ROTATIONALLY MOVABLE TOOL FOR BOLT WITH SQUARE HOLE OR SET SCREW WITH SQUARE HOLE

摘要

PROBLEM TO BE SOLVED: To provide a rotationally movable tool for a bolt with a square hole or a set screw with a square hole, which is easier to use and more tough than a ball point type rotationally movable tool. ;SOLUTION: A rotationally movable tool has an angular column 1 at one end of a fastening holder 2 to be fitted into a square hole (a) in a bolt with a square hole or a set screw with a square hole in an engaged state. A square hole fitting body A provided at the end of the angular column 1 is curved to be approximated to all or part of a circle or an ellipse with the same curvature for the respective angular column faces to be bacically converged at one point toward the center of the top end of the angular column 1 and to be terminated at a point where a curved tangent line at the base is in parallel to the axial line of the angular column 1.;COPYRIGHT: (C)1998,JPO