SYNCHRONOUSLY MOVABLE DOUBLE COUPLING

1535537 Universal joints; seals UNICARDAN AG 24 Sept 1976 [25 Sept 1975] 39669/76 Headings F2U and F2B A double universal joint comprises an intermediate plate member 4 constrained to move radially in a casing 1, and part-spherical surfaces 11 on the individual joint members 10 each engaging a guide surface 25 on the casing and having a centre of curvature 12 offset from the joint centre 13 by distance 14 which is the same for both joints. The plate member permits only parallel sliding of the axis 5 so that both individual joints are forced to execute the same deflection due to the camming action of the joint members 10. Lubricant is retained in the casing by seals 16. If desired, the guide surface 25 on the casing may be spherical and the seals 16 replaced by sealing boots. One or two torque transmitting balls 8 with or without a cage may be employed. Alternatively the individual joints may be of the Hooke's type each having one yoke integral with the plate member and the other yoke engaging the guide surface on the casing.