US258466A - Michael j - Google Patents

Description

(No Model.)

M. J. OSULLIVAN.

- ELECTRIC ARG LAMP.

No. 258,466. Patented May 23, 1882.

` NA PETERS, Phum-Limognphar. Wuhngmn. D. C.

g UNTTED STATES PATENT CEETTTEO MICHAEL J. OSULLIVAN, CF BALTIMORE, MARYLAND, ASSIGNOR TO THE AMERICAN ELECTROPHORE COMPANY, OF IVASHINGTON, l). C.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 258,466, dated May 23, 1882.

Application filed December 19, 1881. l(No model.)

To all whom tt may concern Be it known that I, MlcHAEL J. OSULLI- VAN, of the city of Baltimore, in the countyot' Baltimore and State of Maryland, have invented a certain new and useful Improvement in Electric-Arc Lamps; and I do hereby declare the following to be a full, clear, and exact description ot' the same, reference being had to the accompanying drawings and the letters of reference marked thereon, forming a part ot' the same.

In arc lamps as at present constructed the lamp-frame, and the horn as well when one is used, are in electrical connection with the carbon-holders. A lamp ot' this kind is dangerous to handle, and is often the occasion of serious accidents.

The object I have in view is to remedy the above-named defect, and also to accomplish this object without necessitating material changes in the form or construction of existing types of lamps. To this end I combine with the lamp-frame a lower-carbon holder which is insulated from the frame, and an insulated covered connecting-wire leading from the proper lamp terminal to said holder. I thus isolate the frame from the lower-carbon holder and its electrical connections and render it perfectly sate to handle. I also combine the upper or movable carbon rod or holder and the horn which surrounds and receives the upper end of the same in such manner that the horn will he insulated and out of electrical contact with the rod, and in lamps in which the said holder has a tubular prolongation constituting the body or cylinder and a moving element of the dash-potI suspend the plunger member of the dash-pot from a plug of hard rubber or other non-conductor material fitted to the horn, so as to ei'ectually prevent electrical connection from that source, and I further insulate the said holder from the feed mechanism containing box or case through which it passes. In this Way I obtain a lamp which can be handled with entire safety, and which will endanger neither life nor property.

In the accompanying drawings, Figure l is a sectional elevation ofso much of an arc lamp t as needed for the purposes ot' explanation. Fig. 2 is a view 0n enlarged scale ofthe dashpot cylinder forming partot' the upper-carbon holder. Fig. 3 is a view on like scale of the plunger, with the plug from which it is suspended in section. Fig. 4I is a sectional elevation ofthe lower-carbon holder, with its insulating supporting bridge-tree and parts ofthe lamp-frame adjoining the Same. Fig. 5 is a plan of the bridge-tree.

The frame Aof the lamp is ofthe usual configuration. rIhe terminals are indicated at 7c kthe latterclectrically connected in the usual way with the upper-carbon holder E and the former in electrical connection with the lowercarbon holder H. The conducting-wire which leads from the terminal 7c to the holder II is shown at u, covered with rubber or other iusulating material, a', and extending through the limbs c c' of the frame, which are made hollow or tubular for this purpose. This is the preferred arrangement, inasmuch as the wire while insulated l'rom the frame is covered by the latter throughout its length. The lowercarbon holder H is alsoinsulatcd from the frame by a bridge-tree, G, of hard rubber or other suitable material, upon which the holder should he secured in a manner to permit ot' the usual adjustments. ln this wayI entirely insulate the frame, so that it may be handled with entire safety while the lamp is running. rIhe horn D is made fast to the usual wooden plate and spans the top ofthe frame. Within it is, as usual, the tubular carbon-holding rod E, which forms the cylinder and moving member ofthe dash-pot, and is designed to he filled with glycerine or other suitable liquid. Vithin it is the plunger, consisting in this instance of disks h, fast to the plunger-rod e', which is suspended from a plug, F, made ot' hard rubber or other non-conducting material, which is screwed into the top ot" the horn, as indicated in Fig. l. In this way--that is to say, by the employment of a non-conducting or insulating plug as the meansfor suspending theplungerthe carbon-holder is effectually insulated from the horn, which latter is thus free from any electrical change.

In order to more effectively insure the insulation of the horn, the enlarged overflow e on top ot' the cylinder E is made ot' hard rubber or some other suitable non-conducting material, so that in event of accidental contact between the two there can be no possible electrieal connection between the horn and the holder through that intermediary. The case which contains the usual carbon t'eed and regulating mechanism is indicated at B. l have not deemed it necessary to show said mechanism, inasmuch as the same is well known and forms no part ot' my invention. At the point Where the carbon-holder passes out from and below the ease l provide, instead of the usual bearing, an insulated bearing, consisting,` in this instance ofthe hardrubber washer b, provided with a .metallic lining', b. It' more than one bearing be provided for the carbon, each of them should be insulated from the case in this or some similar manner.

What I claim as my invention is- 1. In an are lamp, the combination, with the movable upper-carbon holder, of a horn insulated from electrical connection with said holder, and other parts which may be einbraeed in the lamp-circuit, substantially as hereinbefore set forth.

2. The non-conducting or insulated plug; F, in combination with the horn, the holder E, and the plunger, substantially as and for the purposes hereiubet'ore set forth.

3. The holder E, surmounted by a non-conducting` overiow, e, in combination with the plunger, the non-conducting or insulated plug F, and the horn, substantially as hereinbefore set 'orth.

4. The combination ot the movable upper carbon holder, the ease or box B, provided with insulated bearings at thepoint or points where the holder has contact with said case, and the lower-carbon holder, insulated also from said case, substantially as and t'or the purposes set forth.

5. In an arclamp, the combination, with the carbon-holders and other parts embraced in the lamp-circuit, ot'- the horn and the frame, insulated from said parts, substantially as and tor the purposes set forth.

MICHAEL J. OSULLIVAN.

Witnesses:

0. H. MILLER, E. RAINE.

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