Patent ID: 11953138
Assignee: SINGLE BUOY MOORINGS INC.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC F

Claim 18:
19. The swivel stack according to claim 3, wherein in a radial direction each of the annular cavities is defined between an outward edge on one annular element selected from the group of inner annular elements and an inward edge on the outer annular element;
surfaces of the inward and outward edges being parallel to the direction of the rotation axis,
and in the direction parallel to the rotation axis each of the annular cavities is defined at the first interface between the upward facing surface of the outer annular element and the downward facing surface of the upper annular element and at the second interface between the downward facing surface of the outer annular element and the upward facing surface of the lower annular element.