US1735068A - Electric-lighting fixture - Google Patents

Description

Nov. 12, 1929. E. c. WHITE ELECTRIC LIGHTING FIXTURE Filed April 27, 1925 2 Sheets-Sheet 2 FSGLH INVENTOR.

w Man/ A i. .2 n N Patented Nov. 12, 1929 UNITED STATES ERNEST CANTELO WHITE; 01 NEW YORK, N. AssI'eNoR or ONE-HALF T0 R.

FISHER, 0E PHILADELPHIA, PENNSYLVANIA PATENT oEncE I FENTON ELECTRIC-LIGHTING FIXTURE Application filed April 27, 1925. Serial No. 25,987.

My invention relates to the construction of all types of electric light fixtures including wall brackets, ceiling fixtures, chandeliers, table lamps, fioor lamps, adjustable fixtures and all appliances or parts thereof which contain or include a lamp socket.

In my copending application, Ser. No. 10,182, filed February, 19th, 1925, I describe the method of producing a lighting fixture from insulating material so as to house and support the lamp socket or sockets in a simphfied manner and for other purposes therein de scribed. The objects of my present invention are to furnish a simplified construct-ion of lighting fixtures by constructing the lamp socket as part of the fixture. A further purpose is to provide novel means for the easy adaptation of a manufactured lighting fixture to different uses with only such alterations as may be readily performed by any electrical wireman at the time the fixture is installed.

In the accompanying drawings, Fig. 1 13 the top view of an electric ceiling fixture; Fig. 2 is a cross section thereof on the line A-A; Fig. 3 is a bottom View thereof; Fig. i a perspective view of an ordinary brass screw-shell such as commonly used in lamp sockets; Fig. 5 is a cross section of the said screw-shell with a threaded insert riveted to same; Fig. 6 is a cross section of the center portion of a mould for supporting the said screw-shell; Fig. 7 is a cross section of the said center portion of a mould and the said screw-shell and insert and an additional insert placed thereon for the purpose hereinafter described; Fig. 8 is a plan view of a plate used for installing the fixture on an outlet box; Fig. 9 is a cross section of the fixture as installed; Fig. 10 is a cross section of the fixture illustrating how it may be utilized for the neat addition of a pendant switch; Fig. 11 is a perspective sketch illustrating this use; Fig. 12 is a cross section of the fixture illustrating how it may be utilized as the support for a pendant bowl; Fig. 13 is a perspective sketch illustrating this use. i

In carrying out my invention according to the illustrated embodiment thereof I provide a body 1 of moulded insulating material having a brass screw shell 2 and brass inserts 3 and 4t moulded into said body.

One method of accomplishing this is to mould the said fixture body lamp-socket-endupward, with pins provided in the bottom of the mould for entering and positioning the inserts 3 and 4: according to the common practics in moulding insulating material. The upper part of the mould or plunger is then provided with a center portion, which is both slideable and rotatable with respect to the rest of the plunger. This center portion 5 is provided with a thread 6 on which the brass screw-shell may be threaded, a rabbet 7 to provide room for the riveted end of the insert 3 and the central recess 8 of the proper size to receive one end of the in iert 4. In prac tice the insert 3 is preferably first riveted into the opening 9 of the screw-shell 2. The screw-shell is then screwed onto the center portion of the mould 5 and the insert 4: is fitted into the recess 8 as illustrated in Fig. 7 in reverse position. The center portion 5 is then lowered into the mould until the inserts 3 and 4 set over the pins provided in the lower part of the mould as above described. The mould is then filled and the rest of the moulding operation carried on as usual. It will be noticed that in this case the fixture body is provided with a groove 10 which of courserequires a separate collar in the main plunger which may be opened before opening the mould. It will also be understood that the central portion 5 will be unscrewed from the screw-shell 2 and withdrawn before opening the mould.

The fixture body as moulded is provided with three holes 11 and three recesses 12 which are formed so thatthey do not quite pentrate the fixture body but leave a thin surface web of material 12 which though practically invisible from the side opposite to the recess may yet be easily knocked out by any convenient tool without the necessity for drilling in order to provide an opening instead of a recess when desired.

The back or top of the fixture body is provided with a vertical edge 13 to provide a space 14 for the use of a mounting plate 15 screw-shell moulded into or to accommodate the projecting edges of an outlet box. The fixture body also has two recesses 16 and 17 adjacent to the open ends of the threaded inserts 3 and l respectively, which recesses are of suflicient depth to permit the use of binding screws 18 and 19 tor attaching wires to the inserts so that the heads of the said binding screws will be within the said recesses respectively and be thereby prevented from electrical Contact with the mounting plate or other metallic parts.

It will be observed in Fig. 9 that when the lighting fixture is connected to supply wires 20 and 21 as described, the end 4 of the insert l provides the center contact of the lamp socket and that the screw-shell 2 provides the usual screw-shell contact.

The mounting plate 15 is provided with e which are spaced to accommodate holes 22 the tapped lugs of outlet boxes so that the plate may be fastened to an outlet box with the screws 28. The said mounting plate also has tapped holes 24 spaced that the ti: ure body may be fastened to the mounting plate by means of the screws 25 which pass througn the openings 11. The large ope; provided in the mountir." plate will be opposite the recesses 12 in the l Xtm body the central opening 2? is provide in the mounting plate for e passage of wires. The mounting plate is first fastened to the outlet box, the supp y wires then connected to the inserts by means of the binding screws and the fixture body then fastened to the mounting plate. lhe groove 10 is provided for the attachment or a shade holder in the usual manner.

in Figs. 10 and 11 the use of one of t pendant switch is illustratec and will be understood by any electrician. l 13 illustrates the use of the fixture for suspending a bowl by means of eye-bolts 28 fastened in the knock-out recesses 12 by means of nuts 29 as detailed in Fig. 12. in this case the light in the bowl'is provided screwing an ordinary attachment plug into the ceiling fixture dropping a cord n soclret and lamp into the bowl as illustrated.

It will be understood that the methods of construction herein described are a aplicable to all forms of lighting fixtures and to lamp sockets used as parts ther of, as will be readily understood by anyone versed in the art, and that my invention, iciore, includes all devices in which the construction and assembly of parts includes what I claim as new, which is:

1. An electric lighting a body of insulating mater fixture including al, lamp socket he said body, a threaded insert electrically connected to the said screw-shell, a second threaded insert insulated from the said screw-shell and forming a center lamp socket contact, both of said inserts being mouded into said body and binding screws for connecting supply wires to the said inserts.

2. An electric lighting fixture, comprising an integral body of moulded insulation material providing a lampsocket recess, a metallic center contact moulded into said body of insulation material to expose one end of the same within the bottom of said socket recess, said center contact having an internally threaded socket in its opposite end exosed at rearward side of said body to receive a service wire binding screw, and a metallic screw-shell contact also moulded into said land of insulation material to dispose said so the l. sal 'l i'lll fi ice wire binding screw.

Signed at New '1 orlr, N. Y., on this 23rd dav of April, Ell ST CANTEL'O lVHITE.

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