PURPOSE: To enlarge displacement at an output end in respect to an input end by pushing the input end of a vessel, increasing volume fluctuation through buckling of an input chamber inward, and discharging fluid or soft material inside the vessel from the input chamber to an output chamber.
CONSTITUTION: An inner volume of an input chamber 2d is decreased by pushing an input end 2a through output obtained by energizing a solid element 12 and compressing the input chamber 2d. Fluid medium is overflowed from the input chamber 2d to an output chamber 2e, extending the output chamber 2e to obtain an output at an output end 2b. An input displacement to the input end 2a is shown at the output end 2b while being enlarged by setting a sectional area of the output chamber 2e smaller than that of the input chamber 2d. In order to enlarge a displacement expansion ratio of the output end 2b, not only considered is a compression rate in an axial direction of the input chamber 2d at the time of pushing the input end 2a, but also a side wall 3 is extended inward, a frame which is bent inward to some extent is used for supporting the side wall, and buckled. A large displacement expansion rate is thus obtained in an easy manner.
OSADA AKIO
SASAKI AKIRA
KOIZUMI KUNIO
SASAKI AKIRA