STUD TENSIONING DEVICE FOR FLANGE COVER

摘要

A mechanism (1) for selectively securing a cover (14) to a flange (12) of a pressure vessel. A plurality of such devices can be employed, using a plurality of studs (10) that extend through matching openings in the flange (12) and cover (14). A movable anchor plate (18) or plates, also with holes (20) through which each stud (10) extends, is disposed adjacent to the flang e (12) or cover (14). The head of each stud (10) will fit through its associat ed hole (20) of the anchor plate (18) (and into the opening of the closer one o f the flange (12) or cover (14)) only if the anchor plate (18) is properly oriented. When the anchor plate (10) is so oriented, a piston head (10a) at the opposite end of the stud (10) can be actuated away from the flange (12) and cover (14) to retract the stud head (42) into the opening (20) of the flange (12) or cover (14). This protects the stud (10) when the cover is disengaged from the flange (12). The stud (10) can be biased in the opposite direction to permit the anchor plate (18) to be reoriented into a position i n which the stud head (42) cannot pass through the anchor plate (18), so the stud (10) can clamp the flange (12) and cover (14) together.