US 1720619 A
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Description (OCR text may contain errors)
July 9, 1929. E. w. BALDWIN SWIVEL FOR LIGHT AND DROP CORDS AND THE LIKE Filed April 2, la
6 2 Sheets-Sheet W Hm. W.,
INVENTOR ATTORNEY July 9, 1929. E. w. BALDWIN SWIVEL FOR LIGHT AND DROP CORDS AND THE LIKE 1926 2 Sheets-Sheet Filed April 2 ATTORNEY Patented July 9, i929.
UNITEDA STATES PATENT oFFicE.
ELDON4 BALDWIN, OF NAMPA, IDAHO,l ASSIGNOR OF ONE-HALF TO JOHN C.
' SEWELL, OF NAMPA, IDAHO. i
SWIVEL FOR LIGHT AN D DROP CORDS AN D THE LIKE.
Application led April 2,
The present invention has for its purpose to provide, in a swivel fixture for light and drop cords and conductors to other electrical devices, a construction of two sections forining the swivel, with means for swivelly uniting the two sections, thereby preventing the f cord from twisting and winding up, more especially should the cord be of great extent in length.
Another purpose is to provide means for fastening the wires oit' the cord to the two sections of the swiwel, the two sections consisting of insulating material, with imbedded conducting means therein for insuring the l5 conduction of electric current.
Still another purpose is to provide antirictional means between 'the two sections of the swivel, to allow the two sections to freely inove.
further purpose is to provide yieldable contacts between the two sections 'of the swivel, certain of the contacts being in the :torni oi a circular ring, so that when the sections relatively swivel, the contacts remain engaged at all times.
ifi further purpose is a provisionfand means for perinittino` two. 'three or four wires to be f* b ponnected to the sections or" the swivel,"and yet permit the sections to swivel relatively to each other.
It is to be understood that the particulars herein given are in no way liniitive and that while still keeping within the scopeof the invention, any desired modifications of detail andV- desired proportionsmay be made in the apparatus according to circumstances.
The invention comprises further features and the 'combination of parts, as will be vhereinafter set forth, shown'in the drawings and claimed. 'f
In the drawings Figure 1 is a view in elevation ofy an electric light drop cord, showing the vimproved `Swivel!connecting the two sections of the cord. Figure 2 is an enlarged detail sectional view through the swivel.
Figure 3 is aiplan end view of oneiof the sections of the swivel, showing the yieldably mounted contacts.
l VFigureA is an end plan view on' the other 1926. Serial No. 99,397.
nated. 6o l Figure 7 is a sectional view Online 7 7 of Figure 6.
Figure 8 is a detail view showing the swivel as mounted on a screw plug.
Figure 9 is a view in elevation or" the swivel as mounted on a push plug.
Figure l0 is an end View of one section of the swivel, showing three circular contact rings in addition to the center stationary contact, so that four conductors or leads may be connected to each section of the swivel, and thereby prevent the entanglen ment of the cord.
Referring to the drawings, more especially Figure l, ldenotes an electric fixture cornprising a drop cord and the usual drop light or bulb 2. The drop cord comprises the two sections 3 and 4, the latter carrying the drop light or bulb, the former depending from the ceiling or other suitable location. The two sections of the drop cord are connected by the improved swivel 5, which consists obli the two sections 6 and 7. These sections are constructed of any suitable insulating-material, preferably porcelain or the like, and cast s or formed in the section 6 are conductors 8 and 9 provided with sockets l0 and 11, designed to receive plugs .or terminals (not shown) to be carried by the two wires 12 and 13, which are encased in the section 3 of the drop cord. Suitable set screws 14 and 15 are threaded transversely of the section 6 of the swivel and through the portions of the walls of the conductors 8 and 9, partly adjacent to and into the vsockets 10 and 11. The heads of the set screwsY are countersunk in the section 6, while the ends of the Shanks of the set screws are designed to bear against the plugs (not shown) carried by the wire 122 and 13, for the purpose of securing CTI ` (not shown) carried by the-wires orleads the plugs in the sockets and insuring proper electrical connections.
` Formed or encased in the section 7 are conductors 16 and 17, likewise provided'with sockets`18 and 19, for the reception of plugs `17 extends through the extension 25 and terminates in a flat contact head 26. The conductor 16 terminates in a iat. circular contact ring 27, which lies against the ,face 28 of the porcelain'section 7.
The conductors 8 and 9 have sockets 29 and 30 for the reception of contact pins 31 and 32. Upon inspection of Figure 2 of the draw-l ing it will be noted that the conductor 9 terminates inthe bottom of th socket 24, therefore the nose of the contac pin 32 projects into the socket 24 and is in axialalignment with the conductor 17 I 'u The socket 29 of the conductor 8 aligns axially with the center of the conductor 16, and its nose protrudes in order to ride against the face of the contact ring 27. Suitable coil expansion'springs 33 and 34 are mounted in Athe sockets 29 and 30 to insure a yieldinglaction for the pins, the contact pin`32 engaging with the Contact head of the conductor 17.
Obviously, as long as the two adjacent ends ofthe sections 6 and 7 of the swivel are positioned as shownin Figure 2 to enable' the pins 31 and 32'to contact with the ring and the head, electrical connections between the conductors in the two sections of the drop cord are aii'orded. Furthermore, the two sections of the swivel are permitted to have freedom, oi movement swivelly.
To insure the swivel action the two sections 6 and 7 have shoulders 35 and 36 provided with runways 37 and 38, which are engaged by,Y anti-frictional ball bearings 39 and 40. These ball bearin s are carried in conve tional retaining rings 41 and 42. For t e purpose of holding, the retaining rings 41 and 42 in Aposition carrying the anti-frictional ball bearings, suitable sleeves 43 and 44 are provided. -These sleeves telescope the adjacent end portions of the-two sections 6 and 7 of the swivel, and have annular flanges 45 and 46 which engage with and retain the rings' 41 and'42 in position. The sleeves 43 and 44 are threaded together as indicated at 47 Obviously, the two sections 6 and7 are capable of swivel movement relative to each other,
there still remaining electrical connections at all times between the conductors 8 and 9, an 16 and 17.
Referring to Figure 6 it will be noted that the yieldable contact pins 31 and 32 are elimi- -nated and in lieu thereof` the. conductors 8' and 9a have contact heads 8b and 8c, which engage with the contact ring 27 of the section 7 of the swivel and the contact head 26 of the conductor 17 of the .section 7 ofthe swivel respectively. In Figure 6 the contact ring 27 is carried by the conductor 16. These contacts and conductors aord electrical connections between the wires 12 and 13, and 20 and 21 as shown in Figure 1.
In order to afford yieldable pressure between the contacts and yieldable action for the sections 6 and 7, expansion coil springs 50 and 51 are interposed between the ball bear.A
ing retaining rings 41 and 42 (which are reversed in position to those in Figure 2) and theshoulders 37a and 38a. In this instance the ball bearings engage with the flanges 45 and 46 of the sleeves.
`Referring to Figure 10 it is to be noted that the adjacent faces of the two sections of the swivel may beprovided with three contact rings 52, 53 and 54, which together with the central contact head, there may be four electrical connections aorded. In this manner most any number oftelectrical connections may be made. When using the four contact rings, they are connected to the conductorsl 55, 56 and 57, Vshown in dotted lines in Figure 10.
Referring to Figure 8 it will be noted that the swivel is adapted for use in connection with a screw plug, while in Figure 9 the swivel is1 adapted to use in connection with a. push p ug. f
The invention having been set orth, what is claimed is Y 1. In a swivel for two sections of a drop cord, the combination with two insulating sections, one socketed within the other, of means including anti-frictional elements for swivelly uniting the two insulating sections said means permitting movement of said sections towardand from each other, electrical conductors encased within the insulating sections, certain of said conductors provided with a stationaryncontact ring anda stationllO ary head, other of said electrical conductors provided with movable contacts, one-engaging with the contactring and`the other engaging with` the contact head.
2. In a swivel for two sections of a drop said insulating sections ,having shoulders, thesleeves having abutment shoulders, anti-fricf tional n'ieans between the two sets of shoulders, electrical conductors encased within the insulating sections, certain of said conductors provided with a stationary contact ring and a stationary head, other of said conduct-ors provided with movable contacts, one engaging with the contact ring and the other engaging with the contact head, the remote ends of the conductors having sockets, and means passing through the insulating sections and 10 partially into the sockets for holding plugs in the socketsl and retaining the conductors in position in the insulating sections.
In testimony whereof I aiiix my signature.
ELDON W. BALDWIN.