US1571727A - Attachment plug - Google Patents

Description

' S. MCCLATCHIE ATTACHMENT PLUG Filed July 3, 1920 Patented Feb. 2, 1926. y

UNITED STATES PATENT oEFlcE.

STANLEY MCCLATCI-IIE, OF CAMBRIDGE, MASSACHUSETTS, ASSIGNOR TO BENJAMIN ELECTRIC MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

Application tiled July 3,

To all whom it may concern:

Be it known that I, STANLEY MCCLAT- Crim, a citizen of the United States, residing at Cambridge, in the county of Middlesex and State of Massechusetts, have invented new and useful Improvements in Attachment Plugs, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this speciiication.

My invention relates to electrical connector devices, and more specifically to swivel attachment plugs.

One of the objects of my invention is to provide a swivel attachment plug, which will be etlicient and durable in use, easy to wire, simple in construction and cheap to manufacture.

Further objects will appear from the detailed descriptionto follow and the appcnded claimsV In the drawings in which an embodiment of my invention is shown,"d

Fig. 1 is an axial section of an attachment plug;

Fig. 2 is an axial section on the line 2 2 of Fig. 1;

Fig. 3 is a. plan view of the plug;

Fig. l is a transverse sectional view of the plug on the line 4l-fl of Fig. 1;

Fig. 5 is a transverse sectional view of the plugou the line 5 5 of Fig. 1.

The construction shown in the drawing comprises in a. general way an attachment plug having shell and center contacts 10 and 11 respectively, wiring terminals 12 and 13 for the contacts 10 and 11 respectively,

an insulating handle or thumbpiece 14E detacha-bly secured to the threaded shell contact 10 and an insulating base 15 for supporting the center contact 11 andthe binding terminals 12 and 13 and for insulating the center contact 11 from the shell con tact 10.

In order that the threaded shell contact 10 can be screwed into a socket without twisting the cords secured to the binding terminals 12 and 13, a swivel connection is provided between the insulating base 15 which supports the wiring terminals and the threaded shell contact. This swivel connection is effected by providing the threaded 1920. Serial No. 393,972.

shell contact 10 with an annular channel portion 16, in which is swiveled an annular' swivel contact member 17, which is secured to an annular flange portion 18 ofthe insulating base 15. This annular swivel contact member 17 may be formed as a part of an integral sheet metal stamping having a conducting strip portion 19 extending downwardly therefrom and secured to the binding plate member 2O of the wiring terminal 12 in any suitable manner, as by means of rivets 2l.

The center contact 11 may be formed as a" flange portion of a tubular externallythreaded eyelet member 22 secured in place on the insulating base 15 by means of a nut 23. This nut 23 also serves as-a binding plate member, the bared end 24 of the feed wire being clamped against this nut 23 by means of another nut 25, which is also threaded onto the eyelet 22.

In order that the bared end 241 of the feed wire may be secured in place underneath the nut 25, both the eyelet 22 and the upper nut 25 are slotted as indicated at 26 and 27 respectively. In wiring this terminal 13, the bared end 24 of the wire is passed up through the eyelet 22, the upper nut 25 is turned until the slot 27 registers with the slot 26 in the eyelet, the end of the wire is bent over and drawn down through these slots to a. position underneath the nut 25, and y,

the end is then Vwrapped around` the eyelet,

and the screw 25 is screwed down to clampV the wire between the nuts 23 and 25.

In order to relieve the wiring terminal 12 from strain, the insulating base 15 is provided with an integral yokeshaped portion 27 a (Fig. 1) comprising a cross-bar or saddle portion 2S (Fig. 2) over which the feed wire 29 is looped, the bared end 30 of this feed wire being brought down and secured down underneath the head of the binding screw 31.

This cross-bar 28 and the opening for the eyelet member 22 are so proportioned as to facilitate the die-molding of the insulating base 15. As shown in Fig. 2, the width of the opening for the eyelet 22 is the same as the width of the cross-bar 28, so that a projection on the upper die can enter between two side faces of the lower die and slide along these faces, the upper face ofthe cross f bar 28 being formed by the lower face of this projection on the upper die.

In order to detaehably connect the insu'- lating thumb-piece 14 to the threaded shell contact 10, the insulating thumbpiece is provided with an externally-threaded ,annular flange portion which is threaded into the lower end of the shell contact 10. In order to prevent the thumbpiece 14 from accidentally becoming disconnected from the threaded shell contact 10,l the thumbpiece is provided with a recess 33 into which extends a projection Sel: struck up from the `lower portion oit the threaded shell contact 10. lVhen it is desired to disconnect the thumbpiece from the threaded shell contact, the projection 34 can be readily disengaged from the recess 83 to permit the thumb piece to be unscreu'ed from the threaded shell contact.

The annular sliding contact 17 is secured in place in the channel portion 16 by lang ing over` the upper edge of the threaded shell contact member after the parts are in assembled position. After the parts arek once thus assembled, it is not necessary to disconnect the threaded shell contacty from the sliding Contact member 1T ior Wiring, as the vWiring can be accomplished Without this disconnection. In Wiring the device the insulating thumpiece 11iis unscreived rfrom the threaded shell Contact 10 and slipped on over the ends ot the 'feed Wires. One o't the feed Wires is then slipped up through the cyelet 22 and secured in place underneath the nut i5 as previously described. r[he other feed Wire is looped over the crossbar or saddle 25 and the ends brought doivn and secured underneath the head of the binding screw 31. The thumbpiece 14 is then slipped up on the feed Wires and screwed into the threaded shell contact 10, the projection Sii snapping` into place into the recess 33 to prevent the parts from coming unscreived. In screwingthe threaded shell contact m the socket the cord will not be twisted as the insulating base 15 which supports the Wiring terminals for the cord has a swivel connection with the threaded shell contact.

Having thus described my invention, What I claim as new and desire to secure by Le'.- ters Patent is:

1. An attachment plug comprising a side contact, a tubular member having a portion forming a center Contact, the bore of the tubular member providing a passage for the conductor for the center contact, and said plug having provisions for securing said conductor comprising a nut threaded-on said tubular member.

,2. An attachment plug comprising a side contact, an insulating body Within said side contact, a tubular metal member extending through said body, said tubular member having a portion forming a center contact, the bore ot said tubular member a'ording a passage for the conductor, said tubular member being provided With a lateral passage 'for the conductor, and means for securing the end of said conductor, comprising a nut threaded on said tubular member.

3.. An attachment plug comprising side and center contacts, and a body ot insulating material comprisingl a cap portion for supporting the shell and center contacts in proper position with respect to each other and insulating them `from each other, and a yoke portion extending from said cap portion, and a Wiring terminal supported by said yoke portion, the cross-bar of said yoke alibi-ding a strain relief means over which ythe conductor leading to said Wiring terminal is looped, said cap portion having an opening in which the center contact is secured, said opening being in alignment with and leading to the opening above the crossbar of the yoke port-ion in which the center contact is secured. y

In Witness whereof', I have hereunto subscribed my name.

STANLEY MCGLATCHIE.

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