| 摘要 |
PROBLEM TO BE SOLVED: To improve reliability of a connection keeping part having a function to facilitate dismantlement in the case of disposing of products by utilizing deformation caused by a shape-memory effect. SOLUTION: A male screw thread and an annular groove are provided in an external peripheral surface of a pipy member made of a shape-memory material and having a circle form in normal use and a pentagram in a shape- recovery state in a cross-section perpendicular to a longitudinal direction of the pipy member by utilizing the characteristic that the total length of sides constituting a pentagram is longer than the length of the circumference of a circle passing apexes of the pentagram. A structure thus made up is defined as the connection keeping part. When members are connected together, the male screw thread is screwed into a nut and an annular member is fitted into the annular groove. Connection dissociation is achieved through a decrease in an outer diameter of the connection keeping part resultant from a change of a cross-sectional shape from the circle form into the pentagram caused by a shape recovery. COPYRIGHT: (C)2003,JPO
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