Patent ID: 7836816

Claim:
A retaining ring for use in a fluid pressure cylinder, the retaining ring being disposed in said fluid pressure cylinder in which a piston, which is installed in a cylinder body having a cross sectionally elliptically shaped cylinder chamber, is displaced by a pressure fluid, said retaining ring fixing a cover member that is installed into an end of said cylinder body, said retaining ring comprising: a bent section installed on an inner wall surface of said cylinder chamber and which is bent along the inner wall surface of said cylinder chamber; a pair of straight sections extending from both ends of said bent section and arranged substantially in parallel with each other; and a pair of bulging portions disposed on said straight sections and having holes into which a machine tool may be inserted; a pair of arcuate sections provided on ends of said straight sections, said arcuate sections being formed with substantially the same radius of curvature as said bent section and bent in directions to mutually approach one another, and wherein said bent section and said arcuate sections are disposed in confronting relation to each other while sandwiching said straight sections therebetween, wherein said bent section and said straight sections are deformed and separated away from said inner wall surface by the machine tool, which is inserted into said holes.