US1762511A - Electric lamp socket - Google Patents

Description

June 10, 1930.

G. H. ELWELL ELECTRIC LAMP SOCKET Filed Aug. 1'7, 1927 5 M a I Patented June 10, 1930 TED STTES GEORGE HENRY ELWELL, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO THE GREIST MANUFACTURING COMPANY, A CORPORATION OF CONNECTICUT ELECTRIC LAMP SOCKET Application filed August 17, 1927. Serial No. 213,670.

The invention relates to improvements in electric lamp sockets and especially to the means for permanently uniting the capped end of the socket with the nipple which connects the lamp socket to a fixture. The internally screw-threaded nippleis ordinarily cut from solid metal and machined to shape, being provided with a flange and reduced end for projection into an aperture ofthe cap to be therein upset or headed up. The lamp socket is usually constructed from sheet metal of thin gauge and therefore considerable strain is ordinarily suffered by the capped end of the socket in applying the nipple thereto and in screwing the socket to a fixture.

In the development of the art there has been provided certain reinforcing means, such washers encircling both the inturncd flange, integral with the socket cap, and the inserted reduced end of the nipple, the latter being laterally upset on the inturned flange and the washer. Further development has provided the washer with spaced notches into which portions of the reduced end of the nipple are upset to provide a union proof against swiveling. Such a provision is most important, but in applying the staking tool thereto the relative positions of washer and tool must be considered and, therefore, the object of the present invention is to provide such a union that permits the application of the staking tool thereto Without regard to any relative rotary position. A further object of the invention is to provide a washer of such shape as shall provide a reinforcing engaging support adapted to snugly conform to the interior formation of the dome of the socket adjacent the nipple aperture where the metal is often very thin.

The following is the description of an embodiment of the invention, reference being had to the accompanying drawing (one sheet) in which Figure 1 is a side elevation of the capped end of the socket, the nipple, and the washer, before assembly; Figure 2 is a side elevation of assembled parts before the upsetting operation, the wall of the dome being broken to permit a partial interior view of certain parts in cross-section; and Figure 3 is a detail view in cross-section of upset parts.

Referring more particularly to the drawing, in which similar parts are similarly num bered, the cap or shell 1 may be of any separable two-part form or one-piece construction with an aperture in the capped end thereof and an integral inturned flange 2 surrounding the aperture within the cap, as illustrated by dotted line in Figure 1. The Washer 3 is formed to adapt its surface on one side to snugly engage and conform to the interior formation of the capped end of the socket adjacent the aperture while its reverse side is provided with an internally formed bur or flange 4 extending at substantially right angles thereto and adapted to closely encircle the aperture flange. The nipple 5 may be of any form or construction providing a shoulder 6 facing the extension or reduced end which presents a cylindrical wall having an interiorly beveled end 7 adapted to extend into the socket aperture and beyond the flange l, as illustrated by the Figure 2. WVith the parts virtually in the relative order illustrated by Figure 1, they are assembled to the positions illustrated by Figure 2 in readiness for the proper staking tool to upset laterally at certain points, as at 8, the beveled end 7 as illustrated by Figure 3, the flanges 2 and 4 being substantially upset therewith and indented at the radial points 8, thereby providing a permanent strain-resisting union of the parts thus rigidly held against relative rotation. While the body of the washer 3 is illustrated as flat to fit the flat portion of the cap surrounding the aperture, yet should the socket adjacent the aperture be of any other form the body of the washer 3 would assume that particular formation.

hat I claim is 1. A cap having an aperture and an inte gral flange surrounding the aperture and projecting within the cap a circular washer having a bur encircling the flange, the bur projecting in the same direction as the flange: and a flanged nipple inserted into the aperture, the three being united by laterally disposed displacements of their annular walls within the cap.

2. A cap having an aperture and an inte-.. gral flange surrounding the aperture and proj ecting Within the cap; a circular WdSl16ll12LV- ing a flange encircling the aperture flange, both flanges projecting in the same direction; and a flanged nipple eXteriorly inserted Within the aperture and presenting to the interior of the cap an annular Wall having an internal beveled edge, the three being united by laterally disposed displacements of the beveled Wall and the flanges Within the cap.

3. An assembling means comprising a shouldered nipple and a socket shell, an aperture in the shell and an integral circular flange surrounding the aperture and projecting into the shell, and a Washer conforming to the form of the shell interior adjacent the aperture and having a flange encircling the aperture flange and projecting in the same direction, a reduced portion of the shouldered nipple being inserted Within the aperture and projecting Within the shell, said reduced portion consisting of a cylindrical body the annular end of Which is internally beveled, the nipple, the shell, and the Washer being united by the exterior support provided by the shoulder and by the laterally outward disposed displacements of the beveled nipple end and the flanges of the aperture and the Washer at radial points Within the shell.

' GEORGE HENRY ELWELL.

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