditions, the ere. it is magnetically blown me are looms. travels the entire length. of t re 1102. tlience orcuiicl their ends along" reverse sides thereof towards the contact memlseis. This, likewise, causes excesslve burning only of the too bottom portions of the em chute of other ports, such the parts oi t e switch.

An object of invention is provide an arc horn tltet shell be simple eirio'i relieli-le in oper etion encl lee r eelily also; economically menoiee turecl anal i A more speoinc object of my invention is to provide on are item that controls the ere, es is magnetically blown from the contact members oi. the switch by the magnetic blowout coil, theretlie are lolovm into contact ion o the ore chute which eelsides of the are items, end, conby preventing excessive burning of the e-rc'cliute and of other parts, such. as adjacent parts of the switch.

.lnother object oi my invention is to provide en are born, which, when the are current is flowme" through it, shall establish. e loos-l flux to direct the sec lmmeoietelv to the centre]. region. of its end portion.

it is also an object of my invention to provide so are item, which, when the ere current is flowing through it, establishes 9, local flux for mainteiriing the era in the central region of its end portion as long as the ere continues to flow.

Other objects of my invention will hereinafter become apparent.

For 2. fuller me erstandmg oi the nature and further objects of my invention, reference should be heel to the following detailed description, taken in. eermection with the accompanying drawing, in which:

Figure l is a. side view oi an electric switch prolclotm upontlie are loorns- As result.

estimglmose Electric & Manufacturing 113/. e east-emotion of Pennsylvania.

e, test. Serial No. tassel (erase-err) video with an arc chute, parts being cut away to show the manner in which my invention may lee epplied thereto.

Fig. 2 is an enol view of on electric switch, such as that shown in Fig. l, to which my invention. may be applied. m

Fig. 3 is aside view of so are horn embodying the features or" my invention and. in soldition, it illustrates the clireetion oi the flux oredueed by on are entering one of the spaced members of the are homo Fig. 4 is eiront view of on loom embody ing the features of my invention. end illustrates the direction of the flux produced era are entering time central region of the end portion.

5 is e perspective view o. ere item embodying the features of my invention, end lllustrates the direction of the flux Ioroolucecl by an are entering one of the soocecl members of the ere hero.

Zn order to accomplish, broadly, the detects of my invention, 1 provide on ere-hero construc tion, such that the are current, entering the are horn, is disposed to trevel in multiple paths through the horn, es the era is etieel- 1y blown from the Contact members of e switch. In this manner, local flux (see Figs. 3, t and ii) is established about the are born for controlling the ore, and therebyeventing the are from burning the chute oral 1e other soieeent of the switell.

Referring now to 2 end 52 I the reference chat ere ill 22,216 ll ole re; tact members of a. switch to which may be epplieol. [is shown, a. lower 2. are horn, embodying? the totes r g luv and designated, respectively, oy eliarscters 29 end 2 1, ere disposed; in front of, or erljecent to, the contest ere. The switch is also provident. with en climate having magnetic pole l5 and it mounted on the opposite slates thereof. e feces are connected Ely means of e. yoke i? and. are time netized of opposite polarity by means of e. mag-- netic blowout coil, (not shown).

As best shown in Fig. 5, the era horn com prisese unitary structure having two SlllIlStEiXl tlelly parallel spaced members 23 and 24, stip-= ported. encl integrally joinecl at one pair cl ends by means or" a, base portion 22 end integrally joined at the other pair of ends by means of e. cylindrical portion 25.

In explaining the action of the local flux which controls the ere. it may be assumed that an arc is established between the upper end the lower are horns and that it is travelling along one of the spaced members away from the contact members of the switch. Referring to Figs. 3 and 5, which show an are entering the spaced member 23 at a point designated by the reference character 26 and representing, generally, any point at which the arc may enter the spaced members of the arc horn.

Since the spaced members 23 and 24: constitute a multiple path, the arc current divides when it enters the arc horn, part flowing directly to the base portion through the spaced member 23 and the remaining part flowing indirectly to the base portion, through the cylindrical portion 25 and the opposite spaced member 24. It will be ob served that the arc current produces a local flux about the arc itself and also about the spaced members and the cylindrical portion, part of the latter precedes the are as it travels towards the end portiom As shown in Figs. 3 and 5, the general direction of the local flux that precedes the arc is upward in the region between the two spaced members 23 and Ziand downward in the region on the outside. Also, the general direction of the flux produced by the arc itself is opposite to that of the local flux in the region between the two spaced members, and is the same as that oil the local flux in the region outside oi the spaced members.

The effect oi this is to produce a weaker held in the region between the spaced members than on the outside, and, consequently, a resultant force is produced that causes the arc to travel along the inner edge of the spacedmember as it approaches the cylindrical portion Since the local flux about the arc and the local flux about the member 23 of the are born preceding the arc act opposition, whereas the opposite is true with reference to the local arc flux and the flux following the are about member 23, a weal: field precedesthe are and a strong field follows the arc, thereby driving the arc, toward the end portion 25, and the are, in this travel, at all times strikes the inner edge oi member 23. From the foregoing considerations, it is apparent that invented are horn causes the arc to be extinguished much more promptly than -it is normally extinguished by the conventional type of arc horn, because it aids the flux produced by the blowout coils in magnetically blowing the are from the contact members of the switch.

After the arc stream has reached the central region of the cylindrical portion (see Fig, ill, the local flux becomes balanced; that is, the field strength is the same on each side of the are. This has the desirable effect oi maintaining the arc in the central region of the cylindrical por-- tion as long as the arc continues to flow. Ii, for instance, the arc, by some external means, is iorced to one side oi the central region, an unbalanced flux situation is immediately established that forces the are back until the flux becomes balanced again. By reason of the local flux preceding the arc, in combination with the flux set up by the arc itseli' and by the magnetic b1OW-0lll3 coil, the are is constrained to travel at all times, and particularly as the arc approaches the tip of the are born, on the top and especially the in" nor edge oi the side members. Also, in the event that the arc is not extinguished before it reaches the cylindrical portion, the arc is constrained to rotate, partially or completely around the cylindrical portion until it is extinguished.

Thereiore, it is apparent that I have disclosed an arc horn which controls the are as it is blown from the contact members of the switch, thereby preventing excessive burning of the arc chute and other adjacent parts of the switch.

Since certain changes may be made in the above-described construction, and diiierent embodiments of the invention may be made without departing irom the scope of the invention, it is intended that all matter contained in the above description, or shown in the accompanying drawing, shall be interpreted as illustrative and not in a limiting sense.

I claim as my invention:

1. An are horn that is disposed to be operated in conjunction with a circuit interrupting device having relatively movable contact mem bers and a magnetic blow-out coil for transferring an are from the contact members to the arc horn comprising a base portion and projecting spaced members having their forward ends integrally connected together and their rear ends integrally connected to the bwe portion, said spaced members being disposed in a side' byside relationship with respect to each other, and the portion where the forward ends oi the spaced members are integrally connected together being so shaped and so positioned relatively to the are that "the flux caused by the arc itself, in combination with the flux set up by the magnetic blow-out coil and by the current flowing through the spaced projecting members constrains the are to travel. on the inside portion oi the spaced projecting members and to rotate about the portion where the forward ends of the side merm bers are integrally connected together.

2. tin are horn that is disposed to be operated in conjunction with a circuit interrupting device having relatively movable contact mo :ers and a magnetic blow-out coil for transferrin are from the contact members to the arc horn 3 comprising a base portion, a cylindrical portion,

projecting spaced members integrally connected at their forward ends by the cylindrical portion and at the rear ends by the base portion, said spaced members being disposed in a sideby-side relationship with respect to each other, and the cylindrical portion being positioned so stantiully perpendicularly with respect to the are so that the flu): caused by the arc in combination with the flux set up by the magnetic blow-out coil and by the current flowing through the spaced projecting members, constrains the arc to travel on the inside portion of the spaced projecting members and to rotate about the cylindrical portion.

3. An arc horn that is disposed to be operated in conjunction with a circuit interrupting device having relatively movable contact members and a magnetic blow-out coil for transferring an are from the contact members to the arc horn comprising a base portion, a cylindrical portion, and projecting substantially parallel spaced members integrally connected at their forward ends by the cylindrical portion and at their rear ends by the base portion, said spaced members being disposed in a side-by-side relationship with respect to each other, and the cylindrical portion being positioned substantially perpendicularly with respect to the are so that the flux caused by the arc itself, in combination with the iluz-r set up by the magnetic blow-out coil and by the current flowing through the spaced projecting members, constrains the arc to travel on the inside portion of the spaced projecting members and to rotate about the cylindrical portion.

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disposed in a side-by-side relationship with respect to each other, and the cylindrical portion being positioned substantially perpendicularly with respect to the are, so that the are may rotate thereebout.

ARNGLID Q, ANDERSON.

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