公开(公告)号：JPH08219129A

公开(公告)日：1996-08-27

申请号：JP32297095

申请日：1995-12-12

Applicant: EMHART INC

Inventor： DANIERU ROBIN SUMISU ,  DONARUDO UIRIAMU AAMUSUTORONGU

IPC: F16B19/10

Abstract: PROBLEM TO BE SOLVED: To heighten locking performance of a mandrel and to improve noise mubbing performance and removal of a broken piece by tapering the inner surface of one end of a sleeve, providing the mandrel with a head part and a breaking neck, and providing the head part with a reduced-diameter part. SOLUTION: One end 20 of a sleeve 21 has an inner surface taper 22, and one end 23 of a mandrel 24 is provided with an enlarged-diameter head 25 and a breaking neck part 26. A taper 27 is provided between the breaking neck part 26 and the enlarged-diameter head, and the diameter of the mandrel is decreased toward the enlarged-diameter head 25. During fitting, the mandrel head passes the rivet sleeve unitl workpiece parts are collected, and when the fitting load is increased, not being moved outward, the rivet material below the mandrel is moved inward to fill up a clearance gap below the mandrel head. Since the mandrel head part is tapred, the remaining part of the mandrel head is efficiently locked to form resistance to push out.