A bidirectional pivoting joint comprises pivoting elements which are rotatable relative to one another, specifically in a coaxial arrangement, a cylindrical outer body and a cylindrical inner body and a locking device optionally locking and releasing the rotational movement. The locking device has an annular space between the outer body and the inner body. Provided between annular space surfaces, specifically an inner surface of the outer body and an outer surface of the inner body are radially narrowing and, on the other hand, radially wider, peripheral regions in alternating arrangement. Arranged in the annular space are at least two clamping members which are each adjustable in cross-section in the peripheral direction (u) of the annular space. In a holding state, each clamping member has a first said cross-section and lies in the narrowing peripheral regions against the outer body and the inner body. By this means, a self-holding clamping connection is established which blocks the relative rotational movement between the outer body and the inner body in each rotation direction (d). In a releasing state, each clamping member has a second said cross-section by means of which the clamping connection is released in order to free the rotational movement. An actuating device of the pivoting joint is equipped with an actuating means which acts on the clamping members to establish, firstly, the holding state and, secondly, the releasing state. A holding and positioning device comprises a plurality of said pivoting joints.
