| 摘要 |
PURPOSE:To prevent a shaft from being drawn out by always obtaining agree able pawing, by forming a shape storing alloy plate to a cylindrical shape or a spiral cylindrical shape at a temperatue of a transformation point or below, fitting it to a shaft hole of a hinge, and thereafter, making it contact closely the inside surface of the shaft hole by a suitable pressure at a temperature of the transformation point or above. CONSTITUTION:In shape memory alloy material, a plate material whose transformation temperature is as low as possible is formed to a cylindrical shape whose both sides are butted or a spiral cylindrical shape whose both sides are polymerized partially, at the temperature of a transformation temperature or below, it iis fitted into a shaft hole of a hinge frame whose inside surface is finished smoothly, and thereafter, it is formed by restoring it to a shape which contacts closely the inside surface of the shaft hole by a suitable pressure. In such a way, the shaft can be fitted easily, and after it is fitted, a temple can be erected and laid down for a long period of time by a set pressure, and a drop of pawing caused by wear of a frictional surface, unsteadiness of the hinge, etc. can also be prevented.
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