Patent ID: 6779957
Filing Date: 2004-08-24
Classification: B62D,F16B

Abstract:
A bolt comprising:a bolt body having a bolt head and a bolt shank extending from the bolt head; and a cylindrically shaped collar bolt surrounding the bolt shank and having a cylindrical outer peripheral surface with external thread and a cylindrical inner peripheral surface with internal thread; wherein the bolt shank comprises an external thread portion with external thread and a small-diameter portion formed between the bolt head and the external thread portion; wherein the small-diameter portion has a smaller diameter than a minor diameter of the external thread formed on the external thread portion; wherein the external thread formed on the external thread portion of the bolt shank is adapted to thread into the internal thread formed on the inner peripheral surface of the collar bolt so that engagement between the external thread formed on the external thread portion of the bolt shank and the internal thread formed on the inner peripheral surface of the collar bolt is canceled by a torque which is not less than a predetermined value; and wherein when the engagement between the external thread formed on the external thread portion of the bolt shank and the internal thread formed on the inner peripheral surface of the collar bolt is canceled, a clearance is produced between the collar bolt and the small-diameter portion of the bolt shank to permit the bolt shank to move radially relative to the collar bolt.