Patent ID: 7074044

Claim:
An electrical swivel coupling comprising an inner wiper contact ring arrangement ( 2 ) and an outer wiper ring arrangement ( 3 ) for transmitting electrical current; wherein said inner wiper contact ring arrangement ( 2 ) comprises a plurality of first wiper rings (a), which have respective first lugs ( 7 ) leading outward to one side in an axial direction ( 6 ); wherein said outer wiper contact ring arrangement ( 3 ) comprises a plurality of second wiper rings ( 5 ), which have respective second lugs ( 8 ) leading outward to an opposite side in another axial direction ( 9 ) opposite from said axial direction ( 6 ), said second wiper rings ( 5 ) being provided with a plurality of spring contacts ( 10 ) formed by recesses and deformations provided in said second wiper rings ( 5 ), so that said spring contacts of said second wiper rings ( 5 ) are in electrical contact with an outer wiper ring surface ( 18 ) of said first wiper rings ( 4 ) arranged coaxially in relation to said second wiper rings; wherein each of said first wiper rings ( 4 ) is in one piece with an associated one of said first lugs ( 7 ) connected therewith and each of said second wiper rings is in one piece with an associated one of said second lugs ( 8 ) connected therewith; wherein each of the first wiper rings and the associated one of the first lugs together have a T-shape and each of the second wiper rings and the associated one of the second lugs together have a T-shape in respective developed forms prior to connecting opposite ends of wiper surfaces of said wiper rings to form said wiper rings; and wherein the first wiper rings and the second wiper rings have corresponding tongue-and-groove connections ( 11 ) connecting the opposite ends of said respective wiper ring surfaces.