PROBLEM TO BE SOLVED: To sustain proper damping performance of a drop preventive structure for a dynamic dumper by eliminating road surface interference to a lower face of a mass member on a bad road of preventing degradation or crack of a rubber elastic body.;SOLUTION: The mass member 5 is elastically supported by support pieces 21 of a mounting bracket 2 through a rubber elastic body 4, mounting bolts 3 are inserted in large-diameter through-holes 5a vertically pierced in the mass body 5 from below, where the diameter of the mounting bolts is smaller than that of the through-holes 5a. The mounting bracket 2 and a guard bracket 6 are fixed to a mounting bracket 1 by the mounting bolts 3, a guard piece 63 of the guard bracket 6 is extensively arranged under the mass member 5, the vertical distance between upper faces of the guard pieces 63 and lower ends of mounting bolts 3 is set shorter than the vertical size of the mass member 5.;COPYRIGHT: (C)2003,JPO
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