US1342787A - Grip-fitting for electric cord - Google Patents

Description

E..C. WHITE. GRIP FITTINGIOR ELECTRIC CORD'. y

APILICATION 'FILED AUG.26, ISIB.

\ PatentedJune 8,1920'.

' .JIIMIII IIILILlluy-Ig Ill ,JIIIILIIII III I IIIIIIII NETE!) mmm ERNEST CNTELO WHITE, OF NEW YURK, N. Y., ASSGNOR TG JULEXALITE CGR- PGRTON', Olf ll'Eli YORK, N. Y.. CORPORL'ION NEW YQRK.

Application filed August 2B, 1918.

' lVi-rrriz, a citizen or' the United States., re-

Ui. i

siding in the borough of liizrnliuttan, of the oit-y of New York, in the Stilte of New.`

York, lieve. invented certain new und useful Improvements in Grip-Fittings for Electric `Cords, of which the followingr is u specification, reference being lied to the accompanying drawinb, forming' n part hereof.

This I invention relates to tire nieunsby which the phj/seal connection between en electric lighting* cable und the lighting 5.xture et its lower end and between the euble` and tlie Canopy or its equivalent ut the upper end lis effected. The purpose is to provide an inexpensive means for causing the cable to be gripped tightly-'at the upper end of the lighting; fixture or et the lower 'end of the canopy' or its equivalent, as the euse may be. lleretoore, a split, rigid ring, of hard nieteriel, lies been formedzind mede to encircle tlie crible, being clamped thereon by u sleeve which forms e part of the lixture. either the lighting fixture or the canopy, the case muy be. Snel; split ring, of unyielding materiel, niust be fitted approximately to the cable and, in quantities.I in- Volves` a considerable expense in manufacture and ugplieation. ln accordance with 'the present invention, there is provided u ring of yielding.;` material u'liieli ie equeezed between the cable and e part of the fixture. The invention will be more fully explained hereinafter with 'reference to tbe aecompanying dre `ing, in which it is illustrated and in Wliicli-j Figure Fis a View, partly in vertical section and partly in elevation. of e lighting fixture, including tbe Canopy and the lump with its attachments and illustrating the upplieation of the inventionin connection with the lighting cable.

Figs. 2, 3 end 4 are detail views showing diflerent forms of the elastic ring referred to hereinafter.

Fig, 5 is e. detail View in section illustrating a slightly different embodiment of the invention from thatshown in Fig. l.

The improved supporting device can be applied wherever u cable is eonnected to e metal intuire, Whether it be the/ canopy, through wliieli the iixture is suspended .from the ceiling, or the lighting fixture itself. in-

cluding the lamp only, or the lamp and its" Serial No. 251,395.

appurtenances, lt eoinpriees e Coupling member fr. a. a?, which is Heem-ed to the lanipbr the canopy or other puri oi" lie iii;- ture 1n any oor 'enient niunner. le Shown in the upper part ot Fig. l. the coupling member c. is secured to the uf-:uul canopy by e nut of* which engages the tbremled nor-- tion of the coupling member 'u'itliiifthe canopy. As shown in the lou Er part et l? the coupling member a threaded directly into the lump Socket a". The coupling member of. sli. Wn in Fig. 5. is also adapted to be tlireuded into tire lzunp socket or int-1.1 u retaining' nut are the cese may be.

Another ineinliier ot the Suopor'tinp; device is u Sleeve al. d. (Z2 adapted to crowd 'the gripping ring hereinafter'mentioned into close Contact with the crible und udo; ed toA be drawn toward the coupling` member (l. of, a2, being preterublji" tuilvereil internally. fis: shown in Fig. l. the Sleeve formed with u nurrow lip d, adapted to be engaged bv un interni-il lip ff et n out /f .rliieli ie threaded :it upon the roi-responding tlirezided portion of the coupling member a. fr. As sliou'n in Fie'. 5. tlie tapered Sleeve r/L ie itself threaded:y us nt (Z4. flirei-tly upon the threaded portion of tbe 'eouplinje member a?. The lutter conf-:true n ini'eii'e :i smaller number of parte but it lies. es compared will] rise eonstruetion iio\\:n

Fig. l. tlie diudvuntege olf rei'iuiring`p rotation of the eleere [2 with respect to coupling- 'member if?.

l "inallyT the device includes resilient clamping ring. tittinuV ru about the cable r/. und plneed within tile L- ternnlly tapered nl, fl. al?. .so tiret it is caused to grip tbe Cable tightlyv und is forced more closely into eontuct ivitlrtlie cable by any relative movement oi the internulliv tapered sleeve and cable caused by the Weight of the suspended parte. libererebly the gripping ring ie oi' sott rubber and is circular in cross.' section, es shown et f in' 2. but it niiglit be of rubber and reetengular in cross section, slim-:n at' f" in Fig. 3, or it might be oli lielieelly Wound Wire, es Shown et f2 in .''i,c l- Obviously, :it might be made oit other materiels or lieve other shapes in .cross eeetion suited to tbe particular conditions of use. ln any ense. the elastic, yielding gripping ring is euueed bythe internally tapered sleeve to grip the cable gtiglitly. and the device will found to` be et"specialfadvantagehin connection with cables provided vvitujute laterals g', whiclr'are gripped tightly' by the action of grippingring and takeK the strain-due to tlieweight of the suspended parts, before the copper conductors stretch.

'ln assembling the supporting device, lixt'ure andfcable, the internally tapered sleeve is inserted in the. nut (referring to the construction ,shown'in Fig. 1) and the two are slipped upon the cable -with the open end toward the end oi' the cable. The-gripping `ring is then slipppd upon` the cable and the cable is passed t rough the coupling member a., a', and spliced to the lead or secured to .the lamp socket in the usual manner. Finally, the internally tapered sleeve, nut

and gripping ring are slipped upon the cablato a point near the coupling member, the gripping ring is crowded into the internaily tapered sleeve and the latter is secured to the coupling member by the nut, the gripping ring being thereby merely prevented from escaping from the internally tapered sleeve or crowded farther therein as the case maybe. lhe mode of use of the form ofthe device shown in Fig. 5 will be readily understood without further er;- 'planation than to state that the coupling member must be rotated relatively to the in- ,ternally tapered sleeve, to bring the two into engagement. As rotation of the intercally tapered sleeve might be injurious to tliegripping ring, the construction 'shown in Fig. 1 is therefore preferred because the rotation of parts in contact with the cable is not required.

I claim as my inventionz.

a, k11A grip fitting for electric cordsin- -cluding ya yielding, elastic gripping ring amare? having-.capacity `rfor roliing movement on the cable and. adapted to encircle the li hting cable snugly, a tapered sleeve encirc ing the gripping ring and crowding it into contact with the cable upon relative movement between the cable and sleeve thereby causing the ring to tend to rollA on the cable and means independent functionally osaid ring to secure the sleeve to the fixture and prevent the escape of, the gripping ring,

2. A grip fitting for electric cords including a yielding, elastic gripping ring having capacity for rolling movement on the cable and adapted to encircle the lighting cable snugly, a coupling m Amber independent functionally of said ring secured to the fixture, a tapered sleeve encircling the gripping ring and'crowding it into contact with the cable upon relative movement between the cable and sleeve thereby causing the ring to tend to roll on the cable, and means to secure the sleeve to the' coupling member.

3. A grip fitting for electric cords-includ ing a yielding, elastic gripping ring having capacity for rolling movement on the cable and adapted to 4encircle the lighting cable snugly, a coupling member independent functionally of said ring secured Vto the fixture, a tapered sleeve encircling the gripping ring and crowding it into contact with the cable upon relative movement between the cable and sleevel thereby causing the ring to tend to roll onthe cable, and a nut engaging the sleeve and the coupling memberto draw the sleeve toward the coupling member.

This specification signed this 21st day of August, A. D. 1918.

ERNEST CANTELO WHITE.

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