PURPOSE: To elongate the life of an elastic wire rod by inserting a cylinder into a through hole in a cylinder piece and bending arcuately an end of the elastic wire rod to fit a groove provided in the cylinder.
CONSTITUTION: Since an end 11b of an elastic wire rod 11 is constructed to pinch firmly a groove 14 in a cylinder 13 inserted into a through hole 12 in a cylinder piece 8, it does not slide in this portion, but slides between the through hole 12 in the cylinder piece 8 and the cylinder 13. In this case, since a large contact area of the slide portion is used, anti-wear property is improved. Also, the end 11b and the cylinder 13 are constructed not to be easily disengaged from each other, and the reciprocating motion of the elastic wire rod 11 produced by the reciprocating motion of a partition panel 7 becomes smooth since the motion in the direction of the crankshaft 5 is regulated.
NAKANO MASAO
IZUMIYAMA HIROSHI
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