US1487181A - Lighting fixture - Google Patents

Description

March 18 1924 1,487,182

F. H ROBINSON LIGHTING FIXTURE Filed 001:. -31 1922 flank H. fmms vwamfoz Patented Mar. 18 A.

UNITED STATES PATENT orrica.

FRANK n. ROBINSON, or BAYONNE, NEW JERSEY, ASSIGNOR TO narrower. .irniz'rln. SPINNING & STAMPING co, or NEW YORK, N. Y., A CORPORATION on NEW YORK.

LIGHTING FIXTURE Application filed October 31, 1922. Serial No. 598,075.

To all whom it may concern:

Y Be it known that I, FRANK H. ROBINSON, a citizen of the United StatesQresiding at Bayonne, in the county of Hudson and the State of New Jersey, have invented eel-rain new and useful Improvements in Lighting Fixtures, of which the following is a specification.

My invention relates generally to improvements in electric lighting fixtures and has specific reference to the construction of the supporting loopand the particular arrangement of the circuit wires leading through the same to the interior of the lighting fixture. Electric lighting fixtures of the type I which usea supporting loop of the character hereinafter described, are referred to generally as'hanging fixtures and consist of a ceilingplate or canopy and stem from which is suspended one end of a section of chain links attached at its opposite end to a supv V 7 provide thebase of the loo inember with? porting loop The loop as a rule is a memher having an eye to receive the and link of thesupporting'chain and an annular base at'its opposite end from which the main light supporting. fixture or body is sup ported. The base is provided with a central bore which leads to a threaded opening,' the latter being adapted to receive one end of a pipe having a hieky secured to its lower end. The hicky in such a fixture supports the spindle which extends axially through the lower interior of the lighting fixture and which receives a nut at this lower end adjustable against the under surface of a portion of the fixture to hold the latter in position. In order to wiresucli an arrangement it is necessary to thread the wire through the central bore and into the end of the pipe, and thereai ter through the pipe and out through the openings in the hicky.

' But one of the main difficulties encountered has resulted from these threading steps which have a, tendency to strip the insulation from the wire in at least four places during' the operation, first where the wire enters the opening in the base of the loop and then again at the entrance to the pipe; third, at the opposite end ofthe pi e and finally as the wire is drawn 'throug the hicky. It has been found that a large percentage of the fires started through faulty wires come set forth.

canopy 10, in the present from a. short circuit caused in the section of a wire which has been drawn through just such an arrangement of sharp edges as described above. One of the principal objects of the present invention is to eliminate the central openingjn the loop and do away,

with both the pipe and hicky and in lieu to thereof to provide the base with separate i or spaced slots or channels in its surface, the passages thus made communicating with the interior of themain light supporting" fixture throu h an opening in the latter,

eing formed by rollin the the opening edges of the material back upon itse f to". provide a smooth edge; whereby the single strands of insulated wire leadin frointhef canopy may be threaded throng =tlie sop-117$ 1 Penings P c 'wainst; the: edge the Opening to fear in y m m a -the insulation about the wires. 1 A further object of the invention isto'jl a depending threaded stem'w ch is adapted ;l to pro ect through the main fixture to support'the latter in the manner hereinafter" The invention is illustrated in the 'ac'-'' company drawing, in which, Figureil is'a'n elevational view of'ahang'ing type ofli htingfixture equipped with my improve sup-" porting loop; Figure 2 is a perspective view {3? of the supporting loop; and Figure 3. is a bottom plan view of the loop; In the drawing, reference being had articularly to Figure 1, 10 designates a cei ing plate or canopy and 11 a depending section 9 of chain engaged at itsrlower end in a supporting loop 12. The loop 12 connects with the upper portion of the main li ht supporting fixture l3 and is provided wit a threaded stem 14 projecting axially thereof and through the fixture to receive a nut 15 at the outside of the lower' end of the'fixture 13. The latter is further provided with side. arms 16 from which the usual light shades 17 are suspended. .The lower endl of the fixture, is provide with a hollow stem 18 and drilled cap' 19 through which circuit wires or ends 20 lead from the ordinary outlet box, not shown,to the lower portion of the fixture. It 0 iscustomary to use a covering for such wires as will match ineolor the metallic finish of the links in the chain 11, and with the wires so colored they are practically invisible and may be interwoven with the links of the chain without materially changing the appearance of the chain itself.

Referring 'now to the supporting loop 12, and especially to Figures 2 and 3, the loop proper comprises a metal member having a 'lon itudinally disposed loop portion 21 provi ed at its lower end with an integral annular flange 22, the latter being formed with a projecting under ring or step 23,

which is of a smaller diameter thanthe flange 22. The rim or step 23 together with flange 22 may be rilled and tapped to receive one end of the threaded stem 14, but the 0 ening for the stem will not project entire y through this portion of the loop. In order that the loop 12'1may be firmly attached to the main su porting fixture 13 the wall of the centre axial opening 24 therein is of a size to embrace the ring portion 23 of the flange 22, as clearly shown I in Figure 2. In order to insure against possible injury of the wire when brought .into contact with the adjacent edge of the opening 24, the edges of the latter are formed by bending or rolling the material back upon itself to provide a smooth wall, as shown in 'Figure 2. The wires 20, as previously stated, follow the links 11 and then drop over the loop portion 21 and enter the fixture 13 through a pair of oppositely disposed slots or channels 25 which are cut or cast into the surface of the flange 22 and ring '23. Both channels 25, when the loop is assembled with the fixture 13, form one wall of the inlet openings into the interior of the fixture, while the smooth adjacent periphery of the opening 24 provides the opposite walls. In this manner two distinct openings are provided, one for each cord or wire 20, which ma be readily and safely inserted through 15 ie openings thus made without fearof injury to the insulation on the wire.

What I claim is:-

1. A supporting loop for lighting fixtures, comprising a loop portion and an integral annular end member, said end member being provided with a stepped bottom surface to project into said li htmg fixtures and longitudinally dispose open channels on op posite'- sides tl1ereof, said channels being of a depth: rojecting beyond the stepped sin face, wh reby direct communication is established between the outside of the annular member and the interior of the fixture,

2. In a lighting 'fixture, the combination with a light supporting body'provided with central openings at opposite ends, of a supporting loop therefor, com rising a loop portion and an integral annu ar end portion provided with a' stepped under surface adapted to project into the opening in one end of the body, the annular end po'rtion being provided withopen lofigitudinal channels at o posite sidescommunicating with the 'inter or-zef the body through the said opgniifisf a threaded stem screwed in a threaded bore extendin to a oint short of the opening forming t e sai loop, said stem projecting axially'of the said supporting loop andthrough the opening at the opposite end of the body, and a nut for said 'stem adjustable against the said body.

3. In a fixture of the character described FRANK H. ROBINSON.

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