US1405287A

US1405287A - Electrical lamp

Info

Publication number: US1405287A
Application number: US438908A
Authority: US
Inventors: Joseph A Clifford
Original assignee: Individual
Current assignee: Individual
Priority date: 1921-01-21
Filing date: 1921-01-21
Publication date: 1922-01-31
Anticipated expiration: 1939-01-31

Description

J. A. cuFFuRD.l

ELECTRICAL LAMP. APPLICATION FILED IAN. 21, |921.

Patented Jan. 31,1922

AHORA/Eni UNITD STATES vPATENT OFFICIELy JOSEPH A. CLIFFORD, 0F WASHINGTON, DISTRICT OF COLUMBIA.

ELECTRICAL LAMP.

Specification of Letters Patent.

Application filed January 21, 1921. Serial No. 438,808.

' To all v'whom t may concern.'

Be it known that I, JOSEPH A. CnIFFoRD, a resident of Washington, in the D1str1ct of Columbia, and a citizen of the United States,

have invented certain new and useful I mprovements in Electrical L amps, of whlch the following is a specificatlon.

.'This invention relates, generally, to theatrical appliances and, particularly, to de" vices for illuminating theatre-stages; and

has for its object to, provide a novel construction of portable, floor-supported electric lamp having a resiliently-supported, lamp-bulb'casing, whereby the tendency to break of the tungsten filaments of the lamp is obviated.

It will be understood that portable stagelamps are heavy and argJ subjected to Somoa 1 what rough handling by theatre-employes,

in being dragged from place to place on the stage, the ensuing jars and vibrations tending to break the tungsten filaments ofthe lamp, if the lamp-supporting pedestal 1s a rigid structure.

Other objects, going to make up the ultimate perfection of the lamp as an entirety, will appear as the specification proceeds and the nature of the invention is more fullyunderstood.

The invention is clearly illustrated in the accompanying drawing, forming part of my specification, and in which likereference characters indicate corresponding parts in the two views. Briefly described: j

Figure 1 is a view in perspective of a stagelamp constructed in accordance with my 1nvention, and v A Figure 2 is a fragmentary view in side elevation, partly in section, of the lamp.

In the illustrated embodiment, 1 is a suitable base, which, ,as shown, is preferably a disk-shaped member, having a" central upstanding boss 2, in which is screwed or otherwise suitably secured a pedestal 3, which may, as shown in Fig. 2, be a tubular'member and may be exteriorly threaded, toward its upper end, for engagement with the inbar 9 holds', the latter against movement,

when the lamp-casing 10 has been tiltably adjusted to the desired position. j

Thelamp-casing 10 is tiltably supported upon the. bracket, by being pivoted thereto, as shown at 13.

The lamp-casing 10 carries therein the lamp bulb 14, to which is connected the electric circuit wiring in the cable 15. j

To cushion the lamp-casingy 10 and thus the tungsten filaments in the lamp-bulb-14 against shocks and jars, incident to pulling the portable lamp about the stage, I provide the means about to be described. A coiled spring 16 encircles the stem 5 and bears, at its upper end, against a collar 17 adjustably secured to the stem 5 by means of aset` screw 18, and, at its lower endagainst the looped terminal 19 of a wire hook 20 supporting the cable 15, which passes through an eye 21 carried by the pedestal 3, toward` theylower end thereof. The looped terminal 19 of the hook 20 encircles, as shown, the stem 5, and bears upon the upper end of the nipple-4, and is yieldingly` held against upward displacement, or swinging movement on the rod 5 as a pivot, by the spring 16. The spring, therefore, in the peculiar combination of parts described, serves two functions,-namely, constitutes a common means for resiliently supporting the rod or stem '5 and thus cushioning the lamp-filaments against shock, and for frictionally holding the hook 20 in any position of rotative adjustment yand also yieldingly holding the hook against upward displacement. By raising or lowering the collar 17 on the stem 5, the, degree of projection of the latter within the pedestal 3 may bevaried, as desired.

It will be seen that, by the peculiar construction provided, all jars and shocks, incident to moving the lamp about the stage, will be taken up, and the lamp-casing 10 cushionedagainst shocks and jarsand the tungsten filaments of the electric-light bulb 14 will not be broken by such shocks and jars.

It will be seen also, that the means forf cushioning the lamp-casing 10 necessarily, in my construction, comprehends three elements, namely, the slidable stem 5, the fcollar 17, and the spring 16, since thesethree elements are indispensable and enter into combination in cushioning the lamp-casing 10. It will also be seen that -by adjusting the collar 17 lengthwise on the stem"5, the projection of the latter within the pedestal 3 may be varied, whereby the lamp-casing 10l may be disposed nearer to or farther from the stage or floor.

Having thus fully'described my invention, what l claim as new and desire to secure by Letters Patent of the United Statesis:

A portable electric lamp, comprising a hollow pedestal, a lamp-casing for the electric-light bulb, a stem telescoping in said pedestal and supporting said lamp-casing, a cable enclosing the electric wire-conductors,

a wire cable-supporting hook having av looped terminal encircling said stem and resting upon the top of said pedestal, and common means for resiliently supporting said stem in said pedestal, and for holding said hook in any position of rotative adjustment and also yieldingly holding said hook against upward displacement, said means comprising a coiled spring encircling said stem and bearing, at one end thereof, against said looped terminal oit said hook, and a collar carried by and adjustable longitudinally of said stem and bearing against said coiled spring at the other" end thereof.

in testimony whereof, ll hereunto aiiix my signature.,

Josnrn A.. cnrrronn.