Transmission of electric current between relatively movable conductor members

Claim 1

AN ELECTRICAL LIQUID BRUSH DEVICE COMPRISING INNER AND OUTER CONCENTRIC CONDUCTOR MEMBERS ROTATABLE RELATIVELY TO EACH OTHER AND HAVING RESPECTIVE CURRENT COMMUNICATING FACES PRESENTED RADIALLY OUTWARDLY AND RADIALLY INWARDLY, BOTH SAID FACES BEING CONTINUOUS CIRCUMFERENTIALLY OF SAID MEMBERS AND DEFINING A GAP THEREBETWEEN, A QUANTITY OF ELECTRICALLY CONDUCTIVE LIQUID IN SAID GAP, AT LEAST ONE ROTATABLE CONDUCTOR SHELL DISPOSED IN SAID GAP AND SUB-DIVIDING SAME IN THE DIRECTION OF ITS THICKNESS SAID SHELL BEING ADAPTED TO ROTATE IN OPERATION OF SAID DEVICE IN CONTACT WITH SAID LIQUID BUT IN SPACED RELATION TO EACH OF SAID CURRENT COMMUNICATING FACES, AND AT A SPEED RELATIVELY TO EACH OF SAID CONDUCTOR MEMBERS LOWER THAN THAT OBTAINING AS BETWEEN SAID CONDUCTOR MEMBERS AND A STOP MEMBER OF MATERIAL HAVING A LOW COEFFICIENT OF FRICTION IN RELATION TO THE MATERIAL OF WHICH SAID SHELL IS FORMED AND DISPOSED AT ONE END AT LEAST OF SAID GAP TO PREVENT AXIAL DISPLACEMENT OF SAID SHELL THEREFROM.