| 摘要 |
PROBLEM TO BE SOLVED: To keep the shape of an expansion/contraction member when expanded at a stable predetermined shape even when the unevenness of a material and thickness exists in the expansion/contraction member. SOLUTION: When an extension ratio for maximizing the internal pressure p of a locking balloon 44 is 1.5, a pressure control part 32 defines an area where the extension ratioλof the locking balloon 44 is≤1.5 as a using range. An expansion range control part 32b reads air feed flow rate information prestored beforehand in relation with expansion range information which is the information of the using range from an expansion range storage part 32a, and the expansion of the locking balloon 44 is flow-rate-controlled by the air feed flow rate information. COPYRIGHT: (C)2011,JPO&INPIT
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