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Publication numberUS955438 A
Publication typeGrant
Publication dateApr 19, 1910
Filing dateOct 25, 1909
Priority dateOct 25, 1909
Publication numberUS 955438 A, US 955438A, US-A-955438, US955438 A, US955438A
InventorsFrank J Russell
Original AssigneeFrank J Russell
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Screw-plug electrical receptacle.
US 955438 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)



Patented Apr. 39, 1919.




APPLICATION FILED 00T. 25, 1909. ggpga, Patented Aww, 1910.


@kW/wend F. J. RUSSELL,


APrLwATIoN :FILED com z5, 1909.




Specification of Letters Patent. 'Patented Apr. 19, 1910.

Application filed. October 25, i909. Serial No. 524,519. y

To un' trimm it may concern:

Bc it known that l. l"n.\. \'i J. RtjssnLL, a citizen of the United :itat-1s. residing at Brooklyn. in the county ot' Kings and State l of New York, have invented certain new and useful improvements in Screw-Plug lllectrical Receptacles, of which the :following is a lsi)ecii'ication.

This invention relates to the subject of electrical receptacles to eccive the plug of an incandescent lamp, or an extension circuit plug, and more particularly to the screwplug type ot receptacle wherein the lamp pl ng has a threaded supporting engagement within the plug-receiving socket of the recentacle body.

"fo this ond the invention has specially in view an improvement in the means which provide for the threaded support and electrical contact of the plug within the receptacle body, dispensing entirely with the use of the screw shell contact ordinarily used for that purpt'ise, and also obviatingthe necessity of providing a complete series of threads in the body oi' the receptacle itself,

or in any part arranged therein.

`With these general objects in view, the invention, 1n brief, contemplates a very simple and practical construction of side f' plug Contact for electrical receptacles which secures a wide separation of the opposite polarity contacts within the receptacle. At the same time the improved side plug contacts are ot such a nature and so arranged as to minimize the number ot' joints, screws, and moisture-pockets, while at the same time insuring the greatest possible simplicity ot' assembling and mamifacturing.` Furthermorc, the improvement admits of 'utilizing the strongest arrangement of a light body ot' porcelain.

T l e invention is necessarily susceptible to en'ibodiment in a variety of forms without departing from the spirit or scope. thereof, but. a few preferred embodiments are shown in the accompanying drawings, in which- Figure l is a sectional view of one form of electrical receptacle equipped with the im-\l provcment contemplated oy the present 'invention; Fig. 2 is a similar View on the line 2-2 ot' l; Fig. 3 is a bottom plan view' ol" the form of the receptacle shown in F ig. l; Fig. is a sectional view of an electrical sign receptacle equipped with the present invention; Fig. 5 is a similar View on the line 5&5 of Fig. 1; Fig. (3 is a bottom plan view of the receptacle construction shown in Figs. 4, 5 and (3; Fig. 7 is a sectional view oi an electrical molding` receptacle embodying the present invention; Fig. S is a similar view on the line 8-8 of Fig. Y; Fig. 9 is a view showing the wire terminal connection for the side plug Contact stripsemployed in the form of the receptacle shown in Figs. 7 and S; Fig. l0 is a planvicw of an illustrated modification of the invention7 wherein more than two of the side contact strips are employed.

Like references designate corresponding parts in the several figures of the drawing.

Referring to the application of the inven- .tion shown in Figs. l, 2 and 3 of thedrawing, the receptacle body designated in its'entirety by the numeral l is illustrated as be-` ing .of the one-piece porcelain type and embodying in its construction the usual cup y0r socket party 2, and an integral base 3 having a ividened annular lsupporting flange 4 pierced by screw-holes to receive the screw or equivalent fasteners for holding the same in position, said supporting tiange also being designed to support and expose. on the front side thereof the opposite polarity Wire terminals. The cup or socket part lo" rthe receptacle body includes the usual plug-receiving socket and exposed within this socket is theccn-ter plug contact? and the side plug contact 8- rlhe center plug contactis shown as simply consisting of a spring arm or plate extended laterally through a side opening 9 in the receptacle and having its free inner end portion lying centrally within the bottom portion of the plug-receiving socket, While the outer or external end portion of the center plug contact 7 is held by means of a fastening screw l0 to vone of the external wire term'inal plates ll, exposed on the front side ot the l'langc 4 and equipped lWith the usual binding screw l2.

According to the present invention the side plug contactr 8-8 consists of relatively' narrow and oppositely arranged crimped metal strips arranged parallel tothe axis of the socket and of the plug. In the'constructionl shown in Figs. l, 2 and 3, a pair of these strips 8 is employed, with the separate strips in diametrically opposite arrangement. A

.distinguishing feature of the invention. re-

sides in having the crimps of one stripy in complemental spiral or screw-thread rela- A26 within the inner cup depths in the bottom part tion to the crimps of the other strip or i strips, in other words, said contact strips bel ing in such relation to each other as to form a receiving thread for the electrical plug.

On account of the complemental screwthread relation between the separated strips it will be observed that the outer extremities of these strips are out of transverse alinement, but it is preferable, for manufacturing purposes, to have these strips duplicates and of the same length. Hence, with strips 8 of the same length, the relation referred to may i be preserved by providing a deeper seat for the fast end of one strip than for the fast end of the other strip. This is shown in Fig. 2 of the drawing, wherein the opposite strips 8 are shown as provided with or formed at their inner ends with supporting flanges 13 lying within a seating recessi14 in the outer side of the bottom or base 3 and arranged in overlapping contacting relation, with one of the flanges or ends 13 seated in a channel or rabbet 15. In the construct-ion referred to, the inner end portions of the opposite strips 8 pass entirely through bottom openings lpiercing the base at the bottom of the socket. The overlapping contacting ends of the strips 8 are metalically engaged by the inner end portion of the other Wire terminal plate 17 held in place by a fastening screw 18 and having its outer eX- osed end portion equipped with the usual inding screw 19.

In Figs. 4, 5 and 6 of the drawings the invention is shown applied to an electrical sign receptacle having a two-part body consisting of the inner and outer telescoping cup members 2O and 21 clamping, respectively, upon opposite sides of an interposed sign sheet or other supporting element 22. The two cup members 2Ov and 21 are detachably and adjustably held together by means of a center combined assembling and conducting screw 23 engaging a threaded nut 24 seated in the bottom part of the outer cup member 21, the head of said screw engaging and holding in lace a center plug contact plate 25 seated on the bottom of the plug-receiving socket member 2G. The side plug contacts 8 in the sign receptacle embodiment of the invention are of the same kind and bear the same relation as the strips 8 previously referred to, but are provided at what has been termed their inner ends with short supporting flanges 27, which are re@ spectively seated in pockets of different of the cup member 21 and held in place by combined fastening and conducting screws 28, which screws also respectively pass through the opposite legs 29 of a Y-shaped wire terminal plate 30, carrying a binding screwy 31 and seated in a recess formed in the outer side of the bottom of the cupmember 2,1. The outer or opposite polarity wire terminal plate 32 carries i in Figs. 7, 8 and scares the mit part 24 previously referred to, and also is equipped with a binding screw 23.

ln the embodimentY of the invention shown 9 the parts are shown laplied to an electrical molding receptacle essentially consisting of the separate base member 34, and a cup member 35provided with the plug-receiving socket 36, and also havingy the integral base flange 37 fitting over and housing the base member 34. in this form of the invention the mounting of the side contact strips is in all essentials the same as shown in Figs. 4, '-5 and 6 of the drawings, that is, the saidfj strips 8 extend through the bottom of the plug-receiving socket and are provided at their inner with short supporting anges 27 held to base member 34 by the screws 38,'and in metallic connection with one of the a terminal plates 39, which is equipped with w,

a binding screw 40. The opposite polarity wire terminal plate 41 is iitted to the member 34, carries a binding screw 42, and also has a nutelement 43 engaged by the combined assembling and conducting screw' 44 which passes centrally throu 4h the bot-- tom of the cap member 35 and ho ds in place the center plug contact plate 45.

Fig. 10 illustrates the use of three equally spaced side-crimped contact strips 8L an ranged within a receptacle body 46, said seyeral strips preserving a screw-thread rela tion and being in metallic connection with one of the wire terminal plates 47, the other wire terminal plate 48 the outer end part of tact 49.

Various other embodiments of the invention will suggest themselves to those skilled in the art.

l. In an electrical receptacle, a side plug Contact therefor consisting of spaced crimped metal strips arranged parallel to the anis of the receptacle body, the crimps of the separate strips being in complemental screwthread relation to form a receiving thread for the electrical plug.

2. Inlan electrical receptacle, the combi the center plug con nation with the receptacle body and the cen ter plug Contact, of a side plug contact consisting of separated crimped strips having their crimps in complemental screw-thread relation.

3. In an electrical receptacle, the combi nation with the receptacle body and the eenter plug contact, of a side plug contact ccnsisting of separated longitudinally arranged crimped metal strips, the crirnps of the sep arate strips being screw-thread relation.

4. In an electrical'receptacle, the` combiv nation with the receptacle body and the center plug contact, of a side plug contact conm sisting of separat-e crimped .strips of the disposed in coinplemcntal 1 being illustrated as, i

same length and set out of transverse aline- Iiient to bring the crimps into complemental screw-forming relation.

5. In an electrical receptacle, the combi- 5 nation with the receptacle body and the center plug contact, of separate side contact strips extending through the bottom ot' the receptacle body and having crimps arranged `in screw-forming relation.

6. In an electrical receptacle, .the combination with the receptacle body, of a centerv plugr contact, means for holding the center plug contact in position, crimped side con# tact strips, and means for holding said stri s 15 in position, said holding means respective y for said center plug contact and said strips being so arranged as tobe separated by the insulated bottom of the receptacle body.

7. In an electrical receptacle, the combi- :U nation with the receptacle body and the center plug contact, of separate side crimped Contact strips arranged in screw-forming relation and having supporting flanges at their inner ends, and a plate arranged to clampingly engage said supporting Hanges to hold the strips in position.

,8. In an electrical receptacle, the combi,- nation with the receptacle body and the center plug contact, 'of separate side contact strips extending through the bottom of the receptacle and having inner end portions.

over apping each other on the outer side of the body, and a plate clanipingly engaging said overlapped end portion.

In testimony whereof I hereunto alix my signature in the presence of two witnesses.

FRANK J. RUSSELL. Witnesses:


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2437373 *Sep 4, 1942Mar 9, 1948Bernstein Edward AFlashlight holder
US2640969 *Mar 29, 1949Jun 2, 1953United Carr Fastener CorpLamp socket
US3131987 *Sep 15, 1961May 5, 1964Circle F Mfg CoElectrical wiring device
US3360768 *Nov 2, 1966Dec 26, 1967Pass & Seymour IncScrew socket
US3955876 *Feb 3, 1975May 11, 1976Vossloh-Werke GmbhElectric lamp socket
US7234973Mar 23, 2006Jun 26, 2007Shelly Mark ELighting system having modified light bulb base and luminare socket for preventing the selection of an over wattage light bulb and method of forming same
Cooperative ClassificationH01R33/22