Patent ID: 7195439
Filing Date: 2007-03-27
Classification: F16B,Y10S

Abstract:
1. A tightening member which is fitted around a first end of an elongated fixing means defining a longitudinal direction, and extending through an element to be joined, the tightening member comprising: a first part which is fixed around the first end of the elongated fixing means in a manner which transmits tightening force, the first part having portions forming a front surface, which faces toward the second end of the elongated fixing means, and defining an outer diameter; a second part, a portion of the second part forming a second front surface of the tightening member adapted for abutment to the element to be joined, the second part being placed around the first end of the elongated fixing means, separate from the elongated fixing means, and between the first part and the element to be joined; a pressurized medium chamber formed between the first part and the second part; a locking part effective between the first part and the second part, the locking part having an annular shape defining an inner surface and positioned around the first end of the elongated fixing means and positioned between the first part and the element to be joined, and lockably connected to the second part by said inner surface, and the locking part having a surface transverse to the longitudinal direction of the elongated fixing means, engageable when in a locking position, in abutment with the front surface of the first part; wherein the second part has portions forming a first rearward surface facing toward the first end of the elongated fixing means, and having an outer wall defining an outer diameter and an inner wall defining an inner diameter, said first rearward surface of the second part being positioned in an annular recess formed in the first part, the recess having an inner wall, an outer wall, and a bottom, whereby the pressurized medium chamber is formed between said first rearward surface of the second part and the bottom of the recess; and wherein the outer diameter of the second part is smaller than the outer diameter of the first part, and wherein the locking part is lockable to the second part, said second part having a butt end proximate said element to be joined, wherein the butt end narrows inwardly forming a recess in which the locking part is placed with the locking part inner surface in direct engagement with the second part.