To provide an easy unfastening screw with a stopper having a stopper function to maintain a sufficiently stable and high fastening force when fastening.
This screw has the similar structure with a current type formed by combining a first member 1 of a shape storage alloy integrally formed with a core part 3 extended in the axial direction of a screw head part 4 having a driver insert groove 6 and a second member 2 having a screw thread 5 formed from a separate material and integrally formed with a surface of the screw core part 3 by tightly bonding for fixation over from the predetermined position except a tip to a position to be brought in contact with the screw head part 4. Furthermore, a tip of the screw core part 3 of the first member 1 is provided with a nearly disk-like lock part 7 working as a stopper function by restricting displacement and deformation in the axial direction by the force from a fastening member when fastening and possible to be locked with the tip surface of the second member 2 at a dimension allowing separation from the screw core part 3 when unfastening by heating.
TANIGAWA MASANOBU
SHARP KK
Kenho Ikeda
Keisuke Yamamoto
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