| 摘要 |
The orientatable blocking unit for the support of structures on cylindrical elements is composed of a lower annular body, secured to the structure, in which the lower body there is present an upper annular body, coaxial with it in at-rest conditions, secured to an intermediate annular body by means of a pair of aligned, radial pins, which intermediate body is, in turn, secured to the lower annular body by means of a second pair of aligned, radial pins, perpendicular to the first pair. This permits, in operating conditions, the free orientation of the axis of the upper body with respect to that of the lower body. The upper body possesses an internal surface on which there are present a plurality of upwardly converging slide seats, in which there are slidably supported movable jaws, equipped internally with members for coupling by friction to a tubular column. Elastic members effect translatory movement of the jaws from a lowered, unblocking position to a raised, blocking position, radially gripping the column. The jaws can be retained in the unblocking position.
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