| 摘要 |
PROBLEM TO BE SOLVED: To facilitate fixing or removal of a piston member in respect to a direct-acting rod and improve durability of the direct-acting rod.SOLUTION: This invention relates to a piston member 100 that is stored in a tube to be movable in an axial direction, present in the tube to be fixed to a direct-moving rod 10, receives fluid pressure to transmit it to the direct-moving rod 10. The piston member comprises a seal part 105a formed at an outer peripheral surface 105 opposing against the inner peripheral surface of the tube, approaching to the inner peripheral surface to restrict motion of fluid; a pressure receiving surface 101a formed in at least one of a pair of end surfaces 101 opposing to each other in an axial direction to receive fluid pressure; and an insertion hole 100a into which the direct-moving rod 10 is inserted. The insertion hole 100a is formed with a female thread part 13 engaged with a male thread part on an outer peripheral surface of the direct-moving rod.SELECTED DRAWING: Figure 1 |
