US1042348A - Electric attachment-plug. - Google Patents

Description

T MQHERSKOVITZ.

BLEOTRIG ATTACHMENT PLUG.

APPLIOATION FILED JUNE 14, 1912.

1,0423, Patented 0011221912.

' innit-nth snares FATENE enrich.

MAX HERSKOVITZ, OF CHICAGO, ILLINOIS, ASSIGNOB F ONE-HALF TO 0. W. HENGER,

OF WATERTGWN, CONNECTICUT.

ELECTRIC ATTACHMENT-PLUG.

Patentedflct. carers.

, Application filed June 14, 1912. Serialrl'o. 763,738.

To all whom it may concern:

Be it known that I, MAX Hnnsnovirz, a citizen of the United States, residing at Chicage, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Electric Attachment- Plugs, of which the following is a specification.

My invention relates to electrical attachment plugs and contemplates improved and more desirable construction.

My invention concerns particularly that class of plugs which comprise a body carrying conductor terminals, and a threaded sleeve rotatable on the body and in electrical connection with one of the terminals. As heretofore constructed, the body has a threaded neck extending through the head of the sleeve to be engaged by a threaded cap through which the circuit conductors enter to connect with the terminals on the body, this cap then looking the sleeve to the body but allowing rotation of the sleeve to.

enable it to be screwed into a socket without causing turning of the body. In practice, however, these caps are apt to bind on the sleeve to prevent rotation thereof, and turning or" the sleeve is also apt to wear on the conductor insulation. The cap, being of rubber, its threadsare easily broken or distorted so that the cap will no longer fit. It also requires time to apply or to remove the cap. A sin, in this prior form of plug, the sleeve oes not have the most eflicient electrical contact with its conductor terminal.

Among the objects of my invention are to provide a construction and arrangement which will dispense with the threaded neck on the body and with the separate cap; to provide a construction in which the sleeve is freely rotatable on the body but is always in eflicient electrical connection with its con connect the sleeve and body and in which the sleeve spring clamps to the body, this being obtained by providing a peripheral groove on the body and tongues or projections on the sleeve to snap into the groove to loch the sleeve to the body but to permit free rota- I tion' ofthe' sleeve; and in general, to provide s more simple and more desirable and 'efi eient plug.

In the accompanying drawings :Figure 1 1s a top view; Fig.2 is a side elevation;

Fig. 3 is 'a bottom view; Fig. -i is a side elevation of the body; Fig. 5 is a section on line 5 5, Fig. 1; and Fig. 6 is a section on line 6-6, Fig. 5.

The body 10 is a cylinder of porcelain or other suitable insulating material and has the longitudinal passageway 11 for one circuit conductor and the longitudinal pocket 12 for the other conductor. In the base of the body is a pocket 12 for receiving the binding screw 13, and the countersink pocket 14 "for receiving the terminal plate 15, the washer 16, and the head of the screw. A tubular rivet 16 is anchoredi-n the lower end of passageway 11 and holds the plate 15 in place, the conductor passing through the passageway and rivet to be clamped between the plate and the, washer.

Surrounding the upper end of the body is a sheet metal ring. 17 having the peripheral groove 18 and ridge 19, the ridge engag ing in a groove 20 in the body to thus secure the ring to the body. A. terminal plate 21 is secured to the ring 17 and extends downwardly into pocket- 14, a passageway 22 adjacent the pocket allowing the circuit conductor to be clamped to terminal plate 21 by the screw 23. I

The sleeve part'S comprises the cylindrical sheet metal shell 24 having the threads 25, the shell being deflected inwardly at various points near its upper end to form tongues or ridges 26 for engaging in the groove 20 of the body. lhe shell is sufficiently springy so that the ridges will readily pass over the ring and willsnap into the groove to then lock the sleeve in firm electrical engagement 7 with the ring while at the same time the sleeve can freely turn on the body to be screwed into a socket.

The upper edge of the shell is deflected inwardly to lie against the upper edge (if the ring, and is then deflected upwardly and outwardly toform the peripheral groove 27 for clamping the inner flange 28 of the cap 29. This capis of insulating material and i has the central opening 30 for the circuit conductors and is sulhciently raised over the body 10 to allowlrn'otting of the conductors if desired, or application of a cord grip for relievingthe, body terminalsof all strain.

'ihe periphery of the outer flange 31 onv the being then in 32 may be applied and tween the shell cap is knurled so that the sleeve structure can be readily turned to secure the shell in a socket.

In Fig. 4, the body is shown alone. When the plug is to be assembled, thecircuit conductors are passed through. the cap opening 30 and then into the passageways of the body and secured to the terminal plates. The sleeve structure is then slippedover the body and pressed down until the ridges 26 snap into the groove 18,'tl1e sleeve structure firm electrical connection with the ring 17 and withthe terminal plate 21 extending therefrom. The sleeve structure being freely rotatable on the body after clamping thereto, the shell 24 can be readily screwed into a socket to engage one terminal thereof and to carry the body end terminal into engagement with the other terminal of the socket.

To disconnect the sleeve structure and body they are merely pulled apart and 110' relative turning is necessary. In order to insulate the outer end of the shell which will be outside of the socket, an insulating ring held in place bethrcads and the cap. Inscrtion of the plug into a socket can thus be safely accomplished.

I thus produce a siinple yet substantial plug having a minimum number of parts and having a most eilicient electrical arrangement.

I do not desire to be limited to the construction modifications are possible which would still come Within the scope of my invention.

I claim the following:

1. In an electrical attachment plug, the combination of a cylindrical body having 'a peripheral groove, and a sleeve having projections for engaging in said groove to norexact mally hold the body and sleeve together but to allow free relative rotation thereof, said groove and projection connection being yielding-to allow the parts to be separated by abnormalv pull thereon.

vf2. In an electrical attachment plug, the combination of a cylindrical. body of insulating matcriah'contact terminals on said body, a ring surrounding said body'and having a peripheral groove and a threaded said terminal and arrangement shown as noaaeae metallic sleeve fitting over the body and one of said consaid ring being 3. In an electrical attachment plug,the

combination of a cylindrical body carrying terminal contacts and having a peripheral groove in a plane at right angles to the body axis, and a threaded metallic sleeve fitting over said body and having a projection for cooperating with said body groove to lock the sleeve to the body but to allow free rotation thereon, said sleeve when applied being in electrical engagement withone of contacts.

a. In an electrical attachment plug, the combination of a cylindrical body of insulating material, an end contact and a side contact carried by said body, a metallic, head for said body having a peripheral groove concentric with the body axis, a threaded cylin-v drical shell receiving said body and-having inner projections groove to lock the allow free rotation shell when applied to the body having electrical connection with said side contact on the body.

5. In an electrical attachment plug, the combination of a cylindrical body part, a cylindrical threaded sleeve part,'0ne of said parts having a-groove angles to its axis and the other part havmg a projection for engaging at any point in said groove-to lock sald parts togetherbut to allow relative rotation thereof, said sleeve part forming one electrical terminal of the plug and said body mounting the other terminal of said plug, and a cap rigid with the sleeve coverin the outer ends of said sleeve part and p mg and having an opening for circuit'conductors.

In. witness whereof I have signed my name for engaging in said shell to the body but to to the foregoing specification in the presence I of two subscribing witnesses.

MAX HERSKOVITZ.

Witnesses:

R. J. JACKER, M. J. MOKEND Y.

Copies of this patent may be obtained for five cents each, by Washington, 3). G.

addressing the Commissioner of latents,

thereof on the body, said in a plane at ri ht

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