Sharp Kabushiki Kaisha Corporation

Nec Tokin Corporation

Tokin Corporation

Tokai University Educational System

Union Seimitsu Co., Ltd.

Hideo Takaara

Kiyoshi Yamauchi

Kazuo Sugiyama

Masanobu Tanigawa

Kazunari Yoshida

Shoichi Sato

Tadashi Tashima

Yoshio Shindoh

Yu Kagami

A screw attachment (&#x2033;) disposed around a fastening piece () secured to a main fastening body (), the screw attachment sandwiched between a head () of the fastening piece and a securing object () so that the screw attachment bears a securing force of the fastening piece to press the securing object. The screw attachment includes a pair of arms () made of a shape restoring material. Each arm has a fore end, and the fore ends are joined to each other with an adhesive material that is softened when heated. The arms expands radially such that the screw attachment is released from the head of the fastening piece when heat or force is applied to the arms.

Screw attachment, fastening assembly having screw attachment, and process of releasing fastening assembly

A shape memory alloy consisting, by atomic ratio, of V 0.25-2.0% and the balance of Ni and Ti, an atomic ratio of Ni and Ti being 0.96-1.06. The shape memory alloy has a good workability and a reduced temperature difference between a martensitic transition start point and an austenitic transition finish point. When the atomic ration of Ni/Ti is 0.96-1.02, the martensitic transition start point is the room temperature or higher. When the atomic ratio of Ni/Ti is 1.02-1.06, the martensitic transition start point is the room temperature or lower. The shape memory alloy has a pseudo elasticity.

Ti-Ni-V shape memory alloy

Growing community of inventors

Miyagi, Japan

Hideo Takaara