Patent ID: 8057145

Claim:
A radially expanding bolt assembly, comprising a hollow element insertable into a hole of an object, having an axis and expansible in a radial direction, said hollow element having an inner surface with at least one inner surface portion which is tapered; an expanding element insertable in said hollow element and having an outer surface with at least one outer surface portion which is tapered, cooperating with said inner tapered surface portion of said hollow element; additional elements configured for displacement of said expanding element in opposite axial directions for tightening the bolt assembly and for loosening the bolt assembly correspondingly said expanding element having two opposite ends engageable with said additional elements; and a washer positionable between the object and one of the additional elements at one of said axial ends, so that said one additional element displaces said expanding element in one axial direction and due to cooperation of said inner and outer tapered surface portions expands said hollow element to clamp it in the hole of the object, while the other additional element displaces said expanding element in an opposite axial direction and said inner and outer tapered surface portions disengage from one another so that said hollow element contracts and the radially expanding bolt assembly can be removed from the hole of said object, wherein said washer is non-rotatably connected with one axial end of said hollow element; and further comprising means for non-rotatably connecting said washer with said one axial end of said hollow element.