US783743A - Electric-lamp adjuster. - Google Patents

Description

No. 783,743. l PATENTED PBB. 28, 190m H. DoLxER, JR.

ELECTRIC LAMP ADJUSTER.

APPLIUATION HLED APB,.2.1904.

Wmeowo 7 wm/W06 Qwm, X Mu@ I @Hoff/nag A lto. 783,743.

Patented February 28, 1905.

HENRY DOLIER, JR., OF .PHiliiADlLP-ilA, .lillGNNSYi/'ANL/i.

SPECIFICATIONformng part of Letters Patent No. 783,'t3, dated February SBB, 1905.

Application filed April 2, 1904. Serial NoA 201,235.

Be it known that I, HENRY DOmnn, Jr., residing' at Philadelphia, in the county o'l'f Philadelphia and State ot' Pennsylvania, have invented a new and useful lGlect1'icLan1p Adjuster, ot' which' the 'following is a speciiication.

My invention relates to means for supporting' an incandescent lamp in a practically horizontal position by means oi the V[iexible conductor-cord and to means whereby the lamp may be rotated to any position with regard to the drop-cord.

My invention consists of means whereby an incandescent lamp may be adjusted as to height when suspended by a drop-cord and ot means i'or adjusting' the lamp to any desired position about its supperting'cord, such adjustment being' a rotation in a horizontal plane.

My invention consists oil a cord-adjuster, from which is supported in practically hori- Zontal position an incandescent lamp, there being' provided a swiveling' device applied either intermediate the parts oi the adjuster or intermediate the adjuster and lamp system, the lamp system comprising' the lamp proper, i'e'l'lector, and socket or other accessories.

The usual mode oi' supporting' an incandescent lamp is by a corddrop consisting' oi the conductors which convey the current to and from the lamp, the lamp-axis being' practically coincident with the vertically-hanging cord. lt is found that an incandescent lamp so suspended and as extensively used in 'tactories, machine-shops, and the like radiates the greater portion o1'I the lig'ht in horizontal directions rather than vertically di'iwnward, the latter direction ol radiation being' most desirable where workmen require the lamp to be placed immediately over their bench or machine in order to illuminate their work in the most thorough manner. l have 'found by photometer tests that the vertically-hanging incandescent lamp it the illumination in horizontal directions is` expressed by sixteen-candle power the illumination vertically downward, all conditions being' the same, is expressed by 7.9 candle power. In other words, the ordinary incandescent lamp in order to cause the greatest illumination vertically downward must be turned through a rig'ht angie, so that its axis becomes practically horizontal. lriforkmeu do so turn the lamp by tying' it up tosome fixed object and then they immediately find that due tothe twisting' tendencies ol the drop-cord the lamp will assume undesired positions. i

lt is to gain the advantages of maximum downward illumination and to prevent the lamp from assuming' undesired positions about the cord that my invention is adaptable.

Reference is to be had to the accompanying' lrawing's, in which@ Figure i is a sectional view oi the swiveling' device. l*1 ig'. 2 is a general view, in side elevation, o'lI the cord-drop. adjuster, swiveling' device, and lamp system. Fig'. 3 is a view in elevation olAl combined adjuster and swiveling' device.

Referring' tothe drawings, ll represents the usual cord-drop comprising' the twisted or braided conductors suspended vertieall y 'trom the ceiling' cut-out, rosette, or other device.

2 is an adjuster ot dumb-bell torni having' the spherieally-shaped end portions 3 and 3', through which extend the channels a; and 5, respectively. 'lln'oug'hthese channels is strung' the lanipcord 1. fi'y pulling' either the up per or lower portion ol'l the lamp-cord through the channels Llor 5 to greater or less extent the height ol the lamp system may be ad justed.

6 is a chain or other flexible supporting' means sefnired at its upper end to the spherical member 3 and at its lower end to the hemispherieal shell member 7, made, preterably, oi' spun metal. The lower edg'e ol" the member 7 is i'lared outwardly, as shown at 7 in `Fig'. l. 8 is a similar hemispherieal shell member having' the iang'e in" spun over and embracing' the iiang'e 7 The engagement between 7 and 8 is, however, a loose one, thereby j iiermitting' relative rotation between the members 7 and 8. i

At 9 is shown a chain or other member similar toe, secured at its upper end to the swiveling' member 8 and at its lower end engaged by the hook l0, secured to the neck ii ol a shade and reflector i2. Un the neck 1i are provided resilient clasps or lingers 18, which embrace and engage the bead 14, spun in the lampsocket 15. By this engagement the member 12 may be rotated to any position about the longitudinal axis of the lamp 16, whose filament is shown at 17 extending' horizontally.` rIhe lamp 16 may have the screwthreaded Edison base or any other type of base to engage and be secured in the usual socket 1,.having the usual switch-key 18. The hook 1() is applied at such point of the lamp system that such system will practically balance about the hook 10, and thus assume a practically horizontal position, as shown. If no swiveling' means were provided, the lamp 16 would take up a position correspond'- ing to the position of equilibrium of the corddrop, which has decided twisting' tendencies, as well understood in the art. Cords ot structure other than that illustrated also have twisting tendencies and cause the lamp suspended by them to take up a certain definite position, and when the lamp is rotated from such position the tendency of the cord to untwist will again return the lamp to its initial position. In the ordinary lamp suspension with the lamp-axis vertical and coincident with the cord-axis such behavior is generally oi' no inconvenience. However, when the lamp is suspended practically horizontally for the purposes hereinbefore set forth such action is decidedly undesirable. This disadvantage is overcome, however, by the swi veling' action of the member 8 with regard to the member 7. In other words, the lamp and lamp system havea swiveling action with regard to the cord or the cord-adjuster. From this it follows that the lamp may be rotated to any position and will there remain and be independent of the twisting action-otl its cord support.

Instead of the flexible connections 6 and 9 rigid connections, such as rods, may bc cmployed.

In Fig. 3 is shown a modilied arrangement for securing the swiveling action. In this case the spherical members 3 and 3 are separate and distinct from each other. The hemispherical member 7 is directly connected to the spherical member 3 and the hemispherical member 8 is directly connected to the hemispherical member 3. The channels L1 and 5 are arranged and serve as previously described.

From this it is apparent that the member 3IY has a swiveling action with respect to the member 8 and with a simple chain or ro'd connection between the spherical member 8 and the member 11 of the lamp system permits such lamp system to have a swiveling action with regard to the upper portion of the corddrop.

The members 7 and `8 are secured to the members 3 and 3, respectively, in anydesired manners-as, for example, fastening the hemispherical members to the spherical members 3 and 3' by means of ordinary screws, the screw-heads being on the inside of the hemispherical lnembers. Furthermore, in place of the direct connection between the members 7 and 8 and the members 8 and 3 the connection may be indirect as by means of lexible or rigid members intermediate 3 and7 andintermediate members 8 and 3.

W'hat I claim is 1. In combination, a drop-cord, an adjuster comprising a plurality of parts each engaging said drop-cord, a swivel connection between said cord-engaging parts, a lamp and its attachments,and a member depending from said adjuster and secured approximate the middle of said lamp and its attachments, whereby said lamp is supported in approximately horizontal position.

2. In combination, a drop-cord, an adjuster comprising a plurality of parts each engaging said drop-cord, a memberdepending' from said adjuster, lamp supported by said member, and a swivel connected between said adjuster parts, whereby said lamp is independent of the twisting tendencies of said drop-cord.

3. A cord-adjuster comprising independent parts each adapted to frictionally engage a drop-cord to secure the same, and a swivel connected between said independent parts.

el. Acord-adjuster comprising independent parts each adapted to engagea drop-cord, and a swivel connecting' said parts, said swivel comprising' shell members secured to each other by flange engagement, whereby said adjuster parts may rotate with respect to each other.

HENRY DOLIER, JP.. fitnessesz JOHN CoNNELL, LILIAN M. (Jemima.

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