Patent ID: 8960074
Filing Date: 2015-02-24
Classification: F15B,Y10T

Abstract:
1. A fixing method for fixing a cap in a fluid pressure device including a body having a chamber therein into which a pressure fluid flows, to seal an open end portion of the chamber, the open end portion communicating the chamber with a region exterior to the body, comprising the steps of: locating in an interior of the chamber a plate body having an arcuate portion exhibiting a concavity defined by the arcuate portion, the concavity facing toward the open end portion, the plate body having a cross sectional area that is equal to or less than a cross sectional area of the chamber; and gripping both sides of the plate body along an axial direction inside the chamber while pressing both sides of the plate body and causing the plate body to plastically expand in diameter at least in a radial outward direction sufficiently to bite into the wall of the body having the chamber therein, wherein the step of gripping both sides of the plate body is performed so as to cause the arcuate portion of the plate body to be plastically deformed to become planar in shape.