US Patent 7836816 Retaining ring for fluid pressure cylinder

A cylinder tube includes a cylinder hole therein through which a piston is displaceably inserted. A head cover and a rod cover are installed respectively into ends of the cylinder hole. Locking rings, each having a bent section, a pair of arm sections that extend from both ends of the bent section, and claw sections disposed on ends of the arm sections, are disposed in the cylinder hole. In addition, the locking rings are installed respectively in the cylinder hole through ring grooves, wherein the head cover and the rod cover are fixed by means of the locking rings.