IMPROVEMENTS IN MULTI-STUD TENSIONERS

摘要

A multi-stud tensioner (17) comprises a circular carousel ring (18) with bores (20) corresponding in number to the number of studs (12) to be tensioned. A tension bar (21) has a socket (22) which screws onto an extension (16) of the stud. The tension bar can turn in a thrust block (41) which can be raised by means of a hydraulic tensioning device (44). The reaction is transmitted to the workpiece (11) by the carousel ring (18). A motor (50) tightens the working nut (14) by means of a chain driven dog ring (54) with spring-load driving dogs (55).