Vorrichtung zur Ausbildung einer Verbindung

摘要

A joint forming device for forming a joint between two members, the device (10) comprising a tightening element (12) to be fitted to one member and a fastening element (14) having a longitudinal axis (34) to be fitted to the other member. The fastening element has at least one engaging surface (26) cooperably engageable with a respective arcuate camming surface (24) of the tightening element whereby rotation of the tightening element in one sense about an axis of rotation thereof causes axial movement of the fastening element towards the axis of rotation to cause a joint formed between the two members to tighten. The or each arcuate camming surface (24) is adapted such that the relation between the amount of rotation of the tightening element and the amount of axial movement it causes is substantially constant substantially throughout the range of axial movement of the tightening element. The device further comprises formations (84, 86) for resisting rotation of the tightening element about its axis of rotation at least in the sense opposite to the sense in which it is rotated to cause tightening of the joint.