Frictionless service carriage system

A service carriage system comprising:

• a shaft including a first and a second helix-shaped guide in a surface of the shaft, each helix shaped-guide configured to define a linear movement along a longitudinal axis of the shaft in opposite directions and both the first and second helix shaped-guides crossing each other along the longitudinal axis of the shaft, and
• a carriage including a movable element configured to be located in and move along the first and second helix-shaped guides,
• wherein in that the movable element includes:
• at least three rolling elements configured to roll one behind the other along in successively each of the first and second helix-shaped guides, and configured such that in a crossing with the other helix-shaped guide, the at least three rolling elements have at least two contact points with the first or second helix-shaped guides, and
• a support configured to support the at least three rolling elements, wherein the support has an arcuate shape configured to position the rolling elements in at least one of the helix-shaped guides, and the support holds each of the at least three rolling elements in a fixed alignment in which each of the rolling elements is aligned along an arcuate line.