Patent ID: 9285010
Filing Date: 2016-03-15
CPC Classification: F16F

Claim Text:
1. A damper device comprising: a cylinder body and a piston body, arranged to apply a braking force to act on a movement or a relative movement of an object to be braked by attaching at least one of either the cylinder body or the piston body to the object to be braked, a closing portion closing the cylinder body; a protruding portion forming a flow path, communicating inside and outside of the cylinder body, and protruding outside from the closing portion of the cylinder body; a convex portion formed by the closing portion protruding inside the cylinder body; a concave portion formed by the closing portion at a side opposite to the convex portion, the concave portion having the protruding portion therein; a concave part in which the convex portion formed inside the cylinder body is housed, formed in the piston body; a plug body including a shaft portion inserted into the flow path from an outside of the cylinder body; and an urging device arranged between the closing portion and the plug body, wherein an insertion length of the shaft portion of the plug body into the flow path against urging of the urging device increases by a change in pressure due to a movement or a relative movement of the piston body in a direction separating from the closing portion of the cylinder body, a space formed between the piston body and the closing portion becomes smallest when the piston body is positioned closest to the closing portion, and a projection is formed in the plug body, the projection being located on a lateral side of a base portion of the shaft portion and abutting against a protruding end of the protruding portion when the insertion length of the shaft portion into the flow path is maximized, to thereby prevent the flow path from being closed by the plug body.