US637448A

US637448A - Electric-arc lamp.

Info

Publication number: US637448A
Application number: US65439397A
Authority: US
Inventors: William J Davy; George Thomas-Davies
Original assignee: Individual
Current assignee: Individual
Priority date: 1897-10-07
Filing date: 1897-10-07
Publication date: 1899-11-21
Anticipated expiration: 1916-11-21

Description

No. 637,448. I Patented Nov. 2|, 1899. W. J. DAVY &. G. THOMAS-DAVIES.

ELECTRIC ABC LAMP.

(Application fil d Oct 7, 189?.)

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ELECTRIC ARC LAMP.

(Application filed Oct. 7, 1897.)

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Patented Nov. 2|, I899. W. J. DAVY & G. THOMAS-DAVIES.

ELECTRIC ARC LAMP.

(Application filed Oct. 7, 1897.)

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UNITED STATES PATENT OFFICE.

\VILLIAM J. DAVY AND GEORGE THOMAS-DAVIES, OF LONDON, ENGLANlj.

ELECTRIC-ARC LAM F.

SPECIFICATION forming part of Letters Patent No. 637,448, dated November 21, 1899. Application filed OOtOl-Jel' '7, 1897. fierial No. 654,393. (No model.)

To ctZZ whom it may concern:

Be it known that we,WILLIAMJA1\iEs DAVY and GEORGE THOMAS-DAVIES, subjects of the Queen of Great Britain and Ireland, and residents of Ronalds road, Highbury, London, England, have invented certain new and usefulImprovementsin Electric-Arc Lamps; and we do hereby declare the following to be a full, clear, and exact description of the invention such as will enable others skilled in the art to which it appertains to make and use the same.

This invention forimprovements in electric arc lamps relates more especially to lampsin which the arc burns in an inclosed chamber to increase the length of life of the carbons; and one of the objects of this invention is to provide an efficient inclosed alternate or direct current arc-lamp. In this lamp a perfect inclosure is obtained without the aid of the outer globe, so that the capacity of the chamber is small and without the use of a sliding or similar joint through which air and gas can diffuse or pass.

In the accompanying sheets of illustrative drawings, Figure 1 is a sectional elevation of an inclosed arc-lamp constructed according to this invention. Fig. 2 is asection at right angles to Fig. 1. Fig. 3 is a cross-section of the controlling bobbin or solenoid. Figs. 4, 5, and 6 are detail views showing the arrangement for securing the inclosing globe to the lower-carbon holder, which is fixed. Fig. 7 shows the method of suspending the solenoidcore from the dash-pot. Figs. 8, 9, andlO are details of the brake or controlling gear, and Figs. 11 and 12 details of the dash-pot for steadying the mechanism.

The frame of the lamp consists of the central tube CL and of the upper disk Z), rigidly secured to the tube a. The top of the tube a is closed by a disk a, fitting tightly therein and secured to an ebonite plug a fixed in the upper end of the tube a. The ornamental casing c of the lamp and the suspending-piece c are secured to the tube a by the bolt 0 passing through c, c, and a Below the up per disk I) is a lower disk at, secured to the disk Z) by bolts 02. A casing cis clamped between the disks and d, and thus forms, with the disks 1) and d, an inclosed chamber of the regulating mechanism. The bottom yoke j is carried from the lower disk 61 by the yokerods f.

The regulatingbobbin 9 is wound on a former and between two flanges g, fixed on a tube 9 that is forced against the upper disk I) by the spring-cap g sliding on the frametube a. Thin longitudinal strips 9 of iron, are placed around this bobbin and forced into shape and secured in position by the bindingwires The regulatingcoil thus also forms an impedance-coil.

The tubular core it, made of iron strips for alternate-current lamps and iron tube for direct-currentlamps, slides free Within the tube g and is suspended from the dash-pot t' by the side links 72. and bolt 7L2, working in slots at in the frame-tube a. The core h is connected to the brake or regulating mechanisms by the flexible cords h 77/4.

The upper-carbon holder Z slides in the frame-tube a and is connected by the flexible conducting-wire Z to the binding-screw Z in one of the side links h. The upper carbon m passes between two jaws n n, fixed, respectively, between the pairs of links n n and 97, 91 connected together at their free ends. The links 71 are pivoted together at their meeting ends and at theirouter ends are connected together by the cords 71 passing through a loose sleeve 71. to one side of the end of the tubular core h, and the links a n by similar cords h passing through a similar sleeve 72, to the other side of the end of the core h. The cords 71 7t4 can be adjusted by sliding the sleeves h ll on the cords and fixing them by means of set-screws 7L7. The jaws normally rest on the stop-plate M. The sleeves can be dispensed with,the cords being simply sewed or otherwise secured. The pivots are extended outward and guided in slots in the fixed brackets M. The object of the slotted brackets is to prevent the brake from moving out of its position when inserting carbons.

The lowercarbon holder 0 screws or fits into the lower end of the inclosing transparent bell p, and the whole rests on a spring 0, fitting in a recess or hole in the stud o screwing into a cross-bar f fitting in notches or trunnions in the bottom yoke f. The crosspiece f can be lifted out of the yokef. The

stud 0 also carries the nut 0 for securing the usual globe q in position.

At the top of the lamp is the usual resistance-coil a", wound on a bobbin and connected in series with the series-controlling bobbin of the lamp.

The dash-pot t' is connected by the links h to the core h. The piston t" of the dash-pot is fixed to the frame-tube a by the pin 4?. The dash-pot t' can thus move between the piston t" and the closing disk to of the tube (6. This dash-pot acts as another piston or plunger in the dash-pot formed by the tube a and the disk at.

The action of the lamp is as follows: The current enters the lamp and passes through the resistance-coil r, thence to the framedisk b and frame-tube a, and partly through the tube a and partly through the flexible conductor Z to the uppercarbon holder, through the carbons to the lowercarbon holder, and by the conductor Z to the insulated binding-screw Z, thence through the regulatingsolenoid to the negative terminal. The carbons being in contact, the upper carbon resting on the lower by its own weight, on the passage of the current through the solenoid the core h and consequently the cords 71. h are drawn up and first raise the links a n n 72 off the stop-plate and then cause the jaws to grip the carbon and raise it and strike the arc. As the arc lengthens, due to the burning away gradually, the grip device is lowered onto the stop-plate and the jaws relax their hold on the carbon and a continuous and steady feed is obtained by the upper carbon slowly descending through the jaws. The spaces open to the are are thus the chamber inclosed by the bell p, the chamber inclosed by the casing e, the frame-tube a, and the solenoid-tube g Any excessive pressure of gases accumulating escapes through the spring-cap g or the mouth of the bell, the spring 0 acting as relief.

To renew the carbons, the screw 0 is slackened to remove the globe g. The stud o is then unscrewed out of the cross-piece f until the cross-piece can be raised out of its recesses or trunnion-bearin gs in the yoke f and then removed, with the bell and lower-carbon holder, through the yoke f, the top carbon and holder following by its weight. The top carbon is then removed and inserted in the lower-carbon holder and a fresh carbon placed in the upper holder, when the bell and lower carbon are placed in position, forcing upward the upper-carbon holder to its upper position. The upper edge of the bell rests against an asbestos washer s, and by gently screwing up the stud o the bell is forced against the asbestos, the spring 0 allowing for expansion and contraction and the like. The globe q is then replaced.

What we claim, and desire to secure by Letters Patent, is-

1. The construction and arrangement of the frame of the inclosed arc-lamp consisting of the central frame-tube, the solenoid-tube, the upper disk secured thereto, the lower disk bolted to the upper disk, the inclosing ring inclosing the space between the two disks and the lower yoke secured by yoke-rods to the lower disk and the glass bell the whole forming a perfectly-closed chamber, substantially as described.

2. The construction and arrangement of the regulating devices consisting of the grip device, the frame-tube, the uppercarbon holder sliding in the frame-tube, the solenoid core surrounding the frame-tube and connected to the grip device, the solenoid surrounding the solenoidcore, the dash-pot situated in the upper end of the frame-tube, and the cross-bar working in slots in the frame-tube and connected to the dash-pot and to the solenoid-core.

3. The means for securing the inclosing bell in position consisting of the bottom yoke supported from the frame of the lamp, the crossbar fitting in notches in the yoke, the stud screwing into the cross-bar, the lower-carbon holder secured to the transparent bell, and a spring Within the stud and on which the carbon-holder rests.

In testimony whereof we have affixed our signatures in presence of two witnesses.

WILLIAM J. DAVY. GEORGE THOMAS-DAVIES.

\Vitnesses:

ALBERT JONES, 1 CHRISTOPHER S. PARKER.