US965206A - Incandescent-lamp socket. - Google Patents

Description

N. MARSHALL.

INGANDESGENT LAMP SOCKET.

APPLIOATION FILED 001219. 1908.

Patented iuly 26, 1910.

UNITED STATES, PigrENir oFFIoiE.

" NORMAN MARSHALL; OF NEWTON, MASSACHUSETTS, ASSIGNQR, BY MESNE ASSIGN- vMENTQTO ARROW ELECTRIC COMPANY, OF HARTFORD, CONNECTICUT, A CORPORA- TION or CONNECTICUT.

T all whom it"ma g conccrn: 3e 1t known that. I N()RMAN li IARSiLiLL,

f 'wn of the United States,'residing at Newton, in the county-of Middlesexand State of Massachusetts, have invented certain new and useful Improvements in Incandescent-Lamp Sockets; and'I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in, the art to which it appertains to make and use the same The invention relates to incandescent lamp socketksuch as are adapted'to be se cured in position upon fixtures. Fixture sockets have usually been pro vided with a screw threaded nipple adapted to be screwed upon the threaded. end of an arm or pipe on the fixture and'to engage a shoulder on the fixture arm. The socket.

nipple has also been provided witha set screw .adapted'to l)e"scre\ved against the nip- "ple of the fixture to assist in retaining the' socket in position. It is usually desirable. in securing sockets to fixtures; and particularly in the better grades of work, that the key of the socket shall be located in a predetermined fixed position relation to the fixture. 'With the fixture 1 sockets asusually constructed, when the. socket nipple is screwed tightlyagainst the Ifshoulder of the fixture arm, the key seldom comes in the desired position. It is necessary, therefore,-

to either back off the socket until the key is" brought into the desired position, or to file away the end of the nipple by a cut'and try method until the key comes in the desired position when the nipple is.screwed tightly against the shoulder on the fixture arm. In the first case the backing olfof the socket renders it Mose; so thatit will not set square with the fixture, and the set screw forms an inefficient securing device- 139p retaining the socket in position on the fixture arm. Iii

cases where a husk or cover is used in connection with the socket, the set screws can seldombe reached, and the socket is either.

lcftloose upon the fixture, or the cut and try method: o.f bringing the key into the de-' Specification of Letters Patent'. Application filed October 19, 1902;. $eria1 No. 458.463.

INCANDESCENT-LAMP SoCKET.

Patented July 26, 1910.

0 a sired position has to be resorted to. The

second or out and try method of positioning the socket is tedious and unsatisfactory, and the time' required for thus," securing, the socket upon the fixture frequehtly causes the cost of applying the socket to exceed many times the orlginal cost of the socket:

It has been proposed to provide tom the proper positioning of 'the key with Irelation to the fixture by forming multiple fastenings upon the cap and shell of the socket, so

that when the nipple of the socket cap is firmly screwed .a a nstthe shoulder onthe fixture arm the s i'ell may be secured to the cap in any one of a number of diifereiitpo sit-ions. This construction does not permit, however, of the exact adjustment of the key with, relation to the fixture, and it has been found that the socket caps are likely to be broken in applying them to the fixture, since the wrench used for this purpose is tonstructedto engage the thin outer wall of the socket cap.

It is accordingly one object of the present invention to provide a fixture socket which may be readily and conveniently secured against the shoulder of a fixture, with the key located'iu any desired position in relation to the fixture.

To-this end one feature of the invention consists in providing a key socket with .means for securing the socket agaii st il shoulder on a fixture with the key in any predetermined position in relation to the fixture.

In its broader aspects the invention contemplates the provision of any-suitable.se

eur irigmeans which will enable the socket to be :firmly secured against the shoulder-of the fixture arm, and at the same time will enable the key tobe located in any desired position when the socket is thus secured.-

In its preferred form the invention contemplatesthe provision of a swivel connec tion between the cap of the socket and'the means for securing the socket/t0 a fixture which will enable the position ot the cap with relatio'nl to thefixture to be yaried as desired in bringin the nipple of the cap firmly against the s .oulder on the nipplepf the socket, or against the huskjjorucover nterposed between the shoulderiendythc mp ple of the socket. This featuresjif'the in-''..

husks or-covers, and under conditions which render the securing of the usual construction of socket caps to the fixtures inconvenient and difiieult.

- The securing means which I preferto employ in embodying the invention in a simple and eflicient construction which may be employed in eitherkey or keyless sockets consists of a swivel nut adapted to be secured locating t upon theend of the fixture arm and to firmly bind the socket cap in position upon the fixture. -In its preferred construction, the nut is also provided with devices for .engaging [a wrench, the employment of which facilitates the proper positioning of the socket cap, and the securing'of the cap upon the fixture arm.

The various features of the invention will be readily understood from an inspection 0; the accompanying drawings, in which Figure l is-a perspective view illustrating the manner of applying the cap of a socket embodying the lnventlon to the end of a fixture arm, and within a surrounding husk -or cover; Fig. 2 is an elevation showing a key socket embodying the invention secured in position upon the end of a fixture arm; Fig. 3 is an enlarged sectional view of a socket cap embodylnga different form of the invention; Figmt is an enlarged sectional View showing the upper part of a socket cap embodying another; form of the invention; and F gs. 5 and 6 are views of a wrench for conveniently applying the socket'c'a to the fixture arm and properly he key of the socket. The socket shown in Fig. 2 comprises the shell 1 and cap 2 for inclosing the base.

which su ports the current carrying arts, the shell being provided with'lthe usua slot through which the key? of the socket projects radially. The ca and. shell may be provided with interloc ingeatches of any suitable construction. In the construct on shown, the cap is provided with 'two nwerdly extending projectionsarranged diaopposlte to each other, one of which'is indicated at 4 in Fig. 1.":1

Infthe embodiment of the invention shown in Fig. 2, the cap of the socket is provided with-a nut ,5 which is mounted toturn within the-nippleorhub 6 of theso'cket cap. In

,this'jeonstructionfthe nipple'rof the socket cap is-formedby carrying up the thin walls of the socket cap so that they surround the nut 5, and turning in the upper edge of the end of the nut, an adapted to e clamped between the end of the nut and the shoulder .or flange '8 on the end of the fixture arm, or .to be clamped between the end. of the nut and a husk 9 in case a husk is interposed between the shoulder on the socket arm and the nipple of the socket cap. The nut is :provide with an annular groove, and the wall of the cap is bent to form an inwardly projecting rib 10 which engages the groove and retains the nut in the ca The inner or slots 11 for the reception of projections on a wrench to be described.

In the construction shown in Fig. 3, the nipple 14 of the socket cap is in the form of a metal sleeve which is secured to the thin sheet metal of which the main bed of the shell is formed in substantially tie same manner that the screw threaded nipple is secured to the body of the cap in the usual construction of socket. The nipplefll t is provided with a .reduced portion'1,5 which fits within an opening in the body 16 .of the socket cap. The wall of the socket cap about the opening is bent to form a recess within which an annular ring 17 fits. The inner surface of the ringis provided with a pluralit'y of grooves, and the socket body is provided with fingers which are bent downward into these grooves. The lower end of the reduced portion 3.5 of the nipple is bent outward to firmly bind the socket cap against the shoulder formed on the nipple, and to securely bind the projecting fingers of the socketgbody within the grooves in the ring 17 ,(ahdyto: bind the ring in position. In this elit st-notion the swivel nut 18 is mounted *witlnn'the. nipple 14, and the-upper end of the nipple is provided with a flange 19 extending in over the upper end of the nut; The nut is provided at its lower end with an outwardly projecting flange 20 whichunderlies the lower end of the nlp le 14. The inner end of the nut isprovi ed with slots or recesses 21 for connecting it with the wrench to be described. The flange 20 may be constructed to be engagedby the allowing it to turn-with relationzthereto'.

In the construction shown' in-'Fig. 4 thenipple 23 is secured to the main bodyof the cap in the same manner as; deseribed with reference to Fi' 3. In this construction the swivel nut 24 is provided at its upper end with an outwardly projecting flange 25 within a recess in the upper end: of the nut within the nipp In Figs. 5 and 6 a'wrenchfils shown,

end of the nut is provided wit 1 two recesses.

wall to form a flan e 7 overlyin the upper innerv edge of the cap lining 22, so that the lining actsto hold the nut in the cap, while lying nipple 23,-this flange a'ctlng to retain the the use of which the socket. cap may be readily and accurately securedto a fixture. This wrench comprises a head 26 adapted to fit within the socket cap, and this head is provided with two slots o-rfrecesses 27 within which the rejections L of the socket capfit, so that-t e cap is accurately positioned upon the head. The head-1s pro-- vided with a radially projecting arm .28 whieh'is so arranged with reference to the positioning recesses 27 that its positipn with relation to the cap when the cap is on the head 25 corresponds to the position of the key of the socket when the shell is connected with the cap. The nut turning part of the wrench consists of a shaft 29 vexte ding through thecenter of the head 26, an provided on its front end with two projections upon the head of the wrench, the cap is applied to the fixture nipple, the arm 28 be ing held in the position where it is desired that the key of the socket be located. The

' nut is then screwed on to the nip 1e of the .in place.

fixture by turning the shaft 29 of t e wrench until the cap or cap and husk are firmly secured against the shoulder-on the fixture arm, the key locating arm'28-being retained.

in position where it is desinedfthat the ,key of the socket be located. The, wrench-is then removed from. the socket cap. After the socket'has been wired, and the socket shell is attached to the cap, the key of the socket will come in the exact position where the locating arm 28 was held during the attachment of the socket cap to thefixture.

With this construction, keysockets may be quickly and firmly secured'to fixture arms and the key located in any desired position with relation to the fixture. This construction also enables the caps of keyless sockets to be quickly and conveniently secured upon the ends of fixture arms within husks or covers, which would render the'securing of the ordinary socket cap to the fixture arm inconvenient and difiicult. In screwingthc socket firmly on to the fixture the torsional strain comes on the nut and not upon the thin partof the cap, and there is no danger of injury to the ea in screwing it firmly The slot. in the inner end of the nut enables the nut to'be operated by an ordinary-screw driver if occasion requires.

VVhi'le I prefer to employ a" construction and arrangement of parts such as shown in the drawings, it will be understood that the broader features of the invention are not llmitcd to the specific construction and arrangement of devices shown and described,

and that such construction may be varied and modified without departing from the invention.

Having explained the nature and object of the invention and specifically described certain constructlons in which the invention may be embodied, what I claim is 1. Avkey socket PI'OVidQXl'hVitll means for clamping the socket against a shoulder on a fixture with the key in any predetermined position with relation to the fixture, substantially as-described.

2. A key socket provided-with a swivel nut for clamping the socket to a shoulder on the fixture with the key in any predetermined .position with relation to the fixture,

substantially as described.

3. A socket provided with a swivelnut for clamping the socket in position against the shoulder on a fixture, substantially as described.

4. A socket, having, in eombination,a shell, a cap-provided-with a nipple, an a. swivel nut for clamping the ni ple of the socket against a shoulder on a ixture, sub-' stantially as described.

5. A1socket, having, in combination, a key, a shell, a cap provided with a nipple, and a swivel nut for clamping the nipple against a shoulder on a fixture, substanti. 1y as described.

6.'A socket, having, in combination, a

socket cap, means for clamping the cap "against a shoulder on a fixture, and a swivel connection between the cap and clamping means, substantially as described.

' 7. 'A socket provided with a swivel nut for clamping the socket against a shoulder on a fixture, and wrench engaging devices on the inner end of the nut, substantially as described. r

8. The combination with a fixture having an externally threaded hub and a flange of acap having a hub adapted to engage the flange of the fixture and having an annular shoulder, and a nut adapted to clamp the hub of the cap between itself and the flange on the fixture and having a shoulder engaging the shoulder on the cap, and means for retaining the nut in stantially as describe 9. The combinationwith a fixture having an externally threaded hub and a flange, of a cap having a hub ada ted' to engage the flan e of the fixture and aving an annular shou der and a nut adapted to clamp the hub of the cap between itself and the flange (place inthe cap, subon the fixture and having a shoulder adapted to enga e the shoulder on the capsubstantially a s deScribed.

10. The combination with a fixture having an externally threaded hub and a flange, of a cap having a hub adapted to engage the fian 'e oft-he fixture, a nut adapted to clamp the hub of-the Gap between itself and the flange on the fixture and provided with an annular groove, and an inwardly extending annular rib on the hub of the cap engaging said groove to retain the nutin place in the cap, substantially as described. 10

' In-testimony whereof I afiix my signature, in presence of two witnesses. v

NORMAN MARSHALL. Witnesses:

jM. L. GiLMAN,

MCPIIAI a

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