Abstract: A locking gimbal ring assembly including an inner ring for holding an article and an outer clamping element for receiving the inner holding ring and connectable with an outside structure, with the outer clamping element being formed of two superimposed annular elements having each a circular half-hole provided on an adjacent end surface of each of the annular element and complementary to each other, the complementary circular half-holes forming a clamping socket, the top and bottom annular elements having at least a pair of complementary opposite holes for connecting the top and bottom annular elements together, the assembly further including a pin connectable with the inner holding ring for joint pivotal movement therewith and receivable in the clamping socket formed by the annular elements, and screws extending into the pair of complementary holes formed in the top and bottom annular elements for adjustably connecting the top and bottom annual elements.

Abstract: A swivel connector for supporting a fixture and including a swivel socket, a spherically shaped hollow member located in the socket and forming with the socket a first universal joint, and two adaptors for connecting the swivel connector to a support and the fixture, respectively, with the support-connecting adapter being connected to the swivel socket and with the fixture-connecting adaptor having a spherical portion received within the hollow swivel member and forming with the swivel member a second universal joint.