公开(公告)号：JPH07144269A

公开(公告)日：1995-06-06

申请号：JP12088794

申请日：1994-06-02

Applicant: EMHART INC

Inventor： HIYUU RAFUAATEII

IPC: E04C5/12 ,  B21K1/74 ,  B22D25/02 ,  F16B13/06

Abstract: PURPOSE: To easily manufacture a sleeve for an anchor bolt by forming a cylindrical collar having segments extending radially outwards, and bending the segments until they come to a position where they form a cylinder. CONSTITUTION: A blank 2 comprising a cylindrical collar 4 having a number of segments 8 extending radially outwards is formed. The blank 2 is a simple split type and is easily formed by casting, press forming, or forging. The segment 8 is bent around the shaft of the collar 4 unit it comes to an assembly position with a cylindrical shape and becomes a sleeve of an anchor bolt. The sleeve is inserted into a bolt with a multi-head and a nut is fixed. Then the head is introduced into the sleeve and the segments are expanded. The anchor bolt is inserted into a hole which is to be fixed and the nut is tightened, then the segments 8 are fixed to the hole and the anchor bolt becomes a strong one.