Patent ID: 6095733
Filing Date: 2000-08-01
Classification: F16B

Abstract:
A threaded fastener system for securing a plurality of workpieces together said system comprising:a bolt and a nut assembly, said bolt having an elongated shank adapted to be located in aligned openings in workpieces to be secured together with said shank having a threaded portion at its outer end,said nut assembly including a nut member and a lock base member,said nut member having a threaded through bore adapted to threadably engage the threads of said threaded portion of said bolt shank,said nut member having an enlarged counter-bore at its inner end,said lock base member having a load ring with a reduced diameter boss extending axially from the outer end of said load ring,said lock base member having a through bore extending through said load ring and said boss and adapted to receive said bolt shank in a clearance relationship,said lock base member assembled to said nut member with said boss located in said counterbore,said nut member adapted to be threaded onto said threaded portion of said bolt shank with said load ring engaging the confronting surface of the adjacent workpiece and with the resultant axial clamp load being applied to the workpieces from said nut member to said load ring substantially through column loading of said boss as a result of the relative axial force developed between said bolt and said nut member by torque applied between said nut member and said bolt,said boss adapted to collapse at a preselected magnitude of axial load resulting from the torque applied between said nut member and said bolt,said boss constructed such that upon its collapse the material of said boss will be directed radially inwardly into compressive engagement with the threads of said threaded portion whereby said bolt and nut assembly are locked together under a prevailing torque type lock with substantially no distortion of the material of said nut member radially into engagement with the threads of said threaded portion of said bolt.