MEMBER FOR CONTROL OF PRELIMINARILY TENSION OF THREADED ANCHOR Russian patent published in 1998 - IPC

FIELD: mechanical engineering. SUBSTANCE: member has internal shape-stable clamping ring and external stretching ring. Being tightened the female screw produces a preliminarily axis tension. This tension leads to the expansion of the external stretching ring by means of the inside shape-stable clamping ring. The tension lasts until female screw does not reach the external stretching ring. The required preliminarily tension is achieved at this final position. That the female screw is abut against the internal stretching ring can be checked visually allows the indirect verification of the preliminarily tension. EFFECT: simplified control of the preliminarily tension. 6 cl, 8 dwg