Clamp for two tubular components, having a safety blocking device, and use of such clamp

Clamp for leaktight connection of two tubular components, including at least two elements having a part in the form of a portion of a ring, which are articulated to each other around a pin parallel to the axis of the ring portions, and having an internal surface for bearing on two bearing surfaces of the tubular elements for clamping them in the axial direction with the interposition of a seal and a clamping and locking device including a screw arranged transversely to the articulated elements and engaged through two bearing blocks, each of said bearing blocks including a part for bearing on a recess of one of the articulated elements and a guide journal on each side of the bearing part, which are engaged and held in a pair of openings arranged opposite each other and passing through two mutually parallel guide bars, arranged on either side of the junction parts of the articulated elements including the recesses and two nuts engaged on the screw each abutting on one bearing block, the openings of one pair of openings of the guide bars having a circular shape and the other openings having an oblong shape which is elongated along the direction of the screw, said clamp further comprising a blocking device consisting of:

• (a) a support traversed by an opening and including parts for engagement on the bars;
• (b) a lock nut rotationally mounted in the opening of the support, said lock nut having a tapped opening for screwing on one end of the screw which is situated on the oblong opening side, and a part for bearing on the nut engaged on said one end of the screw;
• (c) means for blocking the lock nut against rotation and axial translation with respect to the support;
• and
• (d) at least one blocking finger including a locking stud and a button mounted so as to pivot on the support about an axis perpendicular to the axis of the screw between a blocking position in which the locking stud is engaged in an end part of one oblong opening, and an open position, the lock nut including a bearing part for holding the blocking finger in the blocking position.