US1564871A - Electrical connecter device - Google Patents

Description

Dec. 8, 1925.

s. M CLATCHIE ELECTRICAL CONNECTER DEVICE Filed Jan, 16. 1920 fltiawneys on the line 3-3 of Fig. 2;

Patented Dec. 8, 1925.

UNITED STATES STANLEY MccLA'rrcHIn, or oiuvrnnrnen, MASSACHUSETTS, nssrenon. To BENJAMIN ELECTRIC MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

ELECTRICAL CONNECTER DEVICE.

' Application filed January 16, 1920. Serial No. 351,820.

To all whom it may concern:

Be it known that I, STANLEY MOCLATCHIE, a citizen of the United States, residing at Cambridge, in the county ofMiddlesex. and State of Massachusetts, have invented new and useful Improvements in Electrical Con necter Devices, of which the following is a.

full, clear, concise, and exact description, reference being had to the accompanylng drawing, forming apart of this specification.

My invention relates to electrical connecter' devices. More specifically, it relates to swivel attachment plugs.

Among the objects of my invention are to provide an. improved swivel attachment plug which can be easily wired, and in which the wiring connections are well made, which can be conveniently handled, and which will be simple in construction, easy to manufacture and durable and efficient in use.

Another object of my invention is to improve certain features of construction of electrical connecters.

Further objects will appear from the detailed description to follow and from the appended claims.

In the drawings in which an embodiment of my invention is shown by way of illustra-,

tion: r

Fig. 1 is a side elevation of an attachment plug; 7

Fig. 2 is an axial section of the plug shown in Fig. 1;

Fig. 3 is an axial. section of the plug Fig. 4 is a side elevation of terminal carrying portion "of the plug;

Fig. 5 is a plan View of theplug with the cap removed, Fig. 6 is a sectional view showing the manner in which the binding terminal carrying portion is removed fromthe threaded shell, and

Fig. 7 is a bottorn'viewot the binding terminal carryingportion.

In order to give a general idea of the construction shown, it is here stated that the connecter device illustrated comprises a two-part insulating base 10, which supports the center contact 11, and a pair of Wiring terminals, and a threaded shell contact 12, having an inwardly extending flange portion18, which is held in place by and between the two parts of the insulating base tact.

the binding tially inside the threaded shell contact 12,

which supports the wiring terminal 15 for the center contact, and a cap portion 16 lo- 3 cated outside of the threaded shell contact, for supporting thecenter' contact 11.

The construction is such that when th cap 16 is disconnected from the body portion 14, th body portion can be removed from the threaded shell contact 12 by working it past the inwardly extending flange portion 13 of the threaded shell contact, and such that in wiring the plug the threaded shell contact 12 with the thumb piece 17 can he slipped on over the feed wires,'the ends of these wires brought into their proper position with respect to the'wiring terminal parts carried by the body portion 14, and this body portion 14 then worked into place within the threaded shell contact past the flange portion 13 of this threaded shell conpast the flange portion '13 is shown in Fig. 6, and is accomplished by a relative tilting movement between the body portion and the threaded shell contact, which will be scribed in detail later.

After the body portion 14 has slipped into place past the flange 13, thecap portion 16 is put in place, and secured to the body portion 14, this'connection between the parts 14 and 16 serving to hold the parts together in their proper position with'respect to each other and the threaded shell contact 12'. As shown in Fig. 3 the binding screw 15 for the center contact 11 is in axial alignment with said center contact, both, the center contact 11 and the binding screw 15 being threaded into an eyelet 18, which extends through an opening in the body portion 14. In order to prevent the end of the feed wire, 19, which is connected with the binding screw 15, from being jerked out from under the head of this binding screw, and in order to relieve this binding screw from the strain, a strain-relief mem ber2O is provided, which comprisesa metal stamping which is secured to the body portion 14 by means of the eyelet 18, into which the binding screw 15 is threaded. The bared' end of the feed wire 19 is 'secured under the head of the binding screw 15 and is then'looped up over this strain- This working of thebody portion 14 head of the screw 15, brought around over the strain-relief member, and through the opening 21' in the thumb piece. This bending of'the feed wire around the strain-relief member prevents any considerable pull being exerted on that part of the wire which is adjacent the binding screw.

The thumb piece l7 has an annular inwardly extending insulating barrier portion 22, which cooperates with a barrier portion 'or projection 23 on the insulating body 1 1 to keep the stray strands ofthe wire 19 from getting into engagement with the threaded shell contact 12.-

As shown'in Figs. 1 and 2, the feed wire 24 for the threaded shell contact is clamped between the insulating. body 14 and the cap 16 and thus forced firmly into engagement with the annular sliding contact member 25, which is'secured to the cap 16. The sliding contact member 25 thus acts as-a terminal for the feed wire 24. This clamping of the feed wire 24 between the two parts of the insulating. base is accomplished simply by screwingthe center contact 11 into the internally threaded eyelet 18. In order to insulate the bared end of this feed wire 25 from the center contact screw 11, the in sulating body 14 is provided with an upstandingannular flange or barrier 26, which surrounds the, screw 11 when the parts are in assembled position, the bared end of the feed wire 24 being wrapped around this annular barrier as shown 1n Figs. 4; and

5. To further insure against stray strands of the ends of the wire 27 getting into engagement with the center contact screw 11, the cap 16' may be provided with a downwardly extending annular flange or barrier portion 27 which' extends downwardly into the annular space between the center contact screw 11' and the annular barrier 26. The annular barrier '26 fits in a corresponding recess in the cap, this interfitting part servingto center the cap withrespect to the body portion 14, to facilitate assembling of the parts, and to enable the center contact screw ll to be lined up with the bushingv 18: The annular-barrier 26 also serves -asa handle to assist; in removing the body 13' with respect to the threaded shell contact 12, as will be shown in Fig. 6.

In order to prevent the ends'of the feed wire 24 from being jerked out from enga gement, and in order to release the strain on this binding terminal construction, the body portion 14; is provided with a. tortuouspassage 28 (Figs 6 and 7) in which the feed wire 24 is laid, the stemsin this passage serving to relieve the binding terminal; from strain.

The sliding contact member 25 maybe a sheet metal stamping secured in place on the cap 15 by being flanged over as indicated at 29. The-threaded shell contact 12 may be secured to the thumb piece 17 by screwing it thereon, and pressing the shell contact into reoessesin the thumb" piece 17 as indicated at 30.: (Figs: 3 -and-5-.)

Referring again to the tortuous passage 28, I have designed this so that it can e formed by an inwardly extending projection on the die, meeting and passing an inwardly extending projection on the matrix, as the partis being molded- As shown in Fig. 6', the side wall 31' at the upper portion of the tortuous passage is in alignment with the opposite" side wall 32 at the bottom of this tortuous passage. Theupper portionof the passage is formed by an inwardly extending projection on adownwardly movingdie, the end of which extends as far asthe portion33 of the passage, and the lower portion" of the passage 28 is formed by an inwardly extending projection on the matrix, the upper end of which extends up to the portion 34 of the passage, the edge ofthe inwardly extending projection on the die meeting and pass ing the upper edge of the inwardly extend ing projection on the matrix. 1

I will now describe more in detail the con'. struction whereby the body portion 1 1 can be slipped into and out of the threaded shell contact As shown inFigs. 2, 6 and 7, this body portion 1a is providedwith an el lipitica l flange portion the smaller diameter of which elliptical flange is less than the diameter of the circular opening: in the flange 13of the threaded shell contact, and the major diameter of which elliptical flange is greater in diameter than the diameter ofthis circular opening. in the flange of the shell. This elliptical flange thus constitutes in effect tW'ZO: laterally extending. wing. portions", which can be caughtunder the circular flange 13, by sidewise and tilting movement of the body 15-1 with respectto theshell cont-act. v

After the body portion 14 has been 10- catedein its properposition in the shelhcontact 12, with both sides otthe flange 35 caught under the-flange 13, the-cap 1 6 'is slipped in place onto the' body portion -1 1, and the center contact screw 11 is: screwed into the bushing 18 to draw the two parts of the insulating base substantially together to clamp the feed wire24 firmly in place, and to hold the-parts of the hasetogether. This screwing in of the screw 11 clraws' tl1e circularshoulderportion 36 of the base 14 up into-thecircular openihginthe flange 13 of the threadedshell contact and thus centers theinsulati-ng. base with respect to the shell con-tact.- v

I The method of wirin'g' andthe circuit has been indicated in connection withthe description of the construction.

The plug is 139 wired by slipping the thumb piece 17 and the insulating shell 12 over the ends of the feed wires 19 and 24. The end of the feed wire 19 is then secured under the head of the binding screw 15, and the wire is looped up over the strain-relief member 20. The wire 24 is then placed'in the tortuous groove 28 and the bared end wrapped around the The circuit is from the cent-er contact 11 through the bushing '18, feed wire 19,

through whatever translating device is connected with the plug, to the feed wire 2t, and thence through the sliding contact member 25, to the threaded shell contact 12.

This application is a continuation as to common subject matter claimed herein of 'iny copending application Serial N 0. 284,113, 1

filed March 21, 1919. 7

Having thus described my invention, what I claim as new and desire to secure by Leo ters Patent of the United States is:

1. A swivel attachment plug comprising a swivel contact, having an inwardly ex tending annular flange at its entering end, a two-part insulating base, the parts having portions located 011 opposite sides. of the flange respectively, for positioning the c0ntact withrespect to the base and binding terminal members and a center contact sup ported by said base, said center contact construction comprising a screw, the wire for the shell contact being clamped between the parts of the base by the action of said center contact screw.

2. Abinding terminal construction comprising a binding screw beneath the head of which the wire is caught, a strain relief member around which the wire is bent and an eyelet for securing'said strain-relief member in position, said binding screw being threaded into said'eyeletr 3. A swivel attachment plug comprising an insulating body, and a contact swiveled on said body, said body being divided transversely into forward and rearward parts, means for securing the parts together w th an annular space therebetween, said contact 1 having a flange'extending into saidannular space to restram'axial movement of the contact relative to the body, the 'rearwardpare of the body having a diameter sufiiciently small to 13617111311] to" be inserted into said contact through the forward open end there of, and having an eccentric portion for ex tending'behind said flange whenthe rearward part has entered the contact,

4:. A swivel attachment plug comprising an insulating body and a contact swiveled on said body, said bodyt being divided transversely into forward and rearward parts, means for securing the parts together with an annular space'therebetween, said contact having a flange extending into said annular space to restrain axial movement-ofthe shell relative to the body, the rearward part of the body having a diameter sufficiently small to permit it to be inserted into the contact through the forward opening thereotand .1

having an eccentric portion extending behind said flange when the rearward part is centered inthe' contact, one of said body parts having a projection to fit into. said flange to center both parts ofsaid b ody,'the parts being connected together by said means In witness whereof, I have hereunto sub scribed my name.

STANLEY MGOLATGHIE.

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