Patent ID: 8328491
Filing Date: 2012-12-11
Classification: B25B,F16B

Abstract:
1. An expanding spacer, to be mounted about a bolt being tensioned, incorporating a nut engageable with the bolt, and a rotatable spacer ring with a planar end face engageable with a component to be clamped, the nut and the rotatable spacer ring having complementary helically ramped faces terminated by abutment faces, and holes in the rotatable spacer ring for engagement by a tool to selectively rotate the spacer ring to an expanded position having the complementary helically ramped faces engaged in expanded positions, wherein the bolt is being tensioned and wherein the angle of inclination of each of the ramped faces to the planar end face of the rotatable spacer ring is selected so there will be no relative rotation or motion between the nut and the rotatable spacer ring while the expanding spacer is subject to an applied compressive load.