Patent ID: 9500281
Filing Date: 2016-11-22
CPC Classification: F15B,F16J

Claim Text:
1. A fluid pressure cylinder comprising: a cylinder main body having a pair of ports for supplying and discharging a pressure fluid, and a cylinder chamber into which the pressure fluid is introduced from the ports; a piston having surfaces providing an installation groove formed at an outer circumferential periphery of the piston, and which piston is disposed displaceably along an axial direction in an interior of the cylinder chamber; a piston packing installed in the installation groove to provide sealing with respect to a wall of the cylinder chamber; and a cover member comprising an element separate from the piston packing and mounted on one end side of the piston, the cover member having a damper portion that absorbs shocks caused when the piston comes into abutment against the cylinder main body at a displacement end position where the piston is displaced to an end of the cylinder main body, wherein a groove part, on which the cover member is mounted, is formed on the outer circumferential surface of the piston and is disposed adjacent to the installation groove, an outer diameter of the groove part being smaller than an outer diameter of the piston, and wherein the cover member forms a portion of the surfaces comprising the installation groove, wherein the cover member includes a guide portion that guides the piston along the axial direction of the cylinder main body, the guide portion being disposed on an outer edge portion of the damper portion and installed so as to cover a part of the outer circumferential surface of the piston, and the damper portion abuts against an end surface of the piston perpendicular to a direction of displacement of the piston, and wherein the cover member further comprises a hook portion disposed on an end of the guide portion and which is folded toward an inner circumferential side of the piston with respect to the guide portion.