US1537635A - Insulated suspension stem for electric-lighting fixtures - Google Patents

Description

May 12, 1925. 7 1,537,635

' A. W. WELLINGTON INSULATED SUSPENSION STEM FOR ELECTRIC LIGHTING FIXTURES Filed Sept. 5, 1923 Patented May 12, 1925.

UNITED STATES PATENT OFFICE.

ARTHUR IV. WELLINGTON, OF WATERBUBY, CONNECTICUT, ASSIGNOR TO CHASE COMPANIES, INCL, OF WATERBURY, CONNECTICUT, A CORPORATION.

INSULATED SUSPENSION STEM FOR ELECTRIC-LIGHTING FIXTURES.

Application filed September 5, 1923.

To all whom it may comer rt:

Be it known that I, ARTHUR WV. IVELL- INGTON, a citizen of the United States, residing at \Vaterbury, in the county of New Haven and State of Connecticut, have invented a new and useful Improvement in Insulated Suspension Stems for Electric- Lighting Fixtures; and I do hereby declare the following, when taken in connection with the accompanying drawings and the characters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this application, and represent in Fig. 1 a view in side elevation of an insulated suspension-stem for electric lighting fixtures, constructed in accordance wit-h my invention, and shown as installed upon a conduit-pipe of inclined presentation, with the ceiling, in which the said pipe is located, shown in section.

Fig. 2 a view of the fixture with its lower portion in elevation and its upper portion in central longitudinal section, taken at a right angle to the posit-ion in which the fixture is shown in Fig. 1.

F 3 a plan view thereof.

F at an underside perspective view of the internally-threaded cap, detached.

5 a detached perspective view of tie upper or spacingavasher.

6 a detached perspective broken view of the upper end of the tubular sheet-metal stein.

Fig. 7 a detached perspective view of the lower or suspension-washer.

Fig. 8 a detached perspective view of the coupling-stem.

Fig. 9 a detached perspective view of the guard-disk.

My invention relates to an improvement in insulated suspension-stems for electric lighting fixtures, the object being to pro vide, at a low cost for manufacture, a simple and GlIlCiBDt fixture adapted to compensate for any crookedness in the installation of the outlet, such as a crowfoot or conduitpipe, to which it is applied.

With these ends in view, my invention consists in an insulated suspensionsten1 for electric lighting fixtures, having certain details of construction and combinations of parts as will be hereinafter described and particularly pointed out in the claim.

Serial No. 661,030.

In carrying .out my invention, as herein shown, I employ a standardized, internallythreaded cap 10 adapted to be screwed over an outlet, such as a standard conduit-pipe 11, or over a standard crowfoot or other equivalent outlet. As shown, the conduit pipe 11 is crooked in its presentation, i. e., it does not stand at a right angle to the plane of the ceiling 12. The bottom of the said cap is formed with a centrally-located square hole 13, receiving the upper end of a square coupling-stud 14 permanently secured to it, and having its projecting upper end swaged down upon the bottom of the cap, as at 15. The said stud 1e serves as a means of coupling to and suspending from the cap a tubular suspension-stem 16 substantially corresponding thereto in diameter and permanently connected therewith by the said stud. At its upper end the stem 16 is formed with an inwardly-turned, an nular suspension-flange 17, which rests upon the edge of the upper face of a relatively thick lower or suspension-washer 18 of insulating material, in turn resting upon the head 19 of the stud. The said washer 18 is provided with a square hole 20, through which the stud passes and which is enough larger than the cross-sectional area of the stud to permit some play between them. The said washer is coupled to the stud let against rotation, by an indentation 21 formed in it, as shown in Figs. 1 and 2. Between the cap and the stem I locate an upper or spacing-washer 22 of insulating material, having a central perforation 23 through which the stud freely passes.

The parts above described are so proportioned that between the lower face of the cap 10 and the upper face of the suspension-washer 18 there is produced a clearance-space, the depth of which is greater than the combined thickness of the washer 22, and the flange 17, by the distance, represented at 24 in Fig. 2, between the lower face of the cap and the upper face of the washer 22, this space being suflicient to permit the tube 16 to be canted with reference to the cap 10, so as to compensate for any ordinary crookedness in the installation of the conduit-pipe 11 in the ceiling 12, as shown in Fig. 1.

The stem 16 is formed, near its upper end, with the usual wiring-opening 25, and has its lower end threaded for the application to it ofi a suspension-loop-fitting'26 of any approved construction.

Preferably and as shown, the head of the stud 14 is covered and guarded against possible short-circuits by an insulating disk 27 having, in its upper face, a concentric clearance-recess 28 for the head of the said stud, and held in place within the upper end of the stem 16 against the lower face of the suspension-washer 19, by indenting the surrounding portions of the stem as at 29. r

I claim:

In an insulated suspension-stem for elect-ric lighting fixtures, the combination with an internally-threaded cap formed in its lower end with a stud-receiving opening, of a tubular stem provided at its upper end with an inwardly turn'ed, annular flange, a non-rotatable, insulating suspension-washer located within the upper end of the stem in'position for the said flange to rest upon the edge of its upper face, an insulating spacing-washer located between theupper face of the said flange and the lower face of the said cap, and a non-rotatable stud made independent of the said cap, having its upper end inserted into the stud-receiving opening thereof, passing through the said washers, and formed at its lower end with a head for engagement with the lower face of the said suspension-washer, whereby the several parts mentioned are coupled together, and the said washers being propor tioned in thickness and the stud in length to create a space between the said flange and the lower face of the said cap in excess of the combined thickness of the spacing washer and flange, whereby the stem may be canted with respect to the cap.

In testimony whereof, Ihave signed this specification in the presence of two subscribing witnesses.

ARTHUR W. WELLINGTON.

Witnesses i H. C. BECKER, J. S. NEAGLE.

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