Abstract: The invention relates to a three point ball bearing arrangement which facilitates rotation in a desired direction and at the same time restricting unwanted relative lateral movement between the balls and its associated ball race. The arrangement provides for two annular surfaces enclosing the balls and on one surface of which one bearing point is provided and on the other surface of which two bearing points are provided. A tangent to the bearing point of the first annular surface intersects a straight line joining the two bearing points of the second annular surface at the axis of rotation of the arrangement.

Abstract: An improved articulated pipe coupling for connecting a stationary pipe connection to a movable pipe connection is disclosed. The pipe coupling consists of two articulated pipes which are joined together and to the pipe connections by three interchangeable ball pipe joints. These pipe joints permit the articulated pipes to rotate relative to one another. The improvement to the pipe coupling consists of a resilient tension member connected between the uppermost pipe joint and the midpoint of the upper articulated Z-shaped pipe to apply a force to the upper pipe joint for all positions of the pipe coupling. This applied force has a component which acts on the upper pipe joint in a direction opposing the weight applied to the upper joint by the weight of the pipe coupling to relieve the weight loading thereon.