Patent ID: 7140824

Claim:
A hydraulic tensioner for use in a high tensile force environment where space is limited, said tensioner applying tension to a studbolt extending from an article, said tensioner comprising: a puller bar having a threaded end for threaded engagement with a threaded end of the studbolt; hydraulic means for exerting a pulling force on the puller bar and thus the studbolt to apply tension to the studbolt; a cone nut assembly for fitment to the studbolt in a position adjacent the article, said cone nut assembly comprising a nut body for threaded engagement on said studbolt and having a downwardly and inwardly substantially conical or tapered peripheral outer surface, and an outer annular collar radially surrounding said nut body with a complementary conical or tapered recess to receive most of the nut body, in use; and a bridge for extending around and over the nut body, operable to react between the hydraulic means and the article to tension the studbolt by a pulling force exerted by said hydraulic means on said puller bar to pull said end of the studbolt in a direction away from the article, said nut body being adjustable on the studbolt and against the tapered recess in the outer annular collar to take up elongation of the studbolt as a result of applying tension to it; wherein, said bridge stands directly upon said outer annular collar in operation.