Abstract: A floating, self-propelling, self-ballasting, pivotable bridge system is described. The bridge has a main bridge body with a pontoon-like structure. One end of the bridge has a pivoting system comprising complementary pivot plates, one attached to the bridge and the other on land with a pivot pin attaching them at a pivot point. The other end of the bridge has a releasable locking mechanism. The bridge has ballast tanks for raising and lowering its level in the water. The bridge also has thrusters for propelling itself through the water when it pivots from a closed position spanning a waterway to an open position allowing boat traffic through a waterway.

Abstract: An articulating cage configured to raise and lower with respect to a fixed structure. The articulating cage comprises support structures affixed to the fixed structure and that include one or more springs. The articulating cage includes lifting arms that are pivotally connected to the support structures at one end and to a cage portion at the other end. A load chain connects to the springs at one end and to the lifting arm at the other near to the location where the lifting arm connects to the cage portion.

Abstract: The swing bridge for the spanning of watercourses, defined by a first bank and by a second bank on which there are tracts of road surface, is constituted by a first mobile plane restable, at its first end on the said first bank and is supported, at its other end in proximity to the said second bank with possibility of free rotation about its vertical axis passing through its own longitudinal axis of symmetry and defined by a vertical hinge pivot; the second end of the said mobile plane being hinged about its horizontal transversal axis to the said hinge pivot and having hinged to itself a connecting plane of the mobile plane with the second bank; between the mobile plane and the connecting plane there being envisaged movement organs of the said connecting plane and the mobile plane bearing inferiorly at least one floating hollow body with adjustable trim which raises or lowers the said first end and nautical propulsion organs which move the said mobile plane in rotation about the said hinge pivot after the sa