Patent ID: 7021192

Claim:
A cylinder apparatus comprising a cylinder body having a cylinder chamber defined therein, a cover member that closes said cylinder chamber, a piston installed in said cylinder body which is displaceable in an axial direction in said cylinder chamber, a port provided in said cover member for supplying and discharging a pressure fluid, and a cushion mechanism which adjusts a displacement speed around an end of displacement of said piston, wherein said cushion mechanism comprises: a bypass passage which communicates with said port and said cylinder chamber; an adjusting member which is displaceably screwed within said cylinder apparatus and which has an engaging projection; and a rotatable member having an engaging recess, which is rotatably installed within said cylinder apparatus, and which is prevented from displacement in a direction substantially perpendicular to an axis of said cylinder body, wherein said engaging recess of said rotatable member engages with said engaging projection of said adjusting member when said rotatable member is rotated, said adjusting member faces said bypass passage, and a flow rate of said pressure fluid flowing through said bypass passage is adjusted when said adjusting member only is displaced in said direction substantially perpendicular to said axis of said cylinder body, wherein said rotatable member has a columnar holding section, and a flange section which is formed under said holding section and which is expanded radially outwardly, and wherein a stopper ring, which prevents displacement of said rotatable member, is installed in said holding section by a ring-shaped covering member.