US1990729A - Electric lamp socket shell - Google Patents

Description

Feb; 12, 1935; G. H. ELWELL 1,990,729

ELECTRIC LAMP SOCKET SHELL Filed Aug. 17, 1927 Patented Feb. 1 2, 19 35 I t r Q 'UNITEDQYSTATEVS PATENT OFFICE ELECTRIC LAIWP SOCKET SHELL George Henry Elwell, New Haven, Conn, assignor to The Greist Manufacturing Company, a corporation of Connecticut Application August 17, 1927, Serial No. 213,669

2 Claims. 01. 173-362 The invention relates to improvements in elecscrew-thread 3, beginning as at and continutric lamp socket shells and. especially to the maning (as illustrated in dotted line by the Figure 3) nor of impermanent assembly of a socket shell around the opposite side portion of the shell 1 and a shade holder, and the object of the invenand ending on the visible portion of the shell 5 tion is to provide the shell, of a lamp socket with 1, as at 6, its course in substantially encompassing 5 a screw-thread not only adapted to receive a the shell 1 lies throughout its length in one and corresponding thread of a part to be thereby asthe same radial pl Of the p Socketsembled to the shell, but to bindingly obstruct vioustothis impr v ment it w h u ht necesthatpart upon the completion of the assembly. to provide a a u a Shoulder, y means The following is the description of the invenof a special beading or other formation of the 10 tion, reference being had to the accompanying Shell, a st which the a r e of an drawing (one sheet) in whi h the Figure 1 i ternally threaded shade holder (not illustrated) a side elevation of a socket shell provided with m h n a in a p r l p ane here o limit the improvement; the Figure 2 is an opposite and bindingly lock'the holder in its threaded side elevation of the same shell; and the Figure assembly p an externally aded Shell. This 15 3 illustrates more clearly the course of the thread improvement, hOWeVer, Provides or the t eaded formed in the shell, While the im r nt i assembly of such a holder upon the screw-thread illustrated only in connection with an electric 3 n a n e thread e d 4 with a similar lamp socket shell it will be obvious that it may 'leslllt d therefore o y el mina es the I16- 20 be applied to the construction of any screweessity f pr v n a p i l i u pr '20 thread, and this wide application of the invenduees in a Single p at on of co struction a sinj ti is hereby antiqipated gle thread element capable of the dual accom Referring more particularly to the drawing, in plishment f p v in a thr d as m ly nd which similar parts are similarly numbered, the 3180 a binding limitation of that assembly dordinary type of l t i 1 k t m is ing to hold the assembled part rigidly in place. 25

illustrated as having the shell 1 and the cap 2 What I claim is:- separably assembled in any desired manner An electric a Socket Shell aV g 8- y ink o t th art, R ll d, or th i formed drical wall and-strands of a screw-thread formed in the metal of the 511611 1 adja t it lamp upon and encircling said wall, the top strand of receiving end, is the screw-thread3 encompassing Said ad being in a P e no mal to 30 the periphery of the shell 1, The course of thi the axis of the shell for the purpose herein set screw-thread 3, in a manner well known to the forth- 7 p art, continuously emerges from one to the next 2. A'n'electric lamp socket shell having a cylinof the several parallel radial planes of the lamp drical wall and projecting strands of a screw socket in which the thread lies. The formation thread formed in said wall, the top strand of said 35 and course of the thread end 4, however, con- Screw-thread being in a plane normal to the axis stitutes the improvement provided by this inof the shell for the purpose herein set forth. vention and, while the thread end 4 is an un- 7 broken and unobstructed continuance .of the GEORGE HENRY ELWELL.

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